| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Steels in Extreme Environments
|
| Presentation Title |
3D characterization and cohesive zone model analysis on hydrogen-related intergranular fracture in martensitic steel |
| Author(s) |
Akinobu Shibata, Ivan Gutierrez-Urrutia, Akiko Nakamura, Taku Moronaga, Kazuho Okada, Toru Hara, Yazid Madi, Jacques Besson |
| On-Site Speaker (Planned) |
Akinobu Shibata |
| Abstract Scope |
Hydrogen embrittlement is a phenomenon where materials become brittle due to the presence of hydrogen. As the susceptibility to hydrogen embrittlement increases with increasing strength level of the material, designing materials to resist hydrogen embrittlement is crucial for the practical application of advanced high-strength steels. This study investigated the hydrogen-related intergranular crack propagation behavior in high-strength low-carbon martensitic steel (8Ni-0.1C steel) using 3D analysis with focused ion beam-scanning electron microscopy serial sectioning. We found that intergranular cracks were locally arrested at low-angle prior austenite grain boundary segments with sub-micrometer size. Additionally, plastic deformation sufficient to form an ultrafine-grained structure sometimes occurred locally at the tip of the arrested intergranular crack. We utilized finite element simulation with a cohesive zone model to reproduce the experimentally obtained load-displacement curves. The results suggest that the arrestability of low-angle boundary segments significantly influences the macroscopic mechanical response to hydrogen-related fractures. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Iron and Steel, Mechanical Properties, |