Laser Metal Deposition of Inconel 718 Alloy and As-built Mechanical Properties Compared to Casting
1
Automation Robotics and Machines Laboratory, University of Applied Sciences of Southern Switzerland, 6962 Viganello, Switzerland
2
DynaMat SUPSI Laboratory, University of Applied Sciences of Southern Switzerland, 6850 Mendrisio, Switzerland
*
Author to whom correspondence should be addressed.
Materials 2021, 14(2), 437; https://doi.org/10.3390/ma14020437
Received: 10 November 2020 / Revised: 7 January 2021 / Accepted: 12 January 2021 / Published: 17 January 2021
(This article belongs to the Special Issue Metal Additive Manufacturing Application: Technological Advances, Metal Design and Process Optimization)
In the last years, powder-based Laser Metal Deposition (LMD) has been attracting attention as a disruptive Additive Manufacturing (AM) technique for both the fabrication and restoration of Inconel 718 components, enabling to overcome current limitations faced by conventional manufacturing processes in terms of manufacturing costs, tool wear, and lead time. Nevertheless, the uncertainty related to the final mechanical performance of the as-built LMD parts limits a wider adoption of such technology at industrial level. This research work focuses on the mechanical characterization of as-built Inconel 718 specimens through split Hopkinson tensile bar tests performed at different strain rate conditions. The influence of laser power on the final mechanical behavior of the as-built tensile samples is discussed and compared with the mechanical response of as-cast ones. The as-built specimens exhibit a high internal density (i.e., 99.92% and 99.90% for 300 W and 400 W, respectively) and a more ductile behavior compared to the as-cast ones for every evaluated strain rate condition. The strain hardening capacity of the as-built samples increases with the laser power involved in the LMD process, reaching an average Yield Strength of 703 MPa for specimens realized at 400 W and tested at 800/s.
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Keywords:
Laser Metal Deposition; Inconel 718; as-built; mechanical behavior; repairing; high strain rate
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MDPI and ACS Style
Mazzucato, F.; Forni, D.; Valente, A.; Cadoni, E. Laser Metal Deposition of Inconel 718 Alloy and As-built Mechanical Properties Compared to Casting. Materials 2021, 14, 437.
AMA Style
Mazzucato F, Forni D, Valente A, Cadoni E. Laser Metal Deposition of Inconel 718 Alloy and As-built Mechanical Properties Compared to Casting. Materials. 2021; 14(2):437.
Chicago/Turabian StyleMazzucato, Federico; Forni, Daniele; Valente, Anna; Cadoni, Ezio. 2021. "Laser Metal Deposition of Inconel 718 Alloy and As-built Mechanical Properties Compared to Casting" Materials 14, no. 2: 437.
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