Elasticity and wave velocity in fcc iron (austenite) at elevated temperatures - Experimental verification of ab-initio calculations

Bevis Hutchinson; Mikael Malmström; Johan Lönnqvist; Pete Bate; Hossein Ehteshami; Pavel A Korzhavyi

doi:10.1016/j.ultras.2018.02.009

Elasticity and wave velocity in fcc iron (austenite) at elevated temperatures - Experimental verification of ab-initio calculations

Ultrasonics. 2018 Jul:87:44-47. doi: 10.1016/j.ultras.2018.02.009. Epub 2018 Feb 8.

Authors

Bevis Hutchinson¹, Mikael Malmström², Johan Lönnqvist², Pete Bate², Hossein Ehteshami³, Pavel A Korzhavyi³

Affiliations

¹ SwereaKIMAB, Kista, Sweden. Electronic address: bevis.hutchinson@swerea.se.
² SwereaKIMAB, Kista, Sweden.
³ KTH, Royal Institute of Technology, Stockholm, Sweden.

PMID: 29448051
DOI: 10.1016/j.ultras.2018.02.009

Abstract

High temperature crystal elasticity constants for face centred cubic austenite are important for interpreting the ultrasonic properties of iron and steels but cannot be determined by normal single crystal methods. Values of these constants have recently been calculated using an ab-initio approach and the present work was carried out to test their applicability using laser-ultrasonic measurements. Steel samples having a known texture were examined at temperatures between 800 °C and 1100 °C to measure the velocity of longitudinal P-waves which were found to be in good agreement with modelled values.