Characterization of Microstructure Variations by Laser-Ultrasound during and after the Heat Treatment of Metals

We demonstrate the potential of laser ultrasound for non-destructive testing applications in steel production and processing in two use cases: (1) Imaging of the grain structure transition between the thermally hardened surface and the unaffected core material with a comparison to sectional views by...

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Bibliographic Details
Published in:IOP conference series. Materials Science and Engineering 2021-08, Vol.1178 (1), p.12050
Main Authors: Scherleitner, E, Kerschbaummayr, C, Haderer, W, Reitinger, B, Mitter, T, Gruensteidl, C
Format: Article
Language:English
Subjects:
Core hardenability
Grain structure
Heat treatment
Lamb waves
Lasers
Metal sheets
Metallurgy
Nondestructive testing
Optical microscopes
Poisson's ratio
Resonant frequencies
Steel production
Ultrasonic imaging
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Summary:We demonstrate the potential of laser ultrasound for non-destructive testing applications in steel production and processing in two use cases: (1) Imaging of the grain structure transition between the thermally hardened surface and the unaffected core material with a comparison to sectional views by an optical microscope. We found very good correlation between the laser ultrasonic image and the microscopic view at the cross section. (2) In situ monitoring of Poisson’s ratio of steel sheets during thermal processes by evaluation of resonant frequencies of Lamb waves. In our ongoing research the results will be correlated to metallurgical properties of interest.
ISSN:1757-8981
1757-899X
DOI:10.1088/1757-899X/1178/1/012050