Investigation on the electrically-assisted stress relaxation of AZ31B magnesium alloy sheet

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• 作者：Huanyang Xie^a ; Xianghuai Dong^a ; ^{dongxh@sjtu.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; ^{xiehuanyang@126.com" class="auth_mail" title="E-mail the corresponding author} ; Fang Peng^a ; Qian Wang^a ; Kai Liu^a ; Xinbao Wang^a ; Fei Chen^b
• 关键词：Electric pulses ; Stress relaxation ; Springback anlge ; Microstructure
• 刊名：Journal of Materials Processing Technology
• 出版年：2016
• 出版时间：January 2016
• 年：2016
• 卷：227
• 期：Complete
• 页码：88-95
• 全文大小：3183 K

文摘

In this paper, the influence of the electrical parameters on spingback reduction during electrically-assiated sheet V-bending process was investigated. At first, electrically-assisted stress relaxation tests were carried out and the stress relaxation model considering the electric pulses was proposed and validated. In the stress relaxation tests with and without electric pulses at the same temperature, the athermal effect was observed. Based on the stress relaxation model and Mises yield criterion, the spingback angle prediction model was proposed and then verified by the V-bending experimental data. Microstructure analysis shows that detwinning occurs in the electrically-assisted stress relaxation after V-bending, which contributes to spingback reduction.