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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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