High density forming process with powder blends

Details High density forming process with powder blends High density forming process with powder blends

1997-11-14

2000-11-07

Jenkins, Daniel J.

Powder metallurgy processes

Powder metallurgy processes with heating or sintering

Controlled cooling after sintering

B22F 324

Patent

active

061432407

ABSTRACT:
A method for making a high density powdered metal article is provided. In one embodiment, the composition consists of iron based powder, lubricant, graphite and ferro alloy additions. Satisfactory results may also be achieved by using fully prealloyed grades of metal powders, substantially pure powder blends, fully prealloyed powder blends, partially prealloyed powder blends and powder blends containing ferro alloys. The composition is compacted in rigid tools at ambient temperature, sintering at high temperature greater than 1100.degree. C. and then formed in rigid tools at 40 to 90 tons per square inch to a density greater than 94% of theoretical. The high density article is then annealed. The final article demonstrates remarkable mechanical properties which are atypical of powdered metal components and approach those of wrought steel.

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A. Salak: "Ferrous Powder Metallurgy" 1995, Cambridge Int. Science Publ., GB XP002095777 (pp. 287-294).
R.M. German: "Powder Metallurgy of Iron & Steel" 1998, John Willey & Sons, Inc. USA, CA XP002095778 (pp. 326-336).

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