Peculiarities of Preparation and Properties of Cemented Carbide WC + 20 Mass% Ni with Ultra-Coarse-Grained Microstructure

Abstract

The influence of the conditions of original components mixing and sintering temperatures on the peculiarities of microstructure formation of the cemented carbide WC + 20 mass% Ni prepared of ultra-coarse-grained (80/40 μm) tungsten carbide particles is investigated. The metallographic analysis shows that for the formation of such hard alloy microstructure, it is sufficient to use liquid phase sintering and preliminary economical wet mixing of WC with Ni powder. The strength under bending and compression is 1530 and 1720 MPa, respectively, the density is 13.51 g/cm³, and the hardness is 76 HRA. For the first time, the compressive stress-compression strain curve for this alloy with an average carbide grain size of 20 μm is experimentally obtained. The alloy plasticity is 6 times higher than that of the alloys prepared under other technological modes.