The Use Of A Dynamic Imaging System To Characterize Particle Size And Shape For Shot Peening Media

Shot peening is a cold working process that enhances the mechanical properties of components such as springs, axles, and gears. Shot media are projected at a high velocity against the material’s surface, creating a layer of compressive residual stress that improves fatigue and wear resistance of the material. The size and shape of the media affect the residual stress layer that is created. To ensure consistent quality, it is critical to characterize and control the particle size and shape distribution of the shot media, both as-manufactured and in the working mix. This paper presents how the use of a dynamic imaging system developed by J.M. Canty can provide the size and shape measurements that are necessary for an efficient shot peening process.