| 摘要: |
| 针对镍基高温合金 Inconel 718 表面损伤问题,利用超音速微粒沉积-激光同步强化技术在基体表面制备了相同成分的 Inconel 718 修复涂层。 采用场发射扫描电子显微镜( SEM) 及其自带的能谱分析仪 EDS、X-射线衍射仪 (XRD)、显微拉曼光谱仪、场发射高分辨透射电子显微镜(TEM)分析了激光功率为 1300 W 时涂层的微观组织结构和 750 ℃高温氧化后表/ 截面形貌。 结果表明:涂层表面光洁,内部组织致密,孔隙率仅为 0. 2%,涂层与基体结合良好且无明显裂纹等缺陷。 在氧化初期,镍基高温合金涂层表面快速氧化并形成富 Ni、Fe、Cr 的 NiO、Fe2O3 、Cr2O3 以及含 Ni 的尖晶石 Cr2O3·NiO 结构。随着氧化时间的延长,NiO 与 Fe2O3 结合生成复合相 NiFe2O4 ,而覆盖在 NiO 表面的 Cr2O3 不断生长扩张,与 NiO 发生固相反应生成 NiCr2O4 。 |
| 关键词: 超音速微粒沉积 激光同步强化 镍基高温合金 微观结构 高温氧化 |
| DOI：10.11933/j.issn.1007-9289.20200302002 |
| 分类号:TG495 |
| 文章编号:1007-9289(2020)04-0152-08 |
| 文献标识码:A |
| 基金项目:中国科协青年人才托举 工 程 ( 2017QNRC001 )； 东 北 大 学 航 空 动 力 装 备 振 动 及 控 制 教 育 部 重 点 实 验 室 研 究 基 金 (VCAME201706) |
|
| High Temperature Oxidation Behavior of Inconel 718 Coating Prepared by Supersonic Particle Deposition-Laser Synchronous Enhancement |
|
Li Danyang1,2, Han Guofeng2, Yin Fengshi1, Ren Zhiqiang2, Zhu Sheng2, Wang Xiaoming2
|
|
1.School of Mechanical Engineering, Shandong University of Technology, Zibo 255000 , China;2.Science and Technology on Remanufacturing Laboratory, Academy of Armored Forces Engineering, Beijing 100072 , China
|
| Abstract: |
| For the surface damage of Inconel 718 nickel-based superalloy, same composition Inconel 718 repair coating was prepared on the surface of substrate by supersonic particle deposition-laser synchronous enhancement technology. The microstruc- ture of the coating prepared by 1300 W laser power and high temperature oxidation surface / section topography at 750 ℃ were in- vestigated by field emission scanning electron microscopy (SEM) and its own energy disperse spectroscopy(EDS), X-ray dif- fraction (XRD), micro Raman spectrometer, and field emission high resolution transmission electron microscopy(TEM). Re- sults show that the coating has smooth surface and dense internal structure, the porosity is only 0. 2% and good bonding state without obvious cracks and other defects is obtained. The surface of the nickel-based superalloy coating is rapidly oxidized to form NiO, Fe2O3 , Cr2O3 and Ni-containing spinel Cr2O3·NiO rich in Ni, Fe, Cr at early stage of oxidation. As the oxidation time increases, NiO and Fe2O3 generate composite phase NiFe2O4 , Cr2O3 covering on the surface of NiO grows and expands con- tinuously, and solid-phase reaction with NiO generates NiCr2O4 . |
| Key words: supersonic particle deposition laser synchronous enhancement nickel-based superalloy microstructure high temperature oxidation |
