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
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- FARIDAFSHIN Mohammadjavad
- Department of Quantum Science and Energy Engineering, Graduate School of Engineering, Tohoku University
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- YUSA Noritaka
- Department of Quantum Science and Energy Engineering, Graduate School of Engineering, Tohoku University
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- SUZUKI Ryouji
- Nondestructive Evaluation Center, Japan Power Engineering and Inspection Corporation
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- FURUKAWA Takashi
- Nondestructive Evaluation Center, Japan Power Engineering and Inspection Corporation
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- TOKITANI Masayuki
- National Institute for Fusion Science
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- MASUZAKI Suguru
- National Institute for Fusion Science
説明
<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
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- Plasma and Fusion Research
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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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詳細情報 詳細情報について
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- CRID
- 1390015664209344384
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- ISSN
- 18806821
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- Crossref
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- 抄録ライセンスフラグ
- 使用不可