| Project/Area Number |
15560717
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Nuclear fusion studies
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| Research Institution | KYUSHU UNIVERSITY |
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Principal Investigator |
WATANABE Hideo Kyushu University, RIAM, Associate Professor, 応用力学研究所, 助教授 (90212323)
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| Co-Investigator(Kenkyū-buntansha) |
YOSHIDA Naoaki Kyushu Uniersity, RIAM, Professor, 教授 (00127317)
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| Project Period (FY) |
2003 – 2005
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| Project Status |
Completed (Fiscal Year 2005)
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| Budget Amount *help |
¥3,300,000 (Direct Cost: ¥3,300,000)
Fiscal Year 2005: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 2004: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 2003: ¥2,300,000 (Direct Cost: ¥2,300,000)
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| Keywords | Low activation alloy / Vanadium alloy / Electron Microscopy / Titanium oxides / Laser Welding / Ion Irradiation / Neutron Irradiation / レーザ溶接 / 材料開発 / 溶接 / 溶融部 / 転位密度 / 転位ループ |
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| Research Abstract |
High purity V-4Cr-4Ti alloy, fabricated by National Institute for Fusion Science (NIFS), was used for this study. The samples were annealed at 1273K for 2 hours and bead-on-plate welds were performed using high purity argon gas. A 2.4MeV copper ion irradiation was carried out with the tandem accelerator at Kyushu University. The TEM samples were sliced from the welded materials and irradiated at 573K and 873K up to the dose of 12 dpa. The microstructure before irradiation showed that relatively large Ti(C, O, N) precipitates which were commonly observed in V-4Cr-4Ti alloy disappeared in the center of weld metal. After the ion irradiation at 873K, fine titanium oxides with {100} habit plane were detected at the dose of 0.75 dpa. Lower number density of the oxides was observed in the base metal after the same irradiation conditions. This means that the contribution of oxygen atoms, which dissolved from the large precipitates during the laser welding, is essential to the microstructural evolution of welded V-4Cr-4Ti alloys.
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