Abstract
Mechanical properties of many metals are greatly influenced by hydrogen solutes causing a well-known phenomenon of Hydrogen Embrittlement (HE). Hydrogen atoms affect the dislocation core, materials cohesion, and/or vacancies clustering causing the material capacity for plastic deformation to decrease. Such degradation in performance of metals leads to embrittlement resulting of catastrophic failure in structures. In this research, a physically-based constitutive model is developed to study hydrogen embrittlement in steel alloys. The developed model is an extension for Ghoniem-Matthews-Amodeo (GMA) dislocation-based model in order to predict the constitutive relation in the plastic regime for high strength steel alloys while considering hydrogen Effect on plasticity. The proposed physically-based dislocation-density model include the effect of hydrogen solute on dislocation mobility and interaction. The proposed model study the mechanical behavior of high-strength steel of HT-9 tensile test specimen.
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Acknowledgement
This project is funded by the Academy of Scientific Research and Technology (ASRT) under Joint Collaborative Efforts of Egyptians Expatriates & Scientific Organizations towards Tackling R&D Challenges (JESOR), Contract No. 17.
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Abdelmawla, A., Hatem, T.M., Ghoniem, N.M. (2018). Dislocation-Based Finite Element Modelling of Hydrogen Embrittlement in Steel Alloys. In: & Materials Society, T. (eds) TMS 2018 147th Annual Meeting & Exhibition Supplemental Proceedings. TMS 2018. The Minerals, Metals & Materials Series. Springer, Cham. https://doi.org/10.1007/978-3-319-72526-0_20
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DOI: https://doi.org/10.1007/978-3-319-72526-0_20
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