HARD ALLOY FOR SEMI-FINISHING OF HARD-TO-MACHINE MATERIALS Russian patent published in 2024 - IPC C22C29/08 C22C1/51 B23P15/28 

FIELD: powder metallurgy.

SUBSTANCE: invention relates to hard alloys based on tungsten carbide with binder alloyed with rhenium for semi-finishing of hard-to-machine materials. It can be used for processing alloys based on refractory metals, heat-resistant, corrosion-resistant steels and alloys. Tungsten carbide-based hard alloy for semi-finishing of hard-to-machine materials contains tungsten carbide and 8.5 wt.% of binder containing 52–55 wt.% of rhenium, the rest is cobalt. Hardness (H) of the alloy is not less than 89 HRA, ultimate bending strength (σ_out) is not less than 1,274 MPa. Ultimate bending strength and hardness are related to volume content of binder(V_b) and/or carbide phase (V_c) by the following ratios: σ_out=53.0V_b[vol. %]+936.3=53(100−V_c)[vol. %]+936.3 [MPa]; H=−0.419V_b[vol. %]+93.67=−0.419(100−V_c)[vol. %]+93.67 [HRA].

EFFECT: higher durability of tools during semi-finishing of hard-to-machine materials.

1 cl, 7 tbl, 2 ex