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Effect of cold rolling on microstructure and magnetic properties in a metastable lean duplex stainless steel

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Abstract

Microstructural and magnetic properties changes of a metastable ferritic–austenitic stainless steel due to cold rolling were studied together with the possibility to develop a new ferritic–martensitic stainless steel. In order to reduce costs low-Ni content was maintained in the lean duplex stainless steel considered, making it more susceptible to strain-induced martensitic transformation. In this study a practically complete γ → α′ transformation was found for 80% of thickness reduction, resulting a new two-phase ferritic–α′ martensitic stainless steel. To investigate the structural evolution different values of thickness reduction were applied. Light optical and scanning electron microscopy were performed to characterize the morphology and grain refining of the structure after each rolling step. Martensitic transformation and work hardening were detected and analyzed by studying of magnetic properties (saturation magnetic polarization, relative magnetic permeability, coercivity). Additionally, hardness tests were performed. The results highlighted a strong grain refining and increase in martensitic phase and hardness with increasing cold deformation. A direct relationship between microstructure and magnetic properties was revealed. In particular the reciprocal of relative magnetic permeability and the coercivity increased with martensite content and the amount of cold deformation. Therefore, the possible application of magnetic measurements as non-destructive tests to study microstructural evolution during cold rolling was shown for the steel considered.

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Acknowledgements

The authors acknowledge Acciaieria Valbruna S.p.a. for the furniture of the material and G. Fassina for the experimental contribution to this research. This study was partially supported by the Hungarian Research Project OTKA 80173CK.

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Authors and Affiliations

  1. Department of Engineering’s Chemical Processes (DPCI), University of Padova, Via Marzolo 9, 35131, Padova, Italy

    Silvia Baldo

  2. Department of Material Science and Engineering, Budapest University of Technology and Economics (BUTE), Budapest, Hungary

    Istvan Mészáros

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  1. Silvia Baldo
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  2. Istvan Mészáros
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Correspondence to Silvia Baldo.

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Baldo, S., Mészáros, I. Effect of cold rolling on microstructure and magnetic properties in a metastable lean duplex stainless steel. J Mater Sci 45, 5339–5346 (2010). https://doi.org/10.1007/s10853-010-4582-5

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  • DOI: https://doi.org/10.1007/s10853-010-4582-5

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