钨极氩弧重熔对电弧喷涂复合涂层组织的影响

采用改进的电弧喷涂工艺在钢基底上制备WC颗粒增强钢基复合涂层,并对其进行钨极氩弧重熔以获得与基材呈冶金结合的耐磨复合涂层。利用光学显微镜、SEM、XRD、显微硬度计对涂层成分、组织、相结构及显微硬度进行测试。结果表明:电弧喷涂WC-钢基复合涂层经钨极氩弧重熔后,涂层的致密度提高,组织细小均匀,熔覆层与基材形成良好的冶金结合,熔覆层由F、P和其上分布的均匀、细小WC颗粒组成,无二次析出相,涂层的组织较之重熔前显著改善。

Influence of tungsten inert gas arc remelting process on the structure of the composite coating prepared by arc spraying

WC-steel composite wear-resistant coating was prepared by means of the improved arc spraying process.Argonshielded arc remelting technology was used to remelt the coating and get wear-resistant coating which bonds to the base metallurgically.The component,microstructure and properties of the composite coating were analysed by means of metallographic microscope,scanning electron microscopy(SEM),energy dispersive spectroscopy(EDS),X-ray diffraction(XRD) and microhardness tester.The results show that the composite coatings have more homogeneous and finer microstructures after remelting.The remelting process can increase the density of coating.The composite coating,which consists of F,P and fine uniform distributed WC particles,is metallurgically bonded to the base metal after argon-shielded arc remelting.There isn′t any secondary phase precipitated from the matrix during the remelting process.The microstructure of coating has been improved.