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Neutron interferometry detection of early crack formation caused by bending fatigue in additively manufactured SS316 dogbones
- Source :
- Materials & Design, Vol 140, Iss, Pp 420-430 (2018)
- Publication Year :
- 2018
- Publisher :
- Elsevier BV, 2018.
-
Abstract
- Fatigue in selective laser melted (SLM) and conventionally manufactured stainless steel (SS) 316 dogbones was studied with neutron imaging methods for attenuation, diffraction, and scattering. Neutron attenuation tomography and Bragg edge imaging did not reveal crack formation. Conversely, to efficiently detect the microcrack evolution, two methods of grating-based neutron interferometry, Talbot-Lau and far-field, were employed. Both interferometry methods detect early crack formation via the dark-field (scattering) images, especially for porous microstructures in the range of 0.6 μm to 2 μm. The dark-field image combines sensitivity to micrometer-sized scattering centers at crack formation with sub-millimeter imaging resolution. The crack formation observed with neutron interferometry dark-field was validated post-imaging with additional fatigue cycles to fracture. Further inspection was performed by scanning electron microscopy (SEM) and optical photography. In the two fatigued dogbones, SLM and conventional crack formation was identified to within 1 mm. Keywords: Additive manufacturing, Neutron interferometry, Bragg edge spectroscopy, Fatigue
- Subjects :
- 010302 applied physics
Diffraction
Materials science
Scattering
Scanning electron microscope
Mechanical Engineering
Attenuation
Neutron imaging
02 engineering and technology
Grating
021001 nanoscience & nanotechnology
01 natural sciences
Interferometry
Mechanics of Materials
0103 physical sciences
lcsh:TA401-492
lcsh:Materials of engineering and construction. Mechanics of materials
General Materials Science
Neutron
Composite material
0210 nano-technology
Subjects
Details
- ISSN :
- 02641275
- Volume :
- 140
- Database :
- OpenAIRE
- Journal :
- Materials & Design
- Accession number :
- edsair.doi.dedup.....01fdc3c3dda745734e266457c62ba60d
- Full Text :
- https://doi.org/10.1016/j.matdes.2017.12.001