Method of making foil from titanium-based intermetallide orthoalloys

FIELD: process engineering.

SUBSTANCE: proposed method comprises making ingots or powder billets. The latter are subjected to hot thermo mechanical machining, including sandwich rolling and finish cold rolling. Foil material mechanical properties are stabilised and material structure is blended in sandwich rolling at semi-finished rolled stock thickness of 2-4 mm with premade fine structure wherein grain width does not exceed 10 mcm while its length makes 40 mcm. Sandwich is composed of a set of semi-finished rolled billet and two steel covering plates. Note here that top covering plate thickness is 1.4-1.8 times larger than that of bottom plate. Hot rolling of sandwich is started from 950±50°C in several passes with total deformation of 70-90%. After annealing at 920±70°C and sandwich disassembly, cold rolling of every billet is performed at total deformation of 40-70% with intermediate vacuum annealing at 920±70°C.

EFFECT: higher foil quality made from titanium aluminide-based alloys based on Ti2AlNb orthorhombic phase.

2 cl, 4 dwg, 2 tbl

 

The invention relates to the field of metal forming, and in particular to methods of manufacturing foil cold rolling of alloys based on titanium aluminides (intermetallic titanium alloys), based on the orthorhombic phase of Ti2AlNb.

Currently, the most widespread manufacturer of foil industrial methods received the following technologies:

- rolling intermetallic billets produced from ingots or powder blanks;

- vacuum deposition of intermetallic alloys on a substrate with subsequent removal;

- vacuum process, in combination with the rolling of the deposited material.

Most high quality foil with stable properties is technology rolling, but for a foil thickness of 0.1 mm or less require additional electrolytic processing.

Known intermetallic compounds on the basis of Ti and Al, titanium aluminides (γ+α2-alloys)with high melting point, low density, high elastic moduli, oxidation resistance and fire, high strength/density and heat resistance. The scope of these compounds is extensive and includes: engine components, rocket nozzles, elements of a covering space vehicles, cell design sverhzvukovoy the x aircraft and the elements of their heat systems.

However, γ+α2the alloys have considerable disadvantages: low ductility at room temperature (hard deformiruem. during cold rolling), low viscosity, good enough fatigue properties, relatively high growth rate of cracks, possible porosity specific heat treatment.

More promising is a two-phase intermetallic alloy based on titanium with the addition of niobium, about or more than 25%, (ERCOSPLAN), for example an alloy based on Ti2AlNb, containing more ductile at room temperature β-phase, which includes an ordered orthorhombic crystal structure of ortho (O)-phase and three-centered cubic structure (BCC) phase of (β, or B2) and less plastic (alpha-2)-phase (α2). The alloy has a good combination of high temperature strength, sufficient ductility at room temperature and fracture toughness.

There is a method of rolling of billets from zaevtektoidnyh γ+α2-alloys, which relates to the handling of alloys based on titanium aluminides TiAl (γ-phase) and Ti3Al (α2-phase)obtained by casting or by powder metallurgy. The method involves rolling the original piece with a pre-prepared fine-grained structure on the sheet or foil with a predetermined thickness and grain size,which is carried out in a given interval of strain rates and temperatures for one or more stages, undertaken, in turn, for N passes in isothermal or kvazistaticheskikh conditions. The technical result of the invention to provide a sheet and foil with controlled structure and preparation of fine-grained microstructure in the initial preparations for implementing the method of rolling (RF patent No. 2164180, IPC B21B 3/00, C22F 1/18).

The disadvantages of this method are the limited size of the produced semi-finished product, the method inefficient, labour-intensive and adapted for the production of titanium aluminides.

A known method of manufacturing subjected to cold working of products from metal alloy (options). The invention relates to the manufacture of metal products, in particular, difficult intermetallic alloys. The product is made from iron aluminides, Nickel or titanium. When cold worked product is subjected to work hardening. Is rapid annealing aged less than one minute. Operation cold work and fast annealing may be repeated to obtain the required dimensions. The product can be obtained by casting, powder metallurgy or by plasma sputtering (RF patent 2245760, IPC B22F 3/24, C21D 7/02, C22F 1/18).

The method requires special equipment and does not guarantee the obtaining of products with stable mechanical properties homogenous structure.

A known method of manufacturing sheets of hard multicomponent alloys comprising melting the alloy, casting ingots, hot and cold rolling of ingots up to a given size of sheet and annealing, while the hot rolling of ingots produced with a surface oxide film in the case in crowded environments quenching and cold rolling are fractionally with advanced and intermediate Sakagami, while hot rolling and intermediate heat treatment before Sakagami produced in the temperature range below the melting point of the fusible component and higher than the temperature of dissolution of hardening phases. The method allows to obtain a wide range of products with stable mechanical and chemical properties consisting of multicomponent alloys belonging to the class of precipitation hardening and including a low-melting components (RF patent No. 2382685, IPC B21B 3/00) prototype.

