EP1577409B1 - Titanium-based alloy - Google Patents
Titanium-based alloy Download PDFInfo
- Publication number
- EP1577409B1 EP1577409B1 EP03811968A EP03811968A EP1577409B1 EP 1577409 B1 EP1577409 B1 EP 1577409B1 EP 03811968 A EP03811968 A EP 03811968A EP 03811968 A EP03811968 A EP 03811968A EP 1577409 B1 EP1577409 B1 EP 1577409B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- alloy
- mass
- titanium
- strength
- iron
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C14/00—Alloys based on titanium
Definitions
- the invention relates to the metallurgical one, and more particularly to creation of the modem titanium alloys used for making high-strength and high-tech items, including the large-sized ones, i.e. alloys having a broad range of applications.
- titanium alloys One of the known titanium alloys is the alloy containing, in % by weight: aluminum 2-6, molybdenum 6-9, vanadium 1-3, chromium 0,5-2,0, iron 0-1,5, titanium - balance (Inventor's Certificate USSR No. 180351, Class C22C 14/00, published 1966).
- This alloy was proposed for making die-forgings and forgings for the highly loaded structural parts.
- the significant drawback is its tendency to forming the high density inclusions when melting ingots due to the high content of the refractory element molybdenum (> 6%). The presence of such inclusions in the high-loaded parts leads to destruction of such parts when being in service.
- the other known titanium alloy containing % by weight: 4,0-6,3 Al; 4,0-5,0 V; 1,5-2,5 Mo; 0,8-1,4 Cr; 0,4-0,8 Fe; 0,01-0,08 Zr; 0,01-0,25 C; 0,03-0,25 O; balance - titanium (Inventor's Certificate USSR No. 555161, Class C22C 14/00, published 1977).
- This alloy has the high strength properties, fine ductility, not disposed to forming the high density inclusions.
- the drawback of this alloy is the impossibility of cold die-forging, caused by insufficient level of the index of the process plasticity as age, such as the degree of cold upsetting(less than 60%).
- the closest to the claimed invention from the technical point is the alloy with the base of titanium, containing % by weight: 2,2-3,8 Al; 4,5-5,9 V; 4,5-5,9 Mo; 2,0-3,6 Cr; 0,2-0,8 Fe; 0,01-0,08 Zr; 0,01-0,25 C; 0,03-0,25 O; Ti - balance (RF Patent No. 2150528, Class C22C 14/00, published 2000) - prototype.
- Alloy has the high level of plasticity as quenched, in this case they achieve the degree of cold upsetting ⁇ 75%.
- the known alloy has the insufficiently high level of the working temperatures, this limits the scope of its application as a structural material for making parts, used at increased temperatures.
- This invention aims at creation of the titanium alloy with the increased heat-resistance, which ensures the possibility of making the heavy large-sized parts with the high level of the strength and plastic properties, used at increased temperatures.
- the technical result is achieved due to the fact that in the alloy with the base of titanium, containing aluminum, vanadium, molybdenum, chromium, iron, zirconium, carbon, oxygen, according to the invention, the components are taken in the following ratio, weight %: Aluminum 2,2 - 3,8 Vanadium 4,5 - 5,9 Molybdenum 4,5 - 5,9 Chromium 2,0 - 3,6 Zirconium 0,1 - 0,4 Iron 0,01 - 0,18 Carbon 0,01 - 0,25 Oxygen 0,03 - 0,25 Titanium balance
- the combination of high strength and plasticity of the proposed alloy is achieved as a result of the task-oriented choice and experimental evaluation of the alloying ranges.
- Content of the ⁇ - stabilizing elements (aluminum, oxygen, carbon) and ⁇ -stabilizers (molybdenum, vanadium, chromium, iron) is chosen as required and sufficient for achievement of the set target.
- the proposed alloy ensures the possibility to effectively regulate the strength level of the alloy as aged within the wide ranges.
- Balancing aluminum and chromium content in the claimed alloy ensures high alloy ability for cold die forging (fine rolling to bar) and possibility of alloy strengthening by the thermal techniques obtaining the high level of the strength and plastic properties.
- the content of V and Mo is set as ⁇ 4,5%.
- V and Mo content is accepted 5,9% max due to the hazard of significant growth of segregation non-uniformity and occurrence of defects when using the hard master alloys.
