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TC4表面丝粉同步激光熔覆制备复合材料层微观组织研究
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哈尔滨工业大学先进焊接与连接国家重点实验室,哈尔滨工业大学先进焊接与连接国家重点实验室,哈尔滨工业大学先进焊接与连接国家重点实验室,哈尔滨工业大学先进焊接与连接国家重点实验室

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TG174.453

基金项目:

国家自然科学基金项目(面上项目,重点项目,重大项目)


Microstructure Study of Compound Layer Fabricated by Coincident Wire-powder Laser Cladding on TC4 Surface
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State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology,State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology,State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology,State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology

Fund Project:

National Ministry of Science and Technology International Cooperation (2007 DFA71490)

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    摘要:

    针对Ti-6Al-4V耐磨性差的问题,本文采用激光熔覆技术在Ti-6Al-4V基材表面通过旁轴添加与基材同质的Ti-6Al-4V丝材,同轴送入WC颗粒作为强化相的方式制备表面WC颗粒增强钛基复合材料层。激光功率、扫描速度、送丝速度等工艺参数是影响复合材料层成形的主要工艺因素,通过实验确定了优化的工艺参数。采用SEM,EDS以及XRD对复合材料层的显微组织进行了研究。复合材料层中主要包括WC、W2C、TiC、α-Ti、W相。研究表明,复合材料层中WC颗粒呈现不同形态。TiC、W2C相形成并以不同形态分布于表面复合材料层中。WC颗粒与Ti之间的反应区由多层组成,分别为W2C、W、TiC。性能分析发现,复合材料层的硬度达到了570HV0.2,较基体提高了一倍。表面复合材料层的摩擦系数为0.3,而钛基体的摩擦系数为0.5。与基体相比,表面复合材料层摩擦系数显著降低。

    Abstract:

    The aim of this paper was to overcome the problem of the poor tribological properties such as high friction coefficient and low hardness of Ti6Al4V. Cladding of metal matrix composites (MMC) layer on Ti-6Al-4V substrate by coincident wire-powder laser deposition was conducted in the paper. During experiment, powder was fed from a coaxial nozzle and wire was fed from a lateral nozzle into the deposition melt pool. Microstructure of compound layer was analyzed by SEM, EDS, XRD. It has shown that compound layer mainly comprises WC, W2C, TiC, α-Ti, W phase. TiC、W2C phase was formed with different morphology at different location of MMC layer. W2C, W and TiC layer can be found at the interface of WC/Ti matrix,. The hardness of compound layer is 570HV0.2 ,which is about 2 times of the hardness of substrate. The friction coefficient of MMC layer was 0.3, while the friction coefficient of Ti substrate was 0.5. Compared to the substrate, the friction coefficient of MMC layer reduced distinctively.

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李福泉,高振增,李俐群,陈彦宾. TC4表面丝粉同步激光熔覆制备复合材料层微观组织研究[J].稀有金属材料与工程,2017,46(1):177~182.[lifuquan, Gao Zhenzeng, Li Liqun, Chen Yanbin. Microstructure Study of Compound Layer Fabricated by Coincident Wire-powder Laser Cladding on TC4 Surface[J]. Rare Metal Materials and Engineering,2017,46(1):177~182.]
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  • 收稿日期:2014-10-08
  • 最后修改日期:2014-10-19
  • 录用日期:2014-11-21
  • 在线发布日期: 2017-03-16
  • 出版日期: