Modelling of temperature-dependent growth kinetics of oxide scale on hot-rolled steel strip

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Journal Article
Advanced Science Letters, 2012, 13 pp. 219 - 223
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A numerical simulation, developed to predict the temperature distribution and calculate the growth rate of the oxide scale formed on the microalloyed low carbon steel during the laminar cooling of hot strip rolling, was conducted by two-dimensional finite element method. The model takes into account the different thermophysical properties of the multilayered oxide scales and the film boundary conditions for the water jet impingement zone and the stable film boiling zone through the run-out table. Complied with the parabolic growth of the oxide layers and the distribution of the oxide phase, it is found that the present of wustite (FeO) results in a significant increase of the oxidation rate. However, the parabolic rate constant for the simultaneous growth of the two outer layers of magnetite (Fe 3O 4) and hematite (Fe 2O 3) reduce rapidly compared to that of three-layer oxide scale. The growth rates and temperature gradients predicted by the model can be employed to elucidate the formation mechanism of oxide scales, as well as to analyse oxide scale failure. © 2012 American Scientific Publishers. All rights reserved.
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