About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
High Performance Steels
|
| Presentation Title |
Integration of Microstructure Characterization and GB Cleavage Simulation in Hydrogen Embrittlement of Martensite Steel |
| Author(s) |
Kazuki Matsubara, Kaneharu Okuda |
| On-Site Speaker (Planned) |
Kazuki Matsubara |
| Abstract Scope |
Utilization of hydrogen gas is an important issue for realization of low carbon society. However, it is well known that the presence of hydrogen degrades mechanical properties, especially in high strength steels. The initiation mechanism of H-induced intergranular fracture was elucidated by combining experimental and computational methods to obtain a scientific basis for proving the safety.
Fracture toughness tests of martensite steels were conducted in high pressure hydrogen gas. Isolated microcracks with ligaments were formed in initiation stage. Correspondence between crack path and microstructure was analyzed using electron back scattered diffraction analysis.
A simulation technique to reflect grain boundary characterization according to martensite hierarchical crystallography was developed to compare the hydrogen embrittlement risk of various grain boundaries. Molecular dynamics calculations using neural network interatomic potentials revealed that prior austenite grain boundaries capture more hydrogen, and the grain boundary strength is lower than that of the intragranular interface. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Iron and Steel, Modeling and Simulation, Characterization |