华南理工大学学报(自然科学版) ›› 2025, Vol. 53 ›› Issue (1): 108-117.doi: 10.12141/j.issn.1000-565X.240094

• 材料科学与技术 • 上一篇    下一篇

TC4表面镍基涂层的微观组织及高温抗变形性能

付宇明, 李长城, 闫茂荣, 郑立娟   

  1. 燕山大学 机械工程学院,河北 秦皇岛 066004
  • 收稿日期:2024-03-04 出版日期:2025-01-25 发布日期:2025-01-02
  • 通信作者: 郑立娟(1971—),女,博士,教授,主要从事电磁热强化及激光熔覆强化与再制造研究。 E-mail:ydzlj@ysu.edu.cn
  • 作者简介:付宇明(1971—),男,博士,教授,主要从事激光熔覆强化与再制造、电磁热止裂技术等研究。E-mail: mec9@ysu.edu.cn
  • 基金资助:
    河北省自然科学基金项目(E2021203218)

Microstructure and High Temperature Deformation Resistance of Nickel-Based Coating on TC4 Surface

FU Yuming, LI Changcheng, YAN Maorong, ZHENG Lijuan   

  1. School of Mechanical Engineering,Yanshan University,Qinhuangdao 066004,Hebei,China
  • Received:2024-03-04 Online:2025-01-25 Published:2025-01-02
  • Contact: 郑立娟(1971—),女,博士,教授,主要从事电磁热强化及激光熔覆强化与再制造研究。 E-mail:ydzlj@ysu.edu.cn
  • About author:付宇明(1971—),男,博士,教授,主要从事激光熔覆强化与再制造、电磁热止裂技术等研究。E-mail: mec9@ysu.edu.cn
  • Supported by:
    the Natural Science Foundation of Hebei Province(E2021203218)

摘要:

为研究TC4表面激光熔覆涂层的耐高温抗变形性能,采用激光熔覆技术,以GH4169镍基高温合金粉末为基粉,HfC、ZrC、TaC、NbC过渡族碳化物为增强相,在TC4基材上制备不同比例的镍基金属-多元陶瓷复合涂层,通过组织表征和性能测试系统研究了不同多元陶瓷粉末含量涂层的微观组织、涂层硬度和高温抗变形能力。研究结果表明:碳化物陶瓷增强相的添加使涂层微观组织细化,硬度得到提升,当陶瓷增强相添加量为15%时涂层硬度最高,是基材的2.54倍;随温度升高,纯镍基熔覆涂层内部枝晶组织发生了溶解和分离,并逐渐等轴化;添加15%陶瓷粉末的镍基熔覆涂层中出现了枝晶破碎情况,熔覆层中弥散分布的陶瓷增强相发生了聚集长大现象;在3种高温压缩试验温度(700、800、900 ℃)下,试件的最大等效应力和最大等效应变均出现在基材内部,相比于TC4试件,激光熔覆试件在涂层结合区产生应力突变,涂层的抗变形能力有所增强。

关键词: TC4钛合金, 激光熔覆, 微观组织, 显微硬度, 高温压缩

Abstract:

In order to study the high temperature and deformation resistance of laser cladding coating on TC4 surface, different proportions of nickel-metal-multi-ceramic composite coatings were prepared on TC4 matrix by laser cladding technology. And GH4169 nickel-based superalloy powder was taken as the base powder, HfC, ZrC, TaC and NbC transition carbides as the reinforcing phase. The microstructure, hardness and high temperature deformation resistance of coatings with different multi-component ceramic powder contents were systematically studied by microstructure characterization and performance experiments. The results show that the addition of carbide ceramic reinforcement phase refines the microstructure of the coating and improves the hardness, and the hardness is the highest when the proportion of ceramic reinforcement phase is 15%, which is 2.54 times that of the substrate. With the increase of temperature, the internal dendrites of the pure nickel-based cladding coating were dissolved and separated, and gradually isoaxed. The dendrite fragmentation appeared in the nickel-based cladding coating supplemented with 15% ceramic powder, and the ceramic strengthened phase dispersed in the cladding layer gathered and grew. Under the conditions of three temperature compression test temperatures (700, 800 and 900 ℃), the maximum equivalent stress and maximum equivalent strain of the specimen appear in the matrix, and compared with the TC4 specimen, the laser cladding specimen produces a stress abrupt change in the coating bonding zone, and the deformation resistance ability of the laser cladding specimen coating is enhanced.

Key words: TC4 titanium alloy, laser cladding, microstructure, microhardness, high temperature compression

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