PSI - Issue 75

KADIRI Mounir et al. / Procedia Structural Integrity 75 (2025) 633–641 KADIRI Mounir/ Structural Integrity Procedia (2025)

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Figure 8 : comparison of self-heating curves between base material, charged coated material and uncharged coated material

4. Conclusion In conclusion, the analysis of the self-heating curves has highlighted the significant impact of hydrogen on the thermomechanical behavior of grade 12.9 martensitic steel, which is particularly sensitive in a marine environment. Although the coating exhibits substantial energy dissipation, hydrogen charging alters the energy-dissipation mechanism which confirms its influence on the self-heating phenomenon. These results demonstrate the applicability of the self-heating method for evaluating the effect of hydrogen on fatigue properties of HSS steel. Further work will aim to separate and quantify the individual impacts of hydrogen and of the coating on dissipated energy by including a configuration in which the material is hydrogen-charged without coating. Finally, the fatigue properties of the material, with and without hydrogen, will be determined from self-heating curves using the two scales probabilistic model. 5. References Amini, Behnaz, Younes Demmouche, Mahmoud Barati, Guillaume Helbert, Shabnam Arbab Chirani, et Sylvain Calloch. 2020. « Self-Heating of Metastable 304L Austenitic Stainless Steel under Cyclic Loading: Influence of Initial Martensite Volume Fraction, Testing Temperature and Pre-Strain ». Mechanics of Materials 151 (décembre):103596. https://doi.org/10.1016/j.mechmat.2020.103596. Doudard, Cédric. 2004. « Détermination rapide des propriétés en fatigue à grand nombre de cycles à partir d’essais d’échauffement ». PhD Thesis. http://www.theses.fr/2004DENS0036. Mostofizadeh, Parham, Mahmoud Kadkhodaei, Shabnam Arbab Chirani, Luc Saint-Sulpice, Maha Rokbani, Tarak Bouraoui, et Sylvain Calloch. 2019. « Fatigue Analysis of Shape Memory Alloys by Self-Heating Method ». International Journal of Mechanical Sciences 156 (juin):329‑41. https://doi.org/10.1016/j.ijmecsci.2019.04.012. Munier, Rémi. 2012. « Etude de la fatigue des aciers laminés à partir de l’auto -échauffement sous sollicitation cyclique: essais, observations, modélisation et influence d’une pré -déformation plastique ». Oudriss, Abdelali. 2025. « L’hydrogène dans les matériaux métalliques ». Aussois. Skipper, C, G Leisk, A Saigal, et D Matson. 2008. « Effect of Internal Hydrogen on Fatigue Strength of Type 316 Stainless Steel ».