金属热处理 ›› 2024, Vol. 49 ›› Issue (2): 281-290.DOI: 10.13251/j.issn.0254-6051.2024.02.044

• 表面工程 • 上一篇    下一篇

载气流量对激光熔覆添加Y2O3的镍基涂层组织和耐腐蚀性的影响

李云峰1, 王嘉圣1, 石岩2,3, 姜广君1, 唐术锋1, 何晓东1   

  1. 1.内蒙古工业大学 机械工程学院, 内蒙古 呼和浩特 010051;
    2.长春理工大学 机电工程学院, 吉林 长春 130022;
    3.国家国际光学科技合作基地, 吉林 长春 130022
  • 收稿日期:2023-09-03 修回日期:2023-12-25 出版日期:2024-03-27 发布日期:2024-03-27
  • 作者简介:李云峰(1989—),男,讲师,博士,主要研究方向为激光加工技术,E-mail:liyunfeng@imut.edu.cn
  • 基金资助:
    内蒙古自治区自然科学基金青年基金(2023QN05013);内蒙古自治区直属高校基本科研业务费项目(JY20220262,JY2022016);内蒙古工业大学科研启动金项目(DC2200000878);内蒙古自治区高等学校创新团队发展计划(NMGIRT2213)

Influence of carrier gas flow rate on microstructure and corrosion resistance of laser clad Ni-based coatings with Y2O3

Li Yunfeng1, Wang Jiasheng1, Shi Yan2,3, Jiang Guangjun1, Tang Shufeng1, He Xiaodong1   

  1. 1. College of Mechanical Engineering, Inner Mongolia University of Technology, Hohhot Inner Mongolia 010051, China;
    2. School of Mechanical and Electric Engineering, Changchun University of Science and Technology, Changchun Jilin 130022, China;
    3. National Base of International Science and Technology Cooperation for Optics, Changchun Jilin 130022, China
  • Received:2023-09-03 Revised:2023-12-25 Online:2024-03-27 Published:2024-03-27

摘要: 采用5 kW二氧化碳激光,在42CrMoA钢基体上制备纯Ni45合金涂层和Ni45+0.4wt%Y2O3涂层。用FLUENT软件对载气流量进行了数值模拟。采用光学显微镜、扫描电镜和XRD测试仪对两种涂层的宏观形态和微观结构进行了表征。结果表明,当载气流量从500 L/h提高到700 L/h时,粉末收敛点的浓度先增大后降低;两种涂层凝固类型由平面晶、胞状晶、柱状枝晶和等轴晶组成;两种涂层由γ-Ni、M23C6和Ni3B组成;采用600 L/h载气流量涂层的微观结构细化程度最好。耐腐蚀性随载气流量的增加而增加,随后又降低,采用600 L/h载气流量的涂层耐腐蚀性最好。

关键词: 镍基激光熔覆涂层, Y2O3, 数值模拟, 微观结构, 耐腐蚀性

Abstract: A 5 kW CO2 laser was used for the preparation of pure Ni45 alloy coating and Ni45+0.4wt%Y2O3 coating on 42CrMoA steel substrate. Numerical simulation of the carrier gas flow rate was conducted using FLUENT software. The macroscopic morphologies and microstructure of the two coatings with different carrier gas flow rates were characterized using optical microscopy, scanning electron microscopy and XRD tester. The results show that as the carrier gas flow rate is increased from 500 L/h to 700 L/h, the powder deposition efficiency initially increases and then decreases. The solidification types of the two coatings consist of planar grains, cellular grains, columnar dendritic grains, and equiaxed grains, and with γ-Ni, M23C6, and Ni3B phases. The microstructure refinement is most prominent when using a carrier gas flow rate of 600 L/h. The corrosion resistance increases initially, then decreases with the increase of carrier gas flow rate, and the coating produced with 600 L/h carrier gas flow rate has the best corrosion resistance.

Key words: Ni-based laser clad coating, Y2O3, numerical simulation, microstructure, corrosion resistance

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