EP2453029A1 - Procédé pour modifier les propriétés thermiques et électriques dýalliages de titane à plusieurs composants - Google Patents

Procédé pour modifier les propriétés thermiques et électriques dýalliages de titane à plusieurs composants Download PDF

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Publication number
EP2453029A1
EP2453029A1 EP11172128A EP11172128A EP2453029A1 EP 2453029 A1 EP2453029 A1 EP 2453029A1 EP 11172128 A EP11172128 A EP 11172128A EP 11172128 A EP11172128 A EP 11172128A EP 2453029 A1 EP2453029 A1 EP 2453029A1
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EP
European Patent Office
Prior art keywords
titanium alloy
approximately
boron
tib
forging
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.)
Withdrawn
Application number
EP11172128A
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German (de)
English (en)
Inventor
Seshacharyulu Tamirisakandala
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.)
FMW Composite Systems Inc
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FMW Composite Systems Inc
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Filing date
Publication date
Application filed by FMW Composite Systems Inc filed Critical FMW Composite Systems Inc
Publication of EP2453029A1 publication Critical patent/EP2453029A1/fr
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/16—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of other metals or alloys based thereon
    • C22F1/18—High-melting or refractory metals or alloys based thereon
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D21/00—Casting non-ferrous metals or metallic compounds so far as their metallurgical properties are of importance for the casting procedure; Selection of compositions therefor
    • B22D21/06—Casting non-ferrous metals with a high melting point, e.g. metallic carbides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/10—Sintering only
    • B22F3/1039—Sintering only by reaction
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C1/00—Making non-ferrous alloys
    • C22C1/04—Making non-ferrous alloys by powder metallurgy
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C1/00—Making non-ferrous alloys
    • C22C1/04—Making non-ferrous alloys by powder metallurgy
    • C22C1/045—Alloys based on refractory metals
    • C22C1/0458—Alloys based on titanium, zirconium or hafnium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C32/00—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ
    • C22C32/001—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ with only oxides
    • C22C32/0015—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ with only oxides with only single oxides as main non-metallic constituents
    • C22C32/0031—Matrix based on refractory metals, W, Mo, Nb, Hf, Ta, Zr, Ti, V or alloys thereof
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C32/00—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ
    • C22C32/0047—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ with carbides, nitrides, borides or silicides as the main non-metallic constituents
    • C22C32/0073—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ with carbides, nitrides, borides or silicides as the main non-metallic constituents only borides

Definitions

  • the present invention relates to a method of improving physical properties of titanium alloys and, more specifically, a method of increasing thermal conductivity and reducing electrical resistivity of articles made of titanium-based compositions.
  • Titanium alloys offer attractive physical and mechanical property combinations that provide significant weight savings in various industries such as aerospace and space. Thermal conductivity of titanium alloys, however, is low compared to other structural metals such as steel and aluminum. Low thermal conductivity of titanium alloys affects heating rates and obtainable cooling rates after processing and heat treatments. Another drawback of titanium alloys is their high electrical resistivity compared to steel and aluminum. High electrical resistivity limits the use of titanium alloys as electrical conductors. There is a need, therefore, for a new and improved method of increasing thermal conductivity and reducing electrical resistivity of conventional titanium alloys such as Ti-6AI-4V without debits in mechanical properties, specifically tensile elongation and fatigue. The method of the present invention meets this need.
  • titanium boride (TiB) precipitates are incorporated into a titanium alloy and the alloy is then subjected to controlled deformation to orient the TiB precipitates in the direction of interest to achieve improvements in thermal and electrical properties.
  • the controlled deformation of the alloy to orient the TiB precipitates is accomplished by hot metalworking.
  • the boron is introduced into the titanium alloy composition to produce TiB precipitates by any suitable method, such as casting, cast-and-wrought processing, powder metallurgy techniques such as gas atomization and blended elemental approach. Hot metalworking operations such as forging, rolling and extrusion can be used to accomplish alignment of the TiB precipitates along the direction of metal flow.
  • the method of the present invention may be used to increase thermal conductivity and reduce electrical resistivity of multi-component titanium alloys such as Ti-6AI-4V (Ti-64) and Ti-6Al-2Sn-4Zr-2Mo(Ti-6242).
  • multi-component titanium alloys such as Ti-6AI-4V (Ti-64) and Ti-6Al-2Sn-4Zr-2Mo(Ti-6242).
  • Ti-6AI-4V Ti-64
  • Ti-6Al-2Sn-4Zr-2Mo Ti-6242
  • boron into the titanium alloy composition to produce TiB precipitates can be accomplished by several different methods, such as casting, cast-and-wrought processing, powder metallurgy techniques such as gas atomization and blended elemental approach.
  • the boron may be added to the titanium alloy in the liquid state, wherein the boron is completely dissolved in the liquid titanium alloy.
  • the boron may be added to the titanium alloy through intermixing of solid powders, as by powder metallurgy. Regardless of the process used to add the boron to the titanium alloy, the boron may be added as elemental boron, TiB2 or as any appropriate master alloy containing boron.
  • the boron may be added in amounts in the range from 0.01 % to 18.4%, by weight. More preferably, the boron is added to the titanium alloy in amounts ranging from 0.01% to 2%, by weight, depending on titanium alloy composition.
  • Hot metalworking operations such as forging, rolling, and extrusion can be used to accomplish alignment of TiB precipitates along the direction of metal flow.
  • the present method can be practiced by the gas atomization powder metallurgy process flowchart shown in Figure 1 .
  • the boron is added to the molten titanium alloy and the liquid melt is inert gas atomized to obtain titanium alloy powder.
  • Each powder particle contains needle-shaped TiB precipitates distributed uniformly and in random orientations.
  • An example microstructure of Ti-6AI-4V-1B powder particle cross-section which contains 6 vol. % of TiB (dark phase) is shown in Figure 2a .
  • Titanium alloy powder is consolidated using a conventional technique such as hot isostatic pressing (HIP) to obtain a fully dense powder compact. In as-compacted condition, the TiB precipitates are still in random orientations distributed uniformly in the titanium alloy matrix.
  • An example microstructure of Ti-6A1-4V-1B powder after HIP is shown in Figure 2b .
  • Hot working parameters commonly practiced for producing titanium alloy articles were found to produce the desired alignment of TiB precipitates along the direction of metal flow.
  • the hot working parameters are as follows:
  • Thermal conductivity of Ti-64-1B (labeled as nano Ti-64) forging and extrusion articles is compared with that of Ti-64 article in Figure 5 .
  • Higher thermal conductivity of nano Ti-64 forging in the radial orientation and nano Ti-64 extrusion in the axial orientation is evident compared to the baseline Ti-64 in the temperature range 70-1250°F.
  • Thermal conductivity data of Ti-6242-1B forging article is compared with that of the baseline Ti-6242 article in Figure 6 . Increased thermal conductivity compared to the baseline is evident in this material system also. Increase in thermal conductivity by up to 35% was recorded in articles with the TiB precipitates aligned along the test direction.
  • Ti-64-1B (labeled as nano Ti-64) forging article is compared with that of Ti-64 article in Figure 7 .
  • Reduced electrical resistivity of nano Ti-64 forging in the radial orientation compared to the baseline Ti-64 in the temperature range 70-1500°F is evident.
  • Electrical resistivity data of Ti-6242-1B forging article is compared with that of the baseline Ti-6242 article in Figure 8 .
  • Reduced electrical resistivity compared to the baseline is evident in this material system also. Reduction in thermal conductivity by up to 20% was recorded in articles with the TiB precipitates aligned along the test direction.
  • TiB incorporated titanium alloys offer several benefits in mechanical properties without debits in ductility and fatigue.
  • room temperature tensile properties of boron-modified titanium alloy articles (referred to as nano version) are compared with those of baseline titanium alloys in Table 2.
  • the tensile yield strength and ultimate strength were higher by 25%, modulus of elasticity is higher by 20%, while maintaining tensile elongations equivalent to their baseline titanium alloys.
  • Table 2 Typical room temperature tensile properties of boron-modified titanium alloy articles referred to as nano alloys.
  • TYS Tensile Yield Strength
  • UTS Ultimate Tensile Strength
  • TE Tensile Elongation
  • TM Tensile Modulus (modulus of elasticity in tension).
  • 1 Ti-64 Bar Axial 120 130 13 16.9
  • Nano Ti-64 Forging Radial 140 154 13 18.6 3 Nano Ti-64 Extrusion Axial 152 163 10 19.9 4
  • Ti-6242 Bar Axial 131 141 13 16.5 5 Nano Ti-6242 Forging Radial 161 170 9 19.1

