当前位置:首页 > 预发布刊期->2022年43卷第8期
机械振动对流作用对激光熔覆Ni-WC熔覆层组织和性能影响
Effect of mechanical vibration convection on the microstructure and properties of laser cladding Ni-WC coating
浏览(1808) 下载(0)
- DOI:
- 作者:
- 高中堂,任聪聪,杜立飞,乔竹辉,高志明,张传伟
Zhongtang Gao, Congcong Ren, Lifei Du,Zhuhui Qiao
- 作者单位:
- 西安科技大学
Xi,an University of Science and Technology
- 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熔覆层。借助光学显微镜和扫描电子显微镜分析了有无震动下激光熔覆层的组织以及碳化物析出相演化,运用能谱对元素进行偏析分析。同时,通过显微硬度计分析了熔覆熔覆层有无振动对流作用下硬度变化情况。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 nickel-based WC composite coating was prepared on 35CrMoV alloy surface by laser cladding technology with mechanical vibration field applied. The phase composition, element distribution and micro-structure of the coatings with mechanical vibration convection were characterized by optical microscope, energy disperse spectroscopy and scanning electron microscope, respectively. The hardness changes of cladding coatings under the action of vibration and convection were analyzed by microhardness tester. The results show that the microstructure refinement, dendrite fragmentation and carbide precipitation refinement of cladding layer can be achieved by adding mechanical vibration. Meanwhile, Vibration convection can change the coarse dendrite structure into fine needle structure, and the element distribution of the cladding layer is relatively uniform, and the mechanical properties are improved.