C - Chemistry – Metallurgy – 22 – C
Patent
C - Chemistry, Metallurgy
22
C
18/1120, 75/5
C22C 1/04 (2006.01) B22F 3/10 (2006.01) C22C 33/02 (2006.01)
Patent
CA 1095678
METHOD OF PRODUCING A FORGED ARTICLE FROM PREALLOYED-PREMIXED WATER ATOMIZED FERROUS ALLOY POWDER ABSTRACT OF THE DISCLOSURE A method of making powder metal compacts having a Low but optimized alloy content, the compacts being char- acterized by improved response to heat treatment (harden- ability) and improved physical characteristics. A ferrous- based powder is prepared having a predetermined particle size (about -80 mesh), a low O2 content (less than .25%), a predetermined particle shape, less than .04% carbon and balanced pre-alloyed ingredients (.2-1.0% nickel, .2-.8% Mo, and .25-.6% Mn). A nonferrous based powder having at least a high content of copper (-320 mesh if pure copper or about -200 mesh if alloyed copper) is admixed with the prealloyed ferrous based powder to achieve a Cu content of .2-2.1% in the resulting sintered material. Graphite powder is also admixed (.1-1.0% of admixture) to provide a carbon content of at least .17%, but up to .65% in the sintered material; the graphite is preferably a naturally occurring crystalline flake with up to 4.5% max. of ash. The admixture is compacted to form a preform having a green density of about 6.4 g/cm and the same weight as the intended forged product but with greater length and reduced width. The preform is ready to be sintered in a low O2 potential furnace at between 2050-2500°F and subsequently hot forged at about 1800°F under a force of 50 to 100 tons/in2.
281049
Hall Daniel W.
Mocarski Stanislaw
Ford Motor Company Of Canada Limited
Sim & Mcburney
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