- Amount of zirconium in the alloy from 0,1 to 0,4% ensures increase of the tensile strength without lowering of the metal processibility during hot (not increases the flow stress) and cold (not decreases the plasticity resource) deformation. In this case stabilizing the ⁇ -phase, zirconium increases creep resistance and high-temperature strength.
- Ranges of alloying with zirconium and iron are selected on the base of experimental evaluation of the alloy mechanical properties in the proposed composition range. Content of zirconium from 0,1 to 0,4% and iron to 0,18% ensures the increase of the ultimate strength of the alloy in the as quenched and aged condition.
- the proposed combination of the components of the alloy and their % ratio in complex ensures the possibility of the alloy deformation in the greater temperature range and obtaining parts by cold die forging.
- Test results show that the declared items (bars with dia 50 mm) from titanium-base alloy have the high processing plasticity level as quenched, in this case they achieve the degree of cold upsetting > 75% in combination with high strength obtained as a result of the subsequent ageing ( ⁇ B > 1500 Mpa).
- the claimed alloy has the higher range of the working temperatures (10-15°C higher than the alloy - prototype has), this gives the possibility to use it not only when making the bolt heads through cold heading, in cold threading, in production of coil springs, and for making large semis up to 60mm in section, with the high level of strength and plastic properties, used at increased temperatures.
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Steel (AREA)
- Forging (AREA)
- Manufacture And Refinement Of Metals (AREA)
- Materials For Medical Uses (AREA)
- Springs (AREA)
Abstract
Description
- The invention relates to the metallurgical one, and more particularly to creation of the modem titanium alloys used for making high-strength and high-tech items, including the large-sized ones, i.e. alloys having a broad range of applications.
- One of the known titanium alloys is the alloy containing, in % by weight: aluminum 2-6, molybdenum 6-9, vanadium 1-3, chromium 0,5-2,0, iron 0-1,5, titanium - balance (Inventor's Certificate USSR No. 180351, Class C22C 14/00, published 1966).
This alloy was proposed for making die-forgings and forgings for the highly loaded structural parts. The significant drawback is its tendency to forming the high density inclusions when melting ingots due to the high content of the refractory element molybdenum (> 6%). The presence of such inclusions in the high-loaded parts leads to destruction of such parts when being in service. - The other known titanium alloy, containing % by weight: 4,0-6,3 Al; 4,0-5,0 V; 1,5-2,5 Mo; 0,8-1,4 Cr; 0,4-0,8 Fe; 0,01-0,08 Zr; 0,01-0,25 C; 0,03-0,25 O; balance - titanium (Inventor's Certificate USSR No. 555161, Class C22C 14/00, published 1977).
- This alloy has the high strength properties, fine ductility, not disposed to forming the high density inclusions.
- The drawback of this alloy is the impossibility of cold die-forging, caused by insufficient level of the index of the process plasticity as age, such as the degree of cold upsetting(less than 60%).
- The closest to the claimed invention from the technical point is the alloy with the base of titanium, containing % by weight: 2,2-3,8 Al; 4,5-5,9 V; 4,5-5,9 Mo; 2,0-3,6 Cr; 0,2-0,8 Fe; 0,01-0,08 Zr; 0,01-0,25 C; 0,03-0,25 O; Ti - balance (RF Patent No. 2150528, Class C22C 14/00, published 2000) - prototype.
- Alloy has the high level of plasticity as quenched, in this case they achieve the degree of cold upsetting ≥ 75%.
- However, the known alloy has the insufficiently high level of the working temperatures, this limits the scope of its application as a structural material for making parts, used at increased temperatures.
- This invention aims at creation of the titanium alloy with the increased heat-resistance, which ensures the possibility of making the heavy large-sized parts with the high level of the strength and plastic properties, used at increased temperatures.
- The technical result achieved when patent pending is in regulating the optimum combination of α- and β- stabilizing alloying elements in the finished semiproduct.
- The technical result is achieved due to the fact that in the alloy with the base of titanium, containing aluminum, vanadium, molybdenum, chromium, iron, zirconium, carbon, oxygen, according to the invention, the components are taken in the following ratio, weight %:
Aluminum 2,2 - 3,8 Vanadium 4,5 - 5,9 Molybdenum 4,5 - 5,9 Chromium 2,0 - 3,6 Zirconium 0,1 - 0,4 Iron 0,01 - 0,18 Carbon 0,01 - 0,25 Oxygen 0,03 - 0,25 Titanium balance - The combination of high strength and plasticity of the proposed alloy is achieved as a result of the task-oriented choice and experimental evaluation of the alloying ranges. Content of the α - stabilizing elements (aluminum, oxygen, carbon) and β-stabilizers (molybdenum, vanadium, chromium, iron) is chosen as required and sufficient for achievement of the set target. Besides, the proposed alloy ensures the possibility to effectively regulate the strength level of the alloy as aged within the wide ranges.
