Hydrogen-enhanced fatigue crack growth behaviors in a ferritic Fe-3wt%Si steel studied by fractography and dislocation structure analysis
| Autor: | Antonio Alvaro, Afrooz Barnoush, Di Wan, Vigdis Olden |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Materials science
Scanning electron microscope Energy Engineering and Power Technology Fractography 02 engineering and technology Plasticity Fatigue crack growth 010402 general chemistry 01 natural sciences Composite material Renewable Energy Sustainability and the Environment FCG Paris' law 021001 nanoscience & nanotechnology Condensed Matter Physics Grain size 0104 chemical sciences Fuel Technology SEM Fracture (geology) Dislocation 0210 nano-technology Hydrogen embrittlement ECCI |
| Zdroj: | International journal of hydrogen energy |
| ISSN: | 0360-3199 5030-5042 |
| Popis: | The effect of hydrogen (H) on the fatigue behavior is of significant importance for metallic structures. In this study, the hydrogen-enhanced fatigue crack growth rate (FCGR) tests on in-situ electrochemically H-charged ferritic Fe-3wt%Si steel with coarse grain size were conducted. Results showed strong difference between the H-charged and the non-charged conditions (reference test in laboratory air) and were in good agreement with the results from literature. With H-charging, the fracture morphology changed from transgranular (TG) type to “quasi-cleavage” (“QC”), with a different fraction depending on the loading frequency. With the help of electron channeling contrast imaging (ECCI) inside a scanning electron microscope (SEM), a relatively large area in the failed bulk specimen could be easily observed with high-resolution down to dislocation level. In this work, the dislocation sub-structure immediately under the fracture surfaces were investigated by ECCI to depict the difference in the plasticity evolution during fatigue crack growth (FCG). Based on the analysis, the H-enhanced FCG mechanisms were discussed. |
| Databáze: | OpenAIRE |
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