Transactions of Materials and Heat Treatment

Title：Behavior of ultra-low temperature medium bulging for aluminum alloy tube

Authors： Fan Xiaobo Wang Xugang Chen Xianshuo Yuan Shijian

Unit： Dalian University of Technology Harbin Institute of Technology

KeyWords： aluminum alloy special-shaped tube ultra-low temperature medium bulging bulging performance deformation uniformity

ClassificationCode：TG394

year,vol(issue):pagenumber：2021,46(4):1-5

Abstract：

For the problem of easy cracking for aluminum alloy complex special-shaped tube, an ultra-low temperature medium bulging method was proposed by the double-increasing effect of simultaneous increase of elongation and hardening index for aluminum alloy at ultra-low temperature, and the bulging performance of 6061 aluminum alloy tube under the condition of liquid nitrogen temperature (-196 ℃) was tested by establishing the device of ultra-low temperature medium bulging for tube. Then, the corresponding free bulging behavior of aluminum alloy tube at ultra-low temperature was analyzed by experiment and FEM. The results show that the bulging performance of aluminum alloy tube is significantly improved under ultra-low temperature condition (-196 ℃), and the expansion rate is increased from 17.4% at normal temperature to 34.5% which is increased by nearly onetime. Furthermore, the hardening ability of aluminum alloy tube at ultra-low temperature is also enhanced, and the deformation is more uniform. At the same deformation stage, the ultimate strain and strain gradient of free bulging deformation zone are gradually reduced with the increasing of hardening index value of n.

Funds：

国家重点研发计划项目(2019YFA0708804)；中央高校基本科研业务费专项资金资助(DUT20ZD101)

凡晓波（1987-），男，博士，副研究员 E-mail：xbfan@dlut.edu.cn

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