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 t . i ir t. i i tr ct ral I te rit r ce ia ( )

www.elsevier.com/locate/procedia .else ier.c /l cate/ r ce ia

ScienceDirect

Procedia Structural Integrity 26 (2020) 360–367

st

© 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 This paper provides a definition and identification of a new (non-conventional) microstructural unit in cold drawn pearlitic steel: the pearlitic pseudocolony , a special pearlitic colony in which the lamellae are not oriented along the wire axis or cold drawing direction (contrarily to what happens in the normal conventional colonies), thereby producing a clearly anomalous (very high) local interlamellar spacing, making the pseudocolonies weakest units or potential fracture initiation loci and promoting crack deflection associated with anisotropic fracture behavior and mixed-mode propagation © 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; pearlitic pseudocolony; local interlamellar spacing; crack deflection; anisotropic fracture; mixed mode cracking. 1. Introduction The prestressed concrete technique in civil engineering requires the use of heavily cold drawn pearlitic steels in the form of prestressing wires (Toribio, 1992) that have undergone severe plastic strain. The manufacturing process consists of progressive cold drawing in several steps to increase the yield strength by a strain hardening mechanism, thus inducing microstructural changes in the material in the form of orientation of the pearlitic microstructure. Abstract is a er r i es a efi iti a i e tificati f a e ( -c e ti al) icr str ct ral it i c l ra earlitic steel: t e e rlitic se c l y , a s ecial earlitic c l i ic t e la ellae are t rie te al t e ire a is r c l ra i irecti (c traril t at a e s i t e r al c e ti al c l ies), t ere r ci a clearl a al s ( er i ) l cal i terla ellar s aci , a i t e se c l ies ea est its r te tial fract re i itiati l ci a r ti crac eflecti ass ciate it a is tr ic fract re e a i r a i e - e r a ati 202 e Authors. Published by Elsevier B.V. is is a en access article u der the CC -NC- lice se ( tt ://creati ec s. r /licenses/by-nc-n / . /) eer-re ie er res si ilit f e ract r a izers ey r s: earlitic steel; c l ra i ; earlitic se c l ; l cal i terla ellar s aci ; crac eflecti ; a is tr ic fract re; i e e crac i . . I t ti r str ss r t t i i i il i ri r ir s t s f il l r rliti st ls i t f r f r str ssi ir s ( ri i , ) t t r s r l sti str i . f t ri r ss sists f r r ssi l r i i s r l st s t i r s t i l str t str i r i is , t s i i i r str t r l s i t t ri l i t f r f ri t ti f t rliti i r str t r . The 1 st Mediterranean Conference on Fracture and Structural Integrity, MedFract1 Identification of a new microstructural unit in cold drawn pearlitic steel: The pearlitic pseudocolony Jesús Toribio * Fracture & Structural Integrity Research Group (FSIRG), University of Salamanca (USAL) E.P.S., Campus Viriato, Avda. Requejo 33, 49022 Zamora, Spain it rr f r r t r tr t r l I t rit , r t in cold drawn pearlitic steel: The pearlitic pseudocolony i i r ct re tr ct r l I te rity ese rc r ( I ), iversity f l c ( ) . . ., s iri t , v . e ej , r , i

* Corresponding author. Tel.: +34-677566723; fax: +34-980545002. E-mail address: toribio@usal.es i a t r. el.: - ; fa : - - il ress: t ri i sal.es rres

.

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 e t rs. lis e lse ier . . is is a e access article er t e - - lice se ( tt ://creati ec s. r /lice ses/ - c- / . /) eer-re ie er res si ilit f e ract r a izers -

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.2020.06.046