Titanium-base alloy

FIELD: metallurgy.

SUBSTANCE: invention relates to titanium-base alloys used in making high-strength and high-efficient articles. Titanium-base alloy consists of aluminum, vanadium, molybdenum, iron and oxygen. Components of alloy are taken in the following ratio, wt.-%: aluminum, 3.5-4.4; vanadium, 2.0-4.0; molybdenum, 0.1-0.8; iron, max 0.4; oxygen, max 0.25, and titanium, the balance. Invention provides the development of universal alloy for large-sized forged pieces and stamps, thin-sheet roll and foil possessing the necessary strength and plastic indices and structure.

EFFECT: improved and valuable properties of alloy.

2 tbl

 

The invention relates to the field of metallurgy, namely the creation of a modern titanium alloys used for manufacturing high-strength and high-tech products, including large, i.e. alloys having a high degree of flexibility.

Titanium alloys are widely used as materials in aerospace, for example, for aircraft and missiles, because the alloys have strong mechanical properties and are relatively lightweight.

Known most widely used titanium alloy Ti6A14V (Kalachev B.A., Polkin I.S. and Talalaev E Titanium alloys in different countries. The Handbook. M: VILS, 2000, p.58-59) - [1]. The alloy was developed in the USA in the 50-ies. Alloy average strength from 850 to 1000 MPa and high technology. Well handled pressure: forging, stamping, pressing. Widely used in aviation and aerospace, shipbuilding, automotive, and others, as well as the manufacture of fasteners for various purposes. The alloy is well handled by all types of welding, including diffusion.

Lack of Ti6A14V alloy is its lack of versatility. From it is difficult to manufacture a painted steel sheet, foil, tube, since the alloy has a relatively high resistance to deformation at temperatures of deformation is below 800° C leads to the formation of defects such as cracks, and also shortens the life of the working tool or requires the use of expensive tooling.

Known pseudo-α-titanium alloy Grade 9 (Ti-3Al-2,5V), as an alloy with high capacity for cold deformation (see [1], p.44, 45). Has intermediate strength of the alloy Ti-6Al-4V and titanium (600-800 MPa). Used in cold-worked condition and after annealing for stress relieving; has high corrosion resistance in many environments, including seawater. Used for the manufacture of pipes of hydraulic and fuel systems of aircraft, missiles, submarines.

The disadvantage of this alloy is its low flexibility, related to the fact that in the manufacture of large structural products is mandatory removal of internal stresses. With this purpose, the products are subjected to annealing, with the strength characteristics of the alloy Grade 9 drop to 400-500 MPa.

The closest analogue of the claimed invention is α+β-titanium Slav, including 3,0-5,0 Al, 2.1 to 3.7 V; 0,85-3,15 Mo; 0,85-3,15 Fe; 0,06-0,2 O2and inevitable impurities (Japan's bid No. 3007214 B2, publ. 07.02.2000) prototype.

The disadvantage of the above alloy is a high content of iron and molybdenum, which are prone to segregation. To reduce probably the tee occurrence liquation heterogeneity it is necessary to use special technology ingots, and to rolling and forging with small degrees of deformation to avoid the scenery beta-Fleku", which reduces performance.

The problem to which this invention is directed, is the creation of a universal titanium alloy with the lowest cost of production and ability to produce from a wide range of products from titanium alloys, such as large forgings and stamping, as well as painted steel sheet and foil with the necessary strength and plastic characteristics and structure.

Technical result achieved in the implementation of the claimed invention, is in the regulation of the optimal combination of αand β-stabilizing alloying components, semi-finished products.

The technical result is achieved by the fact that in the alloy based on titanium consisting of aluminum, vanadium, molybdenum, iron and oxygen, according to the invention the components are taken in the following ratio, wt.%:

Aluminumof 3.5-4.4
Vanadium2,0-4,0
Molybdenum0,1-0,8
Ironmax 0,4
Oxygenmax 0,25
Titaniumrest

With the combination of high strength and technological plasticity of the proposed alloy is achieved by deliberate choice and experimental evaluation of ranges of doping. Content α-stabilizing elements (aluminum, oxygen) and β-stabilizing elements (vanadium, molybdenum and iron) selected necessary and sufficient to achieve the goal.

