暴露于液态铅铋共晶的T91/F91钢腐蚀损伤表征
Characterisation of Corrosion Damage in T91/F91 steel exposed to Liquid Lead-Bismuth Eutectic
AI总结：
研究通过电子显微技术表征T91钢在700°C液态LBE中氧化/还原环境下的腐蚀行为，揭示侵入路径及Cr局部溶解机制。
摘要：
将T91样品在氧化或还原环境中于700°C的静态液态铅铋共晶（LBE）中暴露250–500小时。采用电子显微技术表征腐蚀损伤，识别出LBE润湿表面下方的LBE侵入网络。在还原条件下，这些网络均匀分布；而在氧化条件下，其分布更不均匀且侵入更深。单个侵入优先沿微观结构特征扩展，最初沿原奥氏体晶界，随后沿马氏体板条界向下渗透。在侵入体周围4 μm范围内及相交晶界处观察到局部Cr贫化，表明局部Cr溶解是主要腐蚀机制。
英文摘要：
T91 samples were exposed to static liquid lead-bismuth eutectic (LBE) at 700°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 μm of the intrusions and along intersecting boundaries, suggesting local Cr dissolution as the main corrosion mechanism.
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