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<p>The surface integrity and fretting fatigue behavior of Ti6Al4V dovetail structure treated by shot peening (SP), salt spray corrosion (SS) and shot peening combined with salt spray corrosion (SP+SS), respectively, were studied. The findings indicate that SP introduces residual compressive stress (RCS) layer and hardened layer. The SS causes the development of pitting pits and corrosion products, also induces localized pitting corrosion in SP samples, triggering the release of RCS introduced by SP. Compared with AS samples, the fatigue lifetime of SP and SS samples are, respectively, increased and decreased, and the cracks initiation and propagation mechanisms are changed. Compared with SP samples, the fatigue lifetime of SP+SS samples was reduced but the fatigue damage mechanism did not change. SP treatment benefits from the plastic deformation caused by surface dislocations, which improves the crack initiation life. SS treatment generates the corrosion pits of surface, manifested as notch effect and reduces the crack initiation life.</p>

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Fretting fatigue behavior of Ti6Al4V dovetail structure under shot peening and salt spray corrosion treatment

  • 期刊论文

  • 发表日期：

    2026年2月24日

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  • Zheng Wang,
  • Zhiguo Wang,
  • Yongfeng Zheng,
  • Kai Sun,
  • Shi Chen,
  • Xiuyang Fang,
  • Zhenbing Cai

摘要

The surface integrity and fretting fatigue behavior of Ti6Al4V dovetail structure treated by shot peening (SP), salt spray corrosion (SS) and shot peening combined with salt spray corrosion (SP+SS), respectively, were studied. The findings indicate that SP introduces residual compressive stress (RCS) layer and hardened layer. The SS causes the development of pitting pits and corrosion products, also induces localized pitting corrosion in SP samples, triggering the release of RCS introduced by SP. Compared with AS samples, the fatigue lifetime of SP and SS samples are, respectively, increased and decreased, and the cracks initiation and propagation mechanisms are changed. Compared with SP samples, the fatigue lifetime of SP+SS samples was reduced but the fatigue damage mechanism did not change. SP treatment benefits from the plastic deformation caused by surface dislocations, which improves the crack initiation life. SS treatment generates the corrosion pits of surface, manifested as notch effect and reduces the crack initiation life.