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High Strength and High Ductility of Ultrafine-Grained, Interstitial-Free Steel Produced by ECAE and Annealing

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Abstract

Interstitial-free steel (IF steel) underwent severe plastic deformation by equal-channel angular extrusion/pressing (ECAE/P) to improve its strength, and then it was annealed to achieve a good strength-ductility balance. The coarse-grained microstructure of IF steel was refined down to the submicron level after eight-pass ECAE. The ultrafine-grained (UFG) microstructure with high dislocation density brought about substantially improved strength but limited tensile ductility. The limited ductility was attributed to the small, uniform elongation caused by early plastic instability. The annealing at temperatures below 723 K (450 °C) for 1 hour did not lead to remarkable softening, whereas annealing at temperatures up to 923 K (650 °C) resulted in complete softening depending on the development of recrystallization. Therefore, the temperature of approximately 923 K (650 °C) can be considered as a critical recrystallization temperature for UFG IF steel. The annealing at 873 K (600 °C) for different time intervals resulted in different stress–strain response. Uniform tensile elongation increased at the expense of strength with annealing time intervals. After annealing at 873 K (600 °C) for 60 minutes, the yield strength, tensile strength, uniform elongation, and total elongation were found to be 320 MPa, 485 MPa, 15.1 pct, and 33.7 pct, respectively, showing the better combination of strength and ductility compared with cold-rolled samples.

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Acknowledgments

This study was supported mainly by the Scientific and Technological Research Council of Turkey (TUBITAK) under Grant 107M618 and under 2219-International Postdoctoral Research Scholar Program. This study was also supported partly by Scientific Research Projects of Karadeniz Technical University under Grant 2008.112.003.6. I.K. acknowledges the support from the U.S. National Science Foundation, Division of CMMI, Grant 0900187, and International Materials Institute Program through Grant DMR 08-44082, Office of Specific Programs, Division of Materials Research. H.J.M. acknowledges support by Deutsche Forschungsgemeinschaft. The authors thank Eregli Iron and Steel (ERDEMIR), Inc., Zonguldak, Turkey for their support in kindly supplying the initial materials.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Karadeniz Technical University, 61080, Trabzon, Turkey

    Gencaga Purcek (Associate Professor) & Onur Saray (Ph.D. Student)

  2. Department of Mechanical Engineering, Texas A&M University, College Station, TX, USA

    Ibrahim Karaman (Associate Professor)

  3. Lehrstuhl für Werkstoffkunde, University of Paderborn, 33095, Paderborn, Germany

    Hans J. Maier (Professor)

Authors
  1. Gencaga Purcek
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  2. Onur Saray
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  3. Ibrahim Karaman
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  4. Hans J. Maier
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Correspondence to Gencaga Purcek.

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Manuscript submitted May 18, 2011.

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Purcek, G., Saray, O., Karaman, I. et al. High Strength and High Ductility of Ultrafine-Grained, Interstitial-Free Steel Produced by ECAE and Annealing. Metall Mater Trans A 43, 1884–1894 (2012). https://doi.org/10.1007/s11661-011-1063-7

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  • DOI: https://doi.org/10.1007/s11661-011-1063-7

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