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Licensed Unlicensed Requires Authentication Published by De Gruyter June 11, 2013

σ-phase morphologies and their effect on mechanical properties of duplex stainless steels

  • Michael Pohl , Oliver Storz and Thomas Glogowski


The aim of the presented study is to investigate the influence of the different σ-phase morphologies on the mechanical, wear and corrosive behaviour of the duplex stainless steel 1.4462 (X2CrNiMoN 22 5 3). Different amounts of σ-phase were precipitated in tensile, impact strength, wear and corrosion samples by annealing at 750 °C, 850 °C and 938 °C. σ-phase shows a detrimental influence on the impact strength and the corrosion behaviour. To a very limited extent it can be used to slightly raise the strength under quasi-static load and to improve the wear resistance. Finally, it can be concluded that σ-phase has more unfavourable influences on the material' behaviour than advantageous ones. Therefore, it should be avoided in duplex stainless steels.

* Correspondence address, Professor Dr.-Ing. Michael Pohl Ruhr-Universität Bochum, Institut für Werkstoffe, Werkstoffprüfung Universitätsstraße 150, 44801 Bochum, Germany Tel.: +0234 32 25905 Fax: +0234 32 14409 E-mail:


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Received: 2008-4-1
Accepted: 2008-7-9
Published Online: 2013-06-11
Published in Print: 2008-10-01

© 2008, Carl Hanser Verlag, München

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