The Influence of Porosity on Fatigue Crack Initiation in Additively Manufactured Titanium Components

Abstract Without post-manufacture HIPing the fatigue life of electron beam melting (EBM) additively manufactured parts is currently dominated by the presence of porosity, exhibiting large amounts of scatter. Here we have shown that the size and location of these defects is crucial in determining the...

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Autores principales:	S. Tammas-Williams, P. J. Withers, I. Todd, P. B. Prangnell
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/a34671fedf574a5b9334a973732871e5
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spelling	oai:doaj.org-article:a34671fedf574a5b9334a973732871e52021-12-02T16:06:55ZThe Influence of Porosity on Fatigue Crack Initiation in Additively Manufactured Titanium Components10.1038/s41598-017-06504-52045-2322https://doaj.org/article/a34671fedf574a5b9334a973732871e52017-08-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-06504-5https://doaj.org/toc/2045-2322Abstract Without post-manufacture HIPing the fatigue life of electron beam melting (EBM) additively manufactured parts is currently dominated by the presence of porosity, exhibiting large amounts of scatter. Here we have shown that the size and location of these defects is crucial in determining the fatigue life of EBM Ti-6Al-4V samples. X-ray computed tomography has been used to characterise all the pores in fatigue samples prior to testing and to follow the initiation and growth of fatigue cracks. This shows that the initiation stage comprises a large fraction of life (>70%). In these samples the initiating defect was often some way from being the largest (merely within the top 35% of large defects). Using various ranking strategies including a range of parameters, we found that when the proximity to the surface and the pore aspect ratio were included the actual initiating defect was within the top 3% of defects ranked most harmful. This lays the basis for considering how the deposition parameters can be optimised to ensure that the distribution of pores is tailored to the distribution of applied stresses in additively manufactured parts to maximise the fatigue life for a given loading cycle.S. Tammas-WilliamsP. J. WithersI. ToddP. B. PrangnellNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-13 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q S. Tammas-Williams P. J. Withers I. Todd P. B. Prangnell The Influence of Porosity on Fatigue Crack Initiation in Additively Manufactured Titanium Components
description	Abstract Without post-manufacture HIPing the fatigue life of electron beam melting (EBM) additively manufactured parts is currently dominated by the presence of porosity, exhibiting large amounts of scatter. Here we have shown that the size and location of these defects is crucial in determining the fatigue life of EBM Ti-6Al-4V samples. X-ray computed tomography has been used to characterise all the pores in fatigue samples prior to testing and to follow the initiation and growth of fatigue cracks. This shows that the initiation stage comprises a large fraction of life (>70%). In these samples the initiating defect was often some way from being the largest (merely within the top 35% of large defects). Using various ranking strategies including a range of parameters, we found that when the proximity to the surface and the pore aspect ratio were included the actual initiating defect was within the top 3% of defects ranked most harmful. This lays the basis for considering how the deposition parameters can be optimised to ensure that the distribution of pores is tailored to the distribution of applied stresses in additively manufactured parts to maximise the fatigue life for a given loading cycle.
format	article
author	S. Tammas-Williams P. J. Withers I. Todd P. B. Prangnell
author_facet	S. Tammas-Williams P. J. Withers I. Todd P. B. Prangnell
author_sort	S. Tammas-Williams
title	The Influence of Porosity on Fatigue Crack Initiation in Additively Manufactured Titanium Components
title_short	The Influence of Porosity on Fatigue Crack Initiation in Additively Manufactured Titanium Components
title_full	The Influence of Porosity on Fatigue Crack Initiation in Additively Manufactured Titanium Components
title_fullStr	The Influence of Porosity on Fatigue Crack Initiation in Additively Manufactured Titanium Components
title_full_unstemmed	The Influence of Porosity on Fatigue Crack Initiation in Additively Manufactured Titanium Components
title_sort	influence of porosity on fatigue crack initiation in additively manufactured titanium components
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/a34671fedf574a5b9334a973732871e5
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The Influence of Porosity on Fatigue Crack Initiation in Additively Manufactured Titanium Components

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