Method of casting aluminum alloy, aluminum alloy and method for the production of intermediate products

 

(57) Abstract:

The invention is intended to increase the ductility of aluminum alloys and their deformability upon receipt of the products while maintaining the high strength properties. Method of casting aluminum alloys includes a continuous supply of molten aluminum alloy into the mold, the heat from the field of liquid metal, processing of liquid metal in the mould spatially inhomogeneous magnetic field with increasing magnetic induction vector along the crystallization zone in the direction of casting, crystallization and the formation of a casting made from an alloy based on aluminum, containing, by weight. %: magnesium 9,5 - 11,5, zirconium 0,05 - 0,2, beryllium 0,03 - 0,15, titanium 0,02 - 0,1, aluminum - else, while the alloy has a dense homogeneous crystalline structure with evenly distributed in the matrix particles with a particle size from 5000 to 200000. Method for the production of intermediate products from the specified alloy includes homogenization, extrusion at a temperature not exceeding 350oC, rolling at a temperature not exceeding 350oC, quenching and manufacture of intermediate products having deformability in a cold state when itabl.

The invention relates to metal alloys, in particular to methods of casting aluminum alloys, aluminum alloys and the methods of production of these intermediate products can be used in the production of deformed semi-finished products (extruded, rolled, extruded) aluminum alloys and other nanomagnetics alloys such as copper alloys, magnesium alloys, zinc alloys, and others.

Most effectively the invention can be used in the automotive industry, in particular, for the manufacture of body parts of cars.

Products of aluminum alloys can be effectively used for the manufacture of parts of car bodies, and the alloy from which they are made, must possess both high strength and high plastic properties, good deformability, shtampuemostju, weldability, good corrosion resistance and having a small specific gravity. Most fully with these conditions respond aluminum-magnesium alloys.

Currently known high-alloy aluminum-magnesium alloys (Ryazanov N. I., koncewicz C. Y., Lebedeva T. I., Y. Filatov A. Aluminum body - future lei automobile bodies, have not sufficiently high mechanical properties (tensile strength from 210 to 310 MPa; yield strength of from 100 to 160 MPa.

In addition, these aluminum-magnesium alloys during cold deformation show a pronounced physical yield strength, manifested in the form of traces lines of Luders, which degrades the appearance of the product.

Known high-alloy aluminum-magnesium casting alloys (Aliyev, S. , Altman, M. B., Ambartsumian S. M., and others, Handbook of Industrial aluminum alloys. M.: metallurgy, 1984, S. 394 - 415), which has high strength properties, are not high enough plastic properties, i.e. low deformability at the stage of manufacture of rolled semi-finished products, and limited stampability at the stage of manufacturing products, therefore they cannot be used for production of parts of automobile bodies which are manufactured using the operation deep drawing.

In this regard, in the foreground the problem of creating an alloy having high properties as casting and wrought alloys, as well as ways of casting and producing therefrom intermediate products for the manufacture of parts surrounding a continuous supply of pre-molten aluminum alloy into the mold, where the area occupied by the liquid metal, continuously heat for crystallization of the metal and formation of the ingot, in the zone of crystallization of the metal is exposed to a unidirectional magnetic field constant along the height of the crystallization zone having a magnetic induction of about 0,188 T.

Influencing the specified magnetic field on liquid metal, carry out braking of convective flow of the metal, thereby decreasing the width of the liquid-solid mushy" phase, which exists between the isotherms of the liquidus and solidus, and reduced dendritic and zonal segregation of alloying components and impurities present in the alloy.

However, the foregoing is typical for alloys with a fairly narrow interval of crystallization, and alloys with a wide interval of crystallization, in particular alloys containing such signalisierung component as magnesium, especially when high concentrations specified magnetic field is not effectively influences formed during primary crystallization of the intermetallic compounds and the inhibition of their growth, which reduces the structural and chemical homogeneity of the alloy and not PR is Rina liquid - solid phase alloy with a wide interval of crystallization remains quite large and may not sufficiently reduce micro - and macrolevel. Dendritic cells solid solution of aluminum and dendritic (intergranular) enable insufficiently crushed that reduces plastic properties and the processability of the alloy during deformation and nasledovatela is transmitted to the properties of the finished product.

