Interfacial strained structure and orientation relationships of the nanosized oxide particles deduced from elasticity-driven morphology in oxide dispersion strengthened materials

Ribis, J.; Carlan, Y. de

doi:10.1016/j.actamat.2011.09.042

Cited by 240 publications

(118 citation statements)

References 51 publications

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“…The chemistry of these nano-oxides, as determined from transmission electron microscopy or from atom probe tomography, may vary with the Y/Ti ratio and precipitate size, whereas their crystal structure is most often consistent with that of Y 2 Ti 2 O 7 pyrochlore (e.g. [Klimiankou et al, 2004], [Ribis et al, 2012], [Zhong et al, 2014]). Their coherency with the matrix may control the high resistance against recrystallisation, which leads to a stable grain structure up to more than 1000°C [Zhong et al, 2014].…”

Section: Introductionmentioning

confidence: 99%

Anisotropic intergranular damage development and fracture in a 14Cr ferritic ODS steel under high-temperature tension and creep

Salmon-Legagneur

Vincent

Garnier

et al. 2018

Materials Science and Engineering: A

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This work addresses damage mechanisms at high temperature of a hot extruded 14Cr oxide dispersion strengthened steel rod, in particular, anisotropy induced by its strong morphological and crystallographic texture. Under uniaxial tension, intergranular damage and unstable fracture increased with test temperature; they appeared much easier along the rod axis than perpendicular to it. Creep fracture of smooth specimens involved crack initiation from the side surfaces and intergranular crack propagation, accompanied by intergranular damage.In order to get rid of fracture surface oxidation by the air environment, a methodology promoting crack nucleation from inside the specimen was built. From tensile and creep tests on notched specimens the fracture initiation location and fracture stability were first mapped as a function of test temperature, maximal stress triaxiality and loading direction. Then, for the first time to the authors' knowledge, interrupted tests on notched tensile and creep specimens, followed by low-temperature fracture allowed revealing fracture surfaces formed at high temperature, but unconnected to the external environment. Intergranular fracture and grain boundary grooving were evidenced there, together with strong chemical reactivity at the surface of internal cavities during damage development at high temperature.

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Section: Introductionmentioning

confidence: 99%

Anisotropic intergranular damage development and fracture in a 14Cr ferritic ODS steel under high-temperature tension and creep

Salmon-Legagneur

Vincent

Garnier

et al. 2018

Materials Science and Engineering: A

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“…In the last decade, extensive research has been carried out to determine the crystallographic structure of oxide nanoparticles, and their interface and orientation relationships with the ferritic (i.e. body centred cubic) steel matrix in various ODS steels [3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Oxide nanoparticles in an Al-alloyed oxide dispersion strengthened steel: crystallographic structure and interface with ferrite matrix

Zhang

Pantleon²

2017

Philosophical Magazine

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. Oxide nanoparticles in an Al-alloyed oxide dispersion strengthened steel: crystallographic structure and interface with ferrite matrix. Philosophical Magazine, 97(21), 1824-1846 . DOI: 10.1080/14786435.2017 Oxide nanoparticles in an Al-alloyed oxide dispersion strengthened steel: crystallographic structure and interface with ferrite matrix Oxide nanoparticles are quintessential for ensuring the extraordinary properties of oxide dispersion strengthened (ODS) steels. In this study, the crystallographic structure of oxide nanoparticles, and their interface with the ferritic steel matrix in an Al-alloyed ODS steel, i.e. PM2000, were systematically investigated by high resolution transmission electron microscopy. The majority of oxide nanoparticles were identified to be orthorhombic YAlO3. During hot consolidation and extrusion, they develop a coherent interface and a near cuboidon-cube orientation relationship with the ferrite matrix in the material. After annealing at 1200 C for 1 hour, however, the orientation relationship between the oxide nanoparticles and the matrix becomes arbitrary, and their interface mostly incoherent. Annealing at 1300 C leads to considerable coarsening of oxide nanoparticles, and a new orientation relationship of pseudo-cube-on-cube between oxide nanoparticles and ferrite matrix develops. The reason for the developing interfaces and orientation relationships between oxide nanoparticles and ferrite matrix under different conditions is discussed.

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“…These results could be due to a difference of the coherency between the nano-phases and the matrix. In the 14Cr-ODS bar, nano-phases are coherent with the matrix [17] but in the 9Cr-ODS material, because of the (α) to (γ) phase transformation, this coherency is probably lost as mentioned by Yamamoto [18] and the coarsening resistance is deteriorated [17][18][19]. No coherency of the nano-particles with the matrix was observed.…”

Section: Microstructure Evolutionmentioning

confidence: 94%

Assessment of a new fabrication route for Fe–9Cr–1W ODS cladding tubes

Toualbi

Cayron

Olier

et al. 2012

Journal of Nuclear Materials

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Oxide Dispersion Strengthened ferritic/martensitic steels are developed as future cladding materials for Generation IV Sodium-Cooled Fast Reactors. ODS alloys are elaborated by powder metallurgy, consolidated by hot extrusion and manufactured into tube cladding using cold rolling process.ODS steels present low ductility and high hardness at room temperature which complicate their manufacturing. Cold working leads to the hardening of the tube which needs to be softened by heat treatment.A new high temperature fabrication route performed on a Fe-9Cr-1W-Ti-Y 2 O 3 -ODS martensitic steel has been designed by following the hardness values, the morphological and crystallographic anisotropy and the nano-precipitation size evolution at each step of the fabrication route.Observations show that phase transformation from ferrite (α) to austenite (γ) is crucial to reduce the morphological and the crystallographic anisotropy induced by the manufacturing processes. The high temperature heat treatments permit to make the austenitic grain grow leading to an improvement of the cold workability.Ultimate Tensile Strength values obtained in the hoop direction remain about 315MPa at 650°C which is slightly lower compared to other Fe-9Cr ODS tubes but the new microstructure could be more favorable for creep properties.

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Interfacial strained structure and orientation relationships of the nanosized oxide particles deduced from elasticity-driven morphology in oxide dispersion strengthened materials

Cited by 240 publications

References 51 publications

Anisotropic intergranular damage development and fracture in a 14Cr ferritic ODS steel under high-temperature tension and creep

Anisotropic intergranular damage development and fracture in a 14Cr ferritic ODS steel under high-temperature tension and creep

Oxide nanoparticles in an Al-alloyed oxide dispersion strengthened steel: crystallographic structure and interface with ferrite matrix

Assessment of a new fabrication route for Fe–9Cr–1W ODS cladding tubes

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