About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Steels in Extreme Conditions
|
| Presentation Title |
Hydrogen Embrittlement of Pipeline Steels |
| Author(s) |
Wendy Gu, Madison Morrison, Adam Barsotti |
| On-Site Speaker (Planned) |
Wendy Gu |
| Abstract Scope |
Hydrogen embrittlement of steel pipelines is a concern for hydrogen transport and distribution. Hydrogen that enters an alloy becomes distributed between the crystal lattice and hydrogen traps such as grain boundaries. Under mechanical loading, the presence of the hydrogen can lead to reduced strength, ductility, fracture toughness and/or fatigue life, but the mechanisms behind this are incompletely understood. I will first discuss the in-situ electrochemical hydrogen charging, mechanical testing and imaging of iron and nickel. Synchrotron transmission X-ray microscopy is used to image microvoid formation, secondary cracking and the propagation of the primary crack. In-situ Kelvin probe force microscopy is used to image the hydrogen distribution under strain. We find that hydrogen accumulates at high angle grain boundaries in nickel. Then, I will connect these findings to hydrogen embrittlement in x65 pipeline steel. I will discuss hydrogen segregation at pearlitic phases, and relate this to mechanical behavior and failure mechanisms. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Environmental Effects, Mechanical Properties, Characterization |