Mechanical properties of Ti6Al4V parts produced by electron beam melting and topology optimization in different building directions

Download
index.pdf
2018
Temel Yiğitbaşı, Selen
Show full item record
474
views
192
downloads
Titanium and its alloys are used in various industries due to their mechanical properties such as high corrosion resistance, high strength and low-density. However, utilization of parts made of titanium are limited since the lead time for raw material is long, they are hard to machine, and the machining costs are high. On the other hand, it is possible to produce complex parts with powder material by additive manufacturing techniques, and there is a growing interest in research on these new technologies. Electron Beam Melting, one of the additive manufacturing methods, gives chance to designers to develop complex parts that have comparable mechanical properties to the parts produced by conventional methods. In the first part of this study, nine samples according to ASTM E8 standard were produced in different building directions (according to machine coordinate system X, Y and Z). To see surface imperfections effect on mechanical properties, one of the samples built in each direction were machined by lathe. After that, tensile test was performed, surface roughness was measured for each specimen and the fracture surfaces were examined. As a result, it was observed that the parts built in vertical direction have better tensile properties. In the second part of the thesis, to show that it is possible to produce light weight complex parts that satisfy the system function by additive manufacturing, topology optimization of an aircraft fitting was done with data from the experimental part. Two optimizations were performed for the parts to be manufactured in vertical and horizontal building directions. Location of the parts were determined according to the load cases and corresponding stress values. After optimization, newer designs with around 40% less weight were obtained without sacrificing the system performance requirement.
Titanium alloys., Titanium, Electron beam cutting., Manufacturing processes.
http://etd.lib.metu.edu.tr/upload/12622845/index.pdf
https://hdl.handle.net/11511/27842
Graduate School of Natural and Applied Sciences, Thesis

Suggestions

Alloy design for the development and production of titanium based bulk metallic glasses
Demir, Iraz Begüm; Akdeniz, M. Vedat.; Department of Metallurgical and Materials Engineering (2019)
The bulk metallic glasses (BMGs) are quite new type of metallic alloys exhibiting many superior features like high yield strength, improved elastic behavior, high corrosion resistance and superior abrasion resistance by virtue of its irregular atomic structures. Due to the importance of today’s reduced energy consumption, special attention is given to the light element-based bulk metallic glasses. Among these, Ti-based amorphous alloys have promising mechanical properties for use in engineering applications...
MECHANICAL PROPERTIES OF REPAIRED CARBON FIBER REINFORCED POLYMER COMPOSITES
Sonat, Emine Evren; Özerinç, Sezer; Department of Mechanical Engineering (2021-12-10)
Carbon fiber reinforced polymer (CFRP) composites are increasingly used in the aerospace industry due to their high specific strength compared to conventional metallic materials. However, a significant shortcoming of these composites is their increased susceptibility to damage. Structural repair is a common method to restore the load-carrying capacity of a damaged part when the damage size exceeds the pre-defined tolerances. Scarf and stepped bonded repair methods are the primary choice for cases that requi...
Anodization of titanium alloys for orthopedic applications
İzmir, Merve; Ercan, Batur; Department of Metallurgical and Materials Engineering (2018)
In recent years, nanostructured oxide films on titanium alloy surfaces have gained significant interest due to their electrical, catalytic and biological properties, leading to an extensive effort to engineer nanostructured oxide films on titanium and titanium alloy surfaces. In literature, there is a variety of different approaches to fabricate nanostructured oxide films, including hydrothermal treatment, sol-gel synthesis, physical vapor deposition, electrodeposition, and etc. Among these methods, electro...
Optimization of the mechanical properties of Ti-6Al-4V alloy produced by three dimensional additive manufacturing using termochemical processes
Bilgin, Güney Mert; Durucan, Caner; Esen, Ziya; Department of Metallurgical and Materials Engineering (2017)
Selective laser melting (SLM) is an additive manufacturing (AM) technology used for aerospace and biomedical Ti-6Al-4V alloys to produce parts with complex geometry at one step with reduced production time, scrap and cost. However, parts produced by SLM are lack of ductility due to microstructures similar to those cast products and residual stresses generated during laser processing. In this study, Ti6Al-4V alloys produced by SLM were treated by thermo-hydrogen process (THP) to increase ductility and to ref...
Synthesis and structural characterization of multifunctional Ti alloy: gum metal
Elçin, Orkun; Akdeniz, M. Vedat.; Department of Metallurgical and Materials Engineering (2020)
Gum metal (Ti-23Nb-0.7Ta-2Zr-1.2O at%), a newly discovered titanium alloy, is considered as a suitable unique alloy for structural applications in aerospace, sports equipment, industrial, and especially in biomedical areas because of their outstanding properties such as high yield strength (up to 2000 MPa) with low elastic modulus (50 GPa), and biocompatibility. Furthermore, in the heavily deformed state, it still possesses an ultra-low elastic modulus, ultra-high-strength, large elasticity (up to 2.5%), El...
Citation Formats
S. Temel Yiğitbaşı, “Mechanical properties of Ti6Al4V parts produced by electron beam melting and topology optimization in different building directions,” M.S. - Master of Science, Middle East Technical University, 2018.
METU IIS - Integrated Information Service open@metu.edu.tr