Microstructure and Properties of Layers Fabricated by Laser Cladding of Ni-Fe-Cr-C-B Alloy Powders
This study employs the spray atomization technique to prepare spherical powders of Ni-Fe-Cr-C-B with varying alloy compositions.Laser cladding technology was utilized to create cladding layers on a 45# Steel substrate.The microstructure,wear resistance,and corrosion resistance of the cladding layers were investigated using X-ray diffraction,scanning electron microscopy,wear tests,and electrochemical methods.The results indicate that all cladding layers exhibited excellent processability,with no cracks or defects observed.As the nickel content increased,the microstructure of the cladding layer transitioned to a predominantly austenitic phase,with precipitated phases formed during metallurgical reactions distributed along the grain boundaries.Additionally,the incorporation of boron led to a refinement of the precipitate sizes,significantly improving both wear and corrosion resistance.
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