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Functionally Graded High-Alloy CrMnNi TRIP Steel Produced by Local Heat Treatment Using High-Energy Electron Beam

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Abstract

Cold-rolled, high-alloy CrMnNi TRIP steel was heat treated by electron beam (EB) treatment. After cold rolling to a deformation degree of 70 pct, the microstructure was mainly martensitic with residual austenite. The aim of the subsequent EB treatment was to improve mechanical properties regarding strength and ductility by grain refinement. The process is influenced by EB-specific parameters, resulting in different temperature-time regimes due to different heating and cooling rates. Grain size gradients over the cross section could not be completely suppressed, but minimized. Investigations included optical microscopy, scanning electron microscopy, hardness measurements, quasi static tensile tests, digital image correlation, and thermography for functionally graded tensile specimens. The local heat treatment was used to set specific tailored properties.

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Acknowledgments

The authors gratefully acknowledge the German Research Foundation (DFG) for the financial support of the Collaborative Research Centre TRIP-Matrix Composites (CRC 799) within subproject A7. The authors thank Mr. U. Heinze (Institute of Metal Forming, TU Bergakademie Freiberg) for cold rolling of the steel plates. Furthermore, the authors appreciate the support of Mr. G. Schade (Institute of Materials Engineering, TU Bergakademie Freiberg) during tensile testing.

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Authors and Affiliations

  1. Institute of Materials Engineering, TU Bergakademie Freiberg, Freiberg, Germany

    D. Heinze, A. Buchwalder, A. Jung, A. Weidner, C. Segel, A. Müller, R. Zenker & H. Biermann

  2. Robert Bosch GmbH, Stuttgart, Germany

    D. Heinze

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  1. D. Heinze
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  2. A. Buchwalder
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  3. A. Jung
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  4. A. Weidner
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  6. A. Müller
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  7. R. Zenker
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  8. H. Biermann
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Correspondence to A. Buchwalder.

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Manuscript submitted August 14, 2014.

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Heinze, D., Buchwalder, A., Jung, A. et al. Functionally Graded High-Alloy CrMnNi TRIP Steel Produced by Local Heat Treatment Using High-Energy Electron Beam. Metall Mater Trans A 47, 123–138 (2016). https://doi.org/10.1007/s11661-015-3017-y

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  • DOI: https://doi.org/10.1007/s11661-015-3017-y

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