발간논문

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Vol.34, No.10, 1346 ~ 1353, 1996
Title
Research Paper - Solidification - : Modeling of Solidification and Microstructure Formation in Hypereutectic Al - Si Alloy with Numerical Analysis
이재상Jae Sang Lee, 나형용Hyung Yong Ra
Abstract
A numerical analysis of solidification process of hypereutectic Al-Si alloy was performed by microscopic modeling of solidification which incorporates nucleation and growth kinetics. Examining the solidification characteristics of hypereutectic Al-Si alloy, growth kinetics of equiaxed primary Si phase and eutectic phase was considered by linear growth kinetics and modified Jackson-Hunt theory respectively. Conventional macroscopic soldification model (enthalpy method) in which unique relationship of temperature and solid fraction assumed was compared with present model in the situation of conventional mold casting and gas atomization of Al-20wt%Si alloy. Latent heat difference of primary phase and eutectic phase and nucleation-growth kinetics of present model resulted in more realistic cooling curves. Some useful information about thermal history was presented from the inspection of the cooling curve. It is also demonstrated that calculated results and growth kinetics can be related with microstructural characteristic scales of the solidified alloys in good agreement.
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