TY  - BOOK
AU  - Bakić, Gordana
AU  - Đukić, Miloš
AU  - Šijački Žeravčić, Vera
PY  - 2021
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/6383
AB  - Projektovanje i vek mašinskih konstrukcija su u direktnoj vezi sa uslovima
rada kojima su one izložene. Uslovi rada pogoduju pojavi različitih oštećenja
čije prisustvo na specifičan način menja prvobitno stanje materijala
konstrukcije. Da bi se pojava oštećenja vitalne opreme svela na najmanju
meru, neophodno je u svakom pojedinačnom slučaju odrediti delujući
mehanizam oštećenja, pojavu i širenje oštećenja, kao i stvarni uzročnik koji
to oštećenje izaziva.
Važnost ovih saznanja leži u činjenici da promene izazvane različitim
mehanizmima oštećenja dovode do promene osobina konstrukcije, tako što
se menjaju svojstva materijala i/ili geometrija, tj. poprečni presek mašinskog
dela. Usled ovakvih promena, prvobitni projektni uslovi konstrukcija više nisu
merodavni, mašinske konstrukcije gube svoju radnu sposobnost koja
vremenom opada do te mere da dolazi do otkaza koji se najčešće manifestuje
lomom ili prekomernom deformacijom dela. Zato može da se kaže da u
velikom broju slučajeva pojave oštećenja, posebno kod složenih sistema,
između teorije i prakse postoji značajan raskorak - delujući mehanizam
oštećenja je funkcija velikog broja uticajnih parametara, od kojih neki ne
mogu čak ni da budu pretpostavljeni, pa samim tim ni kontrolisani.
Stanje materijala kao i sklonost ka pojavi oštećenja u uslovima oštrih
parametara radne sredine nekog sistema ili njegovog dela, ali i mehanizmi
oštećenja koji počnu da deluju imaju ključnu ulogu i u proceni preostalog
resursa za rad datog sistema i u proceni vremena neophodne zamene
sistema/dela, čime smo zatvorili krug i ponovo došli na početak.
Gradivo u ovom udžbeniku je namenjeno studentima koji slušaju
predmet Ponašanje zavarenih spojeva u eksploataciji na Master akademskim
studijama Mašinskog fakulteta Univerziteta u Beogradu, ali i za predmete na
doktorskim studijama koji obrađuju mehanizme oštećenja i koroziju -
Ponašanje i pouzdanost materijala u eksploataciji i Кorozija materijala i
zaštita. Cilj ovog udžbenika je da se studentima ne samo približe osnove
mehanizama oštećenja mašinskih konstrukcija i efekti do kojih oni dovode,
već i da se upoznaju i nauče da prepoznaju osnovne tipove nekih vrsta
oštećenja (npr. osnovne oblike korozije, oštećenja od puzanja, zamora, itd.).
Za sve mehanizme oštećenja pored opšteg razmatranja, posebno je
analizirano kako se mehanizmi oštećenja manifestuju kod zavarenih spojeva.
Ovo je prvenstveno urađeno zbog studenata sa modula Zavarivanje i
zavarene konstrukcije na Mašinskom fakultetu, ali i zbog studenata sa drugih
modula koji godinama biraju ovaj predmet u okviru svog master programa.
Za detekciju većine oštećenja koriste se različite tehnike ispitivanja, od
kojih je studentima mašinstva najmanje poznata mikroskopija pa je stoga u
knjizi posvećena posebna pažnja osnovama mikroskopije i načinima njene
primene u otkrivanju oštećenja. S obzirom da oštećenja nastaju u
kompleksnim uslovima, u gradivu su istaknuti dominantni aspekti koji utiču na
oštećenja.
Autori od srca zahvaljuju recenzentima prof. dr Radici Prokić Cvetković i
dr Vesni Maksimović, naučnom savetniku, na uloženom trudu i korisnim
sugestijama da ova knjiga dobije konačan izgled.
Posebnu zahvalnost autori duguju laboratoriji „Tehnički centar-Inspekt“
iz Obrenovca na čelu sa direktorkom g-đom Vesnom Peruničić, dipl.inž.met.
koji su naši dugogodišnji saradnici sa kojima smo izradili veliki broja
ekspertiza, odakle i potiče najveći broj neverovatno lepih mikrofotografija
mikrostruktura, koje smo koristili u tekstu i bez kojih najveći broj obrađenih
mehanizama oštećenja i lomova ne bi mogao da budu kvalitetno ilustrovan.
Takođe, autori od srca zahvaljuju i našim dragim saradnicima Bratislavu
Rajičiću, dr Aleksandru Maslareviću, naučnom saradniku, i dr Biljani Anđelić,
redovnom profesoru u penziji, na pomoći oko izrade ovog udžbenika i što su
imali strpljenja svih ovih godina, zatim, prof. dr Draganu Cvetkoviću koji nam
je uredio naslovne strane, kao i laboratoriji „Zavod za zavarivanje“ koja nam
je ustupila neke svoje fotografije za ilustraciju.
I za kraj, treba navesti u ovom uvodnom delu - multidisciplinarnost tokom
istraživanja je preduslov da bi mogla da se pouzdano izvode analize uzroka
pojave oštećenja i lomova.
Svaku sugestiju od strane čitalaca i korisnika ovog udžbenika, u smislu
poboljšanja njegovog kvaliteta, autori će rado čuti i prihvatiti.
PB  - Univerzitet u Beogradu, Mašinski fakultet
T2  - Univerzitet u Beogradu, Mašinski fakultet
T1  - Osnovni mehanizmi oštećenja mašinskih konstrukcija
UR  - https://hdl.handle.net/21.15107/rcub_machinery_6383
ER  - 

@book{
author = "Bakić, Gordana and Đukić, Miloš and Šijački Žeravčić, Vera",
year = "2021",
abstract = "Projektovanje i vek mašinskih konstrukcija su u direktnoj vezi sa uslovima
rada kojima su one izložene. Uslovi rada pogoduju pojavi različitih oštećenja
čije prisustvo na specifičan način menja prvobitno stanje materijala
konstrukcije. Da bi se pojava oštećenja vitalne opreme svela na najmanju
meru, neophodno je u svakom pojedinačnom slučaju odrediti delujući
mehanizam oštećenja, pojavu i širenje oštećenja, kao i stvarni uzročnik koji
to oštećenje izaziva.
Važnost ovih saznanja leži u činjenici da promene izazvane različitim
mehanizmima oštećenja dovode do promene osobina konstrukcije, tako što
se menjaju svojstva materijala i/ili geometrija, tj. poprečni presek mašinskog
dela. Usled ovakvih promena, prvobitni projektni uslovi konstrukcija više nisu
merodavni, mašinske konstrukcije gube svoju radnu sposobnost koja
vremenom opada do te mere da dolazi do otkaza koji se najčešće manifestuje
lomom ili prekomernom deformacijom dela. Zato može da se kaže da u
velikom broju slučajeva pojave oštećenja, posebno kod složenih sistema,
između teorije i prakse postoji značajan raskorak - delujući mehanizam
oštećenja je funkcija velikog broja uticajnih parametara, od kojih neki ne
mogu čak ni da budu pretpostavljeni, pa samim tim ni kontrolisani.
Stanje materijala kao i sklonost ka pojavi oštećenja u uslovima oštrih
parametara radne sredine nekog sistema ili njegovog dela, ali i mehanizmi
oštećenja koji počnu da deluju imaju ključnu ulogu i u proceni preostalog
resursa za rad datog sistema i u proceni vremena neophodne zamene
sistema/dela, čime smo zatvorili krug i ponovo došli na početak.
Gradivo u ovom udžbeniku je namenjeno studentima koji slušaju
predmet Ponašanje zavarenih spojeva u eksploataciji na Master akademskim
studijama Mašinskog fakulteta Univerziteta u Beogradu, ali i za predmete na
doktorskim studijama koji obrađuju mehanizme oštećenja i koroziju -
Ponašanje i pouzdanost materijala u eksploataciji i Кorozija materijala i
zaštita. Cilj ovog udžbenika je da se studentima ne samo približe osnove
mehanizama oštećenja mašinskih konstrukcija i efekti do kojih oni dovode,
već i da se upoznaju i nauče da prepoznaju osnovne tipove nekih vrsta
oštećenja (npr. osnovne oblike korozije, oštećenja od puzanja, zamora, itd.).
Za sve mehanizme oštećenja pored opšteg razmatranja, posebno je
analizirano kako se mehanizmi oštećenja manifestuju kod zavarenih spojeva.
Ovo je prvenstveno urađeno zbog studenata sa modula Zavarivanje i
zavarene konstrukcije na Mašinskom fakultetu, ali i zbog studenata sa drugih
modula koji godinama biraju ovaj predmet u okviru svog master programa.
Za detekciju većine oštećenja koriste se različite tehnike ispitivanja, od
kojih je studentima mašinstva najmanje poznata mikroskopija pa je stoga u
knjizi posvećena posebna pažnja osnovama mikroskopije i načinima njene
primene u otkrivanju oštećenja. S obzirom da oštećenja nastaju u
kompleksnim uslovima, u gradivu su istaknuti dominantni aspekti koji utiču na
oštećenja.
Autori od srca zahvaljuju recenzentima prof. dr Radici Prokić Cvetković i
dr Vesni Maksimović, naučnom savetniku, na uloženom trudu i korisnim
sugestijama da ova knjiga dobije konačan izgled.
Posebnu zahvalnost autori duguju laboratoriji „Tehnički centar-Inspekt“
iz Obrenovca na čelu sa direktorkom g-đom Vesnom Peruničić, dipl.inž.met.
koji su naši dugogodišnji saradnici sa kojima smo izradili veliki broja
ekspertiza, odakle i potiče najveći broj neverovatno lepih mikrofotografija
mikrostruktura, koje smo koristili u tekstu i bez kojih najveći broj obrađenih
mehanizama oštećenja i lomova ne bi mogao da budu kvalitetno ilustrovan.
Takođe, autori od srca zahvaljuju i našim dragim saradnicima Bratislavu
Rajičiću, dr Aleksandru Maslareviću, naučnom saradniku, i dr Biljani Anđelić,
redovnom profesoru u penziji, na pomoći oko izrade ovog udžbenika i što su
imali strpljenja svih ovih godina, zatim, prof. dr Draganu Cvetkoviću koji nam
je uredio naslovne strane, kao i laboratoriji „Zavod za zavarivanje“ koja nam
je ustupila neke svoje fotografije za ilustraciju.
I za kraj, treba navesti u ovom uvodnom delu - multidisciplinarnost tokom
istraživanja je preduslov da bi mogla da se pouzdano izvode analize uzroka
pojave oštećenja i lomova.
Svaku sugestiju od strane čitalaca i korisnika ovog udžbenika, u smislu
poboljšanja njegovog kvaliteta, autori će rado čuti i prihvatiti.",
publisher = "Univerzitet u Beogradu, Mašinski fakultet",
journal = "Univerzitet u Beogradu, Mašinski fakultet",
title = "Osnovni mehanizmi oštećenja mašinskih konstrukcija",
url = "https://hdl.handle.net/21.15107/rcub_machinery_6383"
}

Bakić, G., Đukić, M.,& Šijački Žeravčić, V.. (2021). Osnovni mehanizmi oštećenja mašinskih konstrukcija. in Univerzitet u Beogradu, Mašinski fakultet
Univerzitet u Beogradu, Mašinski fakultet..
https://hdl.handle.net/21.15107/rcub_machinery_6383

Bakić G, Đukić M, Šijački Žeravčić V. Osnovni mehanizmi oštećenja mašinskih konstrukcija. in Univerzitet u Beogradu, Mašinski fakultet. 2021;.
https://hdl.handle.net/21.15107/rcub_machinery_6383 .

Bakić, Gordana, Đukić, Miloš, Šijački Žeravčić, Vera, "Osnovni mehanizmi oštećenja mašinskih konstrukcija" in Univerzitet u Beogradu, Mašinski fakultet (2021),
https://hdl.handle.net/21.15107/rcub_machinery_6383 .

