Grain-Size Effects on the High-Temperature Oxidation of Modified 304 Austenitic Stainless Steel
- Grain-Size Effects on the High-Temperature Oxidation of Modified 304 Austenitic Stainless Steel
- 김주헌; 김동익; Satyam Suwas; 에릭플러리; 이경우
- Austenitic stainless steel; Grain size effect; Oxidation resistance; Grain boundary
- Issue Date
- Oxidation of metals
- VOL 79, NO 3-4, 239-247
- 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 μm. Similar Σ3 grain boundary fraction was achieved to eliminate any grain-boundary characteristics effect. Samples were oxidized in an air furnace at 700 °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.
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