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Effect of Edges and Corners on Stresses in Thermally Grown Alumina Scales

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Abstract

Residual stress near edges and corners of thermally grown alumina scaleswere investigated. In this study, an edge is the intersection of twoorthogonal flat surfaces and a corner is the intersection of three suchsurfaces. Microfluorescence measurements, performed on alloys withcomposition Fe–28Al–5Cr (at.%, bal. Fe) oxidized at 900°C,showed a large (>50%) reduction in hydrostatic stress in the vicinity ofedges and corners. Surprisingly, significant stress reduction persists outto distances twenty to fifty times the scale thickness from theedge. Finite-element analysis calculations confirm the experimental resultsand provide a considerably more detailed picture of the stress distributionand its components and show that much of the observed stress reduction nearan edge, is due to plastic deformation of the underlying metal.

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Authors and Affiliations

  1. Argonne National Laboratory, Argonne, Illinois, 60439

    D. Renusch, G. Muralidharan, S. Uran, M. Grimsditch & B. W. Veal

  2. Western Michigan University, Kalamazoo, Michigan, 49008

    D. Renusch

  3. Idaho National Engineering Laboratory, Idaho Falls, Idaho, 83415

    J. K. Wright & R. L. Williamson

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  1. D. Renusch
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  2. G. Muralidharan
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  4. M. Grimsditch
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  5. B. W. Veal
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  6. J. K. Wright
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  7. R. L. Williamson
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Renusch, D., Muralidharan, G., Uran, S. et al. Effect of Edges and Corners on Stresses in Thermally Grown Alumina Scales. Oxidation of Metals 53, 171–191 (2000). https://doi.org/10.1023/A:1004543032584

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