The Effect of the Grain Size of Divertor’s Cooling Pipe on the Capability of High-Frequency Ultrasonic Tests to Evaluate the Quality of the Bond between Divertor’s Cooling Pipe and Armor

DOI Web Site 参考文献17件
  • FARIDAFSHIN Mohammadjavad
    Department of Quantum Science and Energy Engineering, Graduate School of Engineering, Tohoku University
  • YUSA Noritaka
    Department of Quantum Science and Energy Engineering, Graduate School of Engineering, Tohoku University
  • SUZUKI Ryouji
    Nondestructive Evaluation Center, Japan Power Engineering and Inspection Corporation
  • FURUKAWA Takashi
    Nondestructive Evaluation Center, Japan Power Engineering and Inspection Corporation
  • TOKITANI Masayuki
    National Institute for Fusion Science
  • MASUZAKI Suguru
    National Institute for Fusion Science

抄録

<p>This study evaluated the effect of the grain size of the divertor’s cooling pipe on the capability of high-frequency ultrasonic tests to evaluate the quality of the bonded interface between the divertor’s cooling pipe and armor. First, simple oxygen-free copper and copper-chromium-zirconium block samples with different grain sizes were prepared and measured by an ultrasonic microscope with a 35 MHz probe. The results of the measurements confirmed that the non-uniformity of backwall echoes increased with the grain size of the samples. Samples with large grains provided distinctive signals that can be clearly confirmed on the ultrasonic C-scan images. Subsequently, two bonded samples consisting of 2.5 mm oxygen-free copper bonded with a block of pure tungsten that meets the material specifications of tungsten for ITER component which mimicked the basic design of a divertor’s cooling pipe and a monoblock, were measured to evaluate their bonded interfaces. One of the bonded samples bonded at a high temperature provided distinctive signals due to the enlargement of the grain of the oxygen-free copper. Results confirmed that the grain enlargement is the reason for reduced defect detection capability of the high-frequency ultrasonic tests as was suggested previously. This study also revealed that the enlargement of grain caused by improper manufacturing would be non-destructively detectable by high-frequency ultrasonic tests.</p>

収録刊行物

  • Plasma and Fusion Research

    Plasma and Fusion Research 18 (0), 2405068-2405068, 2023-08-10

    一般社団法人 プラズマ・核融合学会

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