Aluminum is the stabilizer α-phase for α+β-titanium alloys, which provides increased mechanical strength. However, when the content of aluminum in the inventive alloy is less than 3.5%of the required strength cannot be achieved. If the content of aluminum exceeds 4.4%, hot deformation resistance increases and deformation at lower temperatures deteriorates, leading to decreased performance.

Vanadium is added to the titanium as stabilizers β-phase for α+β-titanium alloys, which provides increased mechanical strength, and does not form brittle intermetallic compounds with titanium. The presence of vanadium in the alloy as stabilization β-phase hinders the formation of α2- superstructure α-phase and contributes to the improvement not only of the strength properties, but also plasticity. When the vanadium content is less than 2%, a sufficient strength, which should be obtained on the basis of the invention cannot be achieved. If the vanadium content exceeds 4.0 percent, superplastic elongation is decreased due to excessive reduction tempera is URS polymorphic transformation. The content of vanadium in the range of 2.0-4.0% in this alloy has the advantage due to the fact that to obtain it can be used waste Ti6Al4V alloy, widely used in our company.

Molybdenum is added to the titanium as stabilizers β-phase for α+β-titanium alloys. Introduction molybdenum in the range of 0.1 to 0.8% provides complete solubility in his α-the phase that allows you to obtain the necessary strength characteristics without reducing plastic properties. If the molybdenum content exceeds 0.8 percent, increasing the specific weight of the alloy due to the fact that molybdenum is a heavy metal, and plastic properties of the alloy are reduced. The molybdenum content is less than 0.1% does not provide the properties of the alloy in full.

The introduction of iron in the alloy up to 0.4% increases volume fraction β-phase, reducing the deformation resistance during hot processing of the alloy, which helps to avoid the formation of defects such as cracks. The iron content of more than 0.4% leads to liquation processes with the formation of beta-Fleku" melting and solidification of the alloy, which leads to heterogeneity of mechanical properties, particularly ductility.

Oxygen provides increased mechanical strength in the formation of solid solution, mainly in the α-phase. The oxygen content greater than 0.25% can gain and reduce plastic properties of the alloy.

As inevitable impurities in the alloy may contain up to 0.1% carbon and up to 0.05% nitrogen, while the total amount of impurities should not exceed 0.16 per cent.

To study the properties of the inventive alloy was melted using a double vacuum arc remelting ingots of the following chemical composition (table 1).

Table 1
AlloyThe chemical composition of the alloy, wt.%
AlVMoFeO
1a 3.92,20,20,130,17
24,32,80,30,240,23
34,33,30,60,320,20

From each ingot by hot deformation were made rods with a diameter of 50 mm portion of the rod was subjected to a heat treatment by annealing at a temperature of 750°S, shutter speed, 1 hour and cooled in air. Were investigated at room temperature mechanical properties of bars, subjected to heat treatment, and bars without heat treatment. The research results are summarized in table 2. In addition to omnitele were investigated mechanical properties β -mounted workpieces subjected to a heat treatment at a temperature of 710°S, shutter speed, 3 hours and cooling in air. The results of testing the mechanical properties of the billets produced draft α+β and β-region, are shown in table 2.

Table 2
AlloyThe treatment modeMechanical properties
σin, MPaσof 0.2, MPaδ, %ψ, %
1Without annealing81073515,238,2
750°1 hour, the air78069313,232,0
2Without annealing96084014,233,1
750°1 hour, the air92084513,632,5
3α+β-region710°3 hours, the air9008351533,0
β-region710°3 hours, the air8708004 28,0

We offer alloy in comparison with the known has high versatility, cost-effective, has a lower cost due to the fact that its production waste is used widely known alloys such as Ti6Al4V alloy. This alloy has the necessary and sufficient level of mechanical properties and can be used by deformation as in α+β-area and β-areas for the manufacture of a wide range of products, including large-size forgings and forgings, as well as thin sheets and foil.

