Study on Combustion Behavior of TC4 and Ti40 Alloys

2013 ◽  
Vol 747-748 ◽  
pp. 872-877
Author(s):  
Ming Yue Huang ◽  
She Wei Xin ◽  
Jian Hui Ju ◽  
Ya Feng Lu ◽  
Qian Li ◽  
...  
Keyword(s):  
Titanium Alloy ◽  
Valence State ◽  
Combustion Surface ◽  
Transitional Zone ◽  
Combustion Products ◽  
Layer By Layer ◽  
Influence Zone ◽  
Alloy Increase ◽  
Effect Of Oxygen ◽  
Porous State

Abstract. OM, XRD, SEM, EDS were used to test. and analyze the combustion products of TC4 and Ti40 alloys by layer-by-layer from reaction frontier to matrix The result shows that: titanium alloy can be divided into 4 sections, combustion surface (CS), molten zone (MZ), transitional zone (TZ) and influence zone (IZ). The CS is mainly consist of TiO2, and with oxide of V. Cr2O3 and SiO2 are detected on CS of Ti40. MZ of TC4 is in loose and porous state. There are lots of cracks and holes in the TZ and IZ; MZ of Ti40 is compact, between MZ and IZ there is a TZ which is rich of V and Cr, it can stop oxygen diffusing effectively. From the MZ to matrix, oxygen content reduces gradually, and oxide of Ti with different valence state is detected. Because of effect of oxygen, the hardness of the two alloy increase after combustion, increment of Ti40 is much greater than that of TC4.

A34 Effect of Oxygen-including Compounds on MQL Machining of Titanium Alloy

2014 ◽  
Vol 2014.10 (0) ◽  
pp. 51-52
Author(s):  
Toshiaki WAKABAYASHI ◽  
Keisuke YAMADA ◽  
Toshifumi ATSUTA ◽  
Akira TSUKUDA
Keyword(s):  
Titanium Alloy ◽  
Effect Of Oxygen

scholarly journals Osteocytes Influence on Bone Matrix Integrity Affects Biomechanical Competence at Bone-Implant Interface of Bioactive-Coated Titanium Implants in Rat Tibiae

2021 ◽  
Vol 23 (1) ◽  
pp. 374
Author(s):  
Sabine Stoetzel ◽  
Deeksha Malhan ◽  
Ute Wild ◽  
Christian Helbing ◽  
Fathi Hassan ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Titanium Alloy ◽  
Hyaluronic Acid ◽  
Self Assembly ◽  
Bone Matrix ◽  
Preclinical Study ◽  
Titanium Implants ◽  
Layer By Layer ◽  
Bioactive Coatings ◽  
Bone Interface

Osseointegration is a prerequisite for the long-term success of implants. Titanium implants are preferred for their biocompatibility and mechanical properties. Nonetheless, the need for early and immediate loading requires enhancing these properties by adding bioactive coatings. In this preclinical study, extracellular matrix properties and cellular balance at the implant/bone interface was examined. Polyelectrolyte multilayers of chitosan and gelatin or with chitosan and Hyaluronic acid fabricated on titanium alloy using a layer-by-layer self-assembly process were compared with native titanium alloy. The study aimed to histologically evaluate bone parameters that correlate to the biomechanical anchorage enhancement resulted from bioactive coatings of titanium implants in a rat animal model. Superior collagen fiber arrangements and an increased number of active osteocytes reflected a significant improvement of bone matrix quality at the bone interface of the chitosan/gelatin-coated titan implants over chitosan/hyaluronic acid-coated and native implants. Furthermore, the numbers and localization of osteoblasts and osteoclasts in the reparative and remodeling phases suggested a better cellular balance in the chitosan/Gel-coated group over the other two groups. Investigating the micro-mechanical properties of bone tissue at the interface can elucidate detailed discrepancies between different promising bioactive coatings of titanium alloys to maximize their benefit in future medical applications.

