Specialized metallurgical processes – compositions for use therei – Compositions – Consolidated metal powder compositions
Patent
1979-09-19
1982-03-23
Hunt, Brooks H.
Specialized metallurgical processes, compositions for use therei
Compositions
Consolidated metal powder compositions
294205, 73226, 73214, 73211, 148126, B22F 300
Patent
active
043210910
ABSTRACT:
A method for producing a powder forged material comprising 1.4.about.3.5% Si, 0.2.about.0.9% Mn and 1.0.about.2.0% C by weight, the remainder substantially consisting of iron is provided herein. This method consists in (a) pulverizing the swarf of an FCD cast iron mother material and separating and removing graphite microparticles from the mother material to produce a powder body of said mother material having a carbon content of 1.0.about.2.5%; (b) preforming the powder body having the reduced carbon content to a density lower than that of the mother material and applying a lubricant to the preformed body; (c) heating the preformed body at a temperature above the melting point of the mother material but below 1300.degree. C. in a non-carburizing atmosphere and then cooling the preformed body until the temperature of the body is lowered to 1000.degree..about.1100.degree. C. and forging the preformed body in a dye so that the specific gravity is the same or slightly higher than that of the mother material and, finally, (d) subjecting the forged body to a diffusion treatment by heating it above the austenitizing temperature. The present invention also relates to forged materials produced by this method.
REFERENCES:
patent: 2301805 (1942-11-01), Harder
patent: 2637671 (1953-05-01), Pavitt
patent: 3381022 (1968-12-01), Walff
patent: 3889350 (1975-06-01), Mocarski
Hirschhorn, J.S., The Forging of Powder Metallurgy Preforms, Metal Forming, 37(11):320-327, Nov. 1970.
Kuroishi Nobuhito
Noji Susumu
Takeda Yoshinobu
Hunt Brooks H.
Sumitomo Electric Industries Ltd.
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