离心泵叶轮表面激光熔覆(Ti,W)C颗粒增强Ni基熔覆层分析  

Analysis of Laser Cladding(Ti,W)C Particle Reinforced Ni Base Cladding Layer on Impeller Surface of Centrifugal Pump

作　　者：张丽珠 李峰 Zhang Lizhu;Li Feng(Tianshui Water Bureau,Tianshui 741000,Gansu,China;School of Materials Science and Engineering,Lanzhou University of Technology,Lanzhou 730050,Gansu,China)

机构地区：[1]天水市水务局,甘肃天水741000 [2]兰州理工大学材料科学与工程学院,甘肃兰州730050

出　　处：《应用激光》2023年第9期9-14,共6页Applied Laser

摘　　要：为提高离心泵叶轮表面激光熔覆Ni基熔覆层的性能,通过添加(Ti, W)C颗粒方式对其加强。对WC硬质相以及Ni基合金显微组织进行了表征,并对其耐磨性进行了测试。研究结果表明,制备形成了具有致密结构的熔覆层,整体组织形态较均匀。(Ti, W)C颗粒在高能量密度的激光作用下部分重熔,并与熔化的镍基粉末以及重熔的45钢基体发生凝固反应生成新的物相。在熔覆层的表面存在Fe_(3)Ni、Cr_(23)C_(6)与W_(2)C等物相。熔覆层合金区显微维氏硬度为623 HV,相对于45钢基体硬度获得了显著提升。(Ti, W)C颗粒增强Ni基熔覆层摩擦系数为0.32,与基体相比减小了47.2%;磨损量减小为9.67 mg,与45钢30.83 mg相比显著减小。熔覆层表面磨痕处存在不同尺寸颗粒,没有形成犁沟结构。磨痕内含有C、Ni、W、Cr化合物,可以有效保护基体组织,使其获得更强耐磨性。In order to improve the performance of laser cladding Ni-based cladding layer on impeller surface of centrifugal pump,(Ti,W)C particles were added.The microstructure of WC hard phase and Ni base alloy was characterized,and the wear resistance was tested.The results showed that the cladding layer with dense structure is formed and the overall microstructure is uniform.The(Ti,W)C particles are partially remelted by laser with high energy density and solidified with the melted nickel-based powder.The remelted 45 steel matrix solidifies and forms a new phase.There are Fe_(3)Ni,Cr_(23)C_(6),and W2C phases on the surface of the cladding layer.The microhardness of the cladding layer is 623 HV,which is significantly higher than that of 45 steel.The friction coefficient of(Ti,W)C particle reinforced Ni-base cladding layer is 0.32,which is reduced by 47.2%compared with the matrix.Compared with 30.83 mg of 45 steel,the wear amount decreased to 9.67 mg.There are grains of different sizes on the surface of the cladding layer,and no furrow structure is formed.The wear marks contain C,Ni,W,and Cr,which can effectively protect the matrix structure and make it show better wear resistance.

关 键 词：激光熔覆 WC/Ni基合金复合熔覆层 摩擦因数 磨粒磨损 

分 类 号：TG174[金属学及工艺—金属表面处理]