TY - JOUR
T1 - Phase transformation mechanisms occurring during spark plasma sintering elaboration of new duplex composite stainless steels
AU - Mvodo Eba, R.
AU - Ardigo-Besnard, M. R.
AU - Chateau-Cornu, J. P.
AU - Herbst, F.
AU - Geoffroy, N.
AU - Besnard, A.
AU - Vandenabeele, C.
AU - Lucas, Stéphane
AU - Descamps-Mandine, A.
AU - Josse, C.
N1 - Publisher Copyright:
© 2024 The Authors
PY - 2024/10/1
Y1 - 2024/10/1
N2 - 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.
AB - 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.
KW - Duplex stainless steels
KW - Phase transformation
KW - Powder metallurgy
KW - Spark plasma sintering
UR - http://www.scopus.com/inward/record.url?scp=85200264458&partnerID=8YFLogxK
U2 - 10.1016/j.matchemphys.2024.129796
DO - 10.1016/j.matchemphys.2024.129796
M3 - Article
AN - SCOPUS:85200264458
SN - 0254-0584
VL - 325
JO - Materials Chemistry and Physics
JF - Materials Chemistry and Physics
M1 - 129796
ER -