Near-beta titanium alloys produced using laser powder-bed fusion.

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dc.contributor.advisorBecker, Thorsten Hermann en_ZA
dc.contributor.advisorTer Haar, GMen_ZA
dc.contributor.authorRudolph, SMen_ZA
dc.contributor.otherStellenbosch University. Faculty of Engineering. Dept. of Mechanical and Mechatronic Engineering.en_ZA
dc.date.accessioned2023-03-02T10:18:13Zen_ZA
dc.date.accessioned2023-05-18T06:59:19Zen_ZA
dc.date.available2023-03-02T10:18:13Zen_ZA
dc.date.available2023-05-18T06:59:19Zen_ZA
dc.date.issued2023-03en_ZA
dc.descriptionThesis (MEng)--Stellenbosch University, 2023.en_ZA
dc.description.abstractENGLISH ABSTRACT: β titanium alloys are used extensively in the aerospace industry to fulfil a multitude of applications due to their favorable properties, including the exhibition of high strength, workability, corrosion resistance, interchangeable combinations of strength and toughness, and ability to be heat treated over a wide range. However, little to no literature is available on the printability and mechanical performance of β titanium alloys subjected to additive manufacturing (AM), which is largely used for rapid prototyping and the production of complex components. Therefore, in this research, the printability and consequent mechanical performance of two β titanium alloys, viz. Ti-5Al-5V-5Mo-3Cr (Ti-5-5-5-3) and Ti-15Mo-3Nb- 3Al-0.2Si (Beta 21S), are considered whereby laser powder bed fusion is the means of manufacture. The process parameters were optimized experimentally in which the region of experimentation was determined using simulation software. The density was evaluated using the Archimedes’ principle. Pores were analyzed using optical microscopy. Additionally, the resulting microstructures were studied using scanning electron microscopy to further characterize the two alloys. The hardness and tensile properties of the as-built samples were investigated. A strong correlation was found between those reported and that of literature. The results demonstrate performance competitive with traditionally manufactured products, but more complex builds require investigation to alleviate uncertainties regarding the performance thereof. Additionally, the processing windows developed correlate with literature and provide insight into the combinations of process parameters which yield dense parts. The research presented herein reports the methods used to characterize the printability and mechanical performance demonstrated by commercially available β titanium alloys, Ti-5-5-5-3 and Beta 21S, produced by laser powder bed fusion. en_ZA
dc.description.abstractAFRIKAANS OPSOMMING: β-titaanallooie word vir menigte toepassings in die lugvaartindustrie gebruik as gevolg van hul voordelige eienskappe, ondermeer hoë sterkte, werkbaarheid, korrosieweerstandigheid, verwisselbare kombinasies van sterkte en taaiheid, en die vermoë daarvan om oor 'n wye reeks hittes behandel te word. Daar is egter min literatuur beskikbaar oor die sogenaamde drukbaarheid en meganiese verrigting van β-titaanallooie wat onderworpe is aan additiewe vervaardiging (AV), wat grootliks gebruik word vir vinnige prototipering en die vervaardiging van komplekse komponente. In hierdie navorsing word die drukbaarheid en gevolglike meganiese verrigting van twee β-titaanallooie, nl. Ti-5Al-5V-5Mo-3Cr (Ti-5-5-5-3) en Ti-15Mo-3Nb-3Al- 0.2Si (Beta 21S), oorweeg, met laserpoeierbedsamesmelting as die vervaardigingsmiddel. Die proses parameters is eksperimenteel geoptimaliseer, waar die gebied van eksperimentering met behulp van simulasie sagteware bepaal is. Die materiaaldigtheid is deur die Archimedes-beginsel bepaal. Porieë is met behulp van optiese mikroskopie (OM) geëvalueer en die resulterende mikrostrukture is met behulp van skandeerelektronmikroskopie (SEM) bestudeer om die twee allooie verder te karakteriseer. Die meganiese eienskappe van die monsters is ondersoek. Dié eienskappe sluit in hardheid en treksterkte. 'n Sterk korrelasie is gevind tussen die eienskappe wat gerapporteer is en dié van die literatuur. Die resultate toon meganiese werkverrigting aan wat mededingend is met tradisioneel-vervaardigde produkte, maar meer komplekse konstruksies vereis verdere ondersoek om enige onsekerhede oor die werkverrigting daarvan te verklaar. Die verwerkingsgebied wat ontwikkel is, stem ooreen met die literatuur en bied insig in die verskillende kombinasies van prosesparameters wat dig parte lewer. Hierdie navorsing rapporteer die metodes wat gebruik word om die rukbaarheid en meganiese werkverrigting te karakteriseer wat deur kommersieel-beskikbare β-titaanallooie, Ti-5-5-5-3 en Beta 21S, wat deur laserpoeierbedsamesmeltingvervaardig is, gedemonstreer word.af_ZA
dc.description.versionMastersen_ZA
dc.format.extent126 pages : illustrations.en_ZA
dc.identifier.urihttp://hdl.handle.net/10019.1/126995en_ZA
dc.language.isoen_ZAen_ZA
dc.language.isoen_ZAen_ZA
dc.publisherStellenbosch : Stellenbosch Universityen_ZA
dc.rights.holderStellenbosch Universityen_ZA
dc.subject.lcshAdditive manufacturing -- South Africa en_ZA
dc.subject.lcshTitanium alloys -- South Africa en_ZA
dc.subject.lcshLaser fusion -- South Africa en_ZA
dc.subject.lcshArchimedes' principle -- South Africaen_ZA
dc.subject.lcshAerospace industries -- South Africaen_ZA
dc.subject.lcshBiotechnology industries -- South Africaen_ZA
dc.titleNear-beta titanium alloys produced using laser powder-bed fusion.en_ZA
dc.typeThesisen_ZA
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