Hostname: page-component-586b7cd67f-t7czq Total loading time: 0 Render date: 2024-11-26T14:17:20.115Z Has data issue: false hasContentIssue false
  • English
  • Français

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: [email protected]).
Get access Rights & Permissions [Opens in a new window]

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 

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

Han, L., Phatak, K. M. and Liou, F. W. (2005). “Modeling of laser deposition and repair process,” J. Laser Appl. 17(2), 89–99.Google Scholar
Hofmann, F., Abbey, B., Conner, L., Baimpas, N., Song, X., Keegan, S., and Korsunsky, A. M. (2011). “Imaging of grain-level orientation and strain in thicker metallic polycrystals by high energy transmission micro-beam Laue (HETL) diffraction techniques,” Int. J. Mater. Res. 103(2), 192–199.Google Scholar
Korsunsky, A. M., Baimpas, N., Song, X., Belnoue, J., Hofmann, F., Abbey, B., Xie, M., Andrieux, J., Buslaps, T. and Neo, T. K. (2011). “Strain tomography of polycrystalline zirconia dental prostheses by synchrotron X-ray diffraction,” Acta Mater. 59(6), 2501–2513.Google Scholar
Korsunsky, A. M., Vorster, W. J. J., Zhang, S. Y., Dini, D., Latham, D., Golshan, M., Liu, J., Kyriakoglou, Y. and Walsh, M. J. (2006). “The principle of strain reconstruction tomography: Determination of quench strain distribution from diffraction measurements,” Acta Mater. 54(8), 2101–2108.CrossRefGoogle Scholar
Korsunsky, A. M., Xie, X., Baimpas, N. and Song, X. (2012). “X-ray Texture Analysis and Imaging of Engineering Materials at Oxford HEX-lab,” Proceedings of the International MultiConference of Engineers and Computer Scientists 2012. Hong Kong, IMECS 2012. II.Google Scholar
Moat, R. J., Pinkerton, A. J., Li, L., Withers, P. J. and Preuss, M. (2009). “Crystallographic texture and microstructure of pulsed diode laser-deposited Waspaloy,” Acta Mater. 57(4), p.1220–1229.CrossRefGoogle Scholar
Obrist, A. (2001). “First Article Inspection Based on Industrial X-ray Computed Tomography,” Materials Testing and Research International Conference Nuremburg 177-180.Google Scholar
Prime, M. B. (2001). “Cross-Sectional mapping of residual stresses by measuring the surface contour after a cut,” J. Eng. Mater. Technol. 123, 162–168.Google Scholar
Toyserkani, E., Khajepour, A. and Corbin, S. (2000). Laser Cladding (CRC Press, Boca Raton, FL), Chap. 2.Google Scholar