About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Steels in Extreme Conditions
|
| Presentation Title |
Hydrogen Cation-Induced Martensitic Transformation in Austenitic Stainless Steel During Electrochemical Charging |
| Author(s) |
Heung Nam Han, Junyoung Chae, Guihyung Lee, Hyukjae Lee, Yeonggeun Cho, Dameul Jeong, Young-Kyun Kwon, In-Ho Jung, Sung-Joon Kim |
| On-Site Speaker (Planned) |
Heung Nam Han |
| Abstract Scope |
This study investigates the charged state of hydrogen introduced during electrochemical cathodic charging and its role in inducing martensitic transformation in metastable austenitic stainless steel. By applying an external magnetic field during charging, a Lorentz force was generated, enabling selective control over the distribution of hydrogen species. Hardness profiling and EBSD analysis revealed a directional gradient of martensite and hardness aligned with the Lorentz force, indicating that the diffusing hydrogen exists predominantly in the cationic (H⁺) state. Finite element modeling of hydrogen transport and density functional theory calculations further demonstrated that hydrogen cations induce substantial internal stress. This internal stress is shown to exceed the critical activation energy required for mechanically induced martensitic transformation when the H⁺ fraction surpasses 53%. These findings highlight a distinct electro-mechanical coupling mechanism for hydrogen-driven transformations in metallic materials and clarify the charged nature of hydrogen during electrochemical interactions. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Phase Transformations, Computational Materials Science & Engineering, Other |