【摘要】 以WC-Ni基硬质合金为研究对象，采用扫描电子显微镜（SEM）、X射线衍射（XRD）、力学性能和电化学性能测试技术研究了不同碳添加量（0,0.1%,0.2%）对WC-9%Ni-1.5%Cr硬质合金的微观组织、物相分布、力学性能和耐腐蚀性能的影响。结果表明：碳添加量对合金的粒径大小影响不大，WC平均粒径基本一致且合金处于WC和fcc-Ni两相区。随着碳含量的增加，WC-9%Ni-1.5%Cr硬质合金的硬度和耐腐蚀性能呈现先下降后上升的趋势，而合金的密度和断裂韧性呈现先上升后下降的趋势。当碳含量为0.1%时，合金的密度（14.31 g/cm³）、硬度（1 790HV30）和断裂韧性(9.97 MPa·m^1/2)达到最佳平衡，且此时其在酸性环境中耐腐蚀性能最好。更多还原

【Abstract】 With WC-Ni cemented carbides as the research objects, the effects of different carbon additions（0, 0.1%,and 0.2%） on the microstructure, phase distribution, mechanical properties, and corrosion resistance of WC-9Ni-1.5Cr cemented carbides were studied by scanning electron microscopy（SEM）, X-ray diffraction（XRD）, and mechanical and electrochemical property tests. The results show that the carbon addition has little effect on the particle size of cemented carbides, and the average particle size of WC is basically the same. In addition, the cemented carbides are in the two-phase zone of WC and fcc-Ni. With the increase in carbon content, the hardness and corrosion resistance of WC-9%Ni-1.5%Cr cemented carbides show a trend of decreasing first and then increasing. However, the density and fracture toughness show a trend of increasing first and then decreasing. When the carbon addition is 0.1%, the density（14.31 g/cm³）, hardness（1 790 HV30）, and fracture toughness(9.97 MPa·m^1/2) of WC-9%Ni-1.5%Cr cemented carbides reach the best balance, and the corrosion resistance in an acidic environment is the best at this time.更多还原