Metal treatment – Process of modifying or maintaining internal physical... – With casting or solidifying from melt
Patent
1996-11-08
1998-08-04
Phipps, Margery
Metal treatment
Process of modifying or maintaining internal physical...
With casting or solidifying from melt
148410, 148538, C22F 110
Patent
active
057887853
ABSTRACT:
The present invention relates to a method for making a gamma prime precipitation strengthened nickel base alloy having an improved resistance to hydrogen embrittlement, particularly crack propagation. The alloy is cast, heat treated to dissolve substantially all the gamma-gamma prime eutectic islands and script carbides without causing incipient melting, cooled to below 1000.degree. C., HIP'ed to eliminate porosity, precipitation treated and aged. The alloy has a microstructure which is essentially free of script carbides, gamma-gamma prime eutectic islands and porosity. The microstructure further includes a plurality of regularly occurring large barrier gamma prime precipitates and a continuous field of fine cuboidal gamma prime precipitates surrounding the large barrier gamma prime precipitates.
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Biondo Charles M.
DeLuca Daniel P.
Jones Howard B.
Rhemer Chris C.
Phipps Margery
United Technology Corporation
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