Analysis Method for Recalescence Time Obtained Using High-Speed Camera for Solidification Experiments at the Electrostatic Levitation Furnace in the International Space Station

DOI
  • MABUCHI Yuji
    Department of Materials Science, Waseda University
  • HANADA Chihiro
    Department of Applied Mechanics and Aerospace Engineering, Waseda University
  • UEDA Yuto
    Department of Applied Mechanics and Aerospace Engineering, Waseda University
  • KADOI Koei
    Department of Applied Mechanics and Aerospace Engineering, Waseda University
  • AOKI Hirokazu
    Department of Applied Mechanics and Aerospace Engineering, Waseda University
  • SAGUCHI Ryosei
    Department of Physical Science and Engineering, Nagoya Institute of Technology
  • YAMADA Motoko
    Department of Physical Science and Engineering, Nagoya Institute of Technology
  • SATO Hisashi
    Department of Physical Science and Engineering, Nagoya Institute of Technology
  • WATANABE Yoshimi
    Department of Physical Science and Engineering, Nagoya Institute of Technology
  • OZAWA Shumpei
    Department of Advanced Materials Science and Engineering, Chiba Institute of Technology
  • SHIRATORI Suguru
    Department of Mechanical Systems Engineering, Tokyo City University
  • NAKANO Shizuka
    Henry Monitor Inc.
  • KOYAMA Chihiro
    Japan Aerospace Exploration Agency (JAXA)
  • ODA Hirohisa
    Japan Aerospace Exploration Agency (JAXA)
  • ISHIKAWA Takehiko
    Japan Aerospace Exploration Agency (JAXA)
  • WATANABE Yuki
    Advanced Engineering Services Co., Ltd. (AES)
  • SUZUKI Shinsuke
    Department of Materials Science, Waseda University Department of Applied Mechanics and Aerospace Engineering, Waseda University Kagami Memorial Research Institute for Materials Science and Technology, Waseda University

抄録

This study was designed as a preliminary experiment for missions at the electrostatic levitation furnace in the International Space Station (ISS-ELF) such as Hetero-3D. The objective of this study was to employ a high-speed camera to determine the recalescence time of undercooled Ti6Al4V alloy with TiC heterogeneous nucleation site particles more accurately compared to measurements using a pyrometer. The sample was melted and solidified in the ground-based electrostatic levitation (ESL) furnace. The changes in the luminescence emitted from the sample surface due to recalescence were recorded using a high-speed camera, and the intensity at the center of each captured image was analyzed with MATLAB® software. As a result, the intensity of the undercooled samples increased significantly during recalescence. The maximum change in the intensity was 101 per 256 gray levels in the recording at 7,200 frames per second (fps) and the noise was at most only 3. Therefore, the recalescence time could be obtained using the high-speed camera. At 15,000 fps, the recalescence time was within 6.7 × 10-5 s, which was much more accurate than the time (0.11 s) measured using a pyrometer at a sampling rate of 120 Hz in the ESL furnace. For enhanced measurement accuracy, it is crucial to establish an appropriate exposure time to prevent the intensity from reaching the lower limit of 0 just before recalescence and the upper limit of 255 immediately after that. This study suggests that the high-speed camera newly installed in the ISS-ELF in 2023 may have the potential to achieve a more accurate recalescence time than the pyrometer at a sampling rate of 100 Hz in the ISS-ELF.

収録刊行物

詳細情報 詳細情報について

  • CRID
    1390298986212932608
  • DOI
    10.15011/jasma.41.410101
  • ISSN
    21889783
  • 本文言語コード
    en
  • データソース種別
    • JaLC
  • 抄録ライセンスフラグ
    使用可

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