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

William Mao, Willem G. Sloof

Research output: Contribution to journalArticleScientificpeer-review

6 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)29-32
JournalScripta Materialia
Volume135
DOIs
Publication statusPublished - 2017

Keywords

  • (Mn,Fe)O mixed oxide
  • Composition depth profile
  • Internal oxidation
  • Local thermodynamic equilibrium
  • Mn alloyed steel

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