20.500.12556/DiRROS-17327 Elucidating nucleation stages of transgranular stress corrosion cracking in austenitic stainless steel by in situ electrochemical and optical methods The pitting and environmentally assisted cracking resistance of austenitic stainless steels (SS) is challenged in several industrial applications particularly those involving hot chloride-concentrated streams. Directional drilling used in the oil and gas exploration is one of these applications. Indeed, high strength CrMn-SS commonly used in drilling technology have a high tendency to fail by stress corrosion cracking (SCC) preceded by localized corrosion once subjected to highly chloride-concentrated drilling fluids at elevated temperatures. A comprehensive understanding regarding the mechanisms governing the transition from pitting into SCCis not currently available, though. Therefore, mechanistic aspects such as the effect of loading conditions on pit nucleation and repassivation as well as the synergistic effect between pit stabilization and the nucleation of a stress corrosion crack are of great practical significance. To investigate this an electrochemical-, optical- and mechanical- monitored SCC test was conducted on a CrMn-SS in an alkaline brine at elevated temperature. The transition from metastable to stable pitting and subsequently to SCC in this system was documented in-situ for the first time. Results supported H.S. Isaacs postulates regarding the interpretation of electrochemical signals and demonstrated that loading conditions affect pit nucleation and repassivation leading to a higher susceptibility of the material to pitting, which preceded SCC. pitting corrosion stress corrosion cracking monitoring elektrochemical noise austenitic stainless steel jamičasta korozija napetostno korozijsko pokanje moniotoring elektrokemijski šum avstenitno nerjavno jeklo true false true Electrochemical Society Angleški jezik Slovenski jezik © The Author(s) 2019. Published by ECS. Neznano 2023-11-23 08:10:11 2023-11-23 08:10:11 2023-11-24 03:36:04 0000-00-00 00:00:00 2019 0 0 Nasl. z nasl. zasl.; Opis vira z dne 27. 8. 2019; str. C3326-C3335 iss. 11 Vol. 166 2019 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 2019-05-31 544.5/.6 1945-7111 10.1149/2.0411911jes 2482535 http://jes.ecsdl.org/content/166/11/C3326.full.pdf+html 1 f69f16dd-89c6-11ee-9ccb-001a4af901a5 https://dirros.openscience.si/Dokument.php?lang=slv&id=23532 RAZ_Helmuth_Sarmiento_Klapper_2019.pdf RAZ_Helmuth_Sarmiento_Klapper_2019.pdf 1 A1423C20506CC63A07ADFBD072F9D4F9 6d8321001a73ff0efa0d9458530a96aeec0f286fce777c047a382ac4401532ff a843801d-89c7-11ee-9ccb-001a4af901a5 https://dirros.openscience.si/Dokument.php?lang=slv&id=23533 Zavod za gradbeništvo Slovenije 0 0 0