Cargando…

Wire-Based Additive Manufacturing of Ti-6Al-4V Using Electron Beam Technique

Electron beam freeform fabrication is a wire feed direct energy deposition additive manufacturing process, where the vacuum condition ensures excellent shielding against the atmosphere and enables processing of highly reactive materials. In this work, this technique is applied for the α + β-titanium...

Descripción completa

Detalles Bibliográficos
Autores principales: Pixner, Florian, Warchomicka, Fernando, Peter, Patrick, Steuwer, Axel, Colliander, Magnus Hörnqvist, Pederson, Robert, Enzinger, Norbert
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7435555/
https://www.ncbi.nlm.nih.gov/pubmed/32722303
http://dx.doi.org/10.3390/ma13153310
_version_ 1783572353818558464
author Pixner, Florian
Warchomicka, Fernando
Peter, Patrick
Steuwer, Axel
Colliander, Magnus Hörnqvist
Pederson, Robert
Enzinger, Norbert
author_facet Pixner, Florian
Warchomicka, Fernando
Peter, Patrick
Steuwer, Axel
Colliander, Magnus Hörnqvist
Pederson, Robert
Enzinger, Norbert
author_sort Pixner, Florian
collection PubMed
description Electron beam freeform fabrication is a wire feed direct energy deposition additive manufacturing process, where the vacuum condition ensures excellent shielding against the atmosphere and enables processing of highly reactive materials. In this work, this technique is applied for the α + β-titanium alloy Ti-6Al-4V to determine suitable process parameter for robust building. The correlation between dimensions and the dilution of single beads based on selected process parameters, leads to an overlapping distance in the range of 70–75% of the bead width, resulting in a multi-bead layer with a uniform height and with a linear build-up rate. Moreover, the stacking of layers with different numbers of tracks using an alternating symmetric welding sequence allows the manufacturing of simple structures like walls and blocks. Microscopy investigations reveal that the primary structure consists of epitaxial grown columnar prior β-grains, with some randomly scattered macro and micropores. The developed microstructure consists of a mixture of martensitic and finer α-lamellar structure with a moderate and uniform hardness of 334 HV, an ultimate tensile strength of 953 MPa and rather low fracture elongation of 4.5%. A subsequent stress relief heat treatment leads to a uniform hardness distribution and an extended fracture elongation of 9.5%, with a decrease of the ultimate strength to 881 MPa due to the fine α-lamellar structure produced during the heat treatment. Residual stresses measured by energy dispersive X-ray diffraction shows after deposition 200–450 MPa in tension in the longitudinal direction, while the stresses reach almost zero when the stress relief treatment is carried out.
format Online
Article
Text
id pubmed-7435555
institution National Center for Biotechnology Information
language English
publishDate 2020
publisher MDPI
record_format MEDLINE/PubMed
spelling pubmed-74355552020-08-28 Wire-Based Additive Manufacturing of Ti-6Al-4V Using Electron Beam Technique Pixner, Florian Warchomicka, Fernando Peter, Patrick Steuwer, Axel Colliander, Magnus Hörnqvist Pederson, Robert Enzinger, Norbert Materials (Basel) Article Electron beam freeform fabrication is a wire feed direct energy deposition additive manufacturing process, where the vacuum condition ensures excellent shielding against the atmosphere and enables processing of highly reactive materials. In this work, this technique is applied for the α + β-titanium alloy Ti-6Al-4V to determine suitable process parameter for robust building. The correlation between dimensions and the dilution of single beads based on selected process parameters, leads to an overlapping distance in the range of 70–75% of the bead width, resulting in a multi-bead layer with a uniform height and with a linear build-up rate. Moreover, the stacking of layers with different numbers of tracks using an alternating symmetric welding sequence allows the manufacturing of simple structures like walls and blocks. Microscopy investigations reveal that the primary structure consists of epitaxial grown columnar prior β-grains, with some randomly scattered macro and micropores. The developed microstructure consists of a mixture of martensitic and finer α-lamellar structure with a moderate and uniform hardness of 334 HV, an ultimate tensile strength of 953 MPa and rather low fracture elongation of 4.5%. A subsequent stress relief heat treatment leads to a uniform hardness distribution and an extended fracture elongation of 9.5%, with a decrease of the ultimate strength to 881 MPa due to the fine α-lamellar structure produced during the heat treatment. Residual stresses measured by energy dispersive X-ray diffraction shows after deposition 200–450 MPa in tension in the longitudinal direction, while the stresses reach almost zero when the stress relief treatment is carried out. MDPI 2020-07-24 /pmc/articles/PMC7435555/ /pubmed/32722303 http://dx.doi.org/10.3390/ma13153310 Text en © 2020 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
Pixner, Florian
Warchomicka, Fernando
Peter, Patrick
Steuwer, Axel
Colliander, Magnus Hörnqvist
Pederson, Robert
Enzinger, Norbert
Wire-Based Additive Manufacturing of Ti-6Al-4V Using Electron Beam Technique
title Wire-Based Additive Manufacturing of Ti-6Al-4V Using Electron Beam Technique
title_full Wire-Based Additive Manufacturing of Ti-6Al-4V Using Electron Beam Technique
title_fullStr Wire-Based Additive Manufacturing of Ti-6Al-4V Using Electron Beam Technique
title_full_unstemmed Wire-Based Additive Manufacturing of Ti-6Al-4V Using Electron Beam Technique
title_short Wire-Based Additive Manufacturing of Ti-6Al-4V Using Electron Beam Technique
title_sort wire-based additive manufacturing of ti-6al-4v using electron beam technique
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7435555/
https://www.ncbi.nlm.nih.gov/pubmed/32722303
http://dx.doi.org/10.3390/ma13153310
work_keys_str_mv AT pixnerflorian wirebasedadditivemanufacturingofti6al4vusingelectronbeamtechnique
AT warchomickafernando wirebasedadditivemanufacturingofti6al4vusingelectronbeamtechnique
AT peterpatrick wirebasedadditivemanufacturingofti6al4vusingelectronbeamtechnique
AT steuweraxel wirebasedadditivemanufacturingofti6al4vusingelectronbeamtechnique
AT colliandermagnushornqvist wirebasedadditivemanufacturingofti6al4vusingelectronbeamtechnique
AT pedersonrobert wirebasedadditivemanufacturingofti6al4vusingelectronbeamtechnique
AT enzingernorbert wirebasedadditivemanufacturingofti6al4vusingelectronbeamtechnique