Abstract
Fine particle peening was examined about the effective factor to modification of metal microstructure as compared with conventional shot peening. Specifically, collision simulation was performed by the finite-element method based on the particle flight velocity measured with a high-speed camera. The influence of particle flight velocity on plastic deformation of the matrix in shot peening was examined. The results indicated that the plastic strain of the matrix on particle collision was not related to the size of particles, but showed an increasing tendency with increasing particle flight velocity. These observations indicated that the flight velocity of particles is an important factor governing plastic strain of the matrix. Moreover, the total plastic deformation energy around a plastic deformation range tended to increase with smaller particle size.
