FIELD: metallurgy.
SUBSTANCE: invention relates to methods for producing tool hard alloys with a particularly fine-grained structure, where the grain size of less than 0.5 microns is more than 50% and can be used for the manufacture of tools for processing difficult-to-cut alloys and steels. The method for producing superfine-grained hard alloy includes mixing hard alloy charge powders, combined wet grinding, drying, dry mixing of graphene powder and charge, pressing and sintering. Graphene is first mechanically activated for 5-15 minutes with iron nanoparticles added to its surface at a concentration of 0.5-2% by weight of graphene, and graphene is added in an amount of 0.01-0.099% by weight of the charge. Sintering is carried out with isothermal exposure for 25-30 minutes.
EFFECT: high strength characteristics are obtained and maintained.
1 cl, 1 dwg, 2 tbl, 1 ex
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