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研究揭示镁合金ECAP复合挤压在等通道内金属的温度演化规律,有助于细化组织和提高型材性能,对推动轻合金型材在汽车领域的应用具有重要意义。基于DEFORM-3D有限元平台,建立了某规格车身用AZ31镁合金型材ECAP复合挤压过程温度场预测有限元模型。研究发现:进入变形区金属温度不断升高,等通道入口处温升最高91℃;金属温度整体沿着等通道不断降低,降幅约为20~26℃;型材中间部位温度高于两翼,且温度分布始终保持一致,最大温差34℃。该结果可为ECAP复合挤压温度精细化控制、型材综合性能提高提供理论基础。
The research reveals that the evolution of the temperature of metal in ECAP in ECAP composite extrusion is helpful to refine the microstructure and improve the properties of the profile, which is of great significance for the application of light alloy profiles in the automotive field. Based on DEFORM-3D finite element platform, a finite element model of temperature field in ECAP compound extrusion process of AZ31 magnesium alloy profile for a certain specification body was established. The results show that the temperature of the metal entering the deformation zone keeps increasing and the temperature rise at the inlet of the isopathic channel reaches 91 ℃. The temperature of the metal decreases continuously along the equal channels with the decreasing rate of about 20-26 ℃. The temperature in the middle part of the profile is higher than that of the two wings, Distribution has always been the same, the maximum temperature difference 34 ℃. The results provide a theoretical basis for the fine control of ECAP extrusion temperature and the comprehensive performance of the profiles.