PSI - Issue 39

ScienceDirect Available online at www.sciencedirect.com ScienceDirect Procedia Structural Integrity 00 (2021) 000–000 Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceDirect Procedia Structural Integrity 00 (2021) 000–000

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

Procedia Structural Integrity 39 (2022) 466–469

© 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 CP 2021 – Guest Editors © 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 CP 2021 – Guest Editors Keywords: eutectoid steel; prestressing steel; pearlitic steel; cold drawing; pearlitic microstructure; drawing-induced microstructural evolution; microstructural orientation; pearlite interlamellar spacing decrease; environmentally assisted cracking (EAC); hydrogen embrittlement (HE); hydrogen assisted cracking (HAC); HAC paths; anisotropic behaviour. Abstract This paper analyses hydrogen assisted cracking (HAC) paths in cold drawn pearlitic steels in which progressive cold drawing produces a preferential orientation of the pearlitic microstructure i the matter of colonies and lamellae, thereby inducing strength anisotropy in the st el, and thus the resistance to HAC is a directional property that depends on the angl in relation to the drawi direction. Therefore, an initial transverse crack changes its propagatio direction to approach that of th wire axis, thus producing mixed mode propagation, the deflection angle being an increasing function of the cold drawing degree. This experimental result may be explained by micro-mechanical considerations on the basis of the lamellar microstructure of the steels. A relationship is established between t e microstructural angles and the deflection angles of the macroscopic HAC path, thus providing a materials science type relationship between the microstructure and the macroscopic crack. © 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 CP 2021 – Guest Editors Keywords: eutectoid s eel; r stressi g steel; pearliti steel; old drawing; pearlitic micro tructure; drawing-induce microstructural volution mic structural orientat on; pearlite interl mell r pacing d crease; environmentally assisted cracking (EAC); hydrogen embrittlement (HE); hydrogen assisted cracking (HAC); HAC paths; anisotropic behaviour. 7th International Conference on Crack Paths Hydrogen assisted cracking paths in cold drawn pearlitic steels Jesús Toribio*, Elena Ovejero Fracture & Structural Integrity Research Group (FSIRG), University of Salamanca (USAL) E.P.S., Campus Viriato, Avda. Requejo 33, 49022 Zamora, Spain Abstract This paper analyses hydrogen assisted cracking (HAC) paths in cold drawn pearlitic steels in which progressive cold drawing produces a preferential orientation of the pearlitic microstructure in the matter of colonies and lamellae, thereby inducing strength anisotropy in the steel, and thus the resistance to HAC is a directional property that depends on the angle in relation to the drawing direction. Therefore, an initial transverse crack changes its propagation direction to approach that of the wire axis, thus producing mixed mode propagation, the deflection angle being an increasing function of the cold drawing degree. This experimental result may be explained by micro-mechanical considerations on the basis of the lamellar microstructure of the steels. A relationship is established between the microstructural angles and the deflection angles of the macroscopic HAC path, thus providing a materials science type relationship between the microstructure and the macroscopic crack. 7th International Conference on Crack Paths Hydrogen assisted cracking paths in cold drawn pearlitic steels Jesús Toribio*, Elena Ovejero Fracture & Structural Integrity Research Group (FSIRG), University of al manca (USAL) E.P.S., Campus Viriato, Avda. Requejo 33, 49022 Zamora, Spain

* Corresponding author. Tel.: +34-677566723; fax: +34-980545002. E-mail address: toribio@usal.es * Correspon ing author. Tel.: +34-677566723; fax: +34-980545002. E-mail address: toribio@usal.es

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 CP 2021 – Guest Editors 2452-3216 © 2021 The Authors. Published by ELSEVIER B.V. This is an ope acces article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of CP 2021 – Guest Editors

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 CP 2021 – Guest Editors 10.1016/j.prostr.2022.03.116