US20060039819A1 - Metastable beta-titanium alloy - Google Patents

Metastable beta-titanium alloy Download PDF

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Publication number
US20060039819A1
US20060039819A1 US10/496,493 US49649305A US2006039819A1 US 20060039819 A1 US20060039819 A1 US 20060039819A1 US 49649305 A US49649305 A US 49649305A US 2006039819 A1 US2006039819 A1 US 2006039819A1
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US
United States
Prior art keywords
alloy
vanadium
iron
molybdenum
balance
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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.)
Abandoned
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US10/496,493
Inventor
Vladislav Tetyukhin
Igor Levin
Denis Sosnovsky
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VSMPO Avisma Corp PSC
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Individual
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Assigned to PUBLIC STOCK COMPANY \"VSMPO-AVISMA CORPORATION\" reassignment PUBLIC STOCK COMPANY \"VSMPO-AVISMA CORPORATION\" CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: JOINT STOCK COMPANY VERKHNAYA SALDA METALLURGICAL PRODUCTION ASSOCIATION (VSMPO)
Assigned to JOINT-STOCK COMPANY VERKHNAYA SALDA METALLURGICAL PRODUCTION ASSOCIATION reassignment JOINT-STOCK COMPANY VERKHNAYA SALDA METALLURGICAL PRODUCTION ASSOCIATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: LEVIN, IGOR VASILIEVICH, SOSNOVSKY, DENIS VALERYEVICH, TETYUKHIN, VIADISLAV VALENTINOVICH
Publication of US20060039819A1 publication Critical patent/US20060039819A1/en
Assigned to PUBLIC STOCK COMPANY "VSMPO-AVISMA CORPORATION" reassignment PUBLIC STOCK COMPANY "VSMPO-AVISMA CORPORATION" CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: JOINT STOCK COMPANY VERKHNAYA SALDA METALLURGICAL PRODUCTION ASSOCIATION (VSMPO)
Assigned to PUBLIC STOCK COMPANY "VSMPO-AVISMA CORPORATION" reassignment PUBLIC STOCK COMPANY "VSMPO-AVISMA CORPORATION" CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: JOINT STOCK COMPANY VERKHNAYA SALDA METALLURGICAL PRODUCTION ASSOCIATION (VSMPO)
Priority to US12/069,496 priority Critical patent/US20080199350A1/en
Abandoned legal-status Critical Current

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Classifications

    • 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

  • This invention relates to the non-ferrous metallurgy, and more particularly to the development of new titanium-base alloys combining high strength and ductility properties using relatively low-cost alloying elements.
  • the alloys of this invention can be applied in a wide range of products especially fasteners and different coil springs.
  • One of the known titanium alloys is the alloy containing (mass %): 2-6 Al; 6-9 Mo; 1-3 V; 0.5-2 Cr; 0-1.5 Fe; Ti balance.
  • Ref USSR Inventor's Certificate No. 180351, Class C22C 14/00, 1966.
  • this alloy has insufficient ductility due to the high content of Al and the presence of Cr. Besides this alloy is rather expensive.
  • the other known titanium alloy contains (mass %): 4-6.3 Al; 4.5-5.9 V; 4.5-5.9 Mo; 2.0-3.6 Cr; 0.2-0.5 Fe; Ti balance.
  • Ref RF Patent No. 2169204, Class C22C 14/00, published 2001.
  • the said alloy as-heat treated has high strength properties in heavy section forgings, but its ductility is insufficient and so the alloy cannot be used for production of such parts as coil springs.
  • the most close to the claimed invention is the metastable ⁇ -titanium alloy containing (mass %): 4-5 Fe; 4-7 Mo; 1-2 Al; O 2 up to 0.25; Ti balance.
  • Ref U.S. Pat. No. 5,294,267, Class C22C 14/00, published 1994. This alloy will be the prototype.
  • This alloy has high machinability, demands relatively low costs and is widely used for production of coil cylindrical springs in automotive industry.
  • the said alloy has low ductility properties, especially elongation, which reduces the application of this alloy and is of importance during manufacture of some types of coil springs and fastener components.
  • the object of this invention is to provide a titanium alloy with combination of high ductility and strength properties in as-heat treated condition, which can be produced using low cost alloying elements.
  • this alloy has higher content of aluminum than the prototype.
  • the content of aluminum of less than 3.5% does not significantly influence on the alloy ductility.
  • the contents of aluminum greater than 3.5% and iron greater than 3.8% increases the ⁇ -phase quantity, causes hardening and reduces ductility lower than desired.
  • the lower content of iron ( ⁇ 4%) than in the prototype ensures greater phase stability during thermal cycles (deformation and heat treatment); The desired strength properties cannot be achieved with aluminum below 1.5%.
  • the content of molybdenum below 4.5% and iron below 1.6% reduces ⁇ -phase quantity and does not allow to achieve high strength of the as-heat treated alloy.
  • Molybdenum is added as ferromolybdenum with 55-75% of molybdenum and iron balance.
  • Vanadium is added as ferrovanadium with 65-85% of vanadium and iron balance or Ti—Al—V system scrap.
  • ingots with the composition shown in Table 1 were melted in a vacuum arc furnace and 20 mm diameter bars were made from these ingots.
  • the bars were heat treated under the following conditions: heating to temperature of 30° C. below beta transus temperature, water cooling, heating to 480° C. for 8 hours, air cooling. Then tensile specimens were tested according to ASTM E 8.
  • the claimed metastable ⁇ -titanium alloy as compared to the known alloys has the specified optimal combination of beta and alpha stabilizing alloying elements, which ensure high strength and ductility of the as-heat treated alloy. It is low cost and can be used for production of a wide range of critical parts, especially fastener components and different coil springs.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Springs (AREA)
  • Heat Treatment Of Articles (AREA)
  • Ceramic Products (AREA)
  • Forging (AREA)

