Heat treatment of cobalt base alloys

Details Heat treatment of cobalt base alloys Heat treatment of cobalt base alloys

1974-10-01

1977-01-18

Dean, R.

Metal treatment

Compositions

Heat treating

75171, 148 325, 148158, C22F 102

Patent

active

040037657

ABSTRACT:
Cobalt based alloy containing 5% to 30% Ni; 18% to 25% Cr; 5% to 17% of at least one of W, Ta and Mo; 0.10% to 0.30% C; 50 ppm to 200 ppm B; 0 to 0.3% Fe; 0 to 2% Mn; 0 to 1% HF; 0 to 1% La; 0 to 1% Y; 0.5% to 2% in total of Ti and/or Nb, the balance being Co; and a heat treatment for such alloy comprising solution heat treatment in a protective atmosphere at 1150.degree. C to 1250.degree. C for at least 1 hour, rapid cooling, and then age hardening for from 12 to 24 hours at from 750.degree. C to 850.degree. C to effect carbide precipitation of MC carbides, M being titanium or niobium.

REFERENCES:
patent: 2974037 (1961-03-01), Thielemann
patent: 2996379 (1961-08-01), Faulkner
patent: 3418111 (1968-12-01), Herchenroeder

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