2016 Fiscal Year Annual Research Report
酸化物分散強化鋼の高温照射環境下における強度劣化とその機構の解明
| Project/Area Number |
14F04903
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| Research Institution | Tohoku University |
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Principal Investigator |
佐藤 裕樹 東北大学, 金属材料研究所, 准教授 (20211948)
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| Co-Investigator(Kenkyū-buntansha) |
LI YANFEN 東北大学, 金属材料研究所, 外国人特別研究員
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| Project Period (FY) |
2014-04-25 – 2017-03-31
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| Keywords | 原子力材料 / 酸化物分散強化鋼 / クリープ強度 / 微細組織変化 / ヘリウム注入 / 高温熱処理 / ナノ粒子 |
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| Outline of Annual Research Achievements |
We studied microstructural evolution and mechanical properties change of an oxide dispersion strengthened steel (12Cr-ODS) for nuclear application.
The effect of high-temperature annealing at 1473-1673 K on the coarsening kinetics of nanoparticles and microstructural evolution was systematically investigated. The nanoparticles were extremely stable and continued precipitating during annealing at 1473 K, whereas, significant coarsening took place during exposure at 1673 K. Furthermore, heterogeneously distributed voids were developed, sizes of which increased distinctly at 1573 and 1673 K for longer holding time. This is probably due to the growth and/or aggregation of Ar-entrapped and pre-existed voids in the as-fabricated condition. Additionally, no obvious changes were observed in texture at 1473 K, except that its intensity reduced. The hardness slightly decreased at 1473 K up to 24 h, however, obvious reduction was observed after annealing at 1573 and 1673 K for more than 6 h.
The helium implantation experiments were carried out in cyclotron accelerator in Tohoku University. The implanted helium reached 390 μm from the surface, and concentration was 35 and 70 appm. The creep properties were tested at 873 and 973 K with different stresses. The helium leaded to slight reduction in creep time-to-rupture and strain-to-rupture at 973 K. While it shows almost no effects at 873 k. It indicates that 12Cr-ODS steel has the good resistance to helium irradiation, which was derived from the high number density and dispersed nano-particles.
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| Research Progress Status |
28年度が最終年度であるため、記入しない。
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| Strategy for Future Research Activity |
28年度が最終年度であるため、記入しない。
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Research Products
(13 results)
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[Journal Article] Crystallographic analysis on atomic-plane parallelisms between bcc precipitates and hcp matrix in recrystallized Zr-2.5Nb alloys2017
Author(s)
Y. Matsukawa, I. Okuma, H. Muta, Y. Shinohara, R. Suzue, H.L. Yang, T. Maruyama, T. Toyama, J.J. Shen, Y.F. Li, Y. Satoh, S. Yamanaka, H. Abe
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Journal Title
Acta Materialia
Volume: 126
Pages: 86-101
DOI
Peer Reviewed
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[Journal Article] Reassessment of oxidation-induced amorphization and dissolution of Nb precipitates in Zr－Nb nuclear fuel cladding tubes2017
Author(s)
Y. Matsukawa, S. Kitayama, K. Murakami, Y. Shinohara, K. Yoshida, H. Maeno, H.L. Yang, T. Toyama, K. Yasuda, H. Watanabe, A. Kimura, H. Muta, S. Yamanaka, Y.F. Li, Y. Satoh, S. Kano, H. Abe
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Journal Title
Acta Materialia
Volume: 127
Pages: 153-164
DOI
Peer Reviewed
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[Journal Article] The effect of crystallographic mismatch on the obstacle strength of second phase precipitate particles in dispersion strengthening: bcc Nb particles and nanometric Nb clusters embedded in hcp Zr2016
Author(s)
Y. Matsukawa, H.L. Yang, K. Saito, Y. Murakami, T. Maruyama, T. Iwai, K. Murakami, Y. Shinohara, T. Kido, T. Toyama, Z. Zhao, Y.F. Li, S. Kano, Y. Satoh, Y. Nagai, H. Abe
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Journal Title
Acta Materialia
Volume: 102
Pages: 323-332
DOI
Peer Reviewed
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