This work investigated the original microstructure of cold-worked alumina-forming austenitic steel, along with its precipitation and dissolution corrosion behaviors in lead-bismuth eutectic with 10^-8 wt.% oxygen at 600°C, using solution-annealed steel for comparison. Anomalously, cold-worked steel presented milder corrosion compared to solution-annealed steel, with average corrosion depths of 314.3 and 401.0 μm after 1700 h exposure. Cold working-induced de-twinning transformed the annealing twin boundaries into normal high-angle grain boundaries (NGBs), increasing NGBs proportion from 36% to 89%. The increased NGBs provided more nucleation sites for intergranular barriers composed of alternate NiAl and M₂₃C₆ precipitates, thus better obstructing the dissolution attack.

中文翻译：

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在 600°C 下暴露于 10-8 wt.% 氧气的铅铋共晶中，通过解孪晶和沉淀对氧化铝形成奥氏体钢的溶解腐蚀产生协同抑制作用


本工作以固溶退火钢为研究对象，研究了冷加工氧化铝形成奥氏体钢的原始微观结构，以及其在 600°C 下含 ^10-8 wt.% 氧的铅铋共晶中的析出和溶解腐蚀行为。异常的是，与固溶退火钢相比，冷作钢的腐蚀更温和，暴露 1700 小时后的平均腐蚀深度分别为 314.3 和 401.0 μm。冷加工诱导的去孪晶将退火孪晶界转变为正常的高角度晶界 （NGB），将 NGBs 比例从 36% 提高到 89%。增加的 NGBs 为由 NiAl 和 M₂₃C₆ 交替沉淀物组成的晶间屏障提供了更多的成核位点，从而更好地阻止了溶出攻击。