Fe-Cr-Mo-Co-C-B-Nb coatings with the Nb mass fractions of 0, 2, 4 and 6% were prepared on 45 steel by laser cladding. The surface and microstructural evolution, chemical compositions, phases and thermal behavior of the obtained coatings were analyzed using a scanning electron microscope (SEM) equipped with energy disperse spectroscopy (EDS), Electron Probe Microanalyzer (EPMA), x-ray diffraction (XRD), and differential scanning calorimeter (DSC), respectively. The effects of element Nb addition on the glass forming ability (GFA), microhardness and corrosion behavior of coatings were investigated. The results show that the addition of Nb improves the surface properties, corrosion resistance and GFA of the material significantly, but the presence of excessively high Nb elements will generate Nb-Mo phase, which reduces the plasticity of the coating. Besides, by analyzing the properties of the coating, the optimum mass fraction of Nb was determined to be 4%.

通过激光熔覆在45钢上制备Nb质量分数为0、2、4和6％的Fe-Cr-Mo-Co-CB-Nb涂层。使用配备有能量分散光谱仪（EDS），电子探针显微分析仪（EPMA），X射线衍射（XRD）的扫描电子显微镜（SEM）分析获得的涂层的表面和微观结构演变，化学成分，相和热行为。 ，和差示扫描量热仪（DSC）。研究了Nb元素添加量对涂层的玻璃形成能力（GFA），显微硬度和腐蚀行为的影响。结果表明，Nb的添加显着改善了材料的表面性能，耐腐蚀性和GFA，但是过高的Nb元素的存在会生成Nb-Mo相，从而降低了涂层的可塑性。