Ultrasonic attenuation and microstructural evolution throughout tension-compression fatigue of a low-carbon steel

被引：24
|
作者：
Ohtani, T.
Nishiyama, K.
Yoshikawa, S.
Ogi, H.
Hirao, M.
机构：
[1] Ebara Res Co Ltd, Mat Lab, Fujisawa, Kanagawa 2518502, Japan
[2] Ebara Corp, High Pressure Pump Engn Dept, Tokyo 1448510, Japan
[3] Osaka Univ, Grad Sch Engn Sci, Osaka 5608531, Japan
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2006年 / 442卷 / 1-2期
关键词：
electromagnetic acoustic resonance; low-carbon steel; fatigue damage; dislocation damping;
D O I：
10.1016/j.msea.2006.02.226
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
We have studied the microstructural evolution in a wrought low-carbon steel (ASTM-AI05), containing 0.21 mass% C and subjected to tension-compression cyclic loading, through in situ monitoring of the attenuation and velocity of a surface shear-wave with the electromagnetic acoustic resonance (EMAR) technique. This technique is a combination of the resonant technique and a non-contacting electromagnetic acoustic transducer (EMAT). The EMAT operates with a magnetostrictive mechanism and it is the key to establishing a non-contacting monitoring of microstructural change in a material's surface region with high sensitivity. The attenuation coefficient is sensitive to the accumulated fatigue damage, showing two peaks around 2% and 90% of life. This novel phenomenon is interpreted in terms of dislocation mobility change and dislocation rearrangement. Transmission electron microscope (TEM) observation has supported this view. This technique has a potential to assess damage and predict the fatigue life of steels. (c) 2006 Elsevier B.V. All rights reserved.
引用
收藏
页码：466 / 470
页数：5
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