Validation of models for Laser Ultrasonic spectra as a function of the grain size in steel
Paper i proceeding, 2018

To reduce costs of production and increase economic sustainability it is necessary to introduce quality assessment in an early stage in the manufacturing process. In an ongoing European project (Product Uniformity Control – PUC), the intention is to use ultrasonic information to assess microstructure parameters that are related to macroscale qualities such as mechanical properties. Laser induced ultrasonic technique (LUS) requires no media and can generate and detect ultrasonic information at some distance from the component. This technique is therefore addressed within this project as a solution to measure ultrasonic properties in an industrial environment.

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

Mikael Malmström

Swerea KIMAB

Isabel GUTIERREZ

Centro de Estudios e Investigaciones Tecnicas

Håkan Wirdelius

Chalmers, Industri- och materialvetenskap, Konstruktionsmaterial

David Krix

Salzgitter Mannesmann Forschung

A. Duijster

A. Volker

A. Martinez-De-Guerenu

D. Jorge-Badiola

F. D. Van Den Berg

12th ECNDT

12th European Conference on Non-destructive Testing
Göteborg, Sweden,

Product Uniformity Control (PUC)

Europeiska kommissionen (EU), 2013-07-01 -- 2017-12-31.

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Produktionsteknik, arbetsvetenskap och ergonomi

Övrig annan teknik

Annan materialteknik

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Produktion

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2018-10-04