中文摘要：

采用激光熔覆技术,在Q235钢基体上制备了高熵合金SiFeCoCrTi涂层,并研究了WC颗粒对高熵合金涂层的组织及性能的影响。通过OM,XRD,SEM,硬度试验,磨损试验等手段探究了高熵合金涂层的微观形貌,相结构,硬度及磨损性能。结果表明,高熵合金SiFeCoCrTi涂层组织为胞状树枝晶,主要由bcc相和金属间化合物构成。添加WC后,涂层中形成了致密细小的枝状晶,而且形成了大量的金属间化合物,如TiCo3、Co1.07Fe18.93。同时WC添加使得基材的稀释率降低,涂层的性能明显提高,其涂层平均硬度提升23%,涂层摩擦系数和磨损率都明显减小,耐磨性能显著提高。

英文摘要：

High entropy alloy（HEA） SiFeCoCrTi coating was prepared on Q235 steel by laser cladding. Effect of WC particles on the microstructure and properties of high entropy alloy SiFeCoCrTi coating was researched. The microstructure, phase, microhardness and wear resistance were investigated by OM, XRD, SEM, hardness testing and wear testing. The result shows that the microstructure of the HEA SiFeCoCrTi coating is dendrite consisting of bcc phase and intermetallics. After adding WC particle, the grain dendrite coating is formed, and large amounts of intermetallics appear in the coating, such as TiCo3 and Co1.07Fe18.93. The WC particle addition decreases dilution rate of the substrate, and increases the properties of the coating, e.g. the average hardness of the HEA FeSiCrCoMo coating increases by 23%, both of wear rate and friction coefficient decrease, and the wear-resistance improves obviously.