Metal treatment – Process of modifying or maintaining internal physical... – With casting or solidifying from melt
Patent
1994-08-18
1996-12-17
Simmons, David A.
Metal treatment
Process of modifying or maintaining internal physical...
With casting or solidifying from melt
148677, 419 29, 419 28, C22F 110
Patent
active
055849474
ABSTRACT:
A method is provided for obtaining uniform grain growth within .gamma.' precipitation strengthened nickel-base superalloys provided in powder metal or cast and wrought form. The method includes alloying the nickel-base superalloy to contain a minimum calculated amount of carbon which, when finely dispersed within the alloy using suitable processing methods, yields a sufficient amount of carbide phase which restricts the grain boundary motion of the alloy during supersolvus heat treatment. When appropriately processed, the grains are not permitted to grow randomly during supersolvus heat treatment, making possible a microstructure whose grain size is uniform, having a grain size range of about 2 to about 3 ASTM units and being substantially free of random grain growth in excess of about 2 ASTM units coarser than the desired grain size range.
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Chang, K. M. and Fiedler, H. C. Conference: Superalloys 1988 "Spray Formed High Strength Superalloys" pp. 485-493.
Huron Eric S.
Kissinger Robert D.
Paxson Allen J.
Raymond Edward L.
General Electric Company
Hess Andrew C.
Narciso David L.
Phipps Margery S.
Simmons David A.
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