초록 열기/닫기 버튼
Directed energy deposition (DED) is an additive manufacturing technology involving a focused high-powerlaser or electron beam propagating over the substrate, resulting in melt pool formation while simultaneouslysupplying metal powder to the melt pool area to deposit the material. DED is performed to repair andstrengthen parts in various applications, as it can be easily integrate local area cladding and cross-materialdeposition. In this study, we characterize stainless steel 316 L parts fabricated via DED based on variousdeposition conditions and geometries to widen the application of DED. The deposition characteristics areinvestigated by varying the laser power and powder feed rate. Multilayer deposition with a laser power of 362W and a powder feed rate of 6.61 g/min indicate a height closest to the design value while affording highsurface quality. The microhardness of the specimen increases from the top to the bottom of the deposited area. Tensile tests of specimens with two different deposition directions indicate that horizontally long specimens withrespect to a substrate demonstrate a higher ultimate tensile strength and yield strength than vertically longspecimens with lower elongation.
키워드열기/닫기 버튼
Directed Energy Deposition(DED), Stainless Steel 316L, Hardness, Tensile Properties, Microstructure
