Internal nitridation of cobalt-base superalloys

Details Internal nitridation of cobalt-base superalloys Internal nitridation of cobalt-base superalloys

1976-05-24

1977-08-23

Satterfield, Walter R.

Metal treatment

Compositions

Heat treating

148 166, 75171, C21D 156

Patent

active

040438392

ABSTRACT:
A method of internally nitriding and thereby strengthening cobalt-base superalloys having at least 33% cobalt, up to 0.15% carbon, no more than 25% nickel and from 1 to 3% of nitride forming elements from the group consisting of titanium, vanadium, niobium, tantalum and zirconium. The method comprises the steps of: heating the cobalt-base alloy at a temperature of from 1600.degree. to 2500.degree. F in a nitrogen-bearing atmosphere substantially free of moisture and oxygen, and diffusing nitrogen from said atmosphere into and throughout said alloy for a period of time sufficient to form nitrides having an interparticle spacing of less than 10 microns.

REFERENCES:
patent: 3432294 (1969-03-01), Wheaton
patent: 3642546 (1972-02-01), Van Thyne et al.
patent: 3804678 (1974-04-01), Kindlimann

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