Effect of Cr3C2 Addition Amount on Microstructure and Mechanical Properties of Ultrafine Grained WC-6%Co Cemented Carbide
In this paper,the effects of Cr3C2 addition amount on the particle size,morphology,and mechanical properties of ultrafine grained WC-6%Co-(0～1.0%)Cr3C2 cemented carbide were studied by X-ray diffraction(XRD),scanning electron microscopy(SEM),and property detection.The results show that the average grain size of WC decreases rapidly at first and then slowly with the increase in the Cr3C2 addition amount.The addition of 0.25%Cr3C2 induces the anisotropic growth of WC grains,and the morphology of WC grains is a quasi-triangular prism.With the increase in the Cr3C2 addition amount,the morphology of WC grains becomes more regular and finally becomes a triangular prism.With the increase in the addition amount of Cr3C2,the hardness of ultrafine grained WC-6%Co-Cr3C2 cemented carbide first increases rapidly and then slowly,but the fracture toughness gradually decreases,and the bending strength first increases and then slowly decreases.When 0.6%Cr3C2 is added,the comprehensive performance of WC-6%Co cemented carbide is the best,and its Vickers hardness,bending strength,and fracture toughness are 18.42 GPa,3 450 Mpa,and 9.32 MPa·m1/2,respectively.
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