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ASEAN Journal on Science and Technology for Development

Abstract

The additive manufacturing (AM) technique “Direct Metal Laser Sintering (DMLS)” is used to create 3D objects directly from 3D design data. A lightweight and complexity-free part without any expensive tooling can be fabricated easily using this method, but it is still challenging to achieve the desired mechanical strength from AM parts, as the mechanical properties of AM-produced parts vary with orientation, scan strategy, and process parameters. Inconel 718 alloy is most commonly utilized in the aerospace and automotive industries, because of its high resistance to corrosion and excellent mechanical qualities. This work presents a study to investigate the orientation-based mechanical behaviour of the AM-produced Inconel 718 alloy. Samples were fabricated in three building directions: horizontal (0o), inclined (45o), and vertical (90o). Tensile tests and fractography were performed. It was observed that a 0o build produces almost 6.2% higher tensile strength and approximately 6.69% higher elongation than a 90o build sample. Also, all the samples observed ductile failure with an elongation of more than 35%.

Keywords

Additive Manufacturing, Inconel 718 alloy, Build orientation, Tensile property, and Fractography.

Publication Date

2025

Received Date

04/12/2023

Revised Date

05/12/2024

Accepted Date

26/12/2024

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