High-temperature fatigue-resistant nickel based superalloy and t

Details High-temperature fatigue-resistant nickel based superalloy and t High-temperature fatigue-resistant nickel based superalloy and t

1990-04-02

1995-02-28

Walsh, Donald P.

Powder metallurgy processes

Powder metallurgy processes with heating or sintering

Metal and nonmetal in final product

419 11, 419 29, 419 49, 148514, 148677, 148410, 148428, 75252, 75254, 420448, B22F 300, C22C 1905

Patent

active

053934830

ABSTRACT:
A nickel based superalloy composition is disclosed that provides increased high temperature stress-rupture strength and improved resistance to fatigue crack propagation at elevated temperatures up to about 760.degree. C. The composition is comprised of, by weight percent, about 10% to 12% chromium, about 17% to 19% cobalt, about 1.5% to 3.5% molybdenum, about 4.5% to 6.5% tungsten, about 3.25% to 4.25% aluminum, about 3.25% to 4.25% titanium, about 2.5% to 3,5% tantalum, about 0.02% to 0.08% zirconium, about 0.005% to 0.03% boron, less than 0.1% carbon, and the balance essentially nickel. Thermomechanical processing including isothermal forging at controlled strain rates and temperature ranges, supersolvus annealing, and slow cooling are disclosed for producing an enlarged grain structure that provides the improved properties in the alloy of this invention.

REFERENCES:
patent: 3850702 (1974-11-01), Buchanan
patent: 3975219 (1976-08-01), Allen et al.
patent: 4685977 (1987-08-01), Chang
patent: 4793868 (1988-12-01), Chang
patent: 4816084 (1989-03-01), Chang
patent: 4820353 (1989-04-01), Chang

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