铸钢轧辊表面电火花沉积WC-15Co涂层特性研究

Characterization of Electro-spark Deposition WC-15Co Coating on Cast Steel Roll

采用新型电火花沉积设备,把WC-15Co电极材料沉积在铸钢轧辊材料上,制备WC-15Co沉积涂层,研究其微观组织及耐磨性能。结果表明:沉积层主要由Fe3W3C,Co3W3C,Fe和Fe2C等相组成;沉积层与基体冶金结合,沉积层中Fe3W3C,Co3W3C和Fe2C等硬质相弥散分布在基体Fe上,部分区域硬质相达到了纳米颗粒尺寸;沉积层硬度分布不均匀,平均硬度为660HV;沉积层具有优异的耐磨性,其磨损性能提高了2.7倍;沉积层的磨损主要是黏着磨损、疲劳磨损、氧化磨损和磨粒磨损的综合作用,细小的弥散分布的硬质相是沉积层硬度以及耐磨性提高的主要因素。

Using a new type electro-spark deposition,WC-15Co electrode was deposited on the surface of cast steel roll by electro-sparking deposition（ESD）.The microstructure and wear resistance of the coating were investigated.The results show that the coating consists of Fe3W3C,Co3W3C,Fe2C and Fe phases.The coating is well metallurgical bonded with cast steel roll substrate.The Fe3W3C,Co3W3C and Fe2C phases distribute in the coating dispersedly,with the extra-fine structure for the phases in some area.The average hardness of the coating is 660HV.The coating has good wear and the average wear resistance rate is 2.7 of that of the cast steel substrate.The wear mechanism is adhesion wear,fatigue wear,oxidization wear and abrasive wear.Fine hard phases distributed in the coating dispersedly are the main factors leading the high hardness and wear resistance of the coating.