Abstract
A rapidly solidified wear resistant Cr 3Si reinforced metal silicide composite coating was fabricated on a 0.20% C low carbon steel by laser cladding, using CrSiNi elemental powder blends. The microstructure of the coating was characterized by optical microscope (OM), scanning electron microscope (SEM), X-ray diffraction (XRD) and energy dispersive spectrometer (EDS). The wear resistance of the coating was evaluated under dry sliding wear and pin-on-disc abrasive wear test conditions. The microstructure of the coating consists of rapidly solidified Cr 3Si primary dendrites and interdendritic NiCrSi complex silicide solid solution. Due to the rapidly solidified microstructural characteristics and the presence of a large amount of hard Cr 3Si phase, the laser clad Cr 3Si metal silicide composite coating has excellent wear resistance under both dry sliding wear and pin-on-disc abrasive wear test conditions.
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