Clarification of Embrittlement and Degradation Mechanisms of NuclearSteel Materials by Advanced Nano-Materials Science for Control and Prediction of theMaterials Integrity

2009 Fiscal Year Final Research Report

• Project/Area Number: 17002009
• Research Category: Grant-in-Aid for Specially Promoted Research
• Allocation Type: Single-year Grants
• Review Section: Science and Engineering; Engineering
• Research Institution: Tohoku University
• Principal Investigator: HASEGAWA Masayuki Tohoku University, サイクロトロン・ラジオ・アイソトープセンター, 名誉教授 (80005975)
• Co-Investigator(Kenkyū-buntansha): NAGAI Yasuyoshi 東北大学, 金属材料研究所, 教授 (10302209) ; HATAKEYAMA Masahiko 東北大学, 金属材料研究所, 助教 (30375109) ; TOYAMA Takeshi 東北大学, 金属材料研究所, 助教 (50510129) ; MATSUKAWA Yoshitaka 東北大学, 金属材料研究所, 助教 (70566356)
• Project Period (FY): 2005 – 2009
• Keywords: 原子炉圧力容器 / 照射脆化 / 陽電子消滅 / 3次元アトムプローブ

Research Abstract

Combined using advanced positron annihilation and atom probe methods, we have revealed detailed formation and evolution of nanostructures, such as impurity-solute clusters of Cu and MnNiSi, defects and impurity segregation at grain boundaries, in nuclear reactor pressure vessels (RPVs) during long-term irradiation to clarify mechanisms of irradiation-induced degradation (embrittlement) of RPVs. Based on them we have discussed changes in the mechanical properties and make a suggestion about control and prediction of the irradiation-induced degradation.

