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

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Abstract

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.

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Authors and Affiliations

  1. Central Iron and Steel Research Institute, 100081, Beijing, China

    Si-lian Chen (Doctor Candidate), Jun Hu, Han Dong & Wen-quan Cao (Doctor, Professor)

  2. School of Materials Science and Engineering, Huazhong University of Science and Technology, 430074, Wuhan, Hubei, China

    Jun Hu

  3. Danish-Chinese Centre for Nanometals, Section for Materials Science and Advanced Characterization, Department of Wind Energy, Technical University of Denmark, DK-4000, Roskilde, Denmark

    Xiao-dan Zhang

Authors
  1. Si-lian Chen
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  2. Jun Hu
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  3. Xiao-dan Zhang
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  4. Han Dong
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  5. Wen-quan Cao
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Corresponding author

Correspondence to Wen-quan Cao.

Additional information

Foundation Item: Item Sponsored by National Natural Science Foundation of China (51371057, 51261130091); National Basic Research Program of China (2010CB630803); Danish National Research Foundation (DNRF86-5)

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Chen, Sl., Hu, J., Zhang, Xd. et al. High Ductility and Toughness of a Micro-duplex Medium-Mn Steel in a Large Temperature Range from −196 °C to 200 °C. J. Iron Steel Res. Int. 22, 1126–1130 (2015). https://doi.org/10.1016/S1006-706X(15)30122-9

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  • DOI: https://doi.org/10.1016/S1006-706X(15)30122-9

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