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Showing 1 to 20 of 99 for “"Ti-6Al-4V"”.
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The multi-pass deformation of Ti-6Al-4V
Ti-6Al-4V is a two phase alloy used in the aerospace, military and biomedical industries. The thermomechanical processing (TMP) of Ti-6A-4V involves the breakdown of the ingot microstructure at temperatures above the beta transus (Tβ) into fine lamellar colonies. Subsequent hot deformation is …
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Flexible Media Polishing Machine for Ti-6Al-4V Components
… from hard to machine materials such as Ti-6Al-4V and tungsten carbide and have extreme surface finish requirements. Flexolap polishing offers a technique to achieve these requirements, and minimizes the disadvantages encountered by other polishing techniques. The aim of this dissertation …
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Laser Nitrided and TiN coated Ti-6Al-4V alloy surfaces
Titanium alloys are widely used in aerospace industry due to their low density and high toughness to mass ratios. However, the wear resistance of the titanium alloys is poor and requires surface treatment for the effective usage. One of the methods to improve the surface properties is to nitride …
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Fatigue and Fracture of Electron Beam Melting Ti-6Al-4V
<p>For applications in the aerospace field, selection of materials for a given design requires an understanding of critical properties, like fatigue and fracture, in addition to static mechanical and physical properties. With the ongoing advancements in metallic additive manufacturing techniques …
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Thermomechanical processing of blended elemental powder Ti-6Al-4V alloy
This research investigates the feasibility of producing Ti-6Al-4V products by creating low cost BE sintered preforms and then subjecting these preforms to thermomechanical processing (TMP) in an attempt to both improve the relative density and refine the microstructure. The powders used were direct …
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Characterization and Thermal Modeling of Laser Formed Ti-6Al-4V
… work focuses on three aspects of laser formed Ti-6Al-4V: an evaluation of the as-deposited and heat treated macro and microstructures and preliminary results obtained from a model developed to calculate the temperature profile resultant of the laser forming process. A "solution treat and age" …
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Microstructural development during high strain-rate forging of Ti-6Al-4V
Includes bibliographical references.
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High-cycle fatigue / low-cycle fatigue interactions in Ti-6Al-4V
… and compressor components in the cold frontal sections of commercial and military gas turbine engines has been attributed to high cycle fatigue (HCF). Additionally, both high-cycle fatigue (HCF) and lowcycle fatigue (LCF) loadings are widely recognized as unavoidable during operation of these …
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Residual stress measurement and structural integrity evaluation of SLM Ti-6Al-4V
… placed significant pressure on material capabilities and the manufacturing systems. The next generation of manufacturing methodologies are being developed in the Additive Manufacturing (AM) arena from which Selective Laser Melting (SLM) has emerged as a promising candidate for producing highly …
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Machining of additively manufactured titanium Ti-6Al-4V; cutting forces and chip morphology
This thesis studies the machining of additively manufactured (AM) titanium Ti-6Al-4V and presents a model to determine Johnson Cook (J-C) constitutive parameters from complex machining processes through numerical modeling and experimental validation. The J-C parameters are important in describing …
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Microscale strain accumulation during fatigue and fracture of additively manufactured Ti-6Al-4V
… the different microstructural features in additively manufactured and conventionally manufactured Ti-6Al-4V alloys to the observed fatigue and fracture behaviors. Additively manufactured Direct Metal Laser Melted (DMLM) Ti-6Al-4V samples with two different build orientations and build layer …
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Effect of oxygen diffusion hardening on fatigue resistance in Ti-6Al-4V alloys
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 …
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Fracture mechanics based fatigue and fracture toughness evaluation of SLM Ti-6Al-4V
… project was to determine experimentally the fatigue and fracture toughness characteristic, from a fracture mechanics perspective, of Ti-6Al-4V titanium alloy manufactured by Selective Laser Melting (SLM). Three build orientations are considered where a fatigue crack is grown parallel and two …
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Parametric study on the compactibility of Ti-6Al-4V during direct powder rolling
The widespread use of titanium and its alloys in structural applications has been limited to few highend applications. The dominant reason for this being cost implications. These high costs arise from extracting titanium from its mineral form as well as that of the manufacturing processes to …
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Build strategy investigation of TI-6AL-4V produced via a hybrid additive manufacturing process
“Till now, laser metal deposition (LMD) has been developed with the capability of near-net shape high-performance metal parts fabrication, especially complicated titanium alloys, nickel alloys, and aluminum alloys. However, LMD processed parts usually do not meet end-use requirements without post …
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Dual scale porosity effects on crack-defect interactions in additively manufactured Ti-6Al-4V
This Thesis was approved for publication on 2021-04-30 at 11:34.
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Homogenisation of titanium - 6 aluminium - 4 vanadium (TI-6AL-4V) powder blends during sintering
Titanium alloys have received significant attention in recent years primarily within the aerospace sector due to their superior material properties, high strength to weight ratios and high resistance to corrosion. However, high processing costs associated with the alloys have hindered their usage …
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Adhesion study of thermoplastic polyimides with Ti-6Al-4V alloy and PEEK-graphite composites
High glass transition (eg. 360 °C) melt processable thermoplastic polyimide homopolymers and poly(imide-siloxane) segmented copolymers were prepared from a number of diamines and dianhydrides via solution imidization, polydimethylsiloxane segment incorporation and molecular weight control with …
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Thermal and Microstructure Modeling of Metal Deposition Processes with Application to Ti-6Al-4V
Laser metal deposition (LMD) offers a unique combination of process flexibility, time savings, and reduced cost in producing titanium alloy components. The current challenge in processing titanium alloys using LMD methods is understanding the complex microstructure evolution as a part is fabricated …
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