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How does grazing incidence ultrasonic microscopy work? A study based on grain-scale numerical simulations

How does grazing incidence ultrasonic microscopy work? A study based on grain-scale numerical simulations
How does grazing incidence ultrasonic microscopy work? A study based on grain-scale numerical simulations
Grazing incidence ultrasonic microscopy (GIUM) is an experimental method for visualising the microstructures of polycrystals with local preferential orientations. It has previously been demonstrated on an austenitic stainless steel weld, exposing grains much smaller than the propagating wavelength, but the physical mechanism of the method has only been proposed as a hypothesis. In this paper, we use grain-scale finite element simulations based on the EBSD measurements to verify the principles behind GIUM images further and to assess how deep does the method penetrate the component under examination. The simulations indicate that while lateral contraction of grains contains microstructure signatures, the free surface effect is the crucial factor contributing to the generation of the images. Further, we show that only features up to the depth in the order of the average grain size in that direction can be visualised.
0041-624X
Kalkowski, Michał K
6f0d01ef-7f44-459c-82a2-03f9e1275eda
Lowe, Michael JS
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Barth, Martin
294bd80d-af4c-4839-b5c6-1a626446dd46
Rjelka, Marek
610e605b-c8ff-4737-8a1f-03e2b2655d25
Köhler, Bernd
238bfe5d-f83c-4716-9103-988b1f90da63
Kalkowski, Michał K
6f0d01ef-7f44-459c-82a2-03f9e1275eda
Lowe, Michael JS
3fe38792-9acf-4f3e-8067-78c8f50d933a
Barth, Martin
294bd80d-af4c-4839-b5c6-1a626446dd46
Rjelka, Marek
610e605b-c8ff-4737-8a1f-03e2b2655d25
Köhler, Bernd
238bfe5d-f83c-4716-9103-988b1f90da63

Kalkowski, Michał K, Lowe, Michael JS, Barth, Martin, Rjelka, Marek and Köhler, Bernd (2021) How does grazing incidence ultrasonic microscopy work? A study based on grain-scale numerical simulations. Ultrasonics, 114, [106387]. (doi:10.1016/j.ultras.2021.106387).

Record type: Article

Abstract

Grazing incidence ultrasonic microscopy (GIUM) is an experimental method for visualising the microstructures of polycrystals with local preferential orientations. It has previously been demonstrated on an austenitic stainless steel weld, exposing grains much smaller than the propagating wavelength, but the physical mechanism of the method has only been proposed as a hypothesis. In this paper, we use grain-scale finite element simulations based on the EBSD measurements to verify the principles behind GIUM images further and to assess how deep does the method penetrate the component under examination. The simulations indicate that while lateral contraction of grains contains microstructure signatures, the free surface effect is the crucial factor contributing to the generation of the images. Further, we show that only features up to the depth in the order of the average grain size in that direction can be visualised.

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Accepted/In Press date: 28 January 2021
Published date: 18 February 2021

Identifiers

Local EPrints ID: 454393
URI: http://eprints.soton.ac.uk/id/eprint/454393
ISSN: 0041-624X
PURE UUID: c0d07eef-7a38-49de-9378-6c8737ebee6c

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Date deposited: 09 Feb 2022 17:30
Last modified: 16 Mar 2024 15:31

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Contributors

Author: Michael JS Lowe
Author: Martin Barth
Author: Marek Rjelka
Author: Bernd Köhler

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