Reduced activation martensitic steels as a structural material for ITER test blanket

Shiba, K.; Enoeda, Mikio; Jitsukawa, Shiro

doi:10.1016/j.jnucmat.2004.04.018

Cited by 54 publications

(27 citation statements)

References 14 publications

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“…Steel of F82H [1][2][3] is planned to use for a Japanese ITER test blanket module. 4) According to the trial design the test blanket is fabricated by mainly hot isostatic pressing and tungsten inert gas welding 5) and the total mass of a unit module exceeds 2 ton. 6) Therefore, heating rate of tempering after hipping is considered to be very small.…”

Section: Introductionmentioning

confidence: 99%

Creep Behavior of Double Tempered 8%Cr-2%WVTa Martensitic Steel

Tamura

Nowell²,

Shinozuka

et al. 2006

Mater. Trans.

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Creep testing was carried out at around 650 C for a martensitic 8Cr-2WVTa steel (F82H), which is a candidate alloy for the first wall of the fusion reactors of the Tokamak type. Rupture strength of the double tempered steel (F82HD) is lightly higher than that of simply tempered steel (F82HS). On the other hand, creep rate of F82HD is obviously smaller than that of F82HS in acceleration creep, though creep strain of F82HD in transition creep, where creep rate decreases with increasing strain, is larger than that of F82HS. Hardness of the crept F82HD decreases with increasing creep strain, which corresponded with the transmission electron microscopy (TEM) observation. On the contrary, X-ray diffraction and electron back-scattered diffraction pattern measurements show that fine sub-grains are created during transition creep. The creep curves were analyzed using an exponential type creep equation and the apparent activation energy, the activation volume and the pre-exponential factor were calculated as a function of creep strain. Then, these parameters were converted into two parameters, i.e. equivalent obstacle spacing (EOS) and mobile dislocation density parameter (MDDP). While EOS decreases with increasing creep strain, MDDP increases with increasing strain during transition creep. The decrease in EOS and the increase in either EOS or MDDP are rate-controlling factors in transition and acceleration creep, respectively. On the other hand, in case of F82HS, EOS increases and MDDP decreases during transition creep. In this case, the decrease in MDDP controls the creep rate during transition creep of F82HS. It is concluded that both EOS and MDDP are representative parameters of the change in substructure during creep.

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Section: Introductionmentioning

confidence: 99%

Creep Behavior of Double Tempered 8%Cr-2%WVTa Martensitic Steel

Tamura

Nowell²,

Shinozuka

et al. 2006

Mater. Trans.

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“…Relationship between test temperature and absorbed energy in the previous report 9) and present work. (a) General purity F82H, (b) High purity F82H.…”

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confidence: 64%

Influence of Ti on Inclusion Formation of Reduced Activation Ferritic/Martensitic Steels

Sawahata¹,

Tanigawa²,

Shiba³

et al. 2007

J. Japan Inst. Metals

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Reduced activation ferritic/martensitic steels (RAFs), such as F82H (Fe 8Cr 2W 0.2V 0.04Ta 0.1C), are the leading candidates for structural materials of fusion reactors, and it is essential for the development of RAFs to assure its good for fusion application. In this study, the influence of Ti on impact property was studied based on microstructural analyses and charpy impact tests which were performed in general purity F82H (0.004Ti 0.0060N) and high purity F82H (＜0.001Ti 0.0014N). In general purity F82H, its impact property around DBTT showed both 100 brittle fracture and brittle ductile, and this tendency did not appear in high purity F82H. SEM observation on those brittle fracture surfaces of general purity F82H revealed the presence of Al 2 O 3  Ta(V, Ti)O composite oxides at the fracture initiation point. The size distribution analyses of oxides indicate that the complex oxide in general purity F82H showed a higher number density than in high purity F82H. In addition to this, EDS analyses showed that complex oxides in general purity F82H had a strong peak of Ti, but they were not detected in the oxides in high purity F82H. These results suggest that Ti has a significant influence on the formation of oxides, which in turn affects impact property.

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“…Since then, material improvement and property data have been accumulated [43,44]. In fabrication technology development for the DEMO blanket, a hot isostatic pressing (HIP) bonding method [45], especially for the firstwall structure, with built-in cooling tubes has been proposed, tested, and optimized (Figure 27).…”

Section: Bleeding Blanket Technologymentioning

confidence: 99%

Evolution of the ITER program and prospect for the next-step fusion DEMO reactors: status of the fusion energy R&D as ultimate source of energy

Matsuda

Tobita²

2013

Journal of Nuclear Science and Technology

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An international joint project of fusion experimental reactor, the ITER (International Thermonuclear Experimental Reactor), is reviewed in view of long-range fusion energy research and development (R&D). Its purpose, goal, evolution, and the present construction status are briefly reviewed. While the ITER is a core machine in the present stage, generation of electricity is a role of the next-step fusion demonstration power plant "DEMO." The status of designs and technology R&D for DEMO are also reviewed.

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Reduced activation martensitic steels as a structural material for ITER test blanket

Cited by 54 publications

References 14 publications

Creep Behavior of Double Tempered 8%Cr-2%WVTa Martensitic Steel

Creep Behavior of Double Tempered 8%Cr-2%WVTa Martensitic Steel

Influence of Ti on Inclusion Formation of Reduced Activation Ferritic/Martensitic Steels

Evolution of the ITER program and prospect for the next-step fusion DEMO reactors: status of the fusion energy R&D as ultimate source of energy

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