50CrV4弹簧钢的中温二次硬化现象探讨  

An Exploration on the Mechanism of Secondary Hardening at Intermediate-Temperature in 50CrV4 Steel

作　　者：杨才定[1] 华蔚[1] 欧鹏[1] 

机构地区：[1]宝山钢铁股份有限公司,上海201900

出　　处：《中国材料科技与设备》2008年第4期80-81,83,共3页Chinese Materials Science Technology & Equipment

摘　　要：根据50CrV4中温回火工艺，对两种成分的50CRY4进行了不同时间的回火试验，对比试验结果和透射电镜分析，探讨了50Crv4的二次硬化现象。结果表明：中温回火时，随着时间的延长，合金中析出弥散分布的VC颗粒，起到了沉淀强化作用，并引起回火过程中的二次硬化现象。A kind of Intermediate-temperature tempering treatment is designed to increase the hardness of 50CRY4 steel.Through two comparson experiments and TEM the mechanism of the secondary hardening at intermediate-temperature in 50CrV4 steel is studied. The results show that the hardness of 50CrV4 steel increases by VC precipitation, and the secondary hardening at intermediate-temperature is caused by solution strengthening of the carbonide-formed V in microalloyed steel during the intermediate-temperature tempering.

关 键 词：50CRY4 二次硬化 中温回火 

分 类 号：TG113.25[金属学及工艺—物理冶金]