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Structure, Texture and Phases in 3D Printed IN718 Alloy Subjected to Homogenization and HIP Treatments


Structure, Texture and Phases in 3D Printed IN718 Alloy Subjected to Homogenization and HIP Treatments

Mostafa, Ahmad ORCID: https://orcid.org/0000-0001-5625-1106, Picazo Rubio, Ignacio, Brailovski, Vladimir, Jahazi, Mohammad and Medraj, Mamoun (2017) Structure, Texture and Phases in 3D Printed IN718 Alloy Subjected to Homogenization and HIP Treatments. Metals, 7 (196). ISSN 2075-4701

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Official URL: https://doi.org/10.3390/met7060196


3D printing results in anisotropy in the microstructure and mechanical properties. The focus of this study is to investigate the structure, texture and phase evolution of the as-printed and heat treated IN718 superalloy. Cylindrical specimens, printed by powder-bed additive manufacturing technique, were subjected to two post-treatments: homogenization (1100 °C, 1 h, furnace cooling) and hot isostatic pressing (HIP) (1160 °C, 100 MPa, 4 h, furnace cooling). The Selective laser melting (SLM) printed microstructure exhibited a columnar architecture, parallel to the building direction, due to the heat flow towards negative z-direction. Whereas, a unique structural morphology was observed in the x-y plane due to different cooling rates resulting from laser beam overlapping. Post-processing treatments reorganized the columnar structure of a strong {002} texture into fine columnar and/or equiaxed grains of random orientations. Equiaxed structure of about 150 µm average grain size, was achieved after homogenization and HIP treatments. Both δ-phase and MC-type brittle carbides, having rough morphologies, were formed at the grain boundaries. Delta-phase formed due to γ″-phase dissolution in the γ matrix, while MC-type carbides nucleates grew by diffusion of solute atoms. The presence of (Nb0.78Ti0.22)C carbide phase, with an fcc structure having a lattice parameter a = 4.43 Å, was revealed using Energy dispersive spectrometer (EDS) and X-ray diffractometer (XRD) analysis. The solidification behavior of IN718 alloy was described to elucidate the evolution of different phases during selective laser melting and post-processing heat treatments of IN718

Divisions:Concordia University > Gina Cody School of Engineering and Computer Science > Mechanical and Industrial Engineering
Item Type:Article
Authors:Mostafa, Ahmad and Picazo Rubio, Ignacio and Brailovski, Vladimir and Jahazi, Mohammad and Medraj, Mamoun
Journal or Publication:Metals
Date:30 May 2017
Digital Object Identifier (DOI):10.3390/met7060196
Keywords:Inconel 718; additive manufacturing; 3D printing; hot isostatic pressing (HIP); homogenization treatment; selective laser melting (SLM); Electron backscattered diffraction (EBSD)
ID Code:982588
Deposited On:01 Jun 2017 13:02
Last Modified:18 Jan 2018 17:55
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