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arXiv · 2302.03470

Characterisation of Corrosion Damage in T91/F91 steel exposed to Liquid Lead-Bismuth Eutectic

M. T. Lapington·M. Zhang·M. P. Moody·W. Y. Zhou·M. P. Short·F. Hofmann
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Abstract

T91 samples were exposed to static liquid lead-bismuth eutectic (LBE) at 700{\deg}C for 250-500 hours 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 {\mu}m of the intrusions and along intersecting boundaries, suggesting local Cr dissolution as the main corrosion mechanism.

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M. T. Lapington, M. Zhang, M. P. Moody, W. Y. Zhou, M. P. Short, F. Hofmann. 2023-02-07. Characterisation of Corrosion Damage in T91/F91 steel exposed to Liquid Lead-Bismuth Eutectic. https://doi.org/10.1016/j.jnucmat.2023.154687

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