TY  - CONF
AU  - Đukić, Miloš
AU  - Bakić, Gordana
AU  - Rajičić, Bratislav
AU  - Šijački Žeravčić, Vera
AU  - Sedmak, Aleksandar
PY  - 2018
UR  - https://2018.mse-congress.de/home/
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/5519
AB  - Hydrogen damage includes a wide range of environmental types of failure, hydrogen assisted mechanical degradation processes, and hydrogen-material interactions, including hydrogen embrittlement (HE) and material microstructural changes, caused by the presence of hydrogen in metals. Hydrogen embrittlement of iron, steel, and their alloys is extremely interesting phenomena as these materials are widely used in many industrial applications. The coexistence of different HE mechanisms and their simultaneous effects in metallic materials, including steels, is still not well documented, while recognition of the dominant mechanism, one or more, is an extremely challenging and a crucial problem [1]. The implementation of methods for evaluation, control, and prevention of hydrogen assisted mechanical degradation processes and HE in metals, as well as, development of  the future practically-applicable industrial predictive model requires that the variables relevant to the application be incorporated into the basic concept that define all necessary successive steps (5-step approach) for the industrial application [2]. The global 5-step approach in prevention of hydrogen assisted mechanical degradation processes and hydrogen embrittlement in metals for the practical industrial application consists of following steps: (1) phenomenology analysis of hydrogen related degradation (multiscale modeling and simulation of HE phenomena); (2) hydrogen sources and entry into metal/component; (3) structural integrity (SiM) model and (4) predictive maintenance (PdM) model which should provide basis for future (5) reliable and accurate HE damage prediction of different industrial components.
C3  - Materials Science and Engineering (MSE) 2018 Conference, Environmentally Assisted Cracking of High-Strength Alloys Symposium
T1  - Hydrogen Embrittlement and Prevention of Industrial Components
UR  - https://hdl.handle.net/21.15107/rcub_machinery_5519
ER  - 

@conference{
author = "Đukić, Miloš and Bakić, Gordana and Rajičić, Bratislav and Šijački Žeravčić, Vera and Sedmak, Aleksandar",
year = "2018",
abstract = "Hydrogen damage includes a wide range of environmental types of failure, hydrogen assisted mechanical degradation processes, and hydrogen-material interactions, including hydrogen embrittlement (HE) and material microstructural changes, caused by the presence of hydrogen in metals. Hydrogen embrittlement of iron, steel, and their alloys is extremely interesting phenomena as these materials are widely used in many industrial applications. The coexistence of different HE mechanisms and their simultaneous effects in metallic materials, including steels, is still not well documented, while recognition of the dominant mechanism, one or more, is an extremely challenging and a crucial problem [1]. The implementation of methods for evaluation, control, and prevention of hydrogen assisted mechanical degradation processes and HE in metals, as well as, development of  the future practically-applicable industrial predictive model requires that the variables relevant to the application be incorporated into the basic concept that define all necessary successive steps (5-step approach) for the industrial application [2]. The global 5-step approach in prevention of hydrogen assisted mechanical degradation processes and hydrogen embrittlement in metals for the practical industrial application consists of following steps: (1) phenomenology analysis of hydrogen related degradation (multiscale modeling and simulation of HE phenomena); (2) hydrogen sources and entry into metal/component; (3) structural integrity (SiM) model and (4) predictive maintenance (PdM) model which should provide basis for future (5) reliable and accurate HE damage prediction of different industrial components.",
journal = "Materials Science and Engineering (MSE) 2018 Conference, Environmentally Assisted Cracking of High-Strength Alloys Symposium",
title = "Hydrogen Embrittlement and Prevention of Industrial Components",
url = "https://hdl.handle.net/21.15107/rcub_machinery_5519"
}

Đukić, M., Bakić, G., Rajičić, B., Šijački Žeravčić, V.,& Sedmak, A.. (2018). Hydrogen Embrittlement and Prevention of Industrial Components. in Materials Science and Engineering (MSE) 2018 Conference, Environmentally Assisted Cracking of High-Strength Alloys Symposium.
https://hdl.handle.net/21.15107/rcub_machinery_5519

Đukić M, Bakić G, Rajičić B, Šijački Žeravčić V, Sedmak A. Hydrogen Embrittlement and Prevention of Industrial Components. in Materials Science and Engineering (MSE) 2018 Conference, Environmentally Assisted Cracking of High-Strength Alloys Symposium. 2018;.
https://hdl.handle.net/21.15107/rcub_machinery_5519 .

Đukić, Miloš, Bakić, Gordana, Rajičić, Bratislav, Šijački Žeravčić, Vera, Sedmak, Aleksandar, "Hydrogen Embrittlement and Prevention of Industrial Components" in Materials Science and Engineering (MSE) 2018 Conference, Environmentally Assisted Cracking of High-Strength Alloys Symposium (2018),
https://hdl.handle.net/21.15107/rcub_machinery_5519 .

TY  - CONF
AU  - Đukić, Miloš
AU  - Bakić, Gordana
AU  - Rajičić, Bratislav
AU  - Šijački Žeravčić, Vera
AU  - Sedmak, Aleksandar
AU  - Mitrović, Radivoje
AU  - Mišković, Žarko
PY  - 2018
UR  - http://www.ecf22.rs/docs/Book%20of%20Abstracts%20ECF22.pdf
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/5518
AB  - Hydrogen damage includes a wide range of environmental types of failure, hydrogen assisted mechanical degradation
processes - hydrogen embrittlement (HE), and hydrogen-material interactions, including material microstructural changes,
caused by the presence of hydrogen in metals. The connection between microstructure-based behaviors of materials and the
effects of hydrogen on its macroscopic measurable properties is of the utmost importance in order to provide a unified model
for HE in metallic materials, including steels.
The simultaneous activity and synergistic interplay of the hydrogen-enhanced localized plasticity (HELP) and hydrogenenhanced
decohesion (HEDE) mechanisms of HE (HELP+HEDE) was recently detected and confirmed trough simulations
(modeling), and also experimentally, in the case of different materials, such as low carbon steels, dual-phase steels, ultra
high strength steels, advanced high-strength steels, martensitic steels, martensitic stainless steels, nickel, and nickel-based
alloys. This complex interaction dependence between the simultaneously active micro-mechanisms of HE, degree of
mechanical properties degradation, hydrogen concentration/distribution, and temperature is particularly pronounced in the
case of industrial components that are exposed to hydrogen during operation at different temperatures and from different
sources.
This paper presents an overview about the simultaneous activity and synergistic interplay of HELP+HEDE mechanisms in
metallic materials and an in-depth study of the model based on the correlation of mechanical properties to scanning electron
microscopy fractography analysis of fracture surfaces in the presence of simultaneously active hydrogen embrittlement
micro-mechanisms (HELP+HEDE) in a low carbon steel.
C3  - 22nd European Conference on Fracture - ECF22, Loading and Environmental effects on Structural Integrity, Book of Abstracts
T1  - The synergistic interplay of the localized plasticity (HELP) and decohesion (HEDE) mechanisms of hydrogen embrittlement in steels: effects on macromechanical properties
UR  - https://hdl.handle.net/21.15107/rcub_machinery_5518
ER  - 

@conference{
author = "Đukić, Miloš and Bakić, Gordana and Rajičić, Bratislav and Šijački Žeravčić, Vera and Sedmak, Aleksandar and Mitrović, Radivoje and Mišković, Žarko",
year = "2018",
abstract = "Hydrogen damage includes a wide range of environmental types of failure, hydrogen assisted mechanical degradation
processes - hydrogen embrittlement (HE), and hydrogen-material interactions, including material microstructural changes,
caused by the presence of hydrogen in metals. The connection between microstructure-based behaviors of materials and the
effects of hydrogen on its macroscopic measurable properties is of the utmost importance in order to provide a unified model
for HE in metallic materials, including steels.
The simultaneous activity and synergistic interplay of the hydrogen-enhanced localized plasticity (HELP) and hydrogenenhanced
decohesion (HEDE) mechanisms of HE (HELP+HEDE) was recently detected and confirmed trough simulations
(modeling), and also experimentally, in the case of different materials, such as low carbon steels, dual-phase steels, ultra
high strength steels, advanced high-strength steels, martensitic steels, martensitic stainless steels, nickel, and nickel-based
alloys. This complex interaction dependence between the simultaneously active micro-mechanisms of HE, degree of
mechanical properties degradation, hydrogen concentration/distribution, and temperature is particularly pronounced in the
case of industrial components that are exposed to hydrogen during operation at different temperatures and from different
sources.
This paper presents an overview about the simultaneous activity and synergistic interplay of HELP+HEDE mechanisms in
metallic materials and an in-depth study of the model based on the correlation of mechanical properties to scanning electron
microscopy fractography analysis of fracture surfaces in the presence of simultaneously active hydrogen embrittlement
micro-mechanisms (HELP+HEDE) in a low carbon steel.",
journal = "22nd European Conference on Fracture - ECF22, Loading and Environmental effects on Structural Integrity, Book of Abstracts",
title = "The synergistic interplay of the localized plasticity (HELP) and decohesion (HEDE) mechanisms of hydrogen embrittlement in steels: effects on macromechanical properties",
url = "https://hdl.handle.net/21.15107/rcub_machinery_5518"
}

Đukić, M., Bakić, G., Rajičić, B., Šijački Žeravčić, V., Sedmak, A., Mitrović, R.,& Mišković, Ž.. (2018). The synergistic interplay of the localized plasticity (HELP) and decohesion (HEDE) mechanisms of hydrogen embrittlement in steels: effects on macromechanical properties. in 22nd European Conference on Fracture - ECF22, Loading and Environmental effects on Structural Integrity, Book of Abstracts.
https://hdl.handle.net/21.15107/rcub_machinery_5518

Đukić M, Bakić G, Rajičić B, Šijački Žeravčić V, Sedmak A, Mitrović R, Mišković Ž. The synergistic interplay of the localized plasticity (HELP) and decohesion (HEDE) mechanisms of hydrogen embrittlement in steels: effects on macromechanical properties. in 22nd European Conference on Fracture - ECF22, Loading and Environmental effects on Structural Integrity, Book of Abstracts. 2018;.
https://hdl.handle.net/21.15107/rcub_machinery_5518 .

Đukić, Miloš, Bakić, Gordana, Rajičić, Bratislav, Šijački Žeravčić, Vera, Sedmak, Aleksandar, Mitrović, Radivoje, Mišković, Žarko, "The synergistic interplay of the localized plasticity (HELP) and decohesion (HEDE) mechanisms of hydrogen embrittlement in steels: effects on macromechanical properties" in 22nd European Conference on Fracture - ECF22, Loading and Environmental effects on Structural Integrity, Book of Abstracts (2018),
https://hdl.handle.net/21.15107/rcub_machinery_5518 .

TY  - CONF
AU  - Đukić, Miloš
AU  - Bakić, Gordana
AU  - Rajičić, Bratislav
AU  - Šijački Žeravčić, Vera
AU  - Sedmak, Aleksandar
AU  - Mitrović, Radivoje
AU  - Mišković, Žarko
PY  - 2018
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/5515
AB  - The simultaneous activity and synergistic interplay of the hydrogen-enhanced localized plasticity (HELP) and hydrogenenhanced
decohesion (HEDE) mechanisms of hydrogen embrittlement (HE) was fully confirmed for the first time in low carbon
grade 20 - St.20 (or 20G, equivalent to UNS G10200, AISI 1020) steel specimens (boiler tubes) in situ enriched and embrittled by
hydrogen during boiler exploitation in a thermal power plant (TPP), and not only through lab experiment, simulation or modelling.
The proposed HELP+HEDE model of HE in low carbon steels is based on the correlation of mechanical properties to SEM
microscopy fractography analysis of fracture surfaces in the presence of simultaneous action in a cooperative manner of the
HELP and HEDE micro-mechanisms of HE depending on the local concentration of hydrogen in the investigated steel. Also, the
effect of hydrogen on the material mechanical properties and ductile to brittle fracture transition resulting from the concurrent
and synergistic (HELP+HEDE) or competing action of HELP and HEDE mechanisms of HE is discussed. The effects and
correlations between microstructure, fractographic observations (light microscopy and scanning electron microscope - SEM)
and macro-mechanical testing data (tensile testing, impact strength on instrumented Charpy machine and hardness) are also
considered. This paper also gives an overview of the application of a model for structural integrity analysis of boiler evaporator
tubes in TPP made of low carbon steel exposed during operation to a local corrosion process and multiple hydrogen assisted
degradation processes. The proposed model enables enhanced predictive maintenance of industrial component systems.
PB  - Ghent, Belgium
C3  - Third International Conference on Metals & Hydrogen, Steely Hydrogen 2018
T1  - Model of Simultaneous Action in a Cooperative Manner of Hydrogen Embrittlement Mechanisms (HELP + HEDE) in Low Carbon Steel and Their Effects on Mechanical Properties
UR  - https://hdl.handle.net/21.15107/rcub_machinery_5515
ER  - 

@conference{
author = "Đukić, Miloš and Bakić, Gordana and Rajičić, Bratislav and Šijački Žeravčić, Vera and Sedmak, Aleksandar and Mitrović, Radivoje and Mišković, Žarko",
year = "2018",
abstract = "The simultaneous activity and synergistic interplay of the hydrogen-enhanced localized plasticity (HELP) and hydrogenenhanced
decohesion (HEDE) mechanisms of hydrogen embrittlement (HE) was fully confirmed for the first time in low carbon
grade 20 - St.20 (or 20G, equivalent to UNS G10200, AISI 1020) steel specimens (boiler tubes) in situ enriched and embrittled by
hydrogen during boiler exploitation in a thermal power plant (TPP), and not only through lab experiment, simulation or modelling.
The proposed HELP+HEDE model of HE in low carbon steels is based on the correlation of mechanical properties to SEM
microscopy fractography analysis of fracture surfaces in the presence of simultaneous action in a cooperative manner of the
HELP and HEDE micro-mechanisms of HE depending on the local concentration of hydrogen in the investigated steel. Also, the
effect of hydrogen on the material mechanical properties and ductile to brittle fracture transition resulting from the concurrent
and synergistic (HELP+HEDE) or competing action of HELP and HEDE mechanisms of HE is discussed. The effects and
correlations between microstructure, fractographic observations (light microscopy and scanning electron microscope - SEM)
and macro-mechanical testing data (tensile testing, impact strength on instrumented Charpy machine and hardness) are also
considered. This paper also gives an overview of the application of a model for structural integrity analysis of boiler evaporator
tubes in TPP made of low carbon steel exposed during operation to a local corrosion process and multiple hydrogen assisted
degradation processes. The proposed model enables enhanced predictive maintenance of industrial component systems.",
publisher = "Ghent, Belgium",
journal = "Third International Conference on Metals & Hydrogen, Steely Hydrogen 2018",
title = "Model of Simultaneous Action in a Cooperative Manner of Hydrogen Embrittlement Mechanisms (HELP + HEDE) in Low Carbon Steel and Their Effects on Mechanical Properties",
url = "https://hdl.handle.net/21.15107/rcub_machinery_5515"
}

Đukić, M., Bakić, G., Rajičić, B., Šijački Žeravčić, V., Sedmak, A., Mitrović, R.,& Mišković, Ž.. (2018). Model of Simultaneous Action in a Cooperative Manner of Hydrogen Embrittlement Mechanisms (HELP + HEDE) in Low Carbon Steel and Their Effects on Mechanical Properties. in Third International Conference on Metals & Hydrogen, Steely Hydrogen 2018
Ghent, Belgium..
https://hdl.handle.net/21.15107/rcub_machinery_5515

Đukić M, Bakić G, Rajičić B, Šijački Žeravčić V, Sedmak A, Mitrović R, Mišković Ž. Model of Simultaneous Action in a Cooperative Manner of Hydrogen Embrittlement Mechanisms (HELP + HEDE) in Low Carbon Steel and Their Effects on Mechanical Properties. in Third International Conference on Metals & Hydrogen, Steely Hydrogen 2018. 2018;.
https://hdl.handle.net/21.15107/rcub_machinery_5515 .

