Oxidation of Fe–18%Mn–0.6%C Steels in Air and a N2–CO2–O2 Mixed Gas Atmosphere at 1273–1473 K |
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Authors: | Dong Bok Lee Il‐Ryong Sohn |
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Affiliation: | 1. School of Advanced Materials Science and Engineering, Sungkyunkwan University, Suwon 440‐746, South Korea;2. POSCO Technical Research Lab., Gwangyang 545‐090, South Korea |
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Abstract: | Austenitic Fe–18 wt% Mn–0.6 wt% C steels were oxidized at 1273, 1373, and 1473 K for up to 2 h in either atmospheric air or an 85%N2–10%CO2–5%O2 gas mixture. The alloys oxidized faster in air than in the mixed gas, but the morphology and composition of the oxide scale formed were similar in both atmospheres. The scales that consisted primarily of FeO, Fe2O3, and MnFe2O4 were highly susceptible to cracking and spallation due to the severe oxidation condition. Since Mn was consumed to form MnFe2O4, the original γ‐matrix changed to an α‐matrix in the subscale area, in which Mn‐rich internal oxide precipitates formed locally. |
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Keywords: | oxidation Fe– Mn alloy manganese oxide scale |
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