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材料导报  2025, Vol. 39 Issue (3): 23110265-6    https://doi.org/10.11896/cldb.23110265
  金属与金属基复合材料 |
激光沉积修复GH738/K417G合金时效热处理组织性能分析
卞宏友1,2, 柳金生1,2, 刘伟军1,2,*, 张广泰1,2, 姚佳彬1,2, 邢飞1,2
1 沈阳工业大学机械工程学院,沈阳 110870
2 辽宁省激光表面工程技术重点实验室,沈阳 110870
Analysis of Microstructure and Properties of GH738/K417G Alloy by Laser Deposition Repair by Aging Heat Treatment
BIAN Hongyou1,2, LIU Jinsheng1,2, LIU Weijun1,2,*, ZHANG Guangtai1,2, YAO Jiabin1,2, XING Fei1,2
1 School of Mechanical Engineering, Shenyang University of Technology, Shenyang 110870, China
2 Liaoning Provincial Key Laboratory of Laser Surface Engineering Technology, Shenyang 110870, China
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摘要 采用GH738粉末对K417G合金基体进行激光沉积修复试验,研究了时效热处理温度对激光沉积修复GH738/K417G合金组织性能的影响。研究表明:沉积态与热处理态修复区组织均以外延生长的柱状枝晶为主,枝晶尺寸随时效温度的升高而增大,热处理态修复区顶部形成了明显的等轴晶晶界。热处理后修复区中γ′相尺寸与M23C6型碳化物的连续程度均随时效温度的升高而增大。当一级时效温度达到880 ℃时,γ′相平均尺寸显著增大,晶界处细小的M23C6型块状碳化物连续析出,并有向包膜状转变的趋势。与沉积态相比,热处理态修复区显微硬度显著提高,且高于基体硬度;摩擦系数远低于沉积态修复区的摩擦系数,磨损机理主要为轻微的磨粒磨损和氧化磨损。
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卞宏友
柳金生
刘伟军
张广泰
姚佳彬
邢飞
关键词:  激光技术  GH738合金  K417G合金  激光沉积修复  显微组织  摩擦磨损性能  时效热处理    
Abstract: GH738 powder was used to carry out laser deposition repair tests on K417G alloy substrate, and the effect of aging heat treatment temperature on the microstructure and properties of laser deposition repair of GH738/K417G alloy was investigated. The results showed that the microstructure of the areas in both deposition state and heat treatment state repair zone was dominated by epitaxial columnar dendrites, and the size of dendrites increased with the increase of aging temperature, and an obvious equiaxial crystal boundary was formed at the top of the repair zone in the heat treatment state. The size of γ′ phase and the continuity of M23C6-type carbides in the repaired zone after heat treatment both increase with the aging temperature. Under a primary aging temperature of 880 ℃, the average size of the γ′ phase increases significantly, and fine M23C6-type massive carbides at the grain boundaries precipitate continuously, and has a tendency to transform into a encapsulation-like shape. Compared with the deposition state, the microhardness of the repaired area in the the heat treatment state is significantly increased, and which is higher than the hardness of the substrate also. The friction coefficient is much lower than that of the repaired areas in the depositional state, and the wear mechanisms is dominated by minor abrasive wear and oxidative wear.
Key words:  laser technology    GH738 alloy    K417G alloy    laser deposition repair    microstructure    friction and wear properties    aging heat treatment
出版日期:  2025-02-10      发布日期:  2025-02-05
ZTFLH:  TN249  
基金资助: 国家科技重大专项(2019-Ⅶ-0004-0144) ;辽宁“百千万人才工程”资助项目 (LNBQW2020B0050)
通讯作者:  *刘伟军,博士,现为沈阳工业大学机械工程学院教授、博士研究生导师。主要研究方向为复杂曲面精密测量与数字化加工理论与技术及装备、激光制造理论与技术及装备、机器人相关理论与技术及装备。wjliu@huiyuanrobot.com   
作者简介:  卞宏友,博士,沈阳工业大学机械工程学院教授、博士研究生导师。主要研究方向为增材制造、激光增材再制造、激光清洗、激光冲击强化技术。
引用本文:    
卞宏友, 柳金生, 刘伟军, 张广泰, 姚佳彬, 邢飞. 激光沉积修复GH738/K417G合金时效热处理组织性能分析[J]. 材料导报, 2025, 39(3): 23110265-6.
BIAN Hongyou, LIU Jinsheng, LIU Weijun, ZHANG Guangtai, YAO Jiabin, XING Fei. Analysis of Microstructure and Properties of GH738/K417G Alloy by Laser Deposition Repair by Aging Heat Treatment. Materials Reports, 2025, 39(3): 23110265-6.
链接本文:  
http://www.mater-rep.com/CN/10.11896/cldb.23110265  或          http://www.mater-rep.com/CN/Y2025/V39/I3/23110265
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