摘要
采用光学显微镜、扫描电镜、洛氏硬度计、电子万能试验机等研究了不同温度淬火、回火对低碳CrNiMoV轴承钢组织与力学性能的影响。结果表明:不同温度淬火的CrNiMoV钢组织主要为板条马氏体,在板条间和晶界上存在少量未溶的碳化物。不同温度回火CrNiMoV钢组织主要为板条马氏体和少量残余奥氏体,随着回火温度的升高,马氏体板条逐渐变宽。1065℃淬火+冷处理+500℃二次回火CrNiMoV钢的综合力学性能最佳,其抗拉强度、伸长率、硬度分别为1518 MPa、14.4%和48.9 HRC。
The effects of quenching and tempering at different temperatures on the microstructure and mechanical properties of low carbon CrNiMoV bearing steel were studied by means of optical microscope, scanning electron microscope,Rockwell hardness tester and electronic universal testing machine. The results show that the microstructure of CrNiMoV steel quenched at different temperatures is mainly lath martensite, with a small amount of undissolved carbide between lath and grain boundary. The microstructure of tempered steel at different temperatures is mainly lath martensite and a small amount of retained austenite. With the increase of tempering temperature, the martensitic lath becomes wider. The comprehensive mechanical properties of 1065 ℃ quenching and cold treatment and 500 ℃ secondary tempering CrNiMoV steel are the best.Its tensile strength, elongation and hardness are 1518 MPa, 14.4% and 48.9 HRC, respectively.
作者
钟利军
ZHONG Lijun(School of Mechanical Engineering,Baicheng Normal University,Baicheng 137000,China)
出处
《热加工工艺》
北大核心
2020年第24期137-139,144,共4页
Hot Working Technology
基金
教育部产学合作协同育人项目(201802355011)。
关键词
CrNiMoV钢
淬火
回火
组织
力学性能
CrNiMoV steel
quenching
tempering
microstructure
mechanical properties
