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Quantitative µ-CT Analysis of Scale Topology Formed During Oxidation of High SiMo Cast Iron

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Abstract

High SiMo cast iron components in automotive exhaust systems are exposed to high-temperature oxidation over time. Quantitative analysis of formed oxide scale is therefore important for the assessment of a component durability. The brittle nature of multilayered scale and thermal stress limits capture of a true topology using traditional 2D destructive cut and polish methods. In this study, nondestructive high spatial-resolution 3D µCT analysis was performed on 2.90-mm-diameter oxidized specimens which permitted direct observation with 3.5 µm pixel resolution. The specimens were oxidized in three sequential time steps for a total 100 h at 700 °C and 800 °C in air and combustion gas atmospheres. A MATLAB-coded algorithm was used to quantify the topology, thickness variation in internal and external scale layers, and scale/metal interface unevenness. Scale topology was linked to oxidation temperature and gas atmosphere. A water vapor environment increases scale/metal interface unevenness and scale layer thickness irregularity which were related to an accelerated oxidation rate.

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Acknowledgement

This material is based upon work supported by the U.S. Department of Energy’s Office of Energy Efficiency and Renewable Energy (EERE) under the Award Number DE-EE0008458. The X-ray Microanalysis Core was supported by NSF EAR IF #1636643.

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Authors and Affiliations

  1. Missouri University of Science and Technology, Rolla, MO, 65409, USA

    Simon N. Lekakh, Wesley Tucker & Asebi Bofah

  2. X-Ray Microanalysis Core, University of Missouri, Columbia, MO, 65211, USA

    Tara Selly

  3. Department of Geological Sciences, University of Missouri, Columbia, MO, 65211, USA

    Tara Selly

  4. Research and Innovation Center, Ford Motor Company, Dearborn, MI, 48124, USA

    Tara Godlewski & Mei Li

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  1. Simon N. Lekakh
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  2. Wesley Tucker
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Correspondence to Simon N. Lekakh.

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Lekakh, S.N., Tucker, W., Bofah, A. et al. Quantitative µ-CT Analysis of Scale Topology Formed During Oxidation of High SiMo Cast Iron. Oxid Met 94, 251–264 (2020). https://doi.org/10.1007/s11085-020-09989-0

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  • DOI: https://doi.org/10.1007/s11085-020-09989-0

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