Abstract
The influence of hydrogen on the elevated-temperature fatigue-crack-growth kinetics of Ti-6Al-2Sn-4Zr-2Mo-0.1Si (Ti-6242S) was studied as a function of temperature, using a fracture-mechanics approach. At temperatures above 420 K, the effect of hydrogen on the fatigue-crack-growth rate in Ti-6242S greatly diminishes, but the rate in 530 wppm hydrogen-charged material remains 35% greater than that of the as-received material. Hydrogen diffusion through the continuous beta-phase in Ti-6242S is apparently the rate-controlling process for the internal-hydrogen-enhanced fatigue crack growth. In the high-temperature region (> 670 K), because creep deformation becomes dominant, the effect of internal hydrogen on the fatigue crack growth is significantly reduced and is negligible above 720 K.
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