用常规激光重熔和添加纳米SiC颗粒后的激光重熔分别对等离子喷涂铁基WC涂层进行表面处理，采用扫描电子显微镜观察试样表面及截面的微观形貌，采用电镜附带的能谱仪对涂层与基体界面处的元素分布进行检测，采用X射线衍射仪对涂层的相成分进行分析，并对涂层表面的残余应力进行计算，最后利用显微硬度计测量了涂层不同深度处的显微硬度。结果表明：在激光重熔和纳米SiC的耦合作用下，涂层内的孔隙、裂纹等微观缺陷得以改善，CrSi2、Cr7C3等硬质合金相增加，并生成新相Fe2Si、CrSi；涂层表面的残余应力由363.4 MPa降低到158.6 MPa，显微硬度由631 HV提高到了1195 HV。

The plasma spraying Fe-based WC coating is treated by conventional laser remelting and laser remelting with addition of nano SiC. The surface morphology and cross-section morphology are observed by scanning electron microscopy, and the distribution of the elements at the interface of three coating are analyzed by energy dispersive spectroscopy. The phase composition of the coatings are analyzed by X-ray diffractometer, the surface residual stress is calculated and the microhardness in different depths of the coatings is measured. The results show that pores, cracks, and other micro-defects in plasma spraying coating are improved under the action of laser melting and nano SiC, the content of CrSi2, Cr7C3, and other hard alloy phase increase, and new phases such as Fe2Si and CrSi generate. The surface residual stress reduces from 363.4 MPa to 158.6 MPa, and the microhardness increases from 631 HV to 1195 HV.