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Hardening of an ODS Ferritic Steel after Helium Implantation and Thermal Annealing

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Chinese Physics Letters 2018年第5期35卷 82-86页

作者： Chang-Hao Su Chong-Hong Zhang Yi-Tao Yang Zhao-Nan Ding Yu-Guang Chen akihiko kimura Institute of Modern Physics Chinese Academy of Sciences Lanzhou 730000 University of Chinese Academy of Sciences Beijing 100049 Institute of Advanced Energy Kyoto University Kyoto 611-0011 Japan

Specimens of an oxide dispersion strengthened（ODS） ferritic steel（15 Cr-4 Al-0.6 Zr-0.1 Ti） are implanted with multiple-energy He ions at room temperature to create a damage plateau of 0.4 dpa for the average（corresponding to an He concentration of about 7000 appm） from the near surface to a depth about 1 um. The specimen is subsequently thermally annealed at 800°C for 1 h in a vacuum so that simple defects can be formed in the as-implanted state that has undergone significant recombination, meanwhile helium bubbles at nano-scale are formed. Hardness of the specimens are tested with the nano-indentation technique. A hardening by 25% is observed. Microstructures of the specimen after irradiation/annealing are investigated with transmission electron microscopy. Helium bubbles are generally located at dislocations and grain boundaries. Using the dispersed barrier strength model, the strength factor of helium bubbles in the ODS ferritic steel is estimated to be between0.1 and 0.26, which is close to that of helium bubbles in austenitic steels.

关键词： Cr ODS Hardening of an ODS Ferritic Steel after Helium Implantation and Thermal Annealing

Hardening of ODS Ferritic Steels under Irradiation with High-energy Heavy Ions

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IMP & HIRFL Annual Report 2017年第1期 121-123页

作者： Ding Zhaonan Zhang Chonghong Yang Yitao Song Yin Zhang Xianlong akihiko kimura Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000China Institute of Advanced Energy Kyoto UniversityKyotoJapan

Influence of the nanoscale oxide particles on mechanical properties and irradiation resistance of oxide-dispersionstrengthened(ODS)ferritic steels is of critical importance for the use of the material in fuel cladding or blanket components in advanced nuclear *** the present work,impact of structures of oxide dispersoids on the irradiation hardening of ODS ferritic steels was *** of three kinds of high-Cr ODS ferritic steels containing oxide dispersoids with different number density and average size were irradiated with high-energy Niions at about−50℃.The energy of the incident Ni ions was varied from 12.73 to 357.86 MeV by using an energy degrader at the terminal so that a plateau of atomic displacement damage(∼0.8 dpa)was produced from the near surface to a depth of 24m in the specimens.

关键词： cladding resistance energy

Hardening of an ODS Ferritic Steel after Helium Implantation and Thermal Annealing

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IMP & HIRFL Annual Report 2017年第1期 125-127页

作者： Su Changhao Zhang Chonghong Yang Yitao Ding Zhaonan Chen Yuguang and akihiko kimura Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000China University of Chinese Academy of Science Beijing 100049China Institute of Advanced Energy Kyoto UniversityUjiKyoto 611-0011Japan

In advanced nuclear reactors,helium can inevitably be produced via(n,)reaction and may precipitate into nano-scale helium bubbles in materials,and can causes degradation of material *** the present study,effects of helium bubbles formation in an oxide dispersion strengthened(ODS)steel is *** of an ODS ferritic steel(15Cr-4Al-0.6Zr-0.1Ti)were implanted with mutiple-energy He ions at room temperature at the terminal of the 320 kV High-voltage Platform in IMP,to create a damage plateau of 0.4 dpa for average(corresponding to an He concentration of about 7000 appm)from the near surface to a depth about 1*** specimen was subsequently thermally annealed at 800℃for 1 h in vacuum so that simple defects formed in the as-implanted state underwent significant recombination,meanwhile helium bubbles at nano-scale were formed.

关键词： steel strengthened annealed

载能离子辐照的ODS铁素体钢硬化效应的研究

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原子核物理评论 2015年第1期32卷 95-99页

作者：张恒庆张崇宏宋银杨义涛孟彦成张丽卿缑洁 Jinsung Jang akihiko kimura 中国科学院近代物理研究所兰州730000 KOREA ATOMIC ENERGY RESEARCH INSTITUTE Institute of ADVANCED Energy KYOTO UNIVERSITY

研究了氧化物弥散强化(ODS)的3种铁素体钢,包括:19Cr-3.5AlODS钢(MA956),16Cr-0.1TiODS和16Cr-0.1ZrODS铁素体钢,在多能量的氦离子和MeV能量级的Bi、Xe离子辐照条件下的硬化效应。获得了辐照硬化与原子离位损伤水平(dpa)、He注入浓度的... 详细信息

研究了氧化物弥散强化(ODS)的3种铁素体钢,包括:19Cr-3.5AlODS钢(MA956),16Cr-0.1TiODS和16Cr-0.1ZrODS铁素体钢,在多能量的氦离子和MeV能量级的Bi、Xe离子辐照条件下的硬化效应。获得了辐照硬化与原子离位损伤水平(dpa)、He注入浓度的关系。结果表明,材料的硬度在低剂量范围会随着辐照剂量迅速增加,而在高剂量范围材料的硬度逐渐趋于饱和,可以用1/2次的幂函数拟合辐照硬化与离位损伤水平之间的关系。不同入射离子——Bi离子和Xe离子都会引起ODS钢的硬化,而氦离子还会在材料中聚集导致氦泡的形成,造成更加明显的硬化。实验证明,Ti或Zr掺杂的16Cr-ODS铁素体钢较19Cr-3.5AlODS钢具有更强的抗辐照硬化能力,原因可归于其含有更高数密度的细小氧化物粒子——能够有效俘获点缺陷和氦原子,从而有效抑制晶粒内部和晶界出缺陷的长大。

