Validation of models for Laser Ultrasonic spectra as a function of the grain size in steel
Paper i proceeding, 2018
Mathematical modelling of the ultrasonic wave propagation problem has been used in order to get a deeper understanding of the physics and to identify ultrasonic properties that can be used as an indirect measurement of grain size. The use of both analytical and numerical models enabled extensive parametric studies together with investigation of ultrasonic interactions with well-defined individual microstructures.
The LUS technique has previously been applied to e.g. monitor grain growth during thermomechanical processing of metals. These applications identified and used a correlation with the frequency content of the attenuation. This have been investigated as a possible indirect measurement of grain size, also in this project. The models have been used to verify the correlations and to evaluate different procedures that could be applied as an industrial solution. The suggested procedure is based on deconvolving two successive echoes and has been experimentally validated by two different LUS systems. The reference samples used in the validation were produced by changing the annealing temperature and time to obtain a variation in grain sizes. These grain sizes were then identified by EBSD and the samples were examined in terms of grain size influence on spectral attenuation
Författare
Martin Stolzenberg
Salzgitter Mannesmann Forschung
Piet Kok
Tata Steel, Nederländerna
David Krix
Salzgitter Mannesmann Forschung
Håkan Wirdelius
Chalmers, Industri- och materialvetenskap, Konstruktionsmaterial
Mikael Malmström
Swerea
Isabel GUTIERREZ
Centro de Estudios e Investigaciones Tecnicas
A. Duijster
A. Volker
A. Martinez-De-Guerenu
D. Jorge-Badiola
F. D. Van Den Berg
12th ECNDT
Göteborg, Sweden,
Product Uniformity Control (PUC)
Europeiska kommissionen (EU), 2013-07-01 -- 2017-12-31.
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