Effect of Turning on the Surface Integrity and Fatigue Life of a TC11 Alloy in Very High Cycle Fatigue Regime
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 roughn...
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doaj-3932aea34f2d45f0a9e311f7eb86f4f62020-11-25T04:07:03ZengMDPI AGMetals2075-47012020-11-01101507150710.3390/met10111507Effect of Turning on the Surface Integrity and Fatigue Life of a TC11 Alloy in Very High Cycle Fatigue RegimeTao Gao0Zhidan Sun1Hongqian Xue2Emin Bayraktar3Zhi Qin4Bin Li5Han Zhang6School of Mechanical Engineering, Northwestern Polytechnical University, Xi’an 710072, ChinaICD, P2MN, LASMIS, University of technology of Troyes, CNRS FRE2019 Troyes, FranceSchool of Mechanical Engineering, Northwestern Polytechnical University, Xi’an 710072, ChinaSchool of Mechanical and Manufacturing Engineering, Supmeca-Paris, 93407 Paris, FranceSchool of Mechanical Engineering, Northwestern Polytechnical University, Xi’an 710072, ChinaSchool of Mechanical Engineering, Northwestern Polytechnical University, Xi’an 710072, ChinaSchool of Mechanical Engineering, Northwestern Polytechnical University, Xi’an 710072, ChinaIn 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 × 10<sup>8</sup> 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.https://www.mdpi.com/2075-4701/10/11/1507titanium alloyturning surface integrityfatigue strengthvery high cycle fatiguedamage mechanism |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Tao Gao Zhidan Sun Hongqian Xue Emin Bayraktar Zhi Qin Bin Li Han Zhang |
spellingShingle |
Tao Gao Zhidan Sun Hongqian Xue Emin Bayraktar Zhi Qin Bin Li Han Zhang Effect of Turning on the Surface Integrity and Fatigue Life of a TC11 Alloy in Very High Cycle Fatigue Regime Metals titanium alloy turning surface integrity fatigue strength very high cycle fatigue damage mechanism |
author_facet |
Tao Gao Zhidan Sun Hongqian Xue Emin Bayraktar Zhi Qin Bin Li Han Zhang |
author_sort |
Tao Gao |
title |
Effect of Turning on the Surface Integrity and Fatigue Life of a TC11 Alloy in Very High Cycle Fatigue Regime |
title_short |
Effect of Turning on the Surface Integrity and Fatigue Life of a TC11 Alloy in Very High Cycle Fatigue Regime |
title_full |
Effect of Turning on the Surface Integrity and Fatigue Life of a TC11 Alloy in Very High Cycle Fatigue Regime |
title_fullStr |
Effect of Turning on the Surface Integrity and Fatigue Life of a TC11 Alloy in Very High Cycle Fatigue Regime |
title_full_unstemmed |
Effect of Turning on the Surface Integrity and Fatigue Life of a TC11 Alloy in Very High Cycle Fatigue Regime |
title_sort |
effect of turning on the surface integrity and fatigue life of a tc11 alloy in very high cycle fatigue regime |
publisher |
MDPI AG |
series |
Metals |
issn |
2075-4701 |
publishDate |
2020-11-01 |
description |
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 × 10<sup>8</sup> 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. |
topic |
titanium alloy turning surface integrity fatigue strength very high cycle fatigue damage mechanism |
url |
https://www.mdpi.com/2075-4701/10/11/1507 |
work_keys_str_mv |
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