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采用同轴送粉激光熔化沉积方法在0Cr18Ni10Ti不锈钢表面制备出420不锈钢的多层涂层及薄壁样,着重分析了沉积涂层的微观组织、硬度、界面结合情况及抗腐蚀性能。结果表明,激光熔化沉积的420不锈钢为单相α马氏体,沉积材料内部组织致密均匀,沉积材料的硬度在47-51HRC;沉积涂层与基体为完全冶金结合,沿沉积高度方向沉积材料的拉伸强度及界面的结合强度均大于基体材料的强度,界面结合强度达790MPa;与基体材料相比,所沉积420不锈钢的自腐蚀电位低、极化电阻小,抗腐蚀性稍差,该涂层可用于低腐蚀环境下0Cr18Ni10Ti不锈钢表面的强化及420不锈钢零件的修复。
The multi-layer and thin-walled samples of 420 stainless steel were prepared on the surface of 0Cr18Ni10Ti stainless steel by coaxial powder laser deposition method. The microstructure, hardness, interfacial bonding and corrosion resistance of the deposited coatings were analyzed emphatically. The results show that the laser-melted 420 stainless steel is single-phase α-martensite, the internal structure of the deposited material is dense and uniform, and the hardness of the deposited material is 47-51 HRC. The deposited coating and the substrate are completely metallurgical bonded, depositing the material along the deposition height Tensile strength and the bonding strength of the interface are greater than the strength of the matrix material, the interface bonding strength of 790MPa; compared with the substrate material, deposited 420 stainless steel corrosion potential is low, the polarization resistance is small, slightly less corrosion resistance The layer can be used to strengthen the surface of 0Cr18Ni10Ti stainless steel in low corrosive environment and the repair of 420 stainless steel parts.