Transactions of Materials and Heat Treatment

Title：Experimental study on solution treatment process of 6014 aluminum alloy in hot stamping

Authors： Shen Zhi Zhou Yingli Jin Kang Yan Jianwu Xi Jincheng

Unit： Nanchang Institute of Technology Beijing National Innovation Institute of Lightweight Ltd. Beijing Research Institute of Mechanical & Electrical Technology Ltd.

KeyWords： 6014 aluminum alloy solution treatment mechanical properties microstructure multi-goal optimization

ClassificationCode：TG307

year,vol(issue):pagenumber：2021,46(11):124-129

Abstract：

The influence laws of solution treatment process parameters on the tensile strength, hardness and elongation of 6014 aluminum alloy were studied through uniaxial tensile test and microhardness test. To quantify the influence of the process parameters on the mechanical properties, the response surface method was used to fit the binary quadratic equations to express the functional relationship. The composition of aluminum alloy after the solution treatment was analyzed by XRD. The microstructure was observed by SEM, and the grain size distribution was analyzed by EBSD, then the influence mechanism of the solid solution treatment process on the mechanical properties of material was investigated from microscopics. The parameters of the solid solution treatment process were optimized by the multi-objective optimization method. The results show that the strength and hardness of 6014 aluminum alloy increase quickly at first with the increasing of solution temperature and solution time, then decrease after reaching the peak values. The solution strengthening is realized by the second particle Mg2Si precipitating during the aging process. The growth of grain leads to the decreasing of strengthening effect when the solution temperature is too high and the solution time is too long during the solution treatment. The optimum process parameters of the solution treatment in hot stamping are the solution temperature of 530 ℃ and the solution time of 30 min.

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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