- Balancing aluminum and chromium content in the claimed alloy ensures high alloy ability for cold die forging (fine rolling to bar) and possibility of alloy strengthening by the thermal techniques obtaining the high level of the strength and plastic properties.
- With aluminum and chromium content below the minimum values the alloy strength is lowered after thermostrengthening (σB < 1400 MPa), i.e. the problem put is not achieved.
- When aluminum and chromium content exceeds the declared limit the alloy plasticity lowers (δ < 8%, ψ < 40%) with the high strength level (σB ≥ 1400 MPa).
- To ensure the required strength (≥ 1150 MPa) as quenched and aged, as well as to perform quenching in the air, not in water, the content of V and Mo is set as ≥ 4,5%.
- V and Mo content is accepted 5,9% max due to the hazard of significant growth of segregation non-uniformity and occurrence of defects when using the hard master alloys.
- As the increase of V and Mo content, as already said, is not recommended to be above 5,9%, then for the subsequent (above 1150 MPa) increase of the strength properties (as quenched and aged) they introduce the moderate additions of Cr (2,0-3,6%) and Fe (to 0,18%) within the limits, which do not bring to the occurrence of the visible dentritic or zonal segregation.
-
- Amount of zirconium in the alloy from 0,1 to 0,4% ensures increase of the tensile strength without lowering of the metal processibility during hot (not increases the flow stress) and cold (not decreases the plasticity resource) deformation. In this case stabilizing the α-phase, zirconium increases creep resistance and high-temperature strength.
- Introduction of zirconium exceeding 0,4% significantly lowers the alloy processing plasticity during cold strain.
- Ranges of alloying with zirconium and iron are selected on the base of experimental evaluation of the alloy mechanical properties in the proposed composition range. Content of zirconium from 0,1 to 0,4% and iron to 0,18% ensures the increase of the ultimate strength of the alloy in the as quenched and aged condition.
- The proposed combination of the components of the alloy and their % ratio in complex ensures the possibility of the alloy deformation in the greater temperature range and obtaining parts by cold die forging.
- For the evaluation of the alloy properties the double-melt ingots were vaccum arc remelting melted with the following alloy compositions (Table 1)
Table 1 Alloy Alloy chemistry, % by weight Al V Mo Cr Fe Zr C O2 Ti 1 2,2 4,5 4,5 2,0 0,1 0,1 0,01 0,03 balance 2 3,0 5,2 4,8 2,8 0,15 0,2 0,2 0,2 balance 3 3,8 5,9 5,9 3,6 0,18 0,4 0,25 0,25 balance - The bars were made of each ingot with the diameter of 50 mm. The bars were heat-treated to obtain the high strength. The mechanical properties of bars at room temperature are show in Table 2.
Table 2 Alloy Rate of deformation when cold upsetting ε, % Mechanical properties Ultimate Strength σB(MPa) Yield Strength σ0,2(MPa) Elongation δ( %) Reduction of Area ψ( % ) Resistance to shear τcp. (MPa) 1 77 1425 1370 11 48 915 2 75 1470 1385 10 43 945 3 72 1515 1455 9 41 975 Required level of properties 70 1400 1300 8 40 900 - Test results show that the declared items (bars with dia 50 mm) from titanium-base alloy have the high processing plasticity level as quenched, in this case they achieve the degree of cold upsetting > 75% in combination with high strength obtained as a result of the subsequent ageing (σB > 1500 Mpa).
- The claimed alloy has the higher range of the working temperatures (10-15°C higher than the alloy - prototype has), this gives the possibility to use it not only when making the bolt heads through cold heading, in cold threading, in production of coil springs, and for making large semis up to 60mm in section, with the high level of strength and plastic properties, used at increased temperatures.
Claims (1)
- Alloy with the base of titanium, containing aluminum, vanadium, molibdenum, chromium, iron, zirconium, carbon, oxygen, differing in the fact that the alloy components are taken in the following ratio of the % by weight.
