激光高速沉积Inconel 625涂层组织特征及性能  

Microstructure Characteristics and Properties of Inconel 625 Coating Prepared by High-Speed Laser Deposition

作　　者：杨胶溪[1] 杨剑锋[1] 白兵 刘琦 李怀学 YANG Jiaoxi;YANG Jianfeng;BAI Bing;LIU Qi;LI Huaixue(Beijing University of Technology,Beijing 100124,China;Science and Technology on Power Beam Processes Laboratory,AVIC Manufacturing Technology Institute,Beijing 100024,China;Beijing Key Laboratory of High Power Beam Additive Manufacturing Technology and Equipment,AVIC Manufacturing Technology Institute,Beijing 100024,China;Aeronautical Key Laboratory for Additive Manufacturing Technologies,AVIC Manufacturing Technology Institute,Beijing 100024,China)

机构地区：[1]北京工业大学,北京100124 [2]中国航空制造技术研究院高能束流加工技术重点实验室,北京100024 [3]中国航空制造技术研究院高能束流增量制造技术与装备北京市重点实验室,北京100024 [4]中国航空制造技术研究院增材制造航空科技重点实验室,北京100024

出　　处：《航空制造技术》2024年第21期47-52,61,共7页Aeronautical Manufacturing Technology

基　　金：国防基础科研计划(JCKY2022205B020)。

摘　　要：激光高速沉积工艺可以改善常规熔覆涂层存在的腐蚀问题,为了研究扫描速度对熔覆涂层微观组织和性能的影响,采用不同的激光扫描速度在300M钢基体上制备Inconel 625镍基合金涂层,重点分析了40m/min和70m/min两种典型扫描速度条件下制备熔覆层的显微组织、物相组成、硬度、抗腐蚀性能等。结果表明,不同扫描速度条件下制备的镍基合金涂层的冶金形态主要是胞状晶和柱状晶,其相成分主要由γ-Ni固溶体和Fe3Ni2两种物相构成。高速激光熔覆层的硬度随着线扫描速度的增加呈增加趋势,且涂层的腐蚀电位逐渐增大、腐蚀电流密度逐渐减小。随着扫描速率的提高,涂层的均匀性提高,稀释率、晶粒度及热输入显著降低,界面元素的扩散得到抑制,因此材料的腐蚀性能显著提高。The high-speed laser deposition process can improve the corrosion problem of conventional cladding coatings.In order to study the effect of scanning speed on the microstructure and properties of cladding coatings,Inconel 625 coatings were prepared on 300M steel substrate with different laser scanning speed.The microstructure,phase composition,hardness and corrosion resistance of the coatings prepared at 40 m/min and 70 m/min were analyzed.The results show that the metallurgical morphology of Ni-based alloy coating prepared at different scanning speed is mainly cellular and columnar,and the phase composition is mainly composed ofγ-Ni solid solution and Fe3Ni2.The hardness of high-speed laser cladding layer increases with the increase of line scanning speed,the corrosion potential increases and the corrosion current density decreases gradually.With the increase of scanning rate,the uniformity of the coating is improved,and the dilution ratio,grain size and heat input are significantly reduced,and the diffusion of interface elements is inhibited,so the corrosion performance of the material is significantly improved.

关 键 词：激光高速沉积 镍基合金涂层 微观组织 冶金行为 溶质截留 抗腐蚀性能 

分 类 号：TG174.4[金属学及工艺—金属表面处理] TG665[金属学及工艺—金属学]