Phase-Field Simulation of γ"(D022) Precipitation in Ni Base Superalloys

Abstract:

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Although the γ"(D022) phase has been known as a strengthen phase for the turbine disk of wrought Ni-base superalloys, the computer simulation of the γ"(D022) precipitation is hardly performed. In this study, it is demonstrated that the phase-field modeling of the complex microstructure developments including γ"(D022) precipitation in Ni-V-X (X=Co,Nb,Fe) alloys. The simulation results obtained are as follows: (1) The complex morphologies of the γ(A1)+γ"(D022) two-phase microstructure, such as the maze-microstructure, the chessboard-microstructure, and the chessboard-like microstructure, in Ni-V-X (X=Co,Nb,Fe) alloys are simulated reasonably by using phase-field method. (2) The morphology of the microstructure is mainly controlled by the elastic strain energy induced from the lattice mismatch. In particular, the tetragonal distortion is a key parameter to control and understand the complex microstructure changes.

Info:

Periodical:

Materials Science Forum (Volumes 561-565)

Main Theme:

Edited by:

Young Won Chang, Nack J. Kim and Chong Soo Lee

Pages:

2287-2292

DOI:

10.4028/www.scientific.net/MSF.561-565.2287

Citation:

T. Koyama and H. Onodera, "Phase-Field Simulation of γ"(D022) Precipitation in Ni Base Superalloys", Materials Science Forum, Vols. 561-565, pp. 2287-2292, 2007

Online since:

October 2007

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$35.00

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