Effect of Turning on the Surface Integrity and Fatigue Life of a TC11 Alloy in Very High Cycle Fatigue Regime - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Metals Année : 2020

Effect of Turning on the Surface Integrity and Fatigue Life of a TC11 Alloy in Very High Cycle Fatigue Regime

Tao Gao
  • Fonction : Auteur
Hongqian Xue
  • Fonction : Auteur
Zhi Qin
  • Fonction : Auteur
Bin Li
  • Fonction : Auteur
  • PersonId : 760371
  • IdRef : 168508168
Han Zhang
  • Fonction : Auteur

Résumé

In this work, the effect of a turning process on fatigue performance of a Ti-6.5Al-3.5Mo-1.5Zr-0.3Si (TC11) titanium alloy is studied in the high cycle fatigue (HCF) and very high cycle fatigue (VHCF) regimes. For this purpose, the surface characteristics including surface morphology, surface roughness and residual stress were investigated. Moreover, axial fatigue tests were conducted with an ultrasonic fatigue testing system working at a frequency of 20 kHz. The results show that the turning process deteriorated the fatigue properties in both HCF and VHCF regimes. The fatigue strength at 1 × 108 cycles of turned samples is approximately 6% lower than that of electropolished ones. Fracture surface observations indicate that turning marks play a crucial role in the fatigue damage process, especially in the crack initiation stage. It was observed that the crack of all the turned samples originated from turning marks. In addition, the compressive residual stress induced by the turning process played a more effective role in resisting crack propagation in the VHCF regime than in the HCF regime.

Dates et versions

hal-03589714 , version 1 (25-02-2022)

Identifiants

Citer

Tao Gao, Zhidan Sun, Hongqian Xue, Emin Bayraktar, Zhi Qin, et al.. Effect of Turning on the Surface Integrity and Fatigue Life of a TC11 Alloy in Very High Cycle Fatigue Regime. Metals, 2020, 10 (11), pp.1507. ⟨10.3390/met10111507⟩. ⟨hal-03589714⟩
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