Abstract
In order to analyze high strain produced by laser peening during tens of ns, which can’t be performed in
so short process, the surface profi le of after laser peening with square spots was compared with that with
circle spots, steep sidestep showed high stain and deformation produced in laser peening with square
spot. The microstructure transforming in laser peening titanium alloy Ti-6Al-4V in the center of
shocked zone and at the edge of square spot was researched in this paper. The results showed that
nanometers size crystals were formed at the edge of square spots because of the shearing strain produced
during laser peening of titanium alloy Ti-6Al-4V.
