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Phase transformation studies at the solid/liquid interface by directional solidification of Alloy 718

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Abstract

The phase transformation temperatures are especially important in alloy 718 because it requires careful heattreatment cycles. The DTA method is generally used to estimate the characteristic temperatures of phase transformations. However, DTA is an indirect method to confirm phase transformations, and there are always discrepancies in analyzing the DTA thermograms. In this study, the directional solidification and quenching technique has been applied to estimate the phase transformation temperatures near the solid/liquid interface temperatures by measuring temperatures directly during directional solidification. These phase transformation temperatures were confirmed in the quenched solid/liquid interface. Solidification behavior at the solid/liquid interface with solidification rate and temperature gradient were also discussed.

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Authors and Affiliations

  1. Department of Metallurgical Engineering, Pusan National University, San 31 Changjeon-dong, 609-735, Kumjung-ku, Pusan, Korea

    Dong-Kyu Oh & Sang-Lae Lee

  2. Materials Processing Department, Korea Institute of Machinery and Materials, 66 Sangnam-dong, 641-010, Changwon, Korea

    Chang-Yong Jo

  3. Department of Metallurgy and Materials Science, Changwon National University, 9 Sarim-dong, 641-773, Changwon, Korea

    Hyun-Choul Kim & Je-Hyun Lee

Authors
  1. Dong-Kyu Oh
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  2. Chang-Yong Jo
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  3. Hyun-Choul Kim
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  4. Je-Hyun Lee
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  5. Sang-Lae Lee
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Oh, DK., Jo, CY., Kim, HC. et al. Phase transformation studies at the solid/liquid interface by directional solidification of Alloy 718. Metals and Materials 6, 311–315 (2000). https://doi.org/10.1007/BF03028077

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