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New insights into the effects of surface nanocrystallization on the oxidation of 321 austenitic stainless steel in a humid oxygen environment at 1000 °C.

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Title: New insights into the effects of surface nanocrystallization on the oxidation of 321 austenitic stainless steel in a humid oxygen environment at 1000 °C.
Authors: Pour-Ali, Sadegh1, Kiani-Rashid, Ali-Reza1, Babakhani, Abolfazl1, Norouzi, Mohsen2, Virtanen, Sannakaisa1,3 virtanen@ww.uni-erlangen.de
Source: Corrosion Science. Feb2019, Vol. 147, p231-245. 15p.
Subjects: Austenitic stainless steel, Electrolytic oxidation, Nanocrystals, Diffusion, Vaporization, Polycrystals
Abstract: Graphical abstract Highlights • Effects of SNC on the oxidation behaviour of 321ASS were investigated. • SNC process significantly enhanced the diffusion of Cr and Mn. • Cr-vaporization remarkably affected by the SNC process. • The thickness and thickness uniformity of oxide layers were affected by SNC. • Schematic models were developed to describe the oxidation mechanisms. Abstract Oxidation behaviour of surface nanocrystallized 321 austenitic stainless steel (SN–321ASS) and its conventional polycrystalline counterpart (CP–321ASS) in O 2 + 10% H 2 O at 1000 °C was comparatively investigated. Uniform dense distribution of high diffusivity paths on the SN-321ASS greatly enhances the Cr and Mn diffusion throughout the oxidation front. Consequently: (i) formation of a thicker Cr-rich inner oxide layer on the SN–321ASS leads to a superior oxidation resistance, (ii) formation of Mn-rich spinel oxide as a uniform intermediate layer interrupts the easy access of oxygen and/or water to the Cr-rich inner oxide layer, thereby reducing the Cr-vaporization. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
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Abstract:Graphical abstract Highlights • Effects of SNC on the oxidation behaviour of 321ASS were investigated. • SNC process significantly enhanced the diffusion of Cr and Mn. • Cr-vaporization remarkably affected by the SNC process. • The thickness and thickness uniformity of oxide layers were affected by SNC. • Schematic models were developed to describe the oxidation mechanisms. Abstract Oxidation behaviour of surface nanocrystallized 321 austenitic stainless steel (SN–321ASS) and its conventional polycrystalline counterpart (CP–321ASS) in O 2 + 10% H 2 O at 1000 °C was comparatively investigated. Uniform dense distribution of high diffusivity paths on the SN-321ASS greatly enhances the Cr and Mn diffusion throughout the oxidation front. Consequently: (i) formation of a thicker Cr-rich inner oxide layer on the SN–321ASS leads to a superior oxidation resistance, (ii) formation of Mn-rich spinel oxide as a uniform intermediate layer interrupts the easy access of oxygen and/or water to the Cr-rich inner oxide layer, thereby reducing the Cr-vaporization. [ABSTRACT FROM AUTHOR]
ISSN:0010938X
DOI:10.1016/j.corsci.2018.11.024