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J. Imaging 2017, 3(4), 58; https://doi.org/10.3390/jimaging3040058

Neutron Imaging of Laser Melted SS316 Test Objects with Spatially Resolved Small Angle Neutron Scattering

1
Department of Chemistry, Louisiana State University, Baton Rouge, LA 70803, USA
2
Department of Mechanical Engineering, Louisiana State University, Baton Rouge, LA 70803, USA
3
Baton Rouge Magnet High School, Baton Rouge, LA 70806, USA
4
National Institute of Standards and Technology, 100 Bureau Dr., Mail Stop 8461, Gaithersburg, MD 20899-8461, USA
*
Author to whom correspondence should be addressed.
Received: 31 October 2017 / Revised: 30 November 2017 / Accepted: 1 December 2017 / Published: 5 December 2017
(This article belongs to the Special Issue Neutron Imaging)
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Abstract

A novel neutron far field interferometer is explored for sub-micron porosity detection in laser sintered stainless steel alloy 316 (SS316) test objects. The results shown are images and volumes of the first quantitative neutron dark-field tomography at various autocorrelation lengths, ξ . In this preliminary work, the beam defining slits were adjusted to an uncalibrated opening of 0.5 mm horizontal and 5 cm vertical; the images are blurred along the vertical direction. In spite of the blurred attenuation images, the dark-field images reveal structural information at the micron-scale. The topics explored include: the accessible size range of defects, potentially 338 nm to 4.5 μ m, that can be imaged with the small angle scattering images; the spatial resolution of the attenuation image; the maximum sample dimensions compatible with interferometry optics and neutron attenuation; the procedure for reduction of the raw interferogram images into attenuation, differential phase contrast, and small angle scattering (dark-field) images; and the role of neutron far field interferometry in additive manufacturing to assess sub-micron porosity. View Full-Text
Keywords: tomography; laser sintered powder bed; neutron far-field interferometry; additive manufacturing tomography; laser sintered powder bed; neutron far-field interferometry; additive manufacturing
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Brooks, A.J.; Knapp, G.L.; Yuan, J.; Lowery, C.G.; Pan, M.; Cadigan, B.E.; Guo, S.; Hussey, D.S.; Butler, L.G. Neutron Imaging of Laser Melted SS316 Test Objects with Spatially Resolved Small Angle Neutron Scattering. J. Imaging 2017, 3, 58.

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