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AZ80镁合金深孔筒形件数值模拟及试验研究
英文标题:Numerical and experimental investigation of deep hole cylindrical component of AZ80 magnesium alloy
作者:李建平 车路长 
单位:重庆电子工程职业学院 中国兵器工业第五九研究所 
关键词:AZ80镁合金 深孔筒形件 数值模拟 显微组织 力学性能 
分类号:TG376.3
出版年,卷(期):页码:2014,39(5):66-72
摘要:
采用Gleeble-1500热模拟试验机得到AZ80镁合金的流动应力-应变曲线,根据应力-应变曲线求得材料热变形的材料常数,基于刚塑性有限元法,对AZ80镁合金的反挤压过程进行数值模拟。分析挤压过程中的载荷-行程曲线以及坯料内部的等效应力、等效应变分布,并就挤压温度和挤压速度对反挤压过程的影响进行分析。根据模拟结果对筒形件进行反挤压试验,分析成形件的显微组织及力学性能。模拟结果表明,镁合金深孔筒形件的最佳反挤压温度为360 ℃,反挤压速度为5 mm·s-1。采用此工艺制备的筒形件表面质量良好,组织得到明显细化,且其抗拉强度、屈服强度与伸长率分别为324 MPa,216 MPa和11%。

The flow stress-strain curves of AZ80 magnesium alloy were obtained on the Gleeble-1500 thermo-mechanical simulator, and the backward extrusion of AZ80 magnesium alloy was simulated numerically based on material constants obtained from flow stress-strain curves and rigid-plastic finite element method. The load-stroke curves during backward extrusion and distribution of effective stress and effective strain of billet interior were analyzed, and the effects of extrusion temperature and velocity on backward extrusion process were also discussed. The backward extrusion tests were carried out based on the simulation results, and the microstructure and mechanical property of formed parts were also discussed. The results show that the optimum backward extrusion temperature and velocity for deep hole cylindrical component of magnesium alloy is 360 ℃ and 5 mm·s-1, respectively. The components prepared by the above process are of very good surface finish and obviously refining microstructure, and the tensile strength, yield strength and elongation of components are 324 MPa, 216 MPa and 11%, respectively.

基金项目:
国防基础科研项目(A1020110013)
作者简介:
李建平(1964-),男,硕士,副教授
参考文献:

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