Inconel 718 thin walls were fabricated via electron beam directed energy deposition (EB-EDE) to investigated their microstructure and mechanical properties in terms of the deposition modes. Results revealed that the deposition modes had great effects on the microstructural evolution and thus influenced the mechanical properties. The layered nature and the fine dendrites were produced by the intermittent deposition, while the coarse and irregular cellular crystals were formed under the continuous deposition. The harmful Laves phase was precipitated under both deposition modes. The microhardness and tensile strength of the build-ups deposited intermittently were higher because there were fewer Laves phase. This work provided a new perspective to explain the microstructure differences of multi-layered components formed by EB-DED.

中文翻译：

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沉积模式对电子束定向能量沉积铬镍铁合金 718 的影响

Inconel 718 薄壁是通过电子束定向能量沉积 (EB-EDE) 制造的，以根据沉积模式研究其微观结构和机械性能。结果表明，沉积模式对微观结构演变有很大影响，从而影响力学性能。断续沉积形成层状结构和细小枝晶，连续沉积形成粗大不规则的胞状晶体。在两种沉积模式下都会沉淀出有害的 Laves 相。由于 Laves 相较少，间歇沉积的堆积物的显微硬度和抗拉强度较高。这项工作为解释EB-DED形成的多层组件的微观结构差异提供了新的视角。