Journal
INTERNATIONAL JOURNAL OF FATIGUE
Volume 159, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ijfatigue.2022.106833
Keywords
Cross-weld; Low cycle fatigue; 9Cr-1Mo steel; High temperature; Type IV cracking; Cross-weld; Low cycle fatigue; 9Cr-1Mo steel; High temperature; Type IV cracking
Funding
- Korea Institute of Energy Technology Evaluation and Planning (KETEP) - Ministry of Trade, Industry, and Energy (MOTIE) [20181110100410]
- Korea Evaluation Institute of Industrial Technology (KEIT) [20181110100410] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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A significant reduction in the fatigue life of cross-weld P91 specimens was observed at elevated temperatures. The fatigue strength reduction was directly linked to the shift of fatigue cracking locations and the deterioration mechanisms in the intercritical heat-affected zone.
A significant reduction in the fatigue life of cross-weld P91 specimens was observed in tests at 538 and 566 degrees C compared to that at 25 degrees 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 degrees 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.
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