PSI - Issue 36

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

www.elsevier.com/locate/procedia www.elsevier.com/locate/procedia

Procedia Structural Integrity 36 (2022) 306–312

© 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 The existing network of both transit and distribution gas pipelines has recently been proposed to be used for the transportation of hydrogen as an energy fuel in the multifaceted structure of the development of renewable energy sources. From this point of view, the paper considers the sensitivity of a long-term operated steel of distribution gas pipeline to hydrogen assisted cracking as a result of preliminary electrolytic hydrogenation of flat tensile specimens, followed by determination of strength and plasticity characteristics. The research methodology has two features: (i) the specimens are cut out from the pipe in the transverse direction to the pipe axis; in this case the fracture plane is parallel to the rolling direction of metal sheet from which the pipes were made; (ii) specimen thickness is 1.2 mm maximally providing through hydrogenation. The study additionally includes determination of hydrogen concentration in the steel, and fractographic analysis. It is shown that the low-carbon steel of the 52-year-old gas pipeline with high residual hydrogen content especially sensitive to hydrogen assisted cracking, indicated by signs of low-energy fracture at the micro scale. © 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: natural gas distribution network; hydrogen transportation; pipeline steel; hydrogen embrittlement; dissipated microdamaging 1st Virtual International Conference “In service Damage of Materials: Diagnostics and Prediction” Susceptibility of carbon pipeline steels operated in natural gas distribution network to hydrogen-induced cracking Hryhoriy Nykyforchyn a, *, Leonid Unigovskyi b , Olha Zvirko a , Myroslava Hredil a , Halyna Krechkovska a , Oleksandra Student a , Oleksandr Tsyrulnyk a a Karpenko Physico-Mechanical Institute of the National Academy of Sciences of Ukraine, 5, Naukova St., 79060 Lviv, Ukraine b Naftogazbudinformatyka Ltd., 5-B, Kudriavskyi Descent, office 208, 04053 Kyiv, Ukraine Abstract The existing network of both transit and distribution gas pipelines has recently been proposed to be used for the transportation of hydrogen as an energy fuel in the multifaceted structure of th development of renewabl energy ources. From this po nt view, the paper considers the sensitivity of a long- erm operated ste l of distribution gas pip line to hydrog n assisted cracki g as a result of pr limi ary electrolytic hydr genation of flat t nsile p cimen , followed by determination f strength and plasticity characteristics. The resear h me hodology has two features: (i) the specimens are cut out from the pipe in the transverse direction to the pipe axis; in thi case th fracture plane is par llel to the rolling dir ction of metal sheet from which the pipes were made; (ii) specimen thicknes is 1.2 mm maximally providing through hydrogenation. The study additi nally includ s determination of hydrogen concentration in the steel, and fractographic analysis. It is shown that the low-carb steel of the 52-year-old gas pipelin with high residual hydrog n content especially se sitive to hydrogen assisted cracking, indicat d by signs of low-energy fractur at t e micro cale. © 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: natural gas distribution network; hydrogen transportation; pipeline steel; hydrogen embrittlement; dissipated microdamaging 1st Virtual International Conference “In service Damage of Materials: Diagnostics and Prediction” Susceptibility of carbon pipeline steels operated in natural gas distribution network to hydrogen-induced cracking Hryhoriy Nykyforchyn a, *, Leonid Unigovskyi b , Olha Zvirko a , Myroslava Hredil a , Halyna Krechkovska a , Oleksandra Student a , Oleksandr Tsyrulnyk a a Karpenko Physico-Mechanical Institute of the National Academy of Sciences of Ukraine, 5, Naukova St., 79060 Lviv, Ukraine b Naftogazbudinformatyka Ltd., 5-B, Kudriavskyi Descent, office 208, 04053 Kyiv, Ukraine

* Corresponding author. Tel.: +380 322 294213; fax: +380 322 649427. E-mail address: hnykyforchyn@gmail.com * Corresponding author. Tel.: +380 322 294213; fax: +380 322 649427. E-mail address: hnykyforchyn@gmail.com

2452-3216 © 202 2 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 © 202 2 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.2022.01.039