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On the changes in the low-cycle-fatigue life and cracking mechanism of P91 cross-weld specimens at elevated temperatures
- Authors
- Nguyen, T.T.; Yoon, K.B.; Vu, T.T.; Park, J.; Baek, U.B.
- Issue Date
- Jun-2022
- Publisher
- Elsevier Ltd
- Keywords
- 9Cr-1Mo steel; Cross-weld; High temperature; Low cycle fatigue; Type IV cracking
- Citation
- International Journal of Fatigue, v.159
- Journal Title
- International Journal of Fatigue
- Volume
- 159
- ISSN
- 0142-1123
1879-3452
- Abstract
- A significant reduction in the fatigue life of cross-weld P91 specimens was observed in tests at 538 and 566 °C compared to that at 25 °C. The remarkable reduction of the fatigue strength was directly correlated to the shift of the fatigue cracking locations from the BM region at 25 °C to the interface between the intercritical heat-affected zone (ICHAZ) and BM at elevated temperatures. The low-cycle fatigue (LCF) resistance deterioration mechanisms were attributed to synergic interactions between a high rate of microstructure deterioration accompanied by severe plastic deformation and lower strain hardenability in the ICHAZ region at elevated temperature. © 2022 Elsevier Ltd
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