Phase-field simulation of γ"(D022) precipitation in Ni base superalloys

被引：4
|
作者：
Koyama, Toshiyuki [1 ]
Onodera, Hidehiro [2 ]
机构：
[1] Natl Inst Mat Sci, Computat Mat Sci Ctr, 1-2-1 Sengen, Tsukuba, Ibaraki, Japan
[2] Natl Inst Mat Sci, Mat Engn Lab, Tsukuba, Ibaraki, Japan
来源：
PRICM 6: SIXTH PACIFIC RIM INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS AND PROCESSING, PTS 1-3 | 2007年 / 561-565卷
基金：
日本科学技术振兴机构;
关键词：
phase-field method; phase transformation; phase decomposition; diffusion equation; precipitation; superalloy; Ni-V; elastic strain energy;
D O I：
10.4028/www.scientific.net/MSF.561-565.2287
中图分类号：
TF [冶金工业];
学科分类号：
0806 ;
摘要：
Although the gamma ''(D0(22)) phase has been known as a strengthen phase for the turbine disk of wrought Ni-base superalloys, the computer simulation of the gamma ''(D0(22)) precipitation is hardly performed. In this study, it is demonstrated that the phase-field modeling of the complex microstructure developments including gamma ''(D0(22)) precipitation in Ni-V-X (X=Co,Nb,Fe) alloys. The simulation results obtained are as follows: (1) The complex morphologies of the gamma(Al)+gamma ''(D0(22)) two-phase microstructure, such as the maze-micro structure, 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.
引用
收藏
页码：2287 / +
页数：2
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