PSI - Issue 33

Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2019) 000–000

www.elsevier.com/locate/procedia

ScienceDirect

Procedia Structural Integrity 33 (2021) 765–772

© 2021 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 scientific committee of the IGF ExCo Abstract Mechanical and physical properties of bainitic steel 15Cr2MnMoV used as a material of oil pump rods were studied in three states: as received, after operation in hydrogen sulfide-containing environment, and after hydrogen charging in H 2 S-containing media for 1 week. In addition, the austenitic corrosion-resistant steel 12Cr18Ni10Ti has been studied in two states: as received and after operation for 6 years. No degradation of the standard mechanical properties of the investigated steels after operation was revealed, although a decrease in the fatigue properties of the austenitic steel 12Cr18Ni10Ti was observed. Mechanical properties were most affected by hydrogen charging of bainitic steel, after which a decrease in ductility, fracture energy, and fatigue life is observed. Four stages of fracture development of the investigated steels under tension are distinguished. It is shown that acoustic emission is the most sensitive method for assessing the degree of structural degradation after operation or hydrogen charging. It is established that the magnetic methods of nondestructive testing show the greatest sensitivity at the elastic stage and at the stage of deformation localization before fracture. The Authors. Published by ELSE IER B.V. i an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) r-review Statement: Peer-review under responsibility of the scientific committee of the IGF ExCo Keywords: structural steels, operation, hydrogen charging, acoustic emission, coercive force, eddy current, residual magnetic field, impact toughness, fatigue IGF26 - 26th International Conference on Fracture and Structural Integrity Effects of long-term operation on mechanical and physical characteristics of structural materials M.R. Tyutin a* , L.R. Botvina a , A.V. Ioffe b a A.A. Baikov Institute of Metallurgy and Materials Science, Russian Academy of Sciences,49 Leninsky prospect, Moscow, 119334, Russia b IT-Service Ltd., 52/55 Ulyanovskaya Street / Yarmarochnaya Str., Samara, 443001, Russia

* Corresponding author. Tel.: +7-499-135-9683; fax: +7-499-135-8680. E-mail address: mtyutin@imet.ac.ru

2452-3216 © 2021 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 Statement: Peer-review under responsibility of the scientific committee of the IGF ExCo

2452-3216 © 2021 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 scientific committee of the IGF ExCo 10.1016/j.prostr.2021.10.084