Đukić, Miloš, Bakić, Gordana, Rajičić, Bratislav, Šijački Žeravčić, Vera, Sedmak, Aleksandar, Mitrović, Radivoje, Mišković, Žarko, "Model of Simultaneous Action in a Cooperative Manner of Hydrogen Embrittlement Mechanisms (HELP + HEDE) in Low Carbon Steel and Their Effects on Mechanical Properties" in Third International Conference on Metals & Hydrogen, Steely Hydrogen 2018 (2018),
https://hdl.handle.net/21.15107/rcub_machinery_5515 .

TY  - CONF
AU  - Đukić, Miloš
AU  - Bakić, Gordana
AU  - Šijački Žeravčić, Vera
AU  - Rajičić, Bratislav
AU  - Sedmak, Aleksandar
AU  - Mitrović, Radivoje
AU  - Mišković, Žarko
PY  - 2017
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/5017
AB  - A large number of contemporary studies about hydrogen embrittlement confirmed the multiple effects of hydrogen and activity of the different hydrogen embrittlement mechanisms in low carbon steels. However, critical evaluation and quantification of the synergy between the hydrogen-enhanced localized plasticity (HELP) and decohesion-based (HEDE) mechanisms, and their combined effect on macromechanical properties, still does not exist. This paper focuses on a structural integrity models for hydrogen embrittlement of low carbon St.20 (AISI 1020) steel in the
presence of simultaneously active hydrogen embrittlement micro-mechanisms.
PB  - International Conference on Fracture
C3  - ICF 2017 - 14th International Conference on Fracture
T1  - A structural integrity model for hydrogen embrittlement of low carbon steel and the combined effect of help and hede mechanisms on macromechanical properties
UR  - https://hdl.handle.net/21.15107/rcub_machinery_5017
ER  - 

@conference{
author = "Đukić, Miloš and Bakić, Gordana and Šijački Žeravčić, Vera and Rajičić, Bratislav and Sedmak, Aleksandar and Mitrović, Radivoje and Mišković, Žarko",
year = "2017",
abstract = "A large number of contemporary studies about hydrogen embrittlement confirmed the multiple effects of hydrogen and activity of the different hydrogen embrittlement mechanisms in low carbon steels. However, critical evaluation and quantification of the synergy between the hydrogen-enhanced localized plasticity (HELP) and decohesion-based (HEDE) mechanisms, and their combined effect on macromechanical properties, still does not exist. This paper focuses on a structural integrity models for hydrogen embrittlement of low carbon St.20 (AISI 1020) steel in the
presence of simultaneously active hydrogen embrittlement micro-mechanisms.",
publisher = "International Conference on Fracture",
journal = "ICF 2017 - 14th International Conference on Fracture",
title = "A structural integrity model for hydrogen embrittlement of low carbon steel and the combined effect of help and hede mechanisms on macromechanical properties",
url = "https://hdl.handle.net/21.15107/rcub_machinery_5017"
}

Đukić, M., Bakić, G., Šijački Žeravčić, V., Rajičić, B., Sedmak, A., Mitrović, R.,& Mišković, Ž.. (2017). A structural integrity model for hydrogen embrittlement of low carbon steel and the combined effect of help and hede mechanisms on macromechanical properties. in ICF 2017 - 14th International Conference on Fracture
International Conference on Fracture..
https://hdl.handle.net/21.15107/rcub_machinery_5017

Đukić M, Bakić G, Šijački Žeravčić V, Rajičić B, Sedmak A, Mitrović R, Mišković Ž. A structural integrity model for hydrogen embrittlement of low carbon steel and the combined effect of help and hede mechanisms on macromechanical properties. in ICF 2017 - 14th International Conference on Fracture. 2017;.
https://hdl.handle.net/21.15107/rcub_machinery_5017 .

Đukić, Miloš, Bakić, Gordana, Šijački Žeravčić, Vera, Rajičić, Bratislav, Sedmak, Aleksandar, Mitrović, Radivoje, Mišković, Žarko, "A structural integrity model for hydrogen embrittlement of low carbon steel and the combined effect of help and hede mechanisms on macromechanical properties" in ICF 2017 - 14th International Conference on Fracture (2017),
https://hdl.handle.net/21.15107/rcub_machinery_5017 .

TY  - CONF
AU  - Đukić, Miloš
AU  - Bakić, Gordana
AU  - Šijački-Žeravčić, Vera
AU  - Rajičić, Bratislav
AU  - Sedmak, Aleksandar
AU  - Mitrović, Radivoje
AU  - Mišković, Žarko
PY  - 2017
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/2683
AB  - A large number of contemporary studies about hydrogen embrittlement confirmed the multiple effects of hydrogen and activity of the different hydrogen embrittlement mechanisms in low carbon steels. However, critical evaluation and quantification of the synergy between the hydrogen-enhanced localized plasticity (HELP) and decohesion-based (HEDE) mechanisms, and their combined effect on macromechanical properties, still does not exist. This paper focuses on a structural integrity models for hydrogen embrittlement of low carbon St.20 (AISI 1020) steel in the presence of simultaneously active hydrogen embrittlement micro-mechanisms.
PB  - International Conference on Fracture
C3  - ICF 2017 - 14th International Conference on Fracture
T1  - A structural integrity model for hydrogen embrittlement of low carbon steel and the combined effect of help and hede mechanisms on macromechanical properties
EP  - 766
SP  - 765
VL  - 1
UR  - https://hdl.handle.net/21.15107/rcub_machinery_2683
ER  - 

@conference{
author = "Đukić, Miloš and Bakić, Gordana and Šijački-Žeravčić, Vera and Rajičić, Bratislav and Sedmak, Aleksandar and Mitrović, Radivoje and Mišković, Žarko",
year = "2017",
abstract = "A large number of contemporary studies about hydrogen embrittlement confirmed the multiple effects of hydrogen and activity of the different hydrogen embrittlement mechanisms in low carbon steels. However, critical evaluation and quantification of the synergy between the hydrogen-enhanced localized plasticity (HELP) and decohesion-based (HEDE) mechanisms, and their combined effect on macromechanical properties, still does not exist. This paper focuses on a structural integrity models for hydrogen embrittlement of low carbon St.20 (AISI 1020) steel in the presence of simultaneously active hydrogen embrittlement micro-mechanisms.",
publisher = "International Conference on Fracture",
journal = "ICF 2017 - 14th International Conference on Fracture",
title = "A structural integrity model for hydrogen embrittlement of low carbon steel and the combined effect of help and hede mechanisms on macromechanical properties",
pages = "766-765",
volume = "1",
url = "https://hdl.handle.net/21.15107/rcub_machinery_2683"
}

Đukić, M., Bakić, G., Šijački-Žeravčić, V., Rajičić, B., Sedmak, A., Mitrović, R.,& Mišković, Ž.. (2017). A structural integrity model for hydrogen embrittlement of low carbon steel and the combined effect of help and hede mechanisms on macromechanical properties. in ICF 2017 - 14th International Conference on Fracture
International Conference on Fracture., 1, 765-766.
https://hdl.handle.net/21.15107/rcub_machinery_2683

Đukić M, Bakić G, Šijački-Žeravčić V, Rajičić B, Sedmak A, Mitrović R, Mišković Ž. A structural integrity model for hydrogen embrittlement of low carbon steel and the combined effect of help and hede mechanisms on macromechanical properties. in ICF 2017 - 14th International Conference on Fracture. 2017;1:765-766.
https://hdl.handle.net/21.15107/rcub_machinery_2683 .

Đukić, Miloš, Bakić, Gordana, Šijački-Žeravčić, Vera, Rajičić, Bratislav, Sedmak, Aleksandar, Mitrović, Radivoje, Mišković, Žarko, "A structural integrity model for hydrogen embrittlement of low carbon steel and the combined effect of help and hede mechanisms on macromechanical properties" in ICF 2017 - 14th International Conference on Fracture, 1 (2017):765-766,
https://hdl.handle.net/21.15107/rcub_machinery_2683 .

TY  - CONF
AU  - Bakić, Gordana
AU  - Đukić, Miloš
AU  - Rajičić, Bratislav
AU  - Šijački Žeravčić, Vera
AU  - Gajić, Ivan
AU  - Prodanović, Andrej
AU  - Maslarević, Aleksandar
AU  - Milošević, Nenad
PY  - 2016
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/4433
AB  - Toplotno postojani martenzitni čelik X20CrMo12 1 je našao široku primenu na domaćim termoenergetskim (TE) postrojenjima za izradu izlaznih sekcija pregrejača cevnog sistema kotla, kao i debelozidih komponenti kao što su kolektori izlaznih pregrejača i parovodi sveže pare. Dugotrajne karakteristike ovog čelika su detaljno istraživane i najvećim delom razjašnjene i kao toplotno postojani čelik spada u klasu najkvalitetnijih čelika do sada napravljenih. Međutim, pored svih prednosti glavni nedostatak ovog čelika je njegova loša zavarljivost. Zavarivanje na licu mesta, martenzitnih čelika je uvek veliki izazov i vrlo je teško dobiti kvalitetan zavareni spoj u kratkom vremenskom periodu, koliko recimo traju nepredviđeni zastoji bloka. U ovom radu je, radi poređenja, data karakterizacija tri zavarena spoja cevi pregrejača izrađenog od čelika X20CrMoV12 1, zavarena različitim tehnologijama zavarivanja: fabrički spoj dobijen zavarivanjem varničenjem, sa srodnim dodatnim materijalom i sa austenitnim dodatnim materijalom.
C3  - International Conference "Power Plants 2016" 23rd – 26st November 2016 Zlatibor, Srbija
T1  - Karakterizacija zavarenih spojeva cevi od čelika X20CrMoV121 dobijenih različitim tehnologijama zavarivanja
UR  - https://hdl.handle.net/21.15107/rcub_machinery_4433
ER  - 

@conference{
author = "Bakić, Gordana and Đukić, Miloš and Rajičić, Bratislav and Šijački Žeravčić, Vera and Gajić, Ivan and Prodanović, Andrej and Maslarević, Aleksandar and Milošević, Nenad",
year = "2016",
abstract = "Toplotno postojani martenzitni čelik X20CrMo12 1 je našao široku primenu na domaćim termoenergetskim (TE) postrojenjima za izradu izlaznih sekcija pregrejača cevnog sistema kotla, kao i debelozidih komponenti kao što su kolektori izlaznih pregrejača i parovodi sveže pare. Dugotrajne karakteristike ovog čelika su detaljno istraživane i najvećim delom razjašnjene i kao toplotno postojani čelik spada u klasu najkvalitetnijih čelika do sada napravljenih. Međutim, pored svih prednosti glavni nedostatak ovog čelika je njegova loša zavarljivost. Zavarivanje na licu mesta, martenzitnih čelika je uvek veliki izazov i vrlo je teško dobiti kvalitetan zavareni spoj u kratkom vremenskom periodu, koliko recimo traju nepredviđeni zastoji bloka. U ovom radu je, radi poređenja, data karakterizacija tri zavarena spoja cevi pregrejača izrađenog od čelika X20CrMoV12 1, zavarena različitim tehnologijama zavarivanja: fabrički spoj dobijen zavarivanjem varničenjem, sa srodnim dodatnim materijalom i sa austenitnim dodatnim materijalom.",
journal = "International Conference "Power Plants 2016" 23rd – 26st November 2016 Zlatibor, Srbija",
title = "Karakterizacija zavarenih spojeva cevi od čelika X20CrMoV121 dobijenih različitim tehnologijama zavarivanja",
url = "https://hdl.handle.net/21.15107/rcub_machinery_4433"
}

Bakić, G., Đukić, M., Rajičić, B., Šijački Žeravčić, V., Gajić, I., Prodanović, A., Maslarević, A.,& Milošević, N.. (2016). Karakterizacija zavarenih spojeva cevi od čelika X20CrMoV121 dobijenih različitim tehnologijama zavarivanja. in International Conference "Power Plants 2016" 23rd – 26st November 2016 Zlatibor, Srbija.
https://hdl.handle.net/21.15107/rcub_machinery_4433

Bakić G, Đukić M, Rajičić B, Šijački Žeravčić V, Gajić I, Prodanović A, Maslarević A, Milošević N. Karakterizacija zavarenih spojeva cevi od čelika X20CrMoV121 dobijenih različitim tehnologijama zavarivanja. in International Conference "Power Plants 2016" 23rd – 26st November 2016 Zlatibor, Srbija. 2016;.
https://hdl.handle.net/21.15107/rcub_machinery_4433 .

Bakić, Gordana, Đukić, Miloš, Rajičić, Bratislav, Šijački Žeravčić, Vera, Gajić, Ivan, Prodanović, Andrej, Maslarević, Aleksandar, Milošević, Nenad, "Karakterizacija zavarenih spojeva cevi od čelika X20CrMoV121 dobijenih različitim tehnologijama zavarivanja" in International Conference "Power Plants 2016" 23rd – 26st November 2016 Zlatibor, Srbija (2016),
https://hdl.handle.net/21.15107/rcub_machinery_4433 .

