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采用激光熔覆技术,在45#钢基体表面分别制备了NiFeBSi合金涂层和NiFeBSi+质量分数10%纳米SiC复合涂层。利用X射线衍射(XRD)仪、扫描电镜(SEM)、显微硬度、摩擦磨损试验机分别对两种涂层的组成相、微观形貌、显微硬度和摩擦磨损特性进行了分析。结果表明,NiFeBSi合金涂层主要是由分布于γ(Fe,Ni)枝晶间的层片状FeNi3+α-Fe共析组织所组成。当质量分数10%的纳米SiC加入NiFeBSi合金涂层时,在γ(Fe,Ni)枝晶间除分布有FeNi3+α-Fe共析组织外,因在激光熔覆过程中纳米SiC颗粒的分解,还形成了多种碳化物。由于多种碳化物的复合增强作用,以及对共析组织的细化作用,有效地提高了NiFeBSi合金涂层的硬度和耐磨性能。
NiFeBSi alloy coating and NiFeBSi + 10% nano-SiC composite coating on 45 # steel substrate were prepared by laser cladding. The composition, microstructure, microhardness and tribological properties of the two coatings were analyzed by X-ray diffraction (XRD), scanning electron microscopy (SEM), microhardness and friction and wear tester. The results show that the NiFeBSi alloy coating consists mainly of lamellar FeNi3 + α-Fe eutectics distributed between γ (Fe, Ni) dendrites. When 10% nano-SiC is added into the NiFeBSi alloy coating, the FeNi3 + α-Fe eutectoid structure is distributed between the γ (Fe, Ni) dendrites. Because of the decomposition of nano-SiC particles during laser cladding, , But also formed a variety of carbide. The hardness and wear resistance of NiFeBSi alloy coating are effectively improved due to the compound strengthening effect of various carbides and the refinement of the eutectoid structure.