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<p>To address the critical challenge of wear failure in aviation gears under extreme dry-running conditions, this study systematically investigates the improvement mechanism of laser shock peening without coating (LSPwC) technology on the surface integrity of AISI 9310 gear steel through thermo-mechanical coupling strengthening. A novel three-dimensional thermo-mechanical coupled numerical simulation model was innovatively developed based on the ABAQUS. Through experimental validation, the regulatory mechanisms of laser pulse energy on surface texture characteristics, residual stress, and microhardness were elucidated. Experimental results demonstrate that LSPwC induces a gradient-distributed residual stress field and microhardness profile. The treated specimens exhibit a residual stress layer depth of approximately 180 μm, with a peak residual compressive stress reaching 488.07 MPa. Additionally, a work-hardened layer with a thickness of 700 μm was introduced, resulting in a 9.7% increase in microhardness compared to untreated specimens. Under thermo-mechanical coupling, laser-induced plastic deformation, and martensitic phase transformation are identified as the primary mechanisms for mechanical property enhancement. The simulation model shows high consistency with the experimental results in subsurface residual stress distribution (stress prediction error <InlineEquation ID="IEq3"> <EquationSource Format="TEX">\(\le \)</EquationSource> <EquationSource Format="MATHML"><math> <mo>≤</mo> </math></EquationSource> </InlineEquation> 10%), providing theoretical foundations and process design guidelines for applying LSPwC technology to surface integrity enhancement of aviation transmission components.</p>

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Investigation of the Thermo-Mechanical Coupling Mechanism in Surface Texturing of AISI 9310 Steel Through Laser Shock Peening Without Coating

  • 期刊论文

  • 发表日期：

    2025年10月2日

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  • Zhandiao Yang,
  • Ping Liu,
  • Jun Zhou,
  • Hai Wang

摘要

To address the critical challenge of wear failure in aviation gears under extreme dry-running conditions, this study systematically investigates the improvement mechanism of laser shock peening without coating (LSPwC) technology on the surface integrity of AISI 9310 gear steel through thermo-mechanical coupling strengthening. A novel three-dimensional thermo-mechanical coupled numerical simulation model was innovatively developed based on the ABAQUS. Through experimental validation, the regulatory mechanisms of laser pulse energy on surface texture characteristics, residual stress, and microhardness were elucidated. Experimental results demonstrate that LSPwC induces a gradient-distributed residual stress field and microhardness profile. The treated specimens exhibit a residual stress layer depth of approximately 180 μm, with a peak residual compressive stress reaching 488.07 MPa. Additionally, a work-hardened layer with a thickness of 700 μm was introduced, resulting in a 9.7% increase in microhardness compared to untreated specimens. Under thermo-mechanical coupling, laser-induced plastic deformation, and martensitic phase transformation are identified as the primary mechanisms for mechanical property enhancement. The simulation model shows high consistency with the experimental results in subsurface residual stress distribution (stress prediction error \(\le \) ≤ 10%), providing theoretical foundations and process design guidelines for applying LSPwC technology to surface integrity enhancement of aviation transmission components.