Thermomechanical processing for fatigue-resistant nickel based s

Details Thermomechanical processing for fatigue-resistant nickel based s Thermomechanical processing for fatigue-resistant nickel based s

1990-04-02

1991-10-29

Andrews, Melvyn J.

Metal treatment

Compositions

Heat treating

148 115P, 148 127N, C22F 110

Patent

active

050613243

ABSTRACT:
Thermomechanical processing treatments for powder compacts formed from powdered superalloy compositions having a volume fraction of gamma prime greater than 35 percent are disclosed. Isothermal forging within critical ranges of strain rate and temperature is followed by supersolvus annealing and slow cooling treatments. An enlarged grain structure about 50 to 60 microns in size is produced that improves resistance to fatigue crack propagation in the superalloys.

REFERENCES:
patent: 4814023 (1989-03-01), Chang

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