Powder metallurgy processes – Powder metallurgy processes with heating or sintering – Post sintering operation
Patent
1992-10-07
1995-05-09
Walsh, Donald P.
Powder metallurgy processes
Powder metallurgy processes with heating or sintering
Post sintering operation
419 14, 419 15, 419 55, 419 29, 419 38, 419 46, 419 47, B22F 300
Patent
active
054137527
ABSTRACT:
Fatigue crack growth-resistant articles are made from powder metal or cast and wrought gamma prime precipitation strengthened nickel-base superalloy material, wherein a relatively high predetermined minimum strain rate, .epsilon..sub.min, is employed during hot working at or near the alloy's recrystallization temperature; or alternatively a relatively high strain level, .epsilon..sub.min, is employed during cold or warm working at temperatures below the alloy's recrystallization temperature. The worked articles are characterized by a uniform fine grain size, and grains which coarsen uniformly after heating at the supersolvus solutioning temperature, thereby alleviating non-uniform grain growth within the material.
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Kissinger Robert D.
Menzies Richard G.
Paxson Allen J.
Sauby Michael E.
General Electric Company
Jenkins Daniel
Narciso David L.
Squillaro Jerome C.
Walsh Donald P.
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