Phase-field modeling of the γ′-coarsening behavior in Ni-based superalloys

被引:85
作者
Kundin, J. [1 ]
Mushongera, L. [1 ]
Goehler, T. [2 ]
Emmerich, H. [1 ]
机构
[1] Univ Bayreuth, D-95448 Bayreuth, Germany
[2] MTU Aero Engines GmbH, Munich, Germany
关键词
Phase transformation; Diffusion; Coarsening; Elastic behavior; Phase-field modeling; SIMULATIONS; KINETICS;
D O I
10.1016/j.actamat.2012.03.023
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Microstructural changes during heat treatment of the Ni-based CMSX-4 and CMSX-6 superalloys have been investigated experimentally and simulated using a phase-field multi-component model incorporating elastic driving forces in the presence of a lattice misfit. Furthermore, a theoretical model of the coarsening of anisotropic particles is proposed for the prediction of the main kinetic parameters of the coarsening process. A comparison of the main characteristics of the microstructural evolution during non-directional gamma'-coarsening, provided from both experiments and phase-field simulations, gives a good agreement of the coarsening kinetics of the CMSX-4 superalloy. However, for the CMSX-6 superalloy, phase-field simulation results and theoretical predictions are not entirely consistent with experimental results, and show that additional effects, for example, those caused by plastic deformation, might be a reason for the slow coarsening rate. (C) 2012 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码:3758 / 3772
页数:15
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