Transactions of Materials and Heat Treatment

Title：Inversion of heat transfer coefficient at boron steel sheet-die interface under different gaps

Authors： Wang Min Zhang Chun Xiao Haifeng Li Bing Hu Zhihua

Unit： Hubei University of Automotive Technology Huazhong University of Science and Technology

KeyWords： boron steel hot stamping interfacial heat transfer coefficient gap inverse evaluation

ClassificationCode：TH133.3；TP395.02

year,vol(issue):pagenumber：2017,42(4):179-184

Abstract：

It is of significance to evaluate the heat transfer coefficient (HTC) at the sheet-die interface under different conditions for controlling the local cooling rate of sheet and hence obtaining components with tailored microstructure and properties in the hot stamping of boron steel (HSBS). Moreover, the evaluation of the HTC can provide a reliable thermal boundary condition for numerical simulation of the HSBS process. Therefore, a simple and effective experiment setup was developed to simulate the heat transfer between sheet and die under different unilateral gaps in the HSBS, and the temperatures at measurement points were related only to the HTC between sheet and die so as to improve the evaluation accuracy. A FE-based optimization model for inversion of the HTC was established, and the HTCs between sheet B1500HS and die steel H13 were obtained under various gaps. Furthermore, it is found that the HTC decreases exponentially with the increase of gap, and the evaluated inversion of HTC was verified by the experiment.

Funds：

湖北省高等学校优秀中青年科技创新团队计划项目（T201518）；汽车动力传动与电子控制湖北省重点实验室(湖北汽车工业学院)开放基金资助项目（ZDK1201601）

王敏（1979-），女，博士，副教授 E-mail：1274385083@qq.com

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