摘要
对9Cr3W3Co钢在传统正火热处理和3种不同温度二次正火热处理后的显微组织和冲击韧性进行了研究。结果表明:二次低温正火可以有效细化9Cr3W3Co钢传统正火热处理后的粗大晶粒,回火后冲击断口的剪切唇面积大幅增加;二次低温正火过程中析出富Nb、V的MX相颗粒,有益于晶粒的细化,同时回火后的M23C6碳化物更为细小弥散,两者的共同作用带来了冲击韧性的提升。
Microstructure and impact toughness of 9Cr3W3 Co steel after conventional normalizing and double normalizing with different second normalizing temperatures were investigated. The result show that grain refinement could be achieved after doubled normalizing with lower second normalizing temperature,and the area fraction of shear lip in fractography of impact specimens increased greatly after subsequent tempering; MX particles with rich niobium and vanadium lead to fine grains after second normalizing at lower temperature and the M23C6 carbides formed during tempering become much finer and better dispersed. The interactive effect by these two factors brings about higher toughness of 9Cr3W3 Co steel.
出处
《金属热处理》
CAS
CSCD
北大核心
2017年第3期18-23,共6页
Heat Treatment of Metals
基金
国家能源应用技术研究及工程示范项目(NY201501)
国家重点研发计划(2016YFB0300203)
