摘要
采用光学显微镜,扫描电镜(SEM),X射线衍射(XRD),透射电镜(TEM)和磨粒磨损试验,研究了8%Mo对等离子堆焊钴基合金组织结构和性能的影响。结果表明,堆焊合金层主要是由面心立方的γ(Co)和六方结构的M7C3构成,并且在钴基固溶体中存在着许多堆垛层错。8%Mo的加入,没有改变合金层的相结构,但其亚结构却发生了变化,堆垛层错消失,在钴基固溶体中出现了大量的位错。8%Mo的加入,不但可以细化钴基固溶体和共晶体组织,还可以提高合金层中富Cr碳化物相的相对含量,有助于提高合金层的硬度和耐磨性能。
The effects of 8% Mo on the microstructure and properties of the cobalt-based alloy coating were investigated using optical microscope, scanning electron microscope （SEM）, X-ray diffraction （XRD）, transmission electron microscope （TEM）, and abrasive wear test. It was found that a cobalt-based solid solution with a face-centered cubic crystal structure is presented accompanied by the secondary phase M7C3 with a hexagonal crystal structure in the cobalt-based alloy coating. There are lots of stacking faults existing in this coating. The addition of 8% Mo does not change the phase composition, but the substructure changes from sacking faults into dislocations. The addition of 8% Mo can refine the Co-rich dendrites and Crorich carbides formed in interdendritic region. The mass fraction of Cr-rich carbides slightly increases. All these results are beneficial to increasing the hardness and the wear resistance of the deposited coating.
出处
《稀有金属》
EI
CAS
CSCD
北大核心
2006年第6期740-745,共6页
Chinese Journal of Rare Metals
基金
安徽省高校青年教师科研资助项目(2006jql082)
关键词
等离子堆焊
钴基合金
钼
组织结构
耐磨性
plasma transferred arc （PTA） process
cobalt-based alloy
molybdenum
microstructure
wear resistance