Abstract

Metastable β-titanium alloy contains, in mass %: from 1.5 to 3.5 aluminum; from 4.5 to 8.0 molybdenum; from 1.0 to 3.5 vanadium; from 1.5 to 3.8 iron; titanium balance. This alloy combines high strength and ductility. This allows to use it for production of a wide range of critical parts including fastener components and different coil springs (e.g. in automobile industry).

Description

    FIELD OF THE INVENTION
  • This invention relates to the non-ferrous metallurgy, and more particularly to the development of new titanium-base alloys combining high strength and ductility properties using relatively low-cost alloying elements. The alloys of this invention can be applied in a wide range of products especially fasteners and different coil springs.
    • PRIOR STATE OF ART
  • One of the known titanium alloys is the alloy containing (mass %): 2-6 Al; 6-9 Mo; 1-3 V; 0.5-2 Cr; 0-1.5 Fe; Ti balance. Ref: USSR Inventor's Certificate No. 180351, Class C22C 14/00, 1966.
  • However, this alloy has insufficient ductility due to the high content of Al and the presence of Cr. Besides this alloy is rather expensive.
  • The other known titanium alloy contains (mass %): 4-6.3 Al; 4.5-5.9 V; 4.5-5.9 Mo; 2.0-3.6 Cr; 0.2-0.5 Fe; Ti balance. Ref: RF Patent No. 2169204, Class C22C 14/00, published 2001.
  • The said alloy as-heat treated has high strength properties in heavy section forgings, but its ductility is insufficient and so the alloy cannot be used for production of such parts as coil springs.
  • The most close to the claimed invention is the metastable β-titanium alloy containing (mass %): 4-5 Fe; 4-7 Mo; 1-2 Al; O2 up to 0.25; Ti balance. Ref: U.S. Pat. No. 5,294,267, Class C22C 14/00, published 1994. This alloy will be the prototype.
  • This alloy has high machinability, demands relatively low costs and is widely used for production of coil cylindrical springs in automotive industry.
  • However, the said alloy has low ductility properties, especially elongation, which reduces the application of this alloy and is of importance during manufacture of some types of coil springs and fastener components.
    • DISCLOSURE OF THE INVENTION
  • The object of this invention is to provide a titanium alloy with combination of high ductility and strength properties in as-heat treated condition, which can be produced using low cost alloying elements.
  • In accordance with the invention this is achieved by addition of vanadium to the metastable β-titanium alloy containing aluminum, molybdenum and iron at the following content of components (mass %):
    Aluminum 1.5-3.5
    Molybdenum 4.5-8.0
    Vanadium 1.0-3.5
    Iron 1.6-3.8
    Titanium balance
  • The addition of 1.0-3.5% vanadium increases the alloy ductility as required.
  • To achieve high strength properties this alloy has higher content of aluminum than the prototype. The content of aluminum of less than 3.5% does not significantly influence on the alloy ductility. The contents of aluminum greater than 3.5% and iron greater than 3.8% increases the α-phase quantity, causes hardening and reduces ductility lower than desired. The lower content of iron (<4%) than in the prototype ensures greater phase stability during thermal cycles (deformation and heat treatment); The desired strength properties cannot be achieved with aluminum below 1.5%. The content of molybdenum below 4.5% and iron below 1.6% reduces β-phase quantity and does not allow to achieve high strength of the as-heat treated alloy.
  • The increase in the content of such β-stabilizers as molybdenum and vanadium exceeding the specified limits reduces the alloy stability in hardened and aged conditions and increases the grain size during heat treatment, which significantly reduces the alloy ductility (β<4%; Ψ<7%).
  • Molybdenum is added as ferromolybdenum with 55-75% of molybdenum and iron balance.
  • Vanadium is added as ferrovanadium with 65-85% of vanadium and iron balance or Ti—Al—V system scrap.
    • EMBODIMENTS OF THE INVENTION
  • To study the properties of the alloy, ingots with the composition shown in Table 1 were melted in a vacuum arc furnace and 20 mm diameter bars were made from these ingots. The bars were heat treated under the following conditions: heating to temperature of 30° C. below beta transus temperature, water cooling, heating to 480° C. for 8 hours, air cooling. Then tensile specimens were tested according to ASTM E 8.
  • Mechanical properties of the produced bars from the evaluated alloys are shown in Table 2.
    TABLE 1
    Element Content (wt %)
    Example Al Mo V Fe Ti
    1. 2.5 5.5 2.0 2.5 balance
    2. 3.0 6.5 3.0 3.5 balance
    3. 3.5 8.0 3.5 3.8 balance
  • TABLE 2
    Mechanical Properties
    Ultimate Yield Reduction
    Strength, Strength, Elongation of Area
    Example σB, MPa σ0.2, MPa δ, % ψ, %
    1. 1250 1190 20.2 46.4
    2. 1440 1390 6.1 10.2
    3. 1520 1480 4.9 7.3
    • Commercial Practicability
  • The claimed metastable β-titanium alloy as compared to the known alloys has the specified optimal combination of beta and alpha stabilizing alloying elements, which ensure high strength and ductility of the as-heat treated alloy. It is low cost and can be used for production of a wide range of critical parts, especially fastener components and different coil springs.

