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Surface modification of an austenitic stainless steel wire by a multi-pulse treatment with a high-power electric current

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Abstract

The skin effect caused by high-power electric pulses can be used for modification of the surface microstructure in metallic materials. The electric current pulses of high amplitude and short rapid surface heating followed by melting and rapid solidification due to heat exchange with the bulk. New high-current multi-pulse equipment was engineered and used for the surface modification of a stainless steel. The microstructure was investigated by transmission electron microscopy as a function of the distance from the surface. Rapid surface heating and high cooling rate caused drastic changes in the initial austenitic structure, amorphization of the surface layer and pronounced mechanical twinning in the subsurface region.

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Acknowledgements

Financial support of this study by the German Research Foundation (DFG) under contract GE 2673/2-1 “Effects of High Current Density Impulses on the Properties and Microstructure of Nickelbase Superalloys” is gratefully acknowledged.

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Authors and Affiliations

  1. Institut für Werkstoffkunde (Materials Science), Leibniz Universität Hannover, An der Universität 2, 30823, Garbsen, Germany

    F. Nürnberger, G. Gerstein, A. Dalinger, S. E. Thürer & H. J. Maier

  2. Institut für Physikalische Chemie und Elektrochemie, Leibniz Universität Hannover, Callinstr. 3A, 30167, Hannover, Germany

    A. Feldhoff

  3. Department of Engineering Design and Materials, Norwegian University of Science and Technology – NTNU, 7491, Trondheim, Norway

    A. Vinogradov

Authors
  1. F. Nürnberger
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  2. G. Gerstein
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  3. A. Dalinger
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  4. S. E. Thürer
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  5. A. Vinogradov
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  6. A. Feldhoff
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  7. H. J. Maier
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Corresponding author

Correspondence to G. Gerstein.

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Nürnberger, F., Gerstein, G., Dalinger, A. et al. Surface modification of an austenitic stainless steel wire by a multi-pulse treatment with a high-power electric current. J Mater Sci 52, 8007–8015 (2017). https://doi.org/10.1007/s10853-017-1003-z

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  • DOI: https://doi.org/10.1007/s10853-017-1003-z

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