Microstructure and Wear Resistance of Plasma Arc Surfacing WC Reinforced Nickel-Based Surfacing Layer

In order to study the influence of WC with different conetent on the microstructure and properties of Ni-based alloy surfacing layer, the Ni-based alloy surfacing layer with different WC contents was prepared on Q235 steel plate by plasma surfacing.The phase, microstructure, Vickers hardness and wear resistance of the surfacing layer were analyzed.The results show that:after adding WC with different contents, the main phases in the surfacing layer are γ-Ni, M₂₃C₆, M₆C, Cr₇C₃, WC, W₂C and FeNi₃ phase.When the WC content is 30wt%, the eutectic structure in the middle of the surfacing layer changes from lamellar to massive, and the Vickers hardness distribution of the surfacing layer is relatively stable, with an average value of 767.2HV0.5, and the minimum wear loss at room temperature is 3.9 mg.The wear mechanism of the surfacing layers at room temperature is mainly delamination wear, and the surfacing layer with 30wt%WC has the smallest delamination damage.