锻压技术

短时局部热处理提高2B06铝合金口框零件成形性的模拟研究

英文标题：Simulation study on formability improvement of 2B06 aluminum alloy frame through short time local heat treatment

作者：王志坚高昱霖宋鸿武王玲王佳乐

分类号：TG386

出版年,卷(期):页码：2019,44(9):133-140

摘要：

通过单向拉伸试验获得2B06铝合金原始O态和短时热处理板材的真实应力-应变曲线。采用有限元模拟方法探讨了局部热处理差性板材在铝合金复杂零件成形中的应用，系统研究了不同局部热处理方案对铝合金复杂口框零件成形性的影响，并分析了零件成形能力提高的机理。模拟结果表明：采用原始O态板材成形口框零件时，局部减薄严重，破裂多发生在平面应变变形区；合适的局部热处理方案可显著提高口框零件的成形能力，局部热处理引起的材料局部硬化可显著提高2B06铝合金局部成形性；同时，软硬材料的梯度分布可使原始破裂位置的应变路径由平面应变转变为单拉状态，显著提高板材的成形性能。

The true stress-strain curves of 2B06 aluminum alloy with original O-state and plate through short time heat treatment were obtained by uniaxial tensile test, and the application of tailored heat treated blanks (THTB) in the forming of aluminum alloy complex parts was discussed by finite element simulation method. Then, the influences of different local heat treatment schemes on the formability of aluminum alloy complex frame parts were systematically studied, and the mechanism of improving the formability of parts was also analyzed. The simulation results show that local thinning is severe and fracture occurs usually in the plane strain region when the frame part is formed by original O-state plate, and the suitable local heat treatment scheme can greatly improve the formability of the frame parts. Furthermore, the local hardening of materials caused by the local heat treatment significantly improves the local formability of 2B06 aluminum alloy. At the same time, the gradient distribution of soft and hard materials changes the strain path in the original fracture position from plane strain to uniaxial tensile state, and the formability of sheet is improved remarkably.

基金项目：

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）

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

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