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Variation with thermal cycling in microstructure and area specific resistance of a ferritic stainless steel having rough surfaces

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Abstract

Crofer22 APU specimens were prepared by grinding with grit 120 and 400 SiC grinding papers, and were then thermally cycled. The variation in oxidation behavior with thermal cycling was then investigated. Observation of microstructures, measurement of area-specific resistance (ASR), analysis of the atomic percentages of the elements by EDX, and XRD analysis were performed. XRD patterns showed that the (Cr, Mn)3O4 spinel phase grew on the surface of the Crofer22 APU samples ground using grit 120. For the samples ground with grit 400, ASR increased as the number of thermal cycles (n) increased. Plots of ln (ASR/T) vs. 1/T for the samples ground with grit 400 after n = 4, 20, and 40 exhibited good linearity, and the apparent activation energies were between 73.4 kJ/mole and 82.5 kJ/mole.

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Authors and Affiliations

  1. Division of Advanced Materials Engineering, Hydrogen & Fuel Cell Research Center, Engineering Research Institute, Chonbuk National University, Jeonju, 561-756, Korea

    Myoung Youp Song

  2. Department of Chemical Engineering and Materials Science, University of California Irvine, Irvine, CA, 92697-2575, USA

    Daniel R. Mumm

  3. College of Arts and Sciences, Cornell University, 147 Goldwin Smith, Ithaca, NY, 14853, USA

    Jiunn Song

Authors
  1. Myoung Youp Song
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  2. Daniel R. Mumm
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  3. Jiunn Song
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Correspondence to Myoung Youp Song.

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Song, M.Y., Mumm, D.R. & Song, J. Variation with thermal cycling in microstructure and area specific resistance of a ferritic stainless steel having rough surfaces. Electron. Mater. Lett. 9, 201–205 (2013). https://doi.org/10.1007/s13391-012-2115-x

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  • DOI: https://doi.org/10.1007/s13391-012-2115-x

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