Process for the powder metallurgical production of working piece

Details Process for the powder metallurgical production of working piece Process for the powder metallurgical production of working piece

1990-03-05

1991-07-23

Stoll, Robert L.

Stock material or miscellaneous articles

All metal or with adjacent metals

Having metal particles

75236, 75238, 75242, 75244, 428627, 148 115P, 419 13, 419 14, 419 23, 419 31, 419 33, B22F 300

Patent

active

050342827

ABSTRACT:
Process for the powder-metallurgical production of work pieces, particularly tools, containing high-melting point carbides and/or carbonitrides homogeneously distributed in a matrix, in which an amount of elements of the IVa and Va groups, or secondary groups, of the periodic table is adjusted to at least 3 weight percent of the alloy, a low carbon and/or nitrogen concentration is established, and primary precipitates are prevented; and a desired carbon and/or nitrogen content is created by atomization of the melt into powder vaporizing medium. When necessary, it is further created by diffusion annealing of the powder in a medium containing carbon or hydrocarbon compounds and/or nitrogen or nitrogen compounds; and powder with a minimum carbide and/or carbonitride content of 10 percent by volume is processed to produce work pieces in a manner known in the prior art, when necessary after mixing two or more kinds of powders containing different amounts of carbon and nitrogen made according to the process of this invention. Work pieces, particularly tools, produced according to this process have a content of at least two elements selected from the group consisting of vanadium, niobium, titanium, zirconium, hafnium or tantalum, with a carbide and/or carbonitride content of at least 6 percent by volume, and a maximum carbide and/or carbonitride granule size of 5 .mu.m diameter.

REFERENCES:
patent: 4469514 (1984-09-01), Holtz, Jr.
patent: 4609526 (1986-09-01), Haswell et al.
patent: 4639352 (1987-01-01), Kodama et al.
patent: 4885132 (1989-12-01), Brandt et al.
patent: 4891338 (1990-01-01), Gesing et al.
patent: 4911989 (1990-03-01), Minoru et al.
patent: 4935057 (1990-06-01), Yoshimura et al.
patent: 4942097 (1990-07-01), Santhanam et al.
patent: 4944800 (1990-07-01), Kolaska et al.

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