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Tensile deformation behavior of mechanically stabilized Fe-Mn austenite

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Abstract

The tensile deformation behavior of mechanically-stabilized austenite is investigated in Fe-Mn binary alloys. A 30 pct thickness reduction by rolling at 673 K (above the Af temperature) largely suppresses the austenite (γ) to hcp epsilon martensite (ε) transformation in 17Mn and 25Mn steels. However, the deformation behavior of the mechanically stabilized austenite in the two alloys differs significantly. In 25Mn steel, the onset of plastic deformation is due to the stress-induced γ→ ε transformation and results in a positive temperature dependence of the yield strength. The uniform elongation is enhanced by the γ → ε transformation during deformation. In 17Mn steel, bccα′ martensite is deformation-induced along with e and a plateau region similar to Lüders band deformation appears at the beginning of the stress-strain curve. The mechanical stabilization of austenite also suppresses the intergranular fracture of 17Mn steel at low temperatures.

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Authors and Affiliations

  1. Department of Metallurgical Engineering, Ibaraki University, Hitachi, Japan

    Y. Tomota (Associate Professor)

  2. Center for Advanced Materials, Lawrence Berkeley Laboratory, 94720, Berkeley, CA

    M. Strum (Lawrence Livermore National Laboratory and Research Assistant)

  3. Center for Advanced Materials, Lawrence Berkeley Laboratory, University of California, 94720, Berkeley, CA

    J. W. Morris (Professor of Metallurgy, Department of Materials Science and Mineral Engineering, and Program Leader, Structural Materials)

Authors
  1. Y. Tomota
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  2. M. Strum
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  3. J. W. Morris
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M. STRUM, formerly Candidate for Ph.D. at the University of California at Berkeley

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Tomota, Y., Strum, M. & Morris, J.W. Tensile deformation behavior of mechanically stabilized Fe-Mn austenite. Metall Trans A 19, 1563–1568 (1988). https://doi.org/10.1007/BF02674030

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  • DOI: https://doi.org/10.1007/BF02674030

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