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 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.

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

Unusual Effect of Oxygen on the Mechanical Behavior of a β-Type Titanium Alloy Developed for Biomedical Applications

2012 ◽  
Vol 706-709 ◽  
pp. 135-142 ◽  
Author(s):  
Mitsuo Niinomi ◽  
Masaaki Nakai
Keyword(s):  
Tensile Strength ◽  
Titanium Alloy ◽  
Mechanical Behavior ◽  
Titanium Alloys ◽  
Biomedical Applications ◽  
The Other ◽  
Excess Oxygen ◽  
Ω Phase ◽  
Other Hand ◽  
Effect Of Oxygen

Oxygen enhances the strength of titanium alloys in general; however, excess oxygen can make titanium alloys brittle. On the other hand, oxygen enhances the precipitation of the α phase and suppresses the formation of the ω phase. Thus, using the optimal amount of oxygen is important to improve the mechanical properties of titanium alloys. The role of oxygen in titanium alloys is still not well understood. The effect of oxygen on the mechanical behavior of a β-type titanium alloy, Ti-29Nb-13Ta-4.6Zr (referred to as TNTZ), which is used for biomedical applications, was investigated in this study. Oxygen was found to stabilize the ω phase in TNTZ. This behavior of oxygen is unusual considering the known behavior of oxygen in titanium alloys: oxygen is known to suppress the formation of the ω phase in titanium alloys. A small amount of oxygen increases the tensile strength but decreases the ductility of TNTZ. On the other hand, a large amount of oxygen, of around 0.7 mass%, increases both the tensile strength and the ductility of TNTZ. This phenomenon is unexpected.

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.

The effect of oxygen pressure on the fretting wear of titanium alloys

2020 ◽  
Vol 34 (13) ◽  
pp. 2050128
Author(s):  
Xuejiao Wei ◽  
Liangliang Sheng ◽  
Hao Li ◽  
Xiaojun Xu ◽  
Jinfang Peng ◽  
...  
Keyword(s):  
Wear Resistance ◽  
Titanium Alloy ◽  
Oxygen Pressure ◽  
Wear Mechanism ◽  
Significant Influence ◽  
Wear Behavior ◽  
Fretting Wear ◽  
Oxygen Environment ◽  
Slip Regime ◽  
Effect Of Oxygen

A systematic experimental investigation was conducted to study the effect of oxygen environment of different pressure on the fretting wear behavior of Ti6Al4V titanium alloy. In order to well probe the real tribo-chemical state, in this work, an in-situ X-ray photoelectron spectroscopy (XPS) analysis test developed by a self-designed high precision fretting wear tester integrated with an XPS equipment was used. The tribo-oxidation formed at the different oxygen pressure and its effect on the fretting wear mechanism and the resulting fretting wear volume in the different fretting run regime were discussed. Results show that the oxygen environment of different pressure has significant influence on the wear resistance of titanium alloy depending on the fretting run regime. In the partial slip regime (PSR), different oxygen pressure plays a little influence on fretting wear behavior, while a significant influence for the mixed fretting regime (MFR) and slip regime (SR). The tribo-oxidations produced at the oxygen environment of different pressure for the different fretting run regimes are found to correlate well with the resulting fretting wear mechanism and the fretting wear resistance.

scholarly journals Correction: Tang, L. et al., Effect of Oxygen Variation on High Cycle Fatigue Behavior of Ti-6Al-4V Titanium Alloy. Materials 2020, 13, 3858

Materials ◽  
2020 ◽  
Vol 13 (23) ◽  
pp. 5364
Author(s):  
Luyao Tang ◽  
Jiangkun Fan ◽  
Hongchao Kou ◽  
Bin Tang ◽  
Jinshan Li
Keyword(s):  
Titanium Alloy ◽  
High Cycle Fatigue ◽  
Fatigue Behavior ◽  
Cycle Fatigue ◽  
Effect Of Oxygen

The author wishes to make the following correction to this paper [...]

Effect of oxygen implantation upon the corrosion resistance of the OT-4-0 titanium alloy

1997 ◽  
Vol 96 (2-3) ◽  
pp. 223-229 ◽  
Author(s):  
D. Krupa ◽  
J. Baszkiewicz ◽  
J. Kozubowski ◽  
A. Barcz ◽  
G. Gawlik ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Titanium Alloy ◽  
Oxygen Implantation ◽  
Effect Of Oxygen

A TEM study of the effect of oxygen on nanocavity formation and precipitation in rapid - solidified Fe-16Ni-9Cr stainless steels

1994 ◽  
Vol 52 ◽  
pp. 700-701
Author(s):  
S. Wisutmethangoon ◽  
T. F. Kelly ◽  
J.E. Flinn
Keyword(s):  
Stainless Steels ◽  
High Mobility ◽  
Hot Extrusion ◽  
Extrusion Ratio ◽  
Gas Atomization ◽  
Cavity Formation ◽  
Nucleation Sites ◽  
Heat Treated ◽  
Different Types ◽  
Effect Of Oxygen

Vacancies are introduced into the crystal phase during quenching of rapid solidified materials. Cavity formation occurs because of the coalescence of the vacancies into a cluster. However, because of the high mobility of vacancies at high temperature, most of them will diffuse back into the liquid phase, and some will be lost to defects such as dislocations. Oxygen is known to stabilize cavities by decreasing the surface energy through a chemisorption process. These stabilized cavities, furthermore, act as effective nucleation sites for precipitates to form during aging. Four different types of powders with different oxygen contents were prepared by gas atomization processing. The atomized powders were then consolidated by hot extrusion at 900 °C with an extrusion ratio 10,5:1. After consolidation, specimens were heat treated at 1000 °C for 1 hr followed by water quenching. Finally, the specimens were aged at 600 °C for about 800 hrs. TEM samples were prepared from the gripends of tensile specimens of both unaged and aged alloys.

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