The Influence of Thermocyclic Treatment on the Structure and Mechanical Properties of Pseudo-Alpha Titanium Alloys for Steam Turbine Blades

2021 ◽  
Vol 1031 ◽  
pp. 117-124
Author(s):  
Vladimir Gadalov ◽  
Irina Vornacheva ◽  
Sergey Voinash ◽  
Vitaly Ignatenko ◽  
Evgeny Remshev
Keyword(s):  
Mechanical Properties ◽  
Titanium Alloys ◽  
Structural Characteristics ◽  
Turbine Blades ◽  
Strength Properties ◽  
High Temperature Strength ◽  
Cycling Treatment ◽  
Thermocyclic Treatment ◽  
Alpha Titanium ◽  
Steam Turbine Blades

The influence of thermal cycling treatment of pseudo-α-titanium alloys OT4 and VT20 on their structural and substructural characteristics, as well as their mechanical properties is considered. A significant change in structural characteristics is established. This contributes to an increase in the strength properties of alloys with satisfactory ductility and high-temperature strength.

Effect of heat treatment on non-stationary modes on structure of pseudo-α-titanium alloys used for steam turbine blades

2020 ◽  
pp. 283-286
Author(s):  
I.V. Vornacheva
Keyword(s):  
Heat Treatment ◽  
Heat Resistance ◽  
Titanium Alloys ◽  
Steam Turbine ◽  
Structural Characteristics ◽  
Turbine Blades ◽  
Strength Properties ◽  
Thermocyclic Treatment ◽  
Steam Turbine Blades

The effect of thermocyclic treatment of pseudo-α-titanium alloys OT4 and VT20 on their structural and substructural characteristics is considered. Signifi cant change in structural characteristics is established, this contribu tes to increase in the strength properties of alloys with satisfactory ductility and heat resistance.

Brazed coatings for steam turbine blades: impact of the tape architecture and composition on mechanical properties

2020 ◽  
Vol 111 (11) ◽  
pp. 916-922
Author(s):  
K. Bobzin ◽  
W. Wietheger ◽  
J. Hebing ◽  
L. Gerdt ◽  
H. Krappitz ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Steam Turbine ◽  
Volume Fraction ◽  
Steel Substrate ◽  
Turbine Blades ◽  
Surface Hardness ◽  
Three Point Bending ◽  
Wear And Corrosion ◽  
Steam Turbine Blades ◽  
Positive Effect

Abstract Ni-based brazing coatings with tungsten or chromium carbides are used for wear and corrosion protection in various applications. Steam turbine blades especially present a highly stressed application in which in particular the resistance to erosion and corrosion is essential. Therefore, novel tape architectures of brazed coatings have been developed and investigated within this study. In contrast to the use of powders, the application by means of tapes offers a high potential with regard to later use in industry due to the reproducible handling and automation. In this work, different coating systems were successfully deposited by means of vacuum brazing on X12CrNiMo-12 steel substrate. In order to achieve a sufficient fracture toughness of the coatings, pure nickel powder was added to the tapes. The influence of this additive on the mechanical properties was analyzed by means of three-point bending tests. A positive effect has been observed when adding a volume fraction of φ(Ni) = 25% of nickel, increasing the flexural strength up to σf = 580 MPa. Furthermore, the surface hardness of the coating has been analyzed depending on coating architecture and post-deposition treatment by grinding.

Influence of Laser Cladding Parameters on γ-TiAl Coatings

2014 ◽  
Vol 698 ◽  
pp. 273-276
Author(s):  
Iuliia N. Maliutina ◽  
Hocine Si-Mohand ◽  
Romain Piolet
Keyword(s):  
Mechanical Properties ◽  
Titanium Alloys ◽  
Laser Cladding ◽  
Structural Characteristics ◽  
Maximum Value ◽  
Powder Density

Relationships between laser cladding parameters (i.e. powder density) and structural characteristics as well as mechanical properties of γ-TiAl-based clads on titanium alloys were investigated. The conducted study revealed that the height of the formed clads increases linearly with powder density. The maximum value of microhardness corresponds to clad produced at the lowest powder density.

Effect of different types of thermal cycling treatment on mechanical properties of 44NKhTYu elinvar alloy

2020 ◽  
pp. 520-523
Author(s):  
N.V. Red'kina ◽  
Yu.V. Bugrov
Keyword(s):  
Mechanical Properties ◽  
Thermal Cycling ◽  
Cycling Treatment ◽  
Thermal Cycling Treatment ◽  
Thermocyclic Treatment ◽  
Different Types ◽  
Elinvar Alloy

The results of the effect of experimental regimes of thermocyclic treatment of elinvar 44NKhTYu alloy on its mechanical properties are presented.

Study of wear mechanism of contact surfaces of steam turbine blades made of titanium VT6 alloy

2021 ◽  
pp. 81-89
Author(s):  
A.M. Zolotov ◽  
M.O. Smirnov ◽  
T.A. Chizhik
Keyword(s):  
Mechanical Properties ◽  
Steam Turbine ◽  
Wear Mechanism ◽  
Turbine Blades ◽  
Microstructural Analysis ◽  
X Ray ◽  
Different Types ◽  
Steam Turbine Blades ◽  
Contact Surfaces

The contact surfaces of the banding shelves of adjacent steam turbine blades made of titanium VT6 alloy after operation are studied by fractography, micro-X-ray and microstructural analysis and determination of mechanical properties. The different types of destruction of the contact surfaces are analyzed and explained. It is shown that the reason for intensive abrasion of the turbine blades' binding meshes is violation of the welding mode in the station conditions.

MICROSTRUCTURAL MODELING OF COLD CREEP/FATIGUE IN NEAR ALPHA TITANIUM ALLOYS USING CELLULAR AUTOMATA METHOD

2008 ◽  
Vol 32 (2) ◽  
pp. 195-212 ◽  
Author(s):  
N. Boutana ◽  
P. Bocher ◽  
M. Jahazi ◽  
D. Piot ◽  
F. Montheillet
Keyword(s):  
Mechanical Properties ◽  
Cellular Automata ◽  
Titanium Alloys ◽  
Experimental Studies ◽  
Processing Parameters ◽  
Creep Tests ◽  
Creep Fatigue ◽  
Alpha Titanium ◽  
Set Up ◽  
Empirical Approaches

It is well known that the presence of large heterogeneous textured regions in forged near alpha titanium alloys could lead to large variations of mechanical properties when fatigue and creep cycles are applied at room temperature. On the other hand, experimental studies and microtexture investigations are complex to set up, lengthy and costly, and one cannot expect to understand the alloy behavior by relying only on empirical approaches. Hence, numerical methods are excellent alternatives for analyzing the influence of microscopic and macroscopic heterogeneities on mechanical properties in shorter times and with minimum need for experimentation. In the present investigation, a cellular automata (CA) method was used to simulate the effect of texture heterogeneities, on both local and global mechanical properties. A 2D array of cells was used and the stresses and strains developed in various heterogeneous regions were evaluated using the Eshelby theory. Using the CA method, various types of microstructures were modeled and compared with each other to quantify the influence of processing parameters on mechanical properties. The results predict, and are used to explain, the experimentally phenomena observed in creep responses during cold fatigue/creep tests of near alpha titanium samples.

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