Secondary phase precipitation in ultrafine-grained superduplex stainless steels

Secondary phase precipitation in ultrafine-grained superduplex stainless steels

Alisiya Biserova-Tahchieva, Núria Llorca-Isern, Jose Maria Cabrera

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Abstract. Ultrafine-grained S322750 superduplex stainless steel has been obtained through high-pressure torsion (HPT) process. Microstructural evolution after the severe plastic deformation (SPD) has shown no phase transformation. Isothermal heat treatment was applied after the deformation process in order to promote secondary phase precipitation. Precipitation was enhanced in the ultrafine-grained stainless steel in comparison to the coarse-grained stainless steel at the same isothermal heat treatment conditions. Mainly sigma phase and chromium nitrides were found as a product of the local diffusion process. The morphology of the secondary phases has been analyzed by using field emission scanning electron microscopy (FESEM) and transmission electron microscopy (TEM).

Duplex Stainless Steel, HPT, Severe Plastic Deformation, Secondary Phases

Published online , 7 pages
Copyright © 2023 by the author(s)
Published under license by Materials Research Forum LLC., Millersville PA, USA

Citation: Alisiya Biserova-Tahchieva, Núria Llorca-Isern, Jose Maria Cabrera, Secondary phase precipitation in ultrafine-grained superduplex stainless steels, Materials Research Proceedings, Vol. 32, pp 220-226, 2023


The article was published as article 25 of the book Superplasticity in Advanced Materials

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