Transactions of Materials and Heat Treatment

Title：Formability window of TRIP600 high strength steel sheet at variable blank-holder force

Authors： CHEN Shu-wan JIANG Min ZHAN Yan-ran HUANG Sheng

Unit： Yuncheng University Yujie Automobile Design Co. Ltd. Fuzhou University

KeyWords： TRIP600 high strength steel sheet variable blank-holder force formability window wrinkle crack

ClassificationCode：TG316.3

year,vol(issue):pagenumber：2013,38(4):124-130

Abstract：

In order to improve the stamping formability of TRIP high strength steel effectively, based on the principal theory of sheet metal forming, the basic mechanical parameters of TRIP600 high strength steel sheet were got via uniaxial tensile test and the Naddrg model of forming limit curve (FLC). And on the basis of the analysis of failure criterion of sheet metal forming, the established method of VBHF forming window was proposed. With the example of a cylindrical part, the VBHF forming window whose accuracy was proved by numerical simulation and experiment was established. The result of the experiment and numerical simulation shows that the TRIP high strength steel material is a new type high strength material with high elongation and low elastic modulus. The plane strain (FLD0) of TRIP600 high strength steel plate with the thickness of 1.2mm is 0.397. The variable blank-holder force curve of critical wrinkless and critical fracture in formability window can be obtained by adjusting the variable blank-holder force (VBHF) to make parts in the critical wrinkling state and two extreme loading modes respectively. And the forming window can guide the practical stamping production of TRIP high strength steel.

Funds：

福建省自然科学基金资助项目（2008J0153）

陈淑婉（1986-)，女，硕士，助教

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