为了在碳钢表面获得具有耐磨和耐蚀性能的铁基涂层，采用CO2气体激光在45#钢表面制备了D577合金激光熔覆涂层。采用扫描电镜(SEM)、能谱仪(EDS)、X射线衍射仪(XRD)、显微硬度计和往复摩擦磨损试验机分析了熔覆层的显微组织，测试了涂层的硬度和摩擦磨损性能。试验结果表明，涂层由单相奥氏体组成，涂层与基体形成了良好的冶金结合，无裂纹、气孔等缺陷；涂层显微硬度达630~650 HV，纳米压痕硬度为8.58 GPa，弹性模量为235.82 GPa；D577合金激光熔覆层可以明显改善基体45#钢的耐磨性和电化学腐蚀性能。

In order to obtain wear and corrosion resistant Fe-based alloy coating, laser cladding of D577 alloy powder on 45# steel is conducted using CO2 laser. The microstructure, hardness, friction and wear performance are investigated by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), X-ray diffractometer (XRD), micro-hardness meter, and reciprocating wear test machine. The experimental results show that the coating consists of γ-Fe single phase, there is a good metallurgical bond between coating and substrate, and the coating is free of crack and pore defect. The micro-hardness of the coating is 630~650 HV. The nano-hardness and elastic modulus of the coating are 8.58 GPa and 235.82 GPa, respectively. D577 alloy laser cladding coating can effectively improve the wear resistance and electrochemical corrosion performance of 45# steel substrate.