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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(英文),2018,47(10):3030~3037.[Luo Haijun,Jie Wanqi,Zheng Yongjian,WU Menghuai and 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.]
Numerical simulation for macrosegregation in the 3D ingot of Al-4%Cu aluminum alloy during direct-chill casting based on three-phase model
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Received:March 07, 2018  Revised:April 04, 2018
DOI:
Key words: Three phase model  macrosegregation  numerical simulation  three dimensional ingot  direct-chill casting
Foundation item:国家重点基础研究发展计划项目(2016YFF0101301)
Author NameAffiliation
Luo Haijun,Jie Wanqi,Zheng Yongjian,WU Menghuai and Gao Zhiming  
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Abstract:
      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.