About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Environmentally Assisted Cracking: Theory and Practice
|
| Presentation Title |
Hydrogen Embrittlement Behavior of Alloy 725 With Different Hydrogen Precharging Methods |
| Author(s) |
Mengying Liu, Lai Jiang, Patrick Schools, Aiden Gray, Michael Demkowicz |
| On-Site Speaker (Planned) |
Mengying Liu |
| Abstract Scope |
Structural materials like alloy 725 can be embrittled when exposed to H-rich environment. To understand the effects of different hydrogen source to embrittlement behavior, we compare the interior microstructures of the hydrogen embrittled (HE) alloy 725 with gaseous and electrochemical precharged hydrogen via 3D X-ray computed tomography (CT). Apart from the primary crack which lead to the major fracture, gaseous precharging leads to a predominance of secondary cracks in the sample interior with higher sphericity comparing with elongated surface secondary HE cracks with electrochemical precharging. Despite having the same local H content, the density and volume fractions of cracks are different. Understanding the distribution and connection among those is crucial for imparting the HE mechanisms and help with better lifetime prediction of materials for H transportation and cathodic protection. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Mechanical Properties, Environmental Effects, |