The role of microstructure and local crystallographic orientation near porosity defects on the high cycle fatigue life of an additive manufactured Ti-6Al-4V

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dc.contributor.authorShamir, Muhammad
dc.contributor.authorSyed, Abdul Khadar
dc.contributor.authorJanik, Vit
dc.contributor.authorBiswal, Romali
dc.contributor.authorZhang, Xiang
dc.date.accessioned2021-02-18T15:31:27Z
dc.date.available2021-02-18T15:31:27Z
dc.date.issued2020-08-21
dc.description.abstractTitanium alloys such as Ti-6Al-4V built by most of the additive manufacturing processes are known to contain process induced defects, non-conventional microstructure and strong crystallographic texture; all of which can affect the fatigue strength. In this study we evaluated the effect of crystallographic orientation of α and α lath width around gas pore defects on the high cycle fatigue life of Wire + Arc Additive Manufactured Ti-6Al-4V by means of Electron Back Scattered Diffraction. Here we show that variations in crystallographic orientation of α lath and its width in the vicinity of the crack initiating defect were the main reasons for the considerable scatter in fatigue life. Pyramidal slip systems with high Schmid factor active around the defects resulted in longer fatigue life compared to pyramidal slip with lower Schmid factor. In the absence of pyramidal slip, cracks initiated from active prismatic slip systems. When considering the influence of the microstructure, a higher number of smaller α laths around the defect resulted in longer fatigue life, and vice versa. Overall, the fatigue crack initiation stage was controlled collectively by the complex interaction of porosity characteristics, α lath width and its crystallographic orientation at the crack initiation locationen_UK
dc.identifier.citationMuhammad S, Syed AK, Janik V, Biswal R, Zhang X. (2020) The role of microstructure and local crystallographic orientation near porosity defects on the high cycle fatigue life of an additive manufactured Ti-6Al-4V. Materials Characterization, Volume 169, November 2020, Article number 110576en_UK
dc.identifier.issn1044-5803
dc.identifier.urihttps://doi.org/10.1016/j.matchar.2020.110576
dc.identifier.urihttps://dspace.lib.cranfield.ac.uk/handle/1826/16375
dc.language.isoenen_UK
dc.publisherElsevieren_UK
dc.rightsAttribution 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/*
dc.subjectTitanium alloyen_UK
dc.subjectSchmid factoren_UK
dc.subjectPorosityen_UK
dc.subjectCrack initiation,en_UK
dc.subjectAdditive manufacturingen_UK
dc.titleThe role of microstructure and local crystallographic orientation near porosity defects on the high cycle fatigue life of an additive manufactured Ti-6Al-4Ven_UK
dc.typeArticleen_UK

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