Combining manufacturing of titanium alloy through direct energy deposition and laser shock peening processes

Combined manufacturing of direct energy deposition (DED) and laser shock peening (LSP) exhibits great potentials in repairing titanium alloy components and improving their mechanical properties. In this study, a DEDed repaired sample was fabricated by depositing TA15 powders on a forged TC17 plate, and subjected to a following LSP treatment. The effects of LSP on microstructures, residual stress, and tensile properties of DEDed samples were evaluated. After LSP, a high-level compressive residual stress state (maximum =−596 MPa) and microstructure refinement were induced in the treated surface. The average α phase area decreased from 1.88 μm2 to 0.73 μm2, and much more low angle grain boundaries were induced after LSP. Meanwhile, the corresponding ultimate tensile strength (UTS) was improved by 12.46%. [Display omitted] •Laser shock peening is used on additive manufactured parts to modify microstructure and induce compressive residual stress.•High-density dislocation considerably promotes the microhardness and work hardening rate.•The ultimate tensile strength is improved by 12.46% after laser shock peening.