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Multiscale correlative tomography: an investigation of creep cavitation in 316 stainless steel

Slater, T. J. A., Bradley, R. S., Bertali, G., Geurts, R., Northover, S. M., Burke, M. G., Haigh, S. J., Burnett, T. L. and Withers, P. J. 2017. Multiscale correlative tomography: an investigation of creep cavitation in 316 stainless steel. Scientific Reports 7 (1) , 7332. 10.1038/s41598-017-06976-5

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Abstract

Creep cavitation in an ex-service nuclear steam header Type 316 stainless steel sample is investigated through a multiscale tomography workflow spanning eight orders of magnitude, combining X-ray computed tomography (CT), plasma focused ion beam (FIB) scanning electron microscope (SEM) imaging and scanning transmission electron microscope (STEM) tomography. Guided by microscale X-ray CT, nanoscale X-ray CT is used to investigate the size and morphology of cavities at a triple point of grain boundaries. In order to understand the factors affecting the extent of cavitation, the orientation and crystallographic misorientation of each boundary is characterised using electron backscatter diffraction (EBSD). Additionally, in order to better understand boundary phase growth, the chemistry of a single boundary and its associated secondary phase precipitates is probed through STEM energy dispersive X-ray (EDX) tomography. The difference in cavitation of the three grain boundaries investigated suggests that the orientation of grain boundaries with respect to the direction of principal stress is important in the promotion of cavity formation.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Chemistry
Additional Information: This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
Publisher: Nature Research
ISSN: 2045-2322
Date of First Compliant Deposit: 24 February 2022
Last Modified: 24 Feb 2022 12:00
URI: https://orca.cardiff.ac.uk/id/eprint/147203

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