Low-temperature oxy-nitriding of 316 L austenitic stainless steel for improved corrosion resistance in liquid lead-bismuth eutectic

SCRIPTA MATERIALIA

卷:202

Article

Chen, Guang¹  Wang, Jun¹  Zhang, Hongtao²  Li, Longyi¹  Fan, Hongyuan¹ 

[1] Sichuan Univ, Sch Mech Engn, Chengdu 610065, Sichuan, Peoples R China

[2] Loughborough Univ, Dept Mat, Loughborough LE11 3TU, Leics, England

关键词: 316 L austenitic stainless steel;    Low-temperature oxy-nitriding;    Lead-bismuth eutectic;    Dissolution corrosion;   

DOI  :  10.1016/j.scriptamat.2021.114014

来源: Elsevier

【 摘 要 】

The effects of low-temperature oxy-nitriding (LTON) treatment on the liquid lead-bismuth eutectic (LBE) corrosion behaviors of 316 L ASS were investigated in the stagnant liquid LBE under vacuum at 823 K. Results show that the untreated samples were severely selective leaching in contact with liquid LBE. LTON treatment produced an outer porous Fe-Cr spinel film and inner S phase layer on the sample surface, which transformed into a thicker spinel film containing gamma(low-N) and a region distributed with CrN precipitates after liquid LBE corrosion. This was mainly attributed to the oxidation and decomposition of S phase and inward diffusion of the interstitials, owing to S phase is a metastable phase and is easier to be oxidized than matrix at elevated temperatures. This inspired us that improving the ability to form protective oxide film for materials was maybe a good method to mitigate the liquid LBE corrosion. (C) 2021 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

【 授权许可】

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