Convection in the two-phase zone of solidifying alloys |
| |
Authors: | A L Maples D R Poirier |
| |
Affiliation: | (1) General Electric Company, 35807 Huntsville, AL;(2) Department of Metallurgical Engineering, The University of Arizona, 85721 Tucson, AZ |
| |
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. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|