IJPEM
Investigations on Deposition Geometry and Mechanical Properties of Wire Arc Additive Manufactured Inconel 625
Kuntal Maji/National Institute of Technology Jamshedpur
- Keywords : Wire arc additive manufacturing Super alloy Deposition geometry Mechanical properties Anisotropy Heterogeneity
- In this article, deposition geometry and mechanical properties of Inconel 625 alloy fabricated by wire arc additive manufacturing (WAAM) using gas metal arc welding principle were investigated. Parametric study and optimization of deposition geometry expressed in terms of width, height and cross-sectional area, were carried out considering the input variables such as voltage, wire feed rate, travel speed, and gas flow rate based on Box–Behnken design of experiments and response surface methodology. Mechanical properties of WAAM Inconel 625 were investigated using tensile testing, microhardness tests and fracture morphology of deposited thin wall geometry of Inconel 625. Tensile tests of samples were prepared in different orientations showed anisotropy existed in mechanical properties of the deposited wall, and the tensile properties of longitudinal direction were seen to be higher than the other two directions. Also, the tensile strength of longitudinal direction was highest near-substrate region and successively decreased towards the built direction. Microhardness study in different locations of the deposited wall showed highest value at the bottom region and successively reduced values along the built direction. Fracture morphology and microstructures with compositional analysis were performed on the fabricated wall structure using SEM. The microstructures of Inconel 625 were composed of columnar dendritic structure and tensile specimen fractures showed sharp tearing edges and dimpled surfaces indicative of good layer bonding with ductile failure morphology.
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