Abstract
Dwell fatigue failure has always been the most concerning threat to titanium alloy components, and the dominant mechanism is still not thoroughly understood. In this work, room temperature stress-controlled dwell fatigue tests were performed on a near α titanium, Ti-6Al-3Nb-2Zr-1Mo alloy with equiaxed microstructure. Quantitative characterization was conducted to reveal the surface morphology and the crystallographic orientation of facets on the fracture. The results shows that faceted primary α grains well aligned with (0001) basal plane. Facets at crack-initiation sites were found with orientation distribution ranging from 20° to 60°, while the facets at crack path shows a more scatter orientation distribution. Based on the results, phenomenological models were proposed to explain the formation of facets from the aspect of slip-assisted cracking, including basal slip band cracking, and mixed-deformation induced cracking, which well elucidated the formation of traditional sharp facet and special step-liked facet morphology.
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