Cr/Ni当量比对CAP1400核主泵泵壳用奥氏体不锈钢性能的影响  

Effect of Cr/Ni Equivalent Ratio on Microstructure and Properties of Austenitic Stainless Steel CAP1400 for Reactor Coolant Pump Casing

作　　者：康秀红[1] 胡小强[1] 郑雷刚[1] 夏立军[1] 

机构地区：[1]中国科学院金属研究所沈阳材料科学国家(联合)实验室,沈阳110016

出　　处：《材料研究学报》2018年第2期142-148,共7页Chinese Journal of Materials Research

基　　金：辽宁省科技创新重大专项(201410003)~~

摘　　要：基于热力学分析,设计了2种不同Cr/Ni当量比的CAP1400核主泵泵壳用奥氏体不锈钢,研究了Cr/Ni当量比和固溶处理温度对这类钢中铁素体的含量及其350℃拉伸性能的影响。结果表明,Cr/Ni当量比较大时,泵壳用奥氏体钢中铁素体含量较多,更为粗大;而且350℃时抗拉强度较高,能满足CAP1400核主泵泵壳的力学性能要求。在1100~1200℃不同温度固溶处理后,随着固溶处理温度的提高泵壳用奥氏体不锈钢中铁素体的含量略有提高,但是对350℃时的拉伸强度影响较小。Austenitic stainless steels with different Cr/Ni equivalent ratio for CAP1400 reactor coolant pump casings were designed based on thermodynamics consideration. The effect of Cr/Ni equivalent ratio and solution treatment temperature on the ferrite volume fraction and tensile properties of the steel at 350℃ were investigated by microstructure observation and tensile tests. Results show that with the increase of Cr/Ni equivalent ratio the amount of ferrite-phase in austenitic stainless steel increases and the ferrite-phase is more bulky. The austenitic stainless steel with high Cr/Ni equivalent ratio has a higher tensile strength at 350℃, which can meet the requirements of mechanical properties for CAP1400 pump casing. After solution treatment at different temperatures in the range from 1100~1200℃, the content of ferrite-phase in the studied steel was slightly increased with the raising of solution treatment temperature,but it had little effect on the tensile properties at 350℃.

关 键 词：金属材料 奥氏体不锈钢 Cr/Ni当量比 固溶处理 铁素体含量 核主泵泵壳 

分 类 号：TG171[金属学及工艺—金属表面处理]