Abstract
To better understand the correlation between fatigue failure and prior β-grain size, in β-annealed microstructures, the morphology of fatigue fracture facets which contain more than one α platelet colony in Ti-11 and IMI-685 titanium alloys was investigated. It was found that most α/β traces on the basal fracture facets, intersect at angles approximately 50, 60 and 70 deg. These angles can be predicted by the Burgers relation that allows α platelet colonies to have a common basal plane within the same prior β-grain. This commonality promotes shear related faceted fracture through more than one colony and increases the effective colony size. The increased effective colony size can cause more fatigue crack branching and, therefore, reduces fatigue crack growth rates in β-annealed microstructures.
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Eylon, D. Faceted fracture in beta annealed titanium alloys. Metall Trans A 10, 311–317 (1979). https://doi.org/10.1007/BF02658339
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DOI: https://doi.org/10.1007/BF02658339