In-situ XRD Study on the Effects of Stress Relaxation and Phase Transformation Heat Treatments on Mechanical and Microstructural Behaviour of Additively Manufactured Ti-6Al-4V

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dc.contributor.authorRossi Kaschel, Frederico-
dc.contributor.authorVijayaraghavan, R. K.-
dc.contributor.authorMcNally, Patrick J.-
dc.contributor.authorDowling, Denis P.-
dc.contributor.authorCelikin, Mert- Elsevieren_US
dc.identifier.citationMaterials Science and Engineering Aen_US
dc.description.abstractAdditively Manufactured (AM) titanium (Ti) components are routinely post-thermal heat treated (HT), to reduce internal stresses, as well as to obtain more desirable microstructural features, yielding improved mechanical performance. Currently, there is no consensus on the optimum HT method for AM Ti-6Al-4V, as the mechanism for the main phase transformation (α′ (martensite) → α + β (equilibrium)) is still ambiguous. In this study, stress relaxation and phase transformation in the alloy are investigated in detail, via isothermal heat treatments and in situ high temperature X-ray Diffraction (XRD). The latter was carried out at heating rates of 5 and 200 °C/min. The relationship between crystallographic evolution during isothermal treatments and mechanical behaviour was determined. Isothermal holding at 400 °C resulted in an increase in ultimate tensile strength (UTS) and yield strength (YS) by 3.4% and 2.1%, respectively, due to the relief of tensile microstrain. It was found that isothermal treatment conducted between 550 and 700 °C promotes martensitic decomposition, resulting in the formation of a transitional - αtr phase, which has an asymmetrical hexagonal crystal lattice. The formation of this αtr phase was determined to be the main factor contributing to a major decrease in ductility.en_US
dc.description.sponsorshipScience Foundation Irelanden_US
dc.rightsThis is the author’s version of a work that was accepted for publication in Materials Science and Engineering A. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Materials Science and Engineering A (819, Article Number: 141534 (2021))
dc.subjectAdditive manufacturingen_US
dc.subjectHigh temperature X-ray diffractionen_US
dc.subjectPhase transformationen_US
dc.subjectStress relaxationen_US
dc.titleIn-situ XRD Study on the Effects of Stress Relaxation and Phase Transformation Heat Treatments on Mechanical and Microstructural Behaviour of Additively Manufactured Ti-6Al-4Ven_US
dc.typeJournal Articleen_US
dc.statusPeer revieweden_US
dc.citation.otherArticle Number: 141534en_US
dc.neeo.contributorRossi Kaschel|Frederico|aut|-
dc.neeo.contributorVijayaraghavan|R. K.|aut|-
dc.neeo.contributorMcNally|Patrick J.|aut|-
dc.neeo.contributorDowling|Denis P.|aut|-
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