Method of forming fatigue crack resistant nickel base superalloys

摘要

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.