Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 442, Issue 1-2, Pages 466-470Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2006.02.226
Keywords
electromagnetic acoustic resonance; low-carbon steel; fatigue damage; dislocation damping
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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.
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