Specialized metallurgical processes – compositions for use therei – Compositions – Consolidated metal powder compositions
Patent
1983-10-13
1985-12-03
Lieberman, Allan M.
Specialized metallurgical processes, compositions for use therei
Compositions
Consolidated metal powder compositions
75236, 419 14, 419 18, C22C 3804, C22C 3808, C22C 3818
Patent
active
045564248
ABSTRACT:
A powder metallurgy composite material comprising grains of a relatively hard material and a binder for binding the grains together, the binder being metastable and transformable at ambient temperature by the application of mechanical force from an initial state in which the major phase of the binder is austentic to a second state in which the major phase of the binder is martensitic, whereby the binder, while undergoing this transformation, absorbs mechanical energy applied to the composite material for increasing its fracture toughness and resistance to fatigue crack nucleation and propagation. Also disclosed is a method of heat-treating the composite materials to improve their transformation-toughening characteristics. A heat-treatable composite material having such improved transformation-toughening properties is also disclosed.
REFERENCES:
patent: 2731711 (1956-01-01), Lucas
patent: 3369891 (1968-02-01), Tarkan et al.
patent: 3859085 (1975-01-01), Kimura et al.
patent: 4180401 (1979-12-01), Frehn
patent: 4410490 (1983-10-01), Ray et al.
Lieberman Allan M.
Reed Rock Bit Company
Rowold Carl A.
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