关键词： ODS钢氦注入重离子辐照硬化

Annealing Behavior of Hardening and Ductility Loss of a 16Cr-4Al ODS Ferritic Steel Irradiated with High Energy Ne Ions

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IMP & HIRFL Annual Report 2019年第1期 127-127页

作者： Chen Yuguang Zhang Chonghong akihiko kimura Institute of Modern Physics Chinese Academy of SciencesLanzhou730070 China Institute of Advanced Energy Kyoto UniversityKyotoJapan

Aluminum-added Oxide-Dispersion-Strengthened(ODS)ferritic steel is the prime candidate for the fuel cladding of the accident-tolerant fuel *** in-pile condition,the fuel cladding has to endure the intensive radiation ... 详细信息

关键词： cladding steel technology.

Visible light responsive photocatalysts developed by substitution with metal cations aiming at artificial photosynthesis

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Frontiers in Energy 2021年第3期15卷 568-576页

作者： Yuichi YAMAGUCHI akihiko KUDO Department of Applied Chemistry Faculty of ScienceTokyo University of ScienceTokyo 162-8601Japan

To solve resource,energy,and environmental issues,development of sustainable clean energy system is strongly *** recent years,hydrogen has been paid much attention to as a clean *** hydrogen production by water splitting using a photocatalyst as artificial photosynthesis is a promising method to solve these *** utilization of visible light comprised of solar light is essential for practical *** strategies,i.e.,doping,control of valence band,and formation of solid solution are often utilized as the useful methods to develop visible light responsive *** minireview introduces the recent work on visible-light-driven photocatalysts developed by substitution with metal cations of those strategies.

关键词： visible light responsive photocatalyst water splitting artificial photosynthesis:metal ion substitution

Remarks on Herz-Type Hardy Spaces Dedicated to Professor Kozo Yabuta on the occasion of his 60th birthday

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Acta Mathematica Sinica,English Series 2001年第2期17卷 339-360页

作者： akihiko MIYACHI Department of Mathematics Tokyo Woman's Christian University. 2-6-1 Zempukuji. Suginami-ku. Tokyo 167-8585. JAPAN

Basic properties of the Herz-type Hardy spaces HKqa,p, such as the boundedness of singular integral operators and the fractional integration operators, atomic decomposition, dense subspaces, etc., are established in t... 详细信息

关键词： Herz-type Hardy space Singular integral Flactional integration Multilinear operator.

Simeprevir with peginterferon and ribavirin induced interstitial pneumonitis:First case report

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World Journal of Gastroenterology 2015年第3期21卷 1009-1013页

作者： Katsuyoshi Tamaki akihiko Okubo Department of Hepatology Tourai-kai Okubo HospitalTokushima 770-0923Japan Department of Respirology Tourai-kai Okubo HospitalTokushima 770-0923Japan

The effectiveness of hepatitis C treatment has improved with the development of interferon(IFN),and it has drastically improved with the development of peg-interferon-α(PEG-IFN) in combination with ribavirin(RBV) and,more recently,with the addition of a protease ***,which is a secondgeneration protease inhibitor,has shown clinically favorable safety and tolerability *** received its first global approval in Japan in September 2013 for the treatment of genotype 1 chronic hepatitis C in combination with PEG-IFN and *** serious adverse event associated with IFN therapy is interstitialpneumonitis,which can be *** experienced a patient with interstitial pneumonitis that was induced by simeprevir with PEG-IFN and RBV therapy for chronic hepatitis C in the early stages of therapy(8 wk after initiating therapy).This is the first case report of interstitial pneumonitis with simeprevir with PEG-IFN and RBV in the *** addition,it is very interesting that the onset of interstitial pneumonitis was earlier than that in conventional PEG-IFN and RBV *** finding suggests that simeprevir augments the adverse *** present this case report in light of relevant literature on interstitial pneumonitis with conventional PEG-IFN and RBV therapy.

关键词： Simeprevir Chronic hepatitis C Interstitial pneumo

Households' Risk Perception and Behavioral Responses to Natech Accidents

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International Journal of Disaster Risk Science 2017年第1期8卷 1-15页

作者： Junlei Yu Ana Maria Cruz akihiko Hokugo School of Humanities and Social Science Nanyang Technological University Disaster Prevention Research Institute Kyoto University Research Center for Urban Safety and Security Kobe University

This study analyzes data on households' risk perception and protective behavior following a natural disaster triggered technological accident(Natech accident)that occurred at an industrial park in Sendai during the Great East Japan Earthquake and Tsunami, on 11 March2011. The results indicate that some households carried out multiple evacuations and that households' risk perceptions changed throughout the Natech accident evacuation process. Risk perception differed according to household location and demographic characteristics. We also found differences in the protective measures adopted for households in different locations. Specifically, those living closer to the Natech accident tended to evacuate immediately,whereas those living further away tended to shelter in place. Wind direction is discussed as a factor that influences households' risk perception and evacuation response to a Natech accident. The findings of this study advance knowledge of household behavior in response to a Natech accident and can assist emergency managers in developing strategies for better management of evacuation processes.

关键词： Evacuation behavior Great East Japan Earthquake and Tsunami Natech accidents Protective actions Risk perception