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The role of grain boundary diffusion in initial selective oxidation kinetics of a manganese-aluminum TRIP steel

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Abstract

Confocal scanning laser microscopy (CSLM) was used in real-time observation of alloy element oxidation of a manganese/aluminum transformation induced plasticity (TRIP) steel. CSLM images reveal a marked role of grain boundaries in the overall initial oxidation kinetics of the alloy and consequently in the morphology of the initial surface oxide. Changing the grain size and the oxidation temperature results in a change in the overall kinetics of selective oxidation and in the importance of oxidation at grain boundaries, respectively. Electron backscattered diffraction mapping was used to characterize the grain boundaries intersecting the surface over an area of the alloy. Subsequent CSLM observation of selective oxidation over the same area allowed quantification of oxidation kinetics as a function of individual grain boundary misorientation.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, Carnegie Mellon University, 15213, Pittsburgh, PA

    Casper Thorning & Seetharaman Sridhar

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  1. Casper Thorning
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  2. Seetharaman Sridhar
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This article is a revised version of the paper printed in the Proceedings of the First International Conference on Diffusion in Solids and Liquids—DSL-2005, Aveiro, Portugal, July 6–8, 2005, Andreas Öchsner, José Grácio and Frédéric Barlat, eds., University of Aveiro, 2005.

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Thorning, C., Sridhar, S. The role of grain boundary diffusion in initial selective oxidation kinetics of a manganese-aluminum TRIP steel. J Phs Eqil and Diff 26, 539–546 (2005). https://doi.org/10.1007/s11669-005-0048-x

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  • DOI: https://doi.org/10.1007/s11669-005-0048-x

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