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针对球墨铸铁与40Cr两种不同基体,采用不同的激光熔覆工艺,对其表面熔覆镍基纳米碳化钨,形成一种高耐磨的复合涂层。通过扫描电镜(SEM)分析了其显微组织,并利用X射线衍射仪(XRD)和能谱仪(EDS)对其组织成分、组织中存在的相进行了分析。结果表明,选择合适的激光处理参数,可在激光熔覆层内形成以WC为主的碳化物强化相,该强化相主要以网络状均匀分布于铁镍合金基体组织中,碳化物强化相尺寸相当一部分在纳米或微纳米量级,形成了一种组织细小并且显微组织软硬相间的熔覆层,明显提高了耐磨性。
For ductile iron and 40Cr two different substrates, using different laser cladding process, the surface of the cladding of nickel-based nano-tungsten carbide, forming a high wear-resistant composite coating. The microstructure was analyzed by scanning electron microscopy (SEM), and the composition and the phases existing in the microstructure were analyzed by X-ray diffraction (XRD) and energy dispersive spectrometer (EDS). The results show that the WC-based carbide strengthening phase can be formed in the laser cladding layer by selecting appropriate laser processing parameters. The strengthening phase mainly distributes uniformly in the matrix of the Fe-Ni alloy matrix. The size of carbide strengthening phase A considerable part of the nano or micro-nano scale, the formation of a small and microstructure of the cladding between the soft and hard phases, significantly improve the wear resistance.