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通过水冷提高凝固速率及降低基体金属对熔覆层的稀释,采用改进的钨极惰性气体氩弧熔覆的方法,原位制备了大厚度(1—5mm)Fe基非晶/纳米晶复合涂层.利用X射线衍射,光学显微镜和透射电子显微镜对涂层成分和组织进行分析,并测试了涂层的显微硬度.结果表明,采用快冷熔覆的方法可以制备出含有50%以上非晶含量的非晶/纳米晶复合涂层,涂层内纳米晶颗粒表面被非晶过渡层包覆.较厚涂层的显微硬度达到1600HV0.3,与基体为冶金连接,有良好的结合强度及耐磨性.非晶/纳米晶复合结构使得涂层与基体之间的过渡区具备较强的弹塑性,提高了涂层的抗冲击性.最后重点讨论了微观结构和性能之间的内在联系,涂层内非晶相与纳米晶相的协同作用是造成涂层高硬度的主要原因.
By solidification with water cooling to improve the solidification rate and reduce the base metal dilution of the cladding layer, an improved tungsten inert gas argon arc cladding method in situ prepared a large thickness (1-5mm) Fe-based amorphous / nanocrystalline composite coating The composition and microstructure of the coating were analyzed by X-ray diffraction, optical microscope and transmission electron microscope.The microhardness of the coating was tested.The results show that the composition of the coating can be prepared by the method of rapid cooling and cladding, Crystal content of amorphous / nanocrystalline composite coating, the coating surface of the nanocrystalline particles are coated with amorphous transition layer thicker coating microhardness 1600HV0.3, metallurgical connection with the substrate, a good combination Strength and wear resistance.An amorphous / nanocrystalline composite structure makes the transition zone between the coating and the matrix with a strong elastoplastic, improve the impact resistance of the coating.Finally, focusing on the microstructure and properties between Intrinsic relationship, the coating within the amorphous phase and nanocrystalline phase synergy is the main reason for the coating hardness.