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- Title
High‐cycle and very‐high‐cycle fatigue behavior and life prediction of Ni‐based superalloy at elevated temperature.
- Authors
Li, Xiaolong; Zhang, Yucheng; Li, Wei; Zhou, Siqi; Wang, Ping
- Abstract
The tension–tension test with stress ratio 0.1 was conducted to clarify high‐cycle and very‐high‐cycle fatigue properties of Ni‐based superalloy at 750°C by combining two‐ and three‐dimensional microscopic observations. Results show that as stress level decreases, fatigue failure is less likely to be induced by pore, while the possibility of crystallographic facet‐induced failure increases, and finally, the duplex S–N curves are formed. The larger roughness of crack nucleation region is mainly attributed to the geometric incompatibility of grains and the plastic deformation at crack tip. Under the influence of elevated temperature and vacuum environment, the transition size from small crack to long crack is approximately equal to the grain size. Combined with the evaluation of threshold values, the internal failure mechanism is elucidated. Finally, from the viewpoint of energy, a fatigue life prediction model is proposed, and the predicted results are in good agreement with the experimental ones. HIGHLIGHTS: Duplex S–N curve property only related to internal failure is observed at 750°C.Crystallographic facet‐induced cracking is predominant failure mode in VHCF regime.Transition crack size from small to long is approximately equal to grain size.An energy‐based crack nucleation life prediction model is proposed.
- Subjects
HIGH temperatures; HEAT resistant alloys; MATERIAL plasticity; OXYGEN carriers; FAILURE mode &; effects analysis; FATIGUE life; GRAIN size
- Publication
Fatigue & Fracture of Engineering Materials & Structures, 2021, Vol 44, Issue 12, p3431
- ISSN
8756-758X
- Publication type
Article
- DOI
10.1111/ffe.13573