Electromagnetic acoustic resonance (EMAR) is a contactless resonance method using an electromagnetic acoustic transducer (EMAT). In this study, EMAR was applied to detect the creep damage process in a martensite stainless steel (JIS‐SUS403). We used a bulk‐wave EMAT and measured ultrasonic attenuation and velocity as creep progressed. Attenuation coefficient exhibits a much larger sensitivity to the damage accumulation than the velocity. It shows a maximum peak at approximately 20% and a minimum peak at 50% of the creep life.

Topics
Electromagnetic acoustic transducer, Ultrasonic phenomena, Acoustic phenomena, Alloys, Radiometry
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© 2008 American Institute of Physics.
2008
American Institute of Physics
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