Surface mechanical properties of S30432 austenitic steel after shot peening

► The surface yield strength of S30432 austenite steel after conventional and dual shot peening has been investigated by X-ray stress analysis method. ► Both shot peening treatment could greatly improve the surface yield strength. ► The improved yield strength is then discussed in terms of microstructure in the deformed layer. ► Refined domain size and high micro-strain and high density of dislocation are induced in the deformed layer.