Effect of increased temperatures on structures of titanium VT22 alloy strengthened by electromechanical processing

2020 ◽  
pp. 376-379
Author(s):  
S.A. Yakovlev ◽  
M.M. Zamal’dinov ◽  
A.A. Glushchenko ◽  
I.R. Salakhutdinov
Keyword(s):  
Titanium Alloys ◽  
Heating Temperature ◽  
Alloy Vt22 ◽  
Vt22 Alloy ◽  
Machine Parts ◽  
Operational Modes

The hardening methods of titanium alloys are analyzed. Effect of heating temperature on resistance of VT22 alloy structures strengthened by electromechanical processing is defined. Results of change in hardness of the strengthened structures depending on heating temperature are presented. Recommendations on the operational modes of machine parts made of alloy VT22 strengthened by electromechanical processing are provided.

Device for Testing Pipe Billet

2020 ◽  
Vol 299 ◽  
pp. 1166-1171 ◽  
Author(s):  
Phyo Wai Aung ◽  
Maryin S. Borisovich
Keyword(s):  
Titanium Alloys ◽  
Heating Temperature ◽  
Experimental Studies ◽  
Protective Atmosphere ◽  
Pipeline Systems

Experimental studies of the influence of the heating temperature on the properties of pipe billets made of titanium alloys OT4 and OT4-1 in the formation of parts for the installation of pipeline systems without a protective atmosphere are presented.

scholarly journals Hole accuracy increase at hole reaming in hard-to-machine parts

2018 ◽  
Vol 2018 (6) ◽  
pp. 18-23 ◽  
Author(s):  
Сергей Агапов ◽  
Sergey Agapov ◽  
Юрий Сидякин ◽  
Yuryi Sidyakin ◽  
Олег Корпелянский ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Titanium Alloys ◽  
Tool Geometry ◽  
Ultrasonic Oscillation ◽  
Basic Parameters ◽  
Machine Parts ◽  
Accuracy Increase ◽  
The Impact

The investigation results of the tool geometry impact upon accuracy of holes worked in hard-to-machine parts at the ultrasonic oscillation introduction in a cutting area are shown. The processes of hole reaming in parts made of stainless steel and titanium alloys at ultrasonic oscillation application upon a tool are considered. Tool basic parameters defining the accuracy of holes obtained are defined. The regularities of the impact of face and back angles of reamer cutting ends, an angle of an intake cone and a tool spiral direction upon a hole smash are revealed.

Effect of Heat Treatment on the Structure and Properties of Titanium Alloy VT22 Welded Joints Produced by TIG-Welding with Flux-Cored Wire

2018 ◽  
Vol 927 ◽  
pp. 119-125 ◽  
Author(s):  
V.P. Prilutsky ◽  
S.V. Akhonin ◽  
S.L. Schwab ◽  
I.K. Petrychenko
Keyword(s):  
Heat Treatment ◽  
Titanium Alloy ◽  
Welded Joints ◽  
Heating Temperature ◽  
Phase Region ◽  
Alloy Vt22 ◽  
Two Phase ◽  
Cored Wire ◽  
Titanium Alloy Vt22 ◽  
Strength And Ductility

An important part in affecting the properties of the titanium alloy VT22 is a heat treatment (HT). Annealing of welded joints of the alloy also works as strengthening HT. Depending on the heating temperature, duration of annealing and the cooling rate, different combinations of strength and ductility could be obtained. Annealing is carried out in the VT22 alloy two-phase region (750 - 850 °C) followed by direct or stepwise cooling. This heat treatment results in a maximum heterogeneity of the structure with nearly an equal amount of α and β phases. It also provides a tensile strength of 1100 - 1300 MPa.

Direct Observation of the Diffusionless β → β + ω Transformation in Titanium Alloys

1971 ◽  
Vol 29 ◽  
pp. 122-123
Author(s):  
N. E. Paton ◽  
D. de Fontaine ◽  
J. C. Williams
Keyword(s):  
Electron Microscope ◽  
Titanium Alloys ◽  
Direct Observation ◽  
Dark Field ◽  
X Ray Diffraction ◽  
Resistivity Measurements ◽  
Selected Area Electron Diffraction ◽  
Ti Alloys ◽  
Thin Foils ◽  
Field Device

The electron microscope has been used to study the diffusionless β → β + ω transformation occurring in certain titanium alloys at low temperatures. Evidence for such a transformation was obtained by Cometto et al by means of x-ray diffraction and resistivity measurements on a Ti-Nb alloy. The present work shows that this type of transformation can occur in several Ti alloys of suitable composition, and some of the details of the transformation are elucidated by means of direct observation in the electron microscope.Thin foils were examined in a Philips EM-300 electron microscope equipped with a uniaxial tilt, liquid nitrogen cooled, cold stage and a high resolution dark field device. Selected area electron diffraction was used to identify the phases present and the ω-phase was imaged in dark field by using a (101)ω reflection. Alloys were water quenched from 950°C, thinned, and mounted between copper grids to minimize temperature gradients in the foil.

