Microstructure, wear and electrochemical behaviors of laser cladding Fe-based coatings with various molybdenum contents
Microstructure, wear and electrochemical behaviors of laser cladding Fe-based coatings with various molybdenum contents
复制标题
不同钼含量激光熔覆铁基涂层的显微组织、磨损及电化学行为
DOI：
10.1088/2053-1591/ac4e3d
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发表时间：
2022-01
影响因子：
2.3
通讯作者：
Jun Wei Zhang
中科院分区：
文献类型：
--
作者：
Qian Li;Qian Wang;Liang Zhang;Dong Xu Chen;Hui Jin;Ji Dong Li;Jun Wei Zhang
采用激光熔覆技术在45种钢基体上制备了不同Mo含量的铁基合金涂层。利用x射线衍射仪（XRD）、扫描电镜（SEM）和能谱仪（EDS）分析了涂层的相组成和微观组织演变。利用球盘式磨损试验机和电化学工作站，分析了Mo添加量对涂层磨损和电化学行为的影响。结果表明，Mo的加入有助于细化晶粒，促进枝晶向等轴晶转变。随着Mo含量的增加，硬相由Fe2B变为Mo2FeB2。Mo和Cr倾向于在晶间区以硬相的形式聚集。当Mo含量为4.8 wt%时，硬度比基体提高3.6倍。Mo的加入提高了涂层的耐磨性。Mo起到了细晶强化和固溶强化的作用，有利于提高硬度和耐磨性。极化曲线和电化学阻抗谱测试结果表明，Mo的加入可以提高铁基涂层的耐蚀性。
Fe-based alloy coatings with different Mo contents were fabricated on 45 steel substrates by laser cladding. X-ray diffractometer (XRD), scanning electron microscope (SEM) and energy dispersive spectrometer (EDS) were used to analyze the phase composition and microstructural evolution of the coatings. The effects of Mo addition on the wear and electrochemical behaviors of the coatings were analyzed by ball-on-disc wear tester and electrochemical workstation. The results showed that the addition of Mo could help refine grains and promote the transition of dendrites to equiaxed grains. With the increase of Mo content, the hard phases changed from Fe2B to Mo2FeB2. Mo and Cr tended to aggregate in the intercrystalline regions in the form of hard phases. When the Mo content was 4.8 wt%, the hardness increased by 3.6 times compared with that of the substrate. The wear resistance of the coatings increased with the Mo addition. Mo played the role of fine grain strengthening and solid solution strengthening, which was beneficial for the improvement of the hardness and wear resistance. Polarization curves and electrochemical impedance spectroscopy test results revealed that the addition of Mo could improve the corrosion resistance of Fe-based coating.
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