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Simultaneous Recrystallization and Oxidation Behavior of Mn-Containing IF Steel

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Abstract

The recrystallization and oxidation of a Mn-containing interstitial free (IF) steel were investigated simultaneously using confocal scanning laser microscope (CSLM) under controlled atmosphere of Ar 95% and H2 5% (in volume percent) at different temperatures. It was found that the grain boundary played a significant role in controlling recrystallization and oxidation in overall oxidation kinetics of the steel. The surface morphology was composed of two networks along the original and new grain boundaries respectively, which did not coexist. The grain boundary moved in different directions with different velocities during annealing process. The recrystallization processes were studied by CSLM motion video through observing the moving grain boundary to estimate the time for 50 % recrystallization, and the activation energy for recrystallization was therefore calculated. The oxidation mechanism was discussed through comparison of the fluxes among mass transfer of water vapor, dissociation of water vapor and outward diffusion alloying elements. The results indicated that the oxidation was controlled by the mass transfer from the bulk gas to the surface, or dissociation rate, or outward diffusion of manganese, which depended on the temperature to form a grain boundary ridge or groove.

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Authors and Affiliations

  1. Department of Energy and Resources Engineering, College of Engineering, Peking University, Beijing, 100871, China

    Zuo-tai Zhang (Associate Professor) & Ying-yi Zhang

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  1. Zuo-tai Zhang
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  2. Ying-yi Zhang
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Correspondence to Zuo-tai Zhang.

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Foundation Item: Item Sponsored by National Natural Science Foundation of China (50902003); National Key Technology Research and Development Program in 11th Five-Year Plan of China (2009BAC64B05)

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Zhang, Zt., Zhang, Yy. Simultaneous Recrystallization and Oxidation Behavior of Mn-Containing IF Steel. J. Iron Steel Res. Int. 19, 67–74 (2012). https://doi.org/10.1016/S1006-706X(12)60141-1

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  • DOI: https://doi.org/10.1016/S1006-706X(12)60141-1

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