Measuring and testing during shot peening blasting parameters, processes, used and application limits

When shot peening with suitable blasting media, a residual compressive force is induced in the near-surface layer - to an extent depending on the material - through plastic deformation and reorientation of dislocations. At the same time, the surface topography is changed and the hardness of the surface zone is increased. Hardened components experience a partial microstructural transformation through strain hardening (austenite in martensite). To ensure process reliability, it must be possible to check and control the states of stress in the workpieces. Some ways of doing this are outlined in this paper.