Controlled thermal expansion superalloy

Details Controlled thermal expansion superalloy Controlled thermal expansion superalloy

1994-11-22

1995-12-26

Kastler, Scott

Metal treatment

Stock

Ferrous

148442, 420586, C22C 3800

Patent

active

054784174

ABSTRACT:
The invention provides a controlled coefficient of thermal expansion alloy having in weight percent about 26-50% cobalt, about 20-40% nickel, about 20-35% iron, about 4-10% aluminum, about 0.5-5% niobium plus 1/2 of tantalum weight percent and about 1.5-10% chromium. Additionally the alloy may contain about 0-1% titanium, about 0-0.2% carbon, about 0-1% copper, about 0-2% manganese, about 0-2% silicon, about 0-8% molybdenum, about 0-8% tungsten, about 0-0.3% boron, about 0-2% rhenium, about 0-2% hafnium, about 0-0.3% zirconium, about 0-0.5% nitrogen, about 0-1% yttrium, about 0-1% lanthanum, about 0-1% total rare earths other than lanthanum, about 0-1% cerium, about 0-1% magnesium, about 0-1% calcium, about 0-4% oxidic dispersoid and incidental impurities. The alloy may be further optimized with respect to crack growth resistance by annealing at temperature below about 1010.degree. C. or temperatures between 1066.degree. C. or 1110.degree. C. and the melting temperature and by aging at a beta precipitation temperature greater than about 788.degree. C.

REFERENCES:
patent: 4685978 (1987-08-01), Smith et al.
patent: 4908069 (1990-03-01), Doherty et al.
patent: 5169463 (1992-12-01), Doherty et al.
patent: 5283032 (1994-02-01), Wanner et al.

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