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Structure and fatigue properties of selected titanium alloy
Prudíková, Alena ; Kohout, Jan (referee) ; Věchet, Stanislav (advisor)
Main topic of the thesis was to evaluate fatigue properties of the titanium alloy Ti-A13-V2,5, labelled by ASTM as Grade 9. Most attention was focused on fatigue behaviour of the alloy in the range of high cycle fatigue. Fatigue testing was realised to detect the fatigue properties and consequently to generate the Wöhler curve and the Haigh diagram. In addition to this, tension and bending tests were performed. Metallographic and fractographic analyses of fatigue fracture form part of the overview about material properties, which was accomplished by use of REM. Experimental part of the thesis was backed by the literature research. The first half of it contains a short summary of basic information about the titanium and its alloys, so as some chapters about the history and properties of titanium, the way of its production, classification of titanium alloys and its thermic treatment. The fatigue is thoroughly scrutinised in the second half of the background research. Here can also be found the information about the fatigue process, its stages, the fatigue life and the most significant attributes of the fatigue fracture. The last chapters of the thesis are dedicated to the alloy Ti-A13-V2,5 - being examined in the experimental part - so as to its fatigue properties. The main benefit of this thesis is the completion of the missing information concerning the fatigue behaviour of the alloy, which is – according to the literature research - generally not available.
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Grinding of titanium alloy Ti-6Al-4V ELI
Chalupa, Adam ; Dvořáková, Jana (referee) ; Píška, Miroslav (advisor)
This bachelor thesis is focused on titanium alloys. The first part covers the properties and practical uses of titanium alloys whilst the second part describes the issue of machining titanium alloys. In particular, the specific advantages and disadvantages of grinding titanium alloys. As part of the practical undertaking of this thesis, a titanium alloy Ti-6Al-4V ELI was ground, for which I measured the achieved surface quality and the forces occurring during grinding.
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Machining of hard-to-machine materials
Tejkl, Jakub ; Sliwková, Petra (referee) ; Píška, Miroslav (advisor)
This bachelor thesis studies the machining of hard-to-machine materials. The first part of the thesis considers hard-to-machine materials and analyses them. The next part of the study focuses on individual alloy machinability issues. The final section of the thesis is devoted to experiment, statistical analysis and subsequently to its evaluation.
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Grinding of titanium alloy Ti-6Al-4V ELI
Chalupa, Adam ; Dvořáková, Jana (referee) ; Píška, Miroslav (advisor)
This bachelor thesis is focused on titanium alloys. The first part covers the properties and practical uses of titanium alloys whilst the second part describes the issue of machining titanium alloys. In particular, the specific advantages and disadvantages of grinding titanium alloys. As part of the practical undertaking of this thesis, a titanium alloy Ti-6Al-4V ELI was ground, for which I measured the achieved surface quality and the forces occurring during grinding.
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ELECTRON BEAM WELDING OF HETEROGENEOUS WELDS OF Ti/Al ALLOYS
Havlík, Petr ; Dřímal, Daniel (referee) ; Schwarz,, Drahomír (referee) ; Foret, Rudolf (advisor)
The problematics of weldability of heterogeneous welds of aluminium and titanium alloys produced by electron beam welding is discussed in this work. Homogenous welds of selected alloys were analyzed in the first stage. Welding of these materials relates to formation of intermetallic phases at the interface of base materials due to differences in physical, chemical and metallurgical properties of base materials. One of the prerequisites for producing high quality weld joints is to find optimal process parameters. The influence of selected process parameters to integrity, structure and mechanical properties of heterogeneous Al/Ti joints is evaluated.
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CNC pocket milling of aeronautical alloys
Wiecková, Kateřina ; Sedlák, Josef (referee) ; Ohnišťová, Petra (advisor)
The aim of the work is to generate and verify pocket milling technology in aviation alloy 7475-T7351 with respect to machine time, surface and machining productivity. First part of the work is theoretical analysis of cycles of milling of simple and complex pockets. Next part of the work is focused on the desing and optimization of strategy of milling of simple and complex pockets in CAM programs and its experimental verification.
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Macro and microstructure of weld joints made of titanium alloy TiAl6V4 by electron beam
Prachař, Václav ; Havlík, Petr (referee) ; Foret, Rudolf (advisor)
The aim of this bachelor thesis is to evaluate macro and microstructures of weld joints made of titanium alloy Ti6Al4V by electron beam welding with different processing parameters of electron beam and evaluate the impact of this processing parameters to the structure of resultant weld joints. The theoretical part deals with titanium and its alloys, the titanium alloy Ti6Al4V and electron beam welding technology. In the experimental part, 11 weld joints are evaluated, their macro and microstructures and hardness profiles.
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Advanced Fabrication of Custom Orthopaedic Implants Using Selective Laser Melting Technology
Trubačová, Pavlína ; Sedlák, Josef (referee) ; Píška, Miroslav (advisor)
This work describes advanced fabrication of custom orthopaedic implants using unconventional additive manufacturing technology - Selective Laser Melting (SLM). There was a main focus on custom knee replacement and certainly on its femoral component. The study investigated three general issues within the domain of the usage of additive manufacturing technology in medical application. First, there was an evaluation of process parameters influences of SLM fabrication method on surface and mechanical properties of titanium Ti6Al4V ELI specimens. This material was used because of its biocompatibility and its wide use within implant fabrication. Then, a proposal of the manufacturing strategy was carried out and the fabrication of customized knee femoral component prototype by SLM technology was done. The elaboration of the numerical chain prior the SLM implant fabrication, from patient's CT knee scan to final femoral replacement model, was also done. Then, a proposal of different 3-axis and 5-axis strategies of machining of the fitting femoral surface of bone prototype (3D printed from the powder) using CNC machines FV 25 CNC and TAJMAC ZPS MCV 1210 was projected and also, the 3-axis spiral machining was realised. The individual machining tool paths were generated by software Power Mill from Delcam group. Finally, these machining strategies were generated as a prior step before a machining of real patient’s bone, therefore the machining tests of cartilage and bone were done.
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Influence of heat treatment on the microstructure of alloy TiAl6V4
Fišara, Šimon ; Němec, Karel (referee) ; Foret, Rudolf (advisor)
The main goal of this bachelor thesis is to summarize influence of heat treatment on microstructures and mechanical properties of titanium alloy Ti6Al4V. There are summarized basic facts about titanium and its alloys in the first section of theoretical part. The second section is focused on description of phase transformation, mechanical properties, microstructures and heat treatment of Ti6Al4V. There were made several types of heat treatment in the experimental part and after that there were made metallographic analysis and evaluation of microstructures.
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