Known aluminum alloy (SU, A, 439535) that contains, wt%:

Magnesium - 4,0 - 7,5

Zirconia - 0,5 - 3,5

Manganese is 0.2 - 1, ON

Cobalt - 0,05 - 0, 5

Bor - 0,05 - 0,3

Titanium - 0,01 - 0,3

Zinc - 0,01 - 0, 7

Chrome - 0,01 - 0,3

Beryllium is 0.0001 - 0,005

Aluminum - Rest

The alloy has a sufficiently high strength properties and good weldability. However, the high content of refractory alloying components, such as zirconium, manganese, titanium and chromium, both individually each, and their combination (total content) leads to the formation during crystallization of the alloy of a large number of refractory intermetallic compounds, the presence of which leads to the coarsening of the structure, reducing plastic properties and cracking products in the deformation process, which makes it unsuitable for use in products that are produced by stamping, deep drawing.

The known method paucijuga alloy homogenized, and then subjected to preliminary deformation obtained after the deformation of the workpiece rolled with intermediate annealing, and then the resulting intermediate product thermoablative and produce the finished product. For optimum properties as a preliminary deformation of the alloy is subjected to forging, and before forging alloy stand for 3 to 50 hours at 350 - 500oC (homogenized) for the complete dissolution of the magnesium atoms. As the use rolling hot rolling at 350 - 450oC, and then cold rolling with 30 - 50% compression. Thus obtained semi-finished product is subjected to final stabilization at 130oC for 4 h to obtain the finished product.

However, this method is effective for aluminum alloy with a magnesium content of less than 8 wt.%, as the hot rolling of aluminum alloys containing more than 8 wt.% magnesium, leads to rapid decomposition of the supersaturated magnesium solid solution of aluminium. High-temperature heating during the preliminary deformation before rolling leads to intense selection in the structure of the alloy phase of Mg2Al3and coagulation of its particles predominantly along the grain boundaries in a continuous chain that is miroamer semi-finished products and finished products. In addition, the resulting hot-rolled recrystallized structure sheets during subsequent cold deformation, deep drawing leads to the appearance of the lines of Luders.

The present invention is the task to create a way of casting wrought aluminium alloys with a wide interval of crystallization, in particular, aluminum alloys with high magnesium content, providing a uniform distribution in the matrix alloy hardening of dispersed particles (particularly magnesium), suppression of growth and grinding these particles, and grinding dendritic cells grains of solid solution of aluminium, which can significantly reduce dendritic and zonal porosity of aluminium alloys with a wide interval of crystallization and to create wrought aluminium alloy with dispersed structural and chemical homogeneity, with as high of plastic and high strength properties, and create a method of producing products from aluminum alloy with a high content of magnesium, which allows to obtain an intermediate product having a deformability test method Eriksen more than 9.5 mm, in combination with the limit procesales a continuous supply of molten aluminum alloy into the mold, heat removal from the field of liquid metal, processing of liquid metal in the mould of the magnetic field, the crystallization and the formation of the casting, at the same time, according to the invention, the processing liquid metal in the mould carry out a spatially inhomogeneous magnetic field.

Thus, it is expedient processing, magnetic field exercise with the increase of the magnetic induction vector along the crystallization zone in the direction of casting.

Magnetic treatment of the melt according to the invention allows to obtain more dispersed microstructure of the alloy (crushed dendritic cells grains of solid solution of aluminum primary and secondary intermetallic compounds, such as ZrAl3, TiAl3, Mg2Al3and others) enhancing technological plasticity in its subsequent deformation and the improvement of the mechanical properties of the deformed semi-finished products in the production of these products. The most effective specified magnetic treatment when casting alloyed aluminium alloys and alloys with a wide temperature interval of crystallization, in particular aluminum alloys with high magnesium content.

The Priya effective interval of crystallization, that is, reduction in the width of the transition liquid-solid phase, where the structure of the casting. This leads to reduced dendritic and zonal segregation of alloying and impurity components and reduce structural heterogeneity of the ingot. In addition, the use of this magnetic interaction leads to grinding of the intermetallic compounds formed in the alloy during its crystallization, increased solubility is contained in the alloy, the alloying components. The effect of spatially inhomogeneous magnetic field causes a change in the physical properties of the melt, i.e. increases the viscosity of the melt and, depending on the induction changes the coefficients of heat and mass transfer. The imposition of a spatially inhomogeneous magnetic field suppresses the convection of the melt, reduces the fluctuation of the melt temperature and chemical heterogeneity of the casting. This stabilization of the melt increases the temperature gradient, resulting in favorable conditions for the formation of the casting.

