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

Abstract

In this study, 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. Lastly, the dark-field volume shows features with dimensions near and smaller than the interferometer auto-correlation scattering length.

Authors:
 [1];  [2]; ORCiD logo [3]; ORCiD logo [3]; ORCiD logo [4];  [5];  [5];  [1]
  1. Louisiana State Univ., Baton Rouge, LA (United States). Department of Chemistry
  2. Louisiana State Univ., Baton Rouge, LA (United States). Center for Computation and Technology
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Manufacturing Demonstration Facility
  4. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Chemical and Engineering Materials Division
  5. Helmholtz Center Berlin for Materials and Energy, Berlin (Germany)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); USDOE Office of Energy Efficiency and Renewable Energy (EERE), Advanced Manufacturing Office (EE-5A)
OSTI Identifier:
1394315
DOE Contract Number:  
AC05-00OR22725
Resource Type:
Journal Article
Journal Name:
Progress in Additive Manufacturing
Additional Journal Information:
Journal Volume: 2; Journal Issue: 3; Journal ID: ISSN 2363-9512
Publisher:
Springer
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 42 ENGINEERING; Neutron interferometry; Electron beam melting; Additive manufacturing; Porosity; Tomography

Citation Formats

Brooks, Adam J., Ge, Jinghua, Kirka, Michael M., Dehoff, Ryan R., Bilheux, Hassina Z., Kardjilov, Nikolay, Manke, Ingo, and Butler, Leslie G. Porosity detection in electron beam-melted Ti-6Al-4V using high-resolution neutron imaging and grating-based interferometry. United States: N. p., 2017. Web. doi:10.1007/s40964-017-0025-z.
Brooks, Adam J., Ge, Jinghua, Kirka, Michael M., Dehoff, Ryan R., Bilheux, Hassina Z., Kardjilov, Nikolay, Manke, Ingo, & Butler, Leslie G. Porosity detection in electron beam-melted Ti-6Al-4V using high-resolution neutron imaging and grating-based interferometry. United States. doi:10.1007/s40964-017-0025-z.
Brooks, Adam J., Ge, Jinghua, Kirka, Michael M., Dehoff, Ryan R., Bilheux, Hassina Z., Kardjilov, Nikolay, Manke, Ingo, and Butler, Leslie G. Wed . "Porosity detection in electron beam-melted Ti-6Al-4V using high-resolution neutron imaging and grating-based interferometry". United States. doi:10.1007/s40964-017-0025-z.
@article{osti_1394315,
title = {Porosity detection in electron beam-melted Ti-6Al-4V using high-resolution neutron imaging and grating-based interferometry},
author = {Brooks, Adam J. and Ge, Jinghua and Kirka, Michael M. and Dehoff, Ryan R. and Bilheux, Hassina Z. and Kardjilov, Nikolay and Manke, Ingo and Butler, Leslie G.},
abstractNote = {In this study, 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. Lastly, the dark-field volume shows features with dimensions near and smaller than the interferometer auto-correlation scattering length.},
doi = {10.1007/s40964-017-0025-z},
journal = {Progress in Additive Manufacturing},
issn = {2363-9512},
number = 3,
volume = 2,
place = {United States},
year = {2017},
month = {5}
}

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