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  4. Nondestructive characterization of laser powder bed fusion parts with neutron Bragg edge imaging
 
research article

Nondestructive characterization of laser powder bed fusion parts with neutron Bragg edge imaging

Busi, Matteo
•
Kalentics, Nikola  
•
Morgano, Manuel
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March 1, 2021
Additive Manufacturing

Laser powder bed fusion is an efficient technique for additive manufacturing of metallic materials. The quality of the material produced depends on the optimization of a large range of build parameters and the complex thermo-mechanical build process is prone to inducing detrimental material features such as porosity and residual stresses negatively affecting fatigue resistance and lifetime. Here we apply neutron Bragg edge radiography in a parametric study on printing 316L steel. The parameters concerned are the laser scanning speed and strategy as well as the optional use of support structures. Analyses of the full field single shot wavelength-resolved Bragg edge radiography data enables to characterize local density inhomogeneities, as well as cracks, based on the long wavelength tail of the spectrum and variations of the stress field but also textural features based on the Bragg edge pattern. It is found that in the performed study not only respective differences in the residual stresses due to parameter variation are manifesting but also systematic irregularities due to machine imperfections (e.g. issues with the powder coater) are observed in the printed samples. The study supports the use of the parallel scanning strategy without supports and with the lower utilized scanning speed.

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Type
research article
DOI
10.1016/j.addma.2021.101848
Web of Science ID

WOS:000626284100019

Author(s)
Busi, Matteo
Kalentics, Nikola  
Morgano, Manuel
Griffiths, Seth
Tremsin, Anton S.
Shinohara, Takenao
Loge, Roland  
Leinenbach, Christian
Strobl, Markus
Date Issued

2021-03-01

Publisher

ELSEVIER

Published in
Additive Manufacturing
Volume

39

Article Number

101848

Subjects

Engineering, Manufacturing

•

Materials Science, Multidisciplinary

•

Engineering

•

Materials Science

•

additive manufacturing

•

laser powder bed fusion

•

selective laser melting

•

neutron bragg edge imaging

•

strain mapping

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

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Available on Infoscience
June 19, 2021
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/179249
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