PSI - Issue 26

Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2020) 000 – 000 il l li t . i ir t. tr t r l I t rit r i ( )

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ScienceDirect

Procedia Structural Integrity 26 (2020) 113–119

The 1 st Mediterranean Conference on Fracture and Structural Integrity, MedFract1 Investigation of certain mechanical and magnetic properties of a stressed low – carbon steel after corrosion in NaCl – water solution V.N. Kytopoulos a*1 , A. Altzoumailis b , Chr. Panagopoulos c , Chr. Riga a a School of Applied Mathematical and Physical Sciences, National Technical University of Athens, 5 Heroes of Polytechnion Avenue 157 73 Athens, Greece The 1 st , ulo a a l f li t ti l i l i , ti l i l i it f t , f l t i t ,

b School of Chemical Engineering, National Technical University of Athens, Zografou Campus, 9 Heroes of Polytechnion Avenue, 15773 Athens, Greece, c School of Metallurgical and Mining Engineering, National Technical University of Athens, 9 Heroes of Polytechnion Avenue, 15773 Athens, Greece i , ti l i l i it f t , f , f l t i , t , , l f t l i l i i i i , ti l i l i it f t , f l t i , t , b l f i l i

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© 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 Atomic hydrogen produced by corrosion of a low-carbon steel in NaCl – Water solution may markedly affect its certain tensile mechanical and magnetic properties in a complex and peculiar manner. This influence was investigated by employing the intrinsic micromagnetic emission (ME)-response as well as tensile mechanical response of this ferromagnetic material, and also by introduction a relevant measurement parameter of specific micromagnetic emission response. In this fashion, it was shown that an increase in the hydrogen accumulation with corrosion time leads to an associated increase in the pervasive and embrittling influence expressed by a marked loss in ductility of the material. It was also shown that the competitive interplay of cumulative hydrogen, applied stress and plastic strain induced microstructural damage was related to a specific ME-response parameter by which an increased magnetic hardening tendency of material with corrosion time was established. In general, embrittlement and magnetic hardening are parallel products of stress- assisted hydrogen accumulation, where magnetic hardening process seems to be in a time processing advance of embrittlement one. The above findings allow to estimate that the magnetic properties are more susceptible to hydrogen effects than the mechanical ones. © 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: J – parameter, hydrogen accumulation; corrosion; stress; strain; embrittlement; magnetic hardening; pinning; domain wall t i i l t l i l t l ti l t it t i t il i l ti ti i l li . i i l i ti t l i t i t i i i ti i i ll t il i l t i ti t i l, l i t ti l t t t i i i ti i i . t i i , it t t i i t l ti it i ti t i t i i t i ittli i l l i tilit t t i l. t l t t t titi i t l l ti , li t l ti t i i i t t l l t t i i t i i ti i t t i l it i ti t li . l, ittl t ti i ll l t t i t l ti , ti i t i ti i ittl t . i i ll t ti t t t t ti ti ti l t t t t i l . 202 Aut ors. ublis y El vier . . This is an open ac rticl und r t B - - li ( tt :// r ti . r /li / - - / . /) r-r i r r i ilit f r t r i r r s: J r t r, r l ti ; rr si ; str ss; str i ; rit l t; ti r i ; i i ; i l l

* Corresponding author. Tel.: +30 210 7721226; fax: _30 210 7721302. E-mail address: victor@central.ntua.gr rr s i t r. l.: ; f : . - il r ss: i t r tr l. t . r

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 - t r . li l i r . . i i rti l r t - - li ( tt :// r ti . r /li / - - / . /) r-r i r r i ilit f r t r i r

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.2020.06.014