In addition, the specified magnetic effect reduces the alloy content of oxide and non-metallic inclusions. This is due to the fact that oxide and nonmetallic inclusions are the result of this is the apparent change in the weights of liquid metal and oxide and non-metallic inclusions and "push" the last of the solidification zone to the upper zone wells ingot, that is, to the surface of the melt, which leads to the refining of liquid metal.

The effect of the use of the spatially inhomogeneous height of the crystallization zone of the magnetic field can be justified as follows.

Crystals of solidified metal have anisotropic physical properties. As a rule, the direction of crystal growth, corresponding to its maximum thermal conductivity, does not coincide with the direction of its growth, the most relevant of its magnetization. During crystallization of the alloy without the use of the proposed magnetic field preferred orientation of the growing crystal is set so that the direction of maximum thermal conductivity coincides with the direction of heat that can increase the speed of crystal growth of intermetallic compounds. This effect leads to the coarsening of the structure and the increasing size of the intermetallic phases.

The imposition of a spatially inhomogeneous magnetic field in the direction of the heat sink causes the physico-mechanical interaction of this field with growing crystals with the rotation of the crystals so that the direction of its maximum magnetized the t does not coincide with the direction of heat dissipation and the rate of crystal growth of intermetallic compounds is slowed down, and they are crushed. At the turn of the crystals under the action of an inhomogeneous magnetic field possible additional effect of grinding crystals of intermetallic compounds associated with their destruction due to the low strength of these crystals at temperatures corresponding to the liquid-solid state melt.

All the above leads to increased simultaneously and strength and plastic properties of alloy cast billets.

Grinding intermetallic inclusions and reduction of dendritic segregation (notidentical and dendritic) can significantly reduce the subsequent homogenizing annealing the ingot. Reduction of time of homogenization allows you to save the supersaturated magnesium solid solution of aluminum, obtained by casting, to reduce secondary porosity in the alloy and to reduce energy costs during annealing.

The non-uniformity of magnetic field induction on the height of the wells hardened metal, i.e., the height of the crystallization zone, provides RunServices around the casting section and equal to the density of the metal. Thus as the highest crystallization rate due to the rapid cooling is provided in the zone of intersection of the branches of the isotherms whether the surveillance zone of the liquid - solid phase alloy magnetic induction of the field should grow, therefore, the processing of the magnetic field it is advisable to move the maximum value of the magnetic induction near the top of the isotherms of liquids, where the lowest rate of nucleation and crystal growth.

Processing the magnetic field should preferably be conducted with increasing magnetic induction vector along the crystallization zone from (from 0.04 to 0.63) $ (0,051 - 0.64 in) TL.

Thus it is established experimentally that the effective interval between the minimum magnetic field induction and the maximum induction is not less than 0.01 Tesla, as in this case, when the interaction of moving melt with inhomogeneous magnetic field in the melt, an electric current sufficient for a significant impact on the convective heat flow of liquid metal, the increase in melt viscosity and the coefficients of heat and mass transfer.

Thus, it is expedient processing to perform pulsed magnetic field with the same time the direction of the vector of magnetic induction, the value of which increases from (from 0.04 to 0.39) $ (0,05 - 0,40) TL.

The effect of pulsed magnetic field is the additional grinding grains of solid solution of aluminum for the intensive breaking of branches of dendrites and refinement of the structure of the casting. The use of the pulsed magnetic field is most useful when casting small and medium cross sections when the mold is relatively small quantity of the melt, and when the alloy contains a limited number of modifiers, such as titanium and boron.

Preferably the treatment is to make the magnetic field with time-varying vector direction of the magnetic induction on the opposite while increasing its value in the crystallization zone from (from 0.04 to 0.39) $ (0,05 - 0,40) TL.

The application of this alternating field is most useful when casting having a large cross-section, i.e., when the mould is a large amount of melt. The alternating magnetic field and a pulsed magnetic field, optionally milled grain solid solution of aluminum due to dynamic effects. In addition, the application of the alternating magnetic field in a greater degree reduces the zonal porosity of magnesium due to the oscillatory process that improves the deformability of the alloy at all stages of its subsequent redistribution.

The application of the proposed pulsed and alternating prostranstve ascending and falling of the magnetic flux in the alloy having a more strong induced electric currents, this increases the interaction flow of melt and crystals of solidified metal with the magnetic field. Creates a dynamic effect on the whole front solidification of the casting.

