Abstract
The influence of hydrogen content on fatigue response was examined for a near-α titanium alloy, Ti-6Al-2Sn-4Zr-2Mo-0.1Si, in bimodal microstructural condition with ~70 vol% primary α. The hydrogen content was varied in the range 7–127 ppm (by weight). The fracture mechanism at crack-initiation sites changed from ductile tearing with localized plasticity in low (<50 ppm) hydrogen alloys to a more brittle fracture with facets in high (≥100 ppm) hydrogen alloys. The variation in fatigue life (by a factor of ≤1.8) was partially associated with the differences in hydrogen level and partially with the statistical scatter in life.
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