Nitriding of super alloys for enhancing physical properties

Details Nitriding of super alloys for enhancing physical properties Nitriding of super alloys for enhancing physical properties

1984-06-25

1986-05-13

Brody, Christopher W.

Metal treatment

Compositions

Heat treating

148427, C22F 110

Patent

active

045884501

ABSTRACT:
The invention teaches the improvement of certain super alloys by exposing the alloy to an atmosphere of elemental nitrogen at elevated temperatures in excess of 750.degree. C. but less than 1150.degree. C. for an extended duration, viz., by nitriding the surface of the alloy, to establish barrier nitrides of the order of 25-100 micrometers thickness. These barrier nitrides appear to shield the available oxidizing metallic species of the alloy for up to a sixfold improved resistance against oxidation and also appear to impede egress of surface dislocations for increased fatigue and creep strengths.

REFERENCES:
patent: 4043839 (1977-08-01), Hartline et al.
patent: 4264380 (1981-04-01), Rose et al.

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