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Prediction of microstructure evolution during high temperature blade forging of a Ni−Fe based superalloy, Alloy 718

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Abstract

The mechanical properties of the Ni−Fe-based Alloy 718 depend very much on grain size, as well as the strengthening phases, γ’ and γ. The grain structure of the superalloy components is mainly controlled during thermo-mechanical processes by the dynamic, meta-dynamic recrystallization and grain growth. In this investigation, the evolution of the grain structure in the process of two-step blade forging was experimentally and numerically dealt with. The evolution of the grain structure in Alloy 718 during blade forging was predicted using a 2-DFE simulator with implemented constitutive models on dynamic recrystallization and grain growth. The comparison of the simulated microstructure with the actual grain structure of the forged parts validated the prediction of the grain structure evolution. The effect of dynamic recrystallization on the evolution of grain structure is highlighted in this article.

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Authors and Affiliations

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

    Young -Sang Na, Jong -Taek Yeom & Nho -Kwang Park

  2. Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, 373-1 Guseong-dong, Yuseong-gu, 305-701, Daejeon, Korea

    Jai -Young Lee

Authors
  1. Young -Sang Na
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  2. Jong -Taek Yeom
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  3. Nho -Kwang Park
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  4. Jai -Young Lee
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Correspondence to Young -Sang Na.

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Na, Y.S., Yeom, J.T., Park, N.K. et al. Prediction of microstructure evolution during high temperature blade forging of a Ni−Fe based superalloy, Alloy 718. Met. Mater. Int. 9, 15–19 (2003). https://doi.org/10.1007/BF03027224

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  • DOI: https://doi.org/10.1007/BF03027224

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