Investigation of process by-products during the Selective Laser Melting of Ti6AL4V powder

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Title: Investigation of process by-products during the Selective Laser Melting of Ti6AL4V powder
Authors: Keaveney, ShaneShmeliov, AlekseyNicolosi, ValeriaDowling, Denis P.
Permanent link: http://hdl.handle.net/10197/12735
Date: Dec-2020
Online since: 2022-01-14T16:42:20Z
Abstract: This paper investigates the formation of process by-products during the laser processing of titanium alloy powders by Selective Laser Melting (SLM). The study was carried out during the printing of Ti6AL4V parts using a production scale SLM system (Renishaw RenAM500 M). By-product particles were obtained on the surface of powder removed from the area around where the pulsed laser powder treatments had been carried out. The process by-products examined in this study were damaged Ti6AL4V particles along with condensate. The particles were found to exhibit deshelling, fracture, and collision damage. Based on TEM and SEM examination, the condensate particles were found to have sizes in the nanoscale range and exhibited morphologies, similar to those reported in the literature for welding condensates. Energy-dispersive X-ray spectroscopy (EDX) analysis indicated that the condensate formed from processing Ti6AL4V, exhibited a higher level of aluminum than that obtained for the alloy itself, lower levels of titanium with minimal vanadium levels, were also obtained. This may indicate that the alloy partially decomposes, with the emission of the lower melting point alloying element. The use of an in-situ melt pool monitoring system (called Renishaw InfiniAM Spectral), was evaluated for detecting the presence of these by-product particulates, based on photodiode measurements of the melt pool emissions, along with a camera-based imaging of visual per layer conditions. A reduction in the intensity of infrared emissions was detected, in areas where suspected spatter particles had been redeposited. Thus, demonstrating that process monitoring can be used for the in-situ detection of particulate defects formed during printing.
Funding Details: Enterprise Ireland
European Commission - European Regional Development Fund
Science Foundation Ireland
Type of material: Journal Article
Publisher: Elsevier
Journal: Additive Manufacturing
Volume: 36
Copyright (published version): 2020 the Authors
Keywords: Pulsed laser SLMTi6Al4Melt pool emissionsProcess monitoringPowder bed fusion
DOI: 10.1016/j.addma.2020.101514
Language: en
Status of Item: Peer reviewed
This item is made available under a Creative Commons License: https://creativecommons.org/licenses/by/3.0/ie/
Appears in Collections:Mechanical & Materials Engineering Research Collection
I-Form Research Collection

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