Traditional manufacturing of Inconel 718 components from castings and thermomechanical processing routes involve extensive post processing and machining to attain the desired geometry. Additive manufacturing (AM) technologies including direct energy deposition (DED), selective laser melting (SLM), electron beam melting (EBM) and binder jet 3D printing (BJ3DP) can minimize scrap generation and reduce lead times. While there is extensive literature on the use of melting and solidification based AM technologies, there has been limited research on the use of binder jet 3D printing. In this paper, a brief review on binder jet additive manufacturing of Inconel 718 is presented. In addition, existing knowledge on sintering of Inconel 718 has been extended to binder jet 3D printing. We found that supersolidus liquid phase sintering (SLPS) is necessary to achieve full densification of Inconel 718. SLPS is sensitive to the feedstock chemistry that has a strong influence on the liquid volume fraction at the processing temperature. Based on these results, we discuss an empirical framework to determine the role of powder particle size and liquid volume fraction on sintering kinetics. The role of powder packing factor and binder saturation on microstructural evolution is discussed. The current challenges in the use of BJ3DP for fabrication of Inconel 718, as well as, extension to other metal systems, are presented.

由铸件和热机械加工路线进行的Inconel 718组件的传统制造涉及大量的后加工和机加工，以达到所需的几何形状。包括直接能量沉积（DED），选择性激光熔化（SLM），电子束熔化（EBM）和粘合剂喷射3D打印（BJ3DP）在内的增材制造（AM）技术可以最大程度地减少废料的产生并缩短交货时间。尽管有大量关于基于熔化和固化的增材制造技术使用的文献，但是对使用粘结剂喷射3D打印的研究还很有限。在本文中，简要介绍了Inconel 718的粘合剂喷射增材制造。此外，有关Inconel 718烧结的现有知识已扩展到粘合剂喷射3D打印。我们发现超固相液相烧结（SLPS）对于实现Inconel 718的完全致密化是必要的。SLPS对原料化学敏感，在加工温度下对液体体积分数有很大影响。基于这些结果，我们讨论了确定粉末粒度和液体体积分数对烧结动力学的作用的经验框架。讨论了粉末堆积因子和粘结剂饱和度对微观组织演变的作用。提出了在使用BJ3DP制造Inconel 718以及扩展到其他金属系统方面的当前挑战。我们讨论了确定粉末粒度和液体体积分数对烧结动力学的作用的经验框架。讨论了粉末堆积因子和粘合剂饱和度对微结构演变的作用。提出了在使用BJ3DP制造Inconel 718以及扩展到其他金属系统方面的当前挑战。我们讨论了确定粉末粒度和液体体积分数对烧结动力学的作用的经验框架。讨论了粉末堆积因子和粘结剂饱和度对微观组织演变的作用。提出了在使用BJ3DP制造Inconel 718以及扩展到其他金属系统方面的当前挑战。