Multiscale Simulation of Shot-Peening-Assisted Low-Pressure Cold Spraying Based on Al-Zn-Al2O3 Coatings

Low-pressure cold spraying has gained much significance for its good economy in recent years. However, compared with high-pressure spraying, the unsatisfactory performance of coatings prepared by this method is a key problem restricting further development. To improve properties coating without incorporating severe conditions, paper proposed an original shot-peening-assisted low-pressure cold-spraying (i.e., SP-LPCS). By proceeding and shot peening alternately, SP-LPCS was proved to enhance mechanical property effectively. Mixed particles Zn, Al, Al2O3 were adopted as powder. Effects shot-peening pressure, flow rate, size on micromorphology microhardness variance studied. Results shows that thickness plastic deformation layer stabilizes impact time increases 6. The microscopic simulation according different metal characteristics powder, brittle grains fracture while go through refinement. Meanwhile, porosity decreases greatly after impacts, resulting higher denseness coating. Several factors mutually contribute improvement material increased SP-LPCS, obvious strengthening belts observed, highest being 90.93Hv.