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