Evaluation of Fatigue Damage by Diffraction Contrast Tomography Using Synchrotron Radiation

Abstract:

The three dimensional grain mapping technique for polycrystalline material, which is called X-ray diffraction contrast tomography (DCT) has proposed. In the present study, the measurement of DCT was conducted in SPring-8, which is the brightest synchrotron radiation facility in Japan, and the condition of measurement and data procedure are discussed. Developed technique was applied to aluminium alloy and stainless steel. The shape and location of grain could be determined by the developed three-dimensional mapping technique using the apparatus in a bending beam line of SPring-8. To evaluate plastic deformation, the grain orientation spreads of individual grains were measured. The grain orientation spread is caused by the mosaicity, which relates to the dislocation structure in a grain. The grain orientation spread was found to increase with increasing plastic strain. Fatigue damage also could be evaluated by the grain orientation spread in the DCT measurement.

• Periodical: Materials Science Forum (Volumes 783-786)
• Pages: 2359-2364
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.783-786.2359
• Online since: May 2014
• Authors: Daiki Shiozawa*, Yoshikazu Nakai, Ryotaro Miura, Shota Matsuda
• Keywords: Diffraction Contrast Tomography, Fatigue Damage, Imaging, Plastic Deformation, Synchrotron Radiation

References

[1] H. F. Poulsen, Three-dimensional X-ray diffraction microscopy. mapping polycrystals and their dynamics, Springer Tracts in Modern Physics, Springer, Berlin, (2004).

DOI: 10.1007/978-3-540-44483-1_5

[2] B. C. Larson, W. Yang, G. E. Ice, J. D. Budai, and T. Z. Tischler, Three-dimensional X-ray structural microscopy with submicrometre resolution, Nature, 415, 2002, 887–890.

DOI: 10.1038/415887a

[3] W. Ludwig, S. Schmidt, E. M. Lauridsen and H. F. Poulsen, X-ray diffraction contrast tomography: A novel technique for three-dimenshional grain mapping of polycrystals. I. Direct beam case, Joural of Applied Crystallography, 41, 208, 302-309.

DOI: 10.1107/s0021889808001684

[4] G. Johnson, A. King, M. G. Honnicke, J. Marrow and W. olfgang Ludwig, X-ray diffraction contrast tomography: a novel technique for three-dimensional grain mapping of polycrystals. II. The combined case, Joural of Applied Crystallography, 41, 2008, 310-318.

DOI: 10.1107/s0021889808001726

[5] W. Ludwig, P. Reischig, A. King, M. Herbig, E. M. Lauridsen, G. Johnson, T. J. Marrow, and J. Y. Buffière, Three-dimensional grain mapping by X-ray diffraction contrast tomography and the use of fredel pairs in diffraction data analysis, Review of Scientific Instruments, 80, 2009, 033905.

DOI: 10.1063/1.3100200

[6] D. Shiozawa, Y. Nakai, H. Nosho, Observation of 3D shape and propagation mode transition of fatigue cracks in Ti–6Al–4V under cyclic torsion using CT imaging with ultra-bright synchrotron radiation, To be published in International Journal of Fatigue, doi: 10. 1016/j. ijfatigue. 2013. 02. 018, (2013).

DOI: 10.1016/j.ijfatigue.2013.02.018

[7] Y. Nakai and D. Shiozawa, Initiation and Growth of Pits and Cracks in Corrosion Fatigue for High Strength Aluminium Alloy Observed by Micro Computed-tomography Using Ultra-bright Synchrotron Radiation, Applied Mechanics and Materials, 83, 2011, 162-167.

DOI: 10.4028/www.scientific.net/amm.83.162

[8] R. Gordon, R. Bender, and G. T. Herman, Algebraic Reconstruction Techniques (ART) for three-dimensional electron microscopy and X-ray photography, J. Theor. Biol, 29, 1970, 471-481.

DOI: 10.1016/0022-5193(70)90109-8

[9] S. Taira, X-ray-diffraction Approach for Studies on Fatigue and Creep, Experimental Mechanics, 13, issue 11, 1973, 449-463.

DOI: 10.1007/bf02322729

[10] D. J. Quesnel, M. Meshii and J. B. Cohen, Material Science and Engineering, 36 , issue 2, 1978, 207-215.

[11] Y. Nakai, Evaluation of Fatigue Damage and Fatigue Crack Initiation Process by Means of Atomic-Force Microscopy, Materials Science Research International, 7, No. 2, 2001, 73-81.

DOI: 10.2472/jsms.50.6appendix_73