摘要
Nucleation and growth model based on Cellular Automation(CA) incorporated with macro heat transfer calculation was presented to simulate the microstructure of aluminum twin-roll casting. The dynamics model of dendrite tip (KGT model) was amended in view of characteristics of aluminum twin-roll casting. Through the numerical simulation on solidification structure under different casting speeds, it can be seen that when the casting speed is 1.3 m/min, that is, under conditions of conventional roll casting, coarse columnar grains dominate the solidification structure, and equiaxed grains exist in the center of aluminum strip. When the casting speed continuously increases to 8 m/min, that is, under the conditions of thin-gauge high-speed casting, columnar grains in solidification structure all convert into equiaxed grains. Experimental and numerical results agree well.
Nucleation and growth model based on Cellular Automation（CA） incorporated with macro heat transfer calculation was presented to simulate the microstructure of aluminum twin-roll casting. The dynamics model of dendrite tip （KGT model） was amended in view of characteristics of aluminum twin-roll casting. Through the numerical simulation on solidification structure under different casting speeds, it can be seen that when the casting speed is 1.3 m/min, that is, under conditions of conventional roll casting, coarse columnar grains dominate the solidification structure, and equiaxed grains exist in the center of aluminum strip. When the casting speed continuously increases to 8 m/min, that is, under the conditions of thin-gauge high-speed casting, columnar grains in solidification structure all convert into equiaxed grains. Experimental and numerical results agree well.
出处
《中国有色金属学会会刊：英文版》
EI
CSCD
2008年第4期944-948,共5页
Transactions of Nonferrous Metals Society of China
基金
Project(50564004) supported by the National Natural Science Foundation of China
Project(G2000067208-3) supported by the National Basic Research Program of China
Project(0250020) supported by the Natural Science Foundation of Jiangxi Province, China
关键词
铝
铸造
微观结构
细胞自动机
twin-roll casting
aluminum microstructure
Cellular Automation（CA）
