Titanium-based high-strength alpha-beta alloy

FIELD: metallurgy; high-strength alpha-beta alloys.

SUBSTANCE: Specification gives versions of titanium-based alpha-beta alloys. The proposed alloy contains the following components: aluminum, 4.5-5.5; vanadium, 3.0-5.0; molybdenum, 0.3-1.8; iron, 0.2-0.8; oxygen, 0.12-0.25; by-elements and admixtures, lesser than 0.1 each; total amount of by-elements and admixtures is lesser than 0.5; the remainder being titanium.

EFFECT: high strength of alloy, good workability and ballistic properties.

4 cl, 5 tbl, 3 ex

 

The technical field to which the invention relates.

The present invention relates to high strength alpha-beta alloy, characterized by an improved combination of strength, workability and ballistic properties.

Prior art

Alloys based on titanium are used where required large quantities of relationship strength-to-weight ratio along with high temperature resistance and corrosion resistance. Titanium alloys can be divided into the following groups: alloys with alpha phase alloys with beta-phase and alpha-beta alloys. Alpha-beta alloys contain one or more alpha-stabilizing element and one or more beta-stabilizing element. These alloys can be hardened by heat treatment or thermomechanical processing. In particular, the alloys can be hardened by rapid cooling from high temperature in the alpha-beta region or from a temperature higher than the temperature of the beta-transformation. After this process, known as processing solid solution, followed by treatment at intermediate temperatures, called aging, which receive the necessary mixture consisting of alpha-phase and beta-transformed phase is the main phase in the microstructure of the alloy.

It is desirable to use these alloys in cases when it is necessary to provide the combination of high the th strength, good machinability and good ballistic properties.

Accordingly, the present invention is to provide alpha-beta alloy having such a desirable combination of properties.

Summary of the invention

The proposed alpha-beta alloy contains

Al: from 4.5 to 5.5% (by weight)

V: from 3.0 to 5.0 wt.% (preferably from 3.7 to 4.7 wt.%)

Mo: 0.3 to 1.8 wt.%

Fe: 0.2 to 0.8 wt.%

About: from 0.12 to 0.25 wt.% (preferably from 0.15 to 0.22 wt.%)

Incidental elements and impurities, the contents of each of which does not exceed 0.1 wt.%, and a total content not more than 0.5 wt.%

The rest is titanium

Alloys within the boundaries of a composition corresponding to the invention contain as an essential element aluminum. If the aluminum content is less than 4.5 wt.%, it will not be provided with sufficient strength. On the other hand, if the content of aluminum than 5.5 wt.%, it would be poor machinability.

Vanadium is an essential element as a beta stabilizer in alpha-beta titanium alloys according to the invention. If vanadium in the alloy below 3.0%, it will not be achieved sufficient strength. On the other hand, if vanadium is more than 5,0%, the alloy will be too high content of beta stabilizer, resulting in deterioration of workability Mat is the Rial.

Iron is present as an effective and less expensive beta stabilizing element. Usually approximately 0.1% of iron is due to the use in the production of a titanium alloy suitable for the invention, titanium sponge and other working materials. In other cases, the iron can be added in the form of steel or FeMo ligatures, because the alloy according to the invention as a main element contains molybdenum. Preferably, the upper limit of the iron content is 0.8% But if the iron content exceeds this value, it will adversely affect the machinability of the alloy.

Molybdenum is an important element to stabilize the beta phase, and also provides improved grain microstructure. If molybdenum is less than 0.3%, the desired effect of its use is reached. If the molybdenum content in the alloy exceeds 1.8%, it will deteriorate the machinability of the alloy.

Oxygen serves as a reinforcing element for titanium and its alloys. If oxygen is less than 0.12%, will not be provided with sufficient strength, and the oxygen content greater than 0.25% lead to embrittlement and deterioration of the machinability of the alloy.

The detailed description and specific examples of carrying out the invention

Example 1

Ten ingots-blanks with a diameter of 203 mm alloy Ti-Al-4V were obtained by vacuum arc remelting under laboratory conditions. The chemical composition of these ingots are presented in table 1. In this table, the alloys a, b, C, and E refer to alloys, proposed according to the invention. Alloys D and from F to J are analyzed by the control alloys (for comparison). Alloy J having the composition of Ti-6Al-4V, is a widely known alpha-beta alloy. Manufactured ingots were subjected to forging and rolling to obtain bars of square section with a side of the square 19 mm) or thick plates with thickness of 19 mm To study the basic characteristics of each of the alloys of these preparations was subjected to a heat treatment to improve the ductility at a temperature of 704°C for 1 hour, followed by cooling air. In addition, for each of the rods of square cross section has been the treatment of solid solution and aging (OTRS) and then determined the mechanical properties to study the ability of the alloys to hardening.

