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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TiCo_3、Co_(1.07)Fe_(18.93)。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。
High-entropy alloy SiFeCoCrTi coatings were prepared on Q235 steel substrate by laser cladding and the effect of WC particles on microstructure and properties of high-entropy alloy coatings was studied. The microstructure, phase structure, hardness and wear properties of high-entropy alloy coating were investigated by OM, XRD, SEM, hardness test and wear test. The results show that the high entropy alloy SiFeCoCrTi coating is a cellular dendritic structure mainly composed of bcc phase and intermetallic compounds. After the addition of WC, densified and dendritic crystals were formed in the coating, and a large amount of intermetallic compounds were formed, such as TiCo_3 and Co_ (1.07) Fe_ (18.93). At the same time, the addition of WC reduced the dilution rate of the substrate, the performance of the coating was significantly improved, the average hardness of the coating increased by 23%, the friction coefficient and wear rate of the coating decreased significantly, and the wear resistance was significantly improved.