scholarly journals WELDING ALUMINIUM ALLOYS REFRACTORY MODIFIERS TREATMENT – THE EFFECTIVE METHOD FOR CHARACTERISTICS INCREASING

2019 ◽  
Vol 27 (4) ◽  
pp. 74-78
Author(s):  
Natalia Yevgrafovna Kalinina ◽  
Tatyana Valerevna Nosova ◽  
Alexander Vasilievich Kalinin ◽  
Stella Igorevna Mamchur ◽  
Anton Albertovich Shakhov ◽  
...  
Keyword(s):  
Titanium Carbide ◽  
Aluminium Alloys ◽  
Strength Properties ◽  
Grain Structure ◽  
Pure Aluminium ◽  
Structure And Properties ◽  
Before And After ◽  
Sample Method ◽  
Plasmachemical Synthesis ◽  
Alloys Of The Al

The effect of modification by refractory dispersed compositions on the grain structure and properties of welded aluminium alloys is determined. Aluminium alloys of the Al-Mg-Mn system of chemical composition were studied: 4.8-6.0% magnesium, 0.3-0.5% manganese; 0.45 – 0.90% iron; aluminium - base. The iron content corresponded to the pre-eutectic and post-eutectic compositions of the aluminium-iron system. Titanium carbide (TiC) modifier powders with a dispersion of 1-5 microns obtained by the method of plasmachemical synthesis. The microstructure of the alloys was studied using MIM-8 and Neophot-2 optical microscopes. The strength properties of the alloys were determined using the MUP-20 machine. Production of samples was carried out according to GOST 1497-84 and GOST 9454-80. Fluidity was determined by the spiral sample method. The properties of alloys before and after modification were investigated. Improved technological properties of aluminium alloys after modification. Increased fluidity in AMg5 and 1420 alloys by 1.5% and 6%, respectively. The obtained homogeneous dispersed structure of aluminium alloys after modification. The strength properties of modified alloys are increased by20 %. Experiments were conducted on the effect of the charge type on the structure and properties of technically pure aluminium and aluminium alloys AMg5 and 1420. The advantage of solid charge in the smelting of aluminium ingots in reducing porosity and grinding grain in comparison with the use of liquid charge is established. The effective effect of the refractory modifier of titanium carbide on the properties of aluminium alloys is proved.

scholarly journals Influence of nanomodication on structure for-mation and properties of structural steel

2021 ◽  
pp. 34
Author(s):  
V.I. Bolshakov ◽  
Alexander Kalinin
Keyword(s):  
Plastic Deformation ◽  
Grain Size ◽  
Grain Structure ◽  
Titanium Carbonitride ◽  
Structure And Properties ◽  
Process Technology ◽  
Plasma Chemical ◽  
Initial State ◽  
Nanodispersed Powder ◽  
Before And After

The state of the problem of grinding the grain structure and improving the mechanical properties of low-alloy structural steels has been studied. The state of the problem of grain structure refinement and improving the mechanical properties of low-alloy structural steels has been studied. The role of nanodispersed additives is reduced to the creation of additional artificial crystallization centers in the melt. They must be consistent with the critical radiuses of the embryos. According to our calculations, for the grinding of primary austenite grains in castings, the size of the introduced particles should be 40–50 nm. Output and modified castings of 09G2 and 09G2S steels were subjected to severe plastic deformation by equal-channel angular pressing followed by low-temperature annealing at 350 °C. In the initial state, cast steels 09G2 and 09G2S had a ferrite-pearlite structure with an average primary austenite grain size of 30 μm; after modification and deformation, the grain size was 10 μm. After quenching and cooling in water, the structure has changed insignificantly - ferritic-reed, with an average grain size of ~ 8...10 microns. After cooling the quenched samples in a solution of 20 % NaCl in water, the structure of packet martensite was obtained. In the initial state, the studied steels have insufficiently high property values: microhardness Нμ up to 3000 MPa, yield point σ 0,2 up to 800 MPa. When quenching in water, the hardness somewhat increases, the most significant increase is observed when the samples are cooled in a NaCl solution. Due to the significant grinding of martensite crystals, accelerated cooling provides a greater increase in hardness. A nanodispersed powder of titanium carbonitride Ti (CN) with a fraction of 50...100 nm was obtained by the method of plasma-chemical synthesis, the process technology was developed. Intensive plastic deformation of 09G2 and 09G2S steel castings was carried out. The structure and properties of steels before and after treatments have been studied. As a result of the combination of hardening methods, the grain size of the steels was reduced by 3 times and the yield strength increased from 3000 to 4000 MPa. Nanodispersed powder of titanium carbonitride Ti (CN) with a fraction of 50...100 nm was obtained by the method of plasma chemical synthesis, and a process technology was developed. Intensive plastic deformation of castings of 09G2 and 09G2S steels was carried out. The structure and properties of steels before and after treatments were studied. As a result of a combination of hardening methods, grinding of steel grains by 3 times and increasing the yield strength from 3000 to 4000 MPa was achieved

scholarly journals Investigation of the Structure and Properties of Deformed Semi-Finished Products from Alloys of the Al-REM System Made by the Method of Ingotless Rolling-Extruding

