42CrMo钢螺栓开裂原因分析  

Analysis on 42CrMo Steel Bolt Cracking

作　　者：单利野 SHAN Liye(Oerlikon Balzers Coating(Suzhou)Co.,Ltd.,Suzhou 215024,Jiangsu China)

机构地区：[1]欧瑞康巴尔查斯涂层(苏州)有限公司,江苏苏州215024

出　　处：《热处理》2020年第3期56-58,共3页Heat Treatment

摘　　要：大批量42CrMo钢M24螺栓在淬火、回火后发现纵向开裂。对开裂螺栓进行了宏观检验、化学成分检测、硬度试验和金相检验。结果表明:裂纹两侧有氧化现象,裂纹具有沿晶开断裂的特征,为淬火裂纹,及螺栓开裂是由淬火不当所致。Most of the M24 bolts made of 42CrMo steel were found to be longitudinally cracked after hardening and tempering.The cracked bolt was subjected to macro check,chemical composition analysis,hardness test,and metallographic examination.The results showed that there was oxidation in two sides of the crack,and the crack was characterized by intercrystalline cracking,and was a quenching crack,namely,the bolt cracking stemmed from fault in quenching.

关 键 词：淬火裂纹 氧化 临界直径 

分 类 号：TG142.1[一般工业技术—材料科学与工程]