Linking In Situ Melt Pool Monitoring to Melt Pool Size Distributions and Internal Flaws in Laser Powder Bed Fusion

In situ monitoring of the melt pools in laser powder bed fusion (LPBF) has enabled the elucidation of process phenomena. There has been an increasing interest in also using melt pool monitoring to identify process anomalies and control the quality of the manufactured parts. However, a better underst...

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Autores principales:	Claudia Schwerz, Lars Nyborg
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	process monitoring melt pool variability defects flaws lack of fusion Mining engineering. Metallurgy TN1-997
Acceso en línea:	https://doaj.org/article/b1869ec17cf64d708771e72ac5158399
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spelling	oai:doaj.org-article:b1869ec17cf64d708771e72ac51583992021-11-25T18:22:27ZLinking In Situ Melt Pool Monitoring to Melt Pool Size Distributions and Internal Flaws in Laser Powder Bed Fusion10.3390/met111118562075-4701https://doaj.org/article/b1869ec17cf64d708771e72ac51583992021-11-01T00:00:00Zhttps://www.mdpi.com/2075-4701/11/11/1856https://doaj.org/toc/2075-4701In situ monitoring of the melt pools in laser powder bed fusion (LPBF) has enabled the elucidation of process phenomena. There has been an increasing interest in also using melt pool monitoring to identify process anomalies and control the quality of the manufactured parts. However, a better understanding of the variability of melt pools and the relation to the incidence of internal flaws are necessary to achieve this goal. This study aims to link distributions of melt pool dimensions to internal flaws and signal characteristics obtained from melt pool monitoring. A process mapping approach is employed in the manufacturing of Hastelloy X, comprising a vast portion of the process space. Ex situ measurements of melt pool dimensions and analysis of internal flaws are correlated to the signal obtained through in situ melt pool monitoring in the visible and near-infrared spectra. It is found that the variability in melt pool dimensions is related to the presence of internal flaws, but scatter in melt pool dimensions is not detectable by the monitoring system employed in this study. The signal intensities are proportional to melt pool dimensions, and the signal is increasingly dynamic following process conditions that increase the generation of spatter.Claudia SchwerzLars NyborgMDPI AGarticleprocess monitoringmelt poolvariabilitydefectsflawslack of fusionMining engineering. MetallurgyTN1-997ENMetals, Vol 11, Iss 1856, p 1856 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	process monitoring melt pool variability defects flaws lack of fusion Mining engineering. Metallurgy TN1-997
spellingShingle	process monitoring melt pool variability defects flaws lack of fusion Mining engineering. Metallurgy TN1-997 Claudia Schwerz Lars Nyborg Linking In Situ Melt Pool Monitoring to Melt Pool Size Distributions and Internal Flaws in Laser Powder Bed Fusion
description	In situ monitoring of the melt pools in laser powder bed fusion (LPBF) has enabled the elucidation of process phenomena. There has been an increasing interest in also using melt pool monitoring to identify process anomalies and control the quality of the manufactured parts. However, a better understanding of the variability of melt pools and the relation to the incidence of internal flaws are necessary to achieve this goal. This study aims to link distributions of melt pool dimensions to internal flaws and signal characteristics obtained from melt pool monitoring. A process mapping approach is employed in the manufacturing of Hastelloy X, comprising a vast portion of the process space. Ex situ measurements of melt pool dimensions and analysis of internal flaws are correlated to the signal obtained through in situ melt pool monitoring in the visible and near-infrared spectra. It is found that the variability in melt pool dimensions is related to the presence of internal flaws, but scatter in melt pool dimensions is not detectable by the monitoring system employed in this study. The signal intensities are proportional to melt pool dimensions, and the signal is increasingly dynamic following process conditions that increase the generation of spatter.
format	article
author	Claudia Schwerz Lars Nyborg
author_facet	Claudia Schwerz Lars Nyborg
author_sort	Claudia Schwerz
title	Linking In Situ Melt Pool Monitoring to Melt Pool Size Distributions and Internal Flaws in Laser Powder Bed Fusion
title_short	Linking In Situ Melt Pool Monitoring to Melt Pool Size Distributions and Internal Flaws in Laser Powder Bed Fusion
title_full	Linking In Situ Melt Pool Monitoring to Melt Pool Size Distributions and Internal Flaws in Laser Powder Bed Fusion
title_fullStr	Linking In Situ Melt Pool Monitoring to Melt Pool Size Distributions and Internal Flaws in Laser Powder Bed Fusion
title_full_unstemmed	Linking In Situ Melt Pool Monitoring to Melt Pool Size Distributions and Internal Flaws in Laser Powder Bed Fusion
title_sort	linking in situ melt pool monitoring to melt pool size distributions and internal flaws in laser powder bed fusion
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/b1869ec17cf64d708771e72ac5158399
work_keys_str_mv	AT claudiaschwerz linkinginsitumeltpoolmonitoringtomeltpoolsizedistributionsandinternalflawsinlaserpowderbedfusion AT larsnyborg linkinginsitumeltpoolmonitoringtomeltpoolsizedistributionsandinternalflawsinlaserpowderbedfusion
_version_	1718411280228810752

Linking In Situ Melt Pool Monitoring to Melt Pool Size Distributions and Internal Flaws in Laser Powder Bed Fusion

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