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Assessment of Plastic Deformation Induced by Indentation on a Large Grain on Inconel 600 Using Synchrotron Polychromatic X-ray Microdiffraction

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Abstract

A synchrotron-based three-dimensional (3-D) Laue technique called Differential Aperture X-ray microscopy (DAXM) was used to investigate plastic deformation of Inconel 600 induced by indentation. The DAXM technique is capable of probing up to 60 to 100 μm into the Ni alloy, with micron resolution. A conical indenter was used to generate an indent on a large surface grain on Inconel 600. The DAXM Laue images from the uppermost grain exhibited pronounced streaking and splitting of Laue spots, which increased as the grain boundary was approached. Splitting of the Laue patterns correlates with subgrain or dislocation cell formation. A significant amount of dislocation cell formation was found within the 1-μm voxels probed by DAXM. A change in total angle of 8.79 deg was determined for the uppermost grain from the diffraction data from depths 4 to 28 μm, with an average misorientation angle of 2.15 deg between the dislocation cells. The next grain having a different crystallographic orientation continued to rotate in the same direction as the uppermost grain due to the large plastic deformation.

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Acknowledgments

Use of the Advanced Photon Source (APS) was supported by the United States Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. W-31-109-ENG-38. One of the authors (RB) is supported by the United States Department of Energy, Office of Basic Energy Sciences, Materials Sciences and Engineering Division. The authors gratefully acknowledge the funding contributions from Babcock & Wilcox Canada (BWC) and the Centre for Materials and Manufacturing Ontario. The authors also thank Mr. H. Wang, Professor Robert Klassen, and Mr. Ariful Islam, Department of Materials Engineering, University of Western Ontario, for the metallographic preparation, and Mr. Edward Lehockey, Ontario Power Generation, for many useful discussions.

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Correspondence to Marina Suominen Fuller.

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Manuscript submitted December 19, 2011.

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Fuller, M.S., Barabash, R., McIntyre, S. et al. Assessment of Plastic Deformation Induced by Indentation on a Large Grain on Inconel 600 Using Synchrotron Polychromatic X-ray Microdiffraction. Metall Mater Trans A 44, 17–21 (2013). https://doi.org/10.1007/s11661-012-1219-0

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  • DOI: https://doi.org/10.1007/s11661-012-1219-0

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