Journal
SCRIPTA MATERIALIA
Volume 135, Issue -, Pages 29-32Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2017.03.009
Keywords
Mn alloyed steel; Internal oxidation; (Mn1-x,Fe-x)O mixed oxide; Composition depth profile; Local thermodynamic equilibrium
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Funding
- International Zinc Association (IZA)
- Materials innovation institute (M2i) [M223.11439]
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An internal oxidation zone with (Mn1-x,Fe-x)O mixed oxide precipitates occurs after annealing a Fe -1.7 at% Mn steel at 950 degrees C in N-2 plus 5 vol% H-2 gas mixture with dew point of 10 degrees C. Local thermodynamic equilibrium in the internal oxidation zone is established during annealing of the Mn alloyed steel. As a result, the composition of (Mn1-x,Fe-x)O precipitates depends on the local oxygen activity. The oxygen activity decreases as a function of depth below steel surface, and consequently the concentration of Fe decreases in the (Mn1-x,Fe-x)O precipitates. (C) 2017 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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