PSI - Issue 54

Available online at www.sciencedirect.com Available online at www.sciencedirect.com Available online at www.sciencedirect.com

ScienceDirect

Procedia Structural Integrity 54 (2024) 340–353 Structural Integrity Procedia 00 (2023) 000–000 Structural Integrity Procedia 00 (2023) 000–000

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

© 2023 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 ICSI 2023 organizers Abstract O ff shore structures, including oil and gas platforms, wind turbines, and wave energy converters, are subject to harsh environmen tal conditions and high-stress cyclic loading. The reliability and safety of these structures are critical, and the performance of welded joints is a key factor in ensuring their structural integrity. Employing precise welding techniques are essential to minimize degradation of the mechanical properties of welded joints, particularly in preventing the formation of brittle phases and ensuring long-term service reliability. To accomplish this, a thorough examination of the hardness properties of two di ff erent S690QL steel welded joints was conducted using Vickers hardness testing. Additionally, scanning electron microscopy with energy dispersive X-ray spectroscopy (SEM-EDS) was used to complement the hardness assessments. Thicker joints show lower hardness values in the heat-a ff ected zone due to slower cooling rates. Conversely, higher hardness values in the upper sections of welds imply the influence of increased heat input during final tempering steps. This research underscores the significance of precise heat treat ment techniques in mitigating residual stresses, controlling the characteristics of the heat-a ff ected zone and enhancing mechanical properties, thus contributing to improve structural integrity and safety. © 2023 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http: // creativecommons.org / licenses / by-nc-nd / 4.0 / ) Peer-review under responsibility of the scientific committee of the ICSI 2023 organizers. Keywords: Structures; High-strength steel; S690QL; Microstructure; Welded joints; Vickers hardness test; SEM-EDS analysis International Conference on Structural Integrity 2023 (ICSI 2023) Microstructure and Hardness Properties of a S690QL Steel Welded Joint Paulo Mendes a, ∗ , Ma´rio Monteiro b , Rui Pedro Silva c , Jose´ A.F.O Correia a , Ab´ılio M.P de Jesus b , Manuel Vieira b , Tiago Pereira d , AnaReis c a CONSTRUCT, Faculty of Engineering, University of Porto, Rua Dr. Roberto Frias, 4200-465, Porto, Portugal b Faculty of Engineering, University of Porto, Rua Dr. Roberto Frias, 4200-465, Porto, Portugal c INEGI - Instituto de Cieˆncia e Inovac¸a˜o em Engenharia Mecaˆnica e Gesta˜o Industrial, 4200-465, Porto, Portugal d MARTIFER SGPS, Zona Industrial, 3684-001, Oliveira de Frades, Portugal Abstract O ff shore structures, including oil and gas platforms, wind turbines, and wave energy converters, are subject to harsh environmen tal conditions and high-stress cyclic loading. The reliability and safety of these structures are critical, and the performance of welded joints is a key factor in ensuring their structural integrity. Employing precise welding techniques are essential to minimize degradation of the mechanical properties of welded joints, particularly in preventing the formation of brittle phases and ensuring long-term service reliability. To accomplish this, a thorough examination of the hardness properties of two di ff erent S690QL steel welded joints was conducted using Vickers hardness testing. Additionally, scanning electron microscopy with energy dispersive X-ray spectroscopy (SEM-EDS) was used to complement the hardness assessments. Thicker joints show lower hardness values in the heat-a ff ected zone due to slower cooling rates. Conversely, higher hardness values in the upper sections of welds imply the influence of increased heat input during final tempering steps. This research underscores the significance of precise heat treat ment techniques in mitigating residual stresses, controlling the characteristics of the heat-a ff ected zone and enhancing mechanical properties, thus contributing to improve structural integrity and safety. © 2023 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http: // creativecommons.org / licenses / by-nc-nd / 4.0 / ) Peer-review under responsibility of the scientific committee of the ICSI 2023 organizers. Keywords: Structures; High-strength steel; S690QL; Microstructure; Welded joints; Vickers hardness test; SEM-EDS analysis International Conference on Structural Integrity 2023 (ICSI 2023) Microstructure and Hardness Properties of a S690QL Steel Welded Joint Paulo Mendes a, ∗ , Ma´rio Monteiro b , Rui Pedro Silva c , Jose´ A.F.O Correia a , Ab´ılio M.P de Jesus b , Manuel Vieira b , Tiago Pereira d , AnaReis c a CONSTRUCT, Faculty of Engineering, University of Porto, Rua Dr. Roberto Frias, 4200-465, Porto, Portugal b Faculty of Engineering, University of Porto, Rua Dr. Roberto Frias, 4200-465, Porto, Portugal c INEGI - Instituto de Cieˆncia e Inovac¸a˜o em Engenharia Mecaˆnica e Gesta˜o Industrial, 4200-465, Porto, Portugal d MARTIFER SGPS, Zona Industrial, 3684-001, Oliveira de Frades, Portugal

Nomenclature Nomenclature

J30 J60 J30 J60

30-millimeters thickness welded joint 60-millimeters thickness welded joint 30-millimeters thickness welded joint 60-millimeters thickness welded joint

∗ Corresponding author. Tel.: + 351 220 413 789 E-mail address: pjmendes@fe.up.pt ∗ Corresponding author. Tel.: + 351 220 413 789 E-mail address: pjmendes@fe.up.pt

2452-3216 © 2023 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 ICSI 2023 organizers 10.1016/j.prostr.2024.01.092 2210-7843 © 2023 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http: // creativecommons.org / licenses / by-nc-nd / 4.0 / ) Peer-review under responsibility of the scientific committee of the ICSI 2023 organizers. 2210-7843 © 2023 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http: // creativecommons.org / licenses / by-nc-nd / 4.0 / ) Peer-review under responsibility of the scientific committee of the ICSI 2023 organizers.