Vincenzo, Contaldi (2020) Effects of recycled powders on parts made by Selective Laser Melting Technology. [Tesi di dottorato]

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Item Type:	Tesi di dottorato
Resource language:	English
Title:	Effects of recycled powders on parts made by Selective Laser Melting Technology
Creators:	Creators Email Vincenzo, Contaldi contaldi.vincenzo@gmail.com
Date:	13 March 2020
Number of Pages:	98
Institution:	Università degli Studi di Napoli Federico II
Department:	Ingegneria Chimica, dei Materiali e della Produzione Industriale
Dottorato:	Ingegneria dei prodotti e dei processi industriali
Ciclo di dottorato:	32
Coordinatore del Corso di dottorato:	nome email Mensitieri, Giuseppe mensitie@unina.it
Tutor:	nome email Squillace, Antonino UNSPECIFIED
Date:	13 March 2020
Number of Pages:	98
Keywords:	additive manufacturing; powder recycling; selective laser melting;
Settori scientifico-disciplinari del MIUR:	Area 09 - Ingegneria industriale e dell'informazione > ING-IND/16 - Tecnologie e sistemi di lavorazione Area 09 - Ingegneria industriale e dell'informazione > ING-IND/21 - Metallurgia Area 09 - Ingegneria industriale e dell'informazione > ING-IND/22 - Scienza e tecnologia dei materiali
Date Deposited:	23 Mar 2020 00:06
Last Modified:	05 Nov 2021 14:13
URI:	http://www.fedoa.unina.it/id/eprint/13202

Collection description

Among the additive manufacturing (AM) techniques for metals available today, the laser powder bed fusion (L-PBF) is the one that guarantees the highest dimensional accuracy and precision, compared to laser metal deposition (LMD) methods that, however, offer higher productivity and the possibility of repair applications. A drawback of most of PBF processes, in the case of both laser and electron beam melting, is that the build volume has to be entirely filled up to the height of the tallest object to be produced, even in the case of a single object. Since not all the powder loaded into the build volume is melted to obtain the desired parts, it may be reclaimed for reuse. However, excess powder participates in the process so that its chemical-physical characteristics will inevitably evolve through reuse cycles. Due to the high cost of metal powders and the critical role of feedstock characteristics with respect to quality assurance of both part and process properties, it is important to investigate and maximize the number of times the powder can be reused for subsequent AM runs without causing an unacceptable decay of the mechanical properties of produced parts. Knowing that powders recycling is intensively under investigation, this Ph.D. thesis proposes an experimental investigation of two recycle strategies, chosen according to an academic and industrial point of view. In order to investigate and understand the mechanisms and the effects of recycling process, the experimental activities reported in this work refer to powders, tensile and fatigue samples manufactured using Selective Laser Melting technology and employing four of the most widespread and studied alloys: AlSi10Mg, Ti6Al4V, PH1 (15-5 PH) stainless steel and GP1 (17-4 PH) stainless steel.

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