这项研究考察了不同添加水平的钨(W)含量对微观结构的影响,耐腐蚀性,耐磨性,显微硬度,以及使用激光熔覆技术由FeCoCrNiAl高熵合金(HEA)制成的涂层的相组成。使用预设的粉末方法,FeCoCrNiAlWx(其中x表示W的摩尔分数,x=0.0、0.2、0.4、0.6、0.8)将HEA涂层包覆在45钢的表面上。采用往复式摩擦磨损试验机对不同覆层材料进行干摩擦试验。随后,微观结构的详细分析,相组成,耐腐蚀性,磨损痕迹,使用扫描电子显微镜(SEM)进行硬度特性,X射线衍射仪(XRD),电化学工作站,和显微硬度计。结果表明,随着W含量的增加,FeCoCrNiAlWxHEA包层涂层的宏观形貌劣化;FeCoCrNiAlWxHEA包层涂层的微观结构,由μ相和面心立方固溶体组成,经历了从树枝状晶体到细胞晶体的进化过程。值得注意的是,随着W含量的增加,熔覆层的平均显微硬度呈现显著上升趋势,FeCoCrNiAlW0.8的平均硬度达到756.83HV0.2,是45钢基体的2.97倍。同时,包覆层的摩擦系数逐渐减小,表明增强的耐磨性。具体来说,FeCoCrNiAlW0.6和FeCoCrNiAlW0.8的摩擦系数相似,大约0.527摩擦磨损机理主要为粘着磨损和磨料磨损。在3.5wt。%NaCl溶液,W含量的增加导致包层涂层的腐蚀电位发生正变化。FeCoCrNiAlW0.8的腐蚀电位比FeCoCrNiAl的腐蚀电位高约403mV。腐蚀电流密度从5.43×10-6A/cm2显着降低到5.26×10-9A/cm2,这表明包层涂层的耐腐蚀性显着提高。
This study examines the effects of different addition levels of tungsten (W) content on the microstructure, corrosion resistance, wear resistance, microhardness, and phase composition of coatings made from FeCoCrNiAl high-entropy alloy (HEA) using the laser cladding technique. Using a preset powder method, FeCoCrNiAlWx (where x represents the molar fraction of W, x = 0.0, 0.2, 0.4, 0.6, 0.8) HEA coatings were cladded onto the surface of 45 steel. The different cladding materials were tested for dry friction by using a reciprocating friction and wear testing machine. Subsequently, the detailed analysis of the microstructure, phase composition, corrosion resistance, wear traces, and hardness characteristics were carried out using a scanning electron microscope (SEM), X-ray diffractometer (XRD), electrochemical workstation, and microhardness tester. The results reveal that as the W content increases, the macro-morphology of the FeCoCrNiAlWx HEA cladding coating deteriorates; the microstructure of the FeCoCrNiAlWx HEA cladding coating, composed of μ phase and face-centered cubic solid solution, undergoes an evolution process from dendritic crystals to cellular crystals. Notably, with the increase in W content, the average microhardness of the cladding coating shows a significant upward trend, with FeCoCrNiAlW0.8 reaching an average hardness of 756.83 HV0.2, which is 2.97 times higher than the 45 steel substrate. At the same time, the friction coefficient of the cladding coating gradually decreases, indicating enhanced wear resistance. Specifically, the friction coefficients of FeCoCrNiAlW0.6 and FeCoCrNiAlW0.8 are similar, approximately 0.527. The friction and wear mechanisms are mainly adhesive and abrasive wear. In a 3.5 wt.% NaCl solution, the increase in W content results in a positive shift in the corrosion potential of the cladding coating. The FeCoCrNiAlW0.8 exhibits a corrosion potential approximately 403 mV higher than that of FeCoCrNiAl. The corrosion current density significantly decreases from 5.43 × 10-6 A/cm2 to 5.26 × 10-9 A/cm2, which suggests a significant enhancement in the corrosion resistance of the cladding coating.