This method cannot be applied in the manufacture of sheet products of intermetallic alloys, because it does not take into account the specificity of phase transformations during thermomechanical processing of intermetallic ortolano.

Task to be solved by the claimed invention is directed, is to obtain the standard equipment of high quality foil of the intermetallic arespl the great Patriotic war on the basis of titanium, in particular, based on the orthorhombic phase of Ti2AlNb used in aerospace systems.

The technical result of the invention to provide a method of manufacturing a foil thickness of 0.1 mm and less cold rolling, which allows you to get out of intermetallic ortolano quality foil with stable mechanical properties and a homogeneous structure.

The technical result is achieved in that in the method of manufacturing a foil of intermetallic of ortolano based on titanium., including the production of ingots or powder blanks, which are then subjected to hot thermomechanical processing, including batch rolling, and final cold rolling, batch rolling is carried out at a thickness of strips equal to 2-4 mm with pre-prepared fine-grained structure in which the width of the β-grains is not more than 10 μm, and the length is 40 μm, the package is formed by a set of billet steel and two steel plates, the thickness of the upper mantle 1.4-1.8 times more than the bottom, the hot rolling of a package made from the set heating temperature of 950±50°C for several passes with a total degree of deformation 70-90%, after annealing at a temperature of 920±70°C and disassembly of package cold rolling of each workpiece lead with a total degree of deformation of 40-70% with intermediate vacuum is passed by annealing at a temperature of 920±70°C.

The invention is illustrated by illustrations, where:

1 shows a foil thickness of 80 μm, the obtained alloy Ti-10,5Al-39,5Nb-1,2Zr-1,3V-0,7Mo-0,16Si (weight percent).

Figure 2 shows the microstructure of the steel after batch rolling.

Figure 3 shows the microstructure of the foil obtained for the two stages of cold rolling.

Figure 4 shows a scheme of the receipt foil of alloy Ti-10,5Al-39,5Nb-1,2Zr-1,3V-0,7Mo-0,16Si (weight percent).

The invention

Intermetallic compounds occupy an intermediate place between metals and ceramique types of chemical bonding, and properties. Included in the intermetallic artsplay compounds have a chemical bond as metal type, and with some degree of covalent component. So they have a much better machinability than ceramics. At elevated temperatures, there is disorder and ductility increases. This property allows for the fixation of high-temperature state to give the alloys a framework that allows us to expose them to cold rolling.

For cold rolling should:

- formation in these alloys before cold rolling of a homogeneous fine-grained equiaxial microstructure;

- the application of methods and modes of rolling, which would provide a uniform expansion in the procurement of plastic deformation was prepyatstvovali its localization.

Technologically structure similar material make suitable for cold rolling through recrystallization processes and phase transformations initiated during high-temperature plastic deformation due to the introduced into the material energy stress. The fineness and uniformity occurs after plastic deformation patterns vary along with the temperature and speed of formation primarily on the schema effort.

When the concentration of the deforming forces on a limited area of plastic deformation imposed by the material energy stress) on the periphery of the deformable products appear high secondary tensile stresses, which creates the conditions for propagation. The application of hot batch before rolling cold rolling to allow these technical contradictions, namely to obtain the desired structure before cold rolling, without destruction of the workpiece.

Tackle for batch rolling is performed by known methods thermomechanical hot, the thickness of the rolled 2-4 mm, provided that the alloy structure to form grain β-phase of a width not exceeding 10 μm and a length of not more than 40 μm. A batch is formed by rolling the alloy structure, allowing to carry out cold rolling of billets.

Batch rolling ASU is estlat in the package which is formed by a set of billet steel and two steel plates, the thickness of the upper mantle 1.4-1.8 times lower.

Applied the difference in the thickness of the plates provides additional shear strain. This asymmetry in the deformation zone aligns efforts in the hearth and is a stabilizing factor for sustainable process batch rolling and negates the possibility of the formation of local koralawella in titanium billets, practically excludes them joining in the presence between them of the separation layer.

Batch rolling is performed at the installation temperature of 950±50°C for several passes with a total degree of deformation of 70-90% with subsequent annealing at a temperature of 920±70°C. the Conditions of thermomechanical processing of selected empirically, when introduced into the workpiece thermomechanical energy allows you to get in the alloy of homogeneous fine-grained equiaxial microstructure prepared for cold rolling.

