Abstract
The origin of the dynamic transition of internal oxides was clarified in Fe‐2.4Mn‐0.4Si‐0.13C‐based steel during decarburization annealing at 1073 K. High dew point with H2 gas leads to the formation of deep decarburized ferrite layers containing grain boundary internal oxides. Microstructural characterization reveals the oxide transition from Mn2SiO4 to α-SiO2 at the tip of the internal oxidation layer and from α-SiO2 to Mn2SiO4 at the middle range of the internal oxidation layer. The dynamic transition between Mn2SiO4 and α-SiO2 is understood by the depletion in Mn contents and change of oxygen content, which change the normalized driving force of both oxides. The study gives a detailed mechanism of internal oxide formation and growth in multi-phase steel during high dew point annealing. Impact statementDuring high dew-point decarburization annealing, the fluctuation of Mn contents affects the driving force to form an internal oxide, resulting in the dynamic transition between Mn2SiO4 and α-SiO2.
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