Influence of grinding and shot-peening on the near-surface microstructure of a maraging stainless steel

The near-surface properties of maraging steels are key to controlling their mechanical properties. They can be tailored by surface treatments such as shot peening and also influenced prior machining. This study aims at determining the respective roles grinding processes on microstructure Custom 465 stainless steel. A combination experimental techniques, including X-ray diffraction (XRD), transmission electron microscopy (TEM), atom probe tomography (APT) provides an in-depth characterization initial its modifications. results show that in a very shallow nano-crystalline region less than 1 µm thick, which contains high fraction retained austenite where most Ni3Ti precipitates initially present, have been dissolved. Shot peening, other hand, moderate localized strain close surface, deeper destabilization decreases from ?5% ?2% first 100 below surface. It has no visible effect precipitate microstructures. different mechanisms may cause these modifications discussed.