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Study on Ultra high-Cycle Bending Vibration Fatigue Performance of TC17 Titanium Alloys under Corrosion and Laser Shock Processing
  • +4
  • Hui Zhang,
  • Xuan Chen,
  • Quantong Li,
  • Li Cheng,
  • Jingsheng Shen,
  • Wenbin Cui,
  • Changkai Wang
Hui Zhang
Air Force Engineering University
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Xuan Chen
Air Force Engineering University
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Quantong Li
Air Force Engineering University
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Li Cheng
Air Force Engineering University
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Jingsheng Shen
Air Force Engineering University
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Wenbin Cui
Air Force Engineering University
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Changkai Wang
Air Force Engineering University
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Abstract

In this paper, the ultra high-cycle bending vibration fatigue performance of TC17 titanium alloys under corrosion environment and laser shock was studied by using a new loading method. The results show that the ultra high-cycle fatigue performance of TC17 titanium alloys has no fatigue limit in the traditional sense and different surface processing has different effects on the ultra high-cycle fatigue properties of TC17 titanium alloys. The ultra high-cycle fatigue performance of TC17 under corrosion environment did not decrease significantly, but the ultra high-cycle fatigue performance of TC17 strengthened by laser shock treatment could be greatly improved. With the SEM analysis, it was found that the specimen crack initiation showed two modes: surface and sub-surface, which was independent of the internal inclusions and defects. No sign of internal crack initiation was found and the sub-surface crack propagation did not show “fish-eye”.