About this Abstract |
Meeting |
2020 TMS Annual Meeting & Exhibition
|
Symposium
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Fatigue in Materials: Fundamentals, Multiscale Characterizations and Computational Modeling
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Presentation Title |
Macrozones and Dwell Fatigue Failure on a Near-α Titanium Alloy |
Author(s) |
Beatriz Fernandez-Silva, Bradley Wynne, Martin Jackson, Matthew Thomas, Katharine Fox |
On-Site Speaker (Planned) |
Beatriz Fernandez-Silva |
Abstract Scope |
The susceptibility to cold dwell fatigue of near-α titanium alloys has been a matter of investigation in the aerospace industry for more than 40 years. Alloys such as Ti834 have a reduction in fatigue life when the material is exposed to high stress during the loading cycle. The failure source is observed as subsurface cracks through primary alpha grains leading to quasi-cleavage facets, which are nearly normal to the loading direction and unfavourably orientated for slip to occur. The presence of strong textured regions called macrozones has been linked with dwell fatigue failure where the main texture component comes from these grains. However, in bimodal microstructures the transformed beta may contribute to the final macrozone size and density. In this work, the nature of the underlying macrozones, the contribution of the morphologies of the bimodal microstructure and their relation to the faceted regions on LCF specimen fracture surfaces is examined. |
Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |