载气流量及搭接率对激光熔覆涂层形貌和应力场的影响

doi:10.13251/j.issn.0254-6051.2024.06.012

金属热处理 ›› 2024, Vol. 49 ›› Issue (6): 77-84.DOI: 10.13251/j.issn.0254-6051.2024.06.012

载气流量及搭接率对激光熔覆涂层形貌和应力场的影响

王嘉圣¹, 李云峰¹, 石岩^2,3, 唐术锋¹, 姜广君¹, 武建新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:2023-11-15 修回日期:2024-04-21 出版日期:2024-06-25 发布日期:2024-07-29
通讯作者: 李云峰,讲师,博士,E-mail:liyunfeng@imut.edu.cn
作者简介:王嘉圣(1997—),男,硕士,主要研究方向为激光加工技术,E-mail:15866692101@163.com。
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);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);内蒙古自治区直属高校基本科研业务费项目(JY2022016)

Effects of carrier gas flow and overlap rate on morphology and stress field of laser clad coatings

Wang Jiasheng¹, Li Yunfeng¹, Shi Yan^2,3, Tang Shufeng¹, Jiang Guangjun¹, Wu Jianxin¹

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:2023-11-15 Revised:2024-04-21 Online:2024-06-25 Published:2024-07-29

摘要/Abstract

摘要： 采用5 kW CO₂激光器在42CrMoA钢表面制备Ni45合金涂层,研究载气流量和接搭率对Ni45合金激光熔覆涂层的影响。采用有限元方法研究搭接率对涂层温度场和应力场的影响。采用气固两相流理论、FLUNT软件对送粉过程中的粉末流态进行有限元分析,研究载气流量对涂层形貌的影响。结果表明,随着搭接率的增大,熔覆层应力逐渐升高,导致涂层裂纹增多。通过300 ℃保温缓冷处理消除涂层裂纹。当搭接率＜40%时,涂层平整度较差。当搭接率≥40%时,涂层平整度较好且相差不大。当载气流量≤450 L/h 时,涂层表面较平整。当载气流量＞450 L/h后,涂层表面平整度开始下降。最佳熔覆工艺参数为载气流量450 L/h、搭接率40%。

关键词: 激光熔覆, 载气流量, 搭接率, 温度场, 应力场

Abstract: 5 kW CO₂ laser was used to prepare Ni45 coating on the surface of 42CrMoA steel. The effects of carrier gas flow and overlap rate on the quality of the Ni45 clad coating were studied. Finite element method was used to study the effect of overlap rate on the temperature and stress fields of the molten coating. The gas-solid two-phase flow theory and FLUNT software were used to analyze the powder flow pattern in the powder feeding process, and study the influence of carrier gas flow on the coating morphology. The results show that the stress and cracks gradually increase with the increase of the overlap rate in the clad layer, while the coating cracks can be eliminated through a 300 ℃ isothermal annealing treatment. When the overlap rate is < 40%, the flatness of the coating is poor, but when the overlap ratio is ≥ 40%, the coating flatness is good and shows no much different. When the carrier gas flow ≤ 450 L/h, the coating surface is flat, but when the carrier gas flow > 450 L/h, the flatness of the coating begins to decrease. By studying the effects of the overlap rate and carrier gas flow, the optimal cladding process parameters are obtained:the carrier gas flow is 450 L/h, and the overlap rate is 40%.

Key words: laser cladding, carrier gas flow, overlap rate, temperature field, stress field

中图分类号:

TG174.4

王嘉圣, 李云峰, 石岩, 唐术锋, 姜广君, 武建新. 载气流量及搭接率对激光熔覆涂层形貌和应力场的影响[J]. 金属热处理, 2024, 49(6): 77-84.

Wang Jiasheng, Li Yunfeng, Shi Yan, Tang Shufeng, Jiang Guangjun, Wu Jianxin. Effects of carrier gas flow and overlap rate on morphology and stress field of laser clad coatings[J]. Heat Treatment of Metals, 2024, 49(6): 77-84.

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载气流量及搭接率对激光熔覆涂层形貌和应力场的影响

Effects of carrier gas flow and overlap rate on morphology and stress field of laser clad coatings

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