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The Influence of Laser Defocusing in Selective Laser Melted IN 625

Laser defocusing was investigated to assess the influence on the surface quality, melt pool shape, tensile properties, and densification of selective laser melted (SLMed) IN 625. Negative (−0.5 mm, −0.3 mm), positive (+0.3 mm, +0.5 mm), and 0 mm defocusing distances were used to produce specimens, w...

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Autores principales: Paraschiv, Alexandru, Matache, Gheorghe, Condruz, Mihaela Raluca, Frigioescu, Tiberius Florian, Ionică, Ion
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8269469/
https://www.ncbi.nlm.nih.gov/pubmed/34206225
http://dx.doi.org/10.3390/ma14133447
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author Paraschiv, Alexandru
Matache, Gheorghe
Condruz, Mihaela Raluca
Frigioescu, Tiberius Florian
Ionică, Ion
author_facet Paraschiv, Alexandru
Matache, Gheorghe
Condruz, Mihaela Raluca
Frigioescu, Tiberius Florian
Ionică, Ion
author_sort Paraschiv, Alexandru
collection PubMed
description Laser defocusing was investigated to assess the influence on the surface quality, melt pool shape, tensile properties, and densification of selective laser melted (SLMed) IN 625. Negative (−0.5 mm, −0.3 mm), positive (+0.3 mm, +0.5 mm), and 0 mm defocusing distances were used to produce specimens, while the other process parameters remained unchanged. The scanning electron microscopy (SEM) images of the melt pools generated by different defocusing amounts were used to assess the influence on the morphology and melt pool size. The mechanical properties were evaluated by tensile testing, and the bulk density of the parts was measured by Archimedes’ method. It was observed that the melt pool morphology and melting mode are directly related to the defocusing distances. The melting height increases while the melting depth decreases from positive to negative defocusing. The use of negative defocusing distances generates the conduction melting mode of the SLMed IN 625, and the alloy (as-built) has the maximum density and ultimate tensile strength. Conversely, the use of positive distances generates keyhole mode melting accompanied by a decrease of density and mechanical strength due to the increase in porosity and is therefore not suitable for the SLM process.
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spelling pubmed-82694692021-07-10 The Influence of Laser Defocusing in Selective Laser Melted IN 625 Paraschiv, Alexandru Matache, Gheorghe Condruz, Mihaela Raluca Frigioescu, Tiberius Florian Ionică, Ion Materials (Basel) Article Laser defocusing was investigated to assess the influence on the surface quality, melt pool shape, tensile properties, and densification of selective laser melted (SLMed) IN 625. Negative (−0.5 mm, −0.3 mm), positive (+0.3 mm, +0.5 mm), and 0 mm defocusing distances were used to produce specimens, while the other process parameters remained unchanged. The scanning electron microscopy (SEM) images of the melt pools generated by different defocusing amounts were used to assess the influence on the morphology and melt pool size. The mechanical properties were evaluated by tensile testing, and the bulk density of the parts was measured by Archimedes’ method. It was observed that the melt pool morphology and melting mode are directly related to the defocusing distances. The melting height increases while the melting depth decreases from positive to negative defocusing. The use of negative defocusing distances generates the conduction melting mode of the SLMed IN 625, and the alloy (as-built) has the maximum density and ultimate tensile strength. Conversely, the use of positive distances generates keyhole mode melting accompanied by a decrease of density and mechanical strength due to the increase in porosity and is therefore not suitable for the SLM process. MDPI 2021-06-22 /pmc/articles/PMC8269469/ /pubmed/34206225 http://dx.doi.org/10.3390/ma14133447 Text en © 2021 by the authors. https://creativecommons.org/licenses/by/4.0/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 (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Paraschiv, Alexandru
Matache, Gheorghe
Condruz, Mihaela Raluca
Frigioescu, Tiberius Florian
Ionică, Ion
The Influence of Laser Defocusing in Selective Laser Melted IN 625
title The Influence of Laser Defocusing in Selective Laser Melted IN 625
title_full The Influence of Laser Defocusing in Selective Laser Melted IN 625
title_fullStr The Influence of Laser Defocusing in Selective Laser Melted IN 625
title_full_unstemmed The Influence of Laser Defocusing in Selective Laser Melted IN 625
title_short The Influence of Laser Defocusing in Selective Laser Melted IN 625
title_sort influence of laser defocusing in selective laser melted in 625
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8269469/
https://www.ncbi.nlm.nih.gov/pubmed/34206225
http://dx.doi.org/10.3390/ma14133447
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