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

Title:

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

Abstract

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
Refereed:Yes
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 By: AHMAD MOSTAFA
Deposited On:01 Jun 2017 13:02
Last Modified:18 Jan 2018 17:55
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