Mechanical and microstructural characterisation on direct metal laser sintered Inconel 718 Online publication date: Tue, 24-Jul-2018
by A.N. Jinoop; S. Kanmani Subbu; R. Arockia Kumar
International Journal of Additive and Subtractive Materials Manufacturing (IJASMM), Vol. 2, No. 1, 2018
Abstract: Direct metal laser sintering (DMLS) is one of the additive manufacturing technologies which allows the fabrication of complex components in layer by layer technique with melting and solidification of powder raw material by laser heat source. This paper investigates about the mechanical and microstructural characteristics such as bulk density, porosity, micro hardness and surface roughness on Inconel 718, a nickel super alloy made by using DMLS. Bulk density and porosity finds good agreement with the components fabricated by casting. Microhardness and surface roughness along the surface of the component was investigated and also surface roughness along the build direction was inspected. The phases present in the processed Inconel 718 was found by using X-ray diffractometre. Optical microscopy and scanning electron microscopy was used to examine and understand the microstructure of as-built Inconel 718 without post-processing effects.
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