Modelling High Temperature Oxidation in Iron–Chromium Systems: Combined Kinetic and Thermodynamic Calculation of the Long-Term Behaviour and Experimental Verification
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The oxidation of two industrial steels with different chromium content (9 and 12 wt%), oxidised for up to 120 h at 750 °C in air has been investigated experimentally and by means of two-dimensional theoretical methods. The numerical model approach, which we call Applied Simulations of Thermodynamic Reactions and Interphase Diffusion (ASTRID), links the thermodynamic library ChemApp (GTT-Technologies, Germany) to the numerical programme COMSOL (COMSOL Inc., USA). This allows convenient implementations of complex geometries and to probe the oxidation behaviour in “real-life” microstructures under given conditions. Satisfying agreements with experimental findings for the total oxidation depth and local oxide composition have been obtained. Enhancements in the computing speed, as compared to the initial programme InCorr, enable a better resolution of the spatial phase distribution and allow the consideration of different diffusion coefficients corresponding to the newly formed (oxide) phases within the same calculation time.
KeywordsHigh-temperature oxidation Chromium steels Thermodynamic modelling Diffusion High-diffusivity paths
The authors M. Auinger and M. Rohwerder gratefully acknowledge the funding by the Christian Doppler Forschungsgesellschaft and the voestalpine Stahl GmbH as part of the project “Diffusion and Segregation Mechanisms during Production of High Strength Steel Sheet”.
- 1.D. Young, High Temperature Oxidation and Corrosion of Metals, 1st edn. (Elsevier, Oxford, 2008).Google Scholar
- 2.P. Kofstad, High Temperature Oxidation of Metals (John Wiley & Sons, New York, 1966).Google Scholar
- 3.W. J. Quadakkers, J. Żurek, and M. Hänsel, Journal of Metals 61, 44 (2009).Google Scholar
- 10.U. Krupp and H. J. Christ, Journal of Phase Equilibria and Diffusion 26, 487 (2005).Google Scholar
- 12.I. Kaur, Y. Mishin, and W. Gust, Fundamentals of Grain and Interphase Boundary Diffusion, 3rd edn. (John Wiley & Sons LTD, New York, 1995).Google Scholar
- 13.H. Mehrer, Landolt Börnstein—Numerical Data and Functional Relationships in Science and Technology: Group III, Vol. 26 (Springer, Berlin, 1990).Google Scholar
- 14.S. Yamaguchi and M. Someno, Transactions of the Japan Institute of Metals 23, 259 (1982).Google Scholar
- 17.L. Himmel, R. T. Mehl, and C. E. Birchenall, Journal of Metals 5, 827 (1953).Google Scholar