Convection in the two-phase zone of solidifying alloys

A. L. Maples, D. R. Poirier

Research output: Contribution to journalArticle

63 Scopus citations

Abstract

The analysis is applicable to alloy solidification which proceeds horizontally to the center of a mold. The model follows the growth of the solid-liquid zone adjacent to the chill face (the initial transient), the movement of the zone across the mold, and the region of final solidification adjacent to the centerline (the final transient). During solidification the density of the liquid varies across the twophase zone. Consequently, there is natural convection which is treated as flow through a porous medium. The equations for convection are coupled with the equation of solute redistribution between the phases in order to calculate macrosegregation after solidification is complete. Results were computed for alloys which show: (1) "inverse segregation≓ at a cooled-surface; (2) macrosegregation resulting from solidification with the initial transient, a period with a complete two-phase zone, and a final transient; and (3) macrosegregation when the width of the two-phase zone exceeds the semi-width of the mold.

Original languageEnglish (US)
Pages (from-to)163-172
Number of pages10
JournalMetallurgical Transactions B
Volume15
Issue number1
DOIs
StatePublished - Jan 1984

ASJC Scopus subject areas

  • Engineering(all)

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