Tube manufacturing and characterization of oxide dispersion strengthened ferritic steels

Ukai, Shigeharu; Mizuta, S; Yoshitake, Tunemitsu; Okuda, Takanari; Fujiwara, Masayuki; Hagi, Shigeki; Kobayashi, Toshimi

doi:10.1016/s0022-3115(00)00114-8

Cited by 138 publications

(86 citation statements)

References 8 publications

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“…As described in our previous study, 10) ODS ferritic steel claddings were manufactured with parameters of ytrria and titanium contents. Their chemical compositions are listed in Table 1, 10) where the specimens are denoted as F1 to F4.…”

Section: Manufactured Claddingsmentioning

confidence: 99%

“…Their chemical compositions are listed in Table 1, 10) where the specimens are denoted as F1 to F4. Four levels of Y 2 O 3 contents were selected below 0.25 mass%, because recrystallized structure could only be realized by yttria addition of less than 0.25 mass%.…”

Section: Manufactured Claddingsmentioning

confidence: 99%

“…The internal creep rupture properties in the hoop stress mode of the manufactured ODS ferritic claddings were measured at 973 K in the previous study, 10) and the results are shown in Fig. 2.…”

Section: Creep Rupture Propertiesmentioning

confidence: 99%

“…6,7) It was preliminarily shown that re-crystallization heat-treatment softened the hardened structure and allowed control of the grain morphology in the course of cold-rolling manufacturing of ODS claddings, 8,9) resulting in a superior creep rupture strength in the hoop direction of the claddings. 10) In this study, the creep properties of previously manufactured ODS ferritic steel claddings are investigated for the cases of hoop and longitudinal stress modes. The chemical form of the oxide particles is analyzed by means of both transmission electron microscopy and chemical analyses to interpret the relationship between oxide particle distribution morphology and creep strength.…”

Section: Introductionmentioning

confidence: 99%

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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

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145

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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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Section: Manufactured Claddingsmentioning

confidence: 99%

Section: Manufactured Claddingsmentioning

confidence: 99%

Section: Creep Rupture Propertiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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

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145

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“…Oxide dispersion strengthened (ODS) reduced activation ferritic (RAF) steels appear as promising materials for application in fusion power reactors up to about 750°C [1][2][3]. One of the major issues in the development of ODS RAF steels for first wall application is their thermal shock resistance.…”

Section: Introductionmentioning

confidence: 99%

High heat flux testing of 12–14Cr ODS ferritic steels

Pintsuk

Oksiuta

Linke

et al. 2010

Journal of Nuclear Materials

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a b s t r a c tThe thermal performance of Fe-(12-14)Cr-2W-0.3Ti-0.3Y 2 O 3 ODS reduced activation ferritic steels, which are considered as candidate first wall materials for the future fusion power reactors and were manufactured by mechanical alloying in hydrogen and hot isostatic pressing, was assessed by high heat flux (HHF) testing with the electron beam JUDITH facility at the Forschungszentrum Jülich (FZJ), Germany. An analysis of the microhardness and microstructure of the specimens was done before and after HHF tests.In general, both materials present a ferritic (a-Fe, bcc) microstructure with a wide range of grain sizes from 100 to 500 nm up to a few micrometers. The coarse grains are almost dislocation-free, while the smaller ones are surrounded by tangles of dislocations. Oxide and carbide impurities (about a few hundreds nm in size) and a high density of Y-Ti-O nano-clusters, with a mean size of about 5 nm, are also present. The microhardness, density and tensile strength of the 14Cr material are slightly larger than those of the 12Cr material.HHF tests revealed that there is no difference in thermal performance, level of degradation and erosion behaviour of 12Cr and 14Cr ODS steels. The onset of melting of the materials occurs for an energy density between 1 and 1.5 MJ/m 2 . Below this value only some kind of thermal etching takes place. This is a significant improvement compared to stainless steel, for which severe plastic deformation at the material surface was observed.

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Reduced activation ODS ferritic steel – recent development in high speed hot extrusion processing

Oksiuta

Lewandowska

Kurzydłowski

et al. 2010

Physica Status Solidi (a)

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The paper presents the microstructure and mechanical properties of an oxide dispersion strengthened (ODS), reduced activation, ferritic steel, namely the Fe-14Cr-2W-0.3Ti-0.3Y 2 O 3 alloy, which was fabricated by hot isostatic pressing followed by high speed hydrostatic extrusion (HSHE) and heat treatment HT at 1050 8C. Transmission electron microscopy (TEM) observations revealed significant differences in the grain size and dislocation density between the as-HIPped and as-HSHE materials. It was also found that the microstructure of the steel is stable after HT. The HSHE process improves significantly the tensile and Charpy impact properties of the as-HIPped steel. The ultimate tensile strength at room temperature increases from 950 up to 1350 MPa, while the upper shelf energy increases from 3.0 up to 6.0 J. However, the ductile-tobrittle transition temperature (DBTT) remains relatively high (about 75 8C). These results indicate that HSHE is a promising method for achieving grain refinement and thus improving the mechanical properties of ODS ferritic steels.

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Tube manufacturing and characterization of oxide dispersion strengthened ferritic steels

Cited by 138 publications

References 8 publications

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

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

High heat flux testing of 12–14Cr ODS ferritic steels

Reduced activation ODS ferritic steel – recent development in high speed hot extrusion processing

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