18CrNiMo7-6和20CrNi2Mo钢高温渗碳工艺的研究与应用  

Study and application of high temperature carburizing process for 18CrNiMo7-6 and 20CrNi2Mo steels

作　　者：刘俊祥[1] 王京晖[1] 李俏[1] 陈志英[1] 丛培武[1] 

机构地区：[1]北京机电研究所,北京100083

出　　处：《金属热处理》2013年第10期66-69,共4页Heat Treatment of Metals

基　　金："高档数控机床与基础制造装备"科技重大专项子课题(2011ZX04014-131)

摘　　要：对18CrNiMo7-6和20CrNi2Mo钢进行980℃高温渗碳工艺研究,并对其显微组织、显微硬度、表面碳浓度、奥氏体晶粒度等重要工艺指标进行分析。结果表明,为使18CrNiMo7-6和20CrNi2Mo钢渗层获得弥散分布状碳化物、较高的显微硬度、较高的晶粒度等级,通过工艺优化获得最佳工艺为:提高渗碳温度至980℃,冷却方式采用先气冷后二次加热再进行淬火。The high temperature carburizing processes for 18CrNiMo7-6 and 20CrNi2Mo steels were studied.The process indexes as the metallographic microstructure,micro-hardness,surface carbon content and the austentic grain size were analyzed .The results show that,in order to get dispersed grainy carbides in carburized layer and high hardness with finer austenitic grain , finally, the optimal process is obtained by optimizing the process , raising the carburizing temperature to 980℃and gas quenching first , then reheating and oil quenching .

关 键 词：高温渗碳 显微组织 显微硬度 表面碳浓度 晶粒度 

分 类 号：TG156.8[金属学及工艺—热处理]