Effect of Mechanical Vibration on Microstructure and Properties of Ni-WC Laser Cladding Layer

Author of the article:GAO Zhongtang1 , REN Congcong1 , DU Lifei1 , QIAO Zhuhui2 , GAO Zhiming1 , ZHANG Chuanwei1

Author's Workplace：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

Key Words：mechanical vibration; convection; laser cladding; Ni-based alloy; microstructure

Abstract：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.