起重链环断裂原因分析  

Analysis on Hydrogen Embrittlement Fracture of Lifting Chain Link

作　　者：朱闻炜 ZHU Wenwei(Shanghai Railway Certification(Group)Co.,Ltd.,Shanghai 200434,China)

机构地区：[1]上海轨道交通检测认证(集团)有限公司,上海200434

出　　处：《热处理》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)。

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.

关 键 词：20MN2钢 起重链环 氢脆 

分 类 号：TG115[金属学及工艺—物理冶金]