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Dynamic Torsional Deformation Behavior of Ultra-Fine-Grained Dual-Phase Steel Fabricated by Equal Channel Angular Pressing

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Abstract

Dynamic torsional deformation behavior of an ultra-fine-grained dual-phase steel fabricated by equal channel angular pressing (ECAP) was investigated and compared with that of an equal channel angular pressed (ECAPed) ultra-fine-grained low-carbon steel. Tensile and dynamic torsional tests were conducted on these two steels, and the deformed microstructures were observed to investigate the dynamic deformation behavior. The ECAPed low-carbon steel consisted of very fine, elongated ferrite-pearlite grains of 0.5 μm in size, and the ECAPed dual-phase steel consisted of ferrite-martensite grains of 1 μm in size. The dynamic torsional test results indicated that maximum shear stress of the dual-phase steel was lower than that of the conventional steel, but that fracture shear strain was higher in the dual-phase steel. Some adiabatic shear bands were observed at the gage center of the dynamically deformed torsional specimen of the low-carbon steel, but they were not observed in the dual-phase steel because localized deformation was alleviated by the increased strain hardenability. These results suggested that the ECAPed ultra-fine-grained dual-phase steel could be a good way to increase the fracture resistance under dynamic loading as the formation of adiabatic shear bands was reduced or prevented.

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Acknowledgments

This work was supported by the National Research Laboratory Program of the Korea Science and Engineering Foundation (KOSEF) and Grant No. 06K1501-00220 from the Center for Nanostructured Materials Technology under the 21 Century Frontier R&D Programs of the Ministry of Science and Technology, Korea.

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Authors and Affiliations

  1. Eco-Materials Research Center, Korea Institute of Machinery & Materials, Changwon, 641-010, Korea

    Byoungchul Hwang (Senior Researcher)

  2. Center for Advanced Aerospace Materials, Pohang University of Science and Technology, Pohang, 790-784, Korea

    Yang Gon Kim (Research Assistant) & Sunghak Lee (Professor)

  3. Materials Science and Engineering Department, Pohang University of Science and Technology, Pohang, 790-784, Korea

    Sunghak Lee (Professor)

  4. Department of Metallurgy and Materials Science, Hanyang University, Ansan, 425-791, Korea

    Duck Young Hwang (Research Assistant) & Dong Hyuk Shin (Professor)

Authors
  1. Byoungchul Hwang
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  2. Yang Gon Kim
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  3. Sunghak Lee
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  4. Duck Young Hwang
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  5. Dong Hyuk Shin
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Corresponding author

Correspondence to Sunghak Lee.

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Manuscript submitted August 30, 2006.

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Hwang, B., Kim, Y., Lee, S. et al. Dynamic Torsional Deformation Behavior of Ultra-Fine-Grained Dual-Phase Steel Fabricated by Equal Channel Angular Pressing. Metall Mater Trans A 38, 3007–3013 (2007). https://doi.org/10.1007/s11661-007-9348-6

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  • DOI: https://doi.org/10.1007/s11661-007-9348-6

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