Transactions of Materials and Heat Treatment

Title：Wear failure analysis on hot stamping die of boron steel sheet with Al-Si coating

Authors： Wu Binbin Lin Jianping Ma Zhijun Liu Yi Guo Shuijun

Unit： Tongji University Shanghai Superior Die Technology Co. Ltd.

KeyWords： hot stamping die wear failure Al-Si coating wear mechanism adhesion

ClassificationCode：TG115.2

year,vol(issue):pagenumber：2018,43(1):110-116

Abstract：

According to the problem of die wear failure in hot stamping process, for the wear retired die inserts of steel CR7V-L used for stamping of Al-Si coated plate, the micromorphology analysis, chemical element test and hardness measurement of the wear surface and profile of insert were conducted by scanning electron microscope (SEM), energy dispersive spectrometer (EDS) and microhardness tester, and the wear mechanisms of die in hot stamping process were studied. The results show that there is a special wear process in the hot stamping die of Al-Si coated plate, namely the plate coating adheres to the die surface, and then the adhesion layer falls off and new coating repeats the adhesion during the stamping process. At the same time, the oxidation and fatigue appeared on the die surface result in the material loss with detachment of the adhesive layer, which are the main wear mechanisms of the hot stamping die. In addition, the hardness on the sub-surface of die decreases, and the large plastic deformation occurs obviously. Thus, the wear failure of the hot stamping die is exacerbated.

Funds：

国家自然科学基金资助项目（10002340060）

作者简介：吴斌斌（1994-），男，硕士研究生，E-mail：chengzhuhit@163.com；通讯作者：林建平（1958-），男，教授，博士生导师，E-mail：jplin58@tongji.edu.cn

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