Effect of hydrogen on fracture toughness properties of a pipeline steel under simulated sour service conditions
| Autor: | Theodore Steriotis, Mustapha Jouiad, Abderrazak Traidia, Elias Chatzidouros, D.I. Pantelis, R.S. Devarapalli |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Steady state
Materials science Bending (metalworking) Hydrogen Renewable Energy Sustainability and the Environment Plane (geometry) 05 social sciences Energy Engineering and Power Technology chemistry.chemical_element 02 engineering and technology Edge (geometry) 021001 nanoscience & nanotechnology Condensed Matter Physics Cracking Fuel Technology Fracture toughness chemistry 0502 economics and business Perpendicular 050207 economics Composite material 0210 nano-technology |
| Zdroj: | International Journal of Hydrogen Energy. 43:5747-5759 |
| ISSN: | 0360-3199 |
| Popis: | The effect of hydrogen on the fracture toughness properties of an API X65 pipeline steel is studied under simulated H2S in-service conditions. The fracture toughness properties are measured in LT and SL directions (perpendicular and parallel to the pipeline wall thickness, respectively), following ASTM E1820. Due to size restrictions of standard single edge notch bending (SEB) specimens at the direction parallel to the thickness of the pipeline wall, an experimental protocol (see the patent) was developed to carry out the fracture toughness tests, while complying with ASTM standard 1820. This approach is especially useful in situations where hydrogen induced cracking (HIC) and in a broader sense, stepwise cracking takes place, since these cracks initiate and grow primarily in planes parallel to the pipeline rolling plane. Such values of fracture toughness are often different from those commonly measured in planes perpendicular to the rolling plane. Hydrogen might not have the same effect on fracture toughness properties as measured in different directions, due to microstructural features which are inherent from steel manufacturing process. The steady state H2S in-service conditions are simulated by electrolytically charging the specimen, for 48 h and then testing (ex-situ) the specimen for evaluating the fracture toughness properties. The steady state H2S environment charging was obtained by measuring the hydrogen concentration in the bulk of the specimen through thermal desorption spectroscopy (TDS) at three levels of hydrogen concentration. It was observed that the KQ was moderately decreased with increasing hydrogen concentration in the bulk of the steel, while CTOD0 showed a significant reduction with increasing hydrogen concentration. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect