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JAEA Reports

Recent accomplishment for the development of reduced activation ferritic/martensitic steels; Interim report for HFIR phase 4 with results of relating activities

Department of Materials Science; Department of Fusion Engineering Research (Tokai Site)

JAERI-Review 2004-018, 97 Pages, 2004/08

JAERI-Review-2004-018.pdf:18.92MB

Extensive efforts for evaluating the irradiation performances of a reduced activation ferritic/martensitic steel (RAF/M) of F82H* and other several RAF/Ms have been made in recent several years. They are, examinations of the effects of neutron irradiation on (1) Ductile to brittle transition temperature (DBTT) up to a damage level of 20 dpa to explore lower temperature limit, (2) Enhanced He effect on DBTT shift for Ni/B doped heats (isotopic tailoring method was used for B doping), (3) Susceptibility to environmentally assisted cracking by the slow strain rate tensile tests (SSRT) in a high temperature pressurized water and (4) Flow stress-plastic strain relation obtained by measuring the profile of the specimen during tensile testing, together with the activities of (5) the development of the test methods after neutron irradiation and (6) other supporting researches. Results are summarized in the present report. They clearly indicate the good applicability of RAF/Ms to fusion machines.

Journal Articles

Microstructure property analysis of HFIR-irradiated reduced-activation ferritic/martensitic steels

Tanigawa, Hiroyasu; Hashimoto, Naoyuki*; Sakasegawa, Hideo*; Klueh, R. L.*; Sokolov, M. A.*; Shiba, Kiyoyuki; Jitsukawa, Shiro; Koyama, Akira*

Journal of Nuclear Materials, 329-333(1), p.283 - 288, 2004/08

 Times Cited Count:18 Percentile:75.95(Materials Science, Multidisciplinary)

Reduced-activation ferritic/martensitic steels (RAFs) were developed as candidate structural materials for fusion power plants. In a previous study, it was reported that ORNL9Cr-2WVTa and JLF-1 (Fe-9Cr-2W-V-Ta-N) steels showed smaller ductile-brittle transition temperature (DBTT) shifts compared to IEA modified F82H (Fe-8Cr-2W-V-Ta) after neutron irradiation up to 5 dpa at 573K. This difference in DBTT shift could not be interpreted as an effect of irradiation hardening, and it is also hard to be convinced that this difference was simply due to a Cr concentration difference. To clarify the mechanisms of the difference in Charpy impact property between these steels, various microstructure analyses were performed.

Journal Articles

Analysis of Ta-rich MX precipitates in RAFs

Tanigawa, Hiroyasu; Sakasegawa, Hideo*; Hashimoto, Naoyuki*; Zinkle, S. J.*; Klueh, R. L.*; Koyama, Akira*

Fusion Materials Semiannual Progress Report for the Period Ending (DOE/ER-0313/35), p.33 - 36, 2004/04

Extraction replica samples were prepared from F82H-IEA, F82H HT2, JLF-1 and ORNL9Cr to analyze the precipitate distribution. The samples were examined to obtain precipitate size distribution with TEM and to analyze chemical composition distribution with SEM. Back-scattered electron imaging was found to be the effective way to separate Ta-rich precipitate from other precipitates. Results showed that most of the precipitates were M23C6, and the shape is a round ellipsoid in F82H-IEA and HT2, but was a long ellipsoid in JFL-1 and ORNL9Cr. It was also found that MX precipitates were few and large and contain Ti in F82H-IEA and HT2, but a lot of fine MX precipitates without Ti were observed in JLF-1 and ORNL9Cr.

Journal Articles

Analysis of extraction residue of HFIR 11J-irradiated RAFs

Tanigawa, Hiroyasu; Sakasegawa, Hideo*; Zinkle, S. J.*; Klueh, R. L.*; Koyama, Akira*

Fusion Materials Semiannual Progress Report for the Period Ending (DOE/ER-0313/35), p.30 - 32, 2004/04

Extraction residue was made from several HFIR 11J-irradiated RAFs, and the mass change was measured to investigate the irradiation-enhanced change in precipitation. Two different types of filter with coarse and fine pores were used in order to separate the difference of irradiation effects between larger and smaller precipitates. Unirradiated specimens were examined as well. Results suggest that during irradiation the mass of larger precipitates increased in F82H-IEA, Ni-doped F82H, JLF-1 and ORNL9Cr, fine precipitates disappeared in JLF-1, and fine precipitates increased in Ni-doped F82H.

Journal Articles

X-ray diffraction analysis on precipitates of 11J irradiated RAFs

Tanigawa, Hiroyasu; Sakasegawa, Hideo*; Payzant, E. A.*; Zinkle, S. J.*; Klueh, R. L.*; Koyama, Akira*

Fusion Materials Semiannual Progress Report for the Period Ending (DOE/ER-0313/35), p.37 - 40, 2004/04

XRD analyses were performed on the extraction residue of HFIR 11J-irradiated RAFs to investigate the overall precipitate character. Un-irradiated and aged specimens were examined as well. Results suggested that the distinctive peaks of M23C6 (M; Cr, Fe, W) were observed on all specimens. Peaks possibly related to MX (M;Ta,Ti,V : X ; C, N) were observed on the specimens extracted from un-irradiated JLF-1 and ORNL9Cr, but those peaks were not observed on irradiated specimens.

Journal Articles

On the effects of fatigue precracking on the microstructure around precrack in 1TCT fracture toughness specimen of F82H-IEA

Tanigawa, Hiroyasu; Hashimoto, Naoyuki*; Sokolov, M. A.*; Klueh, R. L.*; Ando, Masami

Fusion Materials Semiannual Progress Report for the Period Ending (DOE/ER-0313/35), p.58 - 60, 2004/04

1TCT fracture toughness specimens of F82H-IEA steel were fatigue precracked and sliced in specimen thickness wise for microstructure analysis around the precrack. The microstructure around the precrack was observed by optical microscopy (OM), scanning electron microscopy (SEM), orientation imaging microscopy (OIM), and transmission electron microscopy (TEM). TEM samples around the crack front were prepared by focused ion beam (FIB) processor. The fracture surfaces of tested 1TCT specimens were also observed. OM observation showed that the precrack penetration was straight in the beginning, and then tended to follow a prior austenite grain boundary and to branch into 2 to 3 directions at the terminal. SEM and OIM observations revealed that the both microstructures around the precracks and ahead of the precrack had turned into cell structure, which is the typical microstructure of fatigue-loaded F82H. TEM images and inverse pole figures obtained from the crack-front region confirmed this structure change.

Journal Articles

Investigation of irradiation behavior of SiC-coated fuel particle at extended burnup

Sawa, Kazuhiro; Tobita, Tsutomu*

Nuclear Technology, 142(3), p.250 - 259, 2003/06

 Times Cited Count:12 Percentile:64.02(Nuclear Science & Technology)

The maximum burnup of the first-loading fuel of the HTTR is limited to 3.6%FIMA to certify its integrity during the operation. In order to investigate fuel behavior under extended burnup condition, irradiation tests were performed. The thickness of buffer and SiC layers of the irradiated fuel particles were increased to keep their integrity up to over 5%FIMA. The fuel compacts were irradiated in independent capsules at the HFIR of ORNL, and at the JMTR of JAERI, respectively. The comparison of measured and calculated (R/B)s showed that additional failures occurred in both irradiation tests. A pressure vessel failure model analysis showed that no tensile stresses acted on the SiC layers even at the end of irradiation and no pressure vessel failure occurred in the intact particles. The presumed failure mechanisms are additional through-coatings failure of as-fabricated SiC-failed particles or an excessive increase of internal pressure by the accelerated irradiation. The further study is needed to clarify the failure mechanism.

Journal Articles

Microstructural study of irradiated isotopically tailored F82H steel

Wakai, Eiichi; Miwa, Yukio; Hashimoto, Naoyuki*; Robertson, J. P.*; Klueh, R. L.*; Shiba, Kiyoyuki; Abiko, Kenji*; Furuno, Shigemi*; Jitsukawa, Shiro

Journal of Nuclear Materials, 307-311(Part.1), p.203 - 211, 2002/12

 Times Cited Count:23 Percentile:81.34(Materials Science, Multidisciplinary)

no abstracts in English

Journal Articles

Microstructural evolution of cold-worked austenitic stainless steels irradiated to 17 DPA in spectrally tailored experiments of the ORR and HFIR at 400$$^{circ}$$C