The Ordered Phase Formation in Ti-Al-Ga Alloys

1970 ◽  
Vol 28 ◽  
pp. 440-441
Author(s):  
Shiro Fujishiro ◽  
Harold L. Gegel
Keyword(s):  
Thermal Stability ◽  
High Temperature ◽  
Titanium Alloys ◽  
Growth Kinetics ◽  
Stoichiometric Composition ◽  
Good Potential ◽  
Alpha Titanium ◽  
Cold Rolled ◽  
Kinetics Of ◽  
Thermal Stability Of

Ordered-alpha titanium alloys having a DO19 type structure have good potential for high temperature (600°C) applications, due to the thermal stability of the ordered phase and the inherent resistance to recrystallization of these alloys. Five different Ti-Al-Ga alloys consisting of equal atomic percents of aluminum and gallium solute additions up to the stoichiometric composition, Ti3(Al, Ga), were used to study the growth kinetics of the ordered phase and the nature of its interface.The alloys were homogenized in the beta region in a vacuum of about 5×10-7 torr, furnace cooled; reheated in air to 50°C below the alpha transus for hot working. The alloys were subsequently acid cleaned, annealed in vacuo, and cold rolled to about. 050 inch prior to additional homogenization

TEM characterization of reaction zone in a SiC fiber-reinforced titanium alloy

1988 ◽  
Vol 46 ◽  
pp. 738-739
Author(s):  
G. Das ◽  
R. E. Omlor
Keyword(s):  
Titanium Alloys ◽  
Reaction Zone ◽  
Carbon Layer ◽  
Fiber Reinforced ◽  
Reaction Products ◽  
Sic Fibers ◽  
Sic Fiber ◽  
The Matrix ◽  
Immense Potential

Fiber reinforced titanium alloys hold immense potential for applications in the aerospace industry. However, chemical reaction between the fibers and the titanium alloys at fabrication temperatures leads to the formation of brittle reaction products which limits their development. In the present study, coated SiC fibers have been used to evaluate the effects of surface coating on the reaction zone in the SiC/IMI829 system.IMI829 (Ti-5.5A1-3.5Sn-3.0Zr-0.3Mo-1Nb-0.3Si), a near alpha alloy, in the form of PREP powder (-35 mesh), was used a茸 the matrix. CVD grown AVCO SCS-6 SiC fibers were used as discontinuous reinforcements. These fibers of 142μm diameter contained an overlayer with high Si/C ratio on top of an amorphous carbon layer, the thickness of the coating being ∽ 1μm. SCS-6 fibers, broken into ∽ 2mm lengths, were mixed with IMI829 powder (representing < 0.1vol%) and the mixture was consolidated by HIP'ing at 871°C/0. 28GPa/4h.

A New Detector System For The HB5 Stem Instrument

1985 ◽  
Vol 43 ◽  
pp. 134-135
Author(s):  
J.M. Cowley
Keyword(s):  
Dark Field ◽  
Detector System ◽  
Electron Holography ◽  
Small Specimen ◽  
Bright Field ◽  
Multiple Images ◽  
Practical Applications ◽  
Wide Range ◽  
Diffraction Patterns ◽  
Operational Modes

The HB5 STEM instrument at ASU has been modified previously to include an efficient two-dimensional detector incorporating an optical analyser device and also a digital system for the recording of multiple images. The detector system was built to explore a wide range of possibilities including in-line electron holography, the observation and recording of diffraction patterns from very small specimen regions (having diameters as small as 3Å) and the formation of both bright field and dark field images by detection of various portions of the diffraction pattern. Experience in the use of this system has shown that sane of its capabilities are unique and valuable. For other purposes it appears that, while the principles of the operational modes may be verified, the practical applications are limited by the details of the initial design.

High-resolution EM investigation about effect of stress on formation of ω-phase crystals in β-tttanium alloys

1996 ◽  
Vol 54 ◽  
pp. 1006-1007
Author(s):  
E. Sukedai ◽  
M. Shimoda ◽  
A. Fujita ◽  
H. Nishizawa ◽  
H. Hashimoto
Keyword(s):  
High Resolution ◽  
Titanium Alloys ◽  
High Resolution Electron Microscopy ◽  
Dark Field ◽  
Zone Refining ◽  
Ω Phase ◽  
Α Phase ◽  
Nucleation Sites ◽  
Resolution Electron ◽  
Bcc Structure

ω-phase particles formed in β-titanium alloys (bcc structure) act important roles to their mechanical properties such as ductility and hardness. About the ductility, fine ω-phase particles in β–titanium alloys improve the ductility, because ω-phase crystals becomes nucleation sites of α-phase and it is well known that (β+α) duplex alloys have higher ductility. In the present study, the formation sites and the formation mechanism of ω-phase crystals due to external stress and aging are investigated using the conventional and high resolution electron microscopy.A β-titanium alloy (Til5Mo5Zr) was supplied by Kobe Steel Co., and a single crystal was prepared by a zone refining method. Plates with {110} surface were cut from the crystal and were pressured hydrostatically, and stressed by rolling and tensile testing. Specimens for aging with tensile stress were also prepared from Ti20Mo polycrystals. TEM specimens from these specimens were prepared by a twin-jet electron-polishing machine. A JEM 4000EX electron microscope operated at 400k V was used for taking dark field and HREM images.

The Development of Recommendations for Machinability of Ti-6Al-4V Titanium Alloys by Optimizing the Heat Treatment Modes

2018 ◽  
Vol 12 (9) ◽  
pp. 771
Author(s):  
Yuliia Borisovna Egorova ◽  
Liudmila Vasilevna Davydenko ◽  
Evgeniy Nikolaevich Egorov ◽  
Evgeniy Valeryevna Chibisova
Keyword(s):  
Heat Treatment ◽  
Titanium Alloys
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