PSI - Issue 40

Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2022) 000 – 000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2022) 000 – 000

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Procedia Structural Integrity 40 (2022) 166–170

© 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 scientific committee of the15th International Conference on Mechanics, Resources and Diagnostics of Materials and Structures. Abstract This paper deals with optical and ultrasonic investigations in the base metal and heat affected zone of welded specimens of ASTM 1020 steel under low-cycle fatigue. Development of persistent slip bands on the surface was observed using optical microscope. Differences in development of slip bands in the base metal and heat affected zone were analyzed. Acoustic birefringence of shear waves was measured by the ultrasonic pulse echo method. For the base metal, acoustic birefringence was found to decrease monotonously. For heat affected zone, acoustic birefringence was found to change non-monotonously up to cycle ratio of 0.3 and decrease monotonously after cycle ratio of 0.3. Based on the linear dependence of acoustic birefringence on the relative number of loading cycles, an ultrasonic technique is proposed for assessing fatigue damage. © 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 scientific committee of the15th International Conference on Mechanics, Resource and Diagnostics of Materials and Structures. Keywords: low-carbon structural steel; acoustic birefringence; heat affected zone; low-cycle fatigue 15th International Conference on Mechanics, Resource and Diagnostics of Materials and Stru tures Metallographic and ultrasonic studies of fatigue failure of ASTM 1020 steel in the base metal and heat affected zone A.V. Gonchar a , O.A. Sergeeva b , K.V. Kurashkin a * a Mechanical Engineering Research Institute of RAS - branch of the "Federal Research Center The Institute of Applied Physics of the RAS", 85, Belinskogo str., Niz ny Novgorod, 603024, Russia Federation b Volga-Spetsgidroenergomontazh – Kamspetsenergo, 8, Shlyuzovaya str Naberezhny Chel y,423800, Russian Federation Abstract This paper deals with optical and ultrasonic investigations in the base metal and heat affected zone of welded specimens of ASTM 1020 steel under low-cycle fatigue. De lopment of persistent slip b s on the surface was obs rv using optical microscope. Differe c s in deve opment of slip bands in the ba metal and heat aff cted zone were analyzed. Acoustic birefringence of sh ar waves was measured by the ultra onic pulse echo method. For he bas metal, acoustic birefringen e was found to decrease monotonously. For heat affect d zone, a oustic birefringence was found to ch nge non-monotonously up to cycle ratio of 0.3 and decrease mon tonously after cycle ratio of 0.3. Based on the linear dependence of acoustic birefringence on the r l tive number of loading cycles, an ltrasonic te hnique is proposed for ass ss g fatigu amage. © 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 u der re ponsibility of scientific committe of the15th International C ference on Mechanics, Resource and Diagnostics of Materials and S ructur s. Keywords: low-carbon structural s eel; acoustic birefringence; heat affected zone; low-cycle fatigue 15th International Conference on Mechanics, Resource and Diagnostics of Materials and Structures Metallographic and ultrasonic studies of fatigue failure of ASTM 1020 steel in the base metal and heat affected zone A.V. Gonchar a , O.A. Sergeeva b , K.V. Kurashkin a * a Mechanical Engineering Research Institute of RAS - branch of the "Federal Research Center The Institute of Applied Physics of the RAS", 85, Belinskogo str., Nizhny Novgorod, 603024, Russian Federation b Volga-Spetsgidroenergomontazh – Kamspetsenergo, 8, Shlyuzovaya str, Naberezhnye Chelny,423800, Russian Federation

* Corresponding author. Tel.: +7-831-432-2159. E-mail address: avg-ndt@mail.ru * Corresponding author. Tel.: +7-831-432-2159. E-mail ad ress: avg-ndt@mail.ru

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 scientific committee of the15th International Conference on Mechanics, Resource and Diagnostics of Materials and Structures. 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 u der re ponsibility of scientific committe of the15th Int rnational C ference o Mechanics, Resource and Diagnostics of Mate ials and Structures.

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 scientific committee of the15th International Conference on Mechanics, Resources and Diagnostics

of Materials and Structures. 10.1016/j.prostr.2022.04.022