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Influence of Scanning Strategies on Processing of Aluminum Alloy EN AW 2618 Using Selective Laser Melting

This paper deals with various selective laser melting (SLM) processing strategies for aluminum 2618 powder in order to get material densities and properties close to conventionally-produced, high-strength 2618 alloy. To evaluate the influence of laser scanning strategies on the resulting porosity an...

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Autores principales: Koutny, Daniel, Palousek, David, Pantelejev, Libor, Hoeller, Christian, Pichler, Rudolf, Tesicky, Lukas, Kaiser, Jozef
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2018
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5848995/
https://www.ncbi.nlm.nih.gov/pubmed/29443912
http://dx.doi.org/10.3390/ma11020298
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author Koutny, Daniel
Palousek, David
Pantelejev, Libor
Hoeller, Christian
Pichler, Rudolf
Tesicky, Lukas
Kaiser, Jozef
author_facet Koutny, Daniel
Palousek, David
Pantelejev, Libor
Hoeller, Christian
Pichler, Rudolf
Tesicky, Lukas
Kaiser, Jozef
author_sort Koutny, Daniel
collection PubMed
description This paper deals with various selective laser melting (SLM) processing strategies for aluminum 2618 powder in order to get material densities and properties close to conventionally-produced, high-strength 2618 alloy. To evaluate the influence of laser scanning strategies on the resulting porosity and mechanical properties a row of experiments was done. Three types of samples were used: single-track welds, bulk samples and samples for tensile testing. Single-track welds were used to find the appropriate processing parameters for achieving continuous and well-shaped welds. The bulk samples were built with different scanning strategies with the aim of reaching a low relative porosity of the material. The combination of the chessboard strategy with a 2 × 2 mm field size fabricated with an out-in spiral order was found to eliminate a major lack of fusion defects. However, small cracks in the material structure were found over the complete range of tested parameters. The decisive criteria was the elimination of small cracks that drastically reduced mechanical properties. Reduction of the thermal gradient using support structures or fabrication under elevated temperatures shows a promising approach to eliminating the cracks. Mechanical properties of samples produced by SLM were compared with the properties of extruded material. The results showed that the SLM-processed 2618 alloy could only reach one half of the yield strength and tensile strength of extruded material. This is mainly due to the occurrence of small cracks in the structure of the built material.
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spelling pubmed-58489952018-03-14 Influence of Scanning Strategies on Processing of Aluminum Alloy EN AW 2618 Using Selective Laser Melting Koutny, Daniel Palousek, David Pantelejev, Libor Hoeller, Christian Pichler, Rudolf Tesicky, Lukas Kaiser, Jozef Materials (Basel) Article This paper deals with various selective laser melting (SLM) processing strategies for aluminum 2618 powder in order to get material densities and properties close to conventionally-produced, high-strength 2618 alloy. To evaluate the influence of laser scanning strategies on the resulting porosity and mechanical properties a row of experiments was done. Three types of samples were used: single-track welds, bulk samples and samples for tensile testing. Single-track welds were used to find the appropriate processing parameters for achieving continuous and well-shaped welds. The bulk samples were built with different scanning strategies with the aim of reaching a low relative porosity of the material. The combination of the chessboard strategy with a 2 × 2 mm field size fabricated with an out-in spiral order was found to eliminate a major lack of fusion defects. However, small cracks in the material structure were found over the complete range of tested parameters. The decisive criteria was the elimination of small cracks that drastically reduced mechanical properties. Reduction of the thermal gradient using support structures or fabrication under elevated temperatures shows a promising approach to eliminating the cracks. Mechanical properties of samples produced by SLM were compared with the properties of extruded material. The results showed that the SLM-processed 2618 alloy could only reach one half of the yield strength and tensile strength of extruded material. This is mainly due to the occurrence of small cracks in the structure of the built material. MDPI 2018-02-14 /pmc/articles/PMC5848995/ /pubmed/29443912 http://dx.doi.org/10.3390/ma11020298 Text en © 2018 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Koutny, Daniel
Palousek, David
Pantelejev, Libor
Hoeller, Christian
Pichler, Rudolf
Tesicky, Lukas
Kaiser, Jozef
Influence of Scanning Strategies on Processing of Aluminum Alloy EN AW 2618 Using Selective Laser Melting
title Influence of Scanning Strategies on Processing of Aluminum Alloy EN AW 2618 Using Selective Laser Melting
title_full Influence of Scanning Strategies on Processing of Aluminum Alloy EN AW 2618 Using Selective Laser Melting
title_fullStr Influence of Scanning Strategies on Processing of Aluminum Alloy EN AW 2618 Using Selective Laser Melting
title_full_unstemmed Influence of Scanning Strategies on Processing of Aluminum Alloy EN AW 2618 Using Selective Laser Melting
title_short Influence of Scanning Strategies on Processing of Aluminum Alloy EN AW 2618 Using Selective Laser Melting
title_sort influence of scanning strategies on processing of aluminum alloy en aw 2618 using selective laser melting
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5848995/
https://www.ncbi.nlm.nih.gov/pubmed/29443912
http://dx.doi.org/10.3390/ma11020298
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