Strengthening characteristics in TC17 titanium alloy treated during LSP

The objective was to address the strengthening characteristics in TC17 titanium alloy treated during laser shock processing (LSP) by simulation and experiment. A simulation model with the size of 4 mm × 4 mm×2 mm during LSP was established by ANSYS/LS-DYNA. The propagation characteristics of stress waves and residual stresses were simulated, and the residual stresses were also measured by an X-ray stress. The influence rules of different spot overlap ratios on the residual stresses were analyzed, and the distribution laws of residual stresses on the model surface were obtained in uniaxial direction. Further, the impact effect was discussed when the spot overlap ratio was 60 % by experimental test and fractographic observation. Simulation and experimental results explained that the plastic deformation layer on the model surface became more even with the increase of spot overlap ratio, and impact unevenness was greatly reduced. Especially, the residual compressive stress was greatly increased when adopting 60 % overlap ratio, the maximum residual compressive stress could be reached 691 MPa, and a stable plastic deformation layer was formed on the model surface.