Claims (12)

1. A metastable β-titanium alloy containing aluminum, molybdenum, and iron, and vanadium, consisting essentially of (mass %):
Aluminum 1.5-3.5 Molybdenum 4.5-8.0 Vanadium 1.0-3.5 Iron 1.5-3.8 Titanium balance.
2. The alloy of claim 1 exhibiting a minimum percent reduction of area of 7.3 in a solution-treated condition.
3. The alloy of claim 1 exhibiting a yield strength of at least 1020 MPa.
4. A metastable β-titanium-base alloy consisting of (mass %):
Aluminum 1.5-3.5 Molybdenum 4.5-8.0 Vanadium 1.0-3.5 Iron 1.5-3.8
5. The alloy of claim 4 exhibiting a minimum percentage reduction of area of 7.3 in a solution-treated condition.
6. The alloy of claim 4 exhibiting a yield strength of at least 1020 MPa.
7. The alloy of claim 1 wherein the molybdenum is added as ferromolybdenum with 55-75% of molybdenum and a balance of iron.
8. The alloy of claim 1 wherein the vanadium is added as ferrovanadium with 65-80% of vanadium and a balance of iron.
9. The alloy of claim 1 wherein the vanadium is added as a Ti—Al—V system scrap.
10. The alloy of claim 4 wherein the molybdenum is added as ferromolybdenum with 55-75% of molybdenum and a balance of iron.
11. The alloy of claim 4 wherein the vanadium is added as ferrovanadium with 65-80% of vanadium and a balance of iron.
12. The alloy of claim 4 wherein the vanadium is added as a Ti—Al—V system scrap.
US10/496,493 2001-11-22 2002-11-18 Metastable beta-titanium alloy Abandoned US20060039819A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US12/069,496 US20080199350A1 (en) 2001-11-22 2008-02-11 Metastable beta-titanium alloy

