【摘要】 镍基碳化钨（WC-Ni）复合材料是常用的激光熔覆材料之一，可有效改善材料表面的耐磨性。但由于碳化钨（WC）属于硬脆材料，受热易分解、溶解、氧化等，导致熔覆层中WC体积分数受限，且涂层容易存在裂纹。因此，当前针对该种材料的激光熔覆研究主要集中于较低的WC含量（质量分数<50%）。为进一步探究高含量WC（质量分数>50%）镍基合金的激光熔覆层性能，首先，以60%WC-Ni粉末为激光熔覆材料，以CCSB钢板为基材，分别研究激光功率、送粉速度、激光扫描速度对熔覆层宽度、高度及稀释率的影响规律；然后，确定合适的熔覆参数组合，并在基材表面加工制备熔覆层；最后，分别对基材和熔覆层进行硬度和摩擦磨损实验测试，结果显示：与基材相比，熔覆层平均硬度达到81.44 HRC，提高了5.45倍；同样时间内摩擦磨损量降低93.6%，摩擦系数降低12.37%，熔覆层的硬度和耐磨性均获得显著提升。更多还原

【Abstract】 WC-Ni matrix composite is one of the commonly used laser cladding materials, it is able to effectively improve the wear resistance of the material surface. However, as WC is a hard and brittle material, it is easy to decompose, dissolve and oxidize when heated, leading to the limited volume fraction of WC in the cladding layer, and the coating is prone to crack. Therefore, the current laser cladding research on this material mainly focuses on the low WC content(mass fraction<50%). In order to further explore the laser cladding properties of high content WC nickel-based alloy(mass fraction>50%), 60%WC-Ni powder was used as laser cladding material, and CCS-B steel plate was used as the base material in this work. The effects of laser power, powder feeding rate and cladding speed on the width, height and dilution rate of the cladding layer were studied respectively. Finally, the appropriate combination of cladding parameters was determined, and the cladding layer was formed on the surface of the substrate. The hardness,friction and wear tests of substrate and cladding layer were carried out respectively, results showed that the average hardness of the cladding layer is 81.44HRC, 5.45 times higher than that of the matrix, the abrasion loss and wear coefficient were reduced by 93.6%and 12.37% in the same time. The hardness and wear resistance of the cladding layer are significantly higher than that of the matrix ascension.更多还原