The task is also solved by the creation of an alloy based on aluminum, obtained mainly by the method described above, and optionally containing magnesium, zirconium, beryllium, titanium in the following ratio, wt.%:

Magnesium - 9,5 - 11,5

Zirconia - 0,05 - 0,2

Beryllium - 0,03 - 0,15

Titanium - 0,02 - 0,1

Aluminum - Rest

this alloy has a dense homogeneous structure with evenly distributed in the matrix particles, the dispersion of which is from 5000 to 20000 .

We offer aluminum-magnesium alloy has high strength, high ductility, high corrosion resistance and low specific gravity. This semi-finished products made of this alloy have a high plastic, mechanical properties, deformation and stampability, which enable the production of these items using the deep drawing, including body parts of cars.

The presence of magnesium within the specified limits provides increased prey.

If magnesium is less than 9.5 wt.%, the resulting solid solution of aluminium in its structure will not contain enough magnesium to ensure the specified mechanical properties. Increase magnesium above 11.5 wt. % leads to the formation of unstable solid solution of aluminum in which the subsequent process heating and deformation of intense selection and coagulation fragile - phase Mg2Al3that reduces the strength, ductility and corrosion resistance of semi-finished products.

The introduction of zirconium within the specified limits in the proposed composition of the alloy stabilizes and strengthens the solid solution of aluminium. Introduction Zirconia is below 0.05 wt.% not enough to stabilize and harden solid solution of aluminium. The zirconium content above 0.2 wt.% leads to gross allotments acicular intermetallic phase ZrAl3reducing plasticity and efficacy of this component in the alloy.

Beryllium is introduced into the alloy to protect the magnesium from oxidation. Within these limits beryllium performs the function of protection of magnesium from oxidation. When the decline will not be provided with adequate protection and increase of its concentration above decree is to modifier to improve the processability of the alloy during casting and improve the manufacturability of solid solutions -aluminum during deformation. At the same time it is a barrier to the formation of brittle intermetallic phases of Mg2Al3. Introduction titanium is lower than 0.02 wt.% not enough to modification of the alloy, and the introduction above 0.1 wt.% leads to the separation of titanium aluminides having a rough shape, which reduces the efficiency of its use.

It is advisable to aluminum alloy additionally contains from 0.01 to 0.05 wt% of cobalt. Cobalt, which is the element with the smaller atomic radius compared with magnesium and zirconium, reduces the lattice parameter of the aluminum increases the stability of the solid solution of aluminum and workability of the alloy during rolling. Together with zirconium, cobalt has a positive effect on strength and plastic properties of the proposed alloy. The introduction of cobalt below 0.01% is sufficient to achieve the specified positive effect, and the introduction of it is above 0.05% leads to the selection of cobalt aluminides and reduce its positive impact, because the solubility of cobalt at room temperature corresponds to approximately 0.02%, but his biggest impact will be when it is in solid solution of aluminum in the form of atoms, uniformly embedded in kristallicheskoi the limits entered in the alloy to enhance the modifying influence of titanium on grain - -aluminum. Preferably boron in ratio to the titanium as 1 : 5. In this case, their joint effect is most effective. Therefore, the lower limit is limited by the limit of 0.004 wt.%, and the top of 0.02 wt. %. Further increase may cause the allocation of crystallization of the alloy of a large number of aluminides of boron and deterioration of the processability of the alloy during rolling.

It is desirable that the aluminum alloy additionally contains 0.01 to 0.3 wt. % chromium. Chrome introduced in the composition of the alloy as element intercrystalline, which together with Zirconia increases the stability of the solid solution of aluminum and improves, thus, the strength properties of the alloy.

Reducing the chromium content less than 0.01 wt.% not enhancing the recrystallization temperature of the alloy, which reduces its strength properties. Increasing the chromium content above 0.3 wt.% leads to the formation of the alloy structure of the refractory intermetallics Cr2Al3that worsen its deformability.

Thus, the proposed alloy in combination with the proposed casting method allows to obtain a special fine-grained structure castings with enhanced strength and plastic properties, provided is the use of the method of production of intermediate products from an alloy based on aluminum, including homogenization casting, pre-deformation of the casting, rolling of the thus obtained preform with intermediate annealing, heat treatment of the obtained semi-finished product and manufacture of the intermediate product, in this case, according to the invention, the pre-deformation and rolling is carried out at a temperature not exceeding the temperature stability of magnesium in a solid solution of aluminum and the heat treatment of semi-finished product is carried out by quenching.

