METHOD OF DETERMINING STRENGTH AND HARDNESS OF MATERIALS Russian patent published in 2024 - IPC G01N3/40 

FIELD: measurement.

SUBSTANCE: invention relates to the study of mechanical properties of materials, in particular to determination of ultimate strength in transverse bending (σ_bend[MPa]) and hardness (H [HRA]) of hard alloys consisting of tungsten carbide and cobalt-rhenium binder, intended for processing of hard-to-machine materials. Ultimate strength at transverse bending (σ_bend) is determined, for this purpose, destructive force is applied to the middle of the sample lying on two supports, and measuring it, then measuring Rockwell hardness on scale HRA (H) of samples of hard alloys with different content of carbide and binder and different composition of binder, correlation dependence is established between σ_bend and H and volumetric content of binder (V_bn) and/or carbide phase (V_C) functionally related to alloy composition. Binder density (ρ_bn) is determined by additivity rule: ρ_bn=(cρ_Re+dρ_Co)/100, where c and d are the content of rhenium and cobalt in the binder, wt.%, ρ_Re and ρ_Co is density of rhenium and cobalt, with subsequent determination of volume content of binder V_bn and/or carbide phase V_C and then ultimate strength in transverse bending (σ_bend) and hardness (H) by dependencies.

EFFECT: possibility of predicting properties of hard alloys consisting of tungsten carbide WC and binder (Re+Co).

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