Characterization and corrosion behavior of Al-added high Mn ODS austenitic steels in oxygen-saturated lead-bismuth eutectic

Haoran, W.*; Yu, H.*; Liu, J.*; Kondo, Sosuke*; Okubo, Nariaki ; Kasada, Ryuta*

The corrosion behavior of newly developed Al $_{2}$ O $_{3}$ forming high Mn oxide dispersion strengthened (ODS) austenitic steels was examined in oxygen-saturated lead-bismuth eutectic at 450 $^{circ}$ C for 430 h. Compared with non-ODS steels, the ODS steels possessed superior resistance to corrosion and spallation. The high density grain boundaries in the ODS steels acted as channels for the rapid outward diffusion of metallic elements, forming an internal continuous Cr $_{2}$ O $_{3}$ scale at the original surface. Accelerated Al diffusion, along with oxidation prevention by the external (Fe, Mn) oxide scale and the internal Cr $_{2}$ O $_{3}$ scale, jointly resulted in the formation of a continuous Al-rich oxide scale in ODS-7Al steel, contributing to its superior corrosion resistance.

Language	:	English
Journal	:	Corrosion Science
Volume	:	209
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Pages	:	p.110818_1 - 110818_12
Publication Year/Month	:	2022/12
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Paper URL	:	https://doi.org/10.1016/j.corsci.2022.110818
DOI for research data	:	https://doi.org/10.1016/j.corsci.2022.110818
Keywords	:	ADS; ODS; 腐食挙動
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Registration No. : AA20210384
JAEA Abstracts No. : 51000557
Paper Submission No. : 26489

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