TY  - CONF
AU  - Dimić, Aleksandar
AU  - Bakić, Gordana
AU  - Đukić, Miloš
AU  - Šijački Žeravčić, Vera
AU  - Ristivojević, Mileta
PY  - 2015
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/5019
AB  - Modified 2.25Cr1Mo steel, known as a relatively new
generation, grade T24 heat resistant steel (7CrMoVTiB10-
10), is extensively used as a material for fabrication of water
walls panels - evaporator tubes in supercritical boilers of a
new generation in thermal power plants. A special
advantage of T24 steel is low carbon content and the
optimal content of alloying element which simultaneously
provides its good weldability and heat resistance. For
elements up to 10 mm of thickness, made of T24 steel
standards not foreseen previous and subsequent post-weld
heat treatment (PWHT). However, after a series of problems
encountered with welded joints, practice has shown that
some kind of heat treatment is necessary, in order to reduce
the susceptibility to hydrogen induced stress corrosion
cracking (HISCC). This paper deals with the microstructural
characterization of both base material and welded joint of
boiler tube (dimension �����44,5x7,1 mm), made of T24 steel,
before and after PWHT. The aim of this paper is to evaluate
the effect of this type of PWHT on microstructural changes
and its possible impact on the susceptibility to cracking of
T24 welded joints.
PB  - National R&D Institute for Welding and Material Testing- ISIM Timisoara (Romania)
C3  - The 3rd IIW South-East European Welding congress, 2015.,Temisoara
T1  - Characterization of welded joint made of T24 steel (7CrMoVTiB10-10) with and without post-weld heat treatment
EP  - 189
SP  - 185
UR  - https://hdl.handle.net/21.15107/rcub_machinery_5019
ER  - 

@conference{
author = "Dimić, Aleksandar and Bakić, Gordana and Đukić, Miloš and Šijački Žeravčić, Vera and Ristivojević, Mileta",
year = "2015",
abstract = "Modified 2.25Cr1Mo steel, known as a relatively new
generation, grade T24 heat resistant steel (7CrMoVTiB10-
10), is extensively used as a material for fabrication of water
walls panels - evaporator tubes in supercritical boilers of a
new generation in thermal power plants. A special
advantage of T24 steel is low carbon content and the
optimal content of alloying element which simultaneously
provides its good weldability and heat resistance. For
elements up to 10 mm of thickness, made of T24 steel
standards not foreseen previous and subsequent post-weld
heat treatment (PWHT). However, after a series of problems
encountered with welded joints, practice has shown that
some kind of heat treatment is necessary, in order to reduce
the susceptibility to hydrogen induced stress corrosion
cracking (HISCC). This paper deals with the microstructural
characterization of both base material and welded joint of
boiler tube (dimension �����44,5x7,1 mm), made of T24 steel,
before and after PWHT. The aim of this paper is to evaluate
the effect of this type of PWHT on microstructural changes
and its possible impact on the susceptibility to cracking of
T24 welded joints.",
publisher = "National R&D Institute for Welding and Material Testing- ISIM Timisoara (Romania)",
journal = "The 3rd IIW South-East European Welding congress, 2015.,Temisoara",
title = "Characterization of welded joint made of T24 steel (7CrMoVTiB10-10) with and without post-weld heat treatment",
pages = "189-185",
url = "https://hdl.handle.net/21.15107/rcub_machinery_5019"
}

Dimić, A., Bakić, G., Đukić, M., Šijački Žeravčić, V.,& Ristivojević, M.. (2015). Characterization of welded joint made of T24 steel (7CrMoVTiB10-10) with and without post-weld heat treatment. in The 3rd IIW South-East European Welding congress, 2015.,Temisoara
National R&D Institute for Welding and Material Testing- ISIM Timisoara (Romania)., 185-189.
https://hdl.handle.net/21.15107/rcub_machinery_5019

Dimić A, Bakić G, Đukić M, Šijački Žeravčić V, Ristivojević M. Characterization of welded joint made of T24 steel (7CrMoVTiB10-10) with and without post-weld heat treatment. in The 3rd IIW South-East European Welding congress, 2015.,Temisoara. 2015;:185-189.
https://hdl.handle.net/21.15107/rcub_machinery_5019 .

Dimić, Aleksandar, Bakić, Gordana, Đukić, Miloš, Šijački Žeravčić, Vera, Ristivojević, Mileta, "Characterization of welded joint made of T24 steel (7CrMoVTiB10-10) with and without post-weld heat treatment" in The 3rd IIW South-East European Welding congress, 2015.,Temisoara (2015):185-189,
https://hdl.handle.net/21.15107/rcub_machinery_5019 .

TY  - CONF
AU  - Maslarević, Aleksandar
AU  - Bakić, Gordana
AU  - Šijački Žeravčić, Vera
AU  - Rajičić, Bratislav
AU  - Lukić, Uroš
PY  - 2015
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/4438
AB  - The parts of machines and structures are often exposed to
the action of aggressive corrosive environments, which in a
short period of time can provoke the loss of their integrity. It
is well known that for extending service life, the protection
of exposed structure zone by coating is frequently used. One
of the possible protection methods is hardfacing the stainless
steel of appropriate chemical composition and suitable
thickness on the surface of the parts that are made of
structural steel whose corrosion resistance is extremely low.
Due to a number of advantages, the plasma transferred arc
(PTA) surfacing process has found significant use in the
field of surface protection as well as surfacing buffer layers
for very different materials. The goal of this paper is to
determine the dependence of plasma arc welding process
parameters and characteristics of welded layer made of
stainless steel 316L, regarding selection of optimum process
parameters. Investigations were carried out on structural
steel S235JR which surface is hardfaced by powdered 316L
stainless steel with varying amounts of heat input. In this
investigation, heat input depended only on welding current
that was changed, while the other parameters of the process
were constant.
PB  - National R & D Institute For Welding And Material Testing - ISIM Timisoara, Romania
C3  - The 3rd South - East European Welding Congress  "Welding And Joining Technologies For A Sustainable Development And Environment", June 3-5, 2015, Timisoara, Romania
T1  - Plasma transferred arc hardfacing with 316L
DO  - 10.13140/RG.2.1.3808.1520
ER  - 

@conference{
author = "Maslarević, Aleksandar and Bakić, Gordana and Šijački Žeravčić, Vera and Rajičić, Bratislav and Lukić, Uroš",
year = "2015",
abstract = "The parts of machines and structures are often exposed to
the action of aggressive corrosive environments, which in a
short period of time can provoke the loss of their integrity. It
is well known that for extending service life, the protection
of exposed structure zone by coating is frequently used. One
of the possible protection methods is hardfacing the stainless
steel of appropriate chemical composition and suitable
thickness on the surface of the parts that are made of
structural steel whose corrosion resistance is extremely low.
Due to a number of advantages, the plasma transferred arc
(PTA) surfacing process has found significant use in the
field of surface protection as well as surfacing buffer layers
for very different materials. The goal of this paper is to
determine the dependence of plasma arc welding process
parameters and characteristics of welded layer made of
stainless steel 316L, regarding selection of optimum process
parameters. Investigations were carried out on structural
steel S235JR which surface is hardfaced by powdered 316L
stainless steel with varying amounts of heat input. In this
investigation, heat input depended only on welding current
that was changed, while the other parameters of the process
were constant.",
publisher = "National R & D Institute For Welding And Material Testing - ISIM Timisoara, Romania",
journal = "The 3rd South - East European Welding Congress  "Welding And Joining Technologies For A Sustainable Development And Environment", June 3-5, 2015, Timisoara, Romania",
title = "Plasma transferred arc hardfacing with 316L",
doi = "10.13140/RG.2.1.3808.1520"
}

Maslarević, A., Bakić, G., Šijački Žeravčić, V., Rajičić, B.,& Lukić, U.. (2015). Plasma transferred arc hardfacing with 316L. in The 3rd South - East European Welding Congress  "Welding And Joining Technologies For A Sustainable Development And Environment", June 3-5, 2015, Timisoara, Romania
National R & D Institute For Welding And Material Testing - ISIM Timisoara, Romania..
https://doi.org/10.13140/RG.2.1.3808.1520

Maslarević A, Bakić G, Šijački Žeravčić V, Rajičić B, Lukić U. Plasma transferred arc hardfacing with 316L. in The 3rd South - East European Welding Congress  "Welding And Joining Technologies For A Sustainable Development And Environment", June 3-5, 2015, Timisoara, Romania. 2015;.
doi:10.13140/RG.2.1.3808.1520 .

Maslarević, Aleksandar, Bakić, Gordana, Šijački Žeravčić, Vera, Rajičić, Bratislav, Lukić, Uroš, "Plasma transferred arc hardfacing with 316L" in The 3rd South - East European Welding Congress  "Welding And Joining Technologies For A Sustainable Development And Environment", June 3-5, 2015, Timisoara, Romania (2015),
https://doi.org/10.13140/RG.2.1.3808.1520 . .

TY  - CONF
AU  - Bakić, Gordana
AU  - Đukić, Miloš
AU  - Mitrović, Radivoje
AU  - Maslarević, Aleksandar
AU  - Mišković, Žarko
AU  - Rajičić, Bratislav
AU  - Šijački Žeravčić, Vera
PY  - 2015
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/4586
AB  - Characterization of metal degradation after prolonged
service is necessary for evaluating component
exhaustion and its remaining service capability.
Martensitic steel X20CrMoV 12.1 has
been extensively used as a material for tubing
systems and pipelines in thermal power plants.
This paper compares data provided by two imaging
techniques. Following tests were performed:
impact testing at different temperatures and characterization
of fracture surfaces of Charpy specimens
by scanning electron microscope and 3D
digital optical microscope. In this study three new
geometrical characteristics were established, as a
measure of the ductility change of material.
PB  - Faculty of Mechanical Engineering, University of Belgrade
C3  - Proceedings of TEAM 2015 / 7th International Scientific and Expert Conference of the International TEAM Society, 15/16th October 2015, Belgrade, Serbia
T1  - 3D profiling of 12Cr heat resistante steel charpy V noch fracture surface obtained at different temperatures
DO  - 10.13140/RG.2.1.2527.8481
ER  - 

@conference{
author = "Bakić, Gordana and Đukić, Miloš and Mitrović, Radivoje and Maslarević, Aleksandar and Mišković, Žarko and Rajičić, Bratislav and Šijački Žeravčić, Vera",
year = "2015",
abstract = "Characterization of metal degradation after prolonged
service is necessary for evaluating component
exhaustion and its remaining service capability.
Martensitic steel X20CrMoV 12.1 has
been extensively used as a material for tubing
systems and pipelines in thermal power plants.
This paper compares data provided by two imaging
techniques. Following tests were performed:
impact testing at different temperatures and characterization
of fracture surfaces of Charpy specimens
by scanning electron microscope and 3D
digital optical microscope. In this study three new
geometrical characteristics were established, as a
measure of the ductility change of material.",
publisher = "Faculty of Mechanical Engineering, University of Belgrade",
journal = "Proceedings of TEAM 2015 / 7th International Scientific and Expert Conference of the International TEAM Society, 15/16th October 2015, Belgrade, Serbia",
title = "3D profiling of 12Cr heat resistante steel charpy V noch fracture surface obtained at different temperatures",
doi = "10.13140/RG.2.1.2527.8481"
}

Bakić, G., Đukić, M., Mitrović, R., Maslarević, A., Mišković, Ž., Rajičić, B.,& Šijački Žeravčić, V.. (2015). 3D profiling of 12Cr heat resistante steel charpy V noch fracture surface obtained at different temperatures. in Proceedings of TEAM 2015 / 7th International Scientific and Expert Conference of the International TEAM Society, 15/16th October 2015, Belgrade, Serbia
Faculty of Mechanical Engineering, University of Belgrade..
https://doi.org/10.13140/RG.2.1.2527.8481

Bakić G, Đukić M, Mitrović R, Maslarević A, Mišković Ž, Rajičić B, Šijački Žeravčić V. 3D profiling of 12Cr heat resistante steel charpy V noch fracture surface obtained at different temperatures. in Proceedings of TEAM 2015 / 7th International Scientific and Expert Conference of the International TEAM Society, 15/16th October 2015, Belgrade, Serbia. 2015;.
doi:10.13140/RG.2.1.2527.8481 .

Bakić, Gordana, Đukić, Miloš, Mitrović, Radivoje, Maslarević, Aleksandar, Mišković, Žarko, Rajičić, Bratislav, Šijački Žeravčić, Vera, "3D profiling of 12Cr heat resistante steel charpy V noch fracture surface obtained at different temperatures" in Proceedings of TEAM 2015 / 7th International Scientific and Expert Conference of the International TEAM Society, 15/16th October 2015, Belgrade, Serbia (2015),
https://doi.org/10.13140/RG.2.1.2527.8481 . .

TY  - CONF
AU  - Bakić, Gordana
AU  - Šijački Žeravčić, Vera
AU  - Đukić, Miloš
AU  - Tucaković, Dragan
AU  - Stojiljković, Dragoslava
AU  - Rajičić, Bratislav
AU  - Stupar, Goran
PY  - 2014
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/5322
AB  - The emission of nitrogen oxides (NOx) during combustion of fossil fuels is considered as one of the major sources of environmental hazards. As a result, the limitations of concentration of nitrogen oxides in fuel gases are regulated. The implementation of low NOx burners in pulverized coal-fired boilers has led to a rise in the fireside corrosion rate of the waterwall boiler tubes in some power plants. Under normal combustion conditions, an oxidizing atmosphere helps formation of a protective oxide scale on the surface of the boiler tubes, thus impeding gaseous corrosion. However, the use of low NOx technology changes the combustion environment, resulting in the presence of reduction gases characterized by large amounts of CO and H2S. In areas of reducing atmosphere, a porous, non-protective scale is produced on the waterwalls that could leads to significant metal loss per year due to corrosion. In order to better understand the mechanisms and kinetics of the fireside corrosion, it was determined that, in addition to the type of atmosphere formed during fuel combustion, coal composition has an important role in the occurrence of fireside corrosion. The aim of this paper is to analyze the possibility of occurrence of fireside corrosion, i.e., determine the corrosion potential of domestic coals and identify possible problems that could occur during combustion using low NOx technologies.
C3  - Proceeding of International Conference "Power Plants 2014"
T1  - The possibility of fireside corrosion occurrence in domestic boilers furnaces with low NOx combustion technology
UR  - https://hdl.handle.net/21.15107/rcub_machinery_5322
ER  - 

@conference{
author = "Bakić, Gordana and Šijački Žeravčić, Vera and Đukić, Miloš and Tucaković, Dragan and Stojiljković, Dragoslava and Rajičić, Bratislav and Stupar, Goran",
year = "2014",
abstract = "The emission of nitrogen oxides (NOx) during combustion of fossil fuels is considered as one of the major sources of environmental hazards. As a result, the limitations of concentration of nitrogen oxides in fuel gases are regulated. The implementation of low NOx burners in pulverized coal-fired boilers has led to a rise in the fireside corrosion rate of the waterwall boiler tubes in some power plants. Under normal combustion conditions, an oxidizing atmosphere helps formation of a protective oxide scale on the surface of the boiler tubes, thus impeding gaseous corrosion. However, the use of low NOx technology changes the combustion environment, resulting in the presence of reduction gases characterized by large amounts of CO and H2S. In areas of reducing atmosphere, a porous, non-protective scale is produced on the waterwalls that could leads to significant metal loss per year due to corrosion. In order to better understand the mechanisms and kinetics of the fireside corrosion, it was determined that, in addition to the type of atmosphere formed during fuel combustion, coal composition has an important role in the occurrence of fireside corrosion. The aim of this paper is to analyze the possibility of occurrence of fireside corrosion, i.e., determine the corrosion potential of domestic coals and identify possible problems that could occur during combustion using low NOx technologies.",
journal = "Proceeding of International Conference "Power Plants 2014"",
title = "The possibility of fireside corrosion occurrence in domestic boilers furnaces with low NOx combustion technology",
url = "https://hdl.handle.net/21.15107/rcub_machinery_5322"
}

Bakić, G., Šijački Žeravčić, V., Đukić, M., Tucaković, D., Stojiljković, D., Rajičić, B.,& Stupar, G.. (2014). The possibility of fireside corrosion occurrence in domestic boilers furnaces with low NOx combustion technology. in Proceeding of International Conference "Power Plants 2014".
https://hdl.handle.net/21.15107/rcub_machinery_5322

Bakić G, Šijački Žeravčić V, Đukić M, Tucaković D, Stojiljković D, Rajičić B, Stupar G. The possibility of fireside corrosion occurrence in domestic boilers furnaces with low NOx combustion technology. in Proceeding of International Conference "Power Plants 2014". 2014;.
https://hdl.handle.net/21.15107/rcub_machinery_5322 .

