Transactions of Materials and Heat Treatment

Title：Heat transfer behavior in hot stamping of quenchable boron steel sheet

Authors： Wang Min Zhang Chun Xiao Haifeng Li Bing

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

KeyWords： quenchable boron steel sheet hot forming heat transfer finite element

ClassificationCode：

year,vol(issue):pagenumber：2014,39(1):29-34

Abstract：

The application of hot stamping of quenchable boron steel sheet (QBSS) to the automobile body manufacturing is an important way to realize lightweight of automobile. It is an urgent subject to study the heat transfer behavior between the sheet and dies in hot forming of QBSS. Taking the U-shaped part as the object, a finite element (FE) model of hot bending of QBSS was established based on ABAQUS, considering of the cooling waterway of dies and the sheet-die contact interface heat transfer coefficient being changed with contact pressure. The heat transfer behavior between the sheets and dies in the hot stamping process was revealed. The results show that the bottom of the sheet has a rapid heat transfer to dies and thus martensite phase transition (MPT) has happened in the forming process, while in the quenching process, the middle of side wall of the sheet with higher temperature has an average temperature drop rate which is higher than the martensitic critical transition rate, but its temperature after quenching is higher than the temperature for MPT, so MPT is not adequate.

Funds：

国家自然科学基金资助项目（51205116, 50905056）；材料成形与模具技术国家重点实验室开放基金资助项目（2012-P12）；校博士科研基金（BK201102）

王敏（1979-），女，博士，副教授

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