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Dilatometric Analysis of Anisotropic Dimensional Changes in a 16 Pct Cr Stainless Steel with a Planar Banded Structure

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Abstract

Anisotropic dimensional changes in a 16 pct Cr ferritic stainless steel possessing a banded structure of α + α′ obtained by hot rolling were studied. Considerable anisotropic transformation plasticity was observed during both the austenitization and the martensite formation reactions. Anisotropy was also observed in the case of the coefficient of thermal expansion (CTE), over a wide annealing temperature range. The observations are shown to be due to the geometrical arrangement of the phases, with ferrite acting as a constraint against the in-rolling-plane straining of the pancaked γ, thus encouraging exaggerated dimensional changes along the normal direction (ND). Assuming isotropic dimensional change within the rolling plane and combining the dilatometric results in the rolling and normal directions (NDs), the measured dilatation and CTE can be used to determine the volume fraction of α′. This alternative phase analysis method is shown to have advantages compared to a conventional image analysis method especially at low annealing temperatures where there are still residues of the tempered martensite.

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Authors and Affiliations

  1. Materials Design Laboratory, Graduate Institute of Ferrous Technology, Pohang University of Science and Technology, Pohang, 790-784, Republic of Korea

    Javad Mola (Ph.D. Student) & Bruno C. De Cooman (Director)

  2. Stainless Steel Research Group, Technical Research Laboratories, POSCO, Pohang, 790-300, Republic of Korea

    Dongchul Chae (Principal Researcher)

Authors
  1. Javad Mola
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  2. Dongchul Chae
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  3. Bruno C. De Cooman
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Correspondence to Bruno C. De Cooman.

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Manuscript submitted November 20, 2009.

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Mola, J., Chae, D. & De Cooman, B.C. Dilatometric Analysis of Anisotropic Dimensional Changes in a 16 Pct Cr Stainless Steel with a Planar Banded Structure. Metall Mater Trans A 41, 1429–1440 (2010). https://doi.org/10.1007/s11661-010-0206-6

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  • DOI: https://doi.org/10.1007/s11661-010-0206-6

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