Characterisation of corrosion damage in T91/F91 steel exposed to static liquid lead-bismuth eutectic at 700-715 °C
Authors/Creators
- 1. Department of Engineering Science, University of Oxford, Parks Road, Oxford OX1 3PJ, UK
- 2. Department of Materials, University of Oxford, Parks Road, Oxford OX1 3PH, UK
- 3. Department of Nuclear Science & Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139, USA
Description
ABSTRACT: T91 samples were exposed to static liquid lead-bismuth eutectic (LBE) at 700-715 °C for 250-500 h in either an oxidising or reducing environment. Corrosion damage was characterised using electron microscopy techniques, which identified networks of LBE intrusion beneath LBE-wetted surfaces. Under reducing conditions these networks are uniformly distributed, while they appear patchier and deeper under oxidising conditions. The individual intrusions preferentially follow microstructural features, initially along prior-austenite grain boundaries, followed by penetration down martensite lath boundaries. Local depletion of Cr was observed within 4 μm of LBE intrusions and along intersecting boundaries, suggesting local Cr dissolution as the main corrosion mechanism.
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Additional details
Related works
- Is supplement to
- Journal article: 10.1016/j.jnucmat.2023.154687 (DOI)
Funding
- UK Research and Innovation
- Strategic Equipment - a Dual Beam FIB/SEM with large area patterning, EBSD and nanoprobe capabilities EP/N010868/1
- UK Research and Innovation
- Sir Henry Royce Institute - Oxford Equipment EP/R010145/1
- UK Research and Innovation
- Simultaneous Corrosion/Irradiation Testing in Lead and Lead-Bismuth Eutectic: The Radiation Decelerated Corrosion Hypothesis (RC-3) EP/T002808/1