Abstract
Emerging engineering challenges, especially in extreme environments, often require parts whose properties vary as a function of position. By utilizing composition as a spatial parameter, multi-material additive manufacturing enables the fabrication of geometrically complex structures with controlled variations in physical and mechanical properties. Interfacial bonding and compositional dilution across the interface are key parameters that determine the performance of such multi-material parts. The present work explores interfacial phenomena in additively manufactured stainless steel 316L/Inconel 718 (SS316L/IN718) multi-material structures utilizing wire feedstocks. Interfacial characteristics were dependent on the deposition sequence. Deposition of IN718 on previously deposited SS316L led to epitaxial growth of IN718 grains on SS316L grains, with the formation of relatively flat, sharp interfaces adhering to the designed compositions. However, deposition of SS316L on previously deposited IN718 led to melt pool banding and significant dilution in composition. Further, redistribution of alloying elements and a lack of epitaxial growth were observed. Plausible driving mechanisms for the formation of such distinct interfaces have been discussed. The present work emphasizes the consideration of deposition sequence for the additive manufacturing of defect-free multi-material structures.
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S.G. acknowledges the Ministry of Education, Government of India for the award of the Prime Minister’s Research Fellowship (PMRF) for pursuing doctoral research.
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Goswami, S., Minnikanti, V.M.S.K., Mishra, S. et al. Interfacial Phenomena in Additively Manufactured Stainless Steel 316L/Inconel 718 Multi-Material Structures. Trans Indian Inst Met (2023). https://doi.org/10.1007/s12666-023-03204-9
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DOI: https://doi.org/10.1007/s12666-023-03204-9