Internal nitridation of cobalt-base superalloys

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

C - Chemistry, Metallurgy

23

C

148/24

C23C 8/24 (2006.01)

Patent

CA 1046385

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 and tantalum. the method comprises the steps of: heating the cobalt-base alloy at a temperature of from 1600 to 2500°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.

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