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近年来变形镁合金得到了广泛的研究和应用,薄板快速铸轧技术为新型变形镁合金提供质量合格的板坯。为了研究铸轧工艺参数对AZ31镁合金薄板快速铸轧过程温度场和热应力场的影响,根据该技术在镁合金中应用的特点,基于铸轧区板坯的对称性建立了纵截面1/2的二维几何模型;选择自由网格划分法和Smart-Sizing算法划分有限元网格;采用大型通用有限元分析软件ANSYS对镁合金快速铸轧过程中的铸坯温度场和热-应力场进行了仿真分析,并就不同工艺参数(接触界面换热系数、铸轧速度)对铸坯温度和应力的分布及其相变区的影响进行了研究。仿真结果增强了对镁合金快速铸轧过程相变区温度变化和热裂产生机制的理解,为快速铸轧工艺参数的优化提供了依据。
In recent years, deformation of magnesium alloy has been widely studied and applied, sheet rapid casting technology for the new deformation of magnesium alloy to provide qualified slab. In order to study the influence of casting process parameters on the temperature field and thermal stress field in rapid casting process of AZ31 magnesium alloy sheet, according to the characteristics of the technology applied to magnesium alloy, based on the symmetry of slab casting zone, 2, the two-dimensional geometric model is selected; the finite element grid is divided by the free mesh method and the Smart-Sizing method; the temperature field and the thermal-stress field of the billet in the rapid casting process of the magnesium alloy are analyzed by the large-scale general finite element analysis software ANSYS The simulation analysis was carried out. The effects of different process parameters (contact surface heat transfer coefficient and casting speed) on the distribution of temperature and stress and the transformation zone were studied. The simulation results enhance the understanding of the temperature change and thermal cracking mechanism of the phase transition zone in the rapid casting process of magnesium alloy, which provides the basis for optimizing the process parameters of the rapid casting process.