CEA developments of new ferritic ODS alloys for nuclear applications

Carlan, Y. de; Béchade, Jean-Luc; Dubuisson, Philippe; Seran, Jean-Louis; Billot, P.; Bougault, Annick; Cozzika, T.; Doriot, Sylvie; Hamon, Didier; Henry, J.; Ratti, M. G.; Lochet, N.; Nunes, Daniela; Olier, P.; Leblond, T.; Mathon, Marie Hélène

doi:10.1016/j.jnucmat.2008.12.156

Cited by 135 publications

(58 citation statements)

References 10 publications

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“…Research works performed during recent years have revealed that ODS (Oxide Dispersion Strengthened) steels are promising materials for fuel pin cladding in Sodium Fast Reactors [1,2]. It appears that the bcc ferritic-martensitic lattice allows for a high resistance to irradiation swelling up to a dose of around 150 displacements per atom (dpa) and nano-oxides significantly improve creep and tensile properties at high temperature (650°C) by blocking the dislocations motion.…”

Section: Introductionmentioning

confidence: 99%

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

Hary

Guilbert

Wident

et al. 2016

EPJ Nuclear Sci. Technol.

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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 microstructures exhibit more similar yield strengths. It also appeared that decarburisation during heat treatment in the dilatometer induces a decrease in the mechanical properties and heterogeneities in the dual-phase microstructure. This has been addressed by proposing a treatment with a much shorter time in the austenitic domain. Thereafter, the relaxation of macroscopic residual stresses inside the tube during the heat treatment was evaluated. They appear to decrease linearly with increasing temperature and the phase transformation has a limited effect on the relaxation.

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Section: Introductionmentioning

confidence: 99%

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

Hary

Guilbert

Wident

et al. 2016

EPJ Nuclear Sci. Technol.

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“…ODS steels are commonly prepared by high-energy mechanical alloying (MA) of a mixture of steel powder and Y 2 O 3 particles followed by a consolidation stage consisting of hot isostatic pressing (HIP) or hot extrusion (HE) [11,12]. The samples are then submitted to annealing around 1100 • C for 1-2 h. In the last years the attention has been focused on Spark Plasma Sintering (SPS), a novel pressure assisted consolidation technology characterized by high heating rate, low sintering temperature, and short isothermal time at sintering temperature [13,14].…”

Section: Introductionmentioning

confidence: 99%

Mechanical Characterization of a Nano-ODS Steel Prepared by Low-Energy Mechanical Alloying

Sanctis

Fava

Lovicu

et al. 2017

Metals

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An oxide dispersion strengthened (ODS) ferritic steel with nanometric grain size has been produced by low-energy mechanical alloying (MA) of steel powder (Fe-14Cr-1W-0.4Ti) mixed with Y 2 O 3 particles (0.3 wt %) and successive hot extrusion (HE). The material exhibits superior mechanical properties with respect to the unreinforced steel up to 400 • C; then such differences tend to progressively decrease and at 700 • C yield stress (YS) and ultimate tensile strength (UTS) values are very close. The microstructure and mechanical behaviour have been compared with those of ODS steels prepared by the most common process, high-energy MA, consolidation through hot isostatic pressing (HIP) or hot extrusion (HE), annealing around 1100 • C for 1-2 h. The main strengthening mechanisms have been examined and discussed to explain the different behaviour. In addition, heat treatments in the range 1050-1150 • C were carried out and a microstructural evolution with a relevant hardness decrease has been observed. TEM observations evidenced defect recovery and partial grain coarsening owing to the not perfectly homogeneous distribution of oxide particles.

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“…Oxide dispersion strengthened (ODS) Ferritic steels (12-18 wt%Cr) offer great potential as fuel cladding in sodium-cooled fast reactors (SFR) [1][2][3]. Compared with austenitic steels, they exhibit an excellent resistance to swelling under irradiation thanks to their bcc structure [4].…”

Section: Introductionmentioning

confidence: 99%

Microstructural characterizations of 14Cr ODS ferritic steels subjected to hot torsion

Karch

Sornin

Barcelo

et al. 2015

Journal of Nuclear Materials

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CEA developments of new ferritic ODS alloys for nuclear applications

Cited by 135 publications

References 10 publications

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

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

Mechanical Characterization of a Nano-ODS Steel Prepared by Low-Energy Mechanical Alloying

Microstructural characterizations of 14Cr ODS ferritic steels subjected to hot torsion

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