Abstract
The effect of addition of metallic carbides Cr3C2 and Cr3C2 + VC on structure and mechanical properties of WC-10 wt% Co nanocomposites have been studied. After preparing and compacting of the powders under pressure of 200 MPa, the samples were sintered at temperatures of 1370°C, 1410°C and 1450°C for 1 hour. Microstructural examinations by SEM show that the average grain size obtained for Cr3C2 + VC added alloys reduced 50 percent and also grain size distribution was narrower compared to those samples without grain growth inhibitors. Furthermore, co-addition of Cr3C2 and VC rise to a higher Vickers hardness and fracture toughness of the sintered alloys at 1410°C.
Highlights
WC-Co cemented carbides are consist of large amounts of faceted carbide grains embedded in a ductile binder and due to their remarkable mechanical properties such as high hardness, high wear resistance and high temperature strength are one of the most important materials for cutting and mining tools [1,2]
Microstructural examinations by SEM show that the average grain size obtained for Cr3C2 + VC added alloys reduced 50 percent and grain size distribution was narrower compared to those samples without grain growth inhibitors
WC-Co hard materials can be densified by liquid phase sintering and mechanical properties of these materials depend on their composition and microstructure the average grain size and size distribution of WC grains [4]
Summary
WC-Co cemented carbides are consist of large amounts of faceted carbide grains embedded in a ductile binder and due to their remarkable mechanical properties such as high hardness, high wear resistance and high temperature strength are one of the most important materials for cutting and mining tools [1,2]. It has shown that improvement of mechanical properties of cemented carbide alloys mainly relies on proper using of grain growth inhibitors and development of the appropriate microstructure and grain sizes through sintering process [2]. In WC-Co cemented carbide alloys, improvement of mechanical properties has been studied by addition of various grain growth inhibitors in the alloys. We report the effect of addition of amounts of Cr3C2 and Cr3C2-VC and various sintering temperatures in H2 atmosphere. These parameters effect on microstructure and mechanical properties of WC-%10wt Co alloys and obtain fine WC grains and improve hardness and fracture toughness
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