Room-temperature fatigue behaviour of additively-manufactured IN939 superalloy
2022
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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 pr...esence 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.
Ključne reči:
Additive manufacturing / 3D printing / Direct metal laser sintering / Fatigue / Ni-based superalloyIzvor:
International conference of experimental and numerical investigations and new technologies (2022 ; Zlatibor), 2022, 85-Izdavač:
- Innovation Center of Faculty of Mechanical Engineering, Belgrade, Serbia
Finansiranje / projekti:
- European Union H2020 Twinning project SIRAMM (H2020-WIDESPREAD-2018-03; No. 857124)
Kolekcije
Institucija/grupa
Inovacioni centarTY - 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 .