Evolution of residual stress, microstructure and cyclic performance of the equiatomic high-entropy alloy CoCrFeMnNi after deep rolling
| Autor: | Thomas Wegener, Torben Oevermann, L. Hübner, A. Liehr, Thomas Niendorf |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Low stress
Diffraction Materials science Mechanical Engineering Alloy engineering.material Microstructure Industrial and Manufacturing Engineering Mechanics of Materials Residual stress Modeling and Simulation engineering General Materials Science Composite material Crystal twinning Cryogenic temperature |
| Zdroj: | International Journal of Fatigue. 153:106513 |
| ISSN: | 0142-1123 |
| DOI: | 10.1016/j.ijfatigue.2021.106513 |
| Popis: | High-cycle fatigue tests were performed on differently deep rolled conditions of the equiatomic high-entropy alloy (HEA) CoCrFeMnNi. Twinning in the near-surface layer of specimens deep rolled at cryogenic temperature is revealed by electron-backscatter diffraction. As internal failure mode and similar fatigue lives are found irrespective of the deep rolling temperature, these twins are not expected to significantly contribute to the fatigue properties of the surface treated HEA. S-N curves of the initial state and deep rolled conditions revealed a point of intersection at low stress amplitudes. This unexpected behaviour is explained based on the interplay of several characteristics of the near-surface layers. |
| Databáze: | OpenAIRE |
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