Wakai, Eiichi; Hashimoto, N.*; J.P.Robertson*; Sawai, Tomotsugu; Hishinuma, Akimichi

Fusion Materials, 313(25), p.197 - 201, 1999/04

no abstracts in English

Journal Articles

Hydrogen production effect on microstructure of HFIR; Irradiated low activation F82H steel using $$^{54}$$Fe isotope

Wakai, Eiichi; Hashimoto, N.*; Shiba, Kiyoyuki; Miwa, Yukio; J.P.Robertson*; R.L.Klueh*

Fusion Materials, 313(25), p.151 - 160, 1999/04

no abstracts in English

Journal Articles

Swelling of HFIR-irradiated F82H, F82H+$$^{10}$$B and F82H+$$^{58}$$Ni steels

Wakai, Eiichi; Hashimoto, N.*; Shiba, Kiyoyuki; Miwa, Yukio; J.P.Robertson*; R.L.Klueh*

Fusion Materials, 313(25), p.161 - 169, 1999/04

no abstracts in English

Journal Articles

Microstructural evolution of welded austenitic stainless steel irradiated in HFIR target experiments

Sawai, Tomotsugu; Shiba, Kiyoyuki; Hishinuma, Akimichi

Journal of Nuclear Materials, 258-263, p.1997 - 2001, 1998/00

 Times Cited Count:3 Percentile:32.94(Materials Science, Multidisciplinary)

no abstracts in English

JAEA Reports

Study of irradiation damage structures in austenitic stainless steels

Hamada, Shozo

JAERI-Tech 97-041, 180 Pages, 1997/08

JAERI-Tech-97-041.pdf:13.34MB

no abstracts in English

Journal Articles

Radiation induced swelling in welded austenitic stainless steel

Sawai, Tomotsugu; Shiba, Kiyoyuki; Fukai, Katsumaro; Hishinuma, Akimichi

6WS-96: 6th Int. Welding Symp. on the Role of Welding Science and Technology in the 21st Century, 2, p.483 - 488, 1996/00

no abstracts in English

JAEA Reports

Fuel temperature prediction during high burnup HTGR fuel irradiation test; US-JAERI irradiation test for HTGR fuel

Sawa, Kazuhiro; Fukuda, Kosaku; R.Acharya*

JAERI-Tech 94-038, 46 Pages, 1995/01

JAERI-Tech-94-038.pdf:1.26MB

no abstracts in English

Journal Articles

Compositional behavior and stability of MC-type precipitates in JPCA austenitic stainless steel during HFIR irradiation

Suzuki, Masahide; Hamada, Shozo; P.J.Maziasz*; Jitsukawa, Shiro; Hishinuma, Akimichi

Journal of Nuclear Materials, 191-194, p.1351 - 1355, 1992/00

 Times Cited Count:13 Percentile:75.55(Materials Science, Multidisciplinary)

no abstracts in English

Journal Articles

Neutron powder diffraction with monochromated steady-state beam

Morii, Yukio

Nihon Kessho Gakkai-Shi, 34(2), p.62 - 69, 1992/00

no abstracts in English

Journal Articles

Low temperature neutron irradiation damage of stainless steels; Recent results from HFIR/ORR US-Japan collaborative irradiation experiment

Hishinuma, Akimichi

Nihon Genshiryoku Gakkai-Shi, 33(10), p.926 - 932, 1991/10

 Times Cited Count:0 Percentile:0.01(Nuclear Science & Technology)

no abstracts in English

Journal Articles

Application of electron energy loss spectroscopy to microchemical analysis of Ti-modified austenitic stainless steel irradiated in HFIR

Hojo, Kiichi; Jitsukawa, Shiro; Suzuki, Masahide; Hamada, Shozo; Hishinuma, Akimichi

Journal of Nuclear Materials, 179-181, p.496 - 499, 1991/00

 Times Cited Count:1 Percentile:20.44(Materials Science, Multidisciplinary)

no abstracts in English

Journal Articles

Stress-strain relations of HFIR-irradiated austenitic stainless steels

Jitsukawa, Shiro; M.L.Grossbeck*; Hishinuma, Akimichi

Journal of Nuclear Materials, 179-181, p.563 - 567, 1991/00

 Times Cited Count:13 Percentile:79.31(Materials Science, Multidisciplinary)

no abstracts in English

25 (Records 1-20 displayed on this page)