Characterization of dendritic growth in Fe-C system using time-resolved X-ray tomography and physics-based filtering

H. Yasuda, T. Kawarasaki, Y. Tomiyori, Y. Kato, K. Morishita

研究成果: ジャーナルへの寄稿Conference article

抄録

Time-resolved in situ tomography of dendritic growth in Fe-0.45 mass% C carbon steel was performed using synchrotron radiation X-rays at SPring-8 synchrotron radiation facility (Japan) with improvement of the image quality using a physics-based filter. The voxel size of the reconstructed image was approximately 6.5 μm × 6.5 μm × 6.5 μm, and the time resolution (duration of 360° rotation) was 4 s (0.25 rps). Three-dimensional images of the dendrites were reconstructed even without image processing; however, the low contrast resolution in Fe-C alloys led to poor image quality. Consequently, it was impossible to precisely track the solid/liquid interface or evaluate the average curvature. To improve the image quality, a physics-based filter (a PF filter) was developed using a phase-field model. In the PF filter, images were retrieved in terms of interface curvature. The PF filter significantly improved the computed tomography image quality. As a result, dendritic growth was clearly observed even in Fe-C alloys. Moreover, the average curvature of the solid/liquid interface was evaluated as a function of solidification time (solid fraction). The ability to systematically characterize growing dendrites will be beneficial for modeling and simulation of solidification phenomena.

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Image quality
Tomography
Physics
X rays
Synchrotron radiation
Carbon steel
Solidification
Lead alloys
Liquids
Image processing

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Engineering(all)

これを引用

Characterization of dendritic growth in Fe-C system using time-resolved X-ray tomography and physics-based filtering. / Yasuda, H.; Kawarasaki, T.; Tomiyori, Y.; Kato, Y.; Morishita, K.

:: IOP Conference Series: Materials Science and Engineering, 巻 529, 番号 1, 012023, 17.06.2019.

研究成果: ジャーナルへの寄稿Conference article

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AU - Kawarasaki, T.

AU - Tomiyori, Y.

AU - Kato, Y.

AU - Morishita, K.

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AB - Time-resolved in situ tomography of dendritic growth in Fe-0.45 mass% C carbon steel was performed using synchrotron radiation X-rays at SPring-8 synchrotron radiation facility (Japan) with improvement of the image quality using a physics-based filter. The voxel size of the reconstructed image was approximately 6.5 μm × 6.5 μm × 6.5 μm, and the time resolution (duration of 360° rotation) was 4 s (0.25 rps). Three-dimensional images of the dendrites were reconstructed even without image processing; however, the low contrast resolution in Fe-C alloys led to poor image quality. Consequently, it was impossible to precisely track the solid/liquid interface or evaluate the average curvature. To improve the image quality, a physics-based filter (a PF filter) was developed using a phase-field model. In the PF filter, images were retrieved in terms of interface curvature. The PF filter significantly improved the computed tomography image quality. As a result, dendritic growth was clearly observed even in Fe-C alloys. Moreover, the average curvature of the solid/liquid interface was evaluated as a function of solidification time (solid fraction). The ability to systematically characterize growing dendrites will be beneficial for modeling and simulation of solidification phenomena.

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