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采用等离子熔覆技术将Fe-Ni基高温耐磨合金粉末熔覆到45#圆钢上,制备了Fe-Ni基合金导辊.采用扫描电子显微镜、能谱仪、X射线衍射仪研究了Fe-Ni基合金涂层的组织结构和Fe-Ni基合金导辊的表面失效情况.结果表明:Fe-Ni基高温耐磨涂层组织形态良好,由涂层与基体的结合界面处到涂层的上部其组织由平面晶向树枝晶转变;γ-(Fe,Ni)的含量在涂层中按底部—中部—上部的方向依次降低,而(Cr,Fe)7C3的分布正好相反;Fe-Ni基合金导辊的失效机制为热疲劳开裂和磨粒磨损.
The Fe-Ni-based alloy guide rollers were prepared by plasma cladding the high-temperature wear-resistant Fe-Ni alloy powders onto 45 # round bar by means of scanning electron microscopy, energy dispersive spectroscopy and X-ray diffraction. Ni-based alloy coating and the surface failure of the Fe-Ni-based alloy guide roller were studied.The results show that the microstructure of the Fe-Ni-based high temperature wear-resistant coating is well-formed by the combination of the coating and the substrate to the coating (Cr, Fe) 7C3 in the coating decreases in the order of bottom-middle-upper part and the distribution of (Fe, Ni) The failure mechanism of Ni-based alloy guide rollers is thermal fatigue cracking and abrasive wear.