Abstract
In order to investigate the effect of gaseous hydrogen on cyclic slip behavior around an early stage (stage Ifatigue crack tip, fatigue crack growth (FCGtests using a single-crystalline Fe-3.2wt.%Si alloy are conducted respectively in a hydrogen atmosphere and in a helium atmosphere. The cross-sectional observations of the crack tips by both electron backscatter diffraction (EBSDmethod and transmission electron microscopy (TEMsuccessfully reveal the following points. In helium atmosphere, FCG is preceded by formation of cell structures and crack propagates along cell boundaries. In hydrogen atmosphere, on the other hand, no cells are seen, and crack growth process is similar to that observed in a stage II type FCG. Crack extension resistance in hydrogen is postulated to be lower than that in helium, indicating that the mode of FCG in hydrogen is more critical than that in helium.
| Original language | English |
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| Publication status | Published - Dec 1 2010 |
| Externally published | Yes |
| Event | 18th European Conference on Fracture: Fracture of Materials and Structures from Micro to Macro Scale, ECF 2010 - Dresden, Germany Duration: Aug 30 2010 → Sept 3 2010 |
Conference
| Conference | 18th European Conference on Fracture: Fracture of Materials and Structures from Micro to Macro Scale, ECF 2010 |
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| Country/Territory | Germany |
| City | Dresden |
| Period | 8/30/10 → 9/3/10 |
Keywords
- Crack tip
- Dislocation structures
- EBSD
- Hydrogen embrittlement
- Iron-silicon alloy
- Single crystal
- Stage I fatigue crack growth
- TEM
ASJC Scopus subject areas
- Mechanics of Materials