Bakić, Gordana, Šijački Žeravčić, Vera, Đukić, Miloš, Tucaković, Dragan, Stojiljković, Dragoslava, Rajičić, Bratislav, Stupar, Goran, "The possibility of fireside corrosion occurrence in domestic boilers furnaces with low NOx combustion technology" in Proceeding of International Conference "Power Plants 2014" (2014),
https://hdl.handle.net/21.15107/rcub_machinery_5322 .

TY  - JOUR
AU  - Mladenović, Saša
AU  - Šijački-Žeravčić, Vera
AU  - Bakić, Gordana
AU  - Lozanović Šajić, Jasmina
AU  - Rakin, Marko
AU  - Đurđević, Andrijana A.
AU  - Đukić, Miloš
PY  - 2014
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/2011
AB  - Stress calculation of steam pipeline is presented, focused on the welded joint. Numerical calculation was peiformed using the finite element method to obtain stress distribution in the welded joint made while replacing the valve chamber. Dissimilar materials were used, namely steel 10CrMoV9-10 according to EN 10216-2 for the valve chamber, the rest of steam pipeline was steel X20, whereas the transition piece material was steel X22. Residual stresses were calculated, in addition to design stresses, indicating critical regions and necessity for post-weld heat treatment.
PB  - Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd
T2  - Thermal Science
T1  - Numerical analysis of thermal stresses in welded joint made of steels x20 and x22
EP  - S126
SP  - S121
VL  - 18
DO  - 10.2298/TSCI131211178M
ER  - 

@article{
author = "Mladenović, Saša and Šijački-Žeravčić, Vera and Bakić, Gordana and Lozanović Šajić, Jasmina and Rakin, Marko and Đurđević, Andrijana A. and Đukić, Miloš",
year = "2014",
abstract = "Stress calculation of steam pipeline is presented, focused on the welded joint. Numerical calculation was peiformed using the finite element method to obtain stress distribution in the welded joint made while replacing the valve chamber. Dissimilar materials were used, namely steel 10CrMoV9-10 according to EN 10216-2 for the valve chamber, the rest of steam pipeline was steel X20, whereas the transition piece material was steel X22. Residual stresses were calculated, in addition to design stresses, indicating critical regions and necessity for post-weld heat treatment.",
publisher = "Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd",
journal = "Thermal Science",
title = "Numerical analysis of thermal stresses in welded joint made of steels x20 and x22",
pages = "S126-S121",
volume = "18",
doi = "10.2298/TSCI131211178M"
}

Mladenović, S., Šijački-Žeravčić, V., Bakić, G., Lozanović Šajić, J., Rakin, M., Đurđević, A. A.,& Đukić, M.. (2014). Numerical analysis of thermal stresses in welded joint made of steels x20 and x22. in Thermal Science
Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd., 18, S121-S126.
https://doi.org/10.2298/TSCI131211178M

Mladenović S, Šijački-Žeravčić V, Bakić G, Lozanović Šajić J, Rakin M, Đurđević AA, Đukić M. Numerical analysis of thermal stresses in welded joint made of steels x20 and x22. in Thermal Science. 2014;18:S121-S126.
doi:10.2298/TSCI131211178M .

Mladenović, Saša, Šijački-Žeravčić, Vera, Bakić, Gordana, Lozanović Šajić, Jasmina, Rakin, Marko, Đurđević, Andrijana A., Đukić, Miloš, "Numerical analysis of thermal stresses in welded joint made of steels x20 and x22" in Thermal Science, 18 (2014):S121-S126,
https://doi.org/10.2298/TSCI131211178M . .

TY  - JOUR
AU  - Debeljković, Aleksandra
AU  - Veljić, Vladimir
AU  - Šijački-Žeravčić, Vera
AU  - Matija, Lidija
AU  - Koruga, Đuro
PY  - 2014
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/1936
AB  - Industrija proizvodnje i tržište tražnje kontaktnih sočiva su pokazali visok nivo dinamičnosti u proteklih nekoliko decenija, i evoluirali su u dinamičkim promenama u kojima nauka i svakodnevna praksa stalno uzajamno interaguju. Ovaj rad predstavlja uporedno ispitivanje karakteristika osnovnog (komercijalnog) materijala i nanofotoničnog materijala koji su dobijeni inkorporacijom nanomaterijala (fulerena) i njegovih derivata u osnovni materijal za meka kontaktna sočiva. Osnovni materijal za kontaktna sočiva sintetisan je od monomera 2-hidroksietil metakrilata (HEMA), a fuleren i njegovi derivati su korišćeni zbog svojih dobrih transmisionih karakteristika u ultra-ljubičastom, vidljivom i infra-crvenom spektru. Za potrebe karakterizacije materijala za meka kontaktna sočiva korišćena je Optomagnetna spektroskopija (OMS). OMS se zasniva na konvolucionom spektru dobijenom kao razlika digitalne slike difuzno reflektovane bele svetlosti i reflektovane polarizovane bele svetlosti za plavi i crveni kanal. Ova istraživanja imaju značaj kako za optiku kontaknih sočiva tako i njihovu praktičnu biomedicinsku primenu.
AB  - The contact lens industry and market have displayed a high level of dynamism in the past few decades, and have evolved into a rapidly changing field in which science and everyday practice constantly interact. This work presents the comparative research of characteristics of the basic (commercial) material and nanophotonic materials which were obtained by incorporation of fullerene nanoparticles and its derivate in basic material for soft contact lenses. Basic contact lens material was sintetized of monomer 2-hydroxyethyl methacrylate (HEMA), and fullerene and its derivates were used due to their good transmission characteristics in ultraviolet, visible and near infra-red spectrum. For the purposes of characterization of materials for soft contact lenses Optomagnetic Spectroscopy (OMS) was used. OMS is based on difference between diffusely reflected white light and reflected polarized white light. This research contributes to applied optical science and biomedical application industry.
PB  - Univerzitet u Beogradu - Mašinski fakultet, Beograd
T2  - FME Transactions
T1  - Karakterizacija materijala za komercijalna i nova nanofotonična meka kontaktna sočiva optomagnetnom spektroskopijom
T1  - Characterization of materials for commercial and new nanophotonic soft contact lenses by optomagnetic spectroscopy
EP  - 93
IS  - 1
SP  - 88
VL  - 42
DO  - 10.5937/fmet1401090D
ER  - 

@article{
author = "Debeljković, Aleksandra and Veljić, Vladimir and Šijački-Žeravčić, Vera and Matija, Lidija and Koruga, Đuro",
year = "2014",
abstract = "Industrija proizvodnje i tržište tražnje kontaktnih sočiva su pokazali visok nivo dinamičnosti u proteklih nekoliko decenija, i evoluirali su u dinamičkim promenama u kojima nauka i svakodnevna praksa stalno uzajamno interaguju. Ovaj rad predstavlja uporedno ispitivanje karakteristika osnovnog (komercijalnog) materijala i nanofotoničnog materijala koji su dobijeni inkorporacijom nanomaterijala (fulerena) i njegovih derivata u osnovni materijal za meka kontaktna sočiva. Osnovni materijal za kontaktna sočiva sintetisan je od monomera 2-hidroksietil metakrilata (HEMA), a fuleren i njegovi derivati su korišćeni zbog svojih dobrih transmisionih karakteristika u ultra-ljubičastom, vidljivom i infra-crvenom spektru. Za potrebe karakterizacije materijala za meka kontaktna sočiva korišćena je Optomagnetna spektroskopija (OMS). OMS se zasniva na konvolucionom spektru dobijenom kao razlika digitalne slike difuzno reflektovane bele svetlosti i reflektovane polarizovane bele svetlosti za plavi i crveni kanal. Ova istraživanja imaju značaj kako za optiku kontaknih sočiva tako i njihovu praktičnu biomedicinsku primenu., The contact lens industry and market have displayed a high level of dynamism in the past few decades, and have evolved into a rapidly changing field in which science and everyday practice constantly interact. This work presents the comparative research of characteristics of the basic (commercial) material and nanophotonic materials which were obtained by incorporation of fullerene nanoparticles and its derivate in basic material for soft contact lenses. Basic contact lens material was sintetized of monomer 2-hydroxyethyl methacrylate (HEMA), and fullerene and its derivates were used due to their good transmission characteristics in ultraviolet, visible and near infra-red spectrum. For the purposes of characterization of materials for soft contact lenses Optomagnetic Spectroscopy (OMS) was used. OMS is based on difference between diffusely reflected white light and reflected polarized white light. This research contributes to applied optical science and biomedical application industry.",
publisher = "Univerzitet u Beogradu - Mašinski fakultet, Beograd",
journal = "FME Transactions",
title = "Karakterizacija materijala za komercijalna i nova nanofotonična meka kontaktna sočiva optomagnetnom spektroskopijom, Characterization of materials for commercial and new nanophotonic soft contact lenses by optomagnetic spectroscopy",
pages = "93-88",
number = "1",
volume = "42",
doi = "10.5937/fmet1401090D"
}

Debeljković, A., Veljić, V., Šijački-Žeravčić, V., Matija, L.,& Koruga, Đ.. (2014). Karakterizacija materijala za komercijalna i nova nanofotonična meka kontaktna sočiva optomagnetnom spektroskopijom. in FME Transactions
Univerzitet u Beogradu - Mašinski fakultet, Beograd., 42(1), 88-93.
https://doi.org/10.5937/fmet1401090D

Debeljković A, Veljić V, Šijački-Žeravčić V, Matija L, Koruga Đ. Karakterizacija materijala za komercijalna i nova nanofotonična meka kontaktna sočiva optomagnetnom spektroskopijom. in FME Transactions. 2014;42(1):88-93.
doi:10.5937/fmet1401090D .

Debeljković, Aleksandra, Veljić, Vladimir, Šijački-Žeravčić, Vera, Matija, Lidija, Koruga, Đuro, "Karakterizacija materijala za komercijalna i nova nanofotonična meka kontaktna sočiva optomagnetnom spektroskopijom" in FME Transactions, 42, no. 1 (2014):88-93,
https://doi.org/10.5937/fmet1401090D . .

TY  - JOUR
AU  - Bakić, Gordana
AU  - Šijački Žeravčić, Vera
AU  - Rajičić, Bratislav
AU  - Radović, Miladin
AU  - Gajić, Ivan
AU  - Maslarević, Aleksandar
AU  - Jakovljević, Aleksandar
PY  - 2014
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/4590
AB  - Heat resistant martensitic steel X20CrMoV121 (DIN) is extensively used in the last few decades as a material for tubing systems and pipelines in thermal power plants. Long term behaviour of this material is well known and understood. X20CrMoV121 is found to be reliable for prolonged service at elevated temperatures. Main disadvantage is poor weld-ability, apart from other properties of great importance for tubing systems. Failure of the tubing system during service requires quick replacement of damaged parts. In situ repair welding of martensitic steels is always problematic since it requires special welding techniques usually difficult to perform in short time during forced outages. Here we report on the repair welding procedure for the outlet superheater in two 600 MW lignite power plant units. The super heater is made of X20CrMoV121 (DIN). Outlet temperature and pressure in the super heater system are 540°C and 18.6 MPa. The local thinning of tube walls is found to be the main damage mechanism of the super heater during prolonged service. Highly erosive lignite combustion particles are identified as the main reason for wall thinning.
A serious problem is the long required period for repair welding of damaged martensitic X20CrMoV121 steel. The solution was cold welding involving repair welding by austenitic electrode with high nickel and chromium content. This technique has many advantages as short welding time, no need for special atmosphere and preheating treatment, relatively easy welding process, etc. Repaired joints are usually replaced during next overhaul, but for investigation purposes some are maintained in service over 10 years. Intensive characterization of base and filler material of repair welds after 10 years service is reported in this paper.
PB  - Belgrade : DIVK
T2  - Integritet i vek konstrukcija
T1  - Characterisation of undermatch welded joint of X20CrMoV121 steel after prolonged service
EP  - 140
IS  - 2
SP  - 133
VL  - 14
UR  - https://hdl.handle.net/21.15107/rcub_machinery_4590
ER  - 

