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The improvement of cryogenic mechanical properties of Fe-12 Mn and Fe-8 Mn alloy steels through thermal/mechanical treatments

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Abstract

An investigation has been made to improve the low temperature mechanical properties of Fe-8Mn and Fe-12Mn-0.2 Ti alloy steels. A reversion annealing heat treatment in the two-phase (α+ γ) region following cold working has been identified as an effective treatment. In an Fe-12Mn-0.2Ti alloy a promising combination of low temperature (-196°C) fracture toughness and yield strength was obtained by this method. The improvement of properties was attributed to the refinement of grain size and to the introduction of a uniform distribution of retained austenite (γ). It was also shown that an Fe-8Mn steel could be grain-refined by a purely thermal treatment because of its dislocated α martensitic structure and absence of ε martensite. As a result, a significant reduction of ductile to brittle transition temperature was obtained.

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Authors and Affiliations

  1. Brookhaven National Laboratory, Upton, New York

    S. K. Hwang

  2. Materials Science and Mineral Engineering Department, Univerity of California, 94720, Berkeley, CA

    J. W. Morris (Professor of Metallurgy)

Authors
  1. S. K. Hwang
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  2. J. W. Morris
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formerly with the Lawrence Berkeley Laboratory, University of California.

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Hwang, S.K., Morris, J.W. The improvement of cryogenic mechanical properties of Fe-12 Mn and Fe-8 Mn alloy steels through thermal/mechanical treatments. Metall Trans A 10, 545–555 (1979). https://doi.org/10.1007/BF02658317

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  • DOI: https://doi.org/10.1007/BF02658317

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