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<p>Ultrasonic shot peening (USP) is a technique that utilizes high-frequency mechanical impacts to induce dislocations and refine grains in the material surface layer, thereby creating a gradient nanostructure for surface enhancement. In this study, SEM, TEM, XRD, EDS, and an electrochemical workstation were employed to investigate the surface morphology, microstructure, mechanical properties, and electrochemical performance. A systematic investigation was conducted on the effects of different USP times on the microstructure and properties of EH36 steel, and the fine-grained strengthening mechanism was revealed. Experimental results demonstrated that 15&#xa0;min of USP treatment increased the maximum surface microhardness by 67% while significantly improving wear resistance. Notably, the self-corrosion current density decreased by 85.14% compared to untreated samples. This research lays a theoretical foundation for the subsequent development of composite strengthening processes.</p>

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Effect of ultrasonic shot peening time on microstructure evolution and surface properties of EH36 steel

  • 期刊论文

  • 发表日期：

    2026年4月12日

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  • Lingling Liu,
  • Siyu Xun,
  • Zixin Huang,
  • Xiang Wang,
  • Xiaoxian Li,
  • Xuehui Zhang

摘要

Ultrasonic shot peening (USP) is a technique that utilizes high-frequency mechanical impacts to induce dislocations and refine grains in the material surface layer, thereby creating a gradient nanostructure for surface enhancement. In this study, SEM, TEM, XRD, EDS, and an electrochemical workstation were employed to investigate the surface morphology, microstructure, mechanical properties, and electrochemical performance. A systematic investigation was conducted on the effects of different USP times on the microstructure and properties of EH36 steel, and the fine-grained strengthening mechanism was revealed. Experimental results demonstrated that 15 min of USP treatment increased the maximum surface microhardness by 67% while significantly improving wear resistance. Notably, the self-corrosion current density decreased by 85.14% compared to untreated samples. This research lays a theoretical foundation for the subsequent development of composite strengthening processes.