金属加工（热加工）Issue(1)：76-81,6.
42CrMo钢长轴感应淬火裂纹原因分析
Failure analysis of induction hardening cracks in 42CrMo long shaft
摘要
Abstract
The microstructure,morphology of cracks,composition and mechanical properties of cracked 42CrMo long shaft after induction quenching were characterized.The causes of the cracks were analyzed.The results show that the longitudinal cracks are found at the hardened layer of the larger diameter region.The grains are abnormally coarse and parts of the grain boundaries are fused compared with those of the center region.Cracks with oxides extends interannually.Therefore,the reason is due to the inappropriate parameters of the induction hardening process for the larger diameter part,which results in the over high quenching temperature,over burned grains and fused grain boundaries and thereafter cracks in the hardened layer.The thicker hardened layer and lower hardness of the larger diameter part compared with those of the smaller diameter part also testify this judgment.关键词
42CrMo钢/沿晶裂纹/感应淬火/夹杂物/过烧Key words
42CrMo/intergranular crack/induction hardening/inclusion/over burn引用本文复制引用
陈步超,宋翊,刘海明,陈露,王致远,牛宗冉,鞠玉琳,袁志钟..42CrMo钢长轴感应淬火裂纹原因分析[J].金属加工（热加工）,2024,(1):76-81,6.基金项目
国家自然科学基金(52203379). （52203379）
