Effect of severe plastic deformation on microstructure and properties of duplex stainless steel

Effect of severe plastic deformation on microstructure and properties of duplex stainless steel

Claudio Gennari, Luca Pezzato, Nuria Llorca-Isern, Alisiya Biserova-Tahchieva, Irene Calliari

Abstract. The excellent performance of duplex and super duplex stainless steels due to their high corrosion resistance and high mechanical strength is directly related to their austeno-ferritic microstructure. However, these steels may suffer the formation of secondary brittle phases when they reach temperatures between 600°C and 950°C causing catastrophic service failure of components. In order to understand the influence of the mechanical history of the steel, the equal channel angular pressing was applied on UNS S32750 bar samples. ECAP is processed by using a hydraulic press (DE-80). Microstructural characterization was carried out on the severe plastic deformed samples by means of OM, SEM and EBSD. Ultimate tensile strength has improved with a low decreasing of elongation after the first pass. The ECAP process resulted to produce a faster precipitation of secondary phases if compared with the non-ECAP samples.

Keywords
Duplex Stainless Steels, Severe Plastic Deformation, ECAP, Grain Refinement

Published online , 8 pages
Copyright © 2023 by the author(s)
Published under license by Materials Research Forum LLC., Millersville PA, USA

Citation: Claudio Gennari, Luca Pezzato, Nuria Llorca-Isern, Alisiya Biserova-Tahchieva, Irene Calliari, Effect of severe plastic deformation on microstructure and properties of duplex stainless steel, Materials Research Proceedings, Vol. 32, pp 205-212, 2023

DOI: https://doi.org/10.21741/9781644902615-23

The article was published as article 23 of the book Superplasticity in Advanced Materials

Content from this work may be used under the terms of the Creative Commons Attribution 3.0 license. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.

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