Embrittlement Phenomenon of China Low Activation Martensitic Steel in Liquid Pb-Bi

doi:10.11900/0412.1961.2016.00576

CORC > 金属研究所 > 中国科学院金属研究所

	Embrittlement Phenomenon of China Low Activation Martensitic Steel in Liquid Pb-Bi
	Yang Xu 1,2; Liao Bo 1; Liu Jian 2; Yan Wei 2; Shan Yiyin 2; Xiao Furen 1; Yang Ke 2
刊名	ACTA METALLURGICA SINICA
	2017-05-11
卷号	53 期号:5 页码:513-523
关键词	CLAM steel liquid metal embrittlement Pb-Bi eutectic temperature strain rate
ISSN号	0412-1961
DOI	10.11900/0412.1961.2016.00576
通讯作者	Yang Ke(kyang@imr.ac.cn)
英文摘要	China low activation martensitic (CLAM) steel has been considered as the primary candidate structural material for application in fusion systems because of its good thermal conductivity and low thermal expansion ratio. In this work, the tensile behavior of the CLAM steel in liquid lead-bismuth eutectic was investigated to assess the compatibility of CLAM steel with liquid metal. The CLAM steel was tempered before test. The tensile tests were performed in liquid lead-bismuth eutectic and argon gas respectively at different temperatures ranging from 200 degrees C to 500 degrees C under different strain rates. All the specimens ruptured in ductile manner in argon gas environment, exhibiting obvious necking and dimples on the fracture surface. For those tested in liquid lead-bismuth eutectic, the specimens behaved ductile fracture when the test temperature was below 250 degrees C, but fractured in brittle cleavage manner in the temperature range of 300 similar to 450 degrees C. The embrittlement mainly occurred after necking, showing typical river pattern on the fracture surface with slight necking trace, and obvious cracking points were observed to initiate at the fracture edge and propagated towards the center of the specimen, namely, the appearance of the ductility trough that shows significant degradation in total elongation while no noticeable differences in strength compared with the tested specimens in argon gas environment. Furthermore, the brittle fracture disappeared and total elongation recovered when the tensile tests were performed out of the embrittlement temperature range. In slower strain rate tensile ( SSRT) tests, the temperature range of the ductility trough greatly expanded and brittle fracture occurred at temperatures below 250 degrees C. The results indicate that CLAM steel is susceptible to embrittlement in liquid lead-bismuth eutectic. This is because the contact of the liquid metal with the cracking tip leads to a decrease of the interfacial energy, which further reduces the critical cleavage stress and facilitates the brittle fracture. Both temperature and strain rate are evidenced in this work to have an effect on the embrittlement of CLAM steel.
WOS研究方向	Metallurgy & Metallurgical Engineering
语种	英语
出版者	SCIENCE PRESS
WOS记录号	WOS:000399922300001
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/124549]
专题	金属研究所_中国科学院金属研究所
通讯作者	Yang Ke
作者单位	1.Yanshan Univ, Coll Mat Sci & Engn, Qinhuangdao 066004, Peoples R China 2.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China
推荐引用方式 GB/T 7714	Yang Xu,Liao Bo,Liu Jian,et al. Embrittlement Phenomenon of China Low Activation Martensitic Steel in Liquid Pb-Bi[J]. ACTA METALLURGICA SINICA,2017,53(5):513-523.
APA	Yang Xu.,Liao Bo.,Liu Jian.,Yan Wei.,Shan Yiyin.,...&Yang Ke.(2017).Embrittlement Phenomenon of China Low Activation Martensitic Steel in Liquid Pb-Bi.ACTA METALLURGICA SINICA,53(5),513-523.
MLA	Yang Xu,et al."Embrittlement Phenomenon of China Low Activation Martensitic Steel in Liquid Pb-Bi".ACTA METALLURGICA SINICA 53.5(2017):513-523.