2821 電磁超音波共鳴法による低炭素鋼の疲労過程のモニタリング(S37-1 非破壊評価とモニタリング(1),S37 非破壊評価とモニタリング)

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  • 2821 Monitoring of Fatigue Damage in Low-Carbon Steel with Electromagnetic Acoustic Resonance

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We have studied the microstructural evolution in a wrought low-carbon steel (ASTM-A105), 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.

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