Porosity detection in electron beam-melted Ti-6Al-4V using high-resolution neutron imaging and grating-based interferometry

Adam J. Brooks; Jinghua Ge; Michael M. Kirka; Ryan R. Dehoff; Hassina Z. Bilheux; Nikolay Kardjilov; Ingo Manke; Leslie G. Butler

doi:10.1007/s40964-017-0025-z

Porosity detection in electron beam-melted Ti-6Al-4V using high-resolution neutron imaging and grating-based interferometry

Adam J. Brooks, Jinghua Ge, Michael M. Kirka, Ryan R. Dehoff, Hassina Z. Bilheux, Nikolay Kardjilov, Ingo Manke, Leslie G. Butler

Research output: Contribution to journal › Article › peer-review

43 Scopus citations

Abstract

A high-resolution neutron tomography system and a grating-based interferometer are used to explore electron beam-melted titanium test objects. The high-resolution neutron tomography system (attenuation-based imaging) has a pixel size of 6.4 µm, appropriate for detecting voids near 25 µm over a (1.5 cm)³ volume. The neutron interferometer provides dark-field (small-angle scattering) images with a pixel size of 30 µm. Moreover, the interferometer can be tuned to a scattering length, in this case, 1.97 µm, with a field-of-view of (6 cm)³. The combination of high-resolution imaging with grating-based interferometry provides a way for nondestructive testing of defective titanium samples. A chimney-like pore structure was discovered in the attenuation and dark-field images along one face of an electron beam-melted (EBM) Ti-6Al-4V cube. Tomographic reconstructions of the titanium samples are utilized as a source for a binary volume and for skeletonization of the pores. The dark-field volume shows features with dimensions near and smaller than the interferometer auto-correlation scattering length.

Original language	English
Pages (from-to)	125-132
Number of pages	8
Journal	Progress in Additive Manufacturing
Volume	2
Issue number	3
DOIs	https://doi.org/10.1007/s40964-017-0025-z
State	Published - Sep 1 2017

Funding

AJB and LGB gratefully acknowledge support from the Louisiana Consortium for Neutron Scattering (LaCNS), funded by the US Department of Energy- EPSCoR Cooperative Agreement No. EPS-1003897 and the Louisiana Board of Regents. MMK and RRD are supported by the Additive Manufacturing Demonstration Facility of Oak Ridge National Laboratory and by the US Department of Energy, Office of Energy Efficiency and Renewable Energy, Advanced Manufacturing Office, under contract DE-AC05-00OR22725 with UT-Battelle, LLC. HZB is supported by the DOE Office of Science under contract DE-AC05-00OR22725 with UT-Battelle, LLC. AJB and LGB gratefully acknowledge support from the Louisiana Consortium for Neutron Scattering (LaCNS), funded by the US Department of Energy- EPSCoR Cooperative Agreement No. EPS-1003897 and the Louisiana Board of Regents. MMK and RRD are supported by the Additive Manufacturing Demonstration Facility of Oak Ridge National Laboratory and by the US Department of Energy, Office of Energy Efficiency and Renewable Energy, Advanced Manufacturing Office, under contract DE-AC05-00OR22725 with UT-Battelle, LLC. HZB is supported by the DOE Office of Science under contract DE-AC05-00OR22725 with UT-Battelle, LLC.

Funders	Funder number
DOE Office of Science
US Department of Energy
U.S. Department of Energy
Office of Experimental Program to Stimulate Competitive Research	EPS-1003897
Advanced Manufacturing Office	DE-AC05-00OR22725
Office of Science
Office of Energy Efficiency and Renewable Energy
Oak Ridge National Laboratory
Louisiana Board of Regents

Keywords

Additive manufacturing
Electron beam melting
Neutron interferometry
Porosity
Tomography

UN SDGs

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10.1007/s40964-017-0025-z

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title = "Porosity detection in electron beam-melted Ti-6Al-4V using high-resolution neutron imaging and grating-based interferometry",

abstract = "A high-resolution neutron tomography system and a grating-based interferometer are used to explore electron beam-melted titanium test objects. The high-resolution neutron tomography system (attenuation-based imaging) has a pixel size of 6.4 µm, appropriate for detecting voids near 25 µm over a (1.5 cm)3 volume. The neutron interferometer provides dark-field (small-angle scattering) images with a pixel size of 30 µm. Moreover, the interferometer can be tuned to a scattering length, in this case, 1.97 µm, with a field-of-view of (6 cm)3. The combination of high-resolution imaging with grating-based interferometry provides a way for nondestructive testing of defective titanium samples. A chimney-like pore structure was discovered in the attenuation and dark-field images along one face of an electron beam-melted (EBM) Ti-6Al-4V cube. Tomographic reconstructions of the titanium samples are utilized as a source for a binary volume and for skeletonization of the pores. The dark-field volume shows features with dimensions near and smaller than the interferometer auto-correlation scattering length.",

keywords = "Additive manufacturing, Electron beam melting, Neutron interferometry, Porosity, Tomography",

author = "Brooks, {Adam J.} and Jinghua Ge and Kirka, {Michael M.} and Dehoff, {Ryan R.} and Bilheux, {Hassina Z.} and Nikolay Kardjilov and Ingo Manke and Butler, {Leslie G.}",

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AU - Dehoff, Ryan R.

AU - Bilheux, Hassina Z.

AU - Kardjilov, Nikolay

AU - Manke, Ingo

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AB - A high-resolution neutron tomography system and a grating-based interferometer are used to explore electron beam-melted titanium test objects. The high-resolution neutron tomography system (attenuation-based imaging) has a pixel size of 6.4 µm, appropriate for detecting voids near 25 µm over a (1.5 cm)3 volume. The neutron interferometer provides dark-field (small-angle scattering) images with a pixel size of 30 µm. Moreover, the interferometer can be tuned to a scattering length, in this case, 1.97 µm, with a field-of-view of (6 cm)3. The combination of high-resolution imaging with grating-based interferometry provides a way for nondestructive testing of defective titanium samples. A chimney-like pore structure was discovered in the attenuation and dark-field images along one face of an electron beam-melted (EBM) Ti-6Al-4V cube. Tomographic reconstructions of the titanium samples are utilized as a source for a binary volume and for skeletonization of the pores. The dark-field volume shows features with dimensions near and smaller than the interferometer auto-correlation scattering length.

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Porosity detection in electron beam-melted Ti-6Al-4V using high-resolution neutron imaging and grating-based interferometry

Abstract

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UN SDGs

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