발간논문

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Vol.34, No.3, 359 ~ 366, 1996
Title
Research Paper - Solidification - : Computer Simulation of Dendritic Grain Structures in Planar Flow Casting
이경이Kyong Yee Lee, 안재영Jae Young Ahn, 홍준표Chun Pyo Hong
Abstract
A numerical model has been proposed for the prediction of crystalline microstructure formation in planar flow casting. The present model is based on the coupling of the control volume(CV) method for macroscopic heat flow calculations and a two-dimensional cellular automaton(CA) model for microstructural evolution in solidification. The CA model takes into account nucleation, preferential crystallographic orientation and growth kinetics of a dendrite. At high solidification velocity, the LKT model with growth rate dependent partition coefficient was introduced to describe the growth kinetics of a dendrite which grows from an undercooled alloy melt. At every interval of time, the latent heat released by the solidifying cells after growth stage in the CA model was fed back into the CV model in order to calculate the temperature distribution for the next interval of time. The present model has been applied to predict the resultant microstructures of Al-Cu polycrystalline ribbons spun by planar flow casting. The calculated grain structures were compared with those of experiments.
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