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采用电火花沉积工艺,在铸钢表面制备了WC-4Co沉积涂层,采用X射线衍射仪、扫描电镜、显微硬度计等对沉积层的相结构、显微组织、显微硬度及耐磨性能进行了分析。结果表明:沉积层主要由Co3W3C、Fe3W3C、W2C、Fe7W6等相组成;沉积层与基体呈冶金结合,Fe7W6、W2C等硬质相弥散分布于沉积层中,部分区域硬质相达到了纳米颗粒尺寸;沉积层的平均硬度为1517HV0.3,约是基体硬度(502 HV0.3)的3倍;其耐磨性能比基体提高了2.4倍;沉积层的主要磨损机制为疲劳磨损,细小的弥散分布的硬质相是沉积层硬度以及耐磨性能提高的主要因素。
The WC-4Co coating was prepared on the cast steel by EDM. The phase structure, microstructure, microhardness and wear resistance of the deposited layer were characterized by X-ray diffraction, scanning electron microscope and microhardness tester Performance was analyzed. The results show that the sedimentary layer is composed mainly of Co3W3C, Fe3W3C, W2C and Fe7W6 phases. The sedimentary layer is metallurgically bonded with the matrix, while the hard phases such as Fe7W6 and W2C are dispersedly distributed in the sedimentary layer. Part of the hard phase reaches the nano-particle size ; The average hardness of the deposited layer is 1517HV0.3, which is about three times of that of the substrate (502 HV0.3); its wear resistance is improved by 2.4 times than that of the matrix; the main wear mechanism of the deposited layer is fatigue wear and fine dispersion The hard phase is the main factor in the hardness and wear resistance of the deposited layer.