\u6570\u304b\u6708\u3076\u308a\u306e\u8ad6\u6587\u53d7\u7406\u901a\u77e5\u304c\u6765\u307e\u3057\u305f\u3002\u8272\u3005\u3068\u3042\u308b\u6bce\u65e5\u3067\u3059\u304c\u3001\u4f55\u304b\u3092\u5f62\u306b\u3057\u3066\u6b8b\u305b\u308b\u3068\u3044\u3046\u306e\u306f\u5b09\u3057\u3044\u3053\u3068\u3067\u3059\u3002<\/p>\n\n\n\n
\u6982\u8981\u306f\u4ee5\u4e0b\u3002<\/p>\n\n\n\n
Title<\/u>: The effect of the grain size of divertor\u2019s cooling pipe on the capability of high-frequency ultrasonic tests to evaluate the quality of the bond between divertor\u2019s cooling pipe and armor<\/p>\n\n\n\n
Abstract<\/u>: This study evaluated the effect of the grain size of the divertor\u2019s cooling pipe on the capability of high-frequency ultrasonic tests to evaluate the quality of the bonded interface between the divertor\u2019s 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 components which mimicked the basic design of a divertor\u2019s 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>\n\n\n\n
<\/p>\n","protected":false},"excerpt":{"rendered":"
\u6570\u304b\u6708\u3076\u308a\u306e\u8ad6\u6587\u53d7\u7406\u901a\u77e5\u304c\u6765\u307e\u3057\u305f\u3002\u8272\u3005\u3068\u3042\u308b\u6bce\u65e5\u3067\u3059\u304c\u3001\u4f55\u304b\u3092\u5f62\u306b\u3057\u3066\u6b8b\u305b\u308b\u3068\u3044\u3046\u306e\u306f\u5b09\u3057\u3044\u3053\u3068\u3067\u3059\u3002 \u6982\u8981\u306f\u4ee5\u4e0b\u3002 Title: The effect of … <\/p>\n","protected":false},"author":2,"featured_media":10161,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2,8,225,14],"tags":[147],"class_list":["post-10157","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-achievement","category-journal","category-pfr","category-student","tag-147"],"jetpack_featured_media_url":"https:\/\/i0.wp.com\/web.tohoku.ac.jp\/yusa\/wp-content\/uploads\/2023\/07\/pfr_faridafshin2023.jpg?fit=144%2C114","_links":{"self":[{"href":"http:\/\/web.tohoku.ac.jp\/yusa\/index.php\/wp-json\/wp\/v2\/posts\/10157","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/web.tohoku.ac.jp\/yusa\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/web.tohoku.ac.jp\/yusa\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/web.tohoku.ac.jp\/yusa\/index.php\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"http:\/\/web.tohoku.ac.jp\/yusa\/index.php\/wp-json\/wp\/v2\/comments?post=10157"}],"version-history":[{"count":5,"href":"http:\/\/web.tohoku.ac.jp\/yusa\/index.php\/wp-json\/wp\/v2\/posts\/10157\/revisions"}],"predecessor-version":[{"id":10182,"href":"http:\/\/web.tohoku.ac.jp\/yusa\/index.php\/wp-json\/wp\/v2\/posts\/10157\/revisions\/10182"}],"wp:featuredmedia":[{"embeddable":true,"href":"http:\/\/web.tohoku.ac.jp\/yusa\/index.php\/wp-json\/wp\/v2\/media\/10161"}],"wp:attachment":[{"href":"http:\/\/web.tohoku.ac.jp\/yusa\/index.php\/wp-json\/wp\/v2\/media?parent=10157"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/web.tohoku.ac.jp\/yusa\/index.php\/wp-json\/wp\/v2\/categories?post=10157"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/web.tohoku.ac.jp\/yusa\/index.php\/wp-json\/wp\/v2\/tags?post=10157"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}