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Investigation of the relationships between mechanical properties and microstructure in a Fe-9%Cr ODS steel

In this paper, a feasibility study concerning the generation of tensile specimens using a quenching dilatometer is presented. The ODS steel investigated contains 9%Cr and exhibits a phase transformation between ferrite and austenite around 870 °C. | Investigation of the relationships between mechanical properties and microstructure in a Fe-9 Cr ODS steel EPJ Nuclear Sci. Technol. 2 7 2016 Nuclear Sciences B. Hary et al. published by EDP Sciences 2016 amp Technologies DOI 10.1051 epjn e2016-50008-7 Available online at http www.epj-n.org REGULAR ARTICLE Investigation of the relationships between mechanical properties and microstructure in a Fe-9 Cr ODS steel Benjamin Hary1 Thomas Guilbert1 Pierre Wident1 Thierry Baudin2 Roland Logé3 and Yann de Carlan1 1 Service de Recherches Métallurgiques Appliquées CEA Saclay 91191 Gif-sur-Yvette Cedex France 2 Institut de Chimie Moléculaire et des Matériaux d Orsay UMR CNRS 8182 SP2M Université Paris-Sud 91405 Orsay Cedex France 3 Laboratoire de Métallurgie Thermomécanique École Polytechnique Fédérale de Lausanne rue de la Maladière 71b CP 526 CH-2002 Neuchâtel Switzerland Received 30 April 2015 Received in final form 7 October 2015 Accepted 12 January 2016 Published online 23 Febraury 2016 Abstract. Ferritic-martensitic Oxide Dispersion Strengthened ODS steels are potential materials for fuel pin cladding in Sodium Fast Reactor SFR and their optimisation is essential for future industrial applications. In this paper a feasibility study concerning the generation of tensile specimens using a quenching dilatometer is presented. The ODS steel investigated contains 9 Cr and exhibits a phase transformation between ferrite and austenite around 870 C. The purpose was to generate different microstructures and to evaluate their tensile properties. Specimens were machined from a cladding tube and underwent controlled heat treatments inside the dilatometer. The microstructures were observed using Electron Backscatter Diffraction EBSD and tensile tests were performed at room temperature and at 650 C. Results show that a tempered martensitic structure is the optimum state for tensile loading at room temperature. At 650 C the strengthening mechanisms that are involved differ and the .