研究了铌、铬对激光熔覆制备的铁基颗粒增强复合涂层组织和性能的影响。在FeCSiB系熔覆粉末中复合添加Ti、W、Nb、Cr等碳化物形成元素，通过激光熔覆制备原位合成颗粒增强复合涂层。研究表明，单独及复合添加铌、铬均能获得显微硬度均匀分布且成形良好的熔覆层。通过改变铌和铬的含量和配比可以有效改变颗粒相的分布情况。单独添加铌时，熔覆层显微硬度随着铌含量的增加先减小后增大；单独添加铬时，随着铬含量的增大，熔覆层显微硬度呈下降趋势。抗冲击磨损性能与材料的韧性有关，微米级碳化物颗粒对涂层抗冲击磨损性能的提高并没有促进作用。

The influences of Nb and Cr on the microstructure and properties of the Fe-matrix laser clad composite coating reinforced by in situ particles are studied of Ti, W, Nb and Cr with different contents and ratios adding into the FeCSiB cladding powder, and in situ particle reinforced Fe-matrix composite coating is produced by laser cladding. It reveals that clad layers with good forming and homogeneous microhardness distribution are produced by adding Nb and Cr other separately or simultaneously. The particle distribution can be influenced by the contents of Nb and Cr efficiently. The microhardness of the layers increases firstly and then decreases with the content of Nb increasing, and decreases with the content of Cr increasing. The impact wear resistance is related to the toughness of the material. The micron carbide particles will not improve the impact wear resistance of the particle reinforced composite coating.