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

作　　者：高中堂 任聪聪 杜立飞 乔竹辉[2] 高志明 张传伟[1] GAO Zhongtang;REN Congcong;DU Lifei;QIAO Zhuhui;GAO Zhiming;ZHANG Chuanwei(School of Mechanical Engineering,Xi'an University of Science and Technology,Xi'an 710054,China;State Key Laboratory of Solid Lubrication,Lanzhou Institute of Chemical Physics,Chinese Academy of Sciences,Lanzhou 730000,China)

机构地区：[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

出　　处：《铸造技术》2022年第8期641-646,I0030,共7页Foundry Technology

基　　金：国家自然科学基金(51804251,52104384);烟台先进材料与绿色制造山东省实验室基础研究开放课题(AMGM2021F04);西安市科学计划(21XJZZ0041);中国博士后基金(2020M683675XB);陕西省自然科学基金(21JK0761)。

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.

关 键 词：机械振动 对流 激光熔覆 镍基合金 组织 

分 类 号：TG113[金属学及工艺—物理冶金]