Hw. Huang et al., SIMULATION OF DIRECTIONAL SOLIDIFICATION WITH STEEP THERMAL-GRADIENTS, Modelling and simulation in materials science and engineering, 4(3), 1996, pp. 245-259
The convection and macrosegregation predicted by a simulation of a dir
ectionally solidified binary alloy (Pb-23.2 wt%Sn) are presented, and
the simulated macrosegregation is compared with the macrosegregation i
n an experimental casting. The casting was solidified at a rate of 6 m
u m s(-1) and a thermal gradient of approximately 7.2 x 10(3) K m(-1);
such thermal gradients are much greater than those previously simulat
ed. The calculated results showed channels at the vertical casting sur
faces and segregated internal pockets in the mushy zone, in agreement
with the observation of freckles in the experimental casting.