ODS-materials for high temperature applications in advanced nuclear systems

Eiselt, Ch.Ch.; Schendzielorz, Herbert; Seubert, Andreas; Hary, Benjamin; Carlan, Y. de; Diano, P.; Perrin, Benoît; Cédat, Denis

doi:10.1016/j.nme.2016.08.017

Cited by 35 publications

(12 citation statements)

References 17 publications

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“…For moderate or more concentrated nitric acid solutions (8M, 10M and 12M), the current revers was not observed, therefore, the partial cathodic current is higher than the partial anodic current even during the active domain. That indicates that the reaction (6) to (8) were enhanced by the autocatalytic mechanism of nitric acid, and the reaction (12) become dominant rather than the reaction (13). As a result, the surface of the specimen would be passivated in rapidly, though MP23 would undergo a certain dissolution as categorized "B" in [27].…”

Section: Surface Observationmentioning

confidence: 99%

“…Therefore, the corrosion resistance may be a disadvantage of 9 and 11Cr-ODS steels due to their low Cr concentration, though the other properties are superior. In fact, high Cr ODS steels have been developed from the view point of corrosion resistance, such as 14Cr-ODS steels, 18Cr-ODS steels, and Al added high Cr ODS steels [11][12][13]. Gwinner et al [14] reported that a ferritic 18Cr-ODS steel have much better corrosion resistance in nitric acid solutions than that of 9Cr-ODS steel.…”

Section: Introductionmentioning

confidence: 99%

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Corrosion behavior of ODS steels with several chromium contents in hot nitric acid solutions

Tanno

Takeuchi

Ohtsuka

et al. 2017

Journal of Nuclear Materials

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Oxide dispersion strengthened (ODS) steel cladding tubes have been developed for fast reactors. Tempered martensitic ODS steels with 9 and 11 wt% of chromium (9Cr-, 11Cr-ODS steel) are the candidate material in research being carried out at JAEA. In this work, fundamental immersion tests and electrochemical tests of 9 to 12Cr-ODS steels were systematically conducted in various nitric acid solutions at 95°C. The corrosion rate decreased exponentially with effective solute chromium concentration (Creff) and nitric acid concentration. Addition of vanadium (V) and ruthenium (Ru) also decreased the corrosion rate. The combination of low Creff and dilute nitric acid could not avoid the active mass dissolution during active domain at the beginning of immersion, and the corrosion rate was high. Higher Creff decreased the partial anodic current during the active domain and assisted the passivation of the surface of the steel. Concentrated nitric acid and addition of Ru and V increased partial cathodic current and shifted the corrosion potential to noble side. These effects should have prevented the active mass dissolution and decreased the corrosion rate.

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Section: Surface Observationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Corrosion behavior of ODS steels with several chromium contents in hot nitric acid solutions

Tanno

Takeuchi

Ohtsuka

et al. 2017

Journal of Nuclear Materials

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“…Oxide dispersion strengthened (ODS) steels are key candidate structural materials for advanced nuclear systems [ 1 , 2 , 3 , 4 ]. The high density of nanoscale oxides provides ODS steels with excellent mechanical performance by blocking dislocation slipping and hindering grain boundaries movement [ 5 , 6 , 7 , 8 , 9 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of Oxygen Content on Microstructure and Tensile Properties of a 22Cr-5Al ODS Steel

et al. 2021

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The high tensile strength and irradiation resistance of oxide dispersion strengthened (ODS) ferritic steels is attributed to the ultrafine and dispersed oxides within the matrix. The high content of oxygen and yttrium is critical for the formation of dense Y-rich oxides. However, only few studies have reported the effect of oxygen content on the microstructure and mechanical properties of ODS steels. Herein, we employed gas atomization reactive synthesis to prepare pre-alloy powders and then hot isostatic pressing (HIP) to consolidate two 22Cr-5Al ODS steels with different oxygen content. Our results showed Y-rich precipitates at and near grain boundaries of the as-HIPed alloys. Moreover, with the oxygen content increasing from 0.04 to 0.16 wt%, more precipitates precipitated in the as-HIPed alloy, and the ultimate tensile strength of the alloy was improved. However, increasing the oxygen content to 0.16 wt% led to formation of stripe and chain precipitates at and near grain boundaries, which caused a partial intergranular fracture of the as-HIPed alloy.

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“…The manufacturing of ODS steels has been widely studied, with different combinations of processing routes investigated. The most common manufacturing approach usually starts with mechanical alloying of elemental or pre-alloyed powders with a low fraction of oxide particles (typically Y 2 O 3 ) with the aim of providing a homogeneous dispersion of oxide nanoparticles in the final consolidated material [13][14][15][16][17][18][19]. The use of the spark plasma sintering (SPS) technique [20] to achieve the final densification of the milled powder, has increased in the last years, as it significantly shortens the time required for consolidation to a few minutes, compared with the several hours required for other sintering techniques such as hot isostatic pressing (HIP).…”

Section: Introductionmentioning

confidence: 99%

Microstructural and mechanical characterisation of Fe-14Cr-0.22Hf alloy fabricated by spark plasma sintering

Auger

Huang

Zhang

et al. 2018

Journal of Alloys and Compounds

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Fe-14Cr pre-alloyed powder and pure Hf powder were mechanically alloyed to produce powder with nominal composition Fe-14Cr-0.22Hf (wt. %) that was consolidated by the spark plasma sintering (SPS) technique in order to investigate the ability of Hf to produce a nanometric dispersion of oxide particles in a ferritic matrix. Comprehensive microstructural and mechanical characterisation of the as-milled powder and the consolidated material was performed using electron microscopy, X-ray diffraction, atom probe tomography and indentation techniques. It was shown that Hf additions can effectively produce, by internal oxidation, a fine scale dispersion of Hf-O nanoparticles in the consolidated material. A uniform grain structure was produced in the alloy. Although the nanoparticle dispersion was not homogeneous at the finest scale, the resulting dispersion strengthening contributed *Manuscript Click here to view linked References 2 significantly to the hardness. According to these results, internal oxidation of reactive elements rather than direct addition of oxides may offer additional opportunities in the design and development of oxide dispersion strengthened steels.

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ODS-materials for high temperature applications in advanced nuclear systems

Cited by 35 publications

References 17 publications

Corrosion behavior of ODS steels with several chromium contents in hot nitric acid solutions

Corrosion behavior of ODS steels with several chromium contents in hot nitric acid solutions

Effect of Oxygen Content on Microstructure and Tensile Properties of a 22Cr-5Al ODS Steel

Microstructural and mechanical characterisation of Fe-14Cr-0.22Hf alloy fabricated by spark plasma sintering

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