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<p>This study systematically investigates the effect of peening time (30, 60, and 90&#xa0;s) on the surface integrity, microstructure, and tensile properties of AZ31 magnesium alloy treated by ultrasonic shot peening (USP) alone and in combination with laser shock peening (LSP + USP). The results show that both treatments induce severe plastic deformation, introducing compressive residual stress and increasing microhardness. With increasing peening time, the maximum compressive residual stress increases from –142 (USP-90&#xa0;s) to –198&#xa0;MPa (LSP + USP-90&#xa0;s), and the maximum microhardness increases from 131.6 to 142.4 HV. Grain size refines from 15.3 (substrate) to 5.3&#xa0;μm (USP-90&#xa0;s) and further to 3.7&#xa0;μm (LSP + USP-90&#xa0;s). The compressive stress layer extends to approximately 1.2&#xa0;mm in depth. Yield strength increases from 152 to 194&#xa0;MPa (USP-90&#xa0;s, + 28%) and to 210&#xa0;MPa (LSP + USP-90&#xa0;s, + 38%), while ultimate tensile strength increases from 245 to 281&#xa0;MPa (USP-90&#xa0;s, + 15%) and 296&#xa0;MPa (LSP + USP-90&#xa0;s, + 21%). Elongation decreases from 18.5 (substrate) to 10.5% (USP-90&#xa0;s) but retains 13.8% under LSP + USP-90&#xa0;s, indicating that LSP pre-treatment mitigates ductility loss. The optimal processing window is 60-90&#xa0;s for USP-only and 30-60&#xa0;s for LSP + USP. The LSP + USP composite treatment offers superior strengthening efficiency and better retention of ductility compared to USP alone.</p>

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Effect of Peening Time on Mechanical Property of Magnesium Alloy Strengthened by Ultrasonic Shot Peening Combined with Laser Shock Peening

  • 期刊论文

  • 发表日期：

    2026年6月19日

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  • Jiayang Gu,
  • Shengyi Zhou,
  • Shuaishuai Yu,
  • Ruiqi Li

摘要

This study systematically investigates the effect of peening time (30, 60, and 90 s) on the surface integrity, microstructure, and tensile properties of AZ31 magnesium alloy treated by ultrasonic shot peening (USP) alone and in combination with laser shock peening (LSP + USP). The results show that both treatments induce severe plastic deformation, introducing compressive residual stress and increasing microhardness. With increasing peening time, the maximum compressive residual stress increases from –142 (USP-90 s) to –198 MPa (LSP + USP-90 s), and the maximum microhardness increases from 131.6 to 142.4 HV. Grain size refines from 15.3 (substrate) to 5.3 μm (USP-90 s) and further to 3.7 μm (LSP + USP-90 s). The compressive stress layer extends to approximately 1.2 mm in depth. Yield strength increases from 152 to 194 MPa (USP-90 s, + 28%) and to 210 MPa (LSP + USP-90 s, + 38%), while ultimate tensile strength increases from 245 to 281 MPa (USP-90 s, + 15%) and 296 MPa (LSP + USP-90 s, + 21%). Elongation decreases from 18.5 (substrate) to 10.5% (USP-90 s) but retains 13.8% under LSP + USP-90 s, indicating that LSP pre-treatment mitigates ductility loss. The optimal processing window is 60-90 s for USP-only and 30-60 s for LSP + USP. The LSP + USP composite treatment offers superior strengthening efficiency and better retention of ductility compared to USP alone.