PSI - Issue 16

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

www.elsevier.com/locate/procedia

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ScienceDirect

Procedia Structural Integrity 16 (2019) 73–80

© 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the 6th International Conference “Fracture Mechanics of Materials and Structural Integrity” organizers. © 2019 The Author(s). Published by Elsevier B.V. Peer- review under responsibility of the 6th International Conference “Fracture Mechanics of Materials and Structural Integrity” organizers The investigation deals with the effectiveness of high frequency mechanical impact (HFMI) treatment technology to increase the corrosion resistance of a base metal and the fatigue life of as-welded T-shaped joints and after their long-time exploitation in con itio s modelling moderate climate. The conditions of moderate cli ate ere simulated by exposing the specimens in a oisture chamber of G4 at a temperature of 40 °C and air humidity of 98%. The microstructure of low alloy 15KhSND steel, weld zone and heat affected zone (HAZ) before and after the HFMI treatment was investigated. The corrosion tests of the base metal were carried out during 240, 480, 720, 960, 1200 and 2400 h, respectively. After exposure the specimens were removed and their weight reduction was defined. The duration of the corrosion test of the welded joints before fatigue tests was 1200 h. Corrosion-mechanical fracture of the hardened surface layer of the base metal, weld zone and HAZ after 1200 h of exposure is observed. The fatigue tests were carried out on six series of the welded T-joints of low alloy steel: as-welded and treated by HFMI on air; as-welded and treated by HFMI states after exposin g in the chamber of G4; after accumulation 2·10 6 cycles an exposing in the chamber G4; after accumulation 2·10 6 cycles, exposing in the chamber G4 and subsequent treated by HFMI. It was established by the experiment that the use of HFMI technology can significantly increase the fatigue life of the welded T-joints of steel structures. © 2019 The Author(s). Published by Elsevier B.V. Peer- review under responsibility of the 6th International Conference “Fracture Mechanics of Materials and Structural Integrity” organizers 6th International Conference “Fracture Mechanics of Materials and Structural Integrity” Influence of the atmosphere corrosion on the fatigue life of welded T-joints treated by high frequency mechanical impact Vitalii Knysh*, Sergii Solovei, Lyudmila Nyrkova, Illya Klochkov, Svіatoslav Motrunich E.O. Paton Electric Welding Institute of the National Academy of Sciences of Ukraine, 11, Kazymyr Malevich St., Kyiv 03150, Ukraine The investigation deals with the effectiveness of high frequency mechanical impact (HFMI) treatment technology to increase the corrosion resistance of a base metal and the fatigue life of as-welded T-shaped joints and after their long-time exploitation in conditions modelling moderate climate. The conditions of moderate climate were simulated by exposing the specimens in a moisture chamber of G4 at a temperature of 40 °C and air humidity of 98%. The microstructure of low alloy 15KhSND steel, weld zone and heat affected zone (HAZ) before and after the HFMI treatment was investigated. The corrosion tests of the base metal were carried out during 240, 480, 720, 960, 1200 and 2400 h, respectively. After exposure the specimens were removed and their weight reduction was defined. The duration of the corrosion test of the welded joints before fatigue tests was 1200 h. Corrosion-mechanical fracture of the hardened surface layer of the base metal, weld zone and HAZ after 1200 h of exposure is observed. The fatigue tests were carried out on six series of the welded T-joints of low alloy steel: as-welded and treated by HFMI on air; as-welded and treated by HFMI states after exposin g in the chamber of G4; after accumulation 2·10 6 cycles and exposing in the chamber G4; after accumulation 2·10 6 cycles, exposing in the chamber G4 and subsequent treated by HFMI. It was established by the experiment that the use of HFMI technology can significantly increase the fatigue life of the welded T-joints of steel structures. 6th International Conference “Fracture Mechanics of Materials and Structural Integrity” Influence f he atmosphere cor osio on th f tigue l fe of welded T-joints treated by high frequency mechanical impact Vitalii Knysh*, Sergii Solovei, Lyudmila Nyrkova, Illya Klochkov, Svіatoslav Motrunich E.O. Paton Electric Welding Institute of the National Academy of Sciences of Ukraine, 11, Kazymyr Malevich St., Kyiv 03150, Ukraine Abstract Abstract Keywords: Welded joint; high frequency mechanical impact; peening; corrosion environment; corrosion resistance; fatigue; fatigue life.

Keywords: Welded joint; high frequency mechanical impact; peening; corrosion environment; corrosion resistance; fatigue; fatigue life.

* Corresponding author. Tel.:+38-044-205-2382. E-mail address: knyshj@paton.kiev.ua * Corresponding author. Tel.:+38-044-205-2382. E-mail address: knyshj@paton.kiev.ua

2452-3216 © 2019 The Author(s). Published by Elsevier B.V. Peer- review under responsibility of the 6th International Conference “Fracture Mechanics of Materials and Structural Integrity” organizers 2452-3216 © 2019 The Author(s). Published by Elsevier B.V. Peer- review under responsibility of the 6th International Conference “Fracture Mechanics of Materials and Structural Integrity” organizers

2452-3216  2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the 6th International Conference “Fracture Mechanics of Materials and Structural Integrity” organizers. 10.1016/j.prostr.2019.07.024