Unveiling liquid Pb-Bi embrittlement of 316LN stainless steel under fatigue crack propagation tests through multiscale advanced characterization

doi:10.1016/j.corsci.2025.112752

IMR OpenIR

	Unveiling liquid Pb-Bi embrittlement of 316LN stainless steel under fatigue crack propagation tests through multiscale advanced characterization
	Xue, Baoquan 1,2; Tan, Jibo 1; Wu, Xinqiang 1; Zhang, Ziyu 1; Ke, Wei 1
通讯作者	Tan, Jibo(jbtan10s@imr.ac.cn) ; Wu, Xinqiang(xqwu@imr.ac.cn)
	2025-04-15
发表期刊	CORROSION SCIENCE
ISSN	0010-938X
卷号	246 页码:15
摘要	316LN austenite stainless steel (AuSS) is a candidate structural material for the reactor vessel in lead-bismuth eutectic (LBE) cooled fast reactor. However, the potential risks of liquid metal embrittlement (LME) and the associated damage mechanisms for 316LN AuSS in LBE remain poorly understood. In this study, the micromechanisms of fatigue crack growth (FCG) of 316LN AuSS in oxygen-saturated liquid LBE at 200-400 degrees C were investigated by multiscale advanced characterization techniques. The FCG rate increased significantly when the LBE temperature exceeded 300 degrees C and the stress intensity range (Delta K) surpassed approximately 20 MPa & sdot;m0.5. Initially, 316 LN AuSS exhibited ductile cracking, which subsequently transitioned to quasicleavage and ultimately to cleavage cracking. As the crack propagated, the interaction between plastic deformation and liquid LBE wetting induced the evolution of the microstructures ahead of the crack tip, accompanied by an increase in LME sensitivity. The crack preferentially propagated along the deformation-induced microstructural interfaces, including twin boundaries and planar dislocation bands at cleavage crack tip. Liquid Pb-Bi atoms preferentially segregated at these microstructural interfaces, promoting brittle cracking. Even trace amounts of Pb atoms doped on the high-density dislocation walls can promote the interfacial cleavage cracking under conditions of high stress concentration ahead of the sharpened crack tip.
关键词	316LN austenite stainless steel Lead-bismuth eutectic Fatigue crack growth Liquid metal embrittlement
资助者	Strategic Priority Research Program of the Chinese Academy of Sciences ; Youth Innovation Promotion Association CAS ; CNNC Science Fund for Talented Young Scholars, Excellent Youth Foundation of Liaoning Province ; Xingliao Talent Plan of Liaoning Province
DOI	10.1016/j.corsci.2025.112752
收录类别	SCI
语种	英语
资助项目	Strategic Priority Research Program of the Chinese Academy of Sciences[XDA0410000] ; Youth Innovation Promotion Association CAS[2021189] ; CNNC Science Fund for Talented Young Scholars, Excellent Youth Foundation of Liaoning Province[2024JH3/10200020] ; Xingliao Talent Plan of Liaoning Province[XLYC 2202025]
WOS研究方向	Materials Science ; Metallurgy & Metallurgical Engineering
WOS类目	Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS记录号	WOS:001417757700001
出版者	PERGAMON-ELSEVIER SCIENCE LTD
引用统计
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/179981
专题	中国科学院金属研究所
通讯作者	Tan, Jibo; Wu, Xinqiang
作者单位	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
推荐引用方式 GB/T 7714	Xue, Baoquan,Tan, Jibo,Wu, Xinqiang,et al. Unveiling liquid Pb-Bi embrittlement of 316LN stainless steel under fatigue crack propagation tests through multiscale advanced characterization[J]. CORROSION SCIENCE,2025,246:15.
APA	Xue, Baoquan,Tan, Jibo,Wu, Xinqiang,Zhang, Ziyu,&Ke, Wei.(2025).Unveiling liquid Pb-Bi embrittlement of 316LN stainless steel under fatigue crack propagation tests through multiscale advanced characterization.CORROSION SCIENCE,246,15.
MLA	Xue, Baoquan,et al."Unveiling liquid Pb-Bi embrittlement of 316LN stainless steel under fatigue crack propagation tests through multiscale advanced characterization".CORROSION SCIENCE 246(2025):15.