Method for treating superalloy castings

Details Method for treating superalloy castings Method for treating superalloy castings

C - Chemistry, Metallurgy

21

D

148/10

C21D 1/74 (2006.01) B22D 31/00 (2006.01) C22F 1/10 (2006.01)

Patent

CA 1040515

ABSTRACT OF THE DISCLOSURE A method for treating superalloy castings wherein the portions of the castings which solidify directly against the mold walls comprise a substantially continuous skin. In such castings, defects in the form of material voids, including defects present immediately beneath the skin, are eliminated by the application of heat and pressure. The castings are heated to temperatures sufficient to achieve metal movement, and a pressure of at least about 10,000 psi is applied by means of a surrounding gaseous atmosphere. The heat and pressure applica- tion collapses the material in the area of the voids and con- solidates this material to substantially remove the voids and to thereby improve the performance characteristics of the castings.

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