深层渗碳轴承滚子断裂失效分析  

Failure analysis of bearing roller after deep carburizing and quenching

作　　者：邹勇[1] 杜伟娟[1] 罗雪香[1] 崔国栋[1] 

机构地区：[1]西南交通大学材料科学与工程学院,四川成都610031

出　　处：《金属热处理》2011年第9期91-94,共4页Heat Treatment of Metals

摘　　要：经表面渗碳淬火+3次回火热处理的G20Cr2Ni4A钢轴承滚子,使用过程中发现两颗断裂。从断口位置、形态、显微组织、相组成及残留奥氏体含量等方面对轴承滚子的断裂原因进行了分析。结果表明,轴承滚子断裂主要是由于滚子内表面存在氧化物,在服役条件下,氧化物抗疲劳性能差,在最大应力处形成疲劳源,最后发生断裂。Two of the bearing rollers which were made of G20Cr2Ni4A steel with carburizing＋quenching＋three times of tempering,fractured during the running process.The causes of the fracture were analyzed through the fracture position,morphology,microstructure,phase composition and residual austenite.The results show that the main reason of the fracture of the roller is the inner surface oxidation,which makes the steel＇s anti fatigue property worse,leading to the crack initiating in stress concentration point and the final fracture.

关 键 词：轴承滚子 深层渗碳 显微组织 疲劳断裂 

分 类 号：TG15[金属学及工艺—热处理]