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为了研究工艺参数对AZ31镁合金直接激冷铸造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作了一些简化和假设;建立了镁合金铸锭横截面的二维几何模型;建立了基于非稳态热传递的温度场和热弹塑性增量理论的热应力控制方程;根据铸造过程中的传热特点确定了一冷区和二冷区的边界条件和初始条件;采用大型通用有限元分析软件ANSYS 对镁合金直接激冷铸造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)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直接激冷铸造过程热裂产生机制的理解,为直接激冷铸造工艺参数的优化提供了依据。
In order to study the effect of process parameters on the temperature field and thermal stress field in direct chill casting process of AZ31 magnesium alloy, some simplifications and assumptions were made according to the characteristics of the technology applied to magnesium alloy. A two-dimensional The thermal stress control equations of temperature field and thermo-elastic plastic increment theory based on unsteady heat transfer are established. The boundary conditions and initial conditions of a cold zone and a secondary cold zone are determined according to the heat transfer characteristics in the casting process The temperature field and thermal-stress field of billet during direct chill casting of magnesium alloy were simulated and analyzed by the use of large-scale and general finite element analysis software ANSYS. The distribution of temperature and stress of billet with different process parameters (pouring temperature) And the influence of its phase transition zone are studied. The simulation results enhance the understanding of the mechanism of the thermal cracking in the direct chill casting of magnesium alloy and provide the basis for the optimization of the process parameters of direct chill casting.