摘要
某用直径约6mm的20Mn2钢丝材制作的起重链环在使用中断裂。对断裂的链环进行了宏观检验、断口分析、力学性能检测、金相检验和化学成分分析,以弄清其断裂的原因。结果表明:在发黑处理过程中氢溶入了链坏,从而产生氢脆。正是氢脆导致了链环断裂,断裂与链环的力学性能、化学成分和显微组织等因素无关。
A lifing chain link that was made from 20Mn2 steel wire about 6 mm in diameter broke in service.The broken chain link was tested for appearance,fracture pattern,mechanical properties,microstructure,and chemical composition,to find out the reason why the chain link broke The results showed that hydrogen dissolved in chain link during blackening,with the result that the chin link exhibited hydrogen embrittlement.It was the hydrogen embrittlemen rersulted in breaking of the chain link,having no relation to such factors as its mechanical properties,chemical composition and microstructure.
作者
朱闻炜
ZHU Wenwei(Shanghai Railway Certification(Group)Co.,Ltd.,Shanghai 200434,China)
出处
《热处理》
CAS
2021年第6期36-39,共4页
Heat Treatment
基金
国家重点研发计划资助(2019YFB1600702)。
关键词
20MN2钢
起重链环
氢脆
20Mn2 steel
lifting chain link
hydrogen embrittlement
