Time-resolved and <i>In-situ</i> Observation of δ-γ Transformation during Unidirectional Solidification in Fe-C Alloys

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  • Fe-C鋼の一方向凝固過程におけるδ-γ変態の時間分解・その場観察
  • Fe-Cコウ ノ イチホウコウ ギョウコ カテイ ニ オケル d-gヘンタイ ノ ジカン ブンカイ ・ ソノ バ カンサツ

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<p>Time-resolved and in-situ observations using synchrotron radiation X-rays successfully proved that the massive-like transformation, in which the γ phase was produced through the solid – solid transformation and the partition of substitute elements such as Mn and Si at the δ/γ interface could be negligibly small, was selected in the unidirectional solidification of 0.3 mass%C steel at a pulling rate of 50 μm/s. The massive-like transformation produced fine γ grains in the vicinity of the front of δ/γ interface. The coarse γ grains also grew behind the fine γ grains along the temperature gradient. Distance between the δ/γ front and the advancing front of coarse γ grains was as short as 200 μm. Namely, the fine γ grains disappeared within 10 s by the growth of coarsen γ grains along the temperature gradient. In addition, the observation of the δ/γ interface confirmed that a transition from the diffusion-controlled γ growth to the massive-like growth of γ phase occurred at a growth rate of 5 μm/s. Thus, the massive-like transformation is dominantly selected in the carbon steel during conventional solidification processes.</p>

Journal

  • Tetsu-to-Hagane

    Tetsu-to-Hagane 105 (2), 290-298, 2019

    The Iron and Steel Institute of Japan

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