Controlling microstructural and mechanical properties of direct laser deposited Inconel 718 via laser power

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Controlling microstructural and mechanical properties of direct laser deposited Inconel 718 via laser power. / Alhuzaim, Abdullah; Imbrogno, Stano; Attallah, Moataz M.

In: Journal of Alloys and Compounds, Vol. 872, 159588, 15.08.2021.

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@article{2f20e2ae2ef3430a919a39f97156b766,
title = "Controlling microstructural and mechanical properties of direct laser deposited Inconel 718 via laser power",
abstract = "The control of grain structure, texture and micro-segregation during additive manufacturing is important due to their impact on the mechanical properties. In this work, multiple single walls were deposited using Inconel 718 powder by the Direct Laser Deposition (DLD) process. The influence of a wide range of laser power (150–1900 W), as well as the thermal gradient, were characterized using electron microscopy and hardness testing. The heat input effect on the microstructural, dendritic morphology, and microhardness was also examined. The results illustrated that a higher thermal gradient due to lower heat input tends to form equiaxed grains and more Nb-segregation, whilst a higher heat input develops columnar grains with low Nb-segregation. The segregations within the interdendritic boundaries increased in size when the heat input was increased, whilst the contribution from precipitation strengthening was not significantly evident in the as-fabricated condition. A wall with two different powers was also deposited to demonstrate the possibility of creating functionally graded structures through the control of laser power.",
keywords = "Direct laser deposition, Microstructure, Ni-superalloys, Segregation",
author = "Abdullah Alhuzaim and Stano Imbrogno and Attallah, {Moataz M.}",
note = "Funding Information: Abdullah Alhuzaim would like to acknowledge the Royal Commission for Jubail and Yanbu , Kingdom of Saudi Arabia and the EU 4D Hybrid for the financial support. ",
year = "2021",
month = aug,
day = "15",
doi = "10.1016/j.jallcom.2021.159588",
language = "English",
volume = "872",
journal = "Journal of Alloys and Compounds",
issn = "0925-8388",
publisher = "Elsevier",

}

RIS

TY - JOUR

T1 - Controlling microstructural and mechanical properties of direct laser deposited Inconel 718 via laser power

AU - Alhuzaim, Abdullah

AU - Imbrogno, Stano

AU - Attallah, Moataz M.

N1 - Funding Information: Abdullah Alhuzaim would like to acknowledge the Royal Commission for Jubail and Yanbu , Kingdom of Saudi Arabia and the EU 4D Hybrid for the financial support.

PY - 2021/8/15

Y1 - 2021/8/15

N2 - The control of grain structure, texture and micro-segregation during additive manufacturing is important due to their impact on the mechanical properties. In this work, multiple single walls were deposited using Inconel 718 powder by the Direct Laser Deposition (DLD) process. The influence of a wide range of laser power (150–1900 W), as well as the thermal gradient, were characterized using electron microscopy and hardness testing. The heat input effect on the microstructural, dendritic morphology, and microhardness was also examined. The results illustrated that a higher thermal gradient due to lower heat input tends to form equiaxed grains and more Nb-segregation, whilst a higher heat input develops columnar grains with low Nb-segregation. The segregations within the interdendritic boundaries increased in size when the heat input was increased, whilst the contribution from precipitation strengthening was not significantly evident in the as-fabricated condition. A wall with two different powers was also deposited to demonstrate the possibility of creating functionally graded structures through the control of laser power.

AB - The control of grain structure, texture and micro-segregation during additive manufacturing is important due to their impact on the mechanical properties. In this work, multiple single walls were deposited using Inconel 718 powder by the Direct Laser Deposition (DLD) process. The influence of a wide range of laser power (150–1900 W), as well as the thermal gradient, were characterized using electron microscopy and hardness testing. The heat input effect on the microstructural, dendritic morphology, and microhardness was also examined. The results illustrated that a higher thermal gradient due to lower heat input tends to form equiaxed grains and more Nb-segregation, whilst a higher heat input develops columnar grains with low Nb-segregation. The segregations within the interdendritic boundaries increased in size when the heat input was increased, whilst the contribution from precipitation strengthening was not significantly evident in the as-fabricated condition. A wall with two different powers was also deposited to demonstrate the possibility of creating functionally graded structures through the control of laser power.

KW - Direct laser deposition

KW - Microstructure

KW - Ni-superalloys

KW - Segregation

UR - http://www.scopus.com/inward/record.url?scp=85103779215&partnerID=8YFLogxK

U2 - 10.1016/j.jallcom.2021.159588

DO - 10.1016/j.jallcom.2021.159588

M3 - Article

AN - SCOPUS:85103779215

VL - 872

JO - Journal of Alloys and Compounds

JF - Journal of Alloys and Compounds

SN - 0925-8388

M1 - 159588

ER -