Research Products

• [Journal Article] Effects of chemical composition and dose on microstructure evolution and hardening of neutron irradiated reactor pressure vessel steels (2010)
  • Author(s): T. Takeuchi, A. Kuramoto, J. Kameda, T. Toyama, Y. Nagai, M. Hasegawa, T. Ohkubo, T. Yoshiie, Y. Nishiyama, K. Onizawa
  • Journal Title: J. Nucl. Mater. (in press)
  • Peer Reviewed
• [Journal Article] Use of the Frank-Bilby equation for calculating misfit dislocation arrays in interfaces (2010)
  • Author(s): J.B. Yang, Y. Nagai, M. Hasegawa
  • Journal Title: Scripta Mater. 62 Pages: 458-461
  • Peer Reviewed
• [Journal Article] A crystallographic model of fcc/bcc martensitic nucleation and growth (2010)
  • Author(s): J.B. Yang, Z.G. Yang, Y. Nagai, M. Hasegawa
  • Journal Title: Acta Mater. 58 Pages: 1599-1606
  • Peer Reviewed
• [Journal Article] Positron annihilation studies of the interaction between oxygen impurities and nanovoids in neutron-irradiated vanadium (2010)
  • Author(s): Z. Tang, T. Rewcharoon, Y. Nagai, M. Hasegawa
  • Journal Title: Acta Mater. 58 Pages: 1868-1875
  • Peer Reviewed
• [Journal Article] Atomic scale modeling of {110} twist grain boundaries in α-iron: Structure and energy Properties (2010)
  • Author(s): J.B. Yang, Y. Nagai, M. Hasegawa, Yu.N. Osetsky
  • Journal Title: Phil. Mag. 90 Pages: 991-1000
  • Peer Reviewed
• [Journal Article] Interactions between Fermi surfaces and Brillouin zone boundaries and phase stability of embedded metallic nanoparticles (2009)
  • Author(s): Y. Nagai, T. Toyama, Z. Tang, K. Inoue, T.Chiba, M. Hasegawa, S. Hirosawa, T. Sato
  • Journal Title: Phys. Rev. B 79 Pages: 201405-1～4(R)
  • Peer Reviewed
• [Journal Article] Shape deformation by moving a glissile interface with one set of misfit dislocations (2009)
  • Author(s): J. B. Yang, Z. G. Yang, Y. Nagai, M. Hasegawa
  • Journal Title: Phil. Mag. Lett. 89 Pages: 605-613
  • Peer Reviewed
• [Journal Article] Quantization of the Frank-Bilby equation for misfit dislocation arrays in interfaces (2009)
  • Author(s): J.B. Yang, Y. Nagai, Z.G. Yang, M. Hasegawa
  • Journal Title: Acta Mater. 57 Pages: 4874-4881
  • Peer Reviewed
• [Journal Article] 陽電子量子ドット閉じ込めを利用したFe中Cuナノ析出物の寸法評価法の開発 (2009)
  • Author(s): 外山健、永井康介、唐政、井上耕治、千葉利信、長谷川雅幸、大久保忠勝、宝野和博
  • Journal Title: 鉄と鋼 95 Pages: 118-123
  • Peer Reviewed
• [Journal Article] Size-Dependent Momentum Smearing Effect of Positron Annihilation Radiation in Embedded Nano Cu Clusters (2008)
  • Author(s): Z . Tang, T. Toyama, Y. Nagai, K. Inoue, Z. Q. Zhu, M. Hasegawa
  • Journal Title: J. Phys. 20 Pages: 445203-1~5
  • Peer Reviewed
• [Journal Article] Nanostructural evolution in surveillance test specimens of commercial nuclear reactor pressure vessel studied br three dimensional atom prove and positron annihilation (2007)
  • Author(s): T. Toyama, Y. Nagai, Z. Tang, M. Hasegawa, A. Almazouzi, E. vav Walle, R. Gerard
  • Journal Title: Acta Mater. 55 Pages: 6852-6860
  • Peer Reviewed
• [Journal Article] 最新のナノ組織解析技術による脆化機構の解明 -陽電子消滅法と3次元アトムプローブによる監視試験片の解析- (2007)
  • Author(s): 永井康介、外山健、長谷川雅幸
  • Journal Title: 金属 77 Pages: 1333 - 1338
• [Journal Article] Phil. Mag. (2005)
  • Author(s): M. Hasegawa, Z. Tang, Y. Nagai, T. Chiba, E. Kuramoto, M. Takaneka
  • Journal Title: Irradiation Induced Vacancy and Cu Aggregations in Fe-Cu Model Alloys of Reactor Pressure Vessel Steels: State-of-the-Art Positron Annihilation Spectroscopy 85 Pages: 467-478
  • Peer Reviewed
• [Journal Article] Phys. Rev. Lett. (2005)
  • Author(s): Z . Tang, Y. Nagai, K. Inoue, T. Toyama, T. Chiba, M. Saito, M. Hasegawa
  • Journal Title: Self-energy correction to momentum-density distribution of a positron-electron pair 94 Pages: 106402-1～4
  • Peer Reviewed
• [Journal Article] Kinetic of irradiation-induced Cu precipitation in nuclear reactor pressure vessel steels (2005)
  • Author(s): Y. Nagai, T. Toyama, Y. Nishiyama, M. Suzuki, Z. Tang, M. Hasegawa
  • Journal Title: Appl. Phys. Lett. 87 Pages: 261920-1～3
  • Peer Reviewed
• [Presentation] ナノ構造変化の解明に基づいた原子炉材料の劣化予測の重要性 (2010)
  • Author(s): 永井康介
  • Organizer: 日本物理学会第65回年次大会
  • Place of Presentation: 岡山大学
  • Year and Date: 2010-03-22
• [Presentation] Positron and the Other Methods for Nasnostructural Studies of Nuclear Reactor Materials (2009)
  • Author(s): M. Hasegawa, Y. Nagai, T. Toyama, K. Inoue, Z. Tang, J. Yang, A. Almazouzi, E. Van Walle, R. Gerard, Y. Nishiyama, M. Suzuki, T. Ohkubo
  • Organizer: ICPA-15
  • Place of Presentation: Kolkata, India.
  • Year and Date: 2009-01-22
• [Presentation] 3D-AP Analysis Coupled with PAS Measurements for Nano-clusters Observation in RPV Steels and Their Model Alloys (2008)
  • Author(s): Y. Nagai, T. Toyama, A. Almazouzi, M. Hasegawa, E. van Walle, R. Gerard
  • Organizer: MRS 2008 Fall Meeting
  • Place of Presentation: Boston, USA.
  • Year and Date: 2008-12-01
• [Presentation] Electron Momentum-Density Distributions of Cu Precipitates in Fe-Cu Alloys: A Quantum Size Effect in Momentum Spaces (2008)
  • Author(s): Z. Tang, T. Toyama, Y. Nagai, K. Inoue, T. Ohkubo, M. Hasegawa
  • Organizer: Int. Workshop on Positron Studies of Defects (PSD-8)
  • Place of Presentation: Praha, Czech Republic.
  • Year and Date: 2008-09-03
• [Presentation] Combination of Positron Annihilation and Three-dimensional Atom Probe for Detects and Materials Studies (2008)
  • Author(s): Y. Nagai, T. Toyama, A. Almazozuzi, Z. Tang, K. Inoue, K. Takadate, H. Ohkubo, M. Hasegawa, E. van Walle, R. Gerard, H. Sunaga, H. Takizawa
  • Organizer: Int. Workshop on Positron Studies of Defects (PSD-8)
  • Place of Presentation: Praha, Czech Republic
  • Year and Date: 2008-09-02
• [Presentation] Positron Diffusion and Trapping: Its Application to Study of Embedded Nano-Particles in Metals (2007)
  • Author(s): Y.Nagai, K. Inoue, A. Tsuto, Z. Tang, M. Hasegawa
  • Organizer: The 11th Int. Workshop on Slow Positron Beam Techniques for Solids and Surfaces, (SLOPOS-11)
  • Place of Presentation: Orelean, France
  • Year and Date: 2007-07-11
• [Presentation] Positron Annihilation Spectroscopy Experiments and Applications (2006)
  • Author(s): Y. Nagai
  • Organizer: International School on Experimental Quantification of Irradiation Damage(ISQUID) Summer school Auberge de la Ferme
  • Place of Presentation: Rochehaut, Belgium
  • Year and Date: 2006-09-27
• [Presentation] 陽電子消滅法と3次元アトムプローブ法による実機監視試験片の解析 (2006)
  • Author(s): 永井康介、外山健、長谷川雅幸、A.Almazouzi、E. van Walle、大久保忠勝、宝野和博
  • Organizer: 日本金属学会2006年秋期大会
  • Place of Presentation: 新潟大学
  • Year and Date: 2006-09-16
• [Presentation] Electronic structure of embedded metallic nano-clusters (2006)
  • Author(s): Y. Nagai, T. Toyama, Z. Tang, K. Inoue, T. Chiba, M. Hasegawa, S. Hirosawa, T. Sato
  • Organizer: The 14th International Conference on Positron Annihilation
  • Place of Presentation: Hamilto, Canada.
  • Year and Date: 2006-07-25
• [Presentation] Temperature Dependence of Strengthening by Nano Cu Precipitates in a Thermally Aged Fe-Cu Alloy (2006)
  • Author(s): M. Hasegawa, Y. Ito, M. Hatakeyama, Y. Nagai, Z. Tang, Y. N. Osetskiy
  • Organizer: Plasticity 2006
  • Place of Presentation: Halifax, Canada
  • Year and Date: 2006-07-19
• [Remarks]
  • URL: http://wani.imr.tohoku.ac.jp