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利用有限元方法对AZ31镁合金在半固态双辊铸轧成形工艺中的温度场进行了数值模拟。分析了铸轧工艺参数(轧辊表面对流换热系数、浇铸温度、浇铸速度)对镁合金板带质量的影响。结果表明,在浇铸温度降低到897K时,在10000W.m-2 K-1换热系数下镁合金熔体完全凝固点的位置前移,影响镁合金板带的质量;而将铸轧时间延长到0.465s可以加强熔体和铸辊换热,使得出口区域中心温度达到凝固点。
The finite element method was used to simulate the temperature field of AZ31 magnesium alloy in semi-solid twin roll casting process. The influence of casting process parameters (roll surface convective heat transfer coefficient, casting temperature, casting speed) on the quality of magnesium alloy strip was analyzed. The results show that when the casting temperature is reduced to 897K, the position of complete solidification point of magnesium alloy is shifted forward under the condition of 10000W.m-2 K-1 heat transfer coefficient, which affects the quality of magnesium alloy strip. 0.465s can strengthen the heat transfer between the melt and the casting roller, making the center of the outlet area reach the freezing point.