材料科学
衍射仪
扫描电子显微镜
微观结构
钼
冶金
等轴晶
涂层
腐蚀
介电谱
电化学
X射线光电子能谱
电子探针
合金
复合材料
化学工程
化学
物理化学
工程类
电极
作者
Qian Li,Qian Wang,Lei Zhang,Dongxu Chen,Liejin Guo,Ji Li,Jun Zhang
标识
DOI:10.1088/2053-1591/ac4e3d
摘要
Abstract Fe-based alloy coatings with different Mo contents were fabricated on 45 steel substrates by laser cladding. X-ray diffractometer (XRD), scanning electron microscopy (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 Fe 2 B to Mo 2 FeB 2 . Mo and Cr tend 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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