Alloy based on titanium consisting of aluminum, vanadium, molybdenum, iron, oxygen, characterized in that the alloy components are taken in the following ratio, wt.%:

Aluminumof 3.5-4.4
Vanadium2,0-4,0
Molybdenum0,1-0,8
Ironmax 0,4
Oxygenmax 0,25
TitaniumRest



 

Same patents:

FIELD: metallurgy, in particular, titanium-based materials resistant to change of color.

SUBSTANCE: construction material of pure titanium contains, wt%: Fe 0.08 or less; Nb 0.02 or less; Co 0.02 or less, and is provided with surface oxide film having thickness of 170Å or less. Method involves producing material from pure titanium; etching and heating to temperature X( C) within the range of from 130 C to 280 C for time T (min) satisfying condition of T≥239408xX-2,3237.

EFFECT: increased resistance to change of color for prolonged time as compared to traditional materials.

3 cl, 2 dwg, 4 tbl, 3 ex

FIELD: medicine; instrument-making industry; radio industry; production of materials with a memory effect of the form.

SUBSTANCE: the invention is pertaining to the materials with a memory effect of the form and with the modified surface, which may be used as implants in medicine and as the temperature sensors, thermo-sensitive and executive elements and designs in instrument-making industry, the radio industry. The offered material consists of a base made out of a titanium nickelide of the following composition (in at. %): titanium - 49-51, nickel - the rest, and the surface layer modified by alloying elements. The modified surface layer is formed by irradiation with a low-energy high-current electronic beam and has a depth of 1000-2500 nanometers and the dimensions of the crystal grains of no more than 30 nanometers. In the capacity of the alloying elements it contains oxygen and carbon at the following ratio of components (in at. %): oxygen - 10-20, carbon - 10-15, titanium - 40-50, nickel - the rest. The technical result of the invention is production of the materials with an effect of memory of the form and a high degree capability of the form restoration both at a low and high deforming loadings.

EFFECT: the invention ensures production of the materials with an effect of memory of the form and a high degree capability of the form restoration both at a low and high deforming loadings.

1 tbl, 1 ex

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EFFECT: the invention ensures production of a brick out of the high-strength titanium alloy having a super pliability, excellent fatigue characteristics and moldability.

7 cl, 7 dwg, 21 tbl, 2 ex

FIELD: metallurgy.

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EFFECT: improved properties and quality of alloy.

3 cl, 2 tbl, 3 ex

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8 cl, 5 tbl, 6 dwg, 4 ex

FIELD: powder metallurgy, namely sintered titanium base alloys used as constructional materials.

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EFFECT: enhanced mechanical properties of alloy.

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2 cl, 1 tbl, 1 ex

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16 cl, 3 tbl, 1 ex, 15 dwg

The invention relates to the field of metallurgy, namely the creation of a modern titanium alloys used for manufacturing high-strength and high-tech products, including large, i.e

FIELD: mechanical engineering; piston internal combustion engines.

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EFFECT: improved quality of valve and increased reliability in operation.

16 cl, 3 tbl, 1 ex, 15 dwg

FIELD: metallurgy, in particular alloy with shape memory effect useful as implants in medicine, as temperature sensors, thermosensitive elements in equipment engineering, radio engineering, etc.

SUBSTANCE: claimed alloys contain a) (at. %) titanium 48-52; cobalt 20-30; and balance: gold; and b) titanium 48-52; iron 13,1-16; and balance: gold. Materials of present invention are free from nickel and have shape memory effect and superelasticity at human body temperatures that provides high biomechanical compatibility of implant made from the same in contacting region with various tissues of living organism.

EFFECT: alloys with excellent shape memory effect and superelasticity.

2 cl, 1 tbl, 1 ex

FIELD: powder metallurgy, namely sintered titanium base alloys used as constructional materials.

SUBSTANCE: sintered titanium base alloy contains, mass. %: aluminum, 5.5 - 7.0; zirconium, 1.4 -2.5; molybdenum,, 0.5 - 1.8; vanadium,, 0.8 -2.3; titanium, the balance. Alloy is prepared of powder of said content with particle size in range 0.5 - 3.0 micrometers. Structure of particles includes martensite α - phase and ω-phase with coherent dissipation range 300 - 600 Å. Percentage density of alloy - 99.6%. In structure of alloy there is no α2 - phase. Alloy is prepared by compacting under pressure 1200 Mpa, sintering at 1523 K for 3 hours in vacuum 0.0133 Mpa, annealing at 723 - 823 K for 1.5 hours and cooling together with furnace until room temperature.

