UNDERSTANDING THE ROLE OF GRAIN BOUNDARY MIGRATION ON THE INITIATION STAGES OF PWSCC

Liberato Volpe, M. Grace Burke, Fabio Scenini

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

Abstract

Preferential Intergranular Oxidation (PIO) and Diffusion-Induced Grain Boundary Migration (DIGM) have been proposed as “precursor events” for Primary Water Stress Corrosion Cracking (PWSCC) in Ni-base Alloy 600. However, the direct link between the crack initiation sites and the “precursor events” PIO/DIGM has not yet been proven via experimental data. In this study, oxidation and stress corrosion cracking experiments were conducted on solution-annealed Alloy 600 in low pressure superheated H2-steam, an environment that it can accelerate the oxidation kinetics whilst maintaining the electrochemical potential relevant to Pressurized Water Reactor (PWR) primary water. Advanced microstructural analysis techniques, including Focus Ion Beam (FIB) cross-section samples and Analytical Electron Microscopy (AEM), were used to characterize the samples after the SCC tests. The results showed that SCC initiated in the preferentially oxidized grain boundaries that had also experienced local solute redistribution associated with DIGM. The role of the DIGM and the PIO on the early stages of the PWSCC are discussed and the role of PIO and DIGM “precursor events” on the initiation stages of the SCC are proposed.

Original languageEnglish
Title of host publication19th International Conference on Environmental Degradation of Materials in Nuclear Power Systems - Water Reactors
Publication statusAccepted/In press - 1 Jul 2019
Event19th International Conference on Environmental Degradation of Materials in Nuclear Power Systems - Water Reactors - Boston, United States
Duration: 18 Aug 2019 → 22 Aug 2019
http://envdeg.ans.org/

Conference

Conference19th International Conference on Environmental Degradation of Materials in Nuclear Power Systems - Water Reactors
Country/TerritoryUnited States
CityBoston
Period18/08/19 → 22/08/19
Internet address

    Embargoed Document

  • Volpe et al - AAM manuscript

    Accepted author manuscript, 776 KB

    Embargo ends: 1/01/29

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  • MPC: Materials Performance Centre

    Burke, G. (PI), Engelberg, D. (PI), Preuss, M. (PI), Frankel, P. (PI), Jimenez-Melero, E. (PI), Pickering, E. (PI), Scenini, F. (PI), Stevens, N. (PI), Race, C. (PI), Connolly, B. (PI), Abdallah, M. (PGR student), Armson, S. (PGR student), Attar, H. (PGR student), Barron, P. (PGR student), Bird, J. (PGR student), Brown, A. (PGR student), Bruce, K. (PGR student), Buxton, O. (PGR student), Cassineri, S. (PGR student), Cattivelli, A. (PGR student), Chen, W. (PGR student), Collins, J. (PGR student), Debenham, L. (PGR student), Eaton-Mckay, J. (PGR student), Eguchi, K. (PGR student), Foster, D. (PGR student), Fox, C. (PGR student), Garrett, A. (PGR student), Gredis, A. (PGR student), Grime, T. (PGR student), Hou, J. (PGR student), Howe, B. (PGR student), Hughes, J. (PGR student), Hunt, C. (PGR student), Islam, U. (PGR student), Jalil, R. (PGR student), Jones, C. (PGR student), Kablan, A. (PGR student), Kapousidou, M. (PGR student), Koc, O. (PGR student), Kroll, R. (PGR student), Lang, R. (PGR student), Lennard, J. (PGR student), Liubercev, S. (PGR student), Mahmood, S. (PGR student), Maric, M. (PGR student), Martin, C. (PGR student), Mazzei, G. (PGR student), Rigby-Bell, M. (PGR student), Rogers, M. (PGR student), Sanchez, C. (PGR student), Shah, Z. (PGR student), Stavroulakis, E. (PGR student), Stuglik, P. (PGR student), Suleman, T. (PGR student), Supornpaibul, N. (PGR student), Thornley, S. (PGR student), Volpe, L. (PGR student), Wang, H. (PGR student), Wilson, M. (PGR student), Wilson, A. (PGR student), Woodward, T. (PGR student), Wylie, A. (PGR student), Xu, X. D. (PGR student), Yankova, M. (PGR student), Yildirim, E. (PGR student), Zhou, Y. (PGR student), Zhu, S. (PGR student), Barzdajn, B. (CoI), Carruthers, A. (CoI), Cassineri, S. (CoI), Chang, L. (CoI), Obasi, G. (CoI), Palko, S. (CoI), Reccagni, P. (CoI), Tang, R. (CoI), Thomas, R. (CoI), Unnikrishnan, R. (CoI), Zhang, Z. (CoI), Zhou, Y. (CoI) & Aspinall, A. (Support team)

    1/01/02 → …

    Project: Research

  • Understanding the mechanisms controlling low potential stress corrosion cracking in nuclear reactors

    Scenini, F., Burke, G. & Quinta Da Fonseca, J.

    1/12/17 → 31/05/21

    Project: Research

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