scholarly journals Material Characterisation and Computational Thermal Modelling of Electron Beam Powder Bed Fusion Additive Manufacturing of Ti2448 Titanium Alloy

Materials ◽  
2021 ◽  
Vol 14 (23) ◽  
pp. 7359
Author(s):  
Qiushuang Wang ◽  
Wenyou Zhang ◽  
Shujun Li ◽  
Mingming Tong ◽  
Wentao Hou ◽  
...  
Keyword(s):  
Titanium Alloy ◽  
Electron Beam ◽  
Thermal History ◽  
Computational Modelling ◽  
Layer By Layer ◽  
Powder Bed Fusion ◽  
Material Microstructure ◽  
Powder Bed ◽  
Β Phase ◽  
Α Phase

Ti-24Nb-4Zr-8Sn (Ti2448) is a metastable b-type titanium alloy developed for biomedical applications. In this work, cylindrical samples of Ti2448 alloy have been successfully manufactured by using the electron beam powder bed fusion (PBF-EB) technique. The thermal history and microstructure of manufactured samples are characterised using computational and experimental methods. To analyse the influence of thermal history on the microstructure of materials, the thermal process of PBF-EB has been computationally predicted using the layer-by-layer modelling method. The microstructure of the Ti2448 alloy mainly includes β phase and a small amount of α” phase. By comparing the experimental results of material microstructure with the computational modelling results of material thermal history, it can be seen that aging time and aging temperature lead to the variation of α” phase content in manufactured samples. The computational modelling proves to be an effective tool that can help experimentalists to understand the influence of macroscopic processes on material microstructural evolution and hence potentially optimise the process parameters of PBF-EB to eliminate or otherwise modify such microstructural gradients.

scholarly journals Formation of Structure and Properties of Two-Phase Ti-6Al-4V Alloy during Cold Metal Transfer Additive Deposition with Interpass Forging

Materials ◽  
2021 ◽  
Vol 14 (16) ◽  
pp. 4415
Author(s):  
Yuri Shchitsyn ◽  
Maksim Kartashev ◽  
Ekaterina Krivonosova ◽  
Tatyana Olshanskaya ◽  
Dmitriy Trushnikov
Keyword(s):  
Heat Treatment ◽  
Titanium Alloy ◽  
Physical And Mechanical Properties ◽  
Metal Transfer ◽  
Layer By Layer ◽  
Structure And Properties ◽  
Two Phase ◽  
Cold Metal Transfer ◽  
Α Phase ◽  
Cold Metal

The paper deals with the main formation patterns of structure and properties of a titanium alloy of the Ti-6Al-4V system during additive manufacturing using cold metal transfer (CMT) wire deposition. The work aims to find the optimal conditions for layer-by-layer deposition, which provides the high physical and mechanical properties of the titanium alloy of the Ti-6Al-4V system hybrid, additively manufactured using CMT deposition. Particular attention is paid to interpass forging during the layered printing of the product. Additionally, we investigate how the heat treatment affects the structure and properties of the Ti-6Al-4V alloy that has been CMT-deposited, both with and without forging. These studies have shown that the hybrid multilayer arc deposition technology, with interpass strain hardening, allows the use of high temperature and high technology titanium alloys to obtain products of a required geometric shape. It has been proven that the interpass deformation effect during CMT deposition contributes to a significant decrease in the sizes of the primary β-grains. In addition, forging enhances the effect of microstructure refinement, which is associated with phase recrystallization in deformed areas. It is shown that the heat treatment leads not only to a change in the morphology of the phases but also to additional phase formations in the structure of the Ti-6Al-4V-deposited metal while the mechanism is realized and consists of the gradual decomposition of the martensitic α′-phase and the formation of a dispersive α2-phase. This structure formation process is accompanied by the dispersion hardening of the α-phase. The strength characteristics of the Ti-6Al-4V alloy obtained using layer-by-layer CMT with forging are given; they exceed the strength level of materials obtained with the traditional technologies of pressure treatment, and there is no decrease in plasticity characteristics. The use of the subsequent heat treatment makes it possible to increase the ductility characteristics of the deposited and forged Ti-6Al-4V material by 1.5–2 times without strength loss.

