Metals and materials international

The Korean Institute of Metals and Materials (대한금속재료학회)
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Effect of Deformation Induced Transformation of ${\epsilon}$-Martensite on Ductility Enhancement in a Fe-12 Mn Steel at Cryogenic Temperatures

  • Received : 2013.07.10
  • Accepted : 2013.07.11
  • Published : 2014.01.20
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Abstract

Metastable ${\epsilon}$-martensite $({\varepsilon}-Ms)$ formed during a prior heat treatment of Fe-12Mn steel has been reported to transform into ${\alpha}-Ms$ during subsequent inelastic deformation. This deformation induced phase transformation (DIPT) from ${\varepsilon}-Ms$ to ${\alpha}-Ms$ has been investigated in the present study within the framework of kinetics relation proposed based upon an internal variable theory of inelastic deformation. The ${\varepsilon}-Ms$ phase was found to become more stable at lower temperatures to provide more prolonged DIPT from ${\varepsilon}-Ms$ to ${\alpha}-Ms$ during an inelastic deformation at cryogenic temperatures, contrary to the case of austenite phase in various transformation induced plasticity steels being more stable at higher temperatures. This reversed stability-temperature relationship in Fe-12Mn steel appeared to provide a significant ductility enhancement at lower temperatures as well as significant strengthening effect.

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