Transactions of Materials and Heat Treatment

Title：Influence of pretension deformation amount on grain size of aluminum alloy 2219 after solution treatment

Authors： Zhang Jiegang Li Jiguang Zhou Chao Li Yuchen Zhang Xialu Zhang Xuexi

Unit： Tianjin Long March Launch Vehicle Manufacturing Co. Ltd. Capital Aerospace Machinery Capital Aerospace Machinery Capital Aerospace Machinery Company Harbin Institute of Technology

KeyWords： aluminum alloy 2219 grain size critical deformation amount solution treatment coarse grain

ClassificationCode：TG146.2

year,vol(issue):pagenumber：2018,43(6):162-165

Abstract：

For the problem of coarse grain in the stretch forming process of aluminum alloy 2219 scalloped segment of carrier rocket tank, in order to develop a reasonable multipass forming process, the solution treatment was conducted after the tensile specimens with annealing state were prestretched under different deformation amounts, and the grain size was measured. Then, the relationship curve between the pretension deformation before solution treatment and the grain size was established, and the influence of pretension deformation before solution treatment on the grain size of aluminum alloy 2219 after solution treatment was studied. The results show that the influences of different prestretch deformation amount on the grain size after solution treatment are significant, and there is a critical deformation amount. When the pretension deformation amount is less than 3%, the grain size is equal to the original grain size. However, when the pretension deformation amount is within 3%-5%, with increasing of the deformation amount, the grain size increases.

Funds：

天津市科技支撑项目（17YFZCGX00530）

张杰刚（1980-），男，硕士研究生；Email：664217923@qq.com；通讯作者：李继光（1981-），男，博士，高级工程师；Email：jiguangli2008@126.com

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