Embrittlement Phenomenon of China Low Activation Martensitic Steel in Liquid Pb-Bi
Yang Xu1,2; Liao Bo1; Liu Jian2; Yan Wei2; Shan Yiyin2; Xiao Furen1; Yang Ke2
Corresponding AuthorYang Ke(
AbstractChina 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.
KeywordCLAM steel liquid metal embrittlement Pb-Bi eutectic temperature strain rate
Indexed BySCI
WOS Research AreaMetallurgy & Metallurgical Engineering
WOS SubjectMetallurgy & Metallurgical Engineering
WOS IDWOS:000399922300001
Citation statistics
Document Type期刊论文
Corresponding AuthorYang Ke
Affiliation1.Yanshan Univ, Coll Mat Sci & Engn, Qinhuangdao 066004, Peoples R China
2.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China
Recommended Citation
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.
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