PSI - Issue 26

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

www.elsevier.com/locate/procedia

ScienceDirect

Procedia Structural Integrity 26 (2020) 368–375

© 2020 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 MedFract1 organizers Abstract Progressive cold drawing in eutectoid steel produces a preferential orientation of pearlitic colonies and ferrite/cementite lamellae, thus inducing strength anisotropy in the steel and mixed mode propagation. While in the hot rolled steel (not cold drawn) the pearlitic microstructure is randomly oriented and the crack progresses in hydrogen by breaking the ferrite/cementite lamellae, in heavily drawn steels the pearlitic microstructure is fully oriented and the predominant mechanism of hydrogen assisted cracking is the delamination (or decohesion) at the ferrite/cementite interface. © 2020 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 MedFract1 organizers Keywords: Pearlitic steel; cold drawing; microstructural orientation; hydrogen embrittlement; hydrogen-assisted micro-damage; HELP; HEDE. 1. Introduction Materials microstructure plays a relevant role in the matter of crack paths and macroscopic behavior. With regard to cold-drawn eutectoid pearlitic steels, the question of whether (or not) there is a preferential orientation of the two basic microstructural levels (pearlite colonies and ferrite/cementite lamellae) is of primary importance. A v a ess article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc The 1 st Mediterranean Conference on Fracture and Structural Integrity, MedFract1 Hydrogen-assisted cracking paths in oriented pearlitic microstructures: Resembling Donatello Wooden Sculpture Texture (DWST) & Mantegna’s Dead Christ Perspective (MDCP) Jesús Toribio * Fracture & Structural Integrity Research Group (FSIRG), University of Salamanca (USAL) E.P.S., Campus Viriato, Avda. Requejo 33, 49022 Zamora, Spain

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

2452-3216 © 2020 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 MedFract1 organizers

2452-3216 © 2020 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 MedFract1 organizers 10.1016/j.prostr.2020.06.047