@article{
author = "Bakić, Gordana and Šijački Žeravčić, Vera and Rajičić, Bratislav and Radović, Miladin and Gajić, Ivan and Maslarević, Aleksandar and Jakovljević, Aleksandar",
year = "2014",
abstract = "Heat resistant martensitic steel X20CrMoV121 (DIN) is extensively used in the last few decades as a material for tubing systems and pipelines in thermal power plants. Long term behaviour of this material is well known and understood. X20CrMoV121 is found to be reliable for prolonged service at elevated temperatures. Main disadvantage is poor weld-ability, apart from other properties of great importance for tubing systems. Failure of the tubing system during service requires quick replacement of damaged parts. In situ repair welding of martensitic steels is always problematic since it requires special welding techniques usually difficult to perform in short time during forced outages. Here we report on the repair welding procedure for the outlet superheater in two 600 MW lignite power plant units. The super heater is made of X20CrMoV121 (DIN). Outlet temperature and pressure in the super heater system are 540°C and 18.6 MPa. The local thinning of tube walls is found to be the main damage mechanism of the super heater during prolonged service. Highly erosive lignite combustion particles are identified as the main reason for wall thinning.
A serious problem is the long required period for repair welding of damaged martensitic X20CrMoV121 steel. The solution was cold welding involving repair welding by austenitic electrode with high nickel and chromium content. This technique has many advantages as short welding time, no need for special atmosphere and preheating treatment, relatively easy welding process, etc. Repaired joints are usually replaced during next overhaul, but for investigation purposes some are maintained in service over 10 years. Intensive characterization of base and filler material of repair welds after 10 years service is reported in this paper.",
publisher = "Belgrade : DIVK",
journal = "Integritet i vek konstrukcija",
title = "Characterisation of undermatch welded joint of X20CrMoV121 steel after prolonged service",
pages = "140-133",
number = "2",
volume = "14",
url = "https://hdl.handle.net/21.15107/rcub_machinery_4590"
}

Bakić, G., Šijački Žeravčić, V., Rajičić, B., Radović, M., Gajić, I., Maslarević, A.,& Jakovljević, A.. (2014). Characterisation of undermatch welded joint of X20CrMoV121 steel after prolonged service. in Integritet i vek konstrukcija
Belgrade : DIVK., 14(2), 133-140.
https://hdl.handle.net/21.15107/rcub_machinery_4590

Bakić G, Šijački Žeravčić V, Rajičić B, Radović M, Gajić I, Maslarević A, Jakovljević A. Characterisation of undermatch welded joint of X20CrMoV121 steel after prolonged service. in Integritet i vek konstrukcija. 2014;14(2):133-140.
https://hdl.handle.net/21.15107/rcub_machinery_4590 .

Bakić, Gordana, Šijački Žeravčić, Vera, Rajičić, Bratislav, Radović, Miladin, Gajić, Ivan, Maslarević, Aleksandar, Jakovljević, Aleksandar, "Characterisation of undermatch welded joint of X20CrMoV121 steel after prolonged service" in Integritet i vek konstrukcija, 14, no. 2 (2014):133-140,
https://hdl.handle.net/21.15107/rcub_machinery_4590 .

TY  - JOUR
AU  - Bakić, Gordana
AU  - Šijački-Žeravčić, Vera
AU  - Đukić, Miloš
AU  - Rajičić, Bratislav
AU  - Tasić, Marko M.
PY  - 2014
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/2019
AB  - Thick walled components such as high pressure (HP) steam turbine casings operating under high parameter conditions are subjected to a complex stress state. As a result of that stress state, some parts of HP turbine casing undergo to the creep fatigue caused by the combination of thermal fatigue resulted from repeated start/stop operation and the creep which occurs during long-term operation at high temperature and high-pressure. It is well known that domestic thermal power plants have been in use over 100000 h which means that significant cost is required not only for maintenance, but often for renewal of equipment. Based on comprehensive investigation, the results of residual life assessment of one high pressure steam turbine casing, which belongs to the older turbine generation, taking into account simultaneous action of thermal fatigue and creep, are presented in this paper. Also, the critical flaw crack size of HP turbine casing is determined because this parameter has a strong influence on casing integrity and residual life. The results of residual life assessment provide not only a basis for further maintenance, but also estimated time for reparation or renewal.
PB  - Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd
T2  - Thermal Science
T1  - Remaining life assessment of a high pressure turbine casing in creep and low cycle service regime
EP  - S138
SP  - S127
VL  - 18
DO  - 10.2298/TSCI121219179B
ER  - 

@article{
author = "Bakić, Gordana and Šijački-Žeravčić, Vera and Đukić, Miloš and Rajičić, Bratislav and Tasić, Marko M.",
year = "2014",
abstract = "Thick walled components such as high pressure (HP) steam turbine casings operating under high parameter conditions are subjected to a complex stress state. As a result of that stress state, some parts of HP turbine casing undergo to the creep fatigue caused by the combination of thermal fatigue resulted from repeated start/stop operation and the creep which occurs during long-term operation at high temperature and high-pressure. It is well known that domestic thermal power plants have been in use over 100000 h which means that significant cost is required not only for maintenance, but often for renewal of equipment. Based on comprehensive investigation, the results of residual life assessment of one high pressure steam turbine casing, which belongs to the older turbine generation, taking into account simultaneous action of thermal fatigue and creep, are presented in this paper. Also, the critical flaw crack size of HP turbine casing is determined because this parameter has a strong influence on casing integrity and residual life. The results of residual life assessment provide not only a basis for further maintenance, but also estimated time for reparation or renewal.",
publisher = "Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd",
journal = "Thermal Science",
title = "Remaining life assessment of a high pressure turbine casing in creep and low cycle service regime",
pages = "S138-S127",
volume = "18",
doi = "10.2298/TSCI121219179B"
}

Bakić, G., Šijački-Žeravčić, V., Đukić, M., Rajičić, B.,& Tasić, M. M.. (2014). Remaining life assessment of a high pressure turbine casing in creep and low cycle service regime. in Thermal Science
Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd., 18, S127-S138.
https://doi.org/10.2298/TSCI121219179B

Bakić G, Šijački-Žeravčić V, Đukić M, Rajičić B, Tasić MM. Remaining life assessment of a high pressure turbine casing in creep and low cycle service regime. in Thermal Science. 2014;18:S127-S138.
doi:10.2298/TSCI121219179B .

Bakić, Gordana, Šijački-Žeravčić, Vera, Đukić, Miloš, Rajičić, Bratislav, Tasić, Marko M., "Remaining life assessment of a high pressure turbine casing in creep and low cycle service regime" in Thermal Science, 18 (2014):S127-S138,
https://doi.org/10.2298/TSCI121219179B . .

TY  - GEN
AU  - Živanović, Titoslav
AU  - Šijački Žeravčić, Vera
AU  - Tucaković, Dragan
AU  - Bakić, Gordana
PY  - 2013
UR  - https://enauka.gov.rs/handle/123456789/317441
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/5329
T1  - Kontrola izbora i kvaliteta opreme i projekata za blok 3 u TE Kostolac B
UR  - https://hdl.handle.net/21.15107/rcub_machinery_5329
ER  - 

@misc{
author = "Živanović, Titoslav and Šijački Žeravčić, Vera and Tucaković, Dragan and Bakić, Gordana",
year = "2013",
title = "Kontrola izbora i kvaliteta opreme i projekata za blok 3 u TE Kostolac B",
url = "https://hdl.handle.net/21.15107/rcub_machinery_5329"
}

Živanović, T., Šijački Žeravčić, V., Tucaković, D.,& Bakić, G.. (2013). Kontrola izbora i kvaliteta opreme i projekata za blok 3 u TE Kostolac B. .
https://hdl.handle.net/21.15107/rcub_machinery_5329

Živanović T, Šijački Žeravčić V, Tucaković D, Bakić G. Kontrola izbora i kvaliteta opreme i projekata za blok 3 u TE Kostolac B. 2013;.
https://hdl.handle.net/21.15107/rcub_machinery_5329 .

Živanović, Titoslav, Šijački Žeravčić, Vera, Tucaković, Dragan, Bakić, Gordana, "Kontrola izbora i kvaliteta opreme i projekata za blok 3 u TE Kostolac B" (2013),
https://hdl.handle.net/21.15107/rcub_machinery_5329 .

TY  - CONF
AU  - Bakić, Gordana
AU  - Šijački Žeravčić, Vera
AU  - Đukić, Miloš
AU  - Maksimović, Vesna
AU  - Rajičić, Bratislav
PY  - 2013
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/5021
AB  - Changes of mechanical properties and microstructure of specimens, which
were taken from pipelines, made of heat resistant steel 1Cr0.25Mo0.25V after
approximatelly 200000 hours of service at temperature of 540°C and stress 70MPa are considered in this paper. Also, the initial specimens, made of same steel that had not been at service were investigated. Results obtained by different experimental technique show that microstructural degradation had been dominant process during prolonged service in creep conditions, which lead to the changes of mechanical properties. Microstructural degradation and damages, like creep cavities and oxidation on internal surface of pipe, were observed. The changes of mechanical properties and significant decrease of hardness and micro hardness during service are explained by different processes that take place during microstructural degradation.
PB  - Association of Metallurgical Engineers of Serbia - AMES (2013), Serbian Foundrymen Society and Metallurgical Academic Network of SEE Countries, Srbija
C3  - First Metallurgical & Materials Engineering Congress of South-East Europe (MME SEE 2013)
T1  - Material characterization of 1Cr0.25Mo0.25V power plant steel after prolonged service
DO  - 10.13140/RG.2.1.2626.1523
ER  - 

@conference{
author = "Bakić, Gordana and Šijački Žeravčić, Vera and Đukić, Miloš and Maksimović, Vesna and Rajičić, Bratislav",
year = "2013",
abstract = "Changes of mechanical properties and microstructure of specimens, which
were taken from pipelines, made of heat resistant steel 1Cr0.25Mo0.25V after
approximatelly 200000 hours of service at temperature of 540°C and stress 70MPa are considered in this paper. Also, the initial specimens, made of same steel that had not been at service were investigated. Results obtained by different experimental technique show that microstructural degradation had been dominant process during prolonged service in creep conditions, which lead to the changes of mechanical properties. Microstructural degradation and damages, like creep cavities and oxidation on internal surface of pipe, were observed. The changes of mechanical properties and significant decrease of hardness and micro hardness during service are explained by different processes that take place during microstructural degradation.",
publisher = "Association of Metallurgical Engineers of Serbia - AMES (2013), Serbian Foundrymen Society and Metallurgical Academic Network of SEE Countries, Srbija",
journal = "First Metallurgical & Materials Engineering Congress of South-East Europe (MME SEE 2013)",
title = "Material characterization of 1Cr0.25Mo0.25V power plant steel after prolonged service",
doi = "10.13140/RG.2.1.2626.1523"
}

Bakić, G., Šijački Žeravčić, V., Đukić, M., Maksimović, V.,& Rajičić, B.. (2013). Material characterization of 1Cr0.25Mo0.25V power plant steel after prolonged service. in First Metallurgical & Materials Engineering Congress of South-East Europe (MME SEE 2013)
Association of Metallurgical Engineers of Serbia - AMES (2013), Serbian Foundrymen Society and Metallurgical Academic Network of SEE Countries, Srbija..
https://doi.org/10.13140/RG.2.1.2626.1523

Bakić G, Šijački Žeravčić V, Đukić M, Maksimović V, Rajičić B. Material characterization of 1Cr0.25Mo0.25V power plant steel after prolonged service. in First Metallurgical & Materials Engineering Congress of South-East Europe (MME SEE 2013). 2013;.
doi:10.13140/RG.2.1.2626.1523 .

Bakić, Gordana, Šijački Žeravčić, Vera, Đukić, Miloš, Maksimović, Vesna, Rajičić, Bratislav, "Material characterization of 1Cr0.25Mo0.25V power plant steel after prolonged service" in First Metallurgical & Materials Engineering Congress of South-East Europe (MME SEE 2013) (2013),
https://doi.org/10.13140/RG.2.1.2626.1523 . .

TY  - CONF
AU  - Bakić, Gordana
AU  - Šijački Žeravčić, Vera
AU  - Đukić, Miloš
AU  - Rajičić, Bratislav
AU  - Anđelić, Biljana
PY  - 2012
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/5336
AB  - Klasa čelika 1.25Cr1Mo0.3V se već dugo koristi za izradu elemenata TE postrojenja izloženih povišenoj temperaturi i unutrašnjem pritisku, tako da je i na našim postrojenjima već dugo u upotrebi. Ovaj čelik je mnogo bolje poznat kao: 15H1M1F (GOST), kao livena verzija 15H1M1FL (GOST), zatim livena verzija razvijena na zapadnom tržištu G17CrMoV510 (DIN EN) i relativno nova verzija od koje se izrađuju valjani proizvodi pod oznakom 15CrMoV510 (VdTUV). Iako je ruska varijanta ovog čelika dobro poznata i sa aspekta osobina i sa aspekta ponašanja u eksploataciji, zapadna varijanta pod oznakom 15CrMoV510 se praktično tretira kao potpuno nov materijal kod kojeg nije jasno pre svega njegovo ponašanje u eksploataciji, pa čak ni neke njegove osnovne karakteristike. S obzirom da se danas čelik 15CrMoV510 intenzivno ugrađuje u naš termoenergetski sistem u procesu revitalizacije parovoda, u ovom radu je dat pregled najznačajnijih karakteristika čelika ove klase. Određene osobine čelika 1.25Cr1Mo0.3V determinišu njegovo ponašanje u uslovima eksploatacije, a one mogu da imaju prihvatljive i neprihvatljive varijacije, koje se javljaju tokom njegove fabrikacije. U ovom radu je stavljen poseban akcenat na korelaciju ključnih osobina i eksploatacione upotrebljivosti, kako za osnovni materijal tako i za zavarene spojeve.
C3  - Power Plants 2012 – Međunarodna konferencija o elektranama
T1  - Neke osobine ključne za pouzdanu eksploataciju toplotno postojanog čelika klase 1.25Cr1Mo0.3V
UR  - https://hdl.handle.net/21.15107/rcub_machinery_5336
ER  - 

