Study on Very high-cycle Bending Vibration Fatigue Performance of TC17
Titanium Alloys under Corrosion and Laser Shock Processing
Abstract
In this paper, the very high-cycle fatigue performance of TC17 titanium
alloys under corrosion environment and laser shock was studied by the
load of first-order bending vibration. The results show that the very
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 very high cycle fatigue properties of TC17
titanium alloys. The very high cycle fatigue performance of TC17 under
corrosion environment did not decrease significantly, but the very 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”.