オーステナイト系ステンレス鋼照射ブロック材を用いた照射下ミクロ組織の非破壊検査技術開発
Development of non-destructive inspection technique for microstructures under irradiation using austenitic stainless steel blocks
著者:
江藤 淳二 Junji ETOH 匂坂 充行 Mitsuyuki SAGISAKA 松永 嵩 Takashi MATSUNAGA 礒部 仁博 Yoshihiro ISOBE フランク ガーナー Frank GARNER 沖田 泰良 Taira OKITA
発刊日:
公開日:
backscatterfast reactorirradiation damagemicrostructurenon-destructive inspectionstructural materialultrasonic
概要
Ultrasonic testing was conducted on two long (218-245 mm), Type 304 stainless steel blocks with a hexagonal cross-section (50 mm face-to-face thickness) that were removed from the reflector region of the decommissioned EBR-II reactor. Ultrasonic testing is one of the widely used non-destructive testing techniques for material characterization. Ultrasonic waves, currently used as a non-destructive technique to detect cracks, change as a result of interacting with microstructural components and can be employed to measure radiation-induced changes in microstructure. The result of quantitative evaluation of the relationship between the microstructure and the ultrasonic signal have a good agreement between ultrasonic measurements and the spatial variations in density changes, as well as swelling arising from microscopy-observed voids. These results clearly demonstrate that ultrasonic techniques can be used to nondestructively measure the microstructures across a thick component.
