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Microstructural modification during isothermal ageing of a low nickel duplex stainless steel

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Abstract

In order to reduce the cost of duplex stainless steel (DSS), the Ni could be partially substituted by Mn and N, to maintain the alpha/gamma microstructure, the corrosion resistance and mechanical strength similar to the common Ni–Cr–Mo DSS. In this paper the microstructure stability, impact strength and the general corrosion behaviour of a low Ni grade, 22Cr–4Mn–0,2N DSS, were examined. In the solution annealing condition the corrosion resistance is quite similar to the austenitic grade. A moderate precipitation of nitrides and carbides was evidenced after isothermal treatment in the range 600–900 °C, while no dangerous topologically close packed phases (TCP-phases) were detected. The precipitation affects the impact strength, which decreases to about 50 J, while the corrosion resistance is less markedly affected.

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Acknowledgements

Acciaierie Valbruna SpA (Vicenza) are thanked for alloy supplying. Research was financially supported by University of Padua, project no. CPDA064495/06.

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Authors and Affiliations

  1. DPCI (Dipartimento di Processi Chimici dell’Ingegneria), University of Padua, Via Marzolo 9, 35131, Padua, Italy

    I. Calliari, K. Brunelli, M. Zanellato & E. Ramous

  2. Acciaierie Valbruna SpA, Vicenza, Italy

    R. Bertelli

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  1. I. Calliari
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  2. K. Brunelli
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  3. M. Zanellato
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  4. E. Ramous
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  5. R. Bertelli
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Correspondence to K. Brunelli.

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Calliari, I., Brunelli, K., Zanellato, M. et al. Microstructural modification during isothermal ageing of a low nickel duplex stainless steel. J Mater Sci 44, 3764–3769 (2009). https://doi.org/10.1007/s10853-009-3505-9

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  • DOI: https://doi.org/10.1007/s10853-009-3505-9

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