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Title: Investigation of microstructure in additive manufactured Inconel 625 by spatially resolved neutron transmission spectroscopy

Journal Article · · Science and Technology of Advanced Materials
 [1];  [2];  [2];  [3];  [4]
  1. Space Sciences Laboratory, University of California at Berkeley, Berkeley, CA, USA
  2. General Electric Global Research Center, Niskayuna, NY, USA
  3. Consiglio Nazionale delle Ricerche, Istituto Sistemi Complessi (CNR-ISC), Sesto Fiorentino (FI), Italy
  4. Japan Atomic Energy Agency Tokai-mura, Naka-gun Ibaraki, Japan
+ Show Author Affiliations

Non-destructive testing techniques based on neutron imaging and diffraction can provide information on the internal structure of relatively thick metal samples (up to several cm), which are opaque to other conventional non-destructive methods. Spatially resolved neutron transmission spectroscopy is an extension of traditional neutron radiography, where multiple images are acquired simultaneously, each corresponding to a narrow range of energy. The analysis of transmission spectra enables studies of bulk microstructures at the spatial resolution comparable to the detector pixel. In this study we demonstrate the possibility of imaging (with ~100 μm resolution) distribution of some microstructure properties, such as residual strain, texture, voids and impurities in Inconel 625 samples manufactured with an additive manufacturing method called direct metal laser melting (DMLM). Although this imaging technique can be implemented only in a few large-scale facilities, it can be a valuable tool for optimization of additive manufacturing techniques and materials and for correlating bulk microstructure properties to manufacturing process parameters. Additionally, the experimental strain distribution can help validate finite element models which many industries use to predict the residual stress distributions in additive manufactured components.

Research Organization:
NOVA Scientific, Inc., Sturbridge, MA (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
FG02-07ER86322; FG02-08ER86353 and DE-SC0009; SC0009657
OSTI ID:
1510149
Alternate ID(s):
OSTI ID: 1313815
Journal Information:
Science and Technology of Advanced Materials, Journal Name: Science and Technology of Advanced Materials Vol. 17 Journal Issue: 1; ISSN 1468-6996
Publisher:
Informa UK LimitedCopyright Statement
Country of Publication:
United Kingdom
Language:
English
Citation Metrics:
Cited by: 17 works
Citation information provided by
Web of Science

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Cited By (4)

Applying neutron transmission physics and 3D statistical full-field model to understand 2D Bragg-edge imaging journal February 2018
Bragg-edge elastic strain tomography for in situ systems from energy-resolved neutron transmission imaging journal October 2017
Characterization of Crystallographic Structures Using Bragg-Edge Neutron Imaging at the Spallation Neutron Source journal December 2017
Materials and Life Science Experimental Facility (MLF) at the Japan Proton Accelerator Research Complex II: Neutron Scattering Instruments journal November 2017

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Related Subjects

36 MATERIALS SCIENCE
non-destructive testing
additive manufacturing
microstructure
neutron imaging