TiC含量对TC4合金激光熔覆层组织和性能的影响

doi:10.13251/j.issn.0254-6051.2020.06.044

金属热处理 ›› 2020, Vol. 45 ›› Issue (6): 212-215.DOI: 10.13251/j.issn.0254-6051.2020.06.044

TiC含量对TC4合金激光熔覆层组织和性能的影响

夏思海, 武美萍, 马毅青, 崔宸

江南大学机械工程学院江苏省食品先进制造装备技术重点实验室, 江苏无锡 214122

收稿日期:2019-11-23 出版日期:2020-06-25 发布日期:2020-09-02
通讯作者: 武美萍,教授,博士,E-mail:wmp116699@163.com
作者简介:夏思海(1996—),男,硕士研究生,主要研究方向为激光加工及表面改性,E-mail:277255230@qq.com。
基金资助:
江苏出入境检验检疫局科技计划项目(2017KJ14);装备预研教育部联合基金(6141A0221)

Effect of TiC content on microstructure and properties of laser clad layer on TC4 alloy

Xia Sihai, Wu Meiping, Ma Yiqing, Cui Chen

Jiangsu Key Laboratory of Advanced Food Manufacturing Equipment & Technology, School of Mechanical Engineering, Jiangnan University, Wuxi Jiangsu 214122, China

Received:2019-11-23 Online:2020-06-25 Published:2020-09-02

摘要/Abstract

摘要： 采用激光熔覆工艺在TC4钛合金基体表面制备了添加不同质量分数(0%、2%、4%、6%)TiC的Ni60A复合熔覆层,通过光学显微镜、显微硬度计、X射线衍射仪、摩擦磨损机分析了不同TiC含量对熔覆层组织及性能的影响。结果表明:未添加TiC的熔覆层组织以树枝晶为主,添加TiC后出现了花瓣状物相;XRD分析发现熔覆层中出现了AlCCr₂、Al_0.24B_0.01Ni_0.75等硬质增强相,这些能够显著提高熔覆层的硬度。显微硬度及摩擦磨损试验结果表明,添加TiC的熔覆层平均硬度均较基体硬度有大幅提高,摩擦因数显著降低,且随TiC含量的增加,熔覆层硬度先增加后降低,摩擦因数先降低后增加,4%TiC熔覆层的硬度最大,相比基体提高了213.3%,摩擦因数最小,为0.309 774。

关键词: 激光熔覆, 镍基复合粉末, 显微组织, 显微硬度, 摩擦磨损

Abstract: Ni60A and (2%, 4%, 6%)TiC+Ni60A composite coatings were prepared on the surface of TC4 titanium alloy by laser cladding process. The influence of different TiC mass fractions on the microstructure and properties of the clad layer were analyzed by metallographic microscope, microhardness tester, X-ray diffractometer, and friction-wear machine. The results show that the microstructure of the clad layer without TiC is dominated by dendrites, and the TiC addition leads to the appearance of petal phase. The XRD analysis shows that hard reinforcing phases AlCCr₂, Al_0.24B_0.01Ni_0.75 appear in the clad layer, which can significantly increase the hardness of the clad layer. The results of microhardness and friction and wear tests show that the average hardness of the clad layer with TiC is significantly higher than that of the matrix, and the friction coefficient is significantly reduced. With the increase of TiC content, the hardness of the clad layer increases first and then decreases, while the friction coefficient decreases first and then increases. The hardness of the clad layer with 4% TiC is the highest, which is 213.3% higher than that of the matrix, and the friction coefficient is the lowest, which is 0.309 774.

Key words: laser cladding, Ni-based composite powder, microstructure, microhardness, friction and wear

中图分类号:

TG174

夏思海, 武美萍, 马毅青, 崔宸. TiC含量对TC4合金激光熔覆层组织和性能的影响[J]. 金属热处理, 2020, 45(6): 212-215.

Xia Sihai, Wu Meiping, Ma Yiqing, Cui Chen. Effect of TiC content on microstructure and properties of laser clad layer on TC4 alloy[J]. Heat Treatment of Metals, 2020, 45(6): 212-215.

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TiC含量对TC4合金激光熔覆层组织和性能的影响

Effect of TiC content on microstructure and properties of laser clad layer on TC4 alloy

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