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Oxidation of Fe–18%Mn–0.6%C Steels in Air and a N 2 –CO 2 –O 2 Mixed Gas Atmosphere at 1273–1473 K
Author(s) -
Lee Dong Bok,
Sohn IlRyong
Publication year - 2012
Publication title -
steel research international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.603
H-Index - 49
eISSN - 1869-344X
pISSN - 1611-3683
DOI - 10.1002/srin.201100323
Subject(s) - spallation , oxide , materials science , chromia , atmosphere (unit) , austenite , metallurgy , internal oxidation , analytical chemistry (journal) , matrix (chemical analysis) , chemistry , microstructure , thermodynamics , composite material , environmental chemistry , physics , neutron , nuclear physics
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%N 2 –10%CO 2 –5%O 2 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, Fe 2 O 3 , and MnFe 2 O 4 were highly susceptible to cracking and spallation due to the severe oxidation condition. Since Mn was consumed to form MnFe 2 O 4 , the original γ‐matrix changed to an α‐matrix in the subscale area, in which Mn‐rich internal oxide precipitates formed locally.