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Ion-beam-assisted characterization of quinoline-insoluble particles in nuclear graphite

nuclear Science and Techniques 2020年第10期31卷 23-32页

作者： Qing Huang Xin-Qing Han Peng Liu Jian-Jian Li Guan-Hong Lei Cheng Li Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201800China School of Physics State Key Laboratory of Crystal MaterialsKey Laboratory of Particle Physics and Particle Irradiation(MOE)Shandong UniversityJinan 250100China

The irradiation behavior of graphite is essential for its applications in the nuclear ***,the behavioral differences of graphite remain obscure because of the very limited comprehension of its microstructural *** typical structure,the quinoline-insoluble(QI)particle,was investigated using IG-110 and NBG-18 *** irradiation,the QI particles on the polished surface were proven to become hillocks,which were easily identifiable via scanning electron microscopy(SEM).Thus,a method that combined ion irradiation and SEM characterization was proposed to study the distribution and concentration of QI particles in *** irradiation,the QI particles were found to evolve into densified spheres,which were weakly bonded with the surrounding graphite structures,thereby indicating that the densification of QI particles did not evidently contribute to graphite dimensional shrinkage.A much higher concentration of QI particles in NBG-18 than IG-110,which was suggested to be responsible for the smaller maximum dimensional shrinkage of former over the latter during irradiation,was characterized.

关键词： Heavy ion irradiation nuclear graphite Quinoline insoluble Microstructure

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An Uncertainty Evaluation on the ΔK_(th) and ΔK_(IC) of Fine-grained Isotropic graphite

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Acta Mechanica Solida Sinica 2024年第3期37卷 478-486页

作者： Yantian Zhang Lina Zhu Ruiguo Yan Xishu Wang Department of Engineering Mechanics Tsinghua UniversityBeijing100084China Wheel-Rail Center Tianjin Research Institute for Advanced EquipmentTsinghua UniversityTianjin300300China

This paper intensively explores the critical issues related to the quantitative and accurate evaluations of FCG behavior in the early stage,macro fatigue fracture toughness,and the critical crack size for damage tolerance in nuclear *** address these issues,scale-span FCG tests were carried out using two typical specimens,CT and SEM in-situ *** results indicate that the FCG threshold and the effective FCG length have a significant correlation with the modified maximum loop stress theory for a mixed I/II *** particular,the effective FCG length(a_(eq))and the applied stress threshold of polycrystalline graphite are important parameters for fatigue damage tolerance design in engineering *** influencing factors of ΔK_(th,eq) and a_(eq) were discussed in detail using the mixed I/II mode,*** addition,the scattered values of ΔK_(IC) for this graphite can be quantitatively estimated using the Weibull distribution *** predicated parameters and experimental results demonstrate a strong correlation.

关键词： nuclear graphite Mixed I/II mode Fatigue crack Fatigue crack growth threshold Fatigue fracture toughness

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