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  4. Neutron Bragg edge imaging for strain characterization in powder bed additive manufacturing environments
 
research article

Neutron Bragg edge imaging for strain characterization in powder bed additive manufacturing environments

Sumarli, Shieren  
•
Polatidis, Efthymios
•
Malamud, Florencia
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November 1, 2022
Journal Of Materials Research And Technology-Jmr&T

Spatially resolved studies of crystalline structures, e.g. lattice spacings, are enabled by recording the transmitted spectra in neutron Bragg edge imaging. The recorded signals are, however, a result of through-thickness averaging of the probed specimen in the beam direction. Therefore, it is challenging to extract the strain distribution when the strain varies across the thickness, which applies for studies on different materials or material states along the beam. Here we introduce the approach to disentangle contributions to the recorded signals, i.e. separating the transmission spectra of two different material states. This is particularly applicable to powder bed additive manufacturing environments where operando strain characterization of the printed specimen using neutrons is intended. In this work, Laser Powder Bed Fusion (PBF-LB/M)-built 316L and IN718 samples embedded in their corresponding powders are used, extracting the desired spectra of the printed spec-imen. The disentanglement is proven to be satisfactory by obtaining coinciding strain maps of identical specimens embedded in powder layers of different thicknesses. Furthermore, the obtained residual strain distributions of 316L samples were verified by conventional neutron diffraction with lower spatial resolution due to the gauge volume averaging.(c) 2022 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).

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Type
research article
DOI
10.1016/j.jmrt.2022.11.047
Web of Science ID

WOS:000948507700005

Author(s)
Sumarli, Shieren  
Polatidis, Efthymios
Malamud, Florencia
Busi, Matteo
Navarre, Claire  
Esmaeilzadeh, Reza  
Loge, Roland  
Strobl, Markus
Date Issued

2022-11-01

Publisher

ELSEVIER

Published in
Journal Of Materials Research And Technology-Jmr&T
Volume

21

Start page

4428

End page

4438

Subjects

Materials Science, Multidisciplinary

•

Metallurgy & Metallurgical Engineering

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Materials Science

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Metallurgy & Metallurgical Engineering

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laser powder bed fusion

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neutron bragg edge imaging

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neutron transmission analysis

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neutron diffraction

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non-destructive strain

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measurement

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strain mapping

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in-situ

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residual-stresses

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transmission

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diffraction

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
LMTM  
Available on Infoscience
April 10, 2023
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/196828
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