Aluminum 2,2 - 3,8 Vanadium 4,5 - 5,9 Molybdenum 4,5 - 5,9 Chromium 2,0 - 3,6 Zirconium 0,1-0,4 Iron 0,01 - 0,18 Carbon 0,01 - 0,25 Oxygen 0,03 - 0,25 Titanium balance
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
RU2002131488 | 2002-11-25 | ||
RU2002131488/02A RU2228966C1 (en) | 2002-11-25 | 2002-11-25 | Titanium-based alloy |
PCT/RU2003/000378 WO2004048627A1 (en) | 2002-11-25 | 2003-08-21 | Titanium-based alloy |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1577409A1 EP1577409A1 (en) | 2005-09-21 |
EP1577409A4 EP1577409A4 (en) | 2006-08-16 |
EP1577409B1 true EP1577409B1 (en) | 2007-11-21 |
Family
ID=32390762
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP03811968A Expired - Lifetime EP1577409B1 (en) | 2002-11-25 | 2003-08-21 | Titanium-based alloy |
Country Status (9)
Country | Link |
---|---|
US (1) | US20060115374A1 (en) |
EP (1) | EP1577409B1 (en) |
AU (1) | AU2003261684A1 (en) |
DE (1) | DE60317708T2 (en) |
DK (1) | DK1577409T3 (en) |
ES (1) | ES2293095T3 (en) |
HK (1) | HK1079826B (en) |
RU (1) | RU2228966C1 (en) |
WO (1) | WO2004048627A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP7022698B2 (en) * | 2016-04-25 | 2022-02-18 | ハウメット エアロスペース インコーポレイテッド | BCC materials of titanium, aluminum, vanadium, and iron and products made from them |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
SU555161A1 (en) * | 1975-02-14 | 1977-04-25 | Ордена Ленина Предприятие П/Я Р-6209 | Titanium based alloy |
US4943412A (en) * | 1989-05-01 | 1990-07-24 | Timet | High strength alpha-beta titanium-base alloy |
US5980655A (en) * | 1997-04-10 | 1999-11-09 | Oremet-Wah Chang | Titanium-aluminum-vanadium alloys and products made therefrom |
RU2150528C1 (en) * | 1999-04-20 | 2000-06-10 | ОАО Верхнесалдинское металлургическое производственное объединение | Titanium-based alloy |
RU2169204C1 (en) * | 2000-07-19 | 2001-06-20 | ОАО Верхнесалдинское металлургическое производственное объединение | Titanium-based alloy and method of thermal treatment of large-size semiproducts from said alloy |
RU2192493C2 (en) * | 2000-12-19 | 2002-11-10 | Государственное предприятие Всероссийский научно-исследовательский институт авиационных материалов | Titanium-based alloy and article made from such alloy |
-
2002
- 2002-11-25 RU RU2002131488/02A patent/RU2228966C1/en active
-
2003
- 2003-08-21 ES ES03811968T patent/ES2293095T3/en not_active Expired - Lifetime
- 2003-08-21 US US10/535,791 patent/US20060115374A1/en not_active Abandoned
- 2003-08-21 AU AU2003261684A patent/AU2003261684A1/en not_active Abandoned
- 2003-08-21 WO PCT/RU2003/000378 patent/WO2004048627A1/en active IP Right Grant
- 2003-08-21 EP EP03811968A patent/EP1577409B1/en not_active Expired - Lifetime
- 2003-08-21 DE DE60317708T patent/DE60317708T2/en not_active Expired - Lifetime
- 2003-08-21 DK DK03811968T patent/DK1577409T3/en active
-
2005
- 2005-12-29 HK HK05112115.0A patent/HK1079826B/en not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
DK1577409T3 (en) | 2008-02-18 |
AU2003261684A1 (en) | 2004-06-18 |
HK1079826A1 (en) | 2006-04-13 |
EP1577409A1 (en) | 2005-09-21 |
RU2228966C1 (en) | 2004-05-20 |
US20060115374A1 (en) | 2006-06-01 |
HK1079826B (en) | 2008-05-02 |
WO2004048627A1 (en) | 2004-06-10 |
ES2293095T3 (en) | 2008-03-16 |
DE60317708D1 (en) | 2008-01-03 |
DE60317708T2 (en) | 2008-10-30 |
EP1577409A4 (en) | 2006-08-16 |
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