半固态AZ31流变铸轧温度场数值模拟  

Numerical Simulation of Temperature Field in Semi-solid AZ31 Rheocasting-rolling

作　　者：张莹[1] 徐金华[1] 谢水生[2] 马强[1] 

机构地区：[1]南昌大学机电学院,江西南昌330031 [2]北京有色金属研究总院,北京100088

出　　处：《热加工工艺》2010年第23期55-58,共4页Hot Working Technology

基　　金：国家自然科学基金资助项目(No.51066005No.50804023)

摘　　要：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。Finite element method was used to simulate the temperature field in rheocasting-rolling process of semi-solid AZ31 magnesium alloy.The influence of rheocasting-rolling parameters（convective heat transfer coefficient in roll surface,casting temperature,casting speed） on the quality of magnesium alloy strips was analyzed.The results show that when casting temperature reduces to 897 K,the magnesium alloy complete solidification point is advanced at the heat transfer coefficient of 10000 W·m-2 K-1,the quality of magnesium alloy strips is affected.If casting time is prolonged to 0.465 s,the heat transfer is enhanced between melt and roller,so the center temperature in outlet zone can reach solidification point.

关 键 词：AZ31 半固态 流变铸轧 温度场 

分 类 号：TG244[金属学及工艺—铸造]