About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Steels in Extreme Conditions
|
| Presentation Title |
Understanding Hydrogen Embrittlement Mechanisms in Q&P Steels |
| Author(s) |
Can Okuyucu, Narayan Pottore, Hong Zhu, Cemal Cem Tasan |
| On-Site Speaker (Planned) |
Can Okuyucu |
| Abstract Scope |
Hydrogen embrittlement (HE) critically limits the application of AHSS in the automobile industry, yet the underlying fracture mechanisms remain complex and often scale-dependent. In this study, we investigate the role of microstructural features by combining postmortem and in-situ characterization techniques across length scales. Electrochemical hydrogen charging and mechanical testing demonstrate preferential crack growth along critical interfaces. APT and EDS reveal elemental segregation and the presence of secondary phases potentially influencing hydrogen trapping. Synchrotron-based HEXRD and in-situ EBSD provide complementary insights into phase evolution and local strain redistribution. Collectively, the results suggest that multiple established hydrogen-assisted damage mechanisms may operate concurrently, particularly in regions containing filmy austenite and secondary particles, contributing to fracture through a combination of processes not fully captured by classical decohesion or void growth models. This multiscale mechanistic perspective offers new insight into microstructural features governing HE susceptibility and may guide alloy and process design for improved resistance. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Iron and Steel, Characterization, Other |