Abstract
The influence of hydrogen on fatigue-crack-growth kinetics of Ti-6A1-2Sn-4Zr-2Mo-0.1Si (Ti-6242S) was studied, using a fracture mechanics approach, as a function of temperature, stress-intensity level, and cyclic load frequency. External gaseous hydrogen at pressures < 400 Pa does not increase the fatigue-crack-growth rate of Ti-6242S. Internal hydrogen at a level of 530 parts per million by weight (wppm), however, increases the fatigue-crack-growth rate significantly, with the effect being more pronounced at intermediate and high stress-intensity levels, low cyclic-load frequencies, and low temperatures. At temperatures above 400 K, internal hydrogen has no significant effect on fatigue-crack-growth rates. The results suggest that enhancement of fatigue-crack growth by internal hydrogen in the Ti-6242S occurs through a stress-assisted hydride-precipitation mechanism.
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