Abstract
The current study focusses in evaluating the mechanical properties (yield strength, ultimate tensile strength and elongation %) and microstructures of as printed and heat treated tensile samples produced by Selective Laser Melting (SLM) which is an Additive Manufacturing (AM) technique. The as printed IN625 alloy exhibited good mechanical properties as compared to cast and wrought alloy, owing to fast cooling rates that give very fine dendritic/cellular structures during the SLM process. Standard solutionizing and precipitation hardening treatment was given to the SLM as printed samples. The as printed sample’s ductility increased from 30% elongation to 47% elongation with small drop in tensile strength from 878MPa to 836MPa. The increase of ductility after heat treatment was evident in the change of fracture morphology from long straight striations with dimple shape ductile like features in the as printed sample to mainly dimple shaped ductile-like fracture surface in the heat treated sample as observed in the FESEM.
Highlights
Additive Manufacturing (AM) techniques apply the addition of material layer by layer by providing thermal energy to melt powders and fabricate the final near net shape part
This paper investigated on the mechanical properties and microstructures of as Selective Laser Melting (SLM) printed IN625 samples before and heat treatment the mechanical properties and microstructures were compared with the cast and wrought IN625 samples
The microstructures of as printed IN625 samples have long columnar grains along the build direction as seen in Fig 2, and the build layers formed horizontal to build direction are visible after etching of the samples
Summary
Additive Manufacturing (AM) techniques apply the addition of material layer by layer by providing thermal energy to melt powders and fabricate the final near net shape part. Selective Laser Melting (SLM) technique which falls under the gamut of AM techniques is a powder bed process where a high powered laser scans the powder to melt and solidify to a dense near net shape part [1].SLM has the ability to build complex designs, thin walled structures with density close to 99.9% of the theoretical density. The mechanical properties of the as SLM printed IN625 samples have high strength but are low in ductility[3].Post heat treatment of the SLM printed parts could provide a workable solution to modify the microstructures and tailor the properties further to suit the application. This paper investigated on the mechanical properties and microstructures of as SLM printed IN625 samples before and heat treatment the mechanical properties and microstructures were compared with the cast and wrought IN625 samples
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