著者

小川 渉 菖蒲 敬久 筧 瑞恵 鞍谷 文保 小出 俊雄 文珠 義之 水田 泰次

出版者

公益社団法人 日本金属学会

雑誌

日本金属学会誌 (ISSN:00214876)

巻号頁・発行日

vol.83, no.4, pp.128-135, 2019-04-01 (Released:2019-03-25)

参考文献数

9

被引用文献数

3 3

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Cymbals are percussion musical instruments with a simpler structure than other musical instruments. Therefore, their material composition basically decides the sound quality and decay time rather than the skill of the player. In this study, specimens of cymbals to which Titanium, Zirconium and Iron were added were prepared. From the difference of diffraction rings by synchrotron radiation X-rays, the crystal structure of the specimens of cymbals prepared by various manufacturing processes was analyzed in order to investigate the relationship between the crystal structure associated with the material and manufacturing process used and the damping of the sound of cymbals. As a result, it was found that the changes in the crystal structure were due to the manufacturing process used. In addition, it was clarified that the changes affected the damping of the sound of cymbals.

著者

横田 哲士 中村 浩 多田 弘幸 菖蒲 敬久 片山 聖二 川人 洋介 近藤 勝義 吉田 悟 今井 久志 川上 博士 富沢 雅美 中島 裕也

出版者

一般社団法人 溶接学会

雑誌

溶接学会全国大会講演概要

巻号頁・発行日

vol.2015, pp.158-159, 2015

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溶接における重大欠陥のひとつである割れの発生機構の解明は重要な課題である.大型放射光施設Spring8を用いてX線位相差法による透過観察およびレーザ溶接時における割れの発生過程の撮影を行い,割れの発生速度や割れ発生時に周辺で起こる溶融池の変化について報告する.

著者

久保田 佳基 秦野 正治 菖蒲 敬久 森 茂生

出版者

日本結晶学会

雑誌

日本結晶学会誌 (ISSN:03694585)

巻号頁・発行日

vol.58, no.6, pp.273-278, 2016-12-31 (Released:2017-01-06)

参考文献数

15

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In-situ synchrotron diffraction experiments were conducted in order to clarify the formation process of α'-martensite from the γ-phase induced by external strain, combined with Lorentz transmission electron microscopy (TEM) and high-resolution TEM observations. Lorentz TEM observation revealed that α'-martensite exist near the defect structures such as dislocations and stacking faults in the parent γ-phase. In addition, it is clearly demonstrated that ε-martensite with hexagonal symmetry appears as an intermediate phase during the plastic deformation of SUS304 stainless steel. Our experimental results suggested that the interfaces between twin structures of the γ-phase presumably play a crucial role in the formation of ε-martensite.