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EP1449929A1 - Metastable beta-titanium alloy - Google Patents

Metastable beta-titanium alloy Download PDF

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Publication number
EP1449929A1
EP1449929A1 EP02783880A EP02783880A EP1449929A1 EP 1449929 A1 EP1449929 A1 EP 1449929A1 EP 02783880 A EP02783880 A EP 02783880A EP 02783880 A EP02783880 A EP 02783880A EP 1449929 A1 EP1449929 A1 EP 1449929A1
Authority
EP
European Patent Office
Prior art keywords
alloy
titanium alloy
ductility
balance
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.)
Granted
Application number
EP02783880A
Other languages
German (de)
French (fr)
Other versions
EP1449929B1 (en
EP1449929A4 (en
Inventor
Vladislav Valentinovich Tetyukhin
Igor Vasilievich Levin
Denis Valeryevich Sosnovsky
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
VSMPO Avisma Corp PSC
Original Assignee
Otkrytoe Aktsionernoe Obschestvo Verkhnesaldinskoe Metallurgicheskoe Proizvodstvennoe Obiedinenie (Oao Vsmpo)
Borovichsky Kombinat Ogneuporov OAO
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Otkrytoe Aktsionernoe Obschestvo Verkhnesaldinskoe Metallurgicheskoe Proizvodstvennoe Obiedinenie (Oao Vsmpo), Borovichsky Kombinat Ogneuporov OAO filed Critical Otkrytoe Aktsionernoe Obschestvo Verkhnesaldinskoe Metallurgicheskoe Proizvodstvennoe Obiedinenie (Oao Vsmpo)
Publication of EP1449929A1 publication Critical patent/EP1449929A1/en
Publication of EP1449929A4 publication Critical patent/EP1449929A4/en
Application granted granted Critical
Publication of EP1449929B1 publication Critical patent/EP1449929B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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 US Patent No. 5,294,267,2 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 1.5% 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. Mechanical properties of the produced bars from the evaluated alloys are shown in Table 2.
  • 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 beta -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: US Patent No. 5,294,267,2 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 1.5-3.8
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 1.5% 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.
Example Element Content (wt %)
Al Mo V Fe Ti
1 1.5 4.5 1.0 1.5 balance
2 2.5 5.5 2.0 2.5 balance
3 3.0 6.5 3.0 3.5 balance
4 3.5 8.0 3.5 3.8 balance
Example Mechanical Properties
Ultimate Strength,
σB, MPa		 Yield Strength,
σ0.2, MPa		 Elongation
δ, %		 Reduction of Area
Ψ, %
1 1100 1020 25.1 58.7
2 1250 1190 20.2 46.4
3 1440 1390 6.1 10.2
4 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 (1)

  1. Metastable β-titanium alloy containing aluminum, molybdenum and iron, wherein it additionally contains vanadium, at the following content of components (mass %): Aluminum 1.5 - 3.5 Molybdenum 4.5 - 8.0 Vanadium 1.0 - 3.5 Iron 1.5 - 3.8 Titanium balance
EP02783880A 2001-11-22 2002-11-18 Metastable beta-titanium alloy Expired - Lifetime EP1449929B1 (en)

Applications Claiming Priority (3)

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

Publications (3)

Publication Number Publication Date
EP1449929A1 true EP1449929A1 (en) 2004-08-25
EP1449929A4 EP1449929A4 (en) 2005-02-02
EP1449929B1 EP1449929B1 (en) 2006-05-17

Family

ID=20254397

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02783880A Expired - Lifetime EP1449929B1 (en) 2001-11-22 2002-11-18 Metastable beta-titanium alloy

Country Status (8)

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

Families Citing this family (4)

* 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
GB201701251D0 (en) * 2017-01-25 2017-03-08 Univ Oxford Innovation Ltd A titanium-based alloy

Family Cites Families (12)

* 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
US5294267A (en) * 1992-12-04 1994-03-15 Titanium Metals Corporation Metastable beta titanium-base alloy
US5980655A (en) * 1997-04-10 1999-11-09 Oremet-Wah Chang Titanium-aluminum-vanadium alloys and products made therefrom
US5855697A (en) * 1997-05-21 1999-01-05 Imra America, Inc. Magnesium alloy having superior elevated-temperature properties and die castability
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

Also Published As

Publication number Publication date
US20060039819A1 (en) 2006-02-23
RU2211873C2 (en) 2003-09-10
ATE326554T1 (en) 2006-06-15
ES2261754T3 (en) 2006-11-16
US20080199350A1 (en) 2008-08-21
EP1449929B1 (en) 2006-05-17
DE60211548T2 (en) 2006-09-14
HK1066832A1 (en) 2005-04-01
DK1449929T3 (en) 2006-06-12
WO2003044234A1 (en) 2003-05-30
EP1449929A4 (en) 2005-02-02
DE60211548D1 (en) 2006-06-22

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