Grain-Size Effects on the High-Temperature Oxidation of Modified 304 Austenitic Stainless Steel

Kim, Ju-Heon and Kim, Dong-Ik and Suwas, Satyam and Fleury, Eric and Yi, Kyung-Woo (2013) Grain-Size Effects on the High-Temperature Oxidation of Modified 304 Austenitic Stainless Steel. In: OXIDATION OF METALS, 79 (3-4, S). pp. 239-247.

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Abstract

The high-temperature oxidation behavior of modified 304 austenitic stainless steels in a water vapor atmosphere was investigated. Samples were prepared by various thermo mechanical treatments to result in different grain sizes in the range 8-30 mu m. Similar I 3 pound grain boundary fraction was achieved to eliminate any grain-boundary characteristics effect. Samples were oxidized in an air furnace at 700 A degrees C with 20 % water vapor atmosphere. On the fine-grained sample, a uniform Cr2O3 layer was formed, which increased the overall oxidation resistance. Whereas on the coarse-grained sample, an additional Fe2O3 layer formed on the Cr-rich oxide layer, which resulted in a relatively high oxidation rate. In the fine-grained sample, grain boundaries act as rapid diffusion paths for Cr and provided enough Cr to form Cr2O3 oxide on the entire sample surface.

Item Type:	Journal Article
Publication:	OXIDATION OF METALS
Publisher:	SPRINGER/PLENUM PUBLISHERS
Additional Information:	Copyright for this article belongs to the SPRINGER/PLENUM PUBLISHERS, USA.
Keywords:	Austenitic stainless steel; Grain size effect; Oxidation resistance; Grain boundary
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	23 Apr 2013 05:27
Last Modified:	23 Apr 2013 05:27
URI:	http://eprints.iisc.ac.in/id/eprint/46430

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