PSI - Issue 33

Hryhoriy Nykyforchyn et al. / Procedia Structural Integrity 33 (2021) 646–651 Hryhoriy Nykyforchyn, Leonid Unigovskyi, Olha Zvirko et al. / Structural Integrity Procedia 00 (2019) 000–000

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Operational degradation of pipe steels decreases significantly characteristics of brittle fracture resistance including hydrogen induced cracking. In-bulk dissipated damaging is the main reason of a sensitivity of degraded steel to hydrogen embrittlement. The main peculiarities of experimental studies of influence of hydrogen or hydrogen-natural gas mixture on pipe steel durability consisted in the following: comparison of mechanical behaviour of as-received and exploited steels, as well as steel properties from different zones of weld joints and different parts of elbows; evaluation of characteristics of brittle fracture resistance and hydrogen induced cracking; exposing of pre-loaded specimens in hydrogen or hydrogen-natural gas mixture with the next prevention of hydrogen desorption before in-laboratory tests; determination of hydrogen concentration; microfractographic analysis. References Capelle, J., Dmytrakh, I., Azari, Z., Pluvinage, G., 2013. 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Tsyrul'nyk, O.T., Voloshyn, V.A., Petryna, D.Yu., Hredil, M.I., Zvirko, O.I., 2011. Degradation of properties of the metal of welded joints in operating gas mains. Materials Science 46(5), 628–632. Tsyrulnyk, O.T., Kret, N.V., Voloshyn, V.A., Zvirko, O.I., 2018. A procedure of laboratory degradation of structural steels. Materials Science 53(5), 674–683. Xue, L., Keim, V., Paredes, M., Nonn, A., Wierzbicki T., 2021. Anisotropic effects on crack propagation in pressurized line pipes under running ductile fracture scenarios. Engineering Fracture Mechanics 249, 107748. Zvirko, O.I., Kret, N.V., Tsyrulnyk, O.T., Vengrynyuk, T.P., 2018. Influence of textures of pipeline steels after operation on their brittle fracture resistance. Materials Science 54(3), 400–405. Zvirko, O., Gabetta, G., Tsyrulnyk, O., Kret, N., 2019. Assessment of in-service degradation of gas pipeline steel taking into account susceptibility to stress corrosion cracking. Procedia Structural Integrity 16, 121–125.