| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Steels in Extreme Environments
|
| Presentation Title |
Imaging the Nanoscale Hydrogen Distribution in a Creep Ruptured Austenitic Stainless Steel (347H) Using Atom Probe Tomography |
| Author(s) |
Jonathan Poplawsky, Tanzilur Rahman, Qing-Qiang Ren, Dongwon Shin, Yajie Zhao, Geeta Kumari, Yukinori Yamamoto |
| On-Site Speaker (Planned) |
Jonathan Poplawsky |
| Abstract Scope |
Understanding hydrogen trapping due to nano-structural features, such as grain boundaries, precipitates, dislocations, etc., is important for improving the hydrogen embrittlement problem in structural materials. A custom D-charging and custom cryogenic-transfer system was used to detect the nanoscale hydrogen distribution (as D) in cold rolled, cold rolled and annealed, and creep ruptured 347H austenitic stainless-steel specimens subject to a 700ºC hydrogen environment using atom probe tomography (APT). The results reveal the quantitative hydrogen content in the 347H matrix, precipitates (M23C6, NbC, and sigma), dislocations, and grain boundaries. The results also reveal segregation and/or the lack of segregation to precipitate interfaces. Links between density functional theory, dilatometry, thermal desorption spectroscopy, and APT results, and how these results can be used to understand/improve hydrogen embrittlement will be discussed. APT was conducted at ORNL’s CNMS, which is a U.S. DOE Office of Science user facility. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Characterization, Sustainability, Mechanical Properties |