渗碳淬回火工艺对G20CrNi2Mo钢组织与性能的影响  

Effect of carburizing quenching and tempering process on microstructure and properties of G20CrNi2Mo steel

作　　者：付明[1] 王智勇[2] Fu Ming;Wang Zhiyong(China Air Missile Research Institute,Luoyang Henan 471023,China;Luoyang Bearing Research Institute Co.,Ltd.,Luoyang Henan 471039,China)

机构地区：[1]中国空空导弹研究院,河南洛阳471023 [2]洛阳轴承研究所有限公司,河南洛阳471039

出　　处：《金属热处理》2020年第4期166-170,共5页Heat Treatment of Metals

基　　金：河南省科技攻关计划(172102210399,122102210059);河南省重点科技攻关项目(152102210074)。

摘　　要：以G20CrNi2Mo渗碳轴承钢为研究对象,通过扫描电镜及光学显微镜分析不同热处理工艺下的组织及硬度差异,并借助摩擦磨损试验机研究其耐磨性能的变化。结果表明,G20CrNi2Mo轴承钢渗碳后经过不同淬火及回火工艺,其硬度和耐磨性能均有了明显提高,其中,二次淬火后的组织为细小的马氏体和均匀细小的颗粒碳化物,以及少量的残留奥氏体;二次淬火后经过回火处理,200℃低温回火的组织性能最优,组织为回火马氏体,其硬度值为62. 3 HRC,磨损量为12. 9 g。The variety of hardness and microstructure for G20CrNi2Mo steel after different heat treatment was analyzed by means of the optical microscopy( OM) and scanning electron microscope( SEM). And the wear resistance for the steel was studied by the friction abrasion testing machine. The results show that the hardness and wear resistance of G20CrNi2Mo steel are improved obviously after carburizing and quenching and tempering. The microstructure is fine martensite,grain carbide,and a small amount of residual austenite after double quenching. After the second quenching and tempering,the microstructure and properties of low temperature tempering at 200 ℃ are the best,and the microstructure is tempered martensite,with hardness value and wear loss of 62. 3 HRC and 12. 9 g,respectively.

关 键 词：G20CrNi2Mo钢 淬火 回火 组织 硬度 耐磨性能 

分 类 号：TG156[金属学及工艺—热处理]