Structural-phase condition, unelastic and plastic behavior and nanohardness of the TiNi surface layers modified by an ion- and electron irradiation

The effect of different cutting (mechanical heat treatment) on the structural-phase condition and the internal stress field in the surface layers of the product is considered in the article. The regularities of acoustic characteristics depending on the parameters of the structure and stress for the development of nondestructive method for assessing the quality of the surface layer are identified

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Changes of Mechanical Properties of Steel 12Cr18Ni10Тi after Electrolytic-Plasma Cementation

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.601.59 ◽

2012 ◽

Vol 601 ◽

pp. 59-63 ◽

Cited By ~ 5

Author(s):

Sherzod Kurbanbekov ◽

Маzhyn Skakov ◽

Michail Scheffler ◽

Azret Naltaev

Keyword(s):

Mechanical Properties ◽

Mechanical Characteristics ◽

Structural Phase ◽

Plasma Processing ◽

Hardened Layer ◽

High Wear Resistance ◽

Operational Parameters ◽

Surface Layers ◽

Fine Grained ◽

Phase Condition

In the present work the results of electrolytic-plasma treatment influence on the mechanical properties and structural-phase condition of steel’s 12Cr18Ni10Ti surface layers. In the work, the mechanical characteristics of steel’s surface layers are investigated, cemented in electrolytic plasma with the composition of 10 % Nа2CO3 and 10 % С3Н8О3. The operational parameters for the processing are determined. The optimal content of components in saturating mixtures of plasma by cementation is defined. According to the study it is found that, after electrolyte plasma processing, high wear resistance and hardness increased in 2-2.5 times more than in the original condition. The hardened layer with thickness 30-65 µm is formed. It is shown that after the electrolyte-plasma processing of steel 12Cr18Ni10Ti, microstructure contains particles of carbides and has a fine-grained martensitic structure.

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Evolution of Structural-Phase States in TiNi Surface Layers Synthesized by Electron Beam Treatment

Journal of Nanotechnology ◽

10.1155/2010/605362 ◽

2010 ◽

Vol 2010 ◽

pp. 1-8 ◽

Cited By ~ 10

Author(s):

L. L. Meisner ◽

A. I. Lotkov ◽

Yu. P. Mironov ◽

A. A. Neyman

Keyword(s):

Internal Stress ◽

Intermediate Layer ◽

Martensite Transformation ◽

Stress Concentrator ◽

Structural Phase ◽

Martensite Phase ◽

Relaxation Processes ◽

Surface Layers ◽

Tini Surface ◽

B2 Phase

The paper presents the results of X-ray diffraction analysis of nonequilibrium structural and elastic stress states in TiNi surface layers irradiated by low-energy electron beams. It is found that a surface layer with a mixed (2D columnar and 3D equiaxial) submicrocrystalline structure is formed on the irradiated side of the TiNi specimens, and the volume fractions of the two structure types depend on the beam energy parameters and number of pulses. The B2 phase synthesized in the layer is characterized by lattice microstrain due to stresses of the first and second kinds (εI≈±1%,εII=0.25%), and the layer as such is an internal stress concentrator for underlying layers of the material. In the intermediate layer beneath the stress concentrator, relaxation of irradiation-induced internal stress takes place. It is shown that the main mechanism of the relaxation is partialB2→B19′martensite transformation. TheB19′martensite phase in the intermediate layer decreases the microstrain in the conjugate B2 phase. The thickness of the layer in which the relaxation processes develop through theB2→B19′martensite transformation is 10–15μm.

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Influence of Regimes Electrolytic Plasma Cementation on the Mechanical Properties of Steel 12Cr18Ni10Ti

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.531-532.173 ◽

2012 ◽

Vol 531-532 ◽

pp. 173-177 ◽

Cited By ~ 3

Author(s):

Mazhyn Skakov ◽

Sherzod Kurbanbekov ◽

Michail Scheffler

Keyword(s):

Mechanical Properties ◽

Structural Phase ◽

Plasma Processing ◽

Implementation Process ◽

High Hardness ◽

Hardened Layer ◽

Operational Parameters ◽

Surface Layers ◽

Fine Grained ◽

Phase Condition

In the present work the results of electrolytic-plasma treatment influence on the mechanical properties and structural-phase condition of steel’s 12Cr18Ni10Ti surface layers. In the work, the mechanical characteristics of steel’s surface layers are investigated, cemented in electrolytic plasma with the composition 10 % Nа2CO3 and 10 % С3Н8О3. The operational parameters for the processing are determined. The optimal content of components in saturating mixtures plasma by cementation defined. According to the study it is found that, after electrolyte plasma processing, high hardness increased in 2-2.5 times more than in the original condition. The hardened layer with thickness 30-65 µm is formed. It is shown that after the electrolyte-plasma processing of steel 12Cr18Ni10Ti, microstructure contains particles carbides and has fine-grained martensitic structure. The advantages this method are: small energy consumption high speeds annealing opportunity of local surface processing details complex configuration, operating in the conditions intensive loads, easy implementation process.

