| About this Abstract |
| Meeting |
MS&T24: Materials Science & Technology
|
| Symposium
|
Advances in Materials and Systems for a Hydrogen Economy
|
| Presentation Title |
Effects of Oxygen Impurities on Long-Term Gaseous Hydrogen Embrittlement of Structural Steels |
| Author(s) |
Robert Wheeler, Chris San Marchi, Joseph Ronevich, Norman Bartelt, Farid El Gabaly, Milan Agnani, Fernando Leon-Cazares |
| On-Site Speaker (Planned) |
Robert Wheeler |
| Abstract Scope |
The growth of hydrogen energy technologies has sparked interest in understanding the influence of high-pressure gaseous hydrogen on material properties of structural metals. Exposure to gaseous hydrogen can cause hydrogen embrittlement, negatively affecting the fracture resistance, fatigue life, and can induce subcritical crack growth. However, short-term laboratory studies have shown that relatively low amounts of oxygen impurities (e.g., 100PPM) can mitigate the effects of hydrogen on fatigue and fracture. This study investigates the effects of oxygen impurities on gaseous hydrogen environment-assisted cracking on longer time scales (100s of hours). In this work, fracture testing of several pipeline and low-alloy steels demonstrates that adding 100 and 1000PPM oxygen to high-pressure hydrogen can delay the subcritical crack initiation but does not prevent crack propagation or affect crack growth rates or arrest thresholds. Consequently, oxygen impurities should not be relied upon for long-term mitigation of gaseous hydrogen embrittlement. |