2010•Cailiao rechuli xuebaoRequires access

Microstructure of laser clad Fe-Cr-Ni-C-Si-Mo coatings treated at high temperature

Yunshan Wang

Abstract

Influence of high temperature treatment on microstructure of Fe-Cr-Ni-C-Si-Mo alloy coatings by laser cladding were investigated by means of optical microscope,scanning electron microscopy with energy spectrometer,X-ray diffraction and thermodynamic calculation using thermo-calc software.The results show that the clad coatings mainly consist of γ(Fe,Ni,Cr) and(Cr,Fe)7 C3 alloy compounds.No significant change of the microstructure is observed when the treating temperature is lower than 750 ℃.However,(Cr,Fe)23 C6 compound precipitates in the coatings when treated at 850 ℃ and its transformation process is discussed.It is found that the transformed(Cr,Fe)23C6 compound particles remain fine after heat treatment at 850 ℃.

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Key concepts: Microstructure, Materials science, Scanning electron microscope, Alloy, Optical microscope, Metallurgy, Diffraction, Cladding (metalworking)