Product Code: ICA12_P120

Effects of Laser-Peening Parameters on Plastic Deformation of SUS316L
Authors:
Kohei Mizuta, Program in Electronic Engineering, Interdisciplinary Graduate Faculty of Science and Engineering, Kinki Univ.; Osaka Japan
Miho Tsuyama, Program in Electronic Engineering, Interdisciplinary Graduate Faculty of Science and Engineering, Kinki Univ.; -
Makoto Takahaski, Joining and Welding Research Institute, Osaka Univ.; -
Toshiya Shibayanagi, Program in Materials Science and Engineering, Faculty of Engineering, Toyama Univ.; -
Hitoshi Nakano, Program in Electronic Engineering, Interdisciplinary Graduate Faculty of Science and Engineering, Kinki Univ.; -
Presented at ICALEO 2012

Laser peening is a surface treatment technique that improves the mechanical performance of metals. For instance, it can be used for resistance to crack initiation, extended fatigue life, and enhanced fatigue strength. These effects are based on the production of layer of compressive residual stress due to plastic deformation caused by shock waves resulting from the expansion of plasma by an intense laser irradiation. We have investigated effects of laser-peening parameters on plastics deformation of metals. The laser-peening parameters consist of laser irradiation condition, pressure of laser-produced plasma and laser-induced shock wave, and initial state of target materials. Each parameter should be optimized for efficient laser peening. In the experiments, test sample are prepared from SUS316L annealed at the temperature maintained at 1100 degree. Second harmonic of Nd:YAG laser having the pulse duration of 4 ns has been used for the experiments. Vickers microhardness was used to probe the work hardening due to the plastics deformation. Effects of laser-peening parameters on work hardening will be presented at the meeting.