金属加工（热加工）Issue(6)：11-16,6.
Cr8钢冲模试模过程早期断裂失效分析
Cr8 steel failure analysis of early fracture in stamping die test
摘要
Abstract
The fracture of the Cr8 steel stamping die occurred in the process of die testing.The fracture samples were examined by metallographic microscope,sem and eds.The collapse fracture of the stamping die was examined,and the sheet-like extrusion deformation was found on the sinking platform,which indicated that the strength of the material was low.The surface of the platform was heavily oxidized,the sample was heated and oil quenched,and the heating process was not vacuum heat treatment.The R angle of the groove is very small,and the stress concentration is very large,so the stress concentration cracking is easy to occur.The tempered sorbite has been formed in most of the Matrix after heat treatment,and the strength of the material is greatly reduced.Many surface cracks were observed on the side fracture surface,which resulted in severe deformation of the sample Matrix.The fracture of the stamping die is mainly caused by the abnormal heat treatment process,the obvious decrease of material strength and the fracture of the die under the external force.The oxidation delamination of the platform is serious,the R angle of the groove is very small,and the stress concentration is very large.关键词
韧窝断口/解理断口/应力集中开裂/回火索氏体/回火屈氏体Key words
dimple fracture/cleavage fracture/stress concentration fracture/tempered sorbite/tempered troostite引用本文复制引用
金林奎,姜影,方曼婷,王玉才,游菲..Cr8钢冲模试模过程早期断裂失效分析[J].金属加工（热加工）,2024,(6):11-16,6.基金项目
广东省东莞市产学研合作项目(202150901500294). （202150901500294）
