A new phase-field method for simulating γ′ precipitation in multicomponent nickel-base superalloys

被引：63

作者：

Kitashima, T. ^{[1
]}

Harada, H. ^{[1
]}

机构：

[1] Natl Inst Mat Sci, High Temp Mat Ctr, Tsukuba, Ibaraki 3050047, Japan

来源：

ACTA MATERIALIA | 2009年 / 57卷 / 06期

关键词：

Ni-base superalloys; Phase-field modeling; CALPHAD; Multicomponent; Order-disorder phenomena; SINGLE-CRYSTAL SUPERALLOYS; CLUSTER VARIATION METHOD; ATOM-PROBE; COARSENING KINETICS; MICROSTRUCTURE EVOLUTION; THERMODYNAMIC DATABASE; COMPUTER-SIMULATION; DIFFUSION COUPLES; CALPHAD METHOD; FREE-ENERGY;

D O I：

10.1016/j.actamat.2009.01.006

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The phase-field method is used to develop a new technique to simulate gamma' precipitation in multicomponent Ni-base superalloys. This technique generates the Gibbs free energy for both the gamma and gamma' phases from the single function formalism of both phases in the CALPHAD method Without using conventional CALPHAD software. The Gibbs free energy surfaces for eight- element multicomponent systems are used to confirm that there is an accurate coupling with the CALPHAD method. because they compare favorably with calculated results from Thermo-Calc. In addition, gamma' precipitation in a third-generation Ni-base superalloy containing eight components is simulated in one dimension with anti-phase effects of the gamma' phase on the precipitate interactions, The simulation results reveal late-stage enrichments of Re and W in the gamma phase during coalescence of the gamma' precipitates. (C) 2009 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：2020 / 2028

页数：9

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