Si合金化对10Cr铁/马钢在液态铅铋共晶环境中的液态金属脆化敏感性的影响  

Effect of Si Alloying on Liquid Metal Embrittlement Susceptibility of 10Cr Ferritic/martensitic Steel in Liquid Lead-bismuth Eutectic

作　　者：卓洪[1] 钟志淮 温涛 肖军[1] 王浩[1] 龚星 ZHUO Hong;ZHONG Zhihuai;WEN Tao;XIAO Jun;WANG Hao;GONG Xing(Science and Technology on Reactor Fuel and Materials Laboratory,Nuclear Power Institute of China,Chengdu of Sichuan Prov.610213,China;Advanced Nuclear Energy Research Team,College of Physics and Optoelectronic Engineering,Shenzhen University,Shenzhen of Guangdong Prov.518060,China;Institute for Advanced Study in Nuclear Energy&Safety,College of Physics and Optoelectronic Engineering,Shenzhen University,Shenzhen of Guangdong Prov.518060,China)

机构地区：[1]中国核动力研究设计院反应堆燃料及材料重点实验室,四川成都610213 [2]深圳大学物理与光电工程学院核科学与核技术系先进核能团队,广东深圳518060 [3]深圳大学物理与光电工程学院中国核能与安全高等研究院,广东深圳518060

出　　处：《核科学与工程》2024年第2期314-321,共8页Nuclear Science and Engineering

基　　金：国家自然科学基金面上基金项目(52271063)。

摘　　要：铁素体/马氏体钢是第四代液态铅铋冷却快堆燃料包壳和其他堆内构件的重要候选结构材料。Si合金化是目前国内外改善铁/马钢在铅铋环境中的腐蚀性能的关键技术手段,但Si的加入对应力腐蚀开裂敏感性(即“液态金属脆化”)的影响规律还有待深入研究。本文通过开展慢应变速率拉伸实验,对比研究了4种不同Si含量对10Cr铁素体/马氏体钢在350℃、贫氧和饱和氧铅铋以及氩气环境中的拉伸断裂行为,并结合断口分析,确定了Si对液态金属脆化敏感性的影响规律。结果表明,在所有Si含量下,铅铋对屈服强度和最大抗拉强度均没有显著影响,铅铋的影响主要体现在延伸率出现了明显下降;屈服强度随Si含量的变化基本保持不变,最大抗拉强度则呈现小幅度增大趋势;在氩气环境中,延伸率随Si含量的增加而增大。在贫氧铅铋环境中,延伸率的下降幅度与Si含量大体呈正相关。这说明Si含量越多,10Cr铁素体/马氏体钢的液态金属脆化敏感性越大。Ferritic/martensitic(F/M)steels are one of most promising candidate materials for the fuel cladding and other reactor core internals of GenⅣliquid PbBi cooled fast reactors.Alloying Si into F/M steels is a key technological measure that has been taken by the laboratories worldwide to improve the corrosion resistance of F/M steels exposed to the liquid lead-bismuth eutectic(LBE),there is insufficient information on how Si alloying affects the liquid metal embrittlement susceptibility of the steel.In this work,the effects of alloying four different Si contents on the tensile mechanical behavior and LME susceptibility of the 10Cr F/M steels in oxygen-poor or-saturated LBE and argon(Ar)have been investigated,in collaboration with fractographic examinations.The results showed that the LBE environment had little effect on the yield strength and the ultimate tensile strength at all Si contents,while the total elongation to failure was significantly reduced in presence of LBE.Yield strength is not affected much by Si alloying,while the ultimate tensile strength exhibited a slightly increasing trend.The total elongation to failure was strongly dependent on Si content.In Ar environment,the total elongation to failure increases with the increase of Si content,while a reverse trend was observed in the LBE environment.All results suggest that the LME susceptibility was promoted by Si alloying.

关 键 词：铅铋 腐蚀 铁素体/马氏体钢 奥氏体不锈钢 

分 类 号：TL341[核科学技术—核技术及应用]