PSI - Issue 36

Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2021) 000 – 000

www.elsevier.com/locate/procedia

ScienceDirect

Procedia Structural Integrity 36 (2022) 298–305

© 2022 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the conference Guest Editors Abstract We have conducted the special tests of standard tensile specimens that were preliminary hydrogen charged to the low concentration about 0.23 wppm at which the mechanism of hydrogen influence changes, and then fully hydrogen discharged before testing. It has been found that increasing the number of cycles of charging-discharging leads to decreasing the value of yield stress, due to the appearance of the microstructural defects, which facilitate the deforming ability of steel. Thus, even a short-term presence of the diffusible hydrogen in the ferrite-pearlite pipeline steel leads to irreversible changes in the m aterial’s microstructure increasing its defectiveness and, consequently, affects on the macroscopic mechanical behaviour of steel. © 2022 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the conference Guest Editors Keywords: Type your keywords here, separated by semicolons ; 1. Introduction Nowadays, it can be stated that hydrogen demonstrates various effects on the mechanical properties of engineering metallic materials: Somerday et al. (2009). Although, there is no complete understanding of these effects and the concepts and approaches to the solution of the most important problems of hydrogen materials science are quite contradictory as it was shown by Barrera et al. (2018). Furthermore, prevail numbers of investigations in this field have a substantial disadvantage: the true level of hydrogen concentration in the metal was unknown and, hence, the degree of its hydrogenation is taken into account indirectly. However, the volume concentrations of hydrogen in u This is an open access article under the CC BY-NC-ND l 1st Virtual International Conference “In service Damage of Materials: Diagnostics and Prediction” Specific mechanism of hydrogen influence on deformability and fracture of low-alloyed pipeline steel Ihor Dmytrakh a *, Andriy Syrotyuk a , Rostyslav Leshchak a a Karpenko Physico-Mechanical Institute of National Academy of Sciences of Ukraine, 5 Naukova Street, Lviv, 79060, Ukraine r t a a

* Corresponding author. Tel: +38 032 2631400; fax: +38 032 2649427. E-mail address: dmtr@ipm.lviv.ua; ihor.dmytrakh@gmail.com

2452-3216 © 2022 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the conference Guest Editors

2452-3216 © 2022 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the conference Guest Editors 10.1016/j.prostr.2022.01.038