@conference{
author = "Bakić, Gordana and Šijački Žeravčić, Vera and Đukić, Miloš and Rajičić, Bratislav and Anđelić, Biljana",
year = "2012",
abstract = "Klasa čelika 1.25Cr1Mo0.3V se već dugo koristi za izradu elemenata TE postrojenja izloženih povišenoj temperaturi i unutrašnjem pritisku, tako da je i na našim postrojenjima već dugo u upotrebi. Ovaj čelik je mnogo bolje poznat kao: 15H1M1F (GOST), kao livena verzija 15H1M1FL (GOST), zatim livena verzija razvijena na zapadnom tržištu G17CrMoV510 (DIN EN) i relativno nova verzija od koje se izrađuju valjani proizvodi pod oznakom 15CrMoV510 (VdTUV). Iako je ruska varijanta ovog čelika dobro poznata i sa aspekta osobina i sa aspekta ponašanja u eksploataciji, zapadna varijanta pod oznakom 15CrMoV510 se praktično tretira kao potpuno nov materijal kod kojeg nije jasno pre svega njegovo ponašanje u eksploataciji, pa čak ni neke njegove osnovne karakteristike. S obzirom da se danas čelik 15CrMoV510 intenzivno ugrađuje u naš termoenergetski sistem u procesu revitalizacije parovoda, u ovom radu je dat pregled najznačajnijih karakteristika čelika ove klase. Određene osobine čelika 1.25Cr1Mo0.3V determinišu njegovo ponašanje u uslovima eksploatacije, a one mogu da imaju prihvatljive i neprihvatljive varijacije, koje se javljaju tokom njegove fabrikacije. U ovom radu je stavljen poseban akcenat na korelaciju ključnih osobina i eksploatacione upotrebljivosti, kako za osnovni materijal tako i za zavarene spojeve.",
journal = "Power Plants 2012 – Međunarodna konferencija o elektranama",
title = "Neke osobine ključne za pouzdanu eksploataciju toplotno postojanog čelika klase 1.25Cr1Mo0.3V",
url = "https://hdl.handle.net/21.15107/rcub_machinery_5336"
}

Bakić, G., Šijački Žeravčić, V., Đukić, M., Rajičić, B.,& Anđelić, B.. (2012). Neke osobine ključne za pouzdanu eksploataciju toplotno postojanog čelika klase 1.25Cr1Mo0.3V. in Power Plants 2012 – Međunarodna konferencija o elektranama.
https://hdl.handle.net/21.15107/rcub_machinery_5336

Bakić G, Šijački Žeravčić V, Đukić M, Rajičić B, Anđelić B. Neke osobine ključne za pouzdanu eksploataciju toplotno postojanog čelika klase 1.25Cr1Mo0.3V. in Power Plants 2012 – Međunarodna konferencija o elektranama. 2012;.
https://hdl.handle.net/21.15107/rcub_machinery_5336 .

Bakić, Gordana, Šijački Žeravčić, Vera, Đukić, Miloš, Rajičić, Bratislav, Anđelić, Biljana, "Neke osobine ključne za pouzdanu eksploataciju toplotno postojanog čelika klase 1.25Cr1Mo0.3V" in Power Plants 2012 – Međunarodna konferencija o elektranama (2012),
https://hdl.handle.net/21.15107/rcub_machinery_5336 .

TY  - CHAP
AU  - Šijački Žeravčić, Vera
AU  - Bakić, Gordana
AU  - Đukić, Miloš
AU  - Rajičić, Bratislav
AU  - Anđelić, Biljana
PY  - 2012
UR  - http://idk.org.rs/monografija-korozija-i-zastita-materijala/
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/5334
PB  - ITNMS i Inženjersko društvo za koroziju (IDK), Beograd
T2  - Korozija i zaštita materijala
T1  - Korozija uređaja u termoenergetskim postrojenjima
UR  - https://hdl.handle.net/21.15107/rcub_machinery_5334
ER  - 

@inbook{
author = "Šijački Žeravčić, Vera and Bakić, Gordana and Đukić, Miloš and Rajičić, Bratislav and Anđelić, Biljana",
year = "2012",
publisher = "ITNMS i Inženjersko društvo za koroziju (IDK), Beograd",
journal = "Korozija i zaštita materijala",
booktitle = "Korozija uređaja u termoenergetskim postrojenjima",
url = "https://hdl.handle.net/21.15107/rcub_machinery_5334"
}

Šijački Žeravčić, V., Bakić, G., Đukić, M., Rajičić, B.,& Anđelić, B.. (2012). Korozija uređaja u termoenergetskim postrojenjima. in Korozija i zaštita materijala
ITNMS i Inženjersko društvo za koroziju (IDK), Beograd..
https://hdl.handle.net/21.15107/rcub_machinery_5334

Šijački Žeravčić V, Bakić G, Đukić M, Rajičić B, Anđelić B. Korozija uređaja u termoenergetskim postrojenjima. in Korozija i zaštita materijala. 2012;.
https://hdl.handle.net/21.15107/rcub_machinery_5334 .

Šijački Žeravčić, Vera, Bakić, Gordana, Đukić, Miloš, Rajičić, Bratislav, Anđelić, Biljana, "Korozija uređaja u termoenergetskim postrojenjima" in Korozija i zaštita materijala (2012),
https://hdl.handle.net/21.15107/rcub_machinery_5334 .

TY  - CONF
AU  - Đukić, Miloš
AU  - Šijački Žeravčić, Vera
AU  - Bakić, Gordana
AU  - Anđelić, Biljana
AU  - Rajičić, Bratislav
PY  - 2012
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/5331
AB  - Definisanje mehanizama uzajamnog dejstva metala sa vodonikom, koji uslovljavaju lokalnu promenu mikrostrukturnih karakteristika metala, promenu mehaničkih svojstava, a kao rezultat i pojavu različitih tipova vodoničnih oštećenja, uključujući i vodoničnu krtost, predstavlja izuzetno kompleksan problem. U zavisnosti od specifičnosti međusobnog dejstva uticajnih faktora odgovornih za inicijaciju i razvoj vodoničnih oštećenja, ispoljava se različit stepen makro pada plastičnosti metala, često praćen porastom mikro plastičnosti na lokalnom nivou koja je posledica dejstva različitih mehanizama vodonične krtosti koji su najčešće mikro lokalnog karaktera. Vodonična koroziona oštećenja, naročito kod isparivačkih cevi kotlova podkritičnih parametara, uprkos tome što su česta pojava, su istovremeno i najmanje istražena, posebno sa aspekta uslova za njihovu inicijaciju, kinetiku razvoja i mogućih uzročnika i mehanizama. U ovom radu dat je pregled savremenih saznanja iz oblasti mehanizama vodonične krtosti metala sa posebnim osvrtom na njihovo međusobno dejstvo.
C3  - Power Plants 2012 – Međunarodna konferencija o elektranama
T1  - Current State of the Art in Hydrogen Embrittlement Mechanisms of Boiler Tubes
UR  - https://hdl.handle.net/21.15107/rcub_machinery_5331
ER  - 

@conference{
author = "Đukić, Miloš and Šijački Žeravčić, Vera and Bakić, Gordana and Anđelić, Biljana and Rajičić, Bratislav",
year = "2012",
abstract = "Definisanje mehanizama uzajamnog dejstva metala sa vodonikom, koji uslovljavaju lokalnu promenu mikrostrukturnih karakteristika metala, promenu mehaničkih svojstava, a kao rezultat i pojavu različitih tipova vodoničnih oštećenja, uključujući i vodoničnu krtost, predstavlja izuzetno kompleksan problem. U zavisnosti od specifičnosti međusobnog dejstva uticajnih faktora odgovornih za inicijaciju i razvoj vodoničnih oštećenja, ispoljava se različit stepen makro pada plastičnosti metala, često praćen porastom mikro plastičnosti na lokalnom nivou koja je posledica dejstva različitih mehanizama vodonične krtosti koji su najčešće mikro lokalnog karaktera. Vodonična koroziona oštećenja, naročito kod isparivačkih cevi kotlova podkritičnih parametara, uprkos tome što su česta pojava, su istovremeno i najmanje istražena, posebno sa aspekta uslova za njihovu inicijaciju, kinetiku razvoja i mogućih uzročnika i mehanizama. U ovom radu dat je pregled savremenih saznanja iz oblasti mehanizama vodonične krtosti metala sa posebnim osvrtom na njihovo međusobno dejstvo.",
journal = "Power Plants 2012 – Međunarodna konferencija o elektranama",
title = "Current State of the Art in Hydrogen Embrittlement Mechanisms of Boiler Tubes",
url = "https://hdl.handle.net/21.15107/rcub_machinery_5331"
}

Đukić, M., Šijački Žeravčić, V., Bakić, G., Anđelić, B.,& Rajičić, B.. (2012). Current State of the Art in Hydrogen Embrittlement Mechanisms of Boiler Tubes. in Power Plants 2012 – Međunarodna konferencija o elektranama.
https://hdl.handle.net/21.15107/rcub_machinery_5331

Đukić M, Šijački Žeravčić V, Bakić G, Anđelić B, Rajičić B. Current State of the Art in Hydrogen Embrittlement Mechanisms of Boiler Tubes. in Power Plants 2012 – Međunarodna konferencija o elektranama. 2012;.
https://hdl.handle.net/21.15107/rcub_machinery_5331 .

Đukić, Miloš, Šijački Žeravčić, Vera, Bakić, Gordana, Anđelić, Biljana, Rajičić, Bratislav, "Current State of the Art in Hydrogen Embrittlement Mechanisms of Boiler Tubes" in Power Plants 2012 – Međunarodna konferencija o elektranama (2012),
https://hdl.handle.net/21.15107/rcub_machinery_5331 .

TY  - CONF
AU  - Šijački Žeravčić, Vera
AU  - Bakić, Gordana
AU  - Đukić, Miloš
AU  - Anđelić, Biljana
AU  - Rajičić, Bratislav
PY  - 2012
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/5030
AB  - From the point of view of damage, mismatched welded joints often used in the
production of the equipment, primarily pipes, are always critical sites in the system. Very often the problem is due to welding of different types of low-alloy and high-alloy steels. The selection of additional material presents a problem since the material can match only one of the steels in the mismatched joint, usually the low-alloy one. On the other hand, the selected material determines the properties of the welded joint by controlling the metallurgical processes that lead to the development of different phases with different characteristic properties. The existing experience with welding steel X10CrMoVNb91 in mismatched joints indicates that some of the phases that are formed can have negative effects on the exploitation capability of these joints. This work  considers the development of different phases during formation of joints whose one component is steel X10CrMoVNb91 that is widely used in thermal power plant equipment.
PB  - Society of Thermal Engineers of Serbia (Društvo Termičara Srbije)
C3  - Power Plants 2012 – Međunarodna konferencija o elektranama
T1  - Mismatched welded joints of X10CrMoVNb91 steel - beneficial and non beneficial properties
UR  - https://hdl.handle.net/21.15107/rcub_machinery_5030
ER  - 

@conference{
author = "Šijački Žeravčić, Vera and Bakić, Gordana and Đukić, Miloš and Anđelić, Biljana and Rajičić, Bratislav",
year = "2012",
abstract = "From the point of view of damage, mismatched welded joints often used in the
production of the equipment, primarily pipes, are always critical sites in the system. Very often the problem is due to welding of different types of low-alloy and high-alloy steels. The selection of additional material presents a problem since the material can match only one of the steels in the mismatched joint, usually the low-alloy one. On the other hand, the selected material determines the properties of the welded joint by controlling the metallurgical processes that lead to the development of different phases with different characteristic properties. The existing experience with welding steel X10CrMoVNb91 in mismatched joints indicates that some of the phases that are formed can have negative effects on the exploitation capability of these joints. This work  considers the development of different phases during formation of joints whose one component is steel X10CrMoVNb91 that is widely used in thermal power plant equipment.",
publisher = "Society of Thermal Engineers of Serbia (Društvo Termičara Srbije)",
journal = "Power Plants 2012 – Međunarodna konferencija o elektranama",
title = "Mismatched welded joints of X10CrMoVNb91 steel - beneficial and non beneficial properties",
url = "https://hdl.handle.net/21.15107/rcub_machinery_5030"
}

Šijački Žeravčić, V., Bakić, G., Đukić, M., Anđelić, B.,& Rajičić, B.. (2012). Mismatched welded joints of X10CrMoVNb91 steel - beneficial and non beneficial properties. in Power Plants 2012 – Međunarodna konferencija o elektranama
Society of Thermal Engineers of Serbia (Društvo Termičara Srbije)..
https://hdl.handle.net/21.15107/rcub_machinery_5030

Šijački Žeravčić V, Bakić G, Đukić M, Anđelić B, Rajičić B. Mismatched welded joints of X10CrMoVNb91 steel - beneficial and non beneficial properties. in Power Plants 2012 – Međunarodna konferencija o elektranama. 2012;.
https://hdl.handle.net/21.15107/rcub_machinery_5030 .

Šijački Žeravčić, Vera, Bakić, Gordana, Đukić, Miloš, Anđelić, Biljana, Rajičić, Bratislav, "Mismatched welded joints of X10CrMoVNb91 steel - beneficial and non beneficial properties" in Power Plants 2012 – Međunarodna konferencija o elektranama (2012),
https://hdl.handle.net/21.15107/rcub_machinery_5030 .

