Creep response and deformation processes in nanocluster-strengthened ferritic steels

Hayashi, Teruaki; Sarosi, Peter; Schneibel, J.H.; Mills, Michael J.

doi:10.1016/j.actamat.2007.11.038

Cited by 137 publications

(54 citation statements)

References 29 publications

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“…The ODS displays great potential as promising structural materials for advanced nuclear energy systems due to the excellent radiation stability and creep resistance at high temperature. [13][14][15][16] Ultrafine Y-Ti-O nanoclusters, acting as a sink for radiation-produced point defects, block mobile dislocations and therefore improve the hightemperature strength. Furthermore, ultrafine (2-4 nm) Y-Ti-O nanoclusters are extremely resistant to coarsening during isothermal annealing even up to 1300 • C and radiation damage.…”

Section: Introductionmentioning

confidence: 99%

First principles investigation of structural, electronic, elastic and thermal properties of rare-earth-doped titanate Ln2TiO5

et al. 2012

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Systematic first-principles calculations based on density functional theory were performed on a wide range of Ln2TiO5 compositions (Ln = La, Ce, Pr, Nd, Sm, Gd, Tb, Dy and Y) in order to investigate their structural, elastic, electronic, and thermal properties. At low temperature, these compounds crystallize in orthorhombic structures with a Pnma symmetry, and the calculated equilibrium structural parameters agree well with experimental results. A complete set of elastic parameters including elastic constants, Hill's bulk moduli, Young's moduli, shear moduli and Poisson's ratio were calculated. All Ln2TiO5 are ductile in nature. Analysis of densities of states and charge densities and electron localization functions suggests that the oxide bonds are highly ionic with some degree of covalency in the Ti-O bonds. Thermal properties including the mean sound velocity, Debye temperature, and minimum thermal conductivity were obtained from the elastic constants

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Section: Introductionmentioning

confidence: 99%

First principles investigation of structural, electronic, elastic and thermal properties of rare-earth-doped titanate Ln2TiO5

et al. 2012

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“…Recent results show a beneficial effect of oxide nanoparticles on the high temperature thermal, creep, and irradiation resistance [8,9]. However, this effect is observed only if these particles are sufficiently small and well dispersed in the ferritic matrix.…”

Section: Introductionmentioning

confidence: 99%

Microstructural changes upon annealing in ODS-strengthened ultrafine grained ferritic steel

et al. 2013

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In this study, the stability of grain size and oxide nanoparticles in the ODS steel upon annealing at high temperature (650-1350°C) has been evaluated. The ODS Fe-Cr-W-Ti-Y 2 O 3 steel has been manufactured by powder metallurgy, consolidated by hot isostatic pressing and processed by hydrostatic extrusion. Such a processing brings about ultrafine grain structure reinforced with oxide nanoparticles (few nm in diameter) and results in superior mechanical properties. The stability of nano-oxides has been analyzed by small angle X-ray scattering together with transmission electron microscopy. The results obtained revealed excellent thermal stability of ultrafine grained ODS ferritic steel, which was attributed to the resistance of oxides against coarsening.

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“…In oxide dispersion strengthened (ODS) RAFM steels, the oxide nanoparticles tend to retard grain growth through a boundary pinning effect [4,5], which improves the system thermal stability and allows extending the working temperature [6,7]. Oxide nanoparticle dispersions also increase the resistance to irradiation damage since the particles act as trapping sites for structural defects induced by radiation [4].…”

Section: Introductionmentioning

confidence: 99%

Microstructural characterization of the ODS Eurofer 97 EU-batch

Mateus¹,

Carvalho²,

Nunes³

et al. 2011

Fusion Engineering and Design

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Four as-processed forms (Plate 16, Plate 6, Rod 20 and Rod 12.5) of the ODS Eurofer 97 EU-batch produced under different thermomechanical conditions have been investigated by scanning nuclear microprobe, scanning and transmission electron microscopy, energy dispersive X-ray spectroscopy, electron backscattered diffraction, hightemperature X-ray diffraction and microhardness measurements. The materials presented a ferritic microstructure with a homogeneous distribution of Y. The thicker plate presented a fine carbide dispersion while the other forms showed carbide morphologies corresponding to pseudo-pearlitic and pseudo-bainitic transformations with wellmatched hardness values. Hot rolling induced crystallographic textures of the {101}< 1 10 > type, rotary swaging resulted in a complex texture, and extrusion produced a strong <101> fiber texture. X-ray diffraction experiments at high temperature showed that at a cooling rate of 5 ºC/min the complete austenite-to-ferrite transformation occurs between 760 and 750 ºC compromising the material quenchability.

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Creep response and deformation processes in nanocluster-strengthened ferritic steels

Cited by 137 publications

References 29 publications

First principles investigation of structural, electronic, elastic and thermal properties of rare-earth-doped titanate Ln2TiO5

First principles investigation of structural, electronic, elastic and thermal properties of rare-earth-doped titanate Ln2TiO5

Microstructural changes upon annealing in ODS-strengthened ultrafine grained ferritic steel

Microstructural characterization of the ODS Eurofer 97 EU-batch

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