TY  - CONF
AU  - Dujović, Miloš
AU  - Maslarević, Aleksandar
AU  - Bakić, Gordana
AU  - Srivastava, Ankit
AU  - Radović, Miladin
PY  - 2024
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/7745
AB  - A class of ternary layered carbides and nitrides, known as MAX
phases, combines some of the best properties of two distinct
classes of materials: metals and ceramics. Specifically, MAX phases
are stable at high temperatures, resist thermal shock, and some
even form stable and protective oxide layers in oxidizing environments.
Thus, they are excellent candidates for protective coatings
in high-temperature applications. In this context, our focus is on
using kerosene-fueled High-Velocity Oxy-Fuel spraying to deposit
MAX phases onto P91 steel substrates for use as thermal barrier
coatings. The chosen MAX phase for this study is Ti2AlC, which
offers an outstanding oxidation resistance. Our results indicate that
during the spraying procedure, a portion of the MAX phase decomposes,
another portion oxidizes, yet more than half maintains the
initial and desired stoichiometry. Nevertheless, the resulting coating
establishes a stable and robust bond with the steel substrate. In this
presentation, we will discuss the detailed analysis concerning the
relationship between the process, structure, and performance of the
Ti2AlC coating on the P91 steel substrate.
PB  - The American Ceramic Society
C3  - ABSTRACT BOOK - 48th International Conference & Exposition on Advanced Ceramics and Composites
T1  - Application and characterization of a kerosine-fuelled High Velocity Oxy-Fuel (HVOF) Ti2AlC coating on thermally stable P91 steel
SP  - 158
UR  - https://hdl.handle.net/21.15107/rcub_machinery_7745
ER  - 

@conference{
author = "Dujović, Miloš and Maslarević, Aleksandar and Bakić, Gordana and Srivastava, Ankit and Radović, Miladin",
year = "2024",
abstract = "A class of ternary layered carbides and nitrides, known as MAX
phases, combines some of the best properties of two distinct
classes of materials: metals and ceramics. Specifically, MAX phases
are stable at high temperatures, resist thermal shock, and some
even form stable and protective oxide layers in oxidizing environments.
Thus, they are excellent candidates for protective coatings
in high-temperature applications. In this context, our focus is on
using kerosene-fueled High-Velocity Oxy-Fuel spraying to deposit
MAX phases onto P91 steel substrates for use as thermal barrier
coatings. The chosen MAX phase for this study is Ti2AlC, which
offers an outstanding oxidation resistance. Our results indicate that
during the spraying procedure, a portion of the MAX phase decomposes,
another portion oxidizes, yet more than half maintains the
initial and desired stoichiometry. Nevertheless, the resulting coating
establishes a stable and robust bond with the steel substrate. In this
presentation, we will discuss the detailed analysis concerning the
relationship between the process, structure, and performance of the
Ti2AlC coating on the P91 steel substrate.",
publisher = "The American Ceramic Society",
journal = "ABSTRACT BOOK - 48th International Conference & Exposition on Advanced Ceramics and Composites",
title = "Application and characterization of a kerosine-fuelled High Velocity Oxy-Fuel (HVOF) Ti2AlC coating on thermally stable P91 steel",
pages = "158",
url = "https://hdl.handle.net/21.15107/rcub_machinery_7745"
}

Dujović, M., Maslarević, A., Bakić, G., Srivastava, A.,& Radović, M.. (2024). Application and characterization of a kerosine-fuelled High Velocity Oxy-Fuel (HVOF) Ti2AlC coating on thermally stable P91 steel. in ABSTRACT BOOK - 48th International Conference & Exposition on Advanced Ceramics and Composites
The American Ceramic Society., 158.
https://hdl.handle.net/21.15107/rcub_machinery_7745

Dujović M, Maslarević A, Bakić G, Srivastava A, Radović M. Application and characterization of a kerosine-fuelled High Velocity Oxy-Fuel (HVOF) Ti2AlC coating on thermally stable P91 steel. in ABSTRACT BOOK - 48th International Conference & Exposition on Advanced Ceramics and Composites. 2024;:158.
https://hdl.handle.net/21.15107/rcub_machinery_7745 .

Dujović, Miloš, Maslarević, Aleksandar, Bakić, Gordana, Srivastava, Ankit, Radović, Miladin, "Application and characterization of a kerosine-fuelled High Velocity Oxy-Fuel (HVOF) Ti2AlC coating on thermally stable P91 steel" in ABSTRACT BOOK - 48th International Conference & Exposition on Advanced Ceramics and Composites (2024):158,
https://hdl.handle.net/21.15107/rcub_machinery_7745 .

