Effect of oxygen diffusion hardening on fatigue resistance in Ti-6Al-4V alloys

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dc.contributor.advisorKnutsen, Robert Den_ZA
dc.contributor.authorChihoro, Lester Tinasheen_ZA
dc.date.accessioned2015-01-10T06:45:57Z
dc.date.available2015-01-10T06:45:57Z
dc.date.issued2009en_ZA
dc.descriptionIncludes abstract.en_ZA
dc.descriptionIncludes bibliographical references (leaves 106-110).en_ZA
dc.description.abstractThe increased usage of titanium and its alloys in the aerospace industry and for biomedical applications has been attributed to its good strength to weight ratio, exceptional corrosion resistance and high melting point. In this research the titanium alloy that was focused on is the Ti-6Al-4V (by weight) alloy. With these good properties the alloys are also susceptible to poor tribological property behaviour. Surface engineering processes help improve these poor properties and one such process is known as Oxygen Boost Diffusion Hardening (OBDH). The OBDH process is a two-step process. The first step involves oxidation of the samples in air at elevated temperatures and the second step is carried out in order to diffusion treat the pre-oxidised specimens in a vacuum or argon environment. This was done using different oxygen and diffusion step temperatures and times. A comparison of the different fatigue lives after the treatments was made using the untreated specimen as the yardstick. The specimens were heat treated, in an oxidation furnace for the first stage and a controlled atmosphere furnace for the second stage. Thereafter, a rotational bending machine was used for the fatigue testing where fatigue failure data was obtained. For assistance in fully analysing the fatigue data; hardness tests, microstructural analysis and fracture morphology were undertaken and quantified.en_ZA
dc.identifier.apacitationChihoro, L. T. (2009). <i>Effect of oxygen diffusion hardening on fatigue resistance in Ti-6Al-4V alloys</i>. (Thesis). University of Cape Town ,Faculty of Engineering & the Built Environment ,Department of Mechanical Engineering. Retrieved from http://hdl.handle.net/11427/11886en_ZA
dc.identifier.chicagocitationChihoro, Lester Tinashe. <i>"Effect of oxygen diffusion hardening on fatigue resistance in Ti-6Al-4V alloys."</i> Thesis., University of Cape Town ,Faculty of Engineering & the Built Environment ,Department of Mechanical Engineering, 2009. http://hdl.handle.net/11427/11886en_ZA
dc.identifier.citationChihoro, L. 2009. Effect of oxygen diffusion hardening on fatigue resistance in Ti-6Al-4V alloys. University of Cape Town.en_ZA
dc.identifier.ris TY - Thesis / Dissertation AU - Chihoro, Lester Tinashe AB - The increased usage of titanium and its alloys in the aerospace industry and for biomedical applications has been attributed to its good strength to weight ratio, exceptional corrosion resistance and high melting point. In this research the titanium alloy that was focused on is the Ti-6Al-4V (by weight) alloy. With these good properties the alloys are also susceptible to poor tribological property behaviour. Surface engineering processes help improve these poor properties and one such process is known as Oxygen Boost Diffusion Hardening (OBDH). The OBDH process is a two-step process. The first step involves oxidation of the samples in air at elevated temperatures and the second step is carried out in order to diffusion treat the pre-oxidised specimens in a vacuum or argon environment. This was done using different oxygen and diffusion step temperatures and times. A comparison of the different fatigue lives after the treatments was made using the untreated specimen as the yardstick. The specimens were heat treated, in an oxidation furnace for the first stage and a controlled atmosphere furnace for the second stage. Thereafter, a rotational bending machine was used for the fatigue testing where fatigue failure data was obtained. For assistance in fully analysing the fatigue data; hardness tests, microstructural analysis and fracture morphology were undertaken and quantified. DA - 2009 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 2009 T1 - Effect of oxygen diffusion hardening on fatigue resistance in Ti-6Al-4V alloys TI - Effect of oxygen diffusion hardening on fatigue resistance in Ti-6Al-4V alloys UR - http://hdl.handle.net/11427/11886 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/11886
dc.identifier.vancouvercitationChihoro LT. Effect of oxygen diffusion hardening on fatigue resistance in Ti-6Al-4V alloys. [Thesis]. University of Cape Town ,Faculty of Engineering & the Built Environment ,Department of Mechanical Engineering, 2009 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/11886en_ZA
dc.language.isoengen_ZA
dc.publisher.departmentDepartment of Mechanical Engineeringen_ZA
dc.publisher.facultyFaculty of Engineering and the Built Environment
dc.publisher.institutionUniversity of Cape Town
dc.subject.otherMechanical Engineeringen_ZA
dc.titleEffect of oxygen diffusion hardening on fatigue resistance in Ti-6Al-4V alloysen_ZA
dc.typeMaster Thesis
dc.type.qualificationlevelMasters
dc.type.qualificationnameMScen_ZA
uct.type.filetypeText
uct.type.filetypeImage
uct.type.publicationResearchen_ZA
uct.type.resourceThesisen_ZA
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