罗海军,介万奇,郑永健,吴孟怀,高志明.基于三相模型的Al-4%Cu合金三维半连铸圆锭的宏观偏析数值模拟[J].稀有金属材料与工程,2018,47(10):3030~3037.[Luo Haijun,Jie Wanqi,Zheng Yongjian,WU Menghuai,Gao Zhiming.Numerical simulation for macrosegregation in the 3D ingot of Al-4%Cu aluminum alloy during direct-chill casting based on three-phase model[J].Rare Metal Materials and Engineering,2018,47(10):3030~3037.]
基于三相模型的Al-4%Cu合金三维半连铸圆锭的宏观偏析数值模拟
投稿时间:2018-03-07  修订日期:2018-04-04
中文关键词:  三相模型  宏观偏析  数值模拟  三维圆锭  半连铸
基金项目:国家重点基础研究发展计划项目(2016YFF0101301)
中文摘要:
      本文采用基于 Eulerian-Eulerian方法的等轴晶、柱状晶以及熔体三相完全混合的凝固模型计算了三维半连铸Al-4%Cu铝合金圆锭的宏观偏析。基于热溶质对流的基础上,模型考虑了等轴晶的移动,以及柱状晶对浮游等轴晶的捕获,等轴晶和柱状晶的相互竞争生长行为。模拟结果表明铸锭底部出现了明显的锥形负偏析区(CET转变区域),铸锭中心正偏析带,毗邻中心的负偏析区,以及铸锭1/2半径处正偏析带,总的偏析形态呈现W型,与铸锭实际情况基本一致。此外,铸造速度相较于浇注温度对铸锭宏观偏析具有更大的影响。
Numerical simulation for macrosegregation in the 3D ingot of Al-4%Cu aluminum alloy during direct-chill casting based on three-phase model
英文关键词:Three phase model  macrosegregation  numerical simulation  three dimensional ingot  direct-chill casting
英文摘要:
      A mixed three-phase solidification model based on Eulerian-Eulerian approach and volume average method for macrosegregation is applied to predict segregation in three dimensional ingot of Al-4%Cu aluminum alloy during direct chill casting (DC). In addition to the thermosolutal buoyancy flow, we consider the movement of equiaxed crystal, the capture of the equiaxed crystals by growing columnar tree trunks and the interaction and impingement between columnar and equiaxed crystals in the model. The results show that the cone zone of negative segregation is obviously observed at the bottom of ingot. Negative segregation is also observed adjacent to the center, whereas positive segregation obtained in the center and middle part of the radius. This W-type segregation profile is agreement with measured experimental data obtained from literatures. At the same time, the influence of pouring temperature and casting speed on macrosegregation are studied. It indicates that casting speed has a greater impact on segregation.
作者单位E-mail
罗海军 西北工业大学材料学院 lhj273@163.com 
介万奇 西北工业大学材料学院  
郑永健 Simulation and Modeling of Metallurgical Processes,University of Leoben,A-,Austria  
吴孟怀 Simulation and Modeling of Metallurgical Processes,University of Leoben,A-,Austria  
高志明 西北工业大学材料学院  
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