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Ultrafine-Grained Austenitic Stainless Steels X4CrNi18-12 and X8CrMnNi19-6-3 Produced by Accumulative Roll Bonding

Department of Materials Science and Engineering, Institute I: General Materials Properties, Friedrich-Alexander Universität Erlangen-Nürnberg, Martensstr. 5, 91058 Erlangen, Germany
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Academic Editor: Hugo F. Lopez
Metals 2015, 5(2), 730-742; https://doi.org/10.3390/met5020730
Received: 30 March 2015 / Revised: 24 April 2015 / Accepted: 4 May 2015 / Published: 7 May 2015
(This article belongs to the Special Issue Ultrafine-grained Metals)
Austenitic stainless steels X4CrNi18-12 and X8CrMnNi19-6-3 were processed by accumulative roll bonding (ARB). Both materials show an extremely high yield strength of 1.25 GPa accompanied by a satisfactory elongation to failure of up to 14% and a positive strain rate sensitivity after two ARB cycles. The strain-hardening rate of the austenitic steels reveals a stabilization of the stress-strain behavior during tensile testing. Especially for X8CrMnNi19-6-3, which has an elevated manganese content of 6.7 wt.%, necking is prevented up to comparatively high plastic strains. Microstructural investigations showed that the microstructure is separated into ultrafine-grained channel like areas and relatively larger grains where pronounced nano-twinning and martensite formation is observed. View Full-Text
Keywords: accumulative roll bonding (ARB); austenitic steel; ultrafine-grained microstructure; strength; nano-twinning; strain rate sensitivity accumulative roll bonding (ARB); austenitic steel; ultrafine-grained microstructure; strength; nano-twinning; strain rate sensitivity
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Ruppert, M.; Freund, L.P.; Wenzl, T.; Höppel, H.W.; Göken, M. Ultrafine-Grained Austenitic Stainless Steels X4CrNi18-12 and X8CrMnNi19-6-3 Produced by Accumulative Roll Bonding. Metals 2015, 5, 730-742.

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