The proposed method allows the use of low temperature deformation. This leads to the reduction of the decomposition of solid solution of aluminum to limit the release of fragile - phase Mg2Al3and reducing the recrystallization process that allows to obtain products (intermediate) with fine-grained Polynesians structure with high strength, plastic properties and high corrosion resistance.

As a preliminary deformation, it is advisable to carry out the extrusion at a temperature not exceeding 350oC, which allows to obtain extruded semi-finished product with precrystallization structure with a high level of strength and plastic properties for further use is risovaniya is the temperature barrier for separation and coagulation - phase of Mg2Al3that is a positive for the proposed alloy with a high concentration of magnesium.

Rolling should be performed at a temperature not exceeding 350oC, which allows you to save precrystallization the structure of the intermediate products with dispersed - phase Mg2Al3uniformly distributed over the volume of the alloy, and to obtain the intermediate product with high strength properties and good formiruemoyu after their heat treatment.

Hardening of the semifinished product is useful to 380 - 435oC.

Production of rolled intermediate product from the proposed aluminium alloy with a high concentration of magnesium allows to exclude from the process flowsheet very poor high-temperature heating during the preliminary deformation and rolling.

Thus, the use of the proposed method of casting aluminum alloys, we offer aluminum alloy with a high content of magnesium and the proposed method of producing therefrom intermediate products can significantly reduce notidentical and dendritic porosity, chop dendritic cells grains of solid solution of aluminum, ismale to improve plastic properties and deformability of products from aluminum alloys with high magnesium content, while preserving their high strength properties. Thus obtained intermediate product with ultimate tensile strength higher than 370 MPa with simultaneous deformation in a cold state by Eriksen more than 9.5 mm and having a dense homogeneous crystalline structure with evenly distributed in the matrix particles with a particle size from 5000 to 20000 .

The best variant embodiment of the invention.

Take aluminum alloy containing the following components, wt%:

Magnesium - 9,5 - 11,5

Zirconia - 0,05 - 0,2

Beryllium - 0,03 - 0,15

Titanium - 0,02 - 0,1

Aluminum - Rest

This alloy may contain:

Cobalt in an amount of 0.01 to 0.05 wt.%

Chromium in an amount of 0.01 to 0.3 wt.% and

Boron in an amount of 0.004 - 0.02 wt.%, taken separately or in combination.

Pre-heat the alloy to a temperature of, for example 750oC. the Molten aluminum alloy Tegaserod, subjected to filtration and then continuously fed into the mold, where they perform a continuous heat dissipation, for example, cooling water. To enhance the cooling process, the coolant also serves on the lateral surface of the casting to release it from the mould.

In the process of crystallization of the alloy podrodom, covering the mold or molds, and as the magnetic field using spatially inhomogeneous height of the crystallization zone of the magnetic field, the magnetic induction vector of which increase the height of the crystallization zone in the direction of the top of the liquidus isotherm, i.e. in the direction of casting.

Specified magnetic induction to create, for example, by structural embodiment of the coil of the solenoid with the changing density of its winding. You can use a coil made from separate sections of different densities coil to increase the magnetic field gradient in a given direction.

Using the specified magnetic field producing dendritic cells solid solution of aluminum and primary crystals, increases their homogeneity. With increasing magnetic field the effect of grinding increases, while the eutectic evenly distributed fine spatial mesh around grains of solid solution of aluminum To achieve the best results, it is advisable maximal induction support in the area of the top of the liquidus isotherm, i.e. the maximum width of the transition liquid - telemental installed, what is the difference between the minimum and maximum induction shall be not less than 0.01 Tesla.

The use of spatially inhomogeneous magnetic field allows you to create in the transition zone (liquid-solid phase) pressure on the liquid metal, due to which there appear additional branches of the dendrites of higher order, in the process of crystallization increases the rate of hardening, reduced diffusion of alloying elements on grain boundaries (separating diffusion), which leads to the formation of a dense homogeneous crystalline structure with evenly distributed in the matrix of the alloy particles, the dispersion of which is 5000 - 20000 .

Obtain castings with the above structure allows further deform the alloy in the region of low temperatures, which makes it possible to produce products having polygonizing structure in precrystallization condition.

