Computer simulation of the initial rafting process of a nickel-base single-crystal superalloy

被引：0

作者：

Feng, Hua ^{[1
]}

Biermann, Horst ^{[1
]}

Mughrabi, Haeel ^{[1
]}

机构：

[1] Universitaet Erlangen-Nuernberg, Erlangen, Germany

来源：

| 2000年 / Minerals, Metals & Materials Soc (TMS), United States卷 / 31期

关键词：

Computer simulation - Deformation - Finite element method - Lattice constants - Morphology - Perturbation techniques - Residual stresses - Single crystals - Strain - Superalloys;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

Rafting of the γ/γ′ morphology of nickel-base superalloys is a well-known phenomenon during high-temperature deformation. The initial stages of this type of directional coarsening were modeled two-dimensionally by the method of finite elements (FEs) using an energy-perturbation approach. In addition to the elastic energy density, the effect of the local difference of the hydrostatic stresses in γ and γ′ in combination with the different lattice parameters of the two phases was considered in the calculations as a further driving force. From the results of modeling, the deformation-induced internal stresses and strains were determined and used to evaluate the direction-dependent lattice parameters and lattice misfits of the two phases. The results agree well with experimentally determined values.

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