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
RU2001131383/02A RU2211873C2 (en) 2001-11-22 2001-11-22 METASTABLE β-TITANIUM ALLOY
RU2001131383 2001-11-22
PCT/RU2002/000502 WO2003044234A1 (en) 2001-11-22 2002-11-18 Metastable $g(b)-titanium alloy

Related Child Applications (1)

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US12/069,496 Division US20080199350A1 (en) 2001-11-22 2008-02-11 Metastable beta-titanium alloy

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US (2) US20060039819A1 (en)
EP (1) EP1449929B1 (en)
AT (1) ATE326554T1 (en)
DE (1) DE60211548T2 (en)
DK (1) DK1449929T3 (en)
ES (1) ES2261754T3 (en)
HK (1) HK1066832A1 (en)
RU (1) RU2211873C2 (en)
WO (1) WO2003044234A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2020507683A (en) * 2017-01-25 2020-03-12 オックスフォード ユニバーシティ イノベーション リミテッドＯｘｆｏｒｄ Ｕｎｉｖｅｒｓｉｔｙ Ｉｎｎｏｖａｔｉｏｎ Ｌｉｍｉｔｅｄ Nickel-based alloy

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005052918A1 (en) * 2005-11-03 2007-05-16 Hempel Robert P Cold-formable Ti alloy
RU2425164C1 (en) 2010-01-20 2011-07-27 Открытое Акционерное Общество "Корпорация Всмпо-Ависма" Secondary titanium alloy and procedure for its fabrication
CN102586639A (en) * 2012-03-16 2012-07-18 广州有色金属研究院 Method for preparing titanium alloy through high-speed pressing formation

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5294267A (en) * 1992-12-04 1994-03-15 Titanium Metals Corporation Metastable beta titanium-base alloy
US5855697A (en) * 1997-05-21 1999-01-05 Imra America, Inc. Magnesium alloy having superior elevated-temperature properties and die castability

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU180351A1 (en) * 1965-01-06 1966-03-21 TITANIUM BASED ALLOY
US3615378A (en) * 1968-10-02 1971-10-26 Reactive Metals Inc Metastable beta titanium-base alloy
GB1333729A (en) * 1970-10-23 1973-10-17 Lockheed Aircraft Corp Titanium base alloy
DE3425055C1 (en) * 1984-07-07 1985-07-25 Daimler-Benz Ag, 7000 Stuttgart Getter substance
JP2737498B2 (en) * 1991-12-24 1998-04-08 日本鋼管株式会社 Titanium alloy for high density powder sintering
JP2803455B2 (en) * 1992-04-15 1998-09-24 日本鋼管株式会社 Manufacturing method of high density powder sintered titanium alloy
US5980655A (en) * 1997-04-10 1999-11-09 Oremet-Wah Chang Titanium-aluminum-vanadium alloys and products made therefrom
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
RU2269584C1 (en) * 2004-07-30 2006-02-10 Открытое Акционерное Общество "Корпорация Всмпо-Ависма" Titanium-base alloy
US20060045789A1 (en) * 2004-09-02 2006-03-02 Coastcast Corporation High strength low cost titanium and method for making same

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5294267A (en) * 1992-12-04 1994-03-15 Titanium Metals Corporation Metastable beta titanium-base alloy
US5855697A (en) * 1997-05-21 1999-01-05 Imra America, Inc. Magnesium alloy having superior elevated-temperature properties and die castability

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2020507683A (en) * 2017-01-25 2020-03-12 オックスフォード ユニバーシティ イノベーション リミテッドＯｘｆｏｒｄ Ｕｎｉｖｅｒｓｉｔｙ Ｉｎｎｏｖａｔｉｏｎ Ｌｉｍｉｔｅｄ Nickel-based alloy
JP7127061B2 (en) 2017-01-25 2022-08-29 オックスフォード ユニバーシティ イノベーション リミテッド Titanium-based alloy

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ATE326554T1 (en) 2006-06-15
DK1449929T3 (en) 2006-06-12
ES2261754T3 (en) 2006-11-16
WO2003044234A1 (en) 2003-05-30
EP1449929A4 (en) 2005-02-02
HK1066832A1 (en) 2005-04-01
DE60211548D1 (en) 2006-06-22
DE60211548T2 (en) 2006-09-14
US20080199350A1 (en) 2008-08-21
EP1449929B1 (en) 2006-05-17
RU2211873C2 (en) 2003-09-10
EP1449929A1 (en) 2004-08-25

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