About this Abstract |
Meeting |
2022 TMS Annual Meeting & Exhibition
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Symposium
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Fatigue in Materials: Fundamentals, Multiscale Characterizations and Computational Modeling
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Presentation Title |
Damage Manifestation in Hydrogen-assisted Fatigue |
Author(s) |
Matthew Connolly, May L Martin, Robert Amaro, Peter Bradley, Damian Lauria, Jun-Sang Park, Zack Buck, Andrew Slifka |
On-Site Speaker (Planned) |
Matthew Connolly |
Abstract Scope |
To make reliable predictions of a structure’s lifetime, it is necessary to know the amount of damage the material undergoes during a typical service cycle and the cumulative damage the material can withstand prior to failure. The amount of damage is most often described by a single parameter, e.g. the stress-intensity factor in fatigue crack growth or strain-amplitude in strain-life testing. However, not all damage processes are equal. For equivalent plastic strain levels, damage may occur by void nucleation and coalescence, dislocation generation and movement, or grain separation and rotation. Similarly, hydrogen can affect whether, and how, mechanical loading translates to damage. Here we present simultaneous High Energy X-ray Diffraction (HEXRD) and Small-Angle X-ray Scattering (SAXS) measurements during fatiguing of steel in air and in hydrogen which demonstrate the differences in damage manifestation during hydrogen-assisted and unassisted fatigue. |
Proceedings Inclusion? |
Planned: |
Keywords |
Iron and Steel, Environmental Effects, Other |