Abstract:The WC‒Cu‒10Ni‒5Mn‒3Sn cemented carbide doped with Cr ₃C ₂was prepared by pressureless melt infiltration at 1210 ℃ for 1.5 h, the effect of Cr ₃C ₂dopant (0.0, 0.2%, 0.4%, 0.6%, 0.8%, and 1.0%, mass fraction) on the microstructure and mechanical properties of the WC‒Cu‒10Ni‒5Mn‒3Sn alloys was investigated. The results show that during the infiltration process, the WC particles partially decompose with the addition of Cr ₃C ₂, the Ni ₂W ₄C and Cr ₇C ₃appear in the alloys, and the (W,Cr)C _xand (Cr,W)C are formed from Cr ₇C ₃and W produced by the decomposition of WC. The emergence of new phases causes the change in WC grain size, thereby altering the mechanical properties of the alloys. With the mass fraction increase of Cr ₃C ₂, the hardness and flexural strength show the trend of first increasing and then decreasing. When the mass fraction of Cr ₃C ₂is 0.4% and 0.6%, respectively, the hardness and flexural strength reach the maximum, which is HRA 93.1 and 1720 MPa, respectively. The addition of Cr ₃C ₂is not conducive to the impact toughness, the alloys without Cr ₃C ₂have the highest impact toughness as 4.65 J·cm ^‒2.