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19. COLD FORMING OF OXIDE DISPERSION STRENGTHENED STEELS

Author

Vakhitova, Elena, Sornin, Denis, Vincent, S., François, Manuel, CEA-Direction des Energies (ex-Direction de l'Energie Nucléaire) (CEA-DES (ex-DEN)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Laboratoire des Systèmes Mécaniques et d'Ingénierie Simultanée (LASMIS), Institut Charles Delaunay (ICD), Université de Technologie de Troyes (UTT)-Centre National de la Recherche Scientifique (CNRS)-Université de Technologie de Troyes (UTT)-Centre National de la Recherche Scientifique (CNRS), and amplexor, amplexor

Subjects
[PHYS.NUCL] Physics [physics]/Nuclear Theory [nucl-th], [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], [PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex], Crystalographic Texture, Cold pilgering, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], ODS steel, Synchrotron
Abstract

International audience; Oxides Dispersed strengthened (ODS) stainless steels are foreseen for fuel cladding tubes in the coming generation of fission sodium cooled nuclear reactors. To achieve better creep performances their body-centered matrix is reinforced by a very fine oxides dispersion. Those grades are currently obtained by Powder Metallurgy (PM). After mechanical alloying with the oxide and the hot extrusion as a rough tube, the material is commonly cold formed (CF) to obtain a cladding tube. Many cold forming techniques has been proposed and among them, the industrial Mannesmann tube pilgering technique is one of the most promising. Using this technique, this study prospects the behavior of the ODS steel during various sequences of cold work and recovery Heat Treatments (HT). The ferritic/martensitic (9wtpercent Cr) structure of the grade induces phase transformation during high temperature heat treatments. Therefore, the way to take advantage of phase transformation to recover better microstructural and mechanical properties is under prospect. The present study focuses on the crystallographic texture evolution during various forming sequences. The microstructure is prospected by Scanning Electronic Microscopy and X-Ray Diffraction including synchrotron facilities. The Mannesmann tube pilgering process gives access to highly (up to 100percent) cold work tubes. Unexpectedly, a texture memory effect is observed for those tubes after heat treatment what was not reported previously. Using synchrotron facilities, in-situ heat treatments reveal the contribution of the process parameters on the occurrence and the intensity of this texture memory effect. Those data are of crucial interest for the design of further industrial cold forming sequences of ODS ferritic/martensitic steel.

Published
2018

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