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US 4,226,644 AGranted
High gamma prime superalloys by powder metallurgy
AssigneeUnited Technologies Corporation
InventorsArthur R. Cox, Romeo G. Bourdeau, Paul R. Holiday
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Abstract
A series of superalloy compositions are described, which when processed according to a described processing sequence, produce homogeneous superalloy articles which contain an exceptionally high amount of the gamma prime phase. These alloys contain large amounts of aluminum and chromium and hence are quite oxidation resistant. The processing sequence includes rapid solidification to suppress the formation of the low melting eutectic phases which would otherwise occur.
Claims10
A method of fabricating an oxidation resistant nickel superalloy article including the steps of:
- a. providing an alloy consisting of 7-12% Al, 0-5% Ti, 7-15% Cr, 0-6% Ta, 0-6% Cb, 0-12% W, 0-10% Mo, 0-5% Hf, 0-0.5% C, 0-0.1% B, 0-0.1% Zr, 0-0.5% Y, balance nickel;
- b. melting the alloy;
- c. solidifying the alloy into particulate form at a rate in excess of 10.sup.4 .degree. F./sec. which is sufficient to suppress the formation of low melting eutectic phases;
- and
- d. compacting the solidified particulate form an article;
- and whereby the incipient melting temperature of the alloys and the elevated temperature mechanical properties of the alloy are increased and so that a more uniform distribution of elements throughout the alloy as obtained resulting in an increased volume fraction of the gamma prime phase being present and in improved oxidation resistance.
3 more elements
Dependencies are inferred from the claim text.