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<p>This study systematically analyzed the impact of shot peening on the surface quality of the SLM-TA15 alloy, elucidating the mechanism of fatigue behavior alteration through microstructural evolution, residual stress distribution, and high-cycle fatigue fracture analysis. The experimental results indicate that a shot peening intensity of 0.35&#xa0;mmA is near the best parameters for the shot peening process, achieving a balance between surface morphology control and subsurface microstructure. The surface tensile residual stress was entirely converted into compressive residual stress, reaching a maximum value of − 900&#xa0;MPa. The sample exhibited the highest fatigue life across various fatigue loads, with a fatigue limit strength of 740&#xa0;MPa, representing a 68.1% increase compared to the non-shot peening sample. The elevated density of dislocations and deformation twins induced by shot peening prolonged the nucleation period of the crack source, whereas the compressive residual stress diminished the rate of stable fracture propagation. Moreover, excessive intensity of shot peening will diminish fatigue performance, leading to a reduction in the strengthening effect. In conclusion, shot peening is an efficacious technique for enhancing the surface stress state and fatigue performance of SLM-TA15 alloy, thereby augmenting the viability of SLM-TA15 alloy components in engineering technology and offering a significant reference for achieving stable quality and high-performance additive manufacturing components.</p>

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Research on Multimodal Microstructural Evolution and Fatigue Performance Enhancement of Selective Laser Melting TA15 Titanium Alloy Induced by Shot Peening

  • 期刊论文

  • 发表日期：

    2025年11月29日

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  • Pengbo Gao,
  • Fei Lv,
  • Deqiao Xie,
  • Yang Liu,
  • Xuesong Gao,
  • Meng Xiao,
  • Zongjun Tian

摘要

This study systematically analyzed the impact of shot peening on the surface quality of the SLM-TA15 alloy, elucidating the mechanism of fatigue behavior alteration through microstructural evolution, residual stress distribution, and high-cycle fatigue fracture analysis. The experimental results indicate that a shot peening intensity of 0.35 mmA is near the best parameters for the shot peening process, achieving a balance between surface morphology control and subsurface microstructure. The surface tensile residual stress was entirely converted into compressive residual stress, reaching a maximum value of − 900 MPa. The sample exhibited the highest fatigue life across various fatigue loads, with a fatigue limit strength of 740 MPa, representing a 68.1% increase compared to the non-shot peening sample. The elevated density of dislocations and deformation twins induced by shot peening prolonged the nucleation period of the crack source, whereas the compressive residual stress diminished the rate of stable fracture propagation. Moreover, excessive intensity of shot peening will diminish fatigue performance, leading to a reduction in the strengthening effect. In conclusion, shot peening is an efficacious technique for enhancing the surface stress state and fatigue performance of SLM-TA15 alloy, thereby augmenting the viability of SLM-TA15 alloy components in engineering technology and offering a significant reference for achieving stable quality and high-performance additive manufacturing components.