| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Steels in Extreme Environments
|
| Presentation Title |
Nanoscale analysis of hydrogen pick up in Fe-based alloys using cryogenic transfer atom probe tomography |
| Author(s) |
Venkata Bhuvaneswari Vukkum, Zehao Li, Vaithiyalingam Shutthanandan, Arun Devaraj |
| On-Site Speaker (Planned) |
Venkata Bhuvaneswari Vukkum |
| Abstract Scope |
The mechanistic understanding of the role of hydrogen in embrittlement and high-temperature stress corrosion cracking of alloys can be improved by leveraging the capabilities of atom probe tomography to map nanoscale hydrogen segregation to defects and interfaces within alloys. However, given the tendency for hydrogen to diffuse out of most alloys even at room temperature, it is necessary to develop a streamlined procedure to charge alloys with hydrogen isotopes and then transfer the samples in vacuum and cryogenic conditions to atom probe tomography. This talk will highlight the state-of-the-art capability available at Pacific Northwest National Laboratory for seamless transfers of alloy samples before and after hydrogen charging, between a plasma-focused ion beam (PFIB—Helios Hydra), atom probe tomography (APT—LEAP 6000XR), and a nitrogen-containing glovebox (N2-GB) at both room and cryogenic temperatures. Using this capability, we quantitatively analyzed the hydrogen pick-up in a model austenitic FeCrNi alloy both with and without deformation-induced defects. This unique capability could be instrumental in analyzing the mechanisms of hydrogen embrittlement and corrosion of a broader class of alloys. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Characterization, Other, |