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An experimental study of waterjet peening on 7075-T6 aluminum alloy was conducted to investigate the effects of waterjet conditions. Erosion surface features caused by high velocity jet impingement were evaluated as functions of standoff distance, jet pressure, and jet velocity. Surface characteristics were evaluated in terms of subsurface work hardening, surface finish and a degree of surface residual stresses. Results show that waterjet peening induces the same level of plastic deformation at the surface layer as shot peening.

To improve the fatigue properties of additive manufactured (AM) titanium alloy Ti6Al4V, cavitation abrasive surface finishing (CASF) was proposed. With CASF, a high-speed water jet with cavitation, i.e. a cavitating jet, was injected into a water-filled chamber, to which abrasives were added. Abrasives accelerated by the jet created a smooth surface by removing un-melted particles on the surface. Simultaneously, cavitation impacts induced by the jet introduced compressive residual stress and work hardening into the surface, similar to cavitation peening. In this study, to demonstrate the improvement of the fatigue properties of AM Ti6Al4V owing to CASF, Ti6Al4V specimens manufactured through direct metal laser sintering (DMLS) and electron beam melting (EBM) were treated using CASF and cavitation peening, and tested using a plane bending fatigue test.