Comparative study of WC-Co-VC-Cr3C2 cemented carbide by spark plasma sintering: densification, microstructure,and mechanical properties
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초록
Ultrafine-grained WC-Co-VC-Cr3C2 cemented carbide was consolidated from homogeneously synthesized powder using sparkplasma sintering at 1300 °C under 60 MPa. The densification behavior of WC-Co-VC-Cr3C2 was determined based on theshrinkage strain with sintering kinetics. As the Cr3C2 addition increased, the secondary (Cr, W)Cx phase was attributed toabnormal grain growth in the basal facet of WC, whereas grain boundary strengthening was induced by the separation of theWC/Co interface with the addition of VC. The mechanical properties of WC-Co-VC-Cr3C2 cemented carbide depend on thegrain size and lattice strain of the hard phase, in contrast to the toughening mechanism, and were correlated with the crackpropagation and fracture resistance. The WC-Co-Cr3C2 cemented carbide with the best combination of mechanical propertieswas found, including a hardness of 1958.9 kg/mm2 and fracture toughness of 7.3 MPa∙m1/2.
Abstract
Ultrafine-grained WC-Co-VC-Cr3C2 cemented carbide was consolidated from homogeneously synthesized powder using sparkplasma sintering at 1300 °C under 60 MPa. The densification behavior of WC-Co-VC-Cr3C2 was determined based on theshrinkage strain with sintering kinetics. As the Cr3C2 addition increased, the secondary (Cr, W)Cx phase was attributed toabnormal grain growth in the basal facet of WC, whereas grain boundary strengthening was induced by the separation of theWC/Co interface with the addition of VC. The mechanical properties of WC-Co-VC-Cr3C2 cemented carbide depend on thegrain size and lattice strain of the hard phase, in contrast to the toughening mechanism, and were correlated with the crackpropagation and fracture resistance. The WC-Co-Cr3C2 cemented carbide with the best combination of mechanical propertieswas found, including a hardness of 1958.9 kg/mm2 and fracture toughness of 7.3 MPa∙m1/2.
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