2020 ◽  
Vol 837 ◽  
pp. 9-15
Author(s):  
Vadim Bespalov ◽  
Sergey Sidelnikov ◽  
Viktor Berngardt ◽  
Denis Voroshilov ◽  
Olga Yakivyuk ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Electrical Resistivity ◽  
Chemical Composition ◽  
Grain Structure ◽  
Metallographic Analysis ◽  
Structure And Properties ◽  
Alloy Structure ◽  
Deformed State ◽  
Alloys Of The Al

The article presents the investigation results of the structure and properties of rods of aluminum alloys containing zirconium, cerium and lanthanum after ingotless rolling-extruding (IRE) and heat treatment. The patterns of changes in the microstructure, mechanical properties, electrical resistivity depending on the chemical composition of the alloys, processed by the IRE method and various modes of rods annealing are shown. A metallographic analysis of the grain structure of the samples in a deformed state and after annealing performed. The temperatures at which the alloy structure remains stable and maintains the level of operational properties revealed. The effect of chemical composition on the heat resistance of deformed semi-finished products represented. The study made it possible to evaluate the level of properties of experimental alloys after processing by the method of ingotless rolling-extruding and various modes of rods annealing.

Study of the Structure and Properties of Especially Strong Aluminum Alloys of the Al–Zn–Mg–Cu System

Metallurgist ◽  
2017 ◽  
Vol 60 (9-10) ◽  
pp. 978-982 ◽  
Author(s):  
O. G. Senatorova ◽  
A. V. Bronz ◽  
V. V. Cheverikin ◽  
A. V. Somov ◽  
N. E. Blinova
Keyword(s):  
Aluminum Alloys ◽  
Structure And Properties ◽  
Alloys Of The Al

Effect of Equal-Channel Angular Pressing (ECAP) on Creep in Aluminium Alloys

2007 ◽  
Vol 539-543 ◽  
pp. 2904-2909 ◽  
Author(s):  
Vàclav Sklenička ◽  
Jiří Dvořák ◽  
Marie Kvapilová ◽  
Milan Svoboda ◽  
Petr Král ◽  
...  
Keyword(s):  
Equal Channel Angular Pressing ◽  
Aluminium Alloys ◽  
Creep Resistance ◽  
Room Temperature ◽  
Creep Behaviour ◽  
Coarse Grained ◽  
Pure Aluminium ◽  
Creep Tests ◽  
Angular Pressing ◽  
Compression Creep

This paper examines the effect of equal-channel angular pressing (ECAP) on creep behaviour of pure aluminium, binary Al-0.2wt.%Sc alloy and ternary Al-3wt.%Mg-0.2wt.%Sc alloy. The ECAP was conducted at room temperature with a die that had a 90° angle between the channels and 8 repetitive ECAP passes followed route BC. Constant stress compression creep tests were performed at 473 K and stresses ranging between 16 to 80 MPa on ECAP materials and, for comparison purposes, on the initial coarse-grained materials. The results showed that the creep resistance of the ECAP processed Al-Sc and Al-Mg-Sc alloys was markedly deteriorated with respect to unpressed coarse-grained materials.

Interrelationship between the structure and properties of hard metals based on titanium carbide

1979 ◽  
Vol 18 (10) ◽  
pp. 739-744
Author(s):  
A. N. Pilyankevich ◽  
T. A. Shapoval ◽  
G. T. Dzodziev ◽  
V. N. Paderno
Keyword(s):  
Titanium Carbide ◽  
Structure And Properties ◽  
Hard Metals

Correlation between the structure and properties of oriented films of polyethylene terephthalate before and after zone annealing

1989 ◽  
Vol 31 (12) ◽  
pp. 2801-2810
Author(s):  
I.G. Perepechko ◽  
M.V. Ivanov ◽  
V.D. Zanegin ◽  
V.I. Gerasimov ◽  
N.K. Ronzhin
Keyword(s):  
Polyethylene Terephthalate ◽  
Structure And Properties ◽  
Oriented Films ◽  
Before And After

Formation of a nickel-clad titanium carbide coating and effect of spraying conditions on its structure and properties

1982 ◽  
Vol 21 (10) ◽  
pp. 776-780 ◽  
Author(s):  
F. I. Kitaev ◽  
A. S. Namychkin ◽  
A. G. Bakanov ◽  
L. M. Ryabich ◽  
I. I. Timofeeva ◽  
...  
Keyword(s):  
Titanium Carbide ◽  
Structure And Properties ◽  
Carbide Coating

Weldability: Effect of Alloying Element Sc, Mn, and Zr on Alloys of the Al-Mg-Sc-Mn-Zr System

2019 ◽  
Author(s):  
V. I. Lukin
Keyword(s):  
Aluminum Alloys ◽  
Practical Importance ◽  
Strength Properties ◽  
Strength Characteristics ◽  
Mg Alloy ◽  
Alloying Element ◽  
Processing Properties ◽  
Alloys Of The Al ◽  
Effect Of Alloying

Scandium in aluminum alloys behaves as the most efficient modifier of the structure of the material and as an agent suppressing recrystallization. This unique behavior of scandium in alloys of the Al-Mg system greatly increases the strength characteristics, whilst retaining on a higher level the ductility and processing properties of deformed semi-finished products. This article describes the effect of complex alloying the Al-6.3% Mg alloy with scandium, manganese and zirconium on the weldability and strength properties of the material is of considerable scientific and practical importance.Investigations.

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