Laser Metal Deposition of Inconel 718 Alloy and As-built Mechanical Properties Compared to Casting

Mazzucato, Federico and Forni, Daniele and Valente, Anna and Cadoni, Ezio (2021) Laser Metal Deposition of Inconel 718 Alloy and As-built Mechanical Properties Compared to Casting. Materials, 14 (2). p. 437.

Text 14/2/437 - Published Version Download (326kB)

Abstract

In the last years, powder-based Laser Metal Deposition (LMD) has been attracting attentionas a disruptive Additive Manufacturing (AM) technique for both the fabrication and restoration ofInconel 718 components, enabling to overcome current limitations faced by conventional manufacturingprocesses in terms of manufacturing costs, tool wear, and lead time. Nevertheless, the uncertaintyrelated to the final mechanical performance of the as-built LMD parts limits a wider adoption ofsuch technology at industrial level. This research work focuses on the mechanical characterizationof as-built Inconel 718 specimens through split Hopkinson tensile bar tests performed at differentstrain rate conditions. The influence of laser power on the final mechanical behavior of the as-builttensile samples is discussed and compared with the mechanical response of as-cast ones. The as-builtspecimens 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 theLMD process, reaching an average Yield Strength of 703 MPa for specimens realized at 400Wandtested at 800/s.

Item Type:	Scientific journal article, Newspaper article or Magazine article
Subjects:	Engineering Engineering > Mechanical engineering Engineering > Mechanical engineering > Dynamics Engineering > Aerospace engineering
Department/unit:	Dipartimento ambiente costruzioni e design > Laboratorio SUPSI DYNAMAT Dipartimento tecnologie innovative > Istituto sistemi e tecnologie per la produzione sostenibile
Depositing User:	Ezio Cadoni
Date Deposited:	19 Jan 2021 10:10
Last Modified:	24 Aug 2023 14:00
URI:	http://repository.supsi.ch/id/eprint/12281

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