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RESEARCH PAPERS: Heat Transfer in Materials Processing

Convective Transport Phenomena and Macrosegregation During Solidification of a Binary Metal Alloy: I—Numerical Predictions

[+] Author and Article Information
P. J. Prescott

Department of Mechanical Engineering, The Pennsylvania State University, University Park, PA 16802

F. P. Incropera

Heat Transfer Laboratory, School of Mechanical Engineering, Purdue University, West Lafayette, IN 47907

J. Heat Transfer 116(3), 735-741 (Aug 01, 1994) (7 pages) doi:10.1115/1.2910929 History: Received March 01, 1993; Revised September 01, 1993; Online May 23, 2008

Abstract

A continuum model is used to simulate transient convective transport phenomena numerically during solidification of a Pb-19 percent Sn alloy in an experimental test cell. Solidification occurs in an axisymmetric, annular mold of stainless steel, cooled along its outer vertical wall. Results show that, during early stages of solidification, double-diffusive convection and liquid exchange between melted and mushy zones are responsible for the formation of channels in the outer periphery of the ingot, which ultimately lead to a form of macrosegregation known as A-segregates. During intermediate stages of solidification, solutally driven natural convection spawns a cone segregate in the interior region of the ingot. The final macrosegregation pattern is characterized, in general, by increasing Sn concentration with increasing height throughout the ingot and by increasing Sn concentration with decreasing radius in the upper portion of the ingot.

Copyright © 1994 by The American Society of Mechanical Engineers
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