Relation between oxygen activity gradient in the internal oxidation zone of Mn alloyed steel and the composition of oxide precipitates

Journal article (2017)

Authors

W. Mao Material Innovation Institute (M2i), (OLD) MSE-1
W.G. Sloof (OLD) MSE-1
Research Group
(OLD) MSE-1
Internal oxidation (Mn,Fe)O mixed oxide Composition depth profile Local thermodynamic equilibrium Mn alloyed steel
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Published Date

2017

Language

English

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Research Group

(OLD) MSE-1

Abstract

An internal oxidation zone with (Mn1 − x,Fex)O mixed oxide precipitates occurs after annealing a Fe – 1.7 at.% Mn steel at 950 °C in N2 plus 5 vol% H2 gas mixture with dew point of 10 °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,Fex)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,Fex)O precipitates.