Abstract Based on the principle of additive manufacturing in a layer-by-layer manner, a new electron beam smelting layered solidification technology (EBS-LST) was curried out to fabricated Inconel 718 superalloy. The microsegregation coefficient and the redistribution were calculated. A well-recognized model associated with secondary dendrite arm spacing was used to investigate the cooling rate during the solidification. The distribution of the surface temperature of the molten pool during EBS-LST was calculated based on the Gaussian distribution. The results show that there is a dendritic-cellular interface with a width of 400 μm between the layers, and the secondary dendrite arm spacing approximates 23 μm. The value of microsegregation coefficient of Nb, Mo and Ti is approximately 1.97, 1.52 and 1.13, respectively. Its solute distribution is more uniform than conventional processes, which attributed to the high cooling rate of the solidification process.

中文翻译：

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电子束熔炼分层凝固技术制备Inconel 718高温合金的微观偏析行为

摘要 基于逐层增材制造的原理，采用新型电子束熔炼分层凝固技术（EBS-LST）制备Inconel 718高温合金。计算微偏析系数和再分布。与二次枝晶臂间距相关的公认模型用于研究凝固过程中的冷却速率。基于高斯分布计算 EBS-LST 过程中熔池表面温度的分布。结果表明，层间存在宽度为400 μm的树突-细胞界面，二次枝晶臂间距约为23 μm。Nb、Mo 和Ti 的微偏析系数值分别约为1.97、1.52 和1.13。