Microstructural Evolution of Pre-oxidized T91 Steel During LBE Dissolution Corrosion

IF 2.1 3区材料科学 Q2 METALLURGY & METALLURGICAL ENGINEERING

Oxidation of Metals Pub Date : 2024-09-19 DOI:10.1007/s11085-024-10309-z

Chao Liu, Tielong Shen, Le Qi, Zhiwei Ma, Hailong Chang, Zhiguang Wang

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Abstract

The microstructural evolution of T91 steel by pre-steam oxidation during liquid lead-bismuth eutectic (LBE) dissolution corrosion was investigated. A bi-layered pre-oxide film with Fe-rich outer layer and Cr-rich inner layer was formed on T91 steel, which was similar to the oxide film of T91 after oxidation corrosion in LBE. The pre-oxide film effectively protects the matrix from LBE corrosion at 620 °C. However, the composition and microstructure of the pre-oxide film changed dramatically. Unlike the original duplex structure, the pre-oxide film exposed to LBE undergoes a process of reduction of the outer layer and oxidative growth of the inner layer and changes into five layers, the loose and easily peeling outer Fe layer, the dense and intact inner layers successively consisting of Fe–Cr spinel layer, a transition layer of matrix and Cr-rich oxide, continuous Cr-rich oxide layer with tetragonal distorted spinel structure and amorphous SiO₂ layer. The evolution mechanism of the pre-oxide film during LBE dissolution corrosion is discussed.

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预氧化 T91 钢在 LBE 溶解腐蚀过程中的微观结构演变

研究了 T91 钢在液态铅铋共晶（LBE）溶解腐蚀过程中通过预氧化作用产生的微观结构演变。在 T91 钢上形成了外层富含铁、内层富含铬的双层预氧化膜，这与 T91 在 LBE 中氧化腐蚀后的氧化膜相似。在 620 °C 下，预氧化膜有效地保护了基体免受 LBE 腐蚀。然而，预氧化膜的成分和微观结构发生了显著变化。与原来的双相结构不同，暴露在 LBE 中的预氧化膜经历了外层还原和内层氧化生长的过程，变为五层，即疏松易剥离的外层铁层、致密完整的内层铁铬尖晶石层、基体和富铬氧化物的过渡层、具有四方扭曲尖晶石结构的连续富铬氧化物层和无定形 SiO2 层。讨论了 LBE 溶解腐蚀过程中预氧化膜的演变机理。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Oxidation of Metals 工程技术-冶金工程

CiteScore

5.10

自引率

9.10%

发文量

审稿时长

2.2 months

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