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Effect of High Tensile Strain Rate on the Evolution of Microstructure in Fe-Mn-C-Al Twinning-Induced Plasticity (TWIP) Steel

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Abstract

Fe-17.8Mn-0.52C-0.5Al TWIP steel has been investigated under high-strain rate conditions. Twinning along with stacking faults and high dislocation densities in the austenite matrix has been evaluated by X-ray diffraction line profile analysis and transmission electron microscopy. The samples strained at 100 s−1 show a gradient in the evolution of the dislocation density along the gage length except the fracture end where the density shows a decrease. In case of the samples strained at 1 s−1, the evolution of density shows attainment of a near-saturation stage. Electron backscatter diffraction analysis shows that the decrease in the dislocation density as well as near-saturation stage is due to dynamic recovery as well as dynamic recrystallization at region near the fracture end. The dynamically recrystallized grains are related to the deformed matrix through twin relationship.

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Authors (TD and SGC) are grateful to Indian Academy of Sciences, Bangalore for their support through Summer Fellowship as well as AvH Foundation, Germany, respectively. Authors (TD and SGC) acknowledge Prof. Tamas Ungar, Hungary for constant discussion during the evaluation of dislocation density. The authors KD and WB thank the DFG (Deutsche Forschungsgemeinschaft) for financial support within the collaborative research centre SFB 761.

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Authors and Affiliations

  1. CSIR-National Metallurgical Laboratory, Jamshedpur, 831007, India

    Tuhin Das & Supriya Bera

  2. Department of Materials Engineering, McGill University, Montreal, Canada

    Tuhin Das

  3. National Institute of Technology Durgapur, Durgapur, 713209, WB, India

    Tuhin Das

  4. R&D Division, TATA Steel India, Jamshedpur, 831001, India

    Rajib Saha

  5. Department of Metallurgical Engineering, National Institute of Technology Durgapur, Durgapur, India

    Supriya Bera

  6. Department of Ferrous Metallurgy, IEHK, RWTH Aachen University, 52056, Aachen, Germany

    Kirsten Dahmen & Wolfgang Bleck

  7. Materials Science and Technology, CSIR-National Metallurgical Laboratory, Jamshedpur, India

    Mainak Ghosh & Sandip Ghosh Chowdhury

  8. Development and Technology Division (RD&T), Swindon Technology Centre, Tata Steel Europe, Moorgate, Rotherham, S60 3AR, UK

    Arunansu Haldar

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  1. Tuhin Das
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  2. Rajib Saha
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  3. Supriya Bera
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Corresponding author

Correspondence to Sandip Ghosh Chowdhury.

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Manuscript submitted August 15, 2014.

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Das, T., Saha, R., Bera, S. et al. Effect of High Tensile Strain Rate on the Evolution of Microstructure in Fe-Mn-C-Al Twinning-Induced Plasticity (TWIP) Steel. Metall Mater Trans A 46, 6–11 (2015). https://doi.org/10.1007/s11661-014-2654-x

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  • DOI: https://doi.org/10.1007/s11661-014-2654-x

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