Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报(英文版)

Transactions of Nonferrous Metals Society of China

Vol. 18    No. 4    August 2008

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Microstructure of aluminum twin-roll casting based on Cellular Automation
LIU Xiao-bo(刘晓波)1 , XU Qing-yan(许庆彦)2, JING Tao(荆 涛)2, LIU Bai-cheng(柳百成)2

1. College of Mechanical and Electronic Engineering, Nanchang University, Nanchang 330031, China;
2. Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China

Abstract: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.

 

Key words: twin-roll casting; aluminum microstructure; Cellular Automation(CA)

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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