STRUCTURAL-PHASE STATE AND PROPERTIES OF HYPEREUTECTIC SILUMIN TREATED WITH A PULSED ELECTRON BEAM

The article considers a review of domestic and foreign works on the use of intense pulsed electron beams for surface treatment of metals, alloys, cermet and ceramic materials. The advantages of using electron pulsed beams over laser beams, plasma flows, and ion beams are noted. The promising directions of using electron-beam processing were analyzed and are as following: 1 – smoothing the surface, getting rid of surface microcracks, while simultaneously changing the structural-phase state of the surface layer, to create high-performance technologies for the finishing processing of critical metal products of complex shape made of titanium alloy Ti-6Al-4V and titanium; steels of various classes; hard alloy WC – 10 wt. % Сo; aluminum; 2 – removal of microbursts formed during the manufacture of precision molds (SKD11 steel) and biomedical products (Ti-6Al-4V alloy); 3 – finishing the surface of molds and dies; 4 – improvement of the functional properties of metallic biomaterials: stainless steel, titanium and its alloys, alloys based on titanium nickelide with shape memory effect, and magnesium alloys; 5 – processing of medical devices and implants; 6 – formation of the surface alloys for powerful electrodynamic systems; 7 – improvement of the characteristics of aircraft engine and compressor blades; 8 – formation of thermal barrier coatings applied to the surface of the combustion chambers. It is shown that with the correct choice of process parameters, such as accelerating voltage, energy density of electron beam, number of pulses, and pulse duration, it is possible to control carefully and/or manipulate the characteristics of structural-phase state and surface properties. In order to improve the properties of the material and the durability of the products made of it, an important factor is the structure modification to form a submicro-nanosized grain (or subgrain structure).

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Influence of Structural Phase State of the Surface Layer on Wear Resistance of Cutting Edge of Metal-Ceramic Insert when Metalcutting

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.682.530 ◽

2014 ◽

Vol 682 ◽

pp. 530-536 ◽

Cited By ~ 4

Author(s):

A.S. Ignatyev ◽

А.A. Mokhovikov ◽

V.E. Ovcharenko

Keyword(s):

Wear Resistance ◽

Surface Layer ◽

Electron Beam ◽

Phase State ◽

Structural Phase ◽

Structural Phase State ◽

Electron Beam Processing ◽

Metal Ceramic ◽

Ceramic Insert ◽

Alloy Surface Layer

The paper considers frictional aspects of wear of metal ceramic insert working faces when metalcutting depending on structural phase state of their surface layers.Keywords: metal-ceramic alloy, surface layer, structural phase state, electron-beam processing, resistance of metal-ceramic insert when cutting metal.

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Features of the Structural-Phase State of the Alloy Ti-6Al-4V in the Formation of Products using Wire-Feed Electron Beam Additive Manufacturing

Metal Working and Material Science ◽

10.17212/1994-6309-2018-20.4-60-71 ◽

2018 ◽

Vol 20 (4) ◽

pp. 60-71 ◽

Cited By ~ 3

Author(s):

Nickolai Savchenko ◽

◽

Andrei Vorontsov ◽

Veronika Utyaganova ◽

Alexander Eliseev ◽

...

Keyword(s):

Electron Beam ◽

Additive Manufacturing ◽

Phase State ◽

Structural Phase ◽

Structural Phase State ◽

Wire Feed

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STRUCTURAL-PHASE STATE OF SILUMIN OF HYPEREUTECTIC COMPOSITION IRRADIATED BY A PULSED ELECTRON BEAM

Physical and Chemical Aspects of the Study of Clusters Nanostructures and Nanomaterials ◽

10.26456/pcascnn/2020.12.089 ◽

2020 ◽

pp. 89-102

Author(s):

Юрий Федорович Иванов ◽

Анатолий Анатольевич Клопотов ◽

Елизавета Алексеевна Петрикова ◽

Мария Евгеньевна Рыгина ◽

Олег Сергеевич Толкачев ◽

...

Keyword(s):

Surface Layer ◽

Electron Beam ◽

High Speed ◽

Structural Phase ◽

Instrument Making ◽

Structural Phase State ◽

Pulsed Electron Beam ◽

State Diagrams ◽

Industrial Alloy ◽

Second Phases

Силумин (сплав алюминия с кремнием) является дешевым промышленным сплавом, обладающим хорошей коррозионной стойкостью, высокими удельными механическими свойствами и хорошими литейными свойствами, вследствие чего нашел широкое применение в современной промышленности (авиа- и машиностроение, приборостроение, судостроение и т.д.). Целью настоящей работы является анализ закономерностей преобразования структуры и фазового состава поверхностного слоя силумина заэвтектического состава (Al - 22 вес. % Si ), подвергнутого облучению интенсивным импульсным электронным пучком. Установлено, что облучение силумина импульсным электронным пучком (18 кэВ, 25 Дж/см, 200 мкс, 3 имп., 0,3 с) приводит к плавлению поверхностного слоя толщиной до 60 мкм, высокоскоростная кристаллизация которого сопровождается формированием субмикро- нанокристаллической многофазной структуры. Показано, что алюминий (твердый раствор на основе ГЦК кристаллической решетки) формирует ячейки высокоскоростной кристаллизации; на границах ячеек расположены наноразмерные частицы вторых фаз. Выполнен анализ трехкомпонентных диаграмм состояния системы Al - Si - Fe - Cu (основные элементы исследуемого силумина) и продемонстрирована возможность формирования в сплаве в равновесных условиях большого количества двух- и трехэлементных соединений. Методами дифракционной электронной микроскопии показано, что наряду с трехэлементными фазами в силумине образуются и фазы на основе четырех и, возможно, большего количества элементов. Silumin (an alloy of aluminum with silicon) is a cheap industrial alloy with good corrosion resistance, high specific mechanical properties and good casting properties. As a result it has found wide applications in modern industry (aircraft and mechanical engineering, instrument making, shipbuilding, etc.). The aim of this work is to analyze the regularities of transformation of the structure and phase composition of the surface layer of a hypereutectic silumin (Al - 22 wt % Si), subjected to irradiation with an intense pulsed electron beam. It was found that irradiation of silumin with a pulsed electron beam (18 keV, 25 J / cm, 200 μs, 3 pulses, 0,3 s) leads to melting of the surface layer up to 60 pm thick, the high-speed crystallization of which is accompanied by the formation of a submicro-nanocrystalline multiphase structure. It is shown that aluminum (a solid solution based on fcc crystal lattice) forms cells of high-speed crystallization; nanoscale particles of the second phases are located at the cell boundaries. Analysis of three-component state diagrams of the Al - Si - Fe - Cu system (the main elements of the studied silumin) demonstrated the possibility of forming a large number of two- and three-element compounds in the alloy under equilibrium conditions. It has been shown by diffraction electron microscopy that, along with three-element phases, phases based on four and, possibly, more elements are formed in silumin.

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