Transactions of Materials and Heat Treatment

Title：Research on thermal contact resistance for boron steel sheet in hot stamping process

Authors： Hu Yi Wang Chao Xu Fengxiang Liu Guocheng

Unit： Wuhan University of Technology

KeyWords： high strength steel hot stamping sequential function method thermal contact resistance cooling path

ClassificationCode：TG306；TG113

year,vol(issue):pagenumber：2018,43(7):147-152

Abstract：

The cooling path of blank directly affects mechanical properties of formed parts in the hot stamping process of high strength steel, and reliable thermal contact resistance can improve the accuracy of simulation results of temperature fields in the hot stamping process. In order to research the thermal contact resistance of interface between blank and die in the hot stamping process, for boron steel sheet WH1300HF without coating for hot stamping, a flat die experiment of hot stamping for boron steel sheet was performed on a small experimental servo press, and the cooling curves of blank quenching and die temperature under different pressures were obtained. Furthermore, the heat flux density and the thermal contact resistance of interface between blank and die were estimated by sequential function method. The results show that the peak values of heat flux density of interface between blank and die increase with the increasing of pressure, and the stable values of thermal contact resistance decreases with the increasing of pressure. Thus, according to the law of energy conservation, the latent heat of martensitic phase transformation in the hot stamping process for boron steel sheet and the martensitic fraction in the flat die quenching experiment were calculated.

Funds：

国家自然科学基金资助项目 (51605353)；材料成形与模具技术国家重点实验室开放基金资助项目 (P2016-05)；湖北省自然科学基金计划项目(2016CFB269)

胡翼（1983-），男，硕士，实验师，E-mail：68235238@qq.com；通讯作者：王超（1985-），男，博士，讲师，E-mail：wchao@whut.edu.cn

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