| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Steels in Extreme Environments
|
| Presentation Title |
Hydrogen segregation to dislocations in austenitic stainless steels |
| Author(s) |
Fernando Daniel Daniel Leon Cazares, Xiaowang Zhou, Coleman Alleman, Chris San Marchi |
| On-Site Speaker (Planned) |
Fernando Daniel Daniel Leon Cazares |
| Abstract Scope |
Hydrogen is known to segregate to the stacking faults and elastic strain fields around dislocations in metals, impacting dislocation mobility and promoting slip localization. While the segregation energies to such crystallographic defects in pure metals can be predicted, the role of alloying on the distributions of defect energetics remain unclear. The current work leverages atomistic simulations and line tension modeling to investigate the statistical distribution of hydrogen around dislocations in austenitic stainless steels, widely used in high-pressure hydrogen storage and delivery systems. The analysis shows that dislocation character and applied stress may have a large effect on Cottrell-atmosphere size, stacking fault width and dislocation mobility. For large concentrations, hydrogen may segregate to the Shockley partials of screw dislocations and increase the constriction and cross-slip energy barriers. The results of this work provide a better understanding of the hydrogen-dislocation interactions in structural alloys, relevant for the mitigation of hydrogen embrittlement. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Iron and Steel, Modeling and Simulation, Other |