其阻氢性能的影响①
(1.北京航空航天大学理学院材料物理与化学研究中心,北京100083; 2.西北工业大学凝固技术国家重点实验室,西安710072)
摘 要: 采用X射线衍射仪、扫描电镜及热充氢等方法,研究了激光重熔对不锈钢表面热喷涂铝涂层的微观结构及其阻氢性能的影响。结果表明：激光重熔后涂层组织均匀、致密,主要由AlFe(Ni,Cr)固溶体、CrFeNi奥氏体等相组成,而且涂层与基体形成了良好的冶金结合。此外,激光表面重熔后涂层的阻氢性能亦得到改善。
关键字: 激光表面重熔;微观结构;阻氢性能
（1. Center of Materials Physics and Chemistry, College of Science,Beijing University of Aeronautics and Astronautics, Beijing100083, P.R.China;2. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi′an 710072, P.R.China）
Abstract:The effects of laser surface remelting on the microstructure and hydrogen permeation resistance of thermal spraying aluminum coatings on the surface of austenitic stainless steel was studied by using XRD, SEM and thermal hydrogen-charging. The results indicate that the microstructure of laser remelted coating is both homogeneous and dense, the main phases of laser remelted coating are AlFe(Ni, Cr), CrFeNi and so on. Also metallurgical bond between coating and base metal has been formed. Moreover, the hydrogen permeation resistance of aluminum coatings was improved to a certain extent after laser remelting.
Key words: laser surface remelting; microstructure; hydrogen permeation resistance
