Alloying design of oxide dispersion strengthened ferritic steel for long life FBRs core materials

Ukai, Shigeharu; Harada, Masayuki; Okada, Hideya; Inoue, Masakí; Nomura, Shigeo; Shikakura, S.; Asabe, Kazutaka; Nishida, Takahiro; Fujiwara, Masayuki

doi:10.1016/0022-3115(93)90200-i

Cited by 306 publications

(142 citation statements)

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“…This material has been developed for the next-generation fuel-cladding tubes of sodium-cooled fast breeder reactors. 8) This steel has characteristic grain structure that is largely elongated in one direction. It shows depression of strength in high-temperature tension perpendicular to the grain axis, which intimates the presence of GBS.…”

Section: Introductionmentioning

confidence: 99%

Two-Dimensional Observation of Grain Boundary Sliding of ODS Ferritic Steel in High Temperature Tension

et al. 2014

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High-temperature tensile deformation was performed using ODS ferritic steel, which has grain structure largely elongated and aligned in one direction, in the direction perpendicular to the grain axis. In the superplastic region II, two-dimensional grain boundary sliding (GBS) was achieved, in which the material did not shrink in the grain-axis direction and grain-boundary steps appeared only in the surface perpendicular to the grain axis. In this condition, a classical grain switching event was observed. Using kernel average misorientation maps drawn with SEM/ EBSD, dominant deformation mechanisms and accommodation processes for GBS were examined in the different regions. Cooperative grain boundary sliding, in which only some of grain boundaries slide, was also observed.

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Section: Introductionmentioning

confidence: 99%

Two-Dimensional Observation of Grain Boundary Sliding of ODS Ferritic Steel in High Temperature Tension

et al. 2014

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“…The previous studies on ODS ferritic steel development [1][2][3][4][5] clearly demonstrated the need for a technological breakthrough in the application of ODS ferritic steels to cladding materials of the fuel pins. The first challenge is development of manufacturing technology for thin-walled ODS ferritic steel claddings by means of cold-rolling process.…”

Section: Introductionmentioning

confidence: 99%

Characterization of High Temperature Creep Properties in Recrystallized 12Cr-ODS Ferritic Steel Claddings

Ukai¹,

Okuda

Fujiwara

et al. 2002

Journal of Nuclear Science and Technology

152

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The high temperature strengthening mechanism of previously manufactured 12Cr-ODS ferritic steel claddings was clarified. In the recrystallized 12Cr-2W-0.3Ti-0.24Y 2 O 3 -ODS ferritic steel cladding, αY 2 TiO 5 type complex oxide formation was responsible for the drastic reduction of oxide particle size and the resulting shortened distance between particles, which led to superior internal creep rupture strength at 973 K because of the high resistance to gliding dislocation. Internal creep deformation was considered to be controlled by the grain boundary sliding associated with grain morphology: the near 11, 9 and 19 coincidence boundaries with a 110 common axis.

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“…This disadvantage has been found to be surmountable by inserting dispersoids in the ferritic matrix, to form what is known as oxide-dispersion-strengthened (ODS) ferritic steel. This steel is considered promising for use as cladding material in the long-life core of liquid metal fast reactor fuel pins [1][2][3][4][5] as well as for a low activated fusion reactor material. 6) In the ODS ferritic steels with a basic composition of FeCr-W-Ti-Y 2 O 3 , grain morphology control by recrystallization has been shown to be indispensable not only for softening the material hardened in the process of cold-rolling but also suppressing the strength degradation by grain boundary sliding.…”

Section: Introductionmentioning

confidence: 99%

Development of 9Cr-ODS Martensitic Steel Claddings for Fuel Pins by means of Ferrite to Austenite Phase Transformation

Ukai¹,

Mizuta²,

Fujiwara

et al. 2002

Journal of Nuclear Science and Technology

147

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For use as fuel cladding of liquid metal fast reactors, Fe-0.12C-9Cr-2W ODS martensitic steel claddings were developed by cold-rolling under the softened ferrite phase induced by slow cooling from austenite phase, subsequently by ferrite to austenite phase transformation to break up substantially elongated grains produced by cold-rolling at the final heat-treatment. The produced claddings showed noticeable improvement in tensile and creep rupture strength that are considerably superior to PNC-FMS and even austenitic PNC316 at higher temperature and extended time to rupture. The strength improvement is mainly attributed to titanium addition in ODS martensitic steels through its reduction of Y 2 O 3 particle size and shortening inter-particles spacing. The behavior of oxide particle size reduction is associated with stoichiometry between Y 2 O 3 and TiO 2 .

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Alloying design of oxide dispersion strengthened ferritic steel for long life FBRs core materials

Cited by 306 publications

References 1 publication

Two-Dimensional Observation of Grain Boundary Sliding of ODS Ferritic Steel in High Temperature Tension

Two-Dimensional Observation of Grain Boundary Sliding of ODS Ferritic Steel in High Temperature Tension

Characterization of High Temperature Creep Properties in Recrystallized 12Cr-ODS Ferritic Steel Claddings

Development of 9Cr-ODS Martensitic Steel Claddings for Fuel Pins by means of Ferrite to Austenite Phase Transformation

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