Characterisation of corrosion damage in T91/F91 steel exposed to static liquid lead-bismuth eutectic at 700-715 °C
Characterisation of corrosion damage in T91/F91 steel exposed to static liquid lead-bismuth eutectic at 700-715 °C
复制标题
T91/F91钢在700-715℃静态液态铅铋共晶中的腐蚀损伤表征
DOI：
10.1016/j.jnucmat.2023.154687
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发表时间：
2023
影响因子：
3.1
通讯作者：
Lapington M
中科院分区：
文献类型：
--
作者：
Lapington M
T91 样品在氧化或还原环境中暴露于 700–715°C 的静态液态铅铋共晶 (LBE) 中 250–500 小时。使用电子显微镜技术对腐蚀损伤进行了表征，该技术识别了 LBE 润湿表面下方的 LBE 侵入网络。在还原条件下，这些网络是均匀分布的，而在氧化条件下，它们显得更加斑驳和更深。各个侵入优先遵循微观结构特征，首先沿着原奥氏体晶界，然后沿着马氏体板条边界渗透。在 LBE 侵入 4 μm 范围内以及沿着相交边界观察到 Cr 的局部损耗，表明局部 Cr 溶解是主要的腐蚀机制。
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.