High carbon, high density forming

Details High carbon, high density forming High carbon, high density forming

1997-06-19

1999-12-07

Jenkins, Daniel J.

Powder metallurgy processes

Powder metallurgy processes with heating or sintering

Post sintering operation

419 38, 419 28, 419 29, B22F 324

Patent

active

059978058

ABSTRACT:
A manufacturing method is provided for the production of high density, high carbon, sintered powder metal steels. The composition consists of iron based powder, graphite, lubricant, and possibly at least one alloying element from the group of chromium, copper, manganese, molybdenum, nickel, niobium or vanadium. The composition is compacted in rigid tools, sintered and during cooling an isothermal or slow cooling treatment is introduced between 650.degree. C. and 750.degree. C. The isothermal or slow cooling treatment may alternatively be applied during a heat treatment cycle that is carried out after a conventional sintering cycle. The material processed as described may then be formed to high density. Forming to high density is not practical with high carbon materials that have been processed by conventional methods. The high density article is then heat treated in a manner to suit specific product requirements. The mechanical properties achieved by the claimed process offer significant benefits when compared to conventionally processed sintered powder metal articles.

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Database WPI Section Ch, Week 8847 Derwent Publications Ltd., London, G.B. Class M22, AN 88-336390 XP002082034 May 15, 1988.

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