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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 curve of AZ80 magnesium alloy was obtained by Gleeble-1500 thermal simulation tester. The material constants of thermal deformation of the AZ80 magnesium alloy were obtained from the stress-strain curve. Based on the rigid-plastic finite element method, the anti-extrusion process of AZ80 magnesium alloy Numerical Simulation. The load-stroke curve, equivalent stress and equivalent strain distribution in the blank were analyzed. The influence of extrusion temperature and extrusion speed on the anti-extrusion process was analyzed. According to the simulation results of the cylindrical parts of the anti-extrusion test, analysis of the shape of the microstructure and mechanical properties. The simulation results show that the optimal anti-extrusion temperature of magnesium alloy deep-hole cylindrical parts is 360 ℃ and the anti-extrusion speed is 5 mm · s-1. The surface quality of the cylindrical part prepared by this process is good, the microstructure is obviously refined, and its tensile strength, yield strength and elongation are respectively 324 MPa, 216 MPa and 11%.