EFFECT: enhanced mechanical properties of alloy.

FIELD: metallurgy, namely processes for forging titanium alloys and blank of such alloy suitable for forging.

SUBSTANCE: method comprises steps of preparing blank and forging it. Forging is realized at providing mechanical hardening factor equal to 1.2 or less and at difference of hardness values between central (along width) zone and near-surface zone equal to 60 or less by Vickers. Factor of mechanical hardening is determined as HV(def)/HV(ini), where HV(ini) - hardness of titanium alloy blank before forging; HV(def) -hardness of titanium alloy blank after forging at forging reduction 20%. Forging may be realized at deformation rate from 2 x 10 -4 s -1 to 1s-1 while keeping relations (T β - 400)°C ≤ Tm ≤ 900°C and 400°C ≤ Td ≤ 700°C, where Tβ (°C) -temperature of β-phase transition of titanium alloy, T m(°C) - temperature of worked blank; Td(°C) - temperature of die set. Blank has factor of mechanical hardening 1.2 or less and difference of hardness values between central (along width) zone and near-surface zone equal to 60 or less by Vickers.

EFFECT: possibility for forging titanium alloy blanks at minimum difference of material properties along depth, simplified finishing of blank surface after forging, reduced cracking of blank material, good workability of blank with favorable ductility and fatigue properties.

8 cl, 5 tbl, 6 dwg, 4 ex

FIELD: metallurgy.

SUBSTANCE: invention proposes titanium-base alloy and article made of thereof. Alloy comprising aluminum, molybdenum, vanadium, chrome, iron, zirconium, oxygen, carbon, hydrogen, nitrogen, copper and nickel comprises additionally silicon and tungsten in the following ratio of components, wt.-%: aluminum, 2.0-6.8; molybdenum, 1.0-3.5; vanadium, 3.0-6.0; chrome, 0.4-1.6; iron, 0.2-1.2; zirconium, 0.01-0.3; oxygen, 0.04-0.14; carbon, 0.02-0.1; hydrogen, 0.003-0.02; nitrogen, 0.005-0.05; copper, 0.001-0.1; nickel, 0.001-0.01; silicon, 0.02-0.15; tungsten, 0.001-0.03, and titanium, the balance. Invention provides the development of titanium alloys designated for making plane stringers, ribs, frames, fuselage, wings and engines and for applying as material for welding. Invention provides enhancing strength and crack-resistance of the basic alloy and welding joints and reducing article mass.

EFFECT: improved properties and quality of alloy.

3 cl, 2 tbl, 3 ex

FIELD: non-ferrous metallurgy; methods of titanium alloy bricks production.

SUBSTANCE: the invention is pertaining to the field of non-ferrous metallurgy, in particular, to the brick made out of α+β titanium alloy and to a method of its manufacture. The offered brick consists of the following components (in mass %): aluminum - 4-5, vanadium - 2.5-3.5, iron - 1.5-2.5, molybdenum - 1.5-2.5, titanium - the rest. At that the alloy out of which the brick is manufactured, contains - 10-90 volumetric % of the primary α-phase. The average grain size of the primary α-phase makes 10 microns or less in a cross-section plain parallel to the brick rolling direction. Elongation of grain of the primary α -phase is the four-fold or less. The offered method of manufacture of the given brick includes a stage of a hot rolling. At that before the stage of the hot rolling conduct a stage of the alloy heating at the surfaces temperature (Tβ-150)- Tβ°C. During realization of the stage of the hot rolling the surface temperature is kept within the range of (Tβ-300)-( Tβ -50)°C, and the final surface temperature, that is a surface temperature directly after the last rolling, makes (Tβ-300)-( Tβ-100)°C, where Tβ is a temperature of α/β-transition. The technical result of the invention is formation of a brick out of the high-strength titanium alloy having a super pliability, excellent fatigue characteristics and moldability.

