書誌事項
- タイトル別名
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- Change of Ultrasonic Attenuation and Microstructure Evolution in Crept 2.25%Cr-1%Mo Steels.
- 2 25パーセント Cr 1パーセント Mo コウ ノ クリープ ソンショウ ニ トモナウ チョウオンパ ゲンスイ ト ザイリョウ ビシ ソシキ ノ ヘンカ
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We studied microstructure evolution caused by creep in 2.25%Cr-1%Mo steel using ultrasonic attenuation. The material was exposed to the temperature of 923K at various stresses. We used electromagnetic acoustic resonance (EMAR) to measure attenuation. EMAR is a contactless acoustic-resonance method and free from energy losses associated with contact transducer, resulting in the intrinsic attenuation in solids. We used axial-shear-wave EMAT, which transmits and receives SH wave propagating in the circumferential direction of a cylindrical specimen. The attenuation coefficient was obtained from the ringdown curve at the resonance by interrupting the creeping. The attenuation exhibits much larger sensitivity to the damage accumulation than the velocity. Approaching the rapture, the attenuation coefficient becomes five times as large as the initial state. We correlate this attenuation evolution with the microstructure change, especially, the changes in dislocation structure that most contributes to the attenuation change. This is supported by TEM observations. The technique has a potential to assess the damage advance and predict the creep life of metals.
収録刊行物
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- 材料
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材料 51 (2), 195-201, 2002
公益社団法人 日本材料学会
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詳細情報 詳細情報について
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- CRID
- 1390282680369406976
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- NII論文ID
- 110002301853
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- NII書誌ID
- AN00096175
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- COI
- 1:CAS:528:DC%2BD38XhvFOns7c%3D
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- ISSN
- 18807488
- 05145163
- http://id.crossref.org/issn/05145163
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- NDL書誌ID
- 6071554
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- 本文言語コード
- ja
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- データソース種別
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- JaLC
- NDL
- Crossref
- CiNii Articles
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- 抄録ライセンスフラグ
- 使用不可