Phase Field Simulation of the Collapse of the Rafted Structure in Ni-Based Superalloys

Abstract:

Microstructural evolution in single crystal Ni-based superalloys is investigated by the phase field simulation. During creep, the morphology of the γ phase changed from the cuboidal shape to the rafted one, and the rafted structure was collapsed in the late stage of creep. The simulation on the microstructural evolution is based on thermodynamic information, diffusion equation, elastic anisotropy and a homogeneous lattice misfit. It is found that caused by external stress result in the morphological change of the γ phase to the rafted structure, and this rafted structure is collapsed by inhomogeneous lattice misfit. These morphological changes can be explained by the change in stable morphology of the γ phase.

• Periodical: Defect and Diffusion Forum (Volumes 326-328)
• Pages: 446-451
• DOI: https://doi.org/10.4028/www.scientific.net/DDF.326-328.446
• Online since: April 2012
• Authors: Toshiya Tanimoto, Yuhki Tsukada, Yoshinori Murata, Toshiyuki Koyama
• Keywords: Nickel-Based Superalloy, Phase Field, Rafting

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