Process and device for producing sintered parts

Details Process and device for producing sintered parts Process and device for producing sintered parts

1996-06-07

1997-05-06

Jordan, Charles T.

Powder metallurgy processes

Powder metallurgy processes with heating or sintering

Controlled cooling after sintering

417 11, 417 57, 425 78, 432152, 266257, B22F 324

Patent

active

056280459

ABSTRACT:
A process for producing sintered parts with high wear resistance and good dynamic strength properties from formed bodies, which have been pressed as green parts from a completely-alloyed air-hardened heat-treatment steel powder with a carbon content of at least 0.3% added in the form of graphite. The process includes sintering the parts under protective gas at a sintering temperature of at least 1000.degree. C. and subsequent cooling. The sintered parts are cooled immediately after sintering from the sintering temperature to a first holding temperature in the range of Ar.sub.3 to a maximum of 150.degree. C. above Ar.sub.3 and are held for a first holding period of 5 to 25 minutes at this temperature (austenitizing phase). Immediately after this, the sintered parts are cooled in accelerated fashion to a second holding temperature by convective gas cooling and are held at this temperature for a second holding period. The second holding temperature lies in a temperature range in which a bainitic structure forms and is of such a length that a bainitic structure portion of at least 50% is established. The sintered parts are then cooled to room temperature.

REFERENCES:
patent: 4655853 (1987-04-01), Byrnes et al.
patent: 4964908 (1990-10-01), Greetham
patent: 5074533 (1991-12-01), Frantz
patent: 5132080 (1992-07-01), Pfeil
patent: 5312574 (1994-05-01), Yamada et al.

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