Metal treatment – Process of modifying or maintaining internal physical... – Treating consolidated metal powder – per se
Patent
1994-10-17
1996-06-25
Andrews, Melvyn
Metal treatment
Process of modifying or maintaining internal physical...
Treating consolidated metal powder, per se
148677, 148556, 419 28, 419 29, 419 67, C22F 110
Patent
active
055296432
ABSTRACT:
A method is provided for obtaining uniform grain growth within .gamma.' precipitation strengthened nickel-base superalloys. The method includes forming a billet having a very fine grain size in order to achieve optimum superplasticity of the superalloy during forging. The article is then heated to a pre-working hold temperature in a manner which prevents coarsening of the microstructure and a loss of superplasticity. The article is then worked, such as by forging, at a temperature below the .gamma.' solvus temperature of the alloy, so as to maintain local strain rates within the article below a critical strain rate for random grain growth, and so as to maintain the strain rate gradient throughout the article below a critical upper limit. After working, the article is subjected to annealing at a temperature which is less than the .gamma.' solvus temperature of the alloy, and for a duration which is sufficient to remove accumulated metallurgical strain in the article. A supersolvus heat treatment is then performed by further heating the article to a temperature above the .GAMMA.' solvus temperature of the superalloy for a duration sufficient to uniformly coarsen the grains of the article.
REFERENCES:
patent: 4957567 (1990-09-01), Krueger et al.
patent: 5393483 (1995-02-01), Chang
patent: 5413752 (1995-05-01), Kissinger
Benz Mark G.
Blankenship Charles P.
Henry Michael F.
Huron Eric S.
Murut Aldo E.
Andrews Melvyn
General Electric Company
Hess Andrew C.
Narciso David L.
Phipps Margery S.
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