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High-resolution Characterization of Cold Working Effects on the Oxidation Behavior of Alumina-Forming Austenitic (AFA) Steel in Lead-Bismuth Eutectic (LBE) with 10-6 Wt.% Oxygen at 600°C

Decang Zhang,Xiaoxin Zhang,Xian Zeng, Jun Zhang,Hao Ren, Fanao Meng,Qingzhi Yan

Journal of Nuclear Materials(2025)SCI 2区SCI 1区

China Nuclear Power Technology Research Institute

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Abstract
The solution-annealed and cold-worked AFA steels with surface grinding exposed to LBE at 600°C with 10-6 wt.% oxygen were investigated using high-resolution characterization techniques. After 500 h exposure, both steels developed protective oxide scales. After 1700 h, solution-annealed steel exhibited dissolution corrosion pits, because Cr and Al in fine grains formed by recrystallization of the surface-grinding subsurface were depleted, forming internal (Cr, Al)2O3 nodules that caused the initially developed oxide scales to exfoliate due to increased local stress. Following cold working, increased dislocations and grain boundaries facilitated replenishment of Cr&Al in the subsurface, maintaining the durability of external (Cr, Al)2O3 scales, preventing dissolution attack.
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Alumina-forming austenitic steel,Lead-bismuth eutectic,Cold working,Oxidation
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要点】:论文通过高分辨率表征技术研究了冷加工对氧化铝形成奥氏体(AFA)钢在含氧铅-铋共晶(LBE)中600°C下的氧化行为影响,发现冷加工通过增加位错和晶界有助于维持氧化层稳定性,防止腐蚀。

方法】:采用高分辨率表征技术对退火和冷加工处理的AFA钢在600°C、10^-6 wt.%氧含量的LBE环境下的氧化行为进行了分析。

实验】:在LBE中暴露500小时后,两种钢均形成了保护性氧化层;暴露1700小时后,退火处理的钢出现溶解腐蚀坑,而冷加工处理的钢通过增加的位错和晶界保持氧化层的稳定性。实验使用的数据集名称未在文本中明确提及,但实验结果展示了两种不同处理方式对氧化行为的影响。