scholarly journals On the in situ elimination of pores during laser powder bed fusion of a titanium alloy

2021 ◽  
Author(s):  
ling zhang ◽  
Wenhe Liao ◽  
Tingting Liu ◽  
Huiliang Wei ◽  
Changchun Zhang
Keyword(s):  
Titanium Alloy ◽  
Real Time ◽  
Laser Power ◽  
Layer By Layer ◽  
Powder Bed Fusion ◽  
Laser Powder Bed Fusion ◽  
Powder Bed ◽  
Printing Quality ◽  
High Laser

Abstract The printing quality of the laser powder bed fusion (LPBF) components largely depends on the presence of various defects such as massive porosity. Thus, the efficient elimination of pores is an important factor to the production of a sound LPBF product. In this work, the efficacy of two in situ laser remelting approaches on the elimination of pores during LPBF of a titanium alloy Ti-6.5Al-3.5Mo-l.5Zr-0.3Si (TC11) were assessed using both experimental and computational methods. These two remelting methods are the surface remelting, and the layer-by-layer printing and remelting. A multi-track and multi-layer phenomenological model was established to compute the evolution of pores with the temperature and velocity fields. The results showed that surface remelting with a high laser power such as 180 W laser can effectively eliminate pores within three deposited layers. However, such a remelting cannot reach defects in deeper regions. Alternatively, the layer-by-layer remelting with a laser power of 180 W can effectively eliminate the pores formed in the previous layer in real time. The results obtained from this work can provide useful guidance for the in situ control of printing defects supported by the real time monitoring, feedback and operation systems of the intelligent LPBF equipment.

scholarly journals Quantifying the effect of oxygen on micro-mechanical properties of a near-alpha titanium alloy

2021 ◽  
Author(s):  
H. M. Gardner ◽  
P. Gopon ◽  
C. M. Magazzeni ◽  
A. Radecka ◽  
K. Fox ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Titanium Alloy ◽  
Electron Backscatter Diffraction ◽  
Atom Probe ◽  
Solid Solution Hardening ◽  
Low Oxygen ◽  
Order Of Magnitude ◽  
Oxygen Ingress ◽  
Effect Of Oxygen ◽  
Oxygen Concentrations

AbstractTitanium alloys are widely used in the aerospace industry, yet oxygen ingress can severely degrade the mechanical properties of titanium alloy components. Atom probe tomography (APT), electron probe microanalysis (EPMA) and nanoindentation were used to characterise the oxygen-rich layer on an in-service jet engine compressor disc, manufactured from the titanium alloy TIMETAL 834. Oxygen ingress was quantified and related to changes in mechanical properties through nanoindentation studies. The relationship between oxygen concentration, microstructure, crystal orientation and hardness has been explored through correlative hardness mapping, EPMA and electron backscatter diffraction (EBSD). It has been found that the hardening effects of microstructure and crystallography are only significant at very low-oxygen concentrations, whereas interstitial solid solution hardening dominates by order of magnitude for higher oxygen concentrations. The role of microstructure on oxygen ingress has been studied and oxygen ingress along a potential α/β interface was directly observed on the nanoscale using APT.

