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Phase transformation mechanisms occurring during spark plasma sintering elaboration of new duplex composite stainless steels

Article dans une revue avec comité de lecture
Author
MVODO EBA, R.
496957 Laboratoire Interdisciplinaire Carnot de Bourgogne [ICB]
ccARDIGO-BESNARD, Maria-Rosa
496957 Laboratoire Interdisciplinaire Carnot de Bourgogne [ICB]
CHATEAU-CORNU, J.-P.
496957 Laboratoire Interdisciplinaire Carnot de Bourgogne [ICB]
HERBST, F.
496957 Laboratoire Interdisciplinaire Carnot de Bourgogne [ICB]
GEOFFROY, N.
496957 Laboratoire Interdisciplinaire Carnot de Bourgogne [ICB]
BESNARD, Aurélien
127742 Laboratoire Bourguignon des Matériaux et Procédés [LABOMAP]
VANDENABEELE, C.
LUCAS, S.
364917 Université de Namur [Namur] [UNamur]
DESCAMPS-MANDINE, A.
488841 Centre de microcaractérisation Raimond Castaing [Centre Castaing]
JOSSE, C.
488841 Centre de microcaractérisation Raimond Castaing [Centre Castaing]

URI
http://hdl.handle.net/10985/25865
DOI
10.1016/j.matchemphys.2024.129796
Date
2024-08-05
Journal
Materials Chemistry and Physics

Abstract

This study focuses on the elaboration of duplex stainless steels (DSS) from powder mixtures using spark plasma sintering (SPS). Different mass fractions of an austenitic 316L powder and a ferritic 410L one were blended and then sintered by SPS. Microstructural characterizations of the sintered samples obtained from different powder mixtures were performed. They were coupled with marking experiments of the powder particles’ surface. The results showed the formation of martensite within the ferritic powder and at the austenite/ferrite interfaces, following two different mechanisms. In addition, it was found that the width of the martensitic regions is mainly influenced by the diffusion of Cr and Ni from the austenitic to the ferritic powder during sintering. The characterizations revealed that the originality of this approach lies in the particular microstructure obtained after sintering. The characteristic size of the ferritic and austenitic domains in the final material is that of the initial powder particles (up to some hundred microns). Moreover, each domain is formed by equiaxed and isotropic grains, having a size ranging from some microns to some tens of microns. This particular microstructure justifies the use of the term “composite duplex stainless steels” (COMPLEX) for this kind of new DSS.

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