Bi-metal structures fabricated by extrusion-based sintering-assisted additive manufacturing
Bi-metal structures fabricated by extrusion-based sintering-assisted additive manufacturing
复制标题
通过基于挤压的烧结辅助增材制造制造的双金属结构
DOI：
10.1016/j.jmapro.2023.05.025
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发表时间：
2023
影响因子：
6.2
通讯作者：
Ning, Fuda
中科院分区：
文献类型：
--
作者：
Jiang, Dayue;Ning, Fuda
双金属结构的制造受到了广泛的关注，因为它提供了单一金属合金的补偿性能，满足了航空航天、国防、能源等关键行业对零部件的苛刻要求。添加剂制造因其能够逐层改变材料类型和成分而被广泛应用于建造多材料结构。然而，基于熔融的AM技术通常会由于不同材料之间的热膨胀系数(CTE)失配而导致界面裂纹和分层，而固态AM方法在界面上会产生大量的气孔，需要进行后加工热处理。在这项研究中，我们的目标是建立高质量的17-4PH不锈钢和镍合金双金属组织的材料挤压AM方法，随后的脱脂和烧结工艺。对双金属结构的组织和力学性能进行了深入的研究。结果表明，整个组织中分布着细小的气孔，界面上没有形成脆性的金属间化合物相，但气孔稍大。材料过渡区的厚度相对较小，表现出低的结合强度和低的硬度，但具有延性变形行为。这项研究的完成为挤压烧结辅助AM建立的双金属结构提供了开创性的分析，并显示了该技术在各种工业应用中的进一步采用的巨大前景。
The manufacturing of bi-metal structure has received much interest because it provides compensated properties for a single metal alloy, meeting the harsh requirements for components used in key industries like aerospace, defense, energy, etc. Additive manufacturing (AM) has been extensively applied in building multi-material structures because of its ability to vary material type and composition in a layer-by-layer mode. However, fusion-based AM technologies usually induce interfacial cracks and delamination resulted from the large mismatch of coefficient of thermal expansion (CTE) between dissimilar materials, while the solid-state AM methods generate a large number of pores at the interface, requiring post-fabrication heat treatment. In this study, we aim to build high-quality 17–4 PH stainless steel and nickel alloy bi-metal structure with material extrusion AM method, followed by debinding and sintering processes. The microstructure and mechanical properties of the bi-metal structure were thoroughly investigated. It was revealed that small pores were distributed in the whole part, and no brittle intermetallic phase but slightly larger pores were formed at the interface. The material transition zone was relatively small in thickness, exhibiting low bonding strength and low hardness but a ductile deformation behavior. The completion of this study provides a pioneering analysis of bi-metal structures built by extrusion-based sintering-assisted AM, and shows a great promise for further adoption of this technology in a variety of industrial applications.
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