Journal of Iron and Steel Research International

, Volume 22, Issue 12, pp 1126–1130 | Cite as

High Ductility and Toughness of a Micro-duplex Medium-Mn Steel in a Large Temperature Range from −196 °C to 200 °C

  • Si-lian Chen
  • Jun Hu
  • Xiao-dan Zhang
  • Han Dong
  • Wen-quan CaoEmail author


A medium-Mn steel (0. 2C5Mn) was processed by intercritical annealing at different temperatures (625 °C and 650 °C). An ultrafine-grained micro-duplex structure consisting of alternating austenite and ferrite laths was developed by austenite reverse transformation (ART) during intercritical annealing after forging and hot rolling. Ultrahigh ductility with a total elongation higher than 30% was achieved in the temperature range from −196 °C to 200 °C, and high impact toughness no less than 200 J at −40 °C was obtained. Based on the analysis of microstructure and mechanical properties, it was found that the enhanced ductility was determined by the phase transformation effect of austenite (TRIP effect), while the delayed ductile to brittle transition was controlled by austenite stability.

Key words

high strength high ductility intercritical annealing medium-Mn steel ultrafine grain size 


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Copyright information

© China Iron and Steel Research Institute Group 2015

Authors and Affiliations

  • Si-lian Chen
    • 1
  • Jun Hu
    • 1
    • 2
  • Xiao-dan Zhang
    • 3
  • Han Dong
    • 1
  • Wen-quan Cao
    • 1
    Email author
  1. 1.Central Iron and Steel Research InstituteBeijingChina
  2. 2.School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan, HubeiChina
  3. 3.Danish-Chinese Centre for Nanometals, Section for Materials Science and Advanced Characterization, Department of Wind EnergyTechnical University of DenmarkRoskildeDenmark

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