Mostafa, Ahmad, Rubio, Ignacio Picazo, Brailovski, Vladimir, Jahazi, Mohammad and Medraj, Mamoun.
2017.
« Structure, texture and phases in 3D printed IN718 alloy subjected to homogenization and HIP treatments ».
Metals, vol. 7, nº 6.
Compte des citations dans Scopus : 202.
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Jahazi M 2017 15497 Structure texture and phases in 3D.pdf - Published Version Use licence: Creative Commons CC BY. Download (11MB) | Preview |
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.
| Item Type: | Peer reviewed article published in a journal |
|---|---|
| Additional Information: | Mostafa, Ahmad, Ignacio Picazo Rubio, Vladimir Brailovski, Mohammad Jahazi et Mamoun Medraj. 2017. « Erratum: Structure, texture and phases in 3D printed IN718 alloy subjected to homogenization and HIP treatments ». Metals, vol. 7, no 8. |
| Professor: | Professor Brailovski, Vladimir Jahazi, Mohammad |
| Affiliation: | Génie mécanique, Génie mécanique |
| Date Deposited: | 26 Jun 2017 18:05 |
| Last Modified: | 13 Apr 2023 16:08 |
| URI: | https://espace2.etsmtl.ca/id/eprint/15497 |
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