Dissolution corrosion of 316L austenitic stainless steels in contact with static liquid lead-bismuth eutectic (LBE) at 500 °C
Dissolution corrosion of 316L austenitic stainless steels in contact with static liquid lead-bismuth eutectic (LBE) at 500 °C
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DOI：
10.1016/j.jnucmat.2017.04.004
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发表时间：
2017-07
影响因子：
3.1
通讯作者：
K. Lambrinou;E. Charalampopoulou;T. Donck;R. Delville;D. Schryvers
中科院分区：
文献类型：
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作者：
K. Lambrinou;E. Charalampopoulou;T. Donck;R. Delville;D. Schryvers
本文研究了316L奥氏体不锈钢的溶解腐蚀行为。为此，将固溶退火和冷变形的316 L钢同时暴露于贫氧（<10−8mass%）静态液态铅铋共晶（LBE）中，在500 °C下持续253-3282 h。腐蚀是一贯更严重的冷拉钢比固溶退火钢，表明钢的热机械状态的重要性。溶解影响区的厚度是不均匀的，偶尔观察到局部增强溶解的位点。LBE溶解侵蚀的进展是由某些钢的微观结构特征（晶界，变形孪晶板条，沉淀物）与溶解腐蚀过程的相互作用促进的。确定的溶解机制是选择性浸出导致钢铁素体化，和非选择性浸出，后者主要是在固溶退火钢中观察到的。最大腐蚀速率随暴露时间的延长而降低，并与溶解侵蚀的深度成反比。
This work addresses the dissolution corrosion behaviour of 316L austenitic stainless steels. For this purpose, solution-annealed and cold-deformed 316L steels were simultaneously exposed to oxygen-poor (<10−8mass%) static liquid lead-bismuth eutectic (LBE) for 253–3282 h at 500 °C. Corrosion was consistently more severe for the cold-drawn steels than the solution-annealed steel, indicating the importance of the steel thermomechanical state. The thickness of the dissolution-affected zone was non-uniform, and sites of locally-enhanced dissolution were occasionally observed. The progress of LBE dissolution attack was promoted by the interplay of certain steel microstructural features (grain boundaries, deformation twin laths, precipitates) with the dissolution corrosion process. The identified dissolution mechanisms were selective leaching leading to steel ferritization, and non-selective leaching; the latter was mainly observed in the solution-annealed steel. The maximum corrosion rate decreased with exposure time and was found to be inversely proportional to the depth of dissolution attack.