High density tungsten-nickel-iron-cobalt alloys having improved

Details High density tungsten-nickel-iron-cobalt alloys having improved High density tungsten-nickel-iron-cobalt alloys having improved

1987-07-30

1988-08-09

Lechert, Jr., Stephen J.

Specialized metallurgical processes, compositions for use therei

Compositions

Consolidated metal powder compositions

75246, 419 28, 419 29, 419 32, 419 38, 419 39, 419 54, 419 55, 419 58, C22C 2704

Patent

active

047625597

ABSTRACT:
A tungsten-nickel-iron-cobalt high density alloy having unexpected improved strength and hardness properties and the method of making such alloy are disclosed. The alloy has from about 85-98% by weight tungsten with the remainder being a nickel-iron-cobalt binder in which the cobalt is present in amounts of from at least about 5% up to 47.5% by weight of the binder and the amount of cobalt being equal to or less than the amount of nickel. After the powders of the elements in the indicated amounts are homogeneously blended, compacted into a shape and sintered, the sintered shape is subjected to a heat treatment in a flowing argon atmosphere for a period of time and at a temperature at least sufficiently high to solubilize the intermetallic or .mu. phase, Co.sub.7 W.sub.6, formed at the matrix to tungsten interface during cooling from the sintering temperature, and to diffuse into the gamma austenitic phase, thus leaving the alpha tungsten/gamma austenite boundaries substantially or essentially free of such intermetallic or .mu. phase. The alloy is subsequently subjected to a swaging step resulting in a reduction in area of from 5 to 40% and then may be aged for about an hour within the range of about 300.degree.-600.degree. C.

REFERENCES:
patent: 3888636 (1975-06-01), Sczerzemie et al.
patent: 3979209 (1976-09-01), Snyder
patent: 3979239 (1976-09-01), Northcutt et al.
patent: 3988118 (1976-10-01), Grierson et al.

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