为了研究稳态磁场对激光熔注硬质颗粒强化涂层显微组织和性能的影响, 在316L不锈钢基体上制备了碳化钨(WC)颗粒分布可控的强化涂层。借助扫描电子显微镜(SEM), 能谱仪(EDS)和X射线衍射仪(XRD)等表征手段对激光熔注层进行微观组织和物相分析, 利用维氏硬度计测试了激光熔注涂层截面显微硬度分布, 通过摩擦磨损实验研究复合涂层的磨损性能。结果表明, 熔注涂层物相主要由γ(Fe-Ni)固溶体、WC、W2C和Fe3W3C组成。在稳态磁场辅助下, 涂层的平均硬度为510 HV0.3; 涂层的摩擦系数为0.7, 较未添加稳态磁场的涂层降低了30%, 耐磨性能得到明显改善。

In order to study the influence of steady magnetic field on the microstructure and properties of strengthened coating, the WC/316L metal-matrix coating was prepared by laser melt injection(LMI)under a steady magnetic field. The microstructure and phase composition of the coating were analyzed by means of scanning electron microscopy(SEM), X-Ray diffraction(XRD)and energy dispersive spectrometer(EDS). The cross-section microhardness of LMI layer was measured by Vickers hardness tester, and the abrasion performance of the LMI layer was characterized through the friction coefficient. The results show that the phases of the LMI coatings are mainly composed of γ(Fe-Ni) solid solution, WC, W2C and Fe3W3C. The average microhardness of the coating is 510HV0.3.The friction coefficient of the coating with the steady magnetic field is 0.7, which is lower than that of coating without steady magnetic field. The wear resistance of the LMI coating is improved significantly.