(大连理工大学 材料科学与工程学院，
三束材料改性国家重点实验室， 大连 116024)
摘 要: 通过有限差分法， 利用Visual C＋＋ 6.0建立直接水冷法(DC)AZ31镁合金连铸过程的数学模型， 该模型可预测铸锭以及底模的温度分布。 通过对铸造过程物理现象的理论研究， 确定一冷区、 二冷区以及铸锭与底模之间的边界条件。 通过与文献实测温度的比较， 证明该模型可以用来模拟实际铸造过程。 考察不同铸造条件对铸锭温度场分布的影响， 为优化镁合金直冷连铸的工艺参数提供了依据。
关键字: 镁合金； 连铸； 温度场； 数值模拟
（State Key Laboratory of Materials Modification by Laser,
Ion and Electron Beams, School of Materials Science and Engineering,
Dalian University of Technology, Dalian 116024, China）
Abstract: A mathematical model of DC casting process for magnesium billets was developed to predict the temperature in the billet and dummy block using Microsoft Visual C++ 6.0 and finite difference method (FDM). The boundary conditions used for primary and secondary cooling and interfacial cooling between the billet and dummy block were defined based on the basic physical phenomena during the casting process. By comparing the predicted results with the measured data in the literature, it is proved that the programmed model can be used to investigate the casting process. The effects of the casting parameters on the billet temperature distribution were studied, which is helpful to optimize the casting recipe.
Key words: magnesium alloy; direct chill casting; temperature field; numerical simulation
