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激光熔覆原位制备ZrC增强涂层的颗粒行为特征
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上海交通大学机械与动力工程学院,上海交通大学机械与动力工程学院,哈尔滨工业大学先进焊接与连接国家重点实验室,上海交通大学机械与动力工程学院,上海交通大学机械与动力工程学院

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国家自然科学基金资助(项目号51275303)


Behavior Characteristics of In-Situ Formed ZrC Particle Reinforcement Composite Coating by Laser Cladding
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School of Mechanical Engineering,Shanghai Jiao Tong University,School of Mechanical Engineering,Shanghai Jiao Tong University,State Key Laboratory of Advanced Welding and Joining,Harbin Institute of Technology,Harbin,School of Mechanical Engineering,Shanghai Jiao Tong University,School of Mechanical Engineering,Shanghai Jiao Tong University

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    摘要:

    通过添加氧化锆和石墨的混合粉末到镍基合金粉末中,利用激光熔覆技术在中碳钢表面上制备了原位析出ZrC颗粒增强金属Ni基复合涂层。利用扫描电镜(SEM),能谱仪(EDS)和X射线衍射设备(XRD)对涂层的组织、物相和成分进行了观察、分析和探讨。对涂层内部的ZrC颗粒形貌、生成以及生长机理、分布特点进行了分析,探讨了颗粒分布对涂层硬度性能的影响。结果表明,ZrC颗粒在中上部分布较为均匀,主要以三角形和四边类似菱形和长轴形为主,颗粒在对流和界面斥力共同作用下发生的碰撞、烧结以及枝晶间的阻力是成形主因。由于ZrC颗粒以及内部碳化物如M23C6的生成分布,复合涂层的硬度得到了明显的提升,最终其硬度可达HV0.2 720。

    Abstract:

    Through the in-situ synthesizing the doping of zirconium dioxide and graphite, the ZrC particles reinforced NiCrBSi composite coating was produced onto the mild steel by laser cladding. Microstructure, phase constitution of NiCrBSi+Zr composite coating were characterized by scanning electron microscope(SEM), energy dispersive spectrometer(EDS) and X-ray diffractometer(XRD). And the morphology, formation and growth mechanism and distribution of ZrC reinforcements were studied and discussed, and the hardness of coating was investigated as well. The results showed that ZrC reinforcements were uniformly distributed in the upper and middle coating, only little was in the bottom of coating. The morphology of ZrC were mainly consist of triangle, quadrilateral similar to rhombus and long-bar shape, which contributes to obstruction from the interdendritic growth, the collision and sintering caused by high convection and repulsion between solid-liquid interface in the molten pool. Hardness of composite coating was improved by ZrC reinforcements and carbide such as M23C6, which contribute to its high hardness. Finally, the hardness of composite coating can reach to HV0.2 720.

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雍耀维,张翔,傅卫,邓琦林,杨建国.激光熔覆原位制备ZrC增强涂层的颗粒行为特征[J].稀有金属材料与工程,2018,47(5):1625~1630.[Yong Yaowei, Zhang Xiang, Fu Wei, Deng Qilin, Yang Jianguo. Behavior Characteristics of In-Situ Formed ZrC Particle Reinforcement Composite Coating by Laser Cladding[J]. Rare Metal Materials and Engineering,2018,47(5):1625~1630.]
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  • 收稿日期:2016-05-04
  • 最后修改日期:2016-07-20
  • 录用日期:2016-08-18
  • 在线发布日期: 2018-06-08
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