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用常规激光重熔和添加纳米SiC颗粒后的激光重熔分别对等离子喷涂铁基WC涂层进行表面处理,采用扫描电子显微镜观察试样表面及截面的微观形貌,采用电镜附带的能谱仪对涂层与基体界面处的元素分布进行检测,采用X射线衍射仪对涂层的相成分进行分析,并对涂层表面的残余应力进行计算,最后利用显微硬度计测量了涂层不同深度处的显微硬度。结果表明:在激光重熔和纳米SiC的耦合作用下,涂层内的孔隙、裂纹等微观缺陷得以改善,CrSi2、Cr7C3等硬质合金相增加,并生成新相Fe2Si、CrSi;涂层表面的残余应力由363.4 MPa降低到158.6 MPa,显微硬度由631HV提高到了1195HV。
The surface of the plasma-sprayed WC-WC coating was treated by conventional laser remelting and laser remelting after the addition of nano-sized SiC particles. The surface morphology and cross-section of the sample were observed by scanning electron microscopy. The elemental distribution at the interface between the coating and the matrix was tested. The phase composition of the coating was analyzed by X-ray diffractometer. The residual stress of the coating surface was calculated. Finally, the micro-hardness of the coating was measured. Department of micro-hardness. The results show that the micro-defects such as pores and cracks in the coating are improved under the coupling of laser remelting and nano-SiC, and the hard phases such as CrSi2 and Cr7C3 increase and new phases Fe2Si and CrSi are formed. The residual stress decreased from 363.4 MPa to 158.6 MPa, and the microhardness increased from 631 to 1195 HV.