<i>In situ</i> magnetic measurements under neutron radiation in Fe metal and low carbon steel

DOI PDF 被引用文献4件 オープンアクセス
  • S. Takahashi
    Iwate University Nondestructive Evaluation and Science Research Center, Faculty of Engineering, , Morioka 020-8551, Japan
  • H. Kikuchi
    Iwate University Nondestructive Evaluation and Science Research Center, Faculty of Engineering, , Morioka 020-8551, Japan
  • K. Ara
    Iwate University Nondestructive Evaluation and Science Research Center, Faculty of Engineering, , Morioka 020-8551, Japan
  • N. Ebine
    Japan Atomic Energy Agency Department of Reactor Safety Research, , Tokai, Ibaraki 319-1195, Japan
  • Y. Kamada
    Iwate University Nondestructive Evaluation and Science Research Center, Faculty of Engineering, , Morioka 020-8551, Japan
  • S. Kobayashi
    Iwate University Nondestructive Evaluation and Science Research Center, Faculty of Engineering, , Morioka 020-8551, Japan
  • M. Suzuki
    Japan Atomic Energy Agency Department of Reactor Safety Research, , Tokai, Ibaraki 319-1195, Japan

書誌事項

公開日
2006-07-15
DOI
  • 10.1063/1.2214214
公開者
AIP Publishing

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<jats:p>Magnetic minor hysteresis loops of low carbon steel and Fe metal have been measured during neutron radiation at 563K in a 50MW nuclear reactor. For investigation of nucleation mechanism of copper precipitates and dislocation loops during neutron radiation, special attention was paid to minor-loop coefficients, which are deduced from simple relations between minor-loop parameters and are very sensitive to lattice defects such as dislocations, copper precipitates, and grain boundaries. We found that with increasing neutron fluence, the minor-loop coefficients of low carbon steel sharply increase and show a maximum at the fluence of 1×1019cm−2, followed by a slow decrease. The appearance of the maximum suggests the presence of two mechanisms of internal stress; while copper precipitates and dislocation loops in the matrix make the internal stress increase, those grown in the vicinity of dislocations compensate the internal stress of dislocations so as to minimize the elastic energy. On the other hand, the minor-loop coefficients show a monotonic increase with neutron fluence in Fe metal where dislocation loops play an important role for the brittleness.</jats:p>

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