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Characterization of a Cold-Rolled 2101 Lean Duplex Stainless Steel

Published online by Cambridge University Press:  31 May 2013

Paola Bassani ,
Marco Breda ,
Katya Brunelli ,
Istvan Mészáros ,
Francesca Passaretti ,
Michela Zanellato  and
Irene Calliari
Paola Bassani
Affiliation:
CNR-IENI, Unit of Lecco, Corso Promessi Sposi 29, Lecco 23900, Italy
Marco Breda*
Affiliation:
Industrial Engineering Department (DII), University of Padova, Via Marzolo 9, Padova 35131, Italy
Katya Brunelli
Affiliation:
Industrial Engineering Department (DII), University of Padova, Via Marzolo 9, Padova 35131, Italy
Istvan Mészáros
Affiliation:
Budapest University of Technology and Economics (DMSE), H-1111 Budapest, XI, Bertalan L. u. 7. Build., MT-H-1521 Budapest, Hungary
Francesca Passaretti
Affiliation:
CNR-IENI, Unit of Lecco, Corso Promessi Sposi 29, Lecco 23900, Italy
Michela Zanellato
Affiliation:
Industrial Engineering Department (DII), University of Padova, Via Marzolo 9, Padova 35131, Italy
Irene Calliari
Affiliation:
Industrial Engineering Department (DII), University of Padova, Via Marzolo 9, Padova 35131, Italy
*
*Corresponding author. E-mail: marco.breda@studenti.unipd.it
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Abstract

Duplex stainless steels (DSS) may be defined as a category of steels with a two-phase ferritic–austenitic microstructure, which combines good mechanical and corrosion properties. However, these steels can undergo significant microstructural modification as a consequence of either thermo-mechanical treatments (ferrite decomposition, which causes σ- and χ-phase formation and nitride precipitation) or plastic deformation at room temperature [austenite transformation into strain-induced martensite (SIM)]. These secondary phases noticeably affect the properties of DSS, and therefore are of huge industrial interest. In the present work, SIM formation was investigated in a 2101 lean DSS. The material was subjected to cold rolling at various degrees of deformation (from 10 to 80% thickness reduction) and the microstructure developed after plastic deformation was investigated by electron backscattered diffraction, X-ray diffraction measurements, and hardness and magnetic tests. It was observed that SIM formed as a consequence of deformations higher than ~20% and residual austenite was still observed at 80% of thickness reduction. Furthermore, a direct relationship was found between microstructure and magnetic properties.

Keywords

lean duplex stainless steelcold deformationstrain-induced martensiteEBSD investigationmagnetic measurements
Type
Materials Applications
Information
Microscopy and Microanalysis , Volume 19 , Issue 4 , August 2013 , pp. 988 - 995
Copyright
Copyright © Microscopy Society of America 2013 

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