Microstructure evolution and high temperature corrosion behavior of FeCrBSi coatings prepared by laser cladding

In this study, an FeCrBSi coating was deposited on a stainless steel substrate by laser cladding with a 6 kW CO2 laser to improve the hardness and corrosion resistance. The phase composition, microstructure evolution and chemical composition of the coating were investigated via X-ray diffraction (XR...

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Bibliographic Details
Published in:Ceramics international 2020-08, Vol.46 (11), p.17233-17242
Main Authors: Wang, Qian, Chen, Fa Qiang, Zhang, Liang, Li, Ji Dong, Zhang, Jun Wei
Format: Article
Language:English
Subjects:
Corrosion behavior
FeCrBSi coating
Laser cladding
Microstructure evolution
Molten aluminum
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Summary:In this study, an FeCrBSi coating was deposited on a stainless steel substrate by laser cladding with a 6 kW CO2 laser to improve the hardness and corrosion resistance. The phase composition, microstructure evolution and chemical composition of the coating were investigated via X-ray diffraction (XRD), confocal scanning laser microscopy (CSLM), scanning electron microscopy (SEM) and energy dispersive X-ray spectrometer (EDX). Microhardness and high temperature corrosion tests in molten aluminum were also conducted for evaluating the properties of the coating. The XRD pattern suggested that the coating was particularly composed of martensite, (Fe, Cr)7C3 and CrFeB hard phases. The microstructure results exhibited that equiaxed dendrites, dendrite networks, columnar dendrites, cellular and planar grains were distributed from the surface to the bottom of the coating. The hardness of the substrate increased from 217 HV0.2 to 762 HV0.2. Moreover, the laser cladding FeCrBSi coating exhibited good corrosion resistance in molten aluminum, thereby making it a promising candidate in the surface modification and protection of hot dip aluminum equipment.
ISSN:0272-8842
1873-3956
DOI:10.1016/j.ceramint.2020.04.010