Creep constitutive equation of dual phase 9Cr-ODS steel

Sakasegawa, Hideo; Ukai, Shigeharu; Tamura, Manabu; Ohtsuka, Satoshi; Tanigawa, Hiroyasu; Ogiwara, Hideaki; Fujiwara, Masayuki

doi:10.1016/j.jnucmat.2007.05.031

Cited by 32 publications

(16 citation statements)

References 18 publications

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“…The stress exponent of steady state creep rate is believed to be 1-2 for grain boundary sliding as well as for grain boundary diffusion creep, while it is 3-7 for dislocation creep. The value for the 9Cr-ODS steel experimentally determined was 7-11 at 700°C [12] that is a little higher but approximately agrees with the value for dislocation creep model. The grain boundary sliding would often be accompanied by other deformation process that accommodates the discontinuity produced by grain boundary sliding between neighboring grains.…”

Section: A Possible Model To Explain the Effects Of Titanium Concentrsupporting

confidence: 81%

Nano-mesoscopic structural characterization of 9Cr-ODS martensitic steel for improving creep strength

Ohtsuka

Ukai

Sakasegawa

et al. 2007

Journal of Nuclear Materials

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Section: A Possible Model To Explain the Effects Of Titanium Concentrsupporting

confidence: 81%

Nano-mesoscopic structural characterization of 9Cr-ODS martensitic steel for improving creep strength

Ohtsuka

Ukai

Sakasegawa

et al. 2007

Journal of Nuclear Materials

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“…In contrast, ODS Eurofer shows lower stress exponents, i.e., 3.9-5.5 in the temperature range 500-750°C indicating strain rate sensitivity noticeably lower than the corresponding to non-ODS Eurofer [35]. Although these stress exponent values can be compatible with deformation controlled by generation and climb of dislocations at obstacles, an alternative deformation model for accounting the creep results in ODS 9 %Cr steel has been proposed [36]. This model tries the F/M ODS 9 %Cr steel as a composite material where grain boundary sliding occurs in the ferrite and slip in the martensite.…”

Section: Strain Rate Jump Experiments and Deformation Mechanismmentioning

confidence: 98%

Grain boundary misorientation and positron annihilation characteristics in steel Eurofer processed by equal channel angular pressing

et al. 2014

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Electron back-scattered diffraction and positron annihilation lifetime measurements were performed on the ferritic-martensitic 9 %Cr Eurofer steel processed by equal channel angular pressing (ECAP) at 550°C. The orientation imaging mapping images reveal ECAP-induced changes toward a more stable texture via rotation around h111i and h110i axes. These are accompanied by transformation of martensite into ferrite and a remarkable change in the bimodal distribution of grain misorientations with reduction of the fraction of high-angle grain boundaries. The positron annihilation measurements evidence the release of vacancies retained in the ECAP-processed material and their clustering into nanovoids in samples heat treated at T C 500°C. It is found that tensile strain applied at 600°C can inhibit this void formation in the ECAPdeformed material for 1 and 2 passes, but not in the case of 4 passes. A model for accounting the results is proposed.

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“…The important is that the ductile rupture occurs in steady creep region without appearance of the third stage of tertiary creep [41], although the rapture time is much longer than the conventional ferritic steels.…”

Section: Creep Propertiesmentioning

confidence: 99%

Oxide Dispersion Strengthened Steels for Advanced Blanket Systems

Kimura

Wang

et al. 2016

Plasma and Fusion Research

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Oxide dispersion strengthened (ODS) steels with nano-scaled oxide particles in high density in ferrite/martensite matrix and on grain boundaries of ultra-fine grains have excellent properties as structural material for fusion blankets, while some issues of fabrication processes are still remaining to be solved. In this overview, material properties of recently developed ODS steels are introduced in comparison to ferritic/martensitic (F/M) steels: 1) mechanical properties, 2) corrosion behavior and 3) radiation tolerance in ODS steels, which are outstandingly superior to the F/M steels. Coupling use of the ODS and F/M steels is effective to expand the design margin of fusion blankets. R&D of dissimilar joining of FM/ODS steels is indispensable.

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Creep constitutive equation of dual phase 9Cr-ODS steel

Cited by 32 publications

References 18 publications

Nano-mesoscopic structural characterization of 9Cr-ODS martensitic steel for improving creep strength

Nano-mesoscopic structural characterization of 9Cr-ODS martensitic steel for improving creep strength

Grain boundary misorientation and positron annihilation characteristics in steel Eurofer processed by equal channel angular pressing

Oxide Dispersion Strengthened Steels for Advanced Blanket Systems

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