Abstract In order to decrease deformation and stress in powder-bed electron beam melting, clarification of the characteristics of strain and stress formation during the melting process would be of great benefit. We developed an FE-based 3D thermal elastoplastic model with a Gaussian heat flux distribution profile in raster scanning pattern for Ni superalloy “Rene 80” It was confirmed that strain variation in simulation showed good agreement with values calculated by a proposed mechanical model and proved to be quantitatively valid. The stress distribution during the melting process showed anisotropy in that the stresses in the beam scanning direction were higher than those in the other directions. The anisotropy formation mechanism was explicable by plastic strain anisotropy dominated by the restraint condition in that orthogonal direction was free boundary and lengthwise direction was subjected to restraint.

中文翻译：

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粉末床电子束熔炼镍高温合金熔炼过程中应力应变形成的模拟研究

摘要 为了减少粉末床电子束熔炼过程中的变形和应力，明确熔炼过程中应变和应力形成的特征将大有裨益。我们开发了一种基于 FE 的 3D 热弹塑性模型，在光栅扫描模式中为 Ni 高温合金“Rene 80”开发了高斯热流分布曲线。经证实，模拟中的应变变化与建议的机械模型计算的值非常吻合，并证明在数量上是有效的。熔化过程中的应力分布呈现各向异性，梁扫描方向的应力高于其他方向的应力。