About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Environmentally Assisted Cracking: Theory and Practice
|
| Presentation Title |
Chemomechanics of High Temperature Hydrogen Attack |
| Author(s) |
Kshitij Vijayvargia, Thi Nguyen, Mohsen Dadfarnia, Aleksandar Staykov, Masanobu Kubota, Petros Sofronis, May L. Martin, John A. Pugh |
| On-Site Speaker (Planned) |
Kshitij Vijayvargia |
| Abstract Scope |
High temperature hydrogen attack (HTHA) is a form of degradation of carbon steels exposed to high temperature hydrogen whereby internal hydrogen reacting with carbides forms methane gas bubbles with an associated loss in strength and toughness due to decarburization. Grain boundary gas bubbles can grow and coalesce leading to microcrack formation and frequently to premature fracture. Currently, HTHA modeling commonly relies on Grabke and Martin's methane-generation kinetics, developed from iron carburization experiments at temperatures higher than typical industrial HTHA conditions. To overcome this limitation, this research introduces a coupled chemical kinetics and micromechanics model capable of describing simultaneous methane gas formation, decarburization, and bubble growth over a temperature range relevant to HTHA. The model provides insight into interactions between hydrogen transport, chemical reactions, methane bubble growth, and decarburization, offering a robust approach to evaluating damage progression across length and time scales relevant to industrial hydrogen attack scenarios. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Environmental Effects, Mechanical Properties, Modeling and Simulation |