ALLOWANCE FOR THE EFFECT OF CONDENSED PARTICLES ON BALLISTIC PARAMETERS OF A SHOT

2021 ◽  
pp. 50-59
Author(s):  
V.A. Burakov ◽  
◽  
A.S. D'yachkovskiy ◽  
A.N. Ishchenko ◽  
V.Z. Kasimov ◽  
...  
Keyword(s):  
Energy Exchange ◽  
Equations Of State ◽  
Burning Velocity ◽  
Combustion Products ◽  
Condensed Phases ◽  
Layer By Layer ◽  
Energy Characteristics ◽  
Wide Range ◽  
Powder Particles ◽  
Propellant Charge

A mathematical model of the shot fired from a powder propellant setup is developed. An arbitrary number of powder particles of various types are supposed to be in a propellant charge, which are different in size, shape, energy characteristics, and layer-by-layer burning velocity. The products of their combustion represent a mixture of non-viscous non-heat conductive gases with known equations of state. These gases are generated during combustion of the powder particle of a corresponding type. Some condensed particles may occur in the mixture of combustion products during the burning of powder particles. The motion of the polydispersed mixture of combustion products along a varying-cross-section channel is described by the laws of conservation of mass, momentum, and energy. When formulating these laws, the mass, momentum, and energy exchange between gas and condensed phases is taken into account. The formulation is universal and allows one to use the laws for modelling a wide range of internal ballistic phenomena. In this paper, a theoretical parametric research is shown as an example, which is aimed at estimating the effect of quantity of the occurring condensed particles on basic ballistic characteristics of a shot.

scholarly journals Study of titanium alloy Ti6242S oxidation behaviour in air at 560°C: Effect of oxygen dissolution on lattice parameters

2020 ◽  
Vol 164 ◽  
pp. 108049 ◽  
Author(s):  
M. Berthaud ◽  
I. Popa ◽  
R. Chassagnon ◽  
O. Heintz ◽  
J. Lavková ◽  
...  
Keyword(s):  
Titanium Alloy ◽  
Oxidation Behaviour ◽  
Lattice Parameters ◽  
Oxygen Dissolution ◽  
Effect Of Oxygen

Strongly coupled polypyrrole/molybdenum oxide hybrid films via electrochemical layer-by-layer assembly for pseudocapacitors

2019 ◽  
Vol 7 (16) ◽  
pp. 9815-9821 ◽  
Author(s):  
Ming-Yue Zhang ◽  
Yu Song ◽  
Di Guo ◽  
Duo Yang ◽  
Xiaoqi Sun ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Molybdenum Oxide ◽  
Valence State ◽  
Hybrid Film ◽  
Layer By Layer ◽  
Hybrid Films ◽  
Strongly Coupled ◽  
Layer By Layer Assembly ◽  
Kinetics Of ◽  
Layer Assembly

A strongly coupled layer-by-layer (LbL) PPy/MoOx hybrid film is demonstrated. The spectroscopy results indicate the protonation level of PPy is enhanced and the valence state of Mo in MoOx is reduced, which synergistically improve the charge transfer kinetics of the composites.

MICROSTRUCTURE AND WEAR PROPERTIES OF COMPOSITE COATINGS PRODUCED BY LASER CLADDING OF Ti-6Al-4V WITH GRAPHITE AND SILICON MIXED POWDERS

2005 ◽  
Vol 12 (02) ◽  
pp. 161-165 ◽  
Author(s):  
Y. S. TIAN ◽  
C. Z. CHEN ◽  
D. Y. WANG ◽  
Q. H. HUO ◽  
T. Q. LEI
Keyword(s):  
Titanium Alloy ◽  
Friction Coefficient ◽  
Laser Cladding ◽  
Energy Dispersive Spectroscopy ◽  
Composite Coatings ◽  
Transitional Zone ◽  
Test Results ◽  
X Ray Diffraction ◽  
Wear Properties ◽  
X Ray

Composite coatings are fabricated by laser cladding of titanium alloy Ti-6Al-4V with graphite and silicon mixed powders. X-ray diffraction (XRD) and energy dispersive spectroscopy (EDS) indicate that the coatings mainly consist of pre-eutectic TiC and eutectic Ti 5 Si 3 compounds. Test results show that the coatings exhibit a higher microhardness and a lower friction coefficient compared with the as-received sample. EPMA micrographs show that the compounds' morphology in the top zone of the coatings is different from that in the transitional zone.

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