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ONLINE ISSN: 1883-2954
PRINT ISSN: 0021-1575

Tetsu-to-Hagané Advance Publication

  • 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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    DOI:10.2355/tetsutohagane.TETSU-2017-077

    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 1.01to 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.
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    Readers Who Read This Article Also Read

    1. Factors to Determine Inclusion Compositions in Molten Steel during the Secondary Refining Process of Case-Hardening Steel ISIJ International Vol.56(2016), No.11
  • Elastoplastic Deformation of a Steel Tube Subjected to the Strain Paths Composed of Two Line Segments

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    DOI:10.2355/tetsutohagane.TETSU-2017-052

    Constitutive equations play an important role for improving the accuracy of finite element analysis used in metal forming simulations. Plastic flow behavior of a steel tube is experimentally investigated in the present study. A thin-walled steel tube is subjected to linear and nonlinear loading paths. For the linear loadings, a ratio of the displacement and rotation of a grip is fixed at constant. Experimentally measured plastic flow is well predicted by the associated flow rule based on an anisotropic yield function at least for the linear loadings. In the nonlinear loadings, the specimen is subjected to the uniaxial tension followed by the simultaneous application of the axial load and torsion. The plastic flow directions in the nonlinear loadings do not agree with those for the linear loadings even though the stress states are identical. These experimental trends cannot be reproduced by the associated flow rule. We have found the linear relationship between the direction of plastic strain rate and the direction of strain rate. Therefore, the experimental data indicates that the direction of plastic flow can be represented by the direction of the strain rate as well as the stress state.
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Article Access Ranking

23 Nov. (Last 30 Days)

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  1. blast furnace
  2. blast furnace productivity
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  6. breakout continuous casting
  7. breakout prediction, continuous casting
  8. camp-isij
  9. cold reduction recrystallization
  10. cold reduction recrystallization steel