碳化钨对激光熔覆高熵合金的影响

为了获得高性能的涂层材料,采用激光熔覆的方法,在Q235钢基体上制备了FeSiCrCoMo高熵合金涂层, 并研究了WC对高熵合金涂层的组织和性能的影响。通过金相、X射线衍射、扫描电镜、硬度计、磨损试验机分别研究了添加WC前后涂层的微观形貌、相结构、硬度及磨损性能。结果表明：高熵合金FeSiCrCoMo涂层组织为粗大枝状晶,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胞状晶,同时BCC相增多,金属间化合物明显减少；添加WC后涂层的硬度明显增强,平均硬度提升了23%,涂层表面平均硬度达到了687 HV0.2；WC的添加使得涂层的摩擦系数减小,磨损率减小,耐磨性能提高。

Effect of wolfram carbide particles on high entropy alloy coating prepared by laser cladding

To obtain the coating with excellent properties, FeSiCrCoMo high entropy alloy (HEA) coatings on Q235 steel were prepared by laser cladding. The effect of adding WC on microstructure and properties of the HEA coatings were investigated. By means of OM, XRD, SEM, microhardness test and hardmeter abrasion tester, the microstructure, phase structure, hardness and wear resistance of the coatings adding WC and without adding WC were studied. The experimental results indicate that the microstructure of the FeSiCrCoMo HEAs coating is dendrite, the coating is mainly composed of body centered cubic (BCC) with intermetallics. The microstructure of the coating with WC is grain cellular crystal, at the same time, the BCC phase increase and intermetallics decrease. The mechanical properties of the coating are also enhanced by adding WC. With WC added, the average hardness of the coating increases by 23%, the average hardness of coating reaches 687HV0.2; on the other hand, the wear rate decreases and wear resistance increases, hence the wear-resisting performance improves.