For shaft journal remanufacturing of steam turbine rotor by laser cladding,Fe-based alloy cladding experiment was performed by a 2 kW laser diode with coaxial powder feeder,and the temperature near the working point was monitored during the process of laser cladding.The microstructure morphologies,phase structure and composition of the laser remanufacturing layer were analyzed by scanning electronic microscopy(SEM),the X-ray diffraction(XRD)and energy dispersive spectrometer(EDS).The results show that the heating of laser cladding is relatively concentrated,and the maximum temperature is not more than 70 ℃.The microstructure of Fe-based alloy cladding layer is homogeneous and compact.The cladding layer is well combined with the substrate without gas holes and cracks.The microstructure of the cladding layer consists of alloys(Fe,Cr,C)and CrC phases.The microstructure of the cladding layer is composed of a typical supersaturated solid solution dendrites and interdendritic multiple eutectic carbides,and element mutual infiltration is found between substrate and laser cladding layer.