TY  - CONF
AU  - Rajičić, Bratislav
AU  - Bakić, Gordana
AU  - Đukić, Miloš
AU  - Šijački Žeravčić, Vera
AU  - Braunović, Milenko
AU  - Anđelić, Biljana
PY  - 2012
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/5018
AB  - Based on the analysis of the exploitation behavior of domestic thermal power plants it was concluded that the failures on the boiler tubing systems is due to erosion by flying ashes and that it is the main cause for the boiler tube failure especially in the evaporator and economiser surfaces. Current boiler tube erosion protection methods can be classified into three basic categories: a) welding overlay; b) thermal spraying (metallization) and c) mechanical protection. Welding overlay and thermal spraying procedures are successfully implemented on the clean boiler tubings prior to installation, although the same procedure with qualitative preparation (cleaning) can effectively be used even with the boiler tubings that were in the operation for a period of time. On modern thermal power plants in the world, thermal spraying method is widely used for the protection against erosion, abrasion and corrosion. Despite being inexpensive, mechanical protection methods are generally not used in the modern systems because of limited lifetime, difficulties during dismantling and reduced heat transfer on the protected tubings. In order to reduce the number of outages (direct material saving) and thus improve the operational reliability, availability and competitiveness, the use of modern erosion protection methods is of high priority.
PB  - Society of Thermal Engineers of Serbia (Društvo Termičara Srbije)
C3  - Power Plants 2012 – Međunarodna konferencija o elektranama
T1  - Overview of advanced methods of boiler tubes erosion protection
UR  - https://hdl.handle.net/21.15107/rcub_machinery_5018
ER  - 

@conference{
author = "Rajičić, Bratislav and Bakić, Gordana and Đukić, Miloš and Šijački Žeravčić, Vera and Braunović, Milenko and Anđelić, Biljana",
year = "2012",
abstract = "Based on the analysis of the exploitation behavior of domestic thermal power plants it was concluded that the failures on the boiler tubing systems is due to erosion by flying ashes and that it is the main cause for the boiler tube failure especially in the evaporator and economiser surfaces. Current boiler tube erosion protection methods can be classified into three basic categories: a) welding overlay; b) thermal spraying (metallization) and c) mechanical protection. Welding overlay and thermal spraying procedures are successfully implemented on the clean boiler tubings prior to installation, although the same procedure with qualitative preparation (cleaning) can effectively be used even with the boiler tubings that were in the operation for a period of time. On modern thermal power plants in the world, thermal spraying method is widely used for the protection against erosion, abrasion and corrosion. Despite being inexpensive, mechanical protection methods are generally not used in the modern systems because of limited lifetime, difficulties during dismantling and reduced heat transfer on the protected tubings. In order to reduce the number of outages (direct material saving) and thus improve the operational reliability, availability and competitiveness, the use of modern erosion protection methods is of high priority.",
publisher = "Society of Thermal Engineers of Serbia (Društvo Termičara Srbije)",
journal = "Power Plants 2012 – Međunarodna konferencija o elektranama",
title = "Overview of advanced methods of boiler tubes erosion protection",
url = "https://hdl.handle.net/21.15107/rcub_machinery_5018"
}

Rajičić, B., Bakić, G., Đukić, M., Šijački Žeravčić, V., Braunović, M.,& Anđelić, B.. (2012). Overview of advanced methods of boiler tubes erosion protection. in Power Plants 2012 – Međunarodna konferencija o elektranama
Society of Thermal Engineers of Serbia (Društvo Termičara Srbije)..
https://hdl.handle.net/21.15107/rcub_machinery_5018

Rajičić B, Bakić G, Đukić M, Šijački Žeravčić V, Braunović M, Anđelić B. Overview of advanced methods of boiler tubes erosion protection. in Power Plants 2012 – Međunarodna konferencija o elektranama. 2012;.
https://hdl.handle.net/21.15107/rcub_machinery_5018 .

Rajičić, Bratislav, Bakić, Gordana, Đukić, Miloš, Šijački Žeravčić, Vera, Braunović, Milenko, Anđelić, Biljana, "Overview of advanced methods of boiler tubes erosion protection" in Power Plants 2012 – Međunarodna konferencija o elektranama (2012),
https://hdl.handle.net/21.15107/rcub_machinery_5018 .

TY  - JOUR
AU  - Bakić, Gordana
AU  - Šijački-Žeravčić, Vera
AU  - Đukić, Miloš
AU  - Maksimović, Stevan M.
AU  - Plešinac, Dušan
AU  - Rajičić, Bratislav
PY  - 2011
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/1152
AB  - The service life of thick-walled power plant components exposed to creep, as is the case with pipelines of fresh- and reheated steam, depend on the exhaustion rate of the material. Plant operation at elevated temperatures and at temperatures below designed temperatures all relates to the material exhaustion rate, thus complicating remaining life assessment, whereas the operating temperature variation is a most common cause in the mismatching of real service and design life. Apart from temperature, the tube wall stress is a significant variable for remaining life assessment, whose calculation depends on the selected procedure, due to the complex pipeline configuration. In this paper, a remaining life assessment is performed according to the Larson-Miller parametric relation for a Æ324×36 pipe bend element of a fresh steam-pipeline, made of steel class 1Cr0.3Mo0.25V, after 160.000 hours of operation. The temperature history of the pipeline, altogether with the pipe bend, is determined based on continuous temperature monitoring records. Compared results of remaining life assessment are displayed for monitored temperature records and for designed operating temperature in the same time period. The stress calculation in the pipe bend wall is performed by three methods that are usually applied so to emphasize the differences in the obtained results of remaining life assessment.
PB  - Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd
T2  - Thermal Science
T1  - Thermal history and stress state of a fresh steam-pipeline influencing its remaining service life
EP  - 704
IS  - 3
SP  - 691
VL  - 15
DO  - 10.2298/TSCI110509050B
ER  - 

@article{
author = "Bakić, Gordana and Šijački-Žeravčić, Vera and Đukić, Miloš and Maksimović, Stevan M. and Plešinac, Dušan and Rajičić, Bratislav",
year = "2011",
abstract = "The service life of thick-walled power plant components exposed to creep, as is the case with pipelines of fresh- and reheated steam, depend on the exhaustion rate of the material. Plant operation at elevated temperatures and at temperatures below designed temperatures all relates to the material exhaustion rate, thus complicating remaining life assessment, whereas the operating temperature variation is a most common cause in the mismatching of real service and design life. Apart from temperature, the tube wall stress is a significant variable for remaining life assessment, whose calculation depends on the selected procedure, due to the complex pipeline configuration. In this paper, a remaining life assessment is performed according to the Larson-Miller parametric relation for a Æ324×36 pipe bend element of a fresh steam-pipeline, made of steel class 1Cr0.3Mo0.25V, after 160.000 hours of operation. The temperature history of the pipeline, altogether with the pipe bend, is determined based on continuous temperature monitoring records. Compared results of remaining life assessment are displayed for monitored temperature records and for designed operating temperature in the same time period. The stress calculation in the pipe bend wall is performed by three methods that are usually applied so to emphasize the differences in the obtained results of remaining life assessment.",
publisher = "Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd",
journal = "Thermal Science",
title = "Thermal history and stress state of a fresh steam-pipeline influencing its remaining service life",
pages = "704-691",
number = "3",
volume = "15",
doi = "10.2298/TSCI110509050B"
}

Bakić, G., Šijački-Žeravčić, V., Đukić, M., Maksimović, S. M., Plešinac, D.,& Rajičić, B.. (2011). Thermal history and stress state of a fresh steam-pipeline influencing its remaining service life. in Thermal Science
Univerzitet u Beogradu - Institut za nuklearne nauke Vinča, Beograd., 15(3), 691-704.
https://doi.org/10.2298/TSCI110509050B

Bakić G, Šijački-Žeravčić V, Đukić M, Maksimović SM, Plešinac D, Rajičić B. Thermal history and stress state of a fresh steam-pipeline influencing its remaining service life. in Thermal Science. 2011;15(3):691-704.
doi:10.2298/TSCI110509050B .

Bakić, Gordana, Šijački-Žeravčić, Vera, Đukić, Miloš, Maksimović, Stevan M., Plešinac, Dušan, Rajičić, Bratislav, "Thermal history and stress state of a fresh steam-pipeline influencing its remaining service life" in Thermal Science, 15, no. 3 (2011):691-704,
https://doi.org/10.2298/TSCI110509050B . .

TY  - JOUR
AU  - Šijački-Žeravčić, Vera
AU  - Bakić, Gordana
AU  - Đukić, Miloš
AU  - Rajičić, Bratislav
AU  - Anđelić, Biljana
PY  - 2010
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/1087
AB  - The problem of boiler tube erosion is a very complex problem and present in practically all fossil fuel power plants burning low heating value coals irrespective of their particular design and operating characteristics. Predicting the rate of material degradation processes due to operating conditions is the essential feature for assessing the remaining lifetime. This clearly includes the knowledge of the type and kinetics of erosion phenomenon. In order to follow the erosion process and provide a reliable prediction of erosion rate and thus tube time to failure, models taking into account all relevant effects have to be developed. In this paper the is presented results of testing carried out on the evaporator hopper tubes of 350MW unit exposed to erosion and were used to assess their remaining life.
PB  - Visoka tehnička škola strukovnih studija, Beograd
T2  - Tehnička dijagnostika
T1  - Prediction and prevention of boiler tubing systems erosion in thermal plant
EP  - 9
IS  - 2
SP  - 3
VL  - 9
UR  - https://hdl.handle.net/21.15107/rcub_machinery_1087
ER  - 

@article{
author = "Šijački-Žeravčić, Vera and Bakić, Gordana and Đukić, Miloš and Rajičić, Bratislav and Anđelić, Biljana",
year = "2010",
abstract = "The problem of boiler tube erosion is a very complex problem and present in practically all fossil fuel power plants burning low heating value coals irrespective of their particular design and operating characteristics. Predicting the rate of material degradation processes due to operating conditions is the essential feature for assessing the remaining lifetime. This clearly includes the knowledge of the type and kinetics of erosion phenomenon. In order to follow the erosion process and provide a reliable prediction of erosion rate and thus tube time to failure, models taking into account all relevant effects have to be developed. In this paper the is presented results of testing carried out on the evaporator hopper tubes of 350MW unit exposed to erosion and were used to assess their remaining life.",
publisher = "Visoka tehnička škola strukovnih studija, Beograd",
journal = "Tehnička dijagnostika",
title = "Prediction and prevention of boiler tubing systems erosion in thermal plant",
pages = "9-3",
number = "2",
volume = "9",
url = "https://hdl.handle.net/21.15107/rcub_machinery_1087"
}

Šijački-Žeravčić, V., Bakić, G., Đukić, M., Rajičić, B.,& Anđelić, B.. (2010). Prediction and prevention of boiler tubing systems erosion in thermal plant. in Tehnička dijagnostika
Visoka tehnička škola strukovnih studija, Beograd., 9(2), 3-9.
https://hdl.handle.net/21.15107/rcub_machinery_1087

Šijački-Žeravčić V, Bakić G, Đukić M, Rajičić B, Anđelić B. Prediction and prevention of boiler tubing systems erosion in thermal plant. in Tehnička dijagnostika. 2010;9(2):3-9.
https://hdl.handle.net/21.15107/rcub_machinery_1087 .

Šijački-Žeravčić, Vera, Bakić, Gordana, Đukić, Miloš, Rajičić, Bratislav, Anđelić, Biljana, "Prediction and prevention of boiler tubing systems erosion in thermal plant" in Tehnička dijagnostika, 9, no. 2 (2010):3-9,
https://hdl.handle.net/21.15107/rcub_machinery_1087 .

TY  - CONF
AU  - Bakić, Gordana
AU  - Šijački Žeravčić, Vera
AU  - Đukić, Miloš
AU  - Rajičić, Bratislav
AU  - Anđelić, Biljana
PY  - 2009
UR  - http://simterm.masfak.ni.ac.rs/index.php/en/
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/5552
AB  - Service reliability and maintenance of the major pipeline systems is still not
consider to be important issue in the country. The explicit methodology have been developed that can answer more or less accurately the crucial question of how long certain part of the pipeline can be in reliable service. This methodology is generalized approach, and can be fully applicable to the system of interest only if all specific characteristics of the examined system are taken into account, including type of fluid, specific track, expected service life, etc. In this paper, the example of how methodology for reliability assessment of the pipeline is demonstrated for the case of the magistral pipeline in fossil fuel plant, together with the example of how obtained results of the applied methodology in addition to some other measures can be used to enhance maintenance.
PB  - Društvo termičara Srbije, Mašinski fakultet Niš
C3  - 14. Simpozijum termičara Srbije, Sokobanja
T1  - Metodologija ocene eksploatacione pouzdanosti i unapređenja mera održavanja magistralnih cevovoda sprovedena na primeru
UR  - https://hdl.handle.net/21.15107/rcub_machinery_5552
ER  - 

@conference{
author = "Bakić, Gordana and Šijački Žeravčić, Vera and Đukić, Miloš and Rajičić, Bratislav and Anđelić, Biljana",
year = "2009",
abstract = "Service reliability and maintenance of the major pipeline systems is still not
consider to be important issue in the country. The explicit methodology have been developed that can answer more or less accurately the crucial question of how long certain part of the pipeline can be in reliable service. This methodology is generalized approach, and can be fully applicable to the system of interest only if all specific characteristics of the examined system are taken into account, including type of fluid, specific track, expected service life, etc. In this paper, the example of how methodology for reliability assessment of the pipeline is demonstrated for the case of the magistral pipeline in fossil fuel plant, together with the example of how obtained results of the applied methodology in addition to some other measures can be used to enhance maintenance.",
publisher = "Društvo termičara Srbije, Mašinski fakultet Niš",
journal = "14. Simpozijum termičara Srbije, Sokobanja",
title = "Metodologija ocene eksploatacione pouzdanosti i unapređenja mera održavanja magistralnih cevovoda sprovedena na primeru",
url = "https://hdl.handle.net/21.15107/rcub_machinery_5552"
}

Bakić, G., Šijački Žeravčić, V., Đukić, M., Rajičić, B.,& Anđelić, B.. (2009). Metodologija ocene eksploatacione pouzdanosti i unapređenja mera održavanja magistralnih cevovoda sprovedena na primeru. in 14. Simpozijum termičara Srbije, Sokobanja
Društvo termičara Srbije, Mašinski fakultet Niš..
https://hdl.handle.net/21.15107/rcub_machinery_5552

Bakić G, Šijački Žeravčić V, Đukić M, Rajičić B, Anđelić B. Metodologija ocene eksploatacione pouzdanosti i unapređenja mera održavanja magistralnih cevovoda sprovedena na primeru. in 14. Simpozijum termičara Srbije, Sokobanja. 2009;.
https://hdl.handle.net/21.15107/rcub_machinery_5552 .

Bakić, Gordana, Šijački Žeravčić, Vera, Đukić, Miloš, Rajičić, Bratislav, Anđelić, Biljana, "Metodologija ocene eksploatacione pouzdanosti i unapređenja mera održavanja magistralnih cevovoda sprovedena na primeru" in 14. Simpozijum termičara Srbije, Sokobanja (2009),
https://hdl.handle.net/21.15107/rcub_machinery_5552 .