Numerical Study of the Influence of Diffusion-Governed Growth Kinetics of Ternary Alloy on Macrosegregation

Abstract:

This article is to assess the modeling treatment of the growth kinetics (finite or infinite diffusion in liquid and solid phases) during solidification and its influence on the calculation of macrosegregation. A model of diffusion-governed growth kinetic for ternary alloy is developed and used for this assessment. Solidification of a 2D casting (50 x 50 mm²) of a ternary alloy (Fe-0.45 wt.% C-1.06 wt.%Mn) is considered. The result shows that finite diffusion in liquid, important for the initial stage of solidification, plays very important role in the formation of macrosegregation. Moreover, the role of the finite diffusion kinetics in the formation of macrosegregation shows differently in the two extreme cases of solidification structures (columnar or equiaxed).

• Periodical: Materials Science Forum (Volumes 790-791)
• Pages: 85-90
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.790-791.85
• Online since: May 2014
• Authors: Meng Huai Wu*, Abdellah Kharicha, Andreas Ludwig
• Keywords: Diffusion, Flow, Gravity, Macrosegregation, Microsegregation, Solidification Path

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