高级检索
李明喜, 修俊杰, 赵庆宇, 何宜柱. 钼对钴基合金激光熔覆层组织与耐磨性的影响[J]. 焊接学报, 2009, (11): 17-20.
引用本文: 李明喜, 修俊杰, 赵庆宇, 何宜柱. 钼对钴基合金激光熔覆层组织与耐磨性的影响[J]. 焊接学报, 2009, (11): 17-20.
LI Mingxi, XIU Junjie, ZHAO Qingyu, HE Yizhu. Effect of Mo content on microstructure and wear resistance of Co-based coatings by laser cladding[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2009, (11): 17-20.
Citation: LI Mingxi, XIU Junjie, ZHAO Qingyu, HE Yizhu. Effect of Mo content on microstructure and wear resistance of Co-based coatings by laser cladding[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2009, (11): 17-20.

钼对钴基合金激光熔覆层组织与耐磨性的影响

Effect of Mo content on microstructure and wear resistance of Co-based coatings by laser cladding

  • 摘要: 利用激光熔覆技术在低碳钢基体表面制备了钴基合金涂层.利用金相显微镜(OP)、扫描电镜(SEM)及X射线衍射仪(XRD)等研究了不同Mo元素含量的钴基合金涂层的组织结构;通过采用显微硬度试验、滑动磨损试验等方法进行性能测试.结果表明,含5.4%Mo的合金熔覆层主要组成相为-γCo,Cr23C6,而含28%Mo的合金涂层主要相组成为-γCo,Cr23C6,Co3Mo2Si和NiCoCr等相;含5.4%Mo涂层的组织主要为柱状生长树枝晶;含28%Mo单道涂层的结合区为紊乱的粗大树枝晶,中部为向上生长的细小的树枝晶,表层为细小的等轴晶,多道搭接涂层组织为细小的等轴晶;含28%Mo涂层的显微硬度可达800 HV以上,比含5.4%Mo涂层的硬度提高了一倍;耐磨性也有不同程度的提高.

     

    Abstract: Co-based alloy coatings with different Mo content(5.4% and 28%) on the surface of low carbon steel were prepared by laser cladding.The microstructure and phases composition of the coatings were investigated by means of optical microscope(OP), scanning electron microscope(SEM) and X-ray diffraction instrument(XRD).Microhardness and sliding wear resistance of the coatings were also tested.The results indicated that the main phases in Co-based alloy coatings with 5.4%Mo were γ-Co and Cr23C6.Another two phases of Co3Mo2Si and NiCoCr were identified in Co-based alloy coatings with 28% Mo.Directional dendrite was observed in Co-based alloy coatings with 5.4% Mo.Unidirectional dendrite at the interface, followed by fine dendrite at the central zone and equiaxed grain near top surface were found in Co-based alloy single coatings with 28% Mo, and almost all fine equiaxed grains appear in the multi-track coatings.The microhardness of Cobased alloy coatings with 28% Mo reaches up to 800 HV, which was 2 times of that of Co-based alloy coatings with 5.4% Mo.The sliding wear resistance was also improved.

     

/

返回文章
返回