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

Authors
Kim, Ju-HeonKim, Dong-IkSuwas, SatyamFleury, EricYi, Kyung-Woo
Issue Date
2013-04
Publisher
SPRINGER/PLENUM PUBLISHERS
Citation
OXIDATION OF METALS, v.79, no.3-4, pp.239 - 247
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.
Keywords
CHROMIUM DIFFUSION; 304-STAINLESS-STEEL; RESISTANCE; KINETICS; OXIDES; CR2O3; CHROMIUM DIFFUSION; 304-STAINLESS-STEEL; RESISTANCE; KINETICS; OXIDES; CR2O3; Austenitic stainless steel; Grain size effect; Oxidation resistance; Grain boundary
ISSN
0030-770X
URI
https://pubs.kist.re.kr/handle/201004/128219
DOI
10.1007/s11085-012-9347-x
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KIST Article > 2013
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