Wire arc additive manufacturing (WAAM) with better material utilisation efficiency and higher deposition rate was employed to fabricate bi-metallic structure (BMS) of non-stabilised austenitic stainless steel (SS904L), and solid solution strengthened Hastelloy C-276. The micrographs confirmed the existence of directionally elongated, columnar, and equi-axed dendrites in the BMS. Significant grain coarsening was observed in the re-melted layers. The tensile properties of Hastelloy C-276 and SS904L were comparable with wrought counterparts, while the bi-metallic interface sample fractured in the SS904L side. The presence of secondary phases and varying microstructure along the building direction is responsible for the anisotropy in mechanical properties. Microhardness results revealed the steep increase at the bi-metallic interface due to the dilution of elements between two materials.

中文翻译：

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电弧增材制造双金属结构的显微组织和力学性能

采用具有更好材料利用率和更高沉积率的电弧增材制造（WAAM）制造非稳定奥氏体不锈钢（SS904L）和固溶强化哈氏合金C-276的双金属结构（BMS）。显微照片证实了 BMS 中存在定向拉长、柱状和等轴枝晶。在重熔层中观察到显着的晶粒粗化。Hastelloy C-276 和 SS904L 的拉伸性能与锻件相当，而双金属界面样品在 SS904L 一侧断裂。第二相的存在和沿构建方向变化的微观结构是造成机械性能各向异性的原因。