Hydrogen Diffusion in TRIP Steel
Author Information
Author(s): Hempel Christian, Mandel Marcel, Quitzke Caroline, Wendler Marco, Kreschel Thilo, Volkova Olena, Krüger Lutz
Primary Institution: Technische Universität Bergakademie Freiberg
Hypothesis
The study investigates how pre-deformation affects hydrogen diffusion and embrittlement in TRIP steel.
Conclusion
The susceptibility to hydrogen embrittlement increases with pre-strain due to higher diffusion coefficients in martensite and increased dislocation density.
Supporting Evidence
- Hydrogen causes embrittlement in TRIP steel for all investigated states.
- Embrittlement increases with increasing pre-deformation.
- Fractographic analyses correlate well with calculated hydrogen distributions.
Takeaway
When steel is stretched before being exposed to hydrogen, it becomes more likely to break because the hydrogen can move through it more easily.
Methodology
The study used electrochemical hydrogen charging and tensile tests on cold-rolled TRIP steel samples to analyze hydrogen diffusion and embrittlement.
Limitations
The study does not account for inhomogeneities in hydrogen distribution and varying degrees of deformation in real applications.
Digital Object Identifier (DOI)
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