Analysis of pneumatic fine particle peening process by using a high-speed-camera

Tatsuya Ito, Shoichi Kikuchi, Yo Hirota, Atsushi Sasago, Jun Komotori

Research output: Contribution to journalArticlepeer-review

24 Citations (Scopus)


In this study, the peening behavior of shot particles in a fine particle peening (FPP) process such as velocity and impact angles were analyzed by using a high-speed-camera. Results showed that the velocity of shot particles depended on a peening pressure; the higher the peening pressure, the higher the particle velocity. The particle velocity measured in this study was approximately 120 m/s; this was much higher than that of the conventional shot peening (SP) process. This was because the air resistance of shot particles in the FPP process was higher than that of shot particles in the SP process. In order to discuss the surface modification effect of the FPP process, commercial-grade pure iron treated by the FPP process was characterized by micro-Vickers hardness tester and scanning electron microscope (SEM). Thickness of hardened layer treated with higher peening pressure was much higher than that of the lower pressure treated one. The unique microstructure with stratification patterns, which was harder than that of the other part, was observed near the specimen surface. The reason for the microstructural changes by the FPP treatment was discussed based on the kinetic energy of shot particles.

Original languageEnglish
Pages (from-to)3047-3052
Number of pages6
JournalInternational Journal of Modern Physics B
Issue number15-16
Publication statusPublished - 2010 Jun 30


  • Surface treatment
  • fluid dynamics
  • hardness
  • microstructure
  • particle velocity
  • peening

ASJC Scopus subject areas

  • Statistical and Nonlinear Physics
  • Condensed Matter Physics


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