【摘要】 研究了W18Cr4V高速钢表面TiC－Co金属陶瓷熔覆层的组织及其与基体间的界面组织特征，熔覆层的组织特征为在灰色共晶组织上分布着大量的TiC颗粒，与基体形成了良好的冶金结合。在熔覆过程中TiC部分熔化，而Co则全部熔化，且有一定的烧损。熔覆层硬度较高，可达1682HV0.1。Ni基合金过渡底层的采用．可以在较宽的工艺范围内得到均匀连续且为冶金结合的金属陶瓷激光溶覆层，涂层最高硬度为1193HV0.1。更多还原

【Abstract】 The structure of the laser cladding cotaings of TiC-Co metal ceramic on W18Cr4V high-speed steel and the interface between the coating and the matrix are studied.The structure characteristics of TiC-Co coatings is that there are a large number of spheric TiC particles homogeneously distributed in gray eutectic structure. The metallurgical combined interface can be obtained between the coatings and the matrix. The microhardness of TiC-Co coatings is up to about 1682HV0.1. Due to adoption of Ni-based alloy transitional bottom layer.the laser-clad metal ceramic coatings which are uniform, continous and metallurgical bonding with matrix can be obtained over the wider range of processing parameters, but the highest microhardness of the coatings is 1193 HV0.1.更多还原