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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。
In order to study the influence of casting process parameters on the temperature field and thermal stress field of the rapid casting and rolling process of AZ31 magnesium alloy sheet, a two-dimensional geometric model of 1/2 longitudinal section was established based on the symmetry of the slab in the casting rolling zone. Elastic-plastic incremental theory of thermal stress control equations; the use of large-scale common finite element analysis software ANSYS rapid cooling process of magnesium alloy casting billet temperature field and thermal stress field were simulated and analyzed for different process parameters (pouring temperature , Contact interface heat transfer coefficient, casting speed) on the distribution of slab temperature and stress and its influence on the phase transition 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.