大直径AZ80镁合金热模锻有限元分析

摘要

运用Pro/Engineer进行三维造型和建模,结合Deform-3D有限元软件对大直径764 mm AZ80镁合金锻件的热模锻过程进行模拟,分析模具温度对锻件的温度分布、等效应力分布以及上模载荷曲线的影响.根据模拟结果制备大尺寸AZ80镁合金锻件,并采用扫描电子显微镜(SEM)和力学性能测试,分析锻件不同部位的显微组织和力学性能.研究结果表明:当模具温度为350℃时,锻件的成形性最好;当模具温度为250℃和300℃时,锻件的等效应力和上模载荷较大;当模具温度为400℃和450℃时,锻件的局部温度将会超过400℃,容易产生过烧,均不利于加工;锻件中不同位置的流线方向与第2相分布方向一致;在损伤值较小的区域,合金具有更高的强度和伸长率.%The hot die forging process of φ 764 mm AZ80 magnesium alloy was simulated by Pro/engineer three-dimensional modeling and Deform-3D finite element software. The forging temperature, effective stress and load-stroke were analyzed under different mold temperatures. According to the simulation results, the large size of AZ80 magnesium alloy was obtained. The microstructures and mechanical properties of different parts of the forging were analyzed by scanning electron microscope(SEM) and mechanical property test. The results show that forging can be made when the mold temperature is 350 ℃. The effective stress value and load-stroke are greater when the mold temperatures are 250 ℃ and 300 ℃, respectively. The forging temperature is more than 400 ℃ when the mold temperatures are 400 ℃and 450 ℃, respectively, which makes it easy to burn off. The streamline directions of the different positions in the forging are consistent with those of the distribution of the second phase. The alloy has higher strength and elongation rate when the damage value is less.