(大連理工大學 材料科學與工程學院，
三束材料改性國家重點實驗室， 大連 116024)
摘 要: 通過有限差分法， 利用Visual C＋＋ 6.0建立直接水冷法(DC)AZ31鎂合金連鑄過程的數(shù)學模型， 該模型可預測鑄錠以及底模的溫度分布。 通過對鑄造過程物理現(xiàn)象的理論研究， 確定一冷區(qū)、 二冷區(qū)以及鑄錠與底模之間的邊界條件。 通過與文獻實測溫度的比較， 證明該模型可以用來模擬實際鑄造過程。 考察不同鑄造條件對鑄錠溫度場分布的影響， 為優(yōu)化鎂合金直冷連鑄的工藝參數(shù)提供了依據(jù)。
關鍵字: 鎂合金； 連鑄； 溫度場； 數(shù)值模擬
（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
