PSI - Issue 54

L.B. Peral et al. / Procedia Structural Integrity 54 (2024) 212–217

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Author name / Structural Integrity Procedia 00 (2019) 000 – 000

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(a) (c) Fig. 8. Fracture micromechanisms. (a) In air (uncharged). (b) At 70 bar and (c) At 140 bar of hydrogen pressure (b)

4. Conclusions In-situ tensile tests in high-pressure hydrogen gas were carried out in smooth and notched samples. The main conclusions are the following. In smooth samples, properties related with ductility, such as elongation and reduction of area, were especially affected. Hydrogen-assisted cracks were observed throughout the fracture surface. Despite of this fact, the increase in hydrogen pressure from 70 to 140 bar seems to be negligible. Regarding the notched samples, hydrogen embrittlement was notably improved with increasing hydrogen pressure. Hydrogen-enhanced decohesion micromechanisms were pronounced at 140 bar. Acknowledgements The authors would like to thank the Spanish Government for the financial support received to perform the research projects PID2021-124768OB-C21 and TED2021-130413B-I00 – HyDuplex3D. This work was also supported by the Regional Government of Castilla y León (Junta de Castilla y León) and by the Ministry of Science and Innovation MICIN and the European Union Next Generation EU/PRTR (MR4W.P2 and MR5W.P3). References [1] Arniella V, Álvarez G, Belzunce J, Rodríguez C. Hydrogen embrittlement of 2205 duplex stainless steel in in-situ tensile tests. Theoretical and Applied Fracture Mechanics 2023;124. https://doi.org/10.1016/j.tafmec.2023.103794. [2] Claeys L, De Graeve I, Depover T, Verbeken K. Hydrogen-assisted cracking in 2205 duplex stainless steel: Initiation, propagation and interaction with deformation-induced martensite. Materials Science and Engineering: A 2020;797. https://doi.org/10.1016/j.msea.2020.140079. [3] Wu W, Liu S, Li W, Li J. Identification of microstructure factors affecting hydrogen embrittlement of a 2205 duplex stainless steel. Corros Sci 2022;208. https://doi.org/10.1016/j.corsci.2022.110643.