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INTERFACIAL THERMAL CONTACT DURING RAPID SOLIDIFICATION ON A SUBSTRATE

G.-X. Wang
Department of Mechanical and Environmental Engineering University of California, Santa Barbara, CA 93106, U.S.A.

E.F. Matthys
Department of Mechanical and Environmental Engineering University of California, Santa Barbara, CA 93106, U.S.A.

Abstract

In processes such as strip casting, a thin layer of molten metal is brought in contact with a colder substrate. The metal/substrate interface heat transfer may then determine the melt cooling rate and solidification velocity, and therefore affects strongly the material properties of the solidified product. As a first step in the systematic study of the interface heat transfer phenomena in those processes, we have performed experiments to quantify the interface heat transfer coefficient when molten metal is solidified on a substrate. The temperature of the solidifying metal is measured at various locations, and an inverse heat transfer model is then used to estimate the variation in interface heat transfer coefficient as a function of time. This coefficient is calculated for a range of superheats and two substrate materials. It is found that large variations in heat transfer coefficient take place before and around nucleation time, but that this coefficient remains about constant starting shortly thereafter.

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