<i>In-situ</i> Measurement of Solute Partition Coefficient in Fe-Cr-Ni-Mo Alloys by Using X-ray Imaging and X-ray Florescence Analysis

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  • Uwabe Iori
    Department of Materials Science and Engineering, Kyoto University
  • Dobara Kento
    Department of Materials Science and Engineering, Kyoto University
  • Morishita Kohei
    Department of Materials Science and Engineering, Kyoto University
  • Nagira Tomoya
    Joining and Welding Research Institute, Osaka University
  • Yasuda Hideyuki
    Department of Materials Science and Engineering, Kyoto University

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Other Title
  • X線イメージングと蛍光X線分析を利用したFe-Cr-Ni-Mo合金の溶質分配係数のその場測定
  • Xセン イメージング ト ケイコウ Xセン ブンセキ オ リヨウ シタ Fe-Cr-Ni-Mo ゴウキン ノ ヨウシツ ブンパイ ケイスウ ノ ソノ バ ソクテイ
  • In-situ measurement of solute partition coefficient in Fe-Cr-Ni-Mo alloys by using x-ray imaging and x-ray florescence analysis

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Abstract

<p>This study demonstrates in-situ measurement of solute partition coefficient in multicomponent alloys, using X-ray transmission imaging and X-ray florescence spectroscopy. The developed technique was applied to determine partition coefficients of Cr, Ni and Mo between δ phase and liquid phase in Fe-17.4Cr-12.6Ni-2.0Mo-1.6Mn-0.6Si alloys (mass%). In the observation and measurement, X-ray fluorescence spectra were directly obtained by irradiating the incident X-ray beam (23keV) to the solid phase or the liquid phase near solid/liquid interface. The partition coefficients were simply determined from the X-ray florescence analysis. In addition, successive measurements during unidirectional solidification allowed to measure change in partition coefficient along solidification path. During the solidification, partition coefficients of Cr, Ni and Mo changed from 1.01 to 1.08, from 0.76 to 0.70 and from 0.86 to 0.74, respectively. The present study proved that the developed technique was applicable to determine partition coefficients of 3d and 4d transition elements of which characteristic X-ray energies ranged from 4 to 20keV.</p>

Journal

  • Tetsu-to-Hagane

    Tetsu-to-Hagane 103 (12), 678-687, 2017

    The Iron and Steel Institute of Japan

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