| About this Abstract |
| Meeting |
2023 TMS Annual Meeting & Exhibition
|
| Symposium
|
Fatigue in Materials: Fundamentals, Multiscale Characterizations and Computational Modeling
|
| Presentation Title |
Hydrogen Impact on Cyclic Behavior of Titanium Alloys Questioned in Term of Dislocation Pattern and Internal Stresses: Some Consequences on Damage |
| Author(s) |
Larissa Moreira, Abdelali Oudriss, Guillaume Lotte, Stéphane Cohendoz, Simon Frappart, Aude Mathis, Thierry Millot, Jamaa Bouhattate, Xavier Feaugas |
| On-Site Speaker (Planned) |
Xavier Feaugas |
| Abstract Scope |
The fundamental mechanisms which impact cyclic behavior of T40 under hydrogen are studied. During fatigue testing of pre-charging samples (between 15 to 1000 wppm.), the fatigue hysteresis loops are recorded to track the cyclic behavior and to evaluate the internal stresses evolution. The fracture surface morphology was first examined using scanning electron microscopy (striation spacing) and in a second time samples near the fracture surface were extracted using Focused-Ion Beam machining from regions containing striation to question the deformation mode. Three states of hydrogen have been identified which correspond to hydrogen in solution, gamma hydride and delta hydride. For each one, the evolution of the number of cycles to fracture, the crack initiation and propagation and the internal stress evolution are different. These results are discussed in relation with the hydrogen embrittlement mechanisms in terms of hydrogen / plasticity interactions. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Mechanical Properties, Environmental Effects, Titanium |