- TITLE:
INFLUENCE OF THE PRESSING FORCE ON THE MECHANICAL CHARACTERISTICS OF AN IRON MATRIX OF WATER- DISPERSED POWDERS ALLOYED WITH NICKEL
- AUTHOR(S):
I. Miteva, I. Mitev
- ABSTRACT:
In this publication the influence of the pressing force on the mechanical characteristics of
sintered materials based on water-dispersed iron powders alloyed with nickel is studied. An iron
matrix based on water-dispersed powders type AHC 100.29, to which up to 4% nickel was added,
was studied. After pressing with a force of 300 ÷ 800 MPa, they were sintered at a temperature of
1150ºC for 1h in a dissociated ammonia medium. Experiments were performed to determine tensile
strength, yield strength, elongation, Young's modulus, hardness, impact energy and dimensional
changes. In determining the mechanical characteristics in order to prevent the influence of porosity,
five measurements were made for each type of samples, and in the graphical interpretation of the
results the arithmetic mean values were used.
- PAGES:
47-
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INFLUENCE OF THE PRESSING FORCE ON THE MECHANICAL CHARACTERISTICS OF AN IRON MATRIX OF WATER- DISPERSED POWDERS ALLOYED WITH NICKEL
- TITLE:
STUDY OF THE KINEMATICS OF THE MOVEMENT OF SOLID INCLUSION IN PLASTIC FLOW
- AUTHOR(S):
V. Titov, N. Zlochevska, A. Lavrinenkov, V. Skrypnikova, D. Korotin
- ABSTRACT:
The conditions of interaction of a solid-reinforcing inclusion with a metal matrix of a dispersed-
reinforced composite material in the focus of deformations during isothermal pressing are
considered. As a result of numerical modeling, the mechanism of reorientation in the direction of
metal flow of solid reinforcing inclusions is substantiated. It is shown that the mechanism of rotation
of the inclusion in the direction of flow of the metal depends on the gradient of the velocities of the
material particles of the matrix. It is shown that the use of back pressure improves the interaction
conditions at the boundary surface of the inclusion and the matrix, reduces the likelihood of
microcracks, and the process in hot plastic deformation creates conditions for "healing" of existing
microdamages.
- PAGES:
42-
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STUDY OF THE KINEMATICS OF THE MOVEMENT OF SOLID INCLUSION IN PLASTIC FLOW
- TITLE:
INCREASING THE RESOURCE OF PLASTICITY OF ALUMINUM ALLOY AMG6 BY THERMOMECHANICAL TREATMENT UNDER UNIAXIAL TENSION CONDITIONS
- AUTHOR(S):
V. A. Titov, V. O. Koreva
- ABSTRACT:
Increasing of the plasticity resource by thermomechanical treatment by using intermediate
annealing in the deformation process is investigated. Tensile tests were performed on the specimens.
The elongation of the plasticity of the aluminum alloy AMg6 by thermomechanical treatment during
tensile tests was determined. It is established that the decrease in the efficiency of intermediate
annealing at individual transitions is explained by the accumulation of metal damage during
previous deformation. The assessment shows that intermediate annealing provides an increase in the
resource of plasticity of the material in 1.5… 1.6 times.
- PAGES:
39-
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INCREASING THE RESOURCE OF PLASTICITY OF ALUMINUM ALLOY AMG6 BY THERMOMECHANICAL TREATMENT UNDER UNIAXIAL TENSION CONDITIONS
- TITLE:
POSSIBILITIES OF INCREASING THE PRODUCTIVITY OF THE ULTRASONIC ATOMISER
- AUTHOR(S):
O. Luhovskyi, A. Shulha, A. Zilinskyi, I. Gryshko, A. Movchanuk
- ABSTRACT:
Ultrasonic thin film atomisation produces a quality monodisperse aerosol with a dispersity of up
to 5 ... 30 μm at an ultrasonic frequency of 22 ... 66 kHz. Obtained monodisperse aerosol can be used
in many technological processes, especially when the possibility of using other methods of
atomization is limited by the properties of the liquid. Such technological processes are widely used in
mechanical engineering, chemical industry, medicine and agriculture as part of mechatronic
automation systems and many other industries.
- PAGES:
32-
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POSSIBILITIES OF INCREASING THE PRODUCTIVITY OF THE ULTRASONIC ATOMISER
- TITLE:
RESEARCH OF THE PHENOMENON OF HYDRODYNAMIC LUMINESCENCE IN A TWO-PHASE ENVIRONMENT
- AUTHOR(S):
V. Kryvosheiev, I. Nochnichenko, I. Liberatskyi
- ABSTRACT:
The article presents the results of the study of the phenomenon of hydrodynamic luminescence in
a two-phase medium during cavitation in hydraulic systems.
To conduct an experimental study, an analysis of the literature on the subject of the study was
conducted, a stand based on a hydrodynamic cavitator with an ejector mixer at the inlet was
developed.
The experiment was performed using mineral oil as a working fluid at an inlet pressure of up to 4
MPa and a flow rate of up to 10 -5 m3/s. The main parameters that were monitored: inlet pressure
level, inlet and outlet pressure drop of the sample, flow rate and outlet temperature. Shooting of the
processes occurring inside the model was carried out by the camera at a speed of 120 ... 1000 frames
per second. Cavitation areas were detected by high-speed video recording and the mechanism of its
development in a two-phase medium was studied.
As a result of the experiment, it was found that without saturation with inert gas, luminescence
occurs when the pressure drops by 2 MPa, whereas with the help of a gas mixture (with a
predominant inert gas content) when the pressure drops by 1 MPa.
It is concluded that the phenomenon of hydroluminescence can be used as a method for
visualizing cavitation. It was found that the saturation of a liquid with an inert gas affects the
rheological properties, namely: viscosity, density and physicochemical properties. The modes of the
appearance of the glow were determined separately for each component of the experiment.
- PAGES:
29-
- DOWNLOAD:
RESEARCH OF THE PHENOMENON OF HYDRODYNAMIC LUMINESCENCE IN A TWO-PHASE ENVIRONMENT
