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Microsegregation and Secondary Phase Formation During Directional Solidification of the Single-Crystal Ni-Based Superalloy LEK94

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Abstract

A multicomponent phase-field method coupled to thermodynamic calculations according to the CALPHAD method was used to simulate microstructural evolution during directional solidification of the LEK94 commercial single-crystal Ni-based superalloy using a two-dimensional unit cell approximation. We demonstrate quantitative agreement of calculated microsegregation profiles and profiles determined from casting experiments as well as calculated fraction solid curves with those determined in differential thermal analysis (DTA) measurements. Finally, the role of solidification rate on dendrite morphology and precipitation of the secondary phases is investigated and a new measure of the dendrite morphology is presented to quantify the effect of back diffusion on the amount of secondary phases.

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Acknowledgments

This work was supported by the state of North Rhine-Westphalia through the Materials Research Department and the support from ICAMS sponsors. The authors acknowledge funding by the Deutsche Forschungsgemeinschaft (DFG) through projects B4, C5, and C6 of SFB/Transregio 103.

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Authors and Affiliations

  1. Lehrstuhl Werkstofftechnik, Ruhr-Universität Bochum, 44780, Bochum, Germany

    Inmaculada Lopez-Galilea (Scientist), Stephan Huth (Junior Professor) & Werner Theisen (Professor and Dean)

  2. Research Department IS3/HTM, Ruhr-Universität Bochum, 44780, Bochum, Germany

    Inmaculada Lopez-Galilea (Scientist)

  3. STKS, Scale Bridging Thermodynamic and Kinetic Simulation, Ruhr-Universität Bochum, 44780, Bochum, Germany

    Suzana G. Fries (Project Leader) & Ingo Steinbach (Professor)

  4. Metallurgy and Materials, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK

    Nils Warnken (Researcher)

Authors
  1. Inmaculada Lopez-Galilea
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  2. Stephan Huth
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  3. Suzana G. Fries
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  4. Nils Warnken
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  5. Ingo Steinbach
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  6. Werner Theisen
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Correspondence to Inmaculada Lopez-Galilea.

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Manuscript submitted September 20, 2011.

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Lopez-Galilea, I., Huth, S., Fries, S.G. et al. Microsegregation and Secondary Phase Formation During Directional Solidification of the Single-Crystal Ni-Based Superalloy LEK94. Metall Mater Trans A 43, 5153–5164 (2012). https://doi.org/10.1007/s11661-012-1327-x

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  • DOI: https://doi.org/10.1007/s11661-012-1327-x

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