Method of forming fatigue crack resistant nickel base superalloy

Details Method of forming fatigue crack resistant nickel base superalloy Method of forming fatigue crack resistant nickel base superalloy

1986-09-15

1989-03-28

Dean, R.

Metal treatment

Compositions

Heat treating

148162, C22F 110

Patent

active

048160849

ABSTRACT:
A method is provided for reducing fatigue crack propagation in nickel base superalloys. The method involves a supersolvus anneal in which essentially all .gamma.' precipitate phase is dissolved. The supersolvus anneal is folloed by slow cooling which is at a rate which substantially reduces time dependent fatigue crack growth but which preserves the strength of the alloy at a useful level for many superalloy applications.

REFERENCES:
patent: 4685977 (1987-08-01), Chang

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