Channel Convection and Formation of Freckles

S. D. Felicelli, P. K. Sung, D. R. Poirier


In this paper, the initiation of a channel was investigated with two-dimensional simulations of the solidification of a Ni-base superalloy. It was observed that channels started at the top of the mushy zone, became somewhat deeper for a short period while the front advanced, and then stayed "behind"
as the front continued upward. This process was helped by remelting; i.e., the channel partially melted downward from the front and deeper into the mushy zone.

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