It is advisable to use a spatially inhomogeneous magnetic field, the magnetic induction vector of which increase the height of the crystallization zone from (from 0.04 to 0.63) $ (0.05 to 0.64 in) TL. When this occurs ponderomotive effect surround Elektromagnitnye, the speed of chemical reactions, the formation of eutectic and intermetallic compounds. Is the apparent change in state diagrams (pseudodiaptomus) and increases the solubility of magnesium in aluminum. Moreover, magnesium is uniformly dissolved in the aluminum and alloying additives and formed of dispersed intermetallic compounds will do the atoms of magnesium is less mobile and will fix them in the matrix solid solution of aluminium.

As the magnetic field can be used pulsed magnetic field constant in time direction vector of the magnetic induction or the alternating magnetic field with time-varying vector direction of the magnetic induction on the opposite, for best effect, it is advisable to magnetic induction vector of these magnetic fields to increase the height of the crystallization zone from (from 0.04 to 0.39) $ (0,05 - 0,40) TL.

When exposed to the melt specified unidirectional pulsed magnetic field or a specified alternating magnetic field due to the dynamic impact is more intense breaking of branches of dendrites growing crystals and fragmentation of primary interm the data pulse magnetic field and the alternating magnetic field can be achieved by power control coil of the solenoid.

Next, the ingot is homogenized, for example, at 420oC in the furnace of homogenization, for example, within 4 hours

Homogenized ingot is extruded, for example, by a hydraulic press at 350oC and below, i.e., below the temperature stability of magnesium in a solid solution of aluminum during deformation.

The upper limit of the temperature is limited by the need to reduce the decomposition of solid solution of aluminum and limit the processes of recrystallization of the alloy, i.e. to get the pressed strip in precrystallization condition with Polynesians structure.

Next, the strip is subjected to heating and rolled at 350oC or lower to the desired thickness, for example 1.0 mm, with intermediate annealing at a temperature of 227 - 360oC. increasing the temperature above 350oC can lead to intense recrystallization grains of solid solution of aluminum and over allocation - phase Mg2Al3a continuous chain along the grain boundaries, which reduces the strength, ductility and corrosion resistance bands and derived from these sheets.

The sheets are subjected to heat treatment at 380 - 435oC followed by cooling, for example, in water at 20 - 100oC or in oil at 20o2Al3and enter her in a solid solution of aluminum. This allows to obtain products at the same time with high strength and plastic properties and high corrosion resistance.

Reducing the quenching temperature below 380oC may not allow to fully dissolve specified - phase, and increase the quenching temperature above 435oC can lead to melting of low-melting eutectic and reduce mechanical properties.

The sheets after the heat treatment is subjected to editing, for example, on a roller machine to obtain the finished product.

Thus, the use of the proposed method of casting, we offer aluminum alloy and the proposed method of production of a product allows the product (intermediate), such as strips, sheets, profiles, rods, tubes and the like having high technological properties during subsequent deep drawing (deformability in a cold condition when tested by the method of Eriksen more than 9.5 mm), high strength (ultimate tensile strength of more than 370 MPa), high rigidity, low specific weight, high corrosion resistance, i.e., these products have svoistva invention provides specific examples of its implementation.

Example 1. Take aluminum-magnesium alloy containing the following components, wt%:

Magnesium - 10,5

Zirconia - 0,11

Cobalt - 0.02

Chrome - 0,05

Beryllium - 0,08

Titanium - 0.02

Bor - 0,0036

Aluminum - Rest

Alloy smelted in an electric furnace.

Preheated to 750oC above the alloy Tegaserod, then subjected to filtration on the path of feed of the melt from the furnace to the mold.

Casting is carried out on machines continuous casting in molds slip of any shape (round, square, rectangular), made of nanomagnetics materials, such as aluminum, copper or graphite.

In the process of continuously casting heat removal by the water supply, for example, on the wall of the mold and the surface of the casting to release it from the mould.

The melt in the mold is exposed to a spatially inhomogeneous magnetic field created by the solenoid, covering the mold. The solenoid is fed, for example, from the power supply, which feeds the coil of the solenoid voltage required amplitude and shape. The vector magnetic livki.

Maximal induction of inhomogeneous magnetic field of 0.25 T) is supported near the top of the liquidus isotherm, which is determined by the depth of the wells on the boundary of liquid and liquid-solid phases of the casting.

Minimum induction inhomogeneous magnetic field (0,1257 T) create a level crossing branches of the isotherm the liquidus and solidus, i.e., in the upper zone wells casting. The difference in the level of magnetic field induction on the height of the crystallization zone is 0,1257 T.

