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罗海军,介万奇,高志明,郑永健.铸造参数对2024铝合金半连铸过程中宏观偏析影响的数值模拟研究[J].稀有金属材料与工程(英文),2019,48(9):2759~2767.[luohaijun,Jie Wanqi,Gao Zhiming and Zheng Yongjian.Effects of casting parameters on macrosegregation in 2024 alloy during direct-chill casting based on numerical simulation[J].Rare Metal Materials and Engineering,2019,48(9):2759~2767.]
Effects of casting parameters on macrosegregation in 2024 alloy during direct-chill casting based on numerical simulation
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Received:April 09, 2018  Revised:August 08, 2018
Key words: Casting parameters  direct-chill casting  macrosegregation  numerical simulation  2024 Alloy
Foundation item:国家自然基金国际合作项目;国家重点研究发展项目
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luohaijun,Jie Wanqi,Gao Zhiming and Zheng Yongjian  
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      The extended continuum mixture model with considering the floating grains motion was applied to calculate the macrosegregation of large-size billet of 2024 aluminum alloy during direct-chill (DC) casting. Transport equations of mass, momentum, species and heat were solved simultaneously with the Scheil-Gulliver micro-model. The effects of casting parameters (e.g. billet size, casting speed, casting temperature and intensity of secondary cooling zone) were calculated in nine cases. Influence of the transport mechanisms for macrosegregation formation dependent on casting parameters were discussed in detail. Our study demonstrated that the processing parameters directly impacted the shape and dimension of the sump, thereby affecting the final segregation patterns. The billet size and casting speed played the mostly important roles. A larger billet size usually means a slower cooling rate, a deeper and wider sump, which results in the severer segregation in the billet center. The sump depth dramatically increases with the increase of the casting speed. Therefore, higher casting speed promotes greater macrosegrgation. Nevertheless, the sump depth increases slightly with increasing of casting temperature.