|About this Abstract
||2023 TMS Annual Meeting & Exhibition
||High Performance Steels
||Analysing the corrosion of T91 in liquid lead-bismuth-eutectic
||Minyi Zhang, Guanze He, Mark Tom Lapington, Weiyue Zhou, Michael P. Short, Paul A.J. Bagot, Felix Hofmann, Michael P. Moody
|On-Site Speaker (Planned)
The issue of corrosion and its dependence on irradiation remains the bottleneck in lead-bismuth-eutectic (LBE) cooled fast reactor designs. To reveal the changes occurring at the interface of lead and steel, high resolution characterisation techniques are required. We have investigated the static corrosion of T91 steel in LBE across multiple length scales using SEM/EDX, TEM, STEM, and APT. We find chromium depletion up to 10 μm away from the lead-steel interface, combined with dissolution of chromium-enriched precipitates. Furthermore, lead seems to corrode T91 grain-by-grain rather than penetrating into grain boundaries. TEM combined with EDX reveals vanadium-enriched precipitates at the T91-lead interface, suggesting that vanadium-enriched precipitates have higher resistance to corrosion than chromium-enriched precipitates. APT analysis also reveals a thin oxide layer at the T91-lead interface even under reducing conditions. Together these observations provide a rich picture of the corrosion process.
||Iron and Steel, Nuclear Materials, Characterization