Transactions of Materials and Heat Treatment

Title：Modification on constitutive model for rheological behavior of 6014 aluminum alloy in hot stamping

Authors： Shen Zhi1 Shi Yiqing2 Zhou Yingli3 Lu Jingdian1 Liu Jiayu1

Unit： 1. School of Mechanical Engineering Nanchang Institute of Technology 2. Beijing Research Institute of Mechanical & Electrical Technology Ltd. 3. Beijing National Innovation Institute of Lightweight Ltd.

KeyWords： 6014 aluminum alloy constitutive model hot stamping rheological behavior cross-part drawing

ClassificationCode：TG302

year,vol(issue):pagenumber：2021,46(12):67-73

Abstract：

The hot tensile experiments of 6014 aluminum alloy at different deformation temperatures (400-500 ℃) and different strain rates (0.01-1 s-1) were conducted by the thermal simulation experiment machine, and the influences of deformation temperature and strain rate on the mechanical behavior of 6014 aluminum alloy were analyzed. Then, using experimental data, the constitutive model of rheological behavior for 6014 aluminum alloy in hot stamping was established and modified based on the hyperbolic sine function model using Zener-Hollmon parameters, and the numerical simulation and experiment of cross-part drawing were compared and verified. The results show that the rheological stress of 6014 aluminum alloy increases rapidly first and then becomes steadily with the increasing of strain, which increases with the increasing of strain rate and decreases with the increasing of deformation temperature. In addition, the fracture morphology of specimen observed by SEM is ductile fracture, indicating that the plasticity of 6014 aluminum alloy is greatly improved at high temperature, and the modified constitutive model has high accuracy with an average error of 5.4%.

Funds：

江西省教育厅科技项目（GJJ201903）；国家科技重大专项(2014ZX04002-071)

作者简介：沈智（1980-），男，博士，讲师，工程师 E-mail：nickshen009@163.com

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