Study on Embrittlement Sensitivity of SIMP Tempered at Low Temperature in Liquid Metal Under Lead-Bismuth Eutectic Alloy
ZHANG Jie1, QIN Bo1,2, FU Xiaogang1, LONG Bin1,2,*
1 Department of Reactor Engineering and Technology, China Institute of Atomic Energy, Beijing 102413, China 2 Innovation Center of Nuclear Materials, China Atomic Energy Authority, Beijing 102413, China
Abstract: This work systematically examines the effects of temperature and strain rate on liquid metal embrittlement (LME) susceptibility of silicon-enhanced ferritic/martensitic SIMP steel in lead-bismuth eutectic (LBE) environments, with emphasis on elucidating the underlying mechanisms. To simulate irradiation-induced hardening, SIMP steel was tempered at 500 ℃, a reduced temperature compared to conventional proces-sing. Slow strain rate tensile (SSRT) tests were conducted on 500 ℃-tempered specimens in both argon and oxygen-saturated LBE at temperatures ranging from 350 ℃ to 550 ℃, with strain rates varying between 2×10-6 s-1 and 1×10-5 s-1. Comparative analyses were performed against reference specimens tempered at 760 ℃. Results demonstrated threre is a pronounced LME susceptibility in 500 ℃-tempered specimens at 350 ℃ and 400 ℃, evidenced by a marked reduction in total elongation and quasi-brittle fracture morphology. Notably, this embrittlement vanishes at 550 ℃, where ductile fracture characteristics and full elongation recovery are observed. In contrast, 760 ℃-tempered specimens exhibited no LME across all tested conditions. Strain rate dependence studies reveal that LME persists at both low (2×10-6 s-1) and high (1×10-5 s-1) strain rates for 500 ℃-tempered steel; however, sensitivity is significantly amplified at lower strain rates. The research results should provide an important basis for understanding the service performance of SIMP steel in LBE environment.
张洁, 秦博, 付晓刚, 龙斌. 低温回火的SIMP钢在铅铋共晶合金下的液态金属脆化敏感性研究[J]. 材料导报, 2026, 40(8): 25030039-10.
ZHANG Jie, QIN Bo, FU Xiaogang, LONG Bin. Study on Embrittlement Sensitivity of SIMP Tempered at Low Temperature in Liquid Metal Under Lead-Bismuth Eutectic Alloy. Materials Reports, 2026, 40(8): 25030039-10.
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2026, Vol. 40 
