Anomalous ultrasonic attenuation in ferritic steels at elevated temperatures
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Updated: Mar 23, 2026

Ultrasonic Fatigue Testing in the Tension-Compression Mode
Published on: March 7, 2018
Bevis Hutchinson1, Peter Lundin1, Eva Lindh-Ulmgren1
1Swerea KIMAB, Box 7047, SE-164 07 Kista, Sweden.
Abstract:
An unexpected peak in attenuation has been observed at ∼800°C when heating low carbon steels in a laser-ultrasonic instrument. An explanation is given in terms of enhanced crystalline anisotropy with increasing temperature in the bcc ferrite range combined with subsequent transformation to austenite at still higher temperatures. An analysis based on theoretical models of attenuation in the Rayleigh regime is in good agreement with the experimental observations.
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