FeCrCoWCBY_2O_3合金激光熔覆层的性能研究

Properties of Laser Cladding FeCrCoWCBY_2O_3 Layer

通过对FeCrCoWCBY_2O_3合金粉末在低碳钢表面进行激光熔覆,获得了C、B含量较高的无裂纹熔覆层,其厚度在1.0～1.5mm之间。利用XRD、SEM等分析了熔覆层的成分及显微组织结构,并测试了涂层的硬度和耐磨性。结果显示:激光处理后表面迅速熔化和冷却,组织由马氏体、残余奥氏体枝晶和枝晶间碳化物组成;熔覆层的硬度比熔覆基体提高3倍多,且硬度最高值不在表层,而在距离表面0.3mm处;耐磨性相对基体提高接近2倍。

The laser cladding layer without cracks that contains high carbon and boron with thickness in the range of 1.0-1.5 mm was obtained by laser cladding of FeCrCoWCBY2O3 powders on the low carbon steel. The composition and microstructure of the laser cladding layer was analyzed by XRD and SEM. The microhardness and wear resistance were tested as well. The results show that when disposed by laser, the powders were melted and cooled rapidly. The microstructure of laser cladding consists of martensite and residual austenite dendritic and interdendritic carbides. The microhardness of the laser cladding increases over 3 times higher than that of the substrate. The maximum of the micro-hardness is not at the surface, but is located in 0.3 mm from the surface. The wear resistance of the cladding is approximately 2 times higher than that of the substrate.