Optimisation of the oxygen diffusion process for surface hardening of the Ti-6A1-4V alloy

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dc.contributor.advisorKnutsen, Robert Den_ZA
dc.contributor.authorMatthews, Liezl Anneen_ZA
dc.date.accessioned2014-07-31T11:20:53Z
dc.date.available2014-07-31T11:20:53Z
dc.date.issued2008en_ZA
dc.descriptionIncludes abstract.
dc.descriptionIncludes bibliographical references (leaves 87-89).
dc.description.abstractA well established method of surface hardening for titanium alloys is through solid solution strengthening by alloying with oxygen. This is achieved through a two step oxygen boost diffusion hardening (OBDH) process. During the oxidation step, the formation of a thick adherent rutile TiO2 layer occurs which is followed by subsequent boost diffusion (step 2) wherein the oxide layer is decomposed to free up oxygen for boost diffusion hardening. Step 1 is characteristically conducted at 850°C for 30 minutes in an oxygen rich environment followed by cooling. Step 2 is conducted in an oxygen free environment at 850°C for 20 hours. The approach of the present study was to refine the OBDH process and gain understanding of the mechanism responsible for boost diffusion hardening in order to optimise boost diffusion hardening. This was done by introducing and comparing the hardening results for a cyclic isothermal OBDH treatment and a continuous thermal OBDH treatment to the resultant hardening of the original two step process which included cooling after step 1.en_ZA
dc.identifier.apacitationMatthews, L. A. (2008). <i>Optimisation of the oxygen diffusion process for surface hardening of the Ti-6A1-4V alloy</i>. (Thesis). University of Cape Town ,Faculty of Engineering & the Built Environment ,Department of Mechanical Engineering. Retrieved from http://hdl.handle.net/11427/5509en_ZA
dc.identifier.chicagocitationMatthews, Liezl Anne. <i>"Optimisation of the oxygen diffusion process for surface hardening of the Ti-6A1-4V alloy."</i> Thesis., University of Cape Town ,Faculty of Engineering & the Built Environment ,Department of Mechanical Engineering, 2008. http://hdl.handle.net/11427/5509en_ZA
dc.identifier.citationMatthews, L. 2008. Optimisation of the oxygen diffusion process for surface hardening of the Ti-6A1-4V alloy. University of Cape Town.en_ZA
dc.identifier.ris TY - Thesis / Dissertation AU - Matthews, Liezl Anne AB - A well established method of surface hardening for titanium alloys is through solid solution strengthening by alloying with oxygen. This is achieved through a two step oxygen boost diffusion hardening (OBDH) process. During the oxidation step, the formation of a thick adherent rutile TiO2 layer occurs which is followed by subsequent boost diffusion (step 2) wherein the oxide layer is decomposed to free up oxygen for boost diffusion hardening. Step 1 is characteristically conducted at 850°C for 30 minutes in an oxygen rich environment followed by cooling. Step 2 is conducted in an oxygen free environment at 850°C for 20 hours. The approach of the present study was to refine the OBDH process and gain understanding of the mechanism responsible for boost diffusion hardening in order to optimise boost diffusion hardening. This was done by introducing and comparing the hardening results for a cyclic isothermal OBDH treatment and a continuous thermal OBDH treatment to the resultant hardening of the original two step process which included cooling after step 1. DA - 2008 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 2008 T1 - Optimisation of the oxygen diffusion process for surface hardening of the Ti-6A1-4V alloy TI - Optimisation of the oxygen diffusion process for surface hardening of the Ti-6A1-4V alloy UR - http://hdl.handle.net/11427/5509 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/5509
dc.identifier.vancouvercitationMatthews LA. Optimisation of the oxygen diffusion process for surface hardening of the Ti-6A1-4V alloy. [Thesis]. University of Cape Town ,Faculty of Engineering & the Built Environment ,Department of Mechanical Engineering, 2008 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/5509en_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.titleOptimisation of the oxygen diffusion process for surface hardening of the Ti-6A1-4V alloyen_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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