Specialized metallurgical processes – compositions for use therei – Compositions – Loose particulate mixture containing metal particles
Patent
1978-09-26
1981-04-21
Lewis, Michael L.
Specialized metallurgical processes, compositions for use therei
Compositions
Loose particulate mixture containing metal particles
75203, 75237, 75241, 75242, 75255, B22F 100
Patent
active
042630460
ABSTRACT:
A workpiece of alloy steel is produced by sintering under a nonoxidizing atmosphere a mass of malleable-iron powder admixed with a comminuted complex ferroalloy. The latter, obtained from a molten mixture of several simple high-carbon ferroalloys saturated with graphite, is a blend of at least three nonferrous metals and iron in carbide form, including a complex carbide of formula M.sub.7 C.sub.3 containing iron and manganese with the possible addition of chromium and another carbide of formula M'.sub.2 C/M'C containing molybdenum with the possible addition of vanadium and/or niobium. The carbidically bound carbon amounts to at least 4%, by weight, of the ferroalloy composition and may constitute between 10% and 60% of the carbon of the sinterable powder mixture to which elemental carbon may be added as graphite. As the mass of iron and ferroalloy particles compacted under high pressure is sintered at temperatures between about 1150.degree. and 1300.degree. C., the carbides lose their identity as their metals diffuse into the soft iron along with the carbon.
REFERENCES:
patent: 3655365 (1972-04-01), Holtz, Jr.
patent: 3746518 (1973-07-01), Holtz, Jr.
patent: 3982924 (1973-08-01), Perfect
Translation of Swedish Patent No. 165,837.
Fichte Rudolf
Jervis Richard
Radel Gunter
Retelsdorf Hans-Joachim
GfE Gesellschaft fur Elektrometallurgie mit beschrankter Haftung
Lewis Michael L.
Ross Karl F.
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