TY  - CHAP
AU  - Bakić, Gordana
AU  - Đukić, Miloš
AU  - Rajičić, Bratislav
AU  - Zeravčić-Šijački, Vera
AU  - Maslarević, Aleksandar
AU  - Radović, Miladin
AU  - Maksimović, Vesna
AU  - Milošević, Nenad
PY  - 2017
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/2538
AB  - The heat resistant tempered martensite ferritic steel X20CrMoV121 (DIN) has been extensively used within the last few decades as a material for boiler tubing systems and pipelines in thermal power plants (TPP). Long-term behavior of this steel is vastly researched and very well known, but main disadvantage is its poor weldability. In situ welding of martensitic steels is always challenging task and is usually quite difficult to implement properly in a short time, during forced outages of TPP. In this paper, characterization and mechanical properties of undermatch welded joint made during partial replacement of boiler outlet superheater (SH) in TPP by austenitic filler material, after 10 years of service are presented. Due to "cold" technique of welding, which does not required post weld heat treatment, this procedure were regular and widely used repair welding technique in two TPP (620 MW) units. In the purpose of comparison, two other type of matching welding joints of the same SH were also characterized: shop welded joint made by electrical resistance flash butt welding, as well as field welded joint made by gas tungsten arc welding during assembling of SH, which were both in service approximately 150,000 h.
PB  - Springer-Verlag Berlin, Berlin
T2  - Fracture At All Scales
T1  - Characterization of Tube Repair Weld in Thermal Power Plant Made of a 12% Cr Tempered Martensite Ferritic Steel
EP  - 169
SP  - 151
DO  - 10.1007/978-3-319-32634-4_8
ER  - 

@inbook{
author = "Bakić, Gordana and Đukić, Miloš and Rajičić, Bratislav and Zeravčić-Šijački, Vera and Maslarević, Aleksandar and Radović, Miladin and Maksimović, Vesna and Milošević, Nenad",
year = "2017",
abstract = "The heat resistant tempered martensite ferritic steel X20CrMoV121 (DIN) has been extensively used within the last few decades as a material for boiler tubing systems and pipelines in thermal power plants (TPP). Long-term behavior of this steel is vastly researched and very well known, but main disadvantage is its poor weldability. In situ welding of martensitic steels is always challenging task and is usually quite difficult to implement properly in a short time, during forced outages of TPP. In this paper, characterization and mechanical properties of undermatch welded joint made during partial replacement of boiler outlet superheater (SH) in TPP by austenitic filler material, after 10 years of service are presented. Due to "cold" technique of welding, which does not required post weld heat treatment, this procedure were regular and widely used repair welding technique in two TPP (620 MW) units. In the purpose of comparison, two other type of matching welding joints of the same SH were also characterized: shop welded joint made by electrical resistance flash butt welding, as well as field welded joint made by gas tungsten arc welding during assembling of SH, which were both in service approximately 150,000 h.",
publisher = "Springer-Verlag Berlin, Berlin",
journal = "Fracture At All Scales",
booktitle = "Characterization of Tube Repair Weld in Thermal Power Plant Made of a 12% Cr Tempered Martensite Ferritic Steel",
pages = "169-151",
doi = "10.1007/978-3-319-32634-4_8"
}

Bakić, G., Đukić, M., Rajičić, B., Zeravčić-Šijački, V., Maslarević, A., Radović, M., Maksimović, V.,& Milošević, N.. (2017). Characterization of Tube Repair Weld in Thermal Power Plant Made of a 12% Cr Tempered Martensite Ferritic Steel. in Fracture At All Scales
Springer-Verlag Berlin, Berlin., 151-169.
https://doi.org/10.1007/978-3-319-32634-4_8

Bakić G, Đukić M, Rajičić B, Zeravčić-Šijački V, Maslarević A, Radović M, Maksimović V, Milošević N. Characterization of Tube Repair Weld in Thermal Power Plant Made of a 12% Cr Tempered Martensite Ferritic Steel. in Fracture At All Scales. 2017;:151-169.
doi:10.1007/978-3-319-32634-4_8 .

Bakić, Gordana, Đukić, Miloš, Rajičić, Bratislav, Zeravčić-Šijački, Vera, Maslarević, Aleksandar, Radović, Miladin, Maksimović, Vesna, Milošević, Nenad, "Characterization of Tube Repair Weld in Thermal Power Plant Made of a 12% Cr Tempered Martensite Ferritic Steel" in Fracture At All Scales (2017):151-169,
https://doi.org/10.1007/978-3-319-32634-4_8 . .

