金属热处理 ›› 2021, Vol. 46 ›› Issue (2): 196-199.DOI: 10.13251/j.issn.0254-6051.2021.02.036

• 表面工程 • 上一篇    下一篇

Ti-6Al-4V合金表面激光熔覆TiAlSi+xB4C涂层的组织及耐磨性

高苑1, 刘冉1, 吴韬2, 马文1, 韵茗香1, 朱远志1   

  1. 1.北方工业大学 机械与材料工程学院, 北京 100144;
    2.浙江机电职业技术学院, 浙江 杭州 310053
  • 收稿日期:2020-07-22 出版日期:2021-02-25 发布日期:2021-05-08
  • 通讯作者: 刘冉,助理研究员,博士,E-mail:liuran@ncut.edu.cn
  • 作者简介:高苑(1993—),女,硕士研究生,主要研究方向为激光表面改性,E-mail:1092457644@qq.com。
  • 基金资助:
    北京市教委科研计划一般项目(KM201910009006);北方工业大学科研启动基金;北京市大学生科学研究与创业行动计划;北方工业大学毓优人才项目

Microstructure and wear resistance of laser clad TiAlSi+xB4C coatings on Ti-6Al-4V alloy

Gao Yuan1, Liu Ran1, Wu Tao2, Ma Wen1, Yun Mingxiang1, Zhu Yuanzhi1   

  1. 1. College of Mechanical and Materials Engineering, North China University of Technology, Beijing 100144, China;
    2. Zhejiang Institute of Mechanical & Electrical Engineering, Hangzhou Zhejiang 310053, China
  • Received:2020-07-22 Online:2021-02-25 Published:2021-05-08

摘要: 利用激光熔覆在Ti-6Al-4V合金表面制备了TiAlSi+xB4C涂层,分析比较不同B4C含量对于涂层显微组织、显微硬度和耐磨性能的影响。结果表明:B4C含量不同,涂层中的物相种类差别不大;涂层的微观形貌由颗粒状晶、层状晶、胞状晶和短棒状晶组成;不同B4C含量涂层的显微硬度分布趋势大致相同,与基材相比均有明显的提高,随着B4C含量的增高,整体上涂层显微硬度逐渐增大,当B4C的含量为8%时,涂层的显微硬度最高,达到1216 HV0.1,约为基体的4.2倍;而当B4C含量过高时,涂层硬度降低,且涂层中出现微裂纹。通过磨损试验表明,不同B4C含量的涂层耐磨损性能均明显的优于Ti-6Al-4V合金基体,含8%B4C的涂层磨损量最小。熔覆不同含量B4C的涂层明显改善了基体Ti-6Al-4V合金的表面性能。

关键词: 激光熔覆, Ti-6Al-4V合金, B4C, 显微组织, 显微硬度, 耐磨性

Abstract: TiAlSi+xB4C coatings were prepared on the surface of Ti-6Al-4V alloy by laser cladding, and the effects of different B4C content on microstructure, microhardness and wear resistance of the coatings were analyzed. The results show that different content of B4C makes little difference in the phase type of the coating. The micro morphology of the clad coating is composed of granular crystals, layered crystals, cell crystals and short rod crystals. The microhardness distribution of the coatings with different content of B4C is about the same, but is obviously improved compared with the substrate. With the increase of B4C content, the microhardness tends to increase on the whole, when the content of B4C is 8%, the microhardness reaches the highest, that is 1216 HV0.1, about 4.2 times of the substrate. However, when the B4C content is much higher, the hardness decreases and microcracks appear. Wear experiments show that the wear resistance of the coatings with different content of B4C is significantly better than that of Ti-6Al-4V alloy substrate, and the coating with 8% B4C has the minimum wear loss. The results show that the cladding of coating with different content of B4C obviously improves the surface properties of the Ti-6Al-4V alloy substrate.

Key words: laser cladding, Ti-6Al-4V alloy, B4C, microstructure, microhardness, wear resistance

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