Strain-rate dependent fatigue behavior of T91 steel at 550 °C of liquid lead-bismuth eutectic

被引：0
|
作者：
Xue, Baoquan [1 ,2 ]
Tan, Jibo [1 ]
Wu, Xinqiang [1 ]
Zhang, Ziyu [1 ]
Wang, Xiang [1 ]
Ke, Wei [1 ]
机构：
[1] Chinese Acad Sci, Inst Met Res, CAS Key Lab Nucl Mat & Safety Assessment, Liaoning Key Lab Safety & Assessment Tech Nucl Mat, Shenyang 110016, Peoples R China
[2] Univ Sci & Technol China, Sch Mat Sci & Engn, Hefei 230026, Peoples R China
来源：
CORROSION SCIENCE | 2024年 / 240卷
基金：
中国国家自然科学基金;
关键词：
Steel; Fatigue; Oxidation; Embrittlement; LOW-CYCLE FATIGUE; FERRITIC-MARTENSITIC STEEL; METAL EMBRITTLEMENT; SUSCEPTIBILITY; ENVIRONMENT;
D O I：
10.1016/j.corsci.2024.112433
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Low cycle fatigue behavior of T91 steel was investigated in oxygen saturated liquid lead-bismuth eutectic (LBE) at 550 degrees C with different strain rates. The fatigue life of T91 steel decreases by about 85 % with decreasing strain rate from 0.4 % to 0.004 %/s. The crack tip was carefully analyzed by advanced characterization. The intergranular oxidation resistance of T91 steel decreases at lower strain rates, leading to fatigue failure mode changes from quasi-cleavage to cleavage cracking. Notably, the cracks (>200 mu m) propagate along the recrystallization grain boundaries with Pb/Bi segregation but without oxides detected at 0.004 %/s.
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页数：16
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