PSI - Issue 43

Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2022) 000 – 000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2022) 000 – 000

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ScienceDirect

Procedia Structural Integrity 43 (2023) 136–141

© 2023 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under the responsibility of MSMF10 organizers. © 20 23 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under the responsibility of MSMF10 organizers. Abstract The presented study is focused on experimental results of high- ycle fa igue life of a cast polycrystalline nickel-based superalloy IN 738LC at temperat res of 800, 900, and 950 °C. The abs nce of hot isostatic pressing (HIP) led to the occurrence of casting defects i th microstructure. The fatigue tests were perf rmed n symmetrical loading in laboratory air. Th fractur surfaces of specimens were studied by scan ing electron icroscopy t descr be th influence f temperatur on th fati ue damage mech nism and fatigu crack initiation. Change in the primary crack propagation mechanism from crystalline (stage I regi e) to non- rystalline (stag II regime) m chanism was bserved with increasing temp rature. However, the effect of changing mechanism caused by temperature dependence was unfavorably influenced by casting defects. © 20 23 The Authors. Published by Elsevier B.V. This is an ope access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under the responsibility of MSMF10 organizers. 10th International Conference on Materials Structure and Micromechanics of Fracture High-cycle fatigue behavior of IN 738LC superalloy at high temperatures Vít Horník a,b, *, Adrián Bača a , Miroslav Šmíd a , Karel Hrbáček c , Pavel Hutař a,b a Institute of Physics of Materials, AS CR, Žižkova 22, Brno, 616 62, Czech Republic b CEITEC IPM, Žižkova 22, Brno, 616 62, Czech Republic c PBS Velká Bíteš, a. s., Vlkovská 279, Velká Bíteš, 595 12, Czech R epublic Abstract The presented study is focused on experimental results of high-cycle fatigue life of a cast polycrystalline nickel-based superalloy IN 738LC at temperatures of 800, 900, and 950 °C. The absence of hot isostatic pressing (HIP) led to the occurrence of casting defects in the microstructure. The fatigue tests were performed in symmetrical loading in laboratory air. The fracture surfaces of specimens were studied by scanning electron microscopy to describe the influence of temperature on the fatigue damage mechanism and fatigue crack initiation. Change in the primary crack propagation mechanism from crystalline (stage I regime) to non-crystalline (stage II regime) mechanism was observed with increasing temperature. However, the effect of changing mechanism caused by temperature dependence was unfavorably influenced by casting defects. 10th International Conference on Materials Structure and Micromechanics of Fracture High-cycle fatigue behavior of IN 738LC superalloy at high temperatures Vít Horník a,b, *, Adrián Bača a , Miroslav Šmíd a , Karel Hrbáček c , Pavel Hutař a,b a Institute of Physics of Materials, AS CR, Žižkova 22, Brno, 616 62, Czech Republic b CEITEC IPM Žižkova 2 , Brno, 616 62, Czech Republic c PBS Velká Bíteš, a. s., Vlkovská 279, Velká Bíteš, 595 12, Czech R epublic 1. Introduction The components working in a high-temperature environment (over 650 °C) like turbine blades or turbocharger wheels, have to be manufactured from a material with good high-temperature strength and oxidation resistance. One of the advanced classes of materials is cast polycrystalline Ni-based superalloys, whose complex structure 1. Introduction The components working in a high-te p rature environment (over 650 °C) like turbine bl des or turbo harger wheels, ha e to be manufactured from a material with good high-temperature strength and oxidation resistance. On of the advanced classes of materials is cast polycrystalline Ni-based superalloys, whose complex structure Keywords: high-cycle fatigue; superalloy; high-temperatures; IN 738LC, fractography Keywords: high-cycle fatigue; superalloy; high-temperatures; IN 738LC, fractography

* Corresponding author. E-mail address: hornik@ipm.cz * Correspon ing author. E-mail address: hornik@ipm.cz

2452-3216 © 2023 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under the responsibility of MSMF10 organizers. 2452-3216 © 2023 The Authors. Published by Elsevier B.V. This is an ope access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under the responsibility of MSMF10 organizers.

2452-3216 © 2023 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under the responsibility of MSMF10 organizers. 10.1016/j.prostr.2022.12.248