Numerical simulation for macrosegregation in direct-chill casting of 2024 aluminum alloy with an extended continuum mixture model
基于拓展连续模型的2024铝合金半连铸过程中的宏观偏析数值模拟（英文）作者机构：State Key Laboratory of Solidification Processing Northwestern Polytechnical University Xi＇an 710072 China Chair of Simulation and Modeling of Metallurgical Processes Montan Universitaet Leoben 8700 Leoben Austria
出 版 物：《Transactions of Nonferrous Metals Society of China》 (中国有色金属学报（英文版）)
年 卷 期：2018年第28卷第5期
页 面：1007-1015页
核心收录：
学科分类：080503[工学-材料加工工程] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0802[工学-机械工程] 080201[工学-机械制造及其自动化]
基 金：Project(51420105005)supported by the Major International(Regional)Joint Research Program of National Natural Science Foundation of China Project(2016YFF0101301)supported by the National Key Research and Development Program of China
主 题：direct-chill casting macrosegregation numerical simulation continuum model 2024 aluminum alloy
摘 要：An extended continuum mixture model for macrosegregation is applied to predicting Cu and Mg segregation in large-size ingot of 2024 aluminum alloy during direct chill casting（DC）. A microsegregation model using the approximate phase diagram data was coupled with macroscopic transport equations for macrosegregation profiles. Then, the impacts of transport mechanisms on the formation of macrosegregation were discussed. It is found that copper and magnesium have a similar segregation configuration from the billet center to surface. Negative segregation is observed in the centerline and subsurface, whereas positive segregation is obtained in the surface and somewhat underestimated positive segregation in the middle radius. Further, the discrepancy between the predicted and experimental results was discussed in detail. The results show that the magnesium to some extent alleviates the copper segregation in ternary alloy, compared with that in binary alloy. The predicted results show good agreement with measured experimental data obtained from literatures.
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