Table 2 shows the properties of the proposed alloys defined under tension, after the heat treatment for improving the ductility. Alloys a, b, C, and E show the equivalent strength (ultimate tensile strength (LTP) or 0.2%PT) in relation to the alloy Ti-6Al-4V. Plasticity (OS or UE) alloys a, b, C and E is better than alloy Ti-6Al-4V. Table 3 displays the determined tensile properties offer the R alloys after OTRS and alloy Ti-6Al-4V. Alloys a, b and C show high strength (ultimate tensile strength (LTP) or 0.2%PT) compared to Ti-6Al-4V at least 70,4 MPa. High strength alloys after OTRS mainly due to improved hardenability due to additives Mo and/or Fe. However, if the content of Mo and/or Fe is too large, the ductility is reduced, as is evident from the data for alloys G, H and I.

Table 1
Chemical composition of alloys (wt.%)
AlloyAlloyAlVMoFeSiONote
AndTi-5Al-4V-1Mo-0,6Fe4,943,970,990,570,030,19invention
InTi-5Al-4V-0,5 Mo-0,4 Fe4,953,960,510,380,030,18invention
Ti-5Al-4V-0,5 Mo-0,4 Fe-0,08Si4,953,980,500,390,070,18invention
DTi-5Al-4V-0,5Mo-0,4Fe-0,35Siis 4.93as 4.02 0,510,390,300,17to compare
ETi-5Al-4V-1,5Mo-1Fe4,843,951,520,0990,030,16invention
FTi-4Al-4V-0,5Mo-0,4Fe3,943,951,510,980,030,22to compare
GTi-4Al-4V-2Mo-1,3 Fe3,923,912,011,260,030,19to compare
NTi-4Al-4Mo-0,5Si3,95<0,0013,880,200,470,21to compare
ITi-4Al-2Mo-1,3Fe-0,5Si3,90<0,0012,031,280,450,19to compare
JTi-6Al-4V5,964,060,020,030,020,17to compare

Table 2
Plastic properties of rods, heat-treated to improve the plasticity
AlloyCPD (MPa)the 0.2%PT (MPa)OS (%)UE (%)
And103910251757,9
In101510001753,7
10309711752,1
D106810131342,0
E107910351556,0
F107410171756,1
G107810341754,0
N109010321541,6
I108710301540,7
J10339451544,3
Table 3
Plastic properties of rods subjected to processing in solid solution and aging
AlloyCPD (MPa)the 0.2%PT (MPa)OS (%)UE (%)
And128011981349,8
In119711241351,3
119210791757,2
D127011641348,6
E136612921240,4
F133412161240,5
G137613021035,2
N143213151032,1
I13201193932,1
J111910171553,3
OS - elongation;

UE - reduction of the area of the cross section;

CPD - ultimate tensile strength;

the 0.2% PT=conditional yield strength of 0.2% (σof 0.2- approx. the translation).

(1 ksi (thousand pounds-force/square inch)=? 7.04 baby mortality MPa (R) - approx. translation.)

Example 2

Plate thickness 19 mm, subjected to heat treatment to improve the plasticity, were machined to a thickness of 16 mm On these plates were tested by drilling to evaluate the machinability of the alloys. For tests used high is high-speed steel drills (ALSI M42). Test drilling was carried out under the following conditions:

Drill diameter: 6.4 mm

Hole depth: through hole depth 16 mm

The feed rate of the drill: 0.2 mm/revolution

Rotation speed: 500 rpm

Cooler: water cooler

The life of the drill was determined by the moment when the drill could not drill any hole due to damage to its cutting edge. The test results of the drilling are shown below in table 4. The relative performance of the test drilling in table 4 represent the average value obtained from 2-3 tests. Test drilling was completed, when the relative rate test was approximately 4,0 more. The test drilling showed that the alloys according to the invention, possess much better machinability than the alloy Ti-6Al-4V and other alloys with different chemical composition from the alloy according to this invention. The worst machinability of alloy F due to the high oxygen content.

Table 4
The results of the test drilling
AlloyThe type of alloyThe relative rate test drilling Note
AndTi-5Al-4V-0,6F-oxygen 0,19>4,3invention
InTi-5Al-4V-0,5Mo-0,4Fe-oxygen 0,18>4,2invention
DTi-5Al-4V-0,5Mo-0,4Fe-0,35Si-oxygen 0,17>4,3invention
ETi-5Al-4V-1,5Mo-1Fe-oxygen 0,16>4,0invention
FTi-4Al-4V-1,5Mo-1Fe-oxygen 0,220,2to compare
GTi-4Al-2Mo-1,3Fe-oxygen 0,191,5to compare
NTi-4Al-4Mo-0,5Si-oxygen 0,211,8to compare
ITi-4Al-2Mo-1,3Fe-0,5Si-oxygen 0,190,2to compare
JTi-6Al-4V-oxygen 0,171,0to compare

Example 3

The plate thickness of about 11 mm was manufactured by processing alpha-beta alloy in the form of the original ingot with a diameter of 203 mm, obtained under laboratory conditions. This plate was subjected to heat treatment to improve the ductility, and then etching. As the projectile was used fragment simulating projectile (FIS) in 50 caliber. For each plate was determined by the R value of V 50representing the velocity , providing the probability of full implementation of equal to 50%, and this rate was compared with the established technical requirements. The comparison results are presented in table 5. Value ΔV50the table shows the difference V50between the measured value and technical requirements. Therefore, a positive number in the table shows the excess velocity relative to established technical requirements. As shown in the table, the alloy To demonstrate excellent ballistic characteristics as compared with the alloy Ti-6Al-4V.

