Aluminizing mechanism on a nickel-based alloy with surface nanostructure produced by laser shock peening and its effect on fatigue strength

A nanocrystalline surface layer with grain sizes ranging between 30 and 150 nm was fabricated on a K417 nickel-based cast alloy by means of laser shock peening (LSP). The effect of the surface nanostructure on the gas aluminizing process was investigated through microstructure characterizations, carried out by transmission electron microscopy (TEM), scanning electron microscopy (SEM) and X-ray diffraction (XRD). The results showed that,...