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Direct Laser Metal Deposition (DLMD) Additive Manufacturing (AM)of Inconel 718 Superalloy: Elemental, Microstructural and Physical Properties Evaluation

Moradi, Mahmoud, Pourmand, Zeynab, Hasani, Arman, Karami Moghadam, Mojtaba, Sakhaei, Amir Hosein, Shafiee, Mahmood, Lawrence, Jonathan (2021) Direct Laser Metal Deposition (DLMD) Additive Manufacturing (AM)of Inconel 718 Superalloy: Elemental, Microstructural and Physical Properties Evaluation. International Journal of Advanced Manufacturing Technology, . ISSN 0268-3768. E-ISSN 1433-3015. (In press) (doi:10.21203/ (Access to this publication is currently restricted. You may be able to access a copy if URLs are provided) (KAR id:88801)

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In this study direct laser metal deposition (DLMD) technique is adopted for the additive manufacturing (AM) of Inconel 718 Superalloy. To conduct the experiments, a 1 kW fiber laser with a coaxial nozzle head is used. The effects of scanning speed (for two values of 2.5 and 5 mm/s) as well as powder feed rate (for two values of 17.94 and 28.52 g/min) on the process were investigated. Characteristics of the 3D printed wall specimens such as the geometrical dimensions (width and height), microstructure observations, and the microhardness were obtained. In order to study the stability of the 3D manufactured walls, the height stability was considered for the investigation. Optical microscopy (OM), field emission electron microscopy (FE-SEM), energy dispersive X-ray spectroscopy (EDS), and mapping analysis were performed to derive the microstructural features of the additive manufactured samples. The Vickers microhardness test is used to evaluate the hardness distributions of additively manufactured parts. Catchment concept of the powder in DLMD process is used for explaining different trends of the process. Results indicated that, by decreasing the scanning speed, the width and height of the deposited layer increase. The average width of the additively manufactured samples directly depends on the scanning speed and the powder feed rate. Scanning speed has a reverse effect on the height stability; that is, the lower the scanning speed, the larger the stability. Microstructural results showed that because of the solidification process, the alloying elements will be accumulated in the grain boundaries. The non-uniform cooling rate and non-steady solidification rates of molten area in additive manufacturing process, the microhardness values of the additively manufactured samples following a fluctuated trend.

Item Type: Article
DOI/Identification number: 10.21203/
Uncontrolled keywords: Additive Manufacturing (AM); Direct Laser Metal Deposition (DLMD); Inconel 718 Superalloy; Dimensional Stability; Microstructure
Subjects: T Technology > TA Engineering (General). Civil engineering (General) > TA401 Materials engineering and construction
T Technology > TJ Mechanical engineering and machinery
Divisions: Divisions > Division of Computing, Engineering and Mathematical Sciences > School of Engineering and Digital Arts
Depositing User: A. Sakhaei
Date Deposited: 22 Jun 2021 15:12 UTC
Last Modified: 17 Aug 2021 09:18 UTC
Resource URI: (The current URI for this page, for reference purposes)
Sakhaei, Amir Hosein:
Shafiee, Mahmood:
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