Work

In-process spectroscopic detection of chromium loss during Directed Energy Deposition of alloy 718

Year: 2019

Type: article

Abstract: In this work, a fast optical spectrometer was used to monitor the Directed Energy Deposition (DED) process, during the deposition of Alloy 718 samples with different laser power, thus different energy inputs into the material. Spectroscopic measurements revealed the presence of excited Cr I atoms in the plasma plume. The presence was more apparent for the samples characterized by higher energy input. The Cr depletion from these samples was confirmed by lower Cr content detected by Energy-Dispersive X-ray Spectroscopy (EDS) analysis. The samples were also characterized by higher oxidation and high-temperature corrosion rates in comparison to the samples produced with low energy input. These results prove the applicability of an optical emission spectroscopic system for monitoring DED to identify process conditions leading to compositional changes and variation in the quality of the built material.

Source: Materials & Design

DOI: 10.1016/j.matdes.2019.108317

Authors: Agnieszka Kisielewicz, Esmaeil Sadeghi, Fredrik Sikström, Anna-Karin Christiansson, Gianfranco Palumbo, Antonio Ancona

Institutions: University West, National Research Council, Polytechnic University of Bari

Language: English

Topic: Additive Manufacturing Materials and Processes

Subfield: Mechanical Engineering

Field: Engineering

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $2,244

Funders: Knowledge Foundation, Stiftelsen för Kunskaps- och Kompetensutveckling