Abstract
Hydrogen embrittlement susceptibility of a 1.5 GPa class ferrite/martensite dual-phase steel was evaluated using the U-bend test. Hydrogen-induced delayed fracture occurs via the coalescence of surface and sub-surface cracks. While surface cracking is caused by the growth of pre-existing cracks formed during the U-bending, sub-surface cracks are formed by tensile stress that evolved during reloading. Despite the non-monotonic stress gradient across the U-bent cross-section, the crack propagation mechanism for surface and sub-surface cracks is identical.
Graphical Abstract
References
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Acknowledgments
The authors are grateful for the funding received from the project, JPNP14014, commissioned by the New Energy and Industrial Technology Development Organization (NEDO).
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Varanasi, R.S., Koyama, M., Shibayama, Y. et al. Hydrogen-Induced Delayed Fracture in a 1.5 GPa Dual-Phase Steel via Coalescence of Surface and Sub-surface Cracks. Metall Mater Trans A 54, 2989–2997 (2023). https://doi.org/10.1007/s11661-023-07096-8
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DOI: https://doi.org/10.1007/s11661-023-07096-8