Phase-Field Simulation on the Formation and Collapse Processes of the Rafted Structure in Ni-Based Superalloys

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  • Tsukada Yuhki
    Department of Materials, Physics and Energy Engineering, Graduate School of Engineering, Nagoya University
  • Murata Yoshinori
    Department of Materials, Physics and Energy Engineering, Graduate School of Engineering, Nagoya University
  • Koyama Toshiyuki
    National Institute for Materials Science
  • Morinaga Masahiko
    Department of Materials, Physics and Energy Engineering, Graduate School of Engineering, Nagoya University

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In Ni-based superalloys, the rafted structure is known to form in the early stage of creep and to get into wavy morphology in the final stage of creep at elevated temperatures. This rafting phenomenon is essentially related to the anisotropic relaxation of the lattice misfit between the γ and γ′ phases due to the creep strain under the external stress. In this study, in order to simulate comprehensively from the formation to collapse processes of the rafted structure by the phase-field method, a new idea that the anisotropy increases with simulation time is employed in the calculation of the elastic strain energy in alloy. This idea corresponds to the phenomenon that creep strain increases with creep time. The results are in good agreement with the microstructural change observed in practical Ni-based alloys.

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