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

Ukai, Shigeharu; Mizuta, S; Fujiwara, Masayuki; Okuda, Takanari; Kobayashi, Toshimi

doi:10.1080/18811248.2002.9715260

Cited by 147 publications

(34 citation statements)

References 23 publications

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“…The temperatures obtained (around 850°C for starting point Ac 1 and 900°C for finishing point Ac 3 ) are similar to phase transformation temperatures of conventional martensitic steel and of other 9Cr-ODS materials [14][15][16].…”

Section: Phase Transformationsupporting

confidence: 48%

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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Section: Phase Transformationsupporting

confidence: 48%

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 (ODS) steels have been identified as a promising candidate structural material for Generation IV and fusion reactors because of their superior high-temperature mechanical properties and improved radiation resistance compared to conventional ferritic/martensitic steels [1][2][3]. These properties are achieved by introducing stable oxide dispersoids into the ferritic matrix which act as pinning sites for dislocations, sinks for radiation-induced point defects and limit grain growth [4][5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Effect of Ti and Cr on dispersion, structure and composition of oxide nano-particles in model ODS alloys

et al. 2015

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a b s t r a c tThree model ODS alloys (Fe-0.3Y 2 O 3 , Fe-0.2Ti-0.3Y 2 O 3 and Fe-14Cr-0.2Ti-0.3Y 2 O 3 ) were prepared by ball milling and then hot extrusion to study the effect of Ti and Cr on the size, distribution, crystal structure and composition of the nano-oxide particles. All alloys were characterized by high resolution transmission electron microscopy (HRTEM), atom probe tomography (APT) and synchrotron-X-ray diffraction (S-XRD) to determine the distribution, structure and composition of the oxide nanoparticles samples. The median particle sizes were 9.6 nm, 7.7 nm and 3.7 nm for the Fe-Y 2 O 3 , Fe-Ti-Y 2 O 3 and Fe-Cr-Ti-Y 2 O 3 alloys, respectively, so the presence of Ti resulted in a significant reduction in oxide particle diameter and the addition of Cr gave a further reduction in size. In the Fe-0.3Y 2 O 3 alloy, the particles are found to be bcc Y 2 O 3 , whereas in the other two alloys (Fe-Ti-0.3Y 2 O 3 and Fe-Cr-Ti-Y 2 O 3 ), the oxide particles were found to be structurally consistent with both orthorhombic Y 2 TiO 5 and fcc Y 2 Ti 2 O 7 . Detailed APT studies showed Cr shells around oxide particles of all sizes in the Fe-Cr-Ti-Y 2 O 3 alloy, that a range of cluster compositions are present and that the particle chemistry varies with cluster size. We show that the addition of Cr has a strong effect on both the size and stoichiometry of the particles.

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“…Owing to the exceptional strength, creep and fatigue properties in addition to thermomechanical stability and irradiation resistance, oxide-dispersion-strengthened (ODS) alloys were initially designed for nuclear reactor applications [1][2][3][4][5][6][7][8][9][10][11][12][13]. These outstanding mechanical properties, capable of a wide range of operating temperatures, offer superior performance in a number of environmental conditions.…”

Section: Introductionmentioning

confidence: 99%

Tying Processing Parameters to the Microstructure and Mechanical Properties of Nanostructured FeNiZr Consolidated via the Field Assisted Sintering Technique

Fudger

Luckenbaugh²,

Roberts

et al. 2019

Metals

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An oxide-dispersion-strengthened (ODS) nanostructured FeNiZr alloy was fabricated via high energy mechanical alloying, and subsequently consolidated by the field assisted sintering technique (FAST). A range of input parameters: Temperature, hold time and pressure were evaluated in an effort to optimize the mechanical response of the material. Improvements in density, up to 98.6% of theoretical, were observed with increasing consolidation temperature and hold time at the cost of decreasing hardness values resulting from microstructural coarsening. Hardness values decreased from 650 to 275 HV by increasing processing temperatures from 750 to 1100 °C. The relationships between the varied processing parameters, microstructure and the experimentally measured yield and ultimate tensile strengths are discussed. Specifically, the effect of varying the temperature and hold time on the resulting porosity, as observed via scanning electron microscopy (SEM) in tensile and compression samples, is emphasized.

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

Cited by 147 publications

References 23 publications

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

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

Effect of Ti and Cr on dispersion, structure and composition of oxide nano-particles in model ODS alloys

Tying Processing Parameters to the Microstructure and Mechanical Properties of Nanostructured FeNiZr Consolidated via the Field Assisted Sintering Technique

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