B - Operations – Transporting – 22 – D
Patent
B - Operations, Transporting
22
D
22/185
B22D 27/04 (2006.01) C30B 11/00 (2006.01) C30B 21/02 (2006.01)
Patent
CA 1157631
RATE CONTROLLED DIRECTIONAL SOLIDIFICATION METHOD AND APPARATUS ABSTRACT OF THE DISCLOSURE An improved method of directional solidification is provided by varying the rate of withdrawal of a casting from the hot zone of a solidification furnace according to the sense of change of the perimeter to area ratio of the casting. The rates are varied to achieve desired microstructure and resultant properties in the casting. Also, the rate of withdrawal is varied according to controlled and predetermined relationships to cause the solidification interface to move through a transition section connecting sections of differing perimeter to area ratios in a manner which produces a desired micro- structure in a first, transition, and second sections. - 1 -
338296
Swabey Ogilvy Renault
United Technologies Corporation
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