Then, the packet is parsed and further cold rolling of each workpiece for several stages with a total degree of deformation at each stage of 40-70% with intermediate vacuum annealing at a temperature of 920±70°C. the Deformation of less than 40% is not advantageous for economic reasons, with the deformation of more than 70% probably formed the e cracks. Annealing in the temperature range of 920±70°C is guaranteed to relieve work hardening and does not increase grain.

The proposed method provides the possibility of obtaining foil of thickness less than 0.1 mm of the intermetallic of ortolano titanium-based.

For assay of the present invention was used based alloy intermetallic Ti2AlNb. The chemical composition of the alloy is given in table 1.

Table 1
Ti %Al, %The content of alloying elements, % (weight percent)
NbZrVMoSi
Base10,539,51,21,30,70,16

The ingot melting was melted double vacuum arc refining sizes Ø190×(200...250) mm Temperature of polymorphic transformation of the alloy determined by the method of trial sakaluk amounted to (990±5)°C. From multiple ingot forging in the β-region were fabricated slabs 40×440 is L mm, from which, by means of rolling in the β-region were made tackles thickness of 3.5±0.5 mm Then was cut into pieces for batch rolling size of 3.0×130×120 mm After polishing the workpiece been picked for batch rolling. In the package was put on 3 of the workpiece. Plates prepared from steel st3sp sizes:

- the top 14×200×200 mm,

- the bottom 10×200×200 mm

Welding packages was carried out on three sides, the rear end was left open.

Hot rolling (SE) packages from the installation of a heating temperature of 950°C was carried out on non-reversing two-high mill (roll diameter 500 mm) with a total degree of deformation of 75% to the thickness of the workpieces to 0.7 mm, Annealing was carried out in a conventional furnace at a temperature of 950°C, the duration of the annealing 20 minutes

Figure 2 is given metallographic image of the obtained sheet. In the structure (figa) observed the initial allocation, which are both globular and lamellar form. When this plate selection is oriented along the direction of deformation. The main share of the allocations has a globular shape with a size of about 0.5 to 1.0 microns.

According figb sample has a fine-grained structure with an average size of β-grains of 5 μm. The initial allocation, mainly situated on the frontiers. The actual boundaries are not straight, the shape of the grains ne is ka to equiaxial, that can be explained by the dynamic processes/postgenomics recrystallization occurring during hot deformation or during subsequent cooling.

After disassembly of the package and finishing operations billets were subjected to cold rolling according to the following scheme.

The first cold rolling hot rolled billets on Selivanova mill with a degree of deformation of 60% (CP 1).

Soothing heat treatment in a vacuum furnace at a temperature of 870°C.

The second cold rolling (CP 2) Selivanova mill with a degree of deformation of 60% on the final thickness of 80 μm.

Scheme for foil, including batch rolling and cold rolling, shown in figure 4.

The microstructure of the foil after the second cold rolling is presented in figure 3.

Cold deformation leads to a change in the shape of the grains of the β-phase, which continue to extend along the direction of rolling. Changes in the structure of the primary discharge is not detected. Secondary allocation O-phase partially reoriented in the direction of rolling. Next, the foil was subjected to different heat treatment regimes.

The mechanical properties of the foil thickness of 80 μm after different modes of heat treatment are presented in table 2.

Table 2
The mode of annealing in the vacuumMechanical properties
furnaceσin, MPaδ, %
Heating at 750°C, exposure 2 h, cooled with oven12000,5
Heating at 800°C, exposure 2 h, cooled with oven11500,99
Heating at 900°C, exposure 2 h, cooled with oven11001,5
Heating at 950°C, exposure 2 h, cooled with oven10202,5

The method allows to produce a foil made of alloys based on Ti2AlNb with low technological plasticity, in extremely cold deformation methods (rolling) to a thickness less than 0.1 mm

A method of manufacturing a foil of intermetallic of ortolano on the basis of titanium, including the production of ingots or powder blanks, hot thermomechanical processing, including batch rolling, and final cold rolling, characterized in that batch rolling conduct PR is the thickness of the strips, equal to 2-4 mm, with pre-prepared fine-grained structure in which the width of the β-grains is not more than 10 μm, and the length is 40 μm, the package is formed by a set of billet steel and two steel plates with the thickness of the upper mantle, 1.4-1.8 times thicker bottom, produce hot-rolling of the package from the installation of the heating temperature (950±50)°C for several passes with a total degree of deformation of 70-90%, annealing at a temperature (920±70)°C and disassembly of the package, and then cold rolling of each workpiece with a total degree of deformation 40-70% with intermediate vacuum annealing at a temperature (920±70)°C.



 

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