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STRUCTURAL AND PHASE CHANGES OF THE SURFACE LAYERS OF HEATRESISTANT MULTICOMPONENT COATING OF ION-PLASMA COATING Ni-Cr-Al-Y AFTER MODIFICATION BY HIGH-CURRENT ELECTRON BEAMS MICROSECOND DURATION

Periódico Tchê Química ◽

10.52571/ptq.v17.n34.2020.483_p34_pgs_459_468.pdf ◽

2020 ◽

Vol 17 (34) ◽

pp. 459-468

Author(s):

Oksana A BYTSENKO ◽

Igor G STESHENKO ◽

Vladimir A PANOV ◽

Victor V TISHKOV ◽

Alexey B MARKOV

Keyword(s):

Electron Beams ◽

Structural Phase ◽

Plasma Coating ◽

Phase Changes ◽

High Current ◽

Surface Layers ◽

Heat Resistant ◽

Ion Plasma ◽

Current Electron ◽

High Current Electron

The development of aerospace engineering and mechanical engineering directly depends on the development of new metal materials and advanced technologies. The problem of creating materials and their types of processing to increase the level of operational properties is relevant in connection with the complication and tightening of working conditions of modern technologies. One of the most important tasks of contemporary aircraft construction is to increase the operational properties of the surface layer. The purpose of the article is to elucidate the effect of high-current electron beams of microsecond duration on changes in the surface layers of the heat-resistant multicomponent ion-plasma coating Ni-Cr-Al-Y under various conditions. Using a complex of metallophysical research methods, the physicochemical and structural-phase states of the surface layer were studied before and after modification of the samples. These samples were coated with heat-resistant condensed ion-plasma coatings of three different compositions using nine high-current electron beams in 9 modes with different values of electron energy and number of pulses in the selected interval of electron energy. An analysis of the structural phase changes occurring during modification was carried out. Cylindrical samples of targets made of heat-resistant nickel alloy ZhS36 coated with ion-plasma condensed multicomponent coating SDP-2 + VSDP-16. These samples were used according to serial technology, both with subsequent modification using highcurrent electron beams and without modification. It was found that chromium in the initial state is unevenly distributed: chromium is present in the particles; the matrix is depleted in chromium. The research results can be useful for scientists to study the properties of heat-resistant multicomponent ion-plasma coatings Ni-Cr-Al-Y and the effect of high-current electron beams on it, as well as for the manufacture of more heat-resistant materials in aerospace engineering and mechanical engineering.

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Changes in structural-phase state and physicochemical properties of tungsten-free TIC-TiNi hard alloys after various types of ion-beam treatment

Omsk Scientific Bulletin ◽

10.25206/1813-8225-2021-176-5-9 ◽

2021 ◽

pp. 5-9

Author(s):

V. V. Akimov ◽

◽

A. M. Badamshin ◽

S. N. Nesov ◽

S. N. Povoroznyuk ◽

...

Keyword(s):

Physicochemical Properties ◽

Phase State ◽

Ion Beam ◽

Structural Phase ◽

Experimental Methods ◽

Hard Alloys ◽

Surface Layers ◽

Initial State ◽

Structural Phase State ◽

Ion Beam Treatment

Using experimental methods of analysis, the morphology, elemental composition and chemical state of hard alloys of the «TiC-TiNi» system in the initial state and after various types of ion-beam treatment have been investigated. It is found that the effect of a continuous ion beam leads to an increase in the microhardness of the investigated alloys by 10–12 %. When samples are irradiated with a pulsed ion beam, as a result of destruction of surface layers, the microhardness value decreases by 20 %, as a result of which this type of modification is not preferable for alloys of the TiC-TiNi system

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

Perspektivnye Materialy ◽

10.30791/1028-978x-2021-9-34-52 ◽

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.

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