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The application of geometry corrections for Diffraction Strain Tomography (DST) analysis of a Ni-base superalloy blade

Published online by Cambridge University Press:  14 November 2013

Nikolaos Baimpas ,
Mengyin Xie ,
Christina Reinhard  and
Alexander M. Korsunsky
Nikolaos Baimpas*
Affiliation:
Department of Engineering Science, University of Oxford, OX1 3PJ
Mengyin Xie
Affiliation:
Department of Engineering Science, University of Oxford, OX1 3PJ
Christina Reinhard
Affiliation:
Beamline scientist in I12 beamline at Diamond Light Source, Harwell Science and Innovation Campus, Didcot, Oxfordshire OX11 0DE, UK
Alexander M. Korsunsky
Affiliation:
Department of Engineering Science, University of Oxford, OX1 3PJ
*
a) Nikolaos Baimpas is doctoral student in the Department of Engineering Science, University of Oxford, OX1 3PJ (corresponding author, phone: +44(0)18652-83447; e-mail: nikolaos.baimpas@eng.ox.ac.uk).
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Abstract

X-ray diffraction is commonly used for non-destructive and precise quantitative determination of internal strain distributions. In recent years tomographic imaging has also been established as a powerful tool for precise non-destructive evaluation of internal structure in materials offering submicron resolution 3D imaging of density distributions. “Diffraction Strain tomography” (DST) concept (Korsunsky, Vorster et al. 2006) has been introduced as a means of tomographic reconstruction of two-dimensional internal strain distributions. The application of this approach during in situ loading has been subsequently demonstrated (Korsunsky et al., 2011). In the present study, similar acquisition strategy was used for diffraction data collection from a Ni-base superalloy turbine blade fabricated by DMLS (Direct Metal Laser Sintering, also sometimes referred to as DLD, Direct Laser Deposition). The experiment was conducted on beamline I12 (JEEP) at Diamond Light Source, UK. Each location within the object was multiply “sampled” (i.e. diffraction patterns were collected containing its contribution) by incident X-ray beams travelling through the sample at different angles. The setup of the beamline also allowed to acquire simultaneously a conventional (absorption tomography) reconstruction of the sample shape. The aim of the experiment was to obtain detailed information about the sample shape, structure, and state. The interpretation of diffraction tomography data requires precise calibration of the sample detector distance at different rotations and positions across the sample, and subsequent application of corrections to remove geometry-induced strain aberrations.

Keywords

Rich TomographySynchrontron Monochromatic X-ray DiffractionStrain Reconstruction
Type
Technical Articles
Information
Powder Diffraction , Volume 28 , Supplement S2 , September 2013 , pp. S436 - S447
Copyright
Copyright © International Centre for Diffraction Data 2013 

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