| Ti-6A1-4V表面激光熔覆钛基复合涂层的微观组织及形成机制 |
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| 引用本文： | 牛伟,孙荣禄,雷贻文,郭喜华.Ti-6A1-4V表面激光熔覆钛基复合涂层的微观组织及形成机制[J].中国激光,2008,35(11):1756-1759. |
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| 作者姓名： | 牛伟 孙荣禄 雷贻文 郭喜华 |
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| 作者单位： | School of Mechanical and Electronic Engineering，Tianjin Polytechnic University，Tianjin Area Major Laboratory of Advanced Mechanical and Electronics Equipment Technology |
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| 基金项目： | This work was supported by China Postdoctoral Science Foundation (No. 20060400700) and Tianjin Technology Development Foundation of Higher Education (No. 20060912). W. Niu’s e-mail address is |
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| 摘 要： | Titanium matrix composite coatings were fabricated on Ti-6A1-4V substrate by laser cladding using powder mixtures of Ti Cr3C2 and Ti TiB2, respectively. The chemical compositions and mi-crostructures of the coatings were analyzed using scanning electron microscope (SEM), energy dispersive spectrometer (EDS) and X-ray diffraction (XRD). Microhardness was measured by a microhardness tester. The results showed that Cr3C2 particles were dissolved and deposited to form dendritic TiC in the upper section and spherical grain TiC in the bottom of Cr3C2 Ti coating. Most of TiB2 was dissolved in the molten pool by laser irradiation, then formed TiB with fine needles and coarse needles in the TiB2 Ti coating. A few quasi-melted TiB2 particles with irregular shape at the bottom of the coating were observed. The average microhardnesses were approximately HV850-V1000, HV800-V1050 in the Cr3C2 Ti and TiB2 Ti coating, respectively, which were 2-3 times higher than that of Ti-6A1-4V substrate.
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| 关 键 词： | 在Ti-6Al-4V基体表面分别激光熔覆Ti+Cr3C2 和Ti+TiB2混合粉末制备出钛基复合涂层。利用X-射线(XRD)、扫描电镜(SEM) 和能谱仪(EDS)对激光熔覆层的微观组织和相成分进行了分析，利用显微硬度计测量了显微硬度。结果表明，在Ti+Cr3C2涂层中，Cr3C2颗粒溶解，析出在涂层顶部为树枝晶，底部为球形颗粒的TiC。在Ti+TiB2涂层中，在激光辐照下大部分TiB2溶解，形成细小和粗大针状的TiB，在涂层底部发现少量未溶的不规则TiB2颗粒。Ti+Cr3C2 和Ti+TiB2涂层的平均显微硬度分别为HV850～HV1000 HV800～HV1050，是Ti-6Al-4V基体的2～3倍。 |
| 收稿时间： | 2008/9/16 |
Microstructure and formation mechanism of titanium matrix composites coating on Ti-6Al-4V by laser cladding |
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| Wei Niu,Ronglu Sun,Yiwen Lei,Xihua Guo.Microstructure and formation mechanism of titanium matrix composites coating on Ti-6Al-4V by laser cladding[J].Chinese Journal of Lasers,2008,35(11):1756-1759. |
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| Authors: | Wei Niu Ronglu Sun Yiwen Lei Xihua Guo |
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| Abstract: | Titanium matrix composite coatings were fabricated on Ti-6Al-4V substrate by laser cladding using powder mixtures of Ti-Cr3C2 and Ti TiB, 2 respectively. The chemical compositions and mi-crostructures of the coatings were analyzed using scanning electron microscope (SEM), energy dispersive spectrometer (EDS) and X-ray diffraction (XRD). Microhardness was measured by a microhardness tester. The results showed that Cr3C2 particles were dissolved and deposited to form dendritic TiC in the upper section and spherical grain TiC in the bottom of Cr3C2 Ti coating. Most of TiB2 was dissolved in the molten pool by laser irradiation, then formed TiB with fine needles and coarse needles in the TiB2 Ti coat-ing. A few quasi-melted TiB2 particles with irregular shape at the bottom of the coating were observed. The average microhardnesses were approximately HV850--HV1000, HV800--HV1050 in the Cr3C2 Ti and TiB2 Ti coating, respectively, which were 2-3 times higher than that of Ti-6Al-4V substrate. |
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| Keywords: | laser technique laser cladding composites coating microstructure mechanism |
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