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机械振动对Ni-WC激光熔覆层组织和性能的影响
Effect of Mechanical Vibration on Microstructure and Properties of Ni-WC Laser Cladding Layer
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- DOI:
- 作者:
- 高中堂 1 ，任聪聪 1 ，杜立飞 1 ，乔竹辉 2 ，高志明 1 ，张传伟 1
GAO Zhongtang1 , REN Congcong1 , DU Lifei1 , QIAO Zhuhui2 , GAO Zhiming1 , ZHANG Chuanwei1
- 作者单位:
- 1. 西安科技大学 机械工程学院，陕西 西安 710054；2. 中国科学院 兰州化学物理研究所，甘肃 兰州 730000
1. School of Mechanical Engineering, Xi'an University of Science and Technology, Xi'an 710054, China; 2. State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China
- 关键词:
- 机械振动；对流；激光熔覆；镍基合金；组织
mechanical vibration; convection; laser cladding; Ni-based alloy; microstructure
- 摘要:
- 采用外加机械振动产生对流的方法，通过激光熔覆技术在 35CrMoV 合金表面制备镍基复合熔覆层。 借助
光学显微镜和扫描电子显微镜分析了有无振动下激光熔覆层的组织以及碳化物析出相演化，运用扫描电镜中能谱仪对
元素进行了偏析分析。 同时，通过显微硬度计分析了熔覆层有无振动对流作用下硬度的变化情况。 结果表明，机械振动
可使熔覆层组织细化、枝晶碎化以及碳化物析出细化，振动对流作用使粗大的枝晶组织变成了细小的细针状组织，熔覆
层的元素分布相对均匀，力学性能有所提高。
The Ni-base composite cladding layer was prepared on 35CrMoV alloy surface by laser cladding technology by means of convection generated by external mechanical vibration. The microstructure of the laser cladding layer and the evolution of carbide precipitates were analyzed by means of optical microscopy and scanning electron microscopy, and the segregation of elements was analyzed by energy dispersive spectrometer in scanning electron microscopy. At the same time, the hardness changes of the cladding layer under the action of vibration and convection were analyzed by microhardness tester. The results show that mechanical vibration can cause microstructure refinement, dendrite fragmentation and carbide precipitation refinement of the cladding layer, and vibration convection can make the coarse dendrite structure become fine needle structure, and the element distribution of the cladding layer is relatively uniform, and the mechanical properties of the cladding layer are improved.