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

 

Show simple item record

dc.contributor.advisor Knutsen, Robert D en_ZA
dc.contributor.author Chihoro, Lester Tinashe en_ZA
dc.date.accessioned 2015-01-10T06:45:57Z
dc.date.available 2015-01-10T06:45:57Z
dc.date.issued 2009 en_ZA
dc.identifier.citation Chihoro, L. 2009. Effect of oxygen diffusion hardening on fatigue resistance in Ti-6Al-4V alloys. University of Cape Town. en_ZA
dc.identifier.uri http://hdl.handle.net/11427/11886
dc.description Includes abstract. en_ZA
dc.description Includes bibliographical references (leaves 106-110). en_ZA
dc.description.abstract 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. en_ZA
dc.language.iso eng en_ZA
dc.subject.other Mechanical Engineering en_ZA
dc.title Effect of oxygen diffusion hardening on fatigue resistance in Ti-6Al-4V alloys en_ZA
dc.type Master Thesis
uct.type.publication Research en_ZA
uct.type.resource Thesis en_ZA
dc.publisher.institution University of Cape Town
dc.publisher.faculty Faculty of Engineering and the Built Environment
dc.publisher.department Department of Mechanical Engineering en_ZA
dc.type.qualificationlevel Masters
dc.type.qualificationname MSc en_ZA
uct.type.filetype Text
uct.type.filetype Image
dc.identifier.apacitation Chihoro, 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/11427/11886 en_ZA
dc.identifier.chicagocitation Chihoro, 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/11427/11886 en_ZA
dc.identifier.vancouvercitation Chihoro 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/11427/11886 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


Files in this item

This item appears in the following Collection(s)

Show simple item record