Laser melting treatment of Ni-P surface alloys on mild steel. Influence of initial coating thickness and laser scanning rate
Keywords:Ni-P coating, Microstructure, Laser, Melting, Mild steel
Different thickness Ni-P coatings deposited on mild steel are submitted to laser surface melting at different scanning rates. The microstructure of the alloys is characterized by optical and scanning electron microscopy and microprobe analysis. It is shown that both the initial coating thickness and the laser scanning rate have an influence on the shape, extent and size of the different structures resulting from the solidification process. Thus, when the laser scanning rate increases a progressive refinement of the structure takes place that could even totally block the dendritic growth produced during solidification for a high initial coating thickness.
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