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Simulation of Grain Growth during Solidification of Twin-Roll Continuously Cast Pure Aluminum with a Modified CA Model
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Simulation of Grain Growth during Solidification of Twin-Roll Continuously Cast Pure Aluminum with a Modified CA Model
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The Joint Fund of National Natural Science Foundation of China (u0837601); Natural Science Foundation of China (50874054); Analysis Fundation of Kunming University of Science and Technology (2011015)

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    摘要:

    基于枝晶生長的基本傳輸過程和元胞自動機(jī)(Cellular Automaton，簡稱CA)-有限元(Finite Element，簡稱FE)模型基本原理，建立了適應(yīng)雙輥連續(xù)鑄軋純鋁薄帶工藝特點(diǎn)的凝固過程形核和晶體生長的數(shù)學(xué)模型。模型耦合了宏觀溫度場和微觀組織模擬計(jì)算，考慮了溶質(zhì)擴(kuò)散、曲率過冷和潛熱釋放等重要因素的影響，能夠模擬凝固過程中枝晶生長的形態(tài)。應(yīng)用本模型對雙輥連續(xù)鑄軋純鋁薄帶凝固過程中等軸晶生長、等軸晶多晶粒生長及柱狀晶生長、柱狀晶向等軸晶演化進(jìn)行模擬并與實(shí)驗(yàn)結(jié)果進(jìn)行對比，模擬結(jié)果與實(shí)驗(yàn)結(jié)果吻合較好

    Abstract:

    A new mathematic model for the nucleation and the dendrite growth of twin-roll-continuously cast pure aluminum thin strip during solidification process was developed based on cellular automaton(CA)-finite element(FE) method and the classical transfer equations during dendrite growth. The model coupled the temperature field calculation and microstructure simulation. The solute diffusion, the curvature undercooling and the latent?heat?releasing were also considered in the model, all of which have significant influence on the dendrite evolution. So the dendrite growth morphology can be modeled. The applications of the model in equiaxed dendrite growth, multiple equiaxed dendrite growth, columnar grain growth, and columnar dendrite transformation to equiaxed dendrite in twin-roll-continuously cast aluminum thin strip solidification were presented. The microstructure simulation results were compared with the experimental results and they were in good agreement in dendrite morphology

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陳守東,陳敬超,于 杰. Simulation of Grain Growth during Solidification of Twin-Roll Continuously Cast Pure Aluminum with a Modified CA Model[J].稀有金屬材料與工程,2013,42(12):2462~2466.[Chen Shoudong, Chen Jingchao, Yu Jie. Simulation of Grain Growth during Solidification of Twin-Roll Continuously Cast Pure Aluminum with a Modified CA Model[J]. Rare Metal Materials and Engineering,2013,42(12):2462~2466.]
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  • 收稿日期:2012-12-10
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