AZ91D镁合金流变铸轧的多孔介质数值模拟

Numerical simulation of AZ91D magnesium alloy rheoroll-casting with porous media model

采用多孔介质模型对镁合金流变铸轧进行数值模拟,分析不同浇注温度下铸轧区的温度分布和固相率分布,对比多孔介质模型与纯液态模型之间的差异,并通过实验结果确定最佳模型。结果表明:不同浇注温度下铸轧区内的温度分布和固相率分布规律相似,但完全凝固点的位置不同;对比分析得到最佳浇注温度为840 K,多孔介质模型模拟结果与实验结果高度一致。因此在流变铸轧的数值模拟中,多孔介质模型比纯液态模型更具可靠性。

The porous media model was applied to numerical simulation of magnesium alloy rheoroll-casting,and temperature distribution and solid fraction distribution in casting zone were analyzed under different pouring temperature. The differences between pure liquid model and porous media model were comparatively analyzed,and then the best model can be determined through the experimental results. The results show that under different pouring temperature,temperature distribution and solid fraction distribution are similar,but the positions of the point of complete solidification are distinct. The comparative analysis shows that the optimum pouring temperature is 840 K,and the simulated result of the porous media model is highly consistent with experiment result. Therefore,in the numerical simulation of rheoroll-casting,the porous media model has higher reliability than pure liquid model.