铝合金凝固过程中传热系数的数值求解及二次枝晶间距预测  

Numerical Resolution of Heat Transfer Coefficient and Prediction of Secondary Dendrite Arm Spacing

作　　者：武跃维[1] 张蓉[1] 张利民[1] 陈文静[1] 

机构地区：[1]西北工业大学理学院

出　　处：《特种铸造及有色合金》2011年第2期126-128,201,共3页Special Casting & Nonferrous Alloys

基　　金：西北工业大学研究生创业种子基金资助项目(Z2010082)

摘　　要：以A357合金为研究对象,利用反运算,即试验温度曲线与模拟冷却曲线有限元对比耦合的方法,计算了在空冷和水冷条件下铸件/铸型间传热系数与冷却时间的关系,获得了精确的边界条件。在此基础上,对合金凝固过程中的冷却行为以及二次枝晶间距的分布进行模拟,并与试验结果进行对比。结果表明二者相符合。Based on finite element inverse calculation method,relationship between heat transfer coefficient of A357 aluminum alloy casting/mold at air and water cooling conditions and cooling time were described,and precision boundary condition was presented.By applying the results,cooling behavior of the A357 aluminum alloy during solidification process and distribution of secondary dendrite arm spacing in the microstructure were simulated.The simulated results are well in agreement with experimental ones.

关 键 词：A357合金 数值模拟 传热系数 二次枝晶间距 

分 类 号：TG292[金属学及工艺—铸造] O242.1[理学—计算数学]