EFFECT: the invention ensures production of a brick out of the high-strength titanium alloy having a super pliability, excellent fatigue characteristics and moldability.

7 cl, 7 dwg, 21 tbl, 2 ex

FIELD: nonferrous metallurgy; aircraft industry; mechanical engineering; development of alloys on the basis of titanium.

SUBSTANCE: the invention is pertaining to the field of nonferrous metallurgy, in particular, to development of alloys on the base of titanium, working at the heightened temperatures. It may be used in an aircraft industry for manufacture of components, for example, disks, vanes, rings, and also in mechanical engineering. The invention presents an alloy based on titanium and a hardware product produced out of it. The alloy contains aluminum, zirconium, stannum, niobium, a molybdenum, silicon, carbon and oxygen. At that it in addition contains tungsten and iron, at the following ratio of components (in mass %): aluminum 5.8 - 6.6, zirconium 2.0 - 4.0, stannum - 2.5 - 4.5, niobium - 0.8-2.5, molybdenum - 0.8- 1.5, silicon - 0.25-0.45, carbon - 0.05-0.1, oxygen -0.05-0.12, tungsten - 0.35-0.8, iron - 0.06-0.13, titanium - the rest. The technical result is a development of an alloy having the lower weight at the given short-time strength and a specific low-cycle fatigue, that increases an operational life and reliability of the components of the hot tract of aero-engines.

EFFECT: the invention ensures development of an alloy with the lower weight at the given short-time strength and a specific low-cycle fatigue with increased operational life and reliability.

2 cl, 2 tbl, 3 ex

FIELD: medicine; instrument-making industry; radio industry; production of materials with a memory effect of the form.

SUBSTANCE: the invention is pertaining to the materials with a memory effect of the form and with the modified surface, which may be used as implants in medicine and as the temperature sensors, thermo-sensitive and executive elements and designs in instrument-making industry, the radio industry. The offered material consists of a base made out of a titanium nickelide of the following composition (in at. %): titanium - 49-51, nickel - the rest, and the surface layer modified by alloying elements. The modified surface layer is formed by irradiation with a low-energy high-current electronic beam and has a depth of 1000-2500 nanometers and the dimensions of the crystal grains of no more than 30 nanometers. In the capacity of the alloying elements it contains oxygen and carbon at the following ratio of components (in at. %): oxygen - 10-20, carbon - 10-15, titanium - 40-50, nickel - the rest. The technical result of the invention is production of the materials with an effect of memory of the form and a high degree capability of the form restoration both at a low and high deforming loadings.

EFFECT: the invention ensures production of the materials with an effect of memory of the form and a high degree capability of the form restoration both at a low and high deforming loadings.

1 tbl, 1 ex

FIELD: metallurgy, in particular, titanium-based materials resistant to change of color.

SUBSTANCE: construction material of pure titanium contains, wt%: Fe 0.08 or less; Nb 0.02 or less; Co 0.02 or less, and is provided with surface oxide film having thickness of 170Å or less. Method involves producing material from pure titanium; etching and heating to temperature X( C) within the range of from 130 C to 280 C for time T (min) satisfying condition of T≥239408xX-2,3237.

EFFECT: increased resistance to change of color for prolonged time as compared to traditional materials.

3 cl, 2 dwg, 4 tbl, 3 ex

Titanium-base alloy // 2269584

FIELD: metallurgy.

SUBSTANCE: invention relates to titanium-base alloys used in making high-strength and high-efficient articles. Titanium-base alloy consists of aluminum, vanadium, molybdenum, iron and oxygen. Components of alloy are taken in the following ratio, wt.-%: aluminum, 3.5-4.4; vanadium, 2.0-4.0; molybdenum, 0.1-0.8; iron, max 0.4; oxygen, max 0.25, and titanium, the balance. Invention provides the development of universal alloy for large-sized forged pieces and stamps, thin-sheet roll and foil possessing the necessary strength and plastic indices and structure.

EFFECT: improved and valuable properties of alloy.

2 tbl

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