Modeling Hydrogen-Assisted Fatigue Crack Growth in Low-Carbon Steel
Author Information
Author(s): Osamu Takakuwa, Yuhei Ogawa
Primary Institution: Kyushu University
Hypothesis
The study aims to model the hydrogen-assisted fatigue crack growth mechanism based on the obstruction of dislocations within the crack tip zone.
Conclusion
The study found that hydrogen significantly decreases dislocation mobility, leading to accelerated fatigue crack growth in low-carbon steel.
Supporting Evidence
- Hydrogen significantly decreases dislocation mobility, leading to accelerated fatigue crack growth.
- At higher temperatures, the extent of hydrogen-assisted fatigue crack growth decreases.
- Lowering the load frequency allows hydrogen to diffuse more deeply, affecting dislocation mobility.
Takeaway
When hydrogen gets trapped in steel, it makes it harder for the steel to bend and move, causing cracks to grow faster.
Methodology
The study used compact-tension specimens of low-carbon steel and conducted fatigue crack growth tests in hydrogen gas at various temperatures and load frequencies.
Limitations
The raw/processed data required to reproduce these findings cannot be shared at this time, as the data also forms part of an ongoing study.
Digital Object Identifier (DOI)
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