Thermomechanical method of forming fatigue crack resistant nicke

Details Thermomechanical method of forming fatigue crack resistant nicke Thermomechanical method of forming fatigue crack resistant nicke

1986-09-15

1988-12-27

Dean, R.

Metal treatment

Compositions

Heat treating

148 127N, C22F 110

Patent

active

047938684

ABSTRACT:
A method has been discovered for reducing fatigue crack growth in nickel base superalloys. The method involves the step of forming a part to near net shape by forging or by other forming technique. The part is then heat treated to develop regular grains by recystallization. Grains of about 35 .mu.m average diameters are prepared. The part is then deformed at least 15% to achieve a net shape desired.

REFERENCES:
Improving Crack Growth Resistance of IN718 Alloy Through Thermomechanical Processing, by K.-M. Chang, Metallurgy Laboratory, Corporate Research and Development, General Electric Company, Schenectady, New York, Report No. 85CRD187, Oct. 1985.

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