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Oxidation of Metals, October 2013.
V. A. Lashgari, C. Kwakernaak, W. G. Sloof
Department of Materials Science and Engineering, and Materials Innovation Institute (M2i), Delft University of Technology, Mekelweg 2, 2628 CD, Delft, The Netherlands.
Abstract
The transition from internal to external oxidation of Mn-steels depends on temperature, oxygen partial pressure or dew point and alloy composition. A description for this transition includes, besides the diffusion coefficients of Mn and oxygen, also on the critical volume fraction oxide precipitates. This volume fraction for Mn-steel alloys has been determined experimentally and equals 0.2, whereas usually a value of 0.3 is adopted. A low critical volume fraction oxide implies that the alloy is more prone to external oxidation. Oxidation experiments with 1.7, 3.5 and 7.0 wt% Mn-steel alloys at 950 °C, i.e. in the austenitic region, at different oxygen partial pressure or dew points in the range of −45 to +10 °C showed excellent agreement with the oxidation mode predicted using the data obtained for the diffusivities and critical volume fraction oxide.
