The low cycle fatigue behaviour of MAR-M247 superalloy under different strain rates and cycle shapes at 750?C

0560105 - ÚFM 2023 RIV GB eng J - Journal Article
Šulák, Ivo - Obrtlík, Karel - Babinský, Tomáš - Guth, S.
The low cycle fatigue behaviour of MAR-M247 superalloy under different strain rates and cycle shapes at 750?C.
International Journal of Fatigue. Roč. 164, NOV (2022), č. článku 107133. ISSN 0142-1123. E-ISSN 1879-3452
R&D Projects: GA MŠMT(CZ) EF18_053/0016933
Institutional support: RVO:68081723
Keywords : Strain rate influence * Slowfast & * fastslow tests * Creepfatigue interaction * Nickelbased superalloy * High temperature
OECD category: Materials engineering
Impact factor: 6, year: 2022
Method of publishing: Limited access
https://www.sciencedirect.com/science/article/pii/S0142112322003899?via%3Dihub

High-temperature low-cycle fatigue experiments were performed at different strain rates on nickel-based su-peralloy MAR-M247. Furthermore, slow-fast, fast-slow and dwell-fatigue tests were conducted. The deformation, damage and lifetime behaviour as a function of strain rate and cycle shape were observed. Results show that the lifetime decreases with decreasing strain rate, indicating the negative influence of time-dependent creep and oxidation mechanisms. The lifetimes of slow-fast and dwell-fatigue tests are lower than those for fast-slow tests, although the mean stress is compressive in slow-fast and dwell-fatigue tests and tensile in fast-slow tests. Slowfast and dwell-fatigue tests lead to grain boundary cavitation.
Permanent Link: https://hdl.handle.net/11104/0333302