TY  - CONF
AU  - Babinský, Tomáš
AU  - Šulák, Ivo
AU  - Chlupová, Alice
AU  - Milovanović, Aleksa
AU  - Náhlík, Luboš
PY  - 2022
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/7371
AB  - This study aims to provide a comparison in fatigue behaviour between cast and additively manufactured (AM) IN939 superalloy. The AM technique in question was direct metal laser deposition. The material was tested in three thermodynamical states: (i) cast aged, (ii) as-printed and (iii) printed aged. In order to assess the influence of building direction, the specimens were printed in vertical and horizontal building directions (BD). The cylindrical specimens were tested uniaxially (parallel to vertical BD) with symmetrical push-pull cycles. The tests were conducted in strain control with a constant strain rate of 2∙10-3 s-1 at room temperature and were conducted in a low-cycle fatigue regime to evaluate the differences in cyclic plastic behaviour of the tested material states. The specimen observations prior to and after the testing were performed using scanning and transmission electron microscopy. Generally, the printed specimens exhibited significantly longer lifetimes due to the presence of casting defects in the cast material. Microscopical observations revealed that AM introduces dislocation cells which remain stable throughout the fatigue testing whereas the primary damaging mechanism in the conventional cast superalloy was the localisation of dislocations into persistent slip bands. Compared to horizontal BD at a given strain amplitude, vertical BD led to longer lifetimes, although at considerably lower stresses. The γ’ precipitates, introduced to the microstructure by ageing treatment, increased the strength of the material at the cost of lower plasticity. However, in order to clarify all the aspects of fatigue damage in AM superalloys, more work needs to be conducted.
PB  - Innovation Center of Faculty of Mechanical Engineering, Belgrade, Serbia
C3  - International conference of experimental and numerical investigations and new technologies (2022 ; Zlatibor)
T1  - Room-temperature fatigue behaviour of additively-manufactured IN939 superalloy
SP  - 85
UR  - https://hdl.handle.net/21.15107/rcub_machinery_7371
ER  - 

@conference{
author = "Babinský, Tomáš and Šulák, Ivo and Chlupová, Alice and Milovanović, Aleksa and Náhlík, Luboš",
year = "2022",
abstract = "This study aims to provide a comparison in fatigue behaviour between cast and additively manufactured (AM) IN939 superalloy. The AM technique in question was direct metal laser deposition. The material was tested in three thermodynamical states: (i) cast aged, (ii) as-printed and (iii) printed aged. In order to assess the influence of building direction, the specimens were printed in vertical and horizontal building directions (BD). The cylindrical specimens were tested uniaxially (parallel to vertical BD) with symmetrical push-pull cycles. The tests were conducted in strain control with a constant strain rate of 2∙10-3 s-1 at room temperature and were conducted in a low-cycle fatigue regime to evaluate the differences in cyclic plastic behaviour of the tested material states. The specimen observations prior to and after the testing were performed using scanning and transmission electron microscopy. Generally, the printed specimens exhibited significantly longer lifetimes due to the presence of casting defects in the cast material. Microscopical observations revealed that AM introduces dislocation cells which remain stable throughout the fatigue testing whereas the primary damaging mechanism in the conventional cast superalloy was the localisation of dislocations into persistent slip bands. Compared to horizontal BD at a given strain amplitude, vertical BD led to longer lifetimes, although at considerably lower stresses. The γ’ precipitates, introduced to the microstructure by ageing treatment, increased the strength of the material at the cost of lower plasticity. However, in order to clarify all the aspects of fatigue damage in AM superalloys, more work needs to be conducted.",
publisher = "Innovation Center of Faculty of Mechanical Engineering, Belgrade, Serbia",
journal = "International conference of experimental and numerical investigations and new technologies (2022 ; Zlatibor)",
title = "Room-temperature fatigue behaviour of additively-manufactured IN939 superalloy",
pages = "85",
url = "https://hdl.handle.net/21.15107/rcub_machinery_7371"
}

Babinský, T., Šulák, I., Chlupová, A., Milovanović, A.,& Náhlík, L.. (2022). Room-temperature fatigue behaviour of additively-manufactured IN939 superalloy. in International conference of experimental and numerical investigations and new technologies (2022 ; Zlatibor)
Innovation Center of Faculty of Mechanical Engineering, Belgrade, Serbia., 85.
https://hdl.handle.net/21.15107/rcub_machinery_7371

Babinský T, Šulák I, Chlupová A, Milovanović A, Náhlík L. Room-temperature fatigue behaviour of additively-manufactured IN939 superalloy. in International conference of experimental and numerical investigations and new technologies (2022 ; Zlatibor). 2022;:85.
https://hdl.handle.net/21.15107/rcub_machinery_7371 .

Babinský, Tomáš, Šulák, Ivo, Chlupová, Alice, Milovanović, Aleksa, Náhlík, Luboš, "Room-temperature fatigue behaviour of additively-manufactured IN939 superalloy" in International conference of experimental and numerical investigations and new technologies (2022 ; Zlatibor) (2022):85,
https://hdl.handle.net/21.15107/rcub_machinery_7371 .