Cobalt alloy heat treatment

Details Cobalt alloy heat treatment Cobalt alloy heat treatment

1977-12-27

1979-05-01

Dean, R.

Metal treatment

Process of modifying or maintaining internal physical...

Chemical-heat removing or burning of metal

75171, 148 325, C22C 1907

Patent

active

041521811

ABSTRACT:
A stabilization heat treatment for a class of wrought cobalt alloys is described. The heat treatment produces a useful combination of initial ductility, so as to permit fabrication of intricate parts, and adequate ductility even after long term exposure at elevated temperatures as, for example, that exposure encountered in gas turbine service. The heat treatment consists of a solution treatment performed at elevated temperatures followed by two aging steps at lower temperatures. The nominal alloy composition is 22.5% chromium, 4.25% aluminum, 15% (nickel+iron), 3% (tantalum+columbium), 10% (tungsten+molybdenum), 1.25% hafnium, 0.05% yttrium, 0.35% carbon, balance essentially cobalt.

REFERENCES:
patent: 3366478 (1968-01-01), Wheaton
patent: 3432294 (1969-03-01), Wheaton
patent: 3615375 (1971-10-01), Beltran et al.
patent: 3718461 (1973-02-01), Dewey
patent: 4078922 (1978-03-01), Magyar et al.

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