Abstract
The accuracy of the phase fraction determined by time-of-flight neutron diffraction measurement at iMATERIA was verified by preparing model samples consisting of laminations of ferritic and austenitic stainless-steel sheets. Rietveld texture analysis, based on 132 diffractograms, was employed as the analysis method. The analyzed volume fractions of austenite agree with the prepared fractions (0.61–49.3 vol%) with a maximum error of only 5%, relative to the prepared fractions. This is due to the excellent fitting quality of the multi-diffractogram-based Rietveld refinement with consideration given to the textures of both the major and minor phases. Although the quality of the texture analysis for the austenite phase becomes poor, at <5 vol%, the consideration of the textures improves the accuracy of the phase fraction determination. Also described is how the textures affect the phase fractions, as determined by the conventional diffraction method. It is clearly shown that texture cannot be ignored in phase fraction analysis and, in turn, a reasonable consideration of the texture realizes precision in the analysis.
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Acknowledgements
The neutron diffraction experiments were conducted at the Materials and Life Science Experimental Facility of J-PARC as part of proposal 2016PM0001. The authors acknowledge the assistance of Nippon Steel Sumitomo Metal Co., Ltd., for providing the materials for the test samples. We appreciate the kind support provided by Dr. Makoto Hayashi and Dr. Tetsuro Minemura. We are also grateful to Dr. Sven Vogel for advice related to the theory and experiments. Finally, we would like to acknowledge Dr. Luca Lutterotti and his commitment to the ongoing development of the MAUD software.
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Onuki, Y., Hoshikawa, A., Sato, S. et al. Quantitative phase fraction analysis of steel combined with texture analysis using time-of-flight neutron diffraction. J Mater Sci 52, 11643–11658 (2017). https://doi.org/10.1007/s10853-017-1309-x
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DOI: https://doi.org/10.1007/s10853-017-1309-x