Microstructural Features and Mechanical Integrity of Wire Arc Additive Manufactured SS321/Inconel 625 Functionally Gradient Material

The additively fabricated functionally gradient structures can be a potential replacement for conventionally manufactured via fusion welding techniques. A SS321/Inconel 625 material was processed by wire arc additive manufacturing (WAAM) process. WAAM-formed SS321 comprises of equiaxed and columnar structures, while the Inconel consists dendritic structures. It concluded that very narrow interface formed between FGM without forming cracks or fissures. Energy-dispersive x-ray spectroscopy (EDS) element maps show smooth transition elements at much segregation EDS point scan confirmed presence laves phase. electron backscatter diffraction results region revealed continuous crystallographic growth with large elongated grains in <001> orientation. Tensile properties were better comparable than wrought alloys, sample failed on side. micro-hardness steadily changed from 226-195 HV 272-236 625, respectively. WAAM process demonstrates successful components multi-material controlled properties.