Structural-phase state and mechanical properties of the surface layer of the copper modified by titanium ions

2018 ◽  
Author(s):  
M. V. Fedorischeva ◽  
M. P. Kalashnikov ◽  
I. A. Bozhko ◽  
V. P. Sergeev
Keyword(s):  
Mechanical Properties ◽  
Surface Layer ◽  
Phase State ◽  
Structural Phase ◽  
Structural Phase State

scholarly journals Structural-Phase State, Mechanical Properties, Acoustic and Magnetic Characteristics in the Sustainable Deformation Localization Zones of Power Equipment Made of Structural and Heat Resistant Steels

Metals ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 1638
Author(s):  
Nikolay Ababkov ◽  
Alexandr Smirnov ◽  
Vladimir Danilov ◽  
Lev Zuev ◽  
Natalya Popova ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Phase State ◽  
Structural Phase ◽  
Magnetic Characteristics ◽  
Internal Stresses ◽  
Power Equipment ◽  
Deformation Localization ◽  
Structural Phase State ◽  
Heat Resistant ◽  
Heat Resistant Steels

The paper presents the results of the analysis of the microstructure, mechanical properties, acoustic and magnetic characteristics of the metal of pipelines that are part of heat and power equipment, after long-term operation, made of structural and heat-resistant steels in the zones of localization of plastic deformation. Samples of 0.2 С steel and 0.12С-1Сr-1Mo-1V steel were studied in the initial state, as well as after operation for 219 and 360 thousand hours, respectively. As a result of the studies carried out for each sample, the phase composition was determined (qualitatively and quantitatively), and the following parameters of the fine structure were calculated: volume fractions of structural components of steel (pearlite and ferrite), scalar and excess ± dislocation density, curvature-torsion of the crystal lattice χ, amplitude of internal stresses (shear stress and long-range stresses). All quantitative parameters of the structure are determined both in each structural component of steel, and in general for each sample. The structure of the metal of all specimens after deformation before the formation of zones of stable localization of deformations consists of a ferrite-pearlite mixture, and for specimens after operation before fracture only of unfragmented and fragmented ferrite. Ferrite, which occupies the bulk of the material, is present both unfragmented and fragmented. For all samples, the ratios ≥ , χ = χpl, σL ≥ σd were calculated, which indicate whether there is a danger of the initiation of microcracks in metal samples. For specimens without operation and after operation without damage in zones of stable localization of deformations, these conditions are met, and for specimens after operation until destruction, they are not met. It was found that the structural-phase state in the zones of localization of deformations has a direct effect on the characteristics of non-destructive tests. Thus, for all investigated samples, the values of such parameters as the delay time of the surface acoustic wave, the attenuation coefficient, the amplitude of the received signal, and the intensity of magnetic noise in the zones of deformation localization were established.

Features of damage and modification of surface layers of Al and its alloys by powerful energy flows in a plasma focus device

2021 ◽  
Vol 9 ◽  
pp. 34-52
Author(s):  
V. N. Pimenov ◽  
◽  
S.A. Maslyaev ◽  
Keyword(s):  
Surface Layer ◽  
Plasma Focus ◽  
Phase State ◽  
Structural Phase ◽  
Pulsed Laser ◽  
Plasma Focus Device ◽  
Deuterium Plasma ◽  
Surface Layers ◽  
Pulsed Laser Radiation ◽  
Structural Phase State

The results of the analysis of damageability and modification of the structural-phase state of the surface layers of aluminum and its alloys by powerful flows of fast high-energy ions and high-temperature plasma in Plasma focus devices, as well as using pulsed laser radiation. Pure Al, an alloy of the Al – Mg – Li system, a duralumin alloy, and a composition of a ceramic coating Al2O3 on an Al substrate are considered. It is shown that in the regime of Al irradiation with a power density of q ≈ 106 – 107 W/cm2 in the nano- and microsecond range of pulse durations, ultrafast crystallization of melted surface layer occurs with the formation of a wavy surface relief and the structural fragments of sub-microcrystalline and nanoscale size. After the action of deuterium plasma flows on a duralumin alloy tube located along the axis of the Plasma focus device a modification of the structural-phase state of the alloy is observed: the initial two-phase state of an αAl-solid solution of copper in aluminum and inclusions of the second phase of CuAl2 became fine-grained and single-phase due to the dissolution of CuAl2 particles in the melt. Irradiation of an alloy of the Al – Mg – Li system containing (wt %) 2 % Li and 5 % Mg at q = 5·106 W/cm2, t = 50 – 100 ns after four pulsed impacts of fast ions and deuterium plasma led to the modification the structural-phase state of the surface layer of the alloy, associated with an increase in the content of magnesium oxide and a decrease in the crystal lattice parameter of the Al-based solid solution. The formation of spherical cavities due to the evaporation of lithium into the internal micropores of the surface layer was also found. The low damage and structural stability of Al2O3 ceramics on an Al substrate under beam-plasma impacts in plasma focus device with a radiation power density q ≤ 108 – 109 W/cm2 in the nano- and microsecond range of pulse duration is noted. At the same time, the Al2O3/Al composition was unstable to pulsed laser radiation in the free-running mode (q = 105 – 106 W/cm2, t = 0.7 ms) and Q-switch mode (q = 107 – 108 W/cm2, t = 80 ns). In both cases the coating peeled off from the substrate.

Changing of the Structural-Phase State and Mechanical Properties of VT-23 Titanium Alloy under Surface Treatment by Intense Flux of Copper Ions

2015 ◽  
Vol 1085 ◽  
pp. 284-288 ◽  
Author(s):  
Viktor Sergeev ◽  
Mark P. Kalashnikov ◽  
Vasilii V. Neufeld
Keyword(s):  
Mechanical Properties ◽  
Titanium Alloy ◽  
Phase State ◽  
Copper Ions ◽  
Structural Phase ◽  
Ion Current ◽  
High Flux ◽  
Structural Phase State ◽  
Ion Treatment ◽  
Ion Current Density

Results of surface modification of the VT-23 titanium alloy by high flux of copper ions with an energy of 2 keV and ion current density of 3.5 mA/cm2 was studied. The dependence of the microhardness and penetration depth of ion as function of duration of ion treatment was determined. Structural-phase state of ion-modified of the VT-23 titanium samples surface layer was investigated by TEM and SEM. Microhardness was researched by nanoindentation method.

Investigation of the Influence of Electrolytic-Plasma Processing on Structural-Phase State and Mechanical Properties of the 40CrNiAl Alloy

2014 ◽  
Vol 1044-1045 ◽  
pp. 67-70
Author(s):  
Mazhyn Skakov ◽  
Gulnara Yerbolatova ◽  
Nurgamit Kantai ◽  
Michael Scheffler
Keyword(s):  
Mechanical Properties ◽  
Solid Solution ◽  
Phase State ◽  
Structural Phase ◽  
Plasma Processing ◽  
Structural Phase State ◽  
Dispersed Particles ◽  
Electrolytic Plasma Processing

It is shown that as a result of electrolytic plasma carburization is released from the solid solution carbides dispersed particles based alloy components, i.e. hardening occurs. Found that after processing the surface of the alloy samples 40CrNiAl modified form reinforced layers whose thickness depends on the time, temperature and processing of components of the electrolyte.

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