Table 5
Data on ballistic characteristics
AlloyAlVMoFeOΔV50(FIS)Note
To4,944.09 to0,5380,3710,171237invention
Ti-6Al-4V-323comparison

Other embodiments of the present invention will be clear to skilled in about the Asti techniques of analysis details of presentation and examples of implementation of the present invention, disclosed in this description. Provides details and examples should be considered only as illustrative, with the true scope and essence of the present invention are disclosed in the following claims.

1. Alpha-beta alloy titanium based, contains, wt%:

Aluminum4,5-5,5
Vanadium3,0-5,0
Molybdenum0,3-1,8
Iron0,2-0,8
Oxygen0,12-0,25

Incidental elements and impurities,the
eachLess than 0.1
in the amount of0.5

TitaniumRest

2. The alloy according to claim 1, comprising vanadium from 3.7 to 4.7 wt.%.

3. The alloy according to claim 1, including oxygen from 0.15 to 0.22 wt.%.

4. Alpha-beta alloy titanium based, contains, wt%:

Aluminum4,5-5,5
Vanadium3.7 to 4.7
Molybdenum0,3-1,8
Iron0,2-0,8
Oxygen0,12-0,25
Incidental elements and impurities,the
eachLess than 0.1
in the amount of0.5

TitaniumRest

5. The alloy according to claim 4, including oxygen from 0.15 to 0.22 wt.%.



 

Same patents:
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

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

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: 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: 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: 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: 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, 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: mechanical engineering; piston internal combustion engines.

SUBSTANCE: invention relates to valve of internal combustion engine, method of its manufacture and heat-resistant titanium alloy used for manufacture of valve consisting of following components, mass %: aluminum 7.5-12.5; molybdenum 1.6-2.6; zirconium 1.4-2.4; silicon 0.1-0.2' yttrium 0.005-0.1; titanium - the rest. It has α+α2+β phase composition with intermetallide α2 phase on Ti3Al base dispersed in α phase. Proposed method includes forming of valve from cylindrical blank by deformation machining with preliminary heating and subsequent heat treatment. Preliminary heating of part of blank related to rod done to temperature 5-20oC lower than temperature of complete polymorphic transformation of alloy, and its deformation machining is carrying out by wedge cross rolling. Deformation machining of part of blank related to head is done by forging with preliminary heating to temperature 5-50oC higher than temperature of complete polymorphic transformation of alloy corresponding to beginning of forging, and forging is finished at temperature lower than complete polymorphic transformation of alloy to form plate head of valve and transition section provided smooth changing of head into rod. Invention provides designing of valve, method of its manufacture and heat-resistant alloy used in manufacture of valve making it possible to operate valve within operating temperature range owing to increased long-term strength and creep resistant of valve head material and increased strength, modulus of elasticity and hardness of valve rod material.

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

16 cl, 3 tbl, 1 ex, 15 dwg

FIELD: mechanical engineering; piston internal combustion engines.

SUBSTANCE: invention relates to valve of internal combustion engine, method of its manufacture and heat-resistant titanium alloy used for manufacture of valve consisting of following components, mass %: aluminum 7.5-12.5; molybdenum 1.6-2.6; zirconium 1.4-2.4; silicon 0.1-0.2' yttrium 0.005-0.1; titanium - the rest. It has α+α2+β phase composition with intermetallide α2 phase on Ti3Al base dispersed in α phase. Proposed method includes forming of valve from cylindrical blank by deformation machining with preliminary heating and subsequent heat treatment. Preliminary heating of part of blank related to rod done to temperature 5-20oC lower than temperature of complete polymorphic transformation of alloy, and its deformation machining is carrying out by wedge cross rolling. Deformation machining of part of blank related to head is done by forging with preliminary heating to temperature 5-50oC higher than temperature of complete polymorphic transformation of alloy corresponding to beginning of forging, and forging is finished at temperature lower than complete polymorphic transformation of alloy to form plate head of valve and transition section provided smooth changing of head into rod. Invention provides designing of valve, method of its manufacture and heat-resistant alloy used in manufacture of valve making it possible to operate valve within operating temperature range owing to increased long-term strength and creep resistant of valve head material and increased strength, modulus of elasticity and hardness of valve rod material.

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

Up!