발간논문

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Vol.36, No.5, 768 ~ 776, 1998
Title
Analysis of Microsegregation in Al - Cu Alloy Weld Metal
박준민 , 윤의박 , 이창희 Jun Min Park , Eui Pak Yoon , Chang Hee Lee
Abstract
A previously developed two dimensional model was applied to predict the degree of microsegregation in weld metal. In the model, both primary and secondary arm regions were defined for the analysis region. For the growth of a secondary arm, a simple and effective mathematical function was introduced to show the growing pattern(polynomial interface). The solute diffusion in the solid phase was calculated by finite difference method (FDM). The solid-liquid interface movement was considered to be in local equilibrium state indicated by the phase diagram. The experiments for the weld metal solidification of 2024 Al alloy were carried out in order to examine the reasonability and feasibility cf this model. The concentration profile of the solute and Eutectic fraction predicted by the simulation agreed well with that found from experimental works. According to the results, it was believed that the pattern function introduced in this study be reasonable for the prediction of any binary systems which may or may not have an eutectic reaction.
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