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,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;选择了基于热弹塑性增量理论的热应力控制方程;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(浇注温度、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.
To research the influence of processing parameters on temperature field and thermal-stress in the process of high-speed roll casting of AZ31 magnesium alloy sheet, temperature filed and thermal-stress of the alloy billet in high-speed roll casting process was simulated with ANSYS finite element analysis software.The governing equations of temperature field based on the equivalent specific heat method and thermal-stress based on the elastic-plastic incremental theory were established.The temperature-stress distributions and phase transformation zone in the cast billet under different processing parameters (pouring temperature, heat-transfer coefficients and casting speeds) were obtained.The formation mechanism of hot cracks in billet was di8cussed and the simulated results provided a basis for optimizing the processing parameters of high-speed roll casting of AZ31 magneaium alloy sheet.
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