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  - CONF
AU  - Milosavljević, Anđelka
AU  - Srećković, Milesa
AU  - Dinulović, Mirko
AU  - Kovačević, Katarina
AU  - Prokić-Cvetković, Radica
AU  - Radaković, Zoran
AU  - Radović, Miladin
PY  - 1993
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/5468
AB  - The hardening of two-component alloys of AlLi type is achieved by thermal precipitation, and of much practical importance are the three-component alloy group AlMgLi and multi-component AlLiCuSiMg. They possess lower values for specific weight and higher values for Young’s modulus compared to conventional aluminum alloys. Therefore, owing to their widely extended application in aircraft industry, an attempt for investigating and improving their characteristics is reasonable. In this paper an AlLiCuSiMg alloy was exposed to ruby-laser radiation, λ = 0.694 μm, 2x10exp(–6) s and 3x10exp(–8) s pulsing, and energy variations from 0.14 to 2.6 J. Scanning electron microscopy analysis of the structure has shown defined damages in the tested material. Shallow and deep craters have been observed and crater diameters have been determined. The main purpose of this investigation is to determine the differences of micro-damages in the material as a function of thermomechanical treatment. The influence of time dependent power densities (energies) was also studied.
PB  - Academy of Sciences of Ukraine
PB  - Karpenko Physiko-Mechanical Institute
C3  - Proceedings of the Eighth International Conference on Fracture, ICF8 “Fracture Mechanics: Successes and Problems” Kiev, Ukraine
T1  - Damage characteristics of laser-material interaction in AlLiCuMg alloys
EP  - 485
SP  - 481
UR  - https://hdl.handle.net/21.15107/rcub_machinery_5468
ER  - 

@conference{
author = "Milosavljević, Anđelka and Srećković, Milesa and Dinulović, Mirko and Kovačević, Katarina and Prokić-Cvetković, Radica and Radaković, Zoran and Radović, Miladin",
year = "1993",
abstract = "The hardening of two-component alloys of AlLi type is achieved by thermal precipitation, and of much practical importance are the three-component alloy group AlMgLi and multi-component AlLiCuSiMg. They possess lower values for specific weight and higher values for Young’s modulus compared to conventional aluminum alloys. Therefore, owing to their widely extended application in aircraft industry, an attempt for investigating and improving their characteristics is reasonable. In this paper an AlLiCuSiMg alloy was exposed to ruby-laser radiation, λ = 0.694 μm, 2x10exp(–6) s and 3x10exp(–8) s pulsing, and energy variations from 0.14 to 2.6 J. Scanning electron microscopy analysis of the structure has shown defined damages in the tested material. Shallow and deep craters have been observed and crater diameters have been determined. The main purpose of this investigation is to determine the differences of micro-damages in the material as a function of thermomechanical treatment. The influence of time dependent power densities (energies) was also studied.",
publisher = "Academy of Sciences of Ukraine, Karpenko Physiko-Mechanical Institute",
journal = "Proceedings of the Eighth International Conference on Fracture, ICF8 “Fracture Mechanics: Successes and Problems” Kiev, Ukraine",
title = "Damage characteristics of laser-material interaction in AlLiCuMg alloys",
pages = "485-481",
url = "https://hdl.handle.net/21.15107/rcub_machinery_5468"
}

Milosavljević, A., Srećković, M., Dinulović, M., Kovačević, K., Prokić-Cvetković, R., Radaković, Z.,& Radović, M.. (1993). Damage characteristics of laser-material interaction in AlLiCuMg alloys. in Proceedings of the Eighth International Conference on Fracture, ICF8 “Fracture Mechanics: Successes and Problems” Kiev, Ukraine
Academy of Sciences of Ukraine., 481-485.
https://hdl.handle.net/21.15107/rcub_machinery_5468

Milosavljević A, Srećković M, Dinulović M, Kovačević K, Prokić-Cvetković R, Radaković Z, Radović M. Damage characteristics of laser-material interaction in AlLiCuMg alloys. in Proceedings of the Eighth International Conference on Fracture, ICF8 “Fracture Mechanics: Successes and Problems” Kiev, Ukraine. 1993;:481-485.
https://hdl.handle.net/21.15107/rcub_machinery_5468 .

Milosavljević, Anđelka, Srećković, Milesa, Dinulović, Mirko, Kovačević, Katarina, Prokić-Cvetković, Radica, Radaković, Zoran, Radović, Miladin, "Damage characteristics of laser-material interaction in AlLiCuMg alloys" in Proceedings of the Eighth International Conference on Fracture, ICF8 “Fracture Mechanics: Successes and Problems” Kiev, Ukraine (1993):481-485,
https://hdl.handle.net/21.15107/rcub_machinery_5468 .