Numerical Simulation of Square Tube Extrusion for AZ31 Magnesium Alloys
摘 要
基于AZ31镁合金热压缩真应力-真应变曲线, 计算得到了流变应力方程, 分析了合金压缩变形后的显微组织, 并用HyperXtrude有限元分析软件对AZ31镁合金方管挤压成型进行了数值模拟, 最后进行了试验验证。结果表明: AZ31镁合金的流变应力随变形温度的升高而减小, 并在350 ℃以上较快达到稳态, 易于加工成型; 热压缩变形后合金中的孪晶组织随温度的升高有所减少, 且晶粒不断长大, 在高应变速率时由于动态再结晶不充分, 晶界附近形成类似“项链”状的细小晶粒组织; 有限元模拟分析发现方管角部金属流速低于中心位置, 在HyperStudy中经工作带优化后流速分布均匀, 采用优化设计的模具挤压生产出了合格的AZ31镁合金型材。
Abstract
On the basis of true flow stress-true strain curves of AZ31 magnesium alloys obtained from hot compression process, the corresponding flow stress equation was presented and the microstructure of the compressed alloy was analyzed. The square tube extrusion process for AZ31 magnesium alloy was simulated by using the HyperXtrude software. The results show that the flow stress decreased with the increasing temperature and could reach the steady state quickly above 350 ℃, which is suitable for processing forming. The twins in hot compression specimens reduced with the temperature increasing, moreover the grains were growing up. With the high strain rate, the fine grains similar to “necklace” appeared on the grain boundaries due to the insufficiency of dynamic recrystallization. The finite element simulation results show that the metal velocity in the corner of the square tube was lower than that in the center, but could distribute well as the optimization of the bearing part in the HyperStudy. The die designed on the optimized die bearing model proved to be capable of producing the qualified products in practice.
中图分类号 TG379 DOI 10.11973/jxgccl201510019
所属栏目 物理模拟与数值模拟
基金项目 嘉兴市重大科技专项项目(2010AZ2001)
收稿日期 2014/9/4
修改稿日期 2015/7/23
网络出版日期
作者单位点击查看
备注孙颖迪(1983-), 女, 山东青岛人, 助理研究员, 博士。
引用该论文: SUN Ying-di,LI Guang-zhen,CHEN Qiu-rong. Numerical Simulation of Square Tube Extrusion for AZ31 Magnesium Alloys[J]. Materials for mechancial engineering, 2015, 39(10): 84~89
孙颖迪,李光振,陈秋荣. AZ31镁合金方管挤压成型的数值模拟[J]. 机械工程材料, 2015, 39(10): 84~89
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【4】ZHANG C S, ZHAO G Q, CHEN Z R, et al.Effect of extrusion stem speed on extrusion process for a hollow aluminum profile[J]. Materials Science and Engineering: B, 2012, 177(19): 1691-1697.
【5】GUAN Y J, ZHANG C S, ZHAO G Q, et al. Design of a multihole porthole die for aluminum tube extrusion[J]. Materials and Manufacturing Processes, 2012, 27(2): 147-153.
【6】ZHANG C S, ZHAO G Q, CHEN H, et al. Numerical simulation and metal flow analysis of hot extrusion process for a complex hollow aluminum profile[J]. The International Journal of Advanced Manufacturing Technology, 2012, 60(1): 101-110.
【7】易杰, 朱必武, 李落星. 铝合金车门内板挤压铸造工艺优化的有限元模拟[J]. 机械工程材料, 2014, 38(5): 89-94.
【8】王冠, 何芯, 李落星, 等. 6063铝合金挤压型材尺寸超差分析及模具优化设计[J]. 机械工程材料, 2013, 37(7): 85-89.
【9】王春艳, 谢兰生, 陈国亮. 超薄TB8钛合金半球成形工艺的有限元模拟[J]. 机械工程材料, 2012, 36(11): 102-105.
【10】李光振, 孙颖迪, 陈秋荣, 等. 基于HyperXtrude的镁型材挤压数值模拟与模具优化研究[J]. 热加工工艺, 2014, 43(13): 118-120.
【11】黄光杰, 赵国丹. AZ31镁合金热变形规律的研究[J]. 重庆工学院学报, 2006, 20(2): 60-65.
【12】孙述利, 张敏刚, 周俊琪. AZ31镁合金热压缩过程中的变形行为[J]. 机械工程材料, 2010, 34(8): 88-91.
【13】孙朝阳, 栾京东. AZ31镁合金热变形流动应力预测模型[J]. 金属学报, 2012, 48(7): 853-861.
【14】余琨, 史褆, 王日初. AZ31镁合金变形行为的热力模拟[J]. 中南大学学报, 2008, 39(2): 216-221.
【15】JONAS J J, SELLARS C M, TEGART W J. Strength and structure under hot-working conditions[J]. International Materials Reviews, 1969, 14(1): 1-24.
【16】王火生, 傅高升, 陈永禄, 等.铝锰镁合金热压缩变形的流变应力曲线与本构方程[J].机械工程材料, 2014, 38(5): 95-98.
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