The resulting casting homogenized at a temperature of 420oC for 4 hours in an oven homogenization. After homogenization it is pressed on a hydraulic press at 350oC on the strip. Then the pressed strip rolled on a rolling mill at 310oC to a thickness of 1 mm with one intermediate annealing at 270 - 330oC.

The sheets are subjected to heat treatment at 380oC, after which they are ready to produce, for example, the body parts of cars and other vehicles, the production of which use operation deep drawing.

The following ten examples (examples 2 to 12 is similar to that described in example 1, are summarized in table. 1.

In table. 2 illustrates the properties if the SNO invention.

For comparison, in example 13 shows the mechanical properties of the sheet thickness 1,0 mm alloy system aluminum-magnesium, containing the following components, wt. %: magnesium 4,8; manganese 0,50; chrome 0,10; titanium 0,10; silicon 0,20; iron 0,35; copper 0,15; zinc; 0,20; aluminum - the rest is used for panels of car bodies a number of companies;

In example 14 shows the mechanical properties are similar to the sheets of the alloy (prototype) system aluminum-magnesium, containing the following components, wt.%: magnesium 7,4; zirconium 0,50; manganese 0,50; cobalt 0,10; Bor 0,10; titanium 0,10; zinc; 0,30; beryllium 0.05, the aluminum - rest.

In example 15 shows the mechanical properties are similar to the sheets of steel grade ST(f) THE 14-1-3764-84 used for the manufacture of car bodies of plants "AVTOVAZ ", "Moskvich ".

As follows from the above tables, we offer alloy, the method of molding and method of producing therefrom intermediate products allow to obtain a material with mechanical properties that correspond to the steel, but about three times lighter than her. This material has a high plasticity in cold condition necessary for obtaining variety of stamped using the deep drawing elemementary currently in the automotive industry foreign firms.

1. Method of casting aluminum alloy, comprising a continuous supply of molten aluminum alloy into the mold, the heat from the field of liquid metal, processing of liquid metal in the mould of the magnetic field, the crystallization and the formation of casting, characterized in that the processing of liquid metal in the mould carry out repeated spatial magnetic field.

2. The method according to p. 1, wherein processing the magnetic field is performed with the increase of the magnetic induction vector along the crystallization zone in the direction of casting.

3. The method according to p. 1, wherein processing the magnetic field is performed with the guidance of the maximum value of magnetic induction near the top of the liquidus isotherm.

4. The method according to p. 1, wherein processing the magnetic field exercise with increasing magnetic induction vector along the crystallization zone from (from 0.04 to 0.63) $ (0.05 to 0.64 in) TL.

5. The method according to p. 4, wherein processing the magnetic field exercise with increasing magnetic induction vector along the crystallization zone by 0.01 or more T.

6. The method according to p. 5, characterized in that the treatment is carried out magnetic polemo p. 5, characterized in that the treatment is carried out by a pulsed magnetic field with a constant time by the direction of the magnetic induction vector.

8. The method according to p. 6 or 7, characterized in that the processing of magnetic field exercise with increasing magnetic induction vector in the crystallization zone from (from 0.04 to 0.39) $ (0,05-0,40) TL.

9. Alloy based on aluminum, characterized in that it is made by a molding method according to any one of paragraphs.1 - 8.

10. Alloy under item 9, characterized in that it additionally contains magnesium, zirconium, beryllium, titanium in the following ratio, wt.%:

Magnesium - 9,5 - 11,5

Zirconia - 0,05 - 0,2

Beryllium - 0,03 - 0,15

Titanium - 0,02 - 0,1

Aluminum - Rest

this alloy has a dense homogeneous crystalline structure with evenly distributed in the matrix particles with a particle size from 5000 to 200000 .

11. Rafting on p. 10, characterized in that it additionally contains from 0.01 to 0.05 wt.% cobalt.

12. The alloy according to any one of paragraphs.10 and 11, characterized in that it further comprises of 0.004 - 0.02 wt.% Bora.

13. The alloy according to any one of paragraphs.10 to 12, characterized in that it additionally contains 0.01 to 0.3 wt.% chrome.

14. Method for the production of intermediate isolatio casting, rolling thus obtained preform with intermediate annealing, heat treatment of the obtained semi-finished product and the manufacture of intermediate products, characterized in that the pre-deformation and rolling is carried out at a temperature not exceeding the temperature stability of magnesium in a solid solution of aluminum and the heat treatment of semi-finished product is carried out by quenching.

15. The method according to p. 14, characterized in that as a pre-deformation carry out the extrusion at a temperature not exceeding 350oC.

