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RESEARCH PAPERS: Heat Transfer in Materials Processing

Convective Transport Phenomena and Macrosegregation During Solidification of a Binary Metal Alloy: II—Experiments and Comparisons With 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 Lafayettte, IN 47907

D. R. Gaskell

School of Materials Engineering, Purdue University, West Lafayettte, IN 47907

J. Heat Transfer 116(3), 742-749 (Aug 01, 1994) (8 pages) doi:10.1115/1.2910930 History: Received March 01, 1993; Revised September 01, 1993; Online May 23, 2008

Abstract

Experiments involving the solidification of a Pb-19 percent Sn alloy in an axisymmetric, annular mold of stainless steel are performed, and results are compared with numerical predictions. Agreement between measured and predicted cooling curves is reasonable, although undercooling and recalescence, which occur in the experiments, are not predicted by the model. Measured temperatures also indicate that dendrite fragments are transported throughout the mold cavity during early stages of solidification, and convection patterns similar to those predicted by numerical simulation can be inferred from the measurements. While there is general agreement between measured and predicted trends for macrosegregation, the numerical simulation, which assumes axial symmetry, cannot predict the inherently three-dimensional nature of solute redistribution. Conclusions drawn from temperature and composition measurements are supported by metallographic examinations of experimental ingot specimens.

Copyright © 1994 by The American Society of Mechanical Engineers
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