Wojcik, A;
Waitt, M;
Santos, AS;
Shibli, A;
(2021)
Electrical potential drop for monitoring creep damage in high temperature plant.
Materials at High Temperatures
, 38
(5)
pp. 330-341.
10.1080/09603409.2021.1971144.
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Abstract
Electrical potential drop (EPD) is a powerful technique to gauge crack depth in many contexts, including fracture, creep and fatigue testing, and in-field NDE, however it has only seen limited use for monitoring pre-crack creep cavitation damage. The authors have previously reported promising results using a combination of AC and DC EPD on large pressure vessel creep tests, even detecting incipient damage. However, that study lacked linkage to the underlying microstructural mechanisms. Here we present the results of a more fundamental creep study using EPD on P91 pressure vessel steel specimens taken from weldments, suffering HAZ-related Type IV cracking. This work confirmed that EPD could detect incipient damage, with ACPD being particularly sensitive to life fraction, but allowed linkage to changes in material properties, such as permeability and resistivity. Discussion of the implications for future off-line (in-field) NDE methods and on-line continuous monitoring of high-temperature plant components is also made.
| Type: | Article |
|---|---|
| Title: | Electrical potential drop for monitoring creep damage in high temperature plant |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1080/09603409.2021.1971144 |
| Publisher version: | https://doi.org/10.1080/09603409.2021.1971144 |
| Language: | English |
| Additional information: | Copyright © 2021 The Author(s). This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. |
| Keywords: | Electrical potential drop, EPD, ACPD, DCPD, creep, incipient damage, pressure vessels, P91, on-line monitoring, type iv cracking |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Mechanical Engineering |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10134707 |
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