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Bragg edge imaging
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Journal Articles
AM&P Technical Articles (2016) 174 (8): 16–20.
Published: 01 September 2016
... and are increasingly used in combination. A limitation of the residual stress and Bragg-edge imaging techniques is the ability to time-stamp neutrons at a very high temporal resolution to provide a mechanism to detect Bragg shifts. Analysis of the imaging pattern using single Bragg peak fit or full pattern Rietveld...
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Recent advances in neutron sources and detector technologies enable new contrast mechanisms to determine crystalline information for metal components. This new capability can help validate emerging additive manufacturing processes used to produce parts with complex geometries.
Journal Articles
Hassina Z. Bilheux, R. Aaron Hanks, Jean-Christophe Bilheux, Harley Skorpenske, Mary-Ellen Donnelly ...
AM&P Technical Articles (2023) 181 (8): 18–23.
Published: 01 November 2023
... of access of the facility, and illustrates the nondestructive measurements and interpretation of results. Copyright © ASM International® 2023 2023 ASM International 3D elemental mapping Bragg edge imaging crystallographic analysis hyperspectral neutron radiography resonance imaging VENUS...
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Wavelength-dependent or hyperspectral imaging is a novel nondestructive characterization technique in the field of neutron radiography and computed tomography. A dedicated facility named VENUS is currently being built at Oak Ridge National Laboratory to provide these characterization capabilities for academia, industry, and other national laboratories. This feature article describes the VENUS capabilities for materials science and engineering, provides a quick overview of the modes of access of the facility, and illustrates the nondestructive measurements and interpretation of results.
Journal Articles
AM&P Technical Articles (2013) 171 (3): 23–27.
Published: 01 March 2013
... computed tomography time-of-flight (TOF) properties, which allow probing the Conventional two-dimensional (2-D) neutron radiog- wavelength-discrete neutron attenuation[6]. Energy-selec- raphy and three-dimensional (3-D) computed tomography tive and Bragg edge-imaging capabilities will provide en- are based...
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Neutron-based imaging and measurement techniques are an ideal complement to x-ray methods for characterizing additively manufactured materials and components. This article presents examples showing how neutron radiography and residual strain measurements reveal the internal structure and stress distributions in highly engineered turbine blades produced by additive processes. It also discusses the development of neutron characterization tools at ORNL and a recent effort in which they were used to evaluate stress-relief treatments for large-scale metal AM structures.