Fatigue resistant nickel superalloy

Details Fatigue resistant nickel superalloy Fatigue resistant nickel superalloy

1980-01-28

1982-04-20

Dean, R.

Metal treatment

Compositions

Heat treating

75170, 75171, C22C 1903

Patent

active

043257569

ABSTRACT:
Disclosed is a nickel base alloy of the gamma-gamma prime type, the composition of which is controlled, to provide a gamma matrix phase in which solid solution hardener elements are minimized, to less than 12.5 weight percent. Preferably, the alloy consists essentially by weight percent of 0.25-9Al, 1-4Ti, 2-6Cb, 0.01-0.1C, at least one material selected from the group consisting by weight percent of 0-6Co, 0-6Mo, 2-7.5Cr, 0-2.5Hf and mixtures thereof, balance nickel. The gamma prime fraction in a heat treated article is in the range 10-45 volume percent. The stacking fault energy is preferably in the range 80-120 ergs/cm.sup.2. A gas turbine engine disc made of the material exhibits a three fold increase in fatigue life in the 550-750.degree. C. range, as compared to discs made of typical superalloys in current use, while retaining comparable tensile and stress rupture strength.

REFERENCES:
patent: 2071645 (1937-02-01), McNeil
patent: 3810754 (1974-05-01), Ford et al.
patent: 3972745 (1976-08-01), Yamagishi

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