16. The method according to p. 14, wherein the rolling is carried out at a temperature not exceeding 350oC.

17. The method according to p. 14, characterized in that the hardening of the semi-finished product is carried out at 380 - 435oC.

18. The intermediate product from an alloy based on aluminum containing magnesium, zirconium, beryllium, titanium, characterized in that it has a tensile strength for more than MP and deformability in a cold state by Eriksen more than 9.5 mm and made of an alloy containing components in the following ratio, wt.%:

Magnesium - 9,5 - 11,5

Zirconia - 0,05 - 0,2

Beryllium - 0,03 - 0,15

Titanium - 0,02 - 0,1

Aluminum - Rest

19. is suspended in the matrix particles with a particle size from 5000 to 20000 and molded according to the method, includes the following stages: a continuous supply of molten alloy in the crystallization zone; continuous heat removal from the field of liquid metal with its subsequent crystallization and the formation of castings; processing of liquid metal in the zone of crystallization spatially inhomogeneous field, the magnetic induction vector of which increase along the crystallization zone in the direction of casting.

20. The product under item 19, characterized in that it is obtained by the method comprising the following steps: homogenization casting; pressing olives at a temperature not exceeding 350oC; rolling deformed billet at a temperature not exceeding 350oC; hardening of rolled semi-finished product at 380 - 435oC.

21. The product under item 18, characterized in that the alloy additionally containing together or separately, wt.%: cobalt, 0.01 to 0.05, 0.004 percent boron - 0.3 and chrome 0.01 to 0.3.

 

Same patents:

The invention relates to metallurgy, in particular to methods for semi-finished products of aluminium-magnesium alloys

The invention relates to the metallurgy of non-ferrous alloys, namely to thermomechanical processing plates of alloys of the system Al-Mg-Zi-SC, and can be used in metallurgical and machine-building plants

The invention relates to a method of making welded joints of the alloy system aluminum-magnesium-lithium and can be used in the process of production of welded parts aircraft, new technology and other industries

The invention relates to the field of foundry alloy based on aluminum

The invention relates to the field of metallurgy alloys, in particular thermally deformable neurocinema alloys intended for use in the form of deformed semi-finished products as a structural material

The invention relates to metal alloys, in particular thermally deformable neurocinema alloys intended for use in the form of deformed semi-finished products as a structural material

The invention relates to the field of metallurgy alloys, in particular wrought alloys intended for use in the form of a welding wire as a filler material for fusion welding

The invention relates to the field of metallurgy alloys, in particular thermally deformable neurocinema alloys intended for use in the form of deformed semi-finished products as a structural material

The invention relates to the field of metallurgy alloys, in particular thermally deformable neurocinema alloys intended for use in the form of deformed semi-finished products as a structural material

Aluminum alloy // 2081933
The invention relates to the field of metallurgy of non-ferrous metals, namely to the development of thermally neurocinema, welded, rigid, corrosion-resistant aluminum alloy system aluminum-magnesium-scandium to work as a structural material in the production of the corresponding purpose, elements, details of which are working temperature - 196oC

The invention relates to alloys based on aluminium, designed for use as a structural material

The invention relates to deformable aluminum alloys and can be used in metallurgy and mechanical engineering, in particular in the shipbuilding and aircraft industries

The invention relates to the field of mechanical engineering, mainly electronic and can be used in the production of substrates on the basis of aluminum for magnetic recording media

Filling device // 2111825
The invention relates to a filling device for continuous or semi-continuous casting of metal with direct cooling, in particular casting billet aluminum for subsequent rolling

The invention relates to metallurgy, and is intended for continuous metal casting Mold includes a housing and copper workers walls with slotted channels for cooling water between each of the working panel and the body of the mold is set, the intermediate element can be mounted with one side on the body of the mold and fixing on the opposite side of the copper working wall

The invention relates to metallurgy and is designed to produce continuously cast billets

The invention relates to metallurgy and is aimed at creating high-performance process of obtaining a continuously cast billets

The invention relates to a method of manufacturing the wide side of the mold device for continuous casting, which has extending from the upper edge and extending to the sides and bottom area

The invention relates to metallurgy, and more particularly to the continuous casting of metals

The invention relates to the field of metallurgy, can be used in the installation of steel casting in preparation for the mould

The invention relates to metallurgy and can be used in the casting of ingots of metals and alloys, mainly aluminum, semi-continuous method
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