Transactions of Materials and Heat Treatment

Title：Simulation and study on influence of local heat treatment on formability for 7B04 aluminum alloy frame parts

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ClassificationCode：TG386

year,vol(issue):pagenumber：2021,46(10):187-195

Abstract：

The mechanical property parameters of original O-state and heat-treated T4-state sheets for 7B04 aluminum alloy were obtained by uniaxial tensile tests, and the stamping process and hydroforming process of complex frame parts of original O-state sheet and tailored heat treated blank (THTB) were simulated by finite element simulation software Dynaform to systematically research the influence of local heat treatment on the formability of frame parts under different forming processes. The simulation results show that the local thinning of original O-state sheet is serious when the frame parts are formed by stamping, the fracture mostly occurs in the plane strain area such as the bottom of middle stiffener and the fillet, and the local heat treatment leads to the serious fracture of sheet around the hardening area, which is unable to improve the overall formability of frame parts. When the frame parts are formed by hydroforming, the original O-state sheet cracks at the fillet of force transmission zone during the deep drawing process, and the reasonable local heat treatment scheme causes local hardening of material, which changes the strain path at the original fracture position from plane strain to single tensile strain. Therefore, the forming ability of frame parts is improved significantly.

Funds：

沈阳市重点科技研发计划对外科技交流合作专项（17-105-6-00）；国家自然科学基金青年基金（51205261）

作者简介：王志坚（1974-），女，博士，教授 E-mail：wangzhijian1974@sina.com 通信作者：宋鸿武（1981-），男，博士，研究员 E-mail：hwsong@imr.ac.cn

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