Anomalous ultrasonic attenuation in ferritic steels at elevated temperatures

Bevis Hutchinson; Peter Lundin; Eva Lindh-Ulmgren; Daniel Lévesque

doi:10.1016/j.ultras.2016.03.005

Anomalous ultrasonic attenuation in ferritic steels at elevated temperatures

Ultrasonics. 2016 Jul:69:268-72. doi: 10.1016/j.ultras.2016.03.005. Epub 2016 Mar 11.

Authors

Bevis Hutchinson¹, Peter Lundin², Eva Lindh-Ulmgren³, Daniel Lévesque⁴

Affiliations

¹ Swerea KIMAB, Box 7047, SE-164 07 Kista, Sweden. Electronic address: bevis.hutchinson@swerea.se.
² Swerea KIMAB, Box 7047, SE-164 07 Kista, Sweden. Electronic address: peter.m.lundin@swerea.se.
³ Swerea KIMAB, Box 7047, SE-164 07 Kista, Sweden. Electronic address: eva.lindh@swerea.se.
⁴ National Research Council Canada, 75, de Mortagne, Boucherville, QC J4B 6Y4, Canada. Electronic address: daniel.levesque@cnrc-nrc.gc.ca.

PMID: 27015796
DOI: 10.1016/j.ultras.2016.03.005

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.

Keywords: Anisotropy; Attenuation; Laser-ultrasonics; Phase transformation; Steel.

Publication types

Research Support, Non-U.S. Gov't