Metal treatment – Process of modifying or maintaining internal physical... – With casting or solidifying from melt
Patent
1994-09-19
1996-12-17
Simmons, David A.
Metal treatment
Process of modifying or maintaining internal physical...
With casting or solidifying from melt
148514, 148675, 419 2, 419 12, 419 28, 419 42, C22F 110
Patent
active
055849482
ABSTRACT:
A method is provided for reducing the tendency for thermally induced porosity within a .gamma.' precipitation strengthened nickel-base superalloy which has been processed to obtain a uniform and coarse grain microstructure. This method is particularly useful for forming components such as gas turbine compressor and turbine disk assemblies in which optimal mechanical properties, such as low cycle fatigue and creep resistance, are necessary for operating at elevated temperatures within a gas turbine engine. The method generally entails alloying a .gamma.' precipitation strengthened nickel-base superalloy to have a boron content of not more than about 0.02 weight percent, and then forming a billet by melting an ingot of the superalloy in an argon gas atmosphere and atomizing the molten superalloy using argon gas. The above atomizing technique encompasses both powder metallurgy and spray forming processes.
REFERENCES:
patent: 4047933 (1977-09-01), Larson et al.
patent: 4140528 (1979-02-01), Hebeisen et al.
patent: 4719080 (1988-01-01), Duhl et al.
patent: 4888064 (1989-12-01), Chang
patent: 4957567 (1990-09-01), Krueger et al.
patent: 5061324 (1991-10-01), Chang
patent: 5143563 (1992-09-01), Krueger et al.
patent: 5393483 (1995-02-01), Chang
"The Spray Forming of Superalloys" by H. C. Fieldler, T. F. Sawyer, R. W. Kopp and A. G. Leatham Journal of Metals Aug. 1987 pp. 28-33.
Garosshen et al., "Effects of B, C, and Zr on the Structure . . . Superalloy", met. Trans.; vol. 18 A (Jan. 1987) pp. 69-77.
Hack et al., "Comparison of Nimonic Alloy . . . Solvus"; Proc. of the Metal Powder Report Conf. (Nov. 18-20, 1980); pp. 20-1-20-50.
General Electric Company
Hess Andrew C.
Narciso David L.
Phipps Margery S.
Simmons David A.
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