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以WC合金为电极,采用电火花沉积技术在35CrMo钢表面沉积WC合金强化涂层,考察了涂层的断面显微硬度,并通过金相显微镜、扫描电镜(SEM)、能谱(EDX)、X-射线衍射(XRD)等表征了强化涂层的微观结构。结果表明:涂层的表面显微硬度约为基体的2.5倍,涂层的耐磨性显著提高;涂层与基体的主要元素发生了相互扩散,所获涂层是由基体与WC合金电极发生反应的冶金结合层,涂层的主要成分是Fe7C3、Fe3W3C、Fe7C3、Fe7W6、Fe3W3C和Fe7W6。
WC alloy was deposited on the surface of 35CrMo steel by EDM. The microhardness of the coating was investigated. The microstructure of the coating was characterized by means of metallographic microscope, scanning electron microscope (SEM), energy dispersive X-ray diffraction (EDX) X-ray diffraction (XRD), etc. characterize the microstructure of the strengthened coating. The results show that the microhardness of the coating is about 2.5 times that of the matrix and the wear resistance of the coating is significantly increased. The main elements of the coating and the matrix interdiffuse with each other, and the obtained coating is formed by the substrate and the WC alloy electrode Reactive metallurgical bonding layer, the coating is the main component of Fe7C3, Fe3W3C, Fe7C3, Fe7W6, Fe3W3C and Fe7W6.