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Analysis of the Plasticity-Enhancing Mechanisms in 12 pctMn Austeno-ferritic Steel by In Situ Neutron Diffraction

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Abstract

The tensile behavior of ductile ultra-high strength Fe-12 pctMn-0.3 pctC-2 pctAl austeno-ferritic steel was studied by in situ neutron diffraction measurement of the elastic lattice strains, dislocation density, stacking fault probability, and strain-induced transformation kinetics. Micro-yielding was observed in austenite, and the plastic deformation of ferrite remained very limited throughout the deformation. The analysis identified three contributions to the strain hardening: twinning-induced plasticity, transformation-induced plasticity, and the accumulation of a high density of geometrically necessary dislocations accommodating the strain mismatch at the phase boundaries.

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Authors and Affiliations

  1. Graduate Institute of Ferrous Metallurgy, Pohang University of Science and Technology, Pohang, South Korea

    Sangwon Lee (Graduate Student) & Bruno C. De Cooman (Professor, Director)

  2. Korea Atomic Energy Research Institute, Daejeon, South Korea

    Wanchuck Woo (Senior Researcher)

  3. Materials Design Laboratory, Pohang University of Science and Technology, Pohang, South Korea

    Bruno C. De Cooman (Professor, Director)

Authors
  1. Sangwon Lee
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  2. Wanchuck Woo
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  3. Bruno C. De Cooman
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Corresponding author

Correspondence to Bruno C. De Cooman.

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Manuscript submitted July 10, 2014.

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Lee, S., Woo, W. & De Cooman, B.C. Analysis of the Plasticity-Enhancing Mechanisms in 12 pctMn Austeno-ferritic Steel by In Situ Neutron Diffraction. Metall Mater Trans A 45, 5823–5828 (2014). https://doi.org/10.1007/s11661-014-2593-6

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  • DOI: https://doi.org/10.1007/s11661-014-2593-6

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