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Microstructure development during high-velocity deformation

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Abstract

An austenitic stainless steel was deformed at high (103 s−1) strain rates at two levels of strain by electromagnetic forces. Transmission electron microscopy (TEM) studies, X-ray diffraction analysis, and superconducting quantum-interference device (SQUID) measurements show that high strain rates induce the formation of stacking faults and twin structures, enhance the tendency for ɛ-martensite formation, and suppress the amount of α′-martensite. The increased presence of stacking faults and twin structures at high strain rates can be explained by an easy nucleation of partial dislocations at high strain rates and a superior aptitude for partial dislocations to react to high strain rates due to their jump frequency. The suppression of α′-martensite can be explained by the adiabatic heating produced during electromagnetic forming.

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Authors and Affiliations

  1. the Materials Science and Engineering Program, University of Texas at Austin, 78712, Austin, TX

    P. J. Ferreira (Assistant Professor)

  2. the Department of Materials Science and Engineering, Massachusetts Institute of Technology, 02139, Cambridge, MA

    J. B. Vander Sande (Professor)

  3. the Department of Materials Engineering, Instituto Superior Técnico, Lisboa, Portugal

    M. Amaral Fortes (Professor)

  4. Outokumpu Stainless Oy, Tornio, Finland

    A. Kyrolainen (Research Engineer)

Authors
  1. P. J. Ferreira
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  2. J. B. Vander Sande
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  3. M. Amaral Fortes
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  4. A. Kyrolainen
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Ferreira, P.J., Vander Sande, J.B., Fortes, M.A. et al. Microstructure development during high-velocity deformation. Metall Mater Trans A 35, 3091–3101 (2004). https://doi.org/10.1007/s11661-004-0054-3

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  • DOI: https://doi.org/10.1007/s11661-004-0054-3

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