CAJ | 학술논문

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.
침대구묵주철여40Cr량충불동기체,채용불동적격광용복공예,대기표면용복얼기납미탄화오,형성일충고내마적복합도층.통과소묘전경(SEM)분석료기현미조직,병이용X사선연사의(XRD)화능보의(EDS)대기조직성분、조직중존재적상진행료분석.결과표명,선택합괄적격광처리삼수,가재격광용복층내형성이WC위주적탄화물강화상,해강화상주요이망락상균균분포우철얼합금기체조직중,탄화물강화상척촌상당일부분재납미혹미납미량급,형성료일충조직세소병차현미조직연경상간적용복층,명현제고료내마성.
The composite layers with good wear resistance were formed by different parameters of laser cladding on the substrates of nodular cast iron and 40Cr. The microstructure of the layers were characterized by scanning electron microscopy (SEM), the compositions and phases were determined by X-ray diffraction (XRD) and energy dispersive spectrometer (EDS). The strengthening phase which was constituted mostly by WC particle, were uniformly distributed around matrix and Nickel-based materials in the layers with mesh pattern. The particles are nanometer or sub-nanometer size and improved the wear resistance of the cladding layers for they contribute to the microstructure alternated with hard and soft phase.