Patent ID: 9555471
Date: 2017-01-31
CPC Classifications: B22D,C30B

Claim:
1. A casting method in a casting furnace, the casting furnace comprising a withdrawal region in a lower end, the method comprising: positioning a mold within the casting furnace; positioning a molten material in the mold; partially withdrawing the mold a withdrawal distance through the withdrawal region in the casting furnace, the withdrawal distance providing a partially withdrawn portion, at least partially solidifying the partially withdrawn portion; then reinserting at least a portion of the partially withdrawn portion into the casting furnace through the withdrawal region, at least partially re-melting the partially withdrawn portion; and then completely withdrawing the mold from the casting furnace through the withdrawal region, producing a directionally solidified or single crystal cast article; wherein the reinserting partially re-melts a solidified portion within the partially withdrawn portion to fill pores formed therein with the molten material.