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Powder Metallurgy (AREA)
  • Manufacture Of Metal Powder And Suspensions Thereof (AREA)
EP11172128A 2010-11-12 2011-06-30 Procédé pour modifier les propriétés thermiques et électriques dýalliages de titane à plusieurs composants Withdrawn EP2453029A1 (fr)

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US12/923,056 US20120118433A1 (en) 2010-11-12 2010-11-12 Method of modifying thermal and electrical properties of multi-component titanium alloys

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EP2453029A1 true EP2453029A1 (fr) 2012-05-16

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US (1) US20120118433A1 (fr)
EP (1) EP2453029A1 (fr)
JP (1) JP2012102394A (fr)
KR (1) KR20120051572A (fr)
CN (1) CN102465217A (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109722565A (zh) * 2019-01-10 2019-05-07 青海聚能钛金属材料技术研究有限公司 耐高温钛合金及其制备方法和应用
CN109722564A (zh) * 2019-01-10 2019-05-07 青海聚能钛金属材料技术研究有限公司 Ti-6242钛合金及其制备方法

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5520879A (en) * 1990-11-09 1996-05-28 Kabushiki Kaisha Toyota Chuo Kenkyusho Sintered powdered titanium alloy and method of producing the same
WO2005060631A2 (fr) * 2003-12-11 2005-07-07 Ohio University Procede d'affinage microstructurel d'alliage de titane et formation superplastique a vitesse de deformation elevee et haute temperature d'alliages de titane
US20060016521A1 (en) * 2004-07-22 2006-01-26 Hanusiak William M Method for manufacturing titanium alloy wire with enhanced properties
US20070286761A1 (en) * 2006-06-07 2007-12-13 Miracle Daniel B Method of producing high strength, high stiffness and high ductility titanium alloys

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5520879A (en) * 1990-11-09 1996-05-28 Kabushiki Kaisha Toyota Chuo Kenkyusho Sintered powdered titanium alloy and method of producing the same
WO2005060631A2 (fr) * 2003-12-11 2005-07-07 Ohio University Procede d'affinage microstructurel d'alliage de titane et formation superplastique a vitesse de deformation elevee et haute temperature d'alliages de titane
US20060016521A1 (en) * 2004-07-22 2006-01-26 Hanusiak William M Method for manufacturing titanium alloy wire with enhanced properties
US20070286761A1 (en) * 2006-06-07 2007-12-13 Miracle Daniel B Method of producing high strength, high stiffness and high ductility titanium alloys

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
TAMIRISAKANDALA S ET AL: "Effect of boron on the beta transus of Ti 6Al 4V alloy", SCRIPTA MATERIALIA, ELSEVIER, AMSTERDAM, NL, vol. 53, no. 2, 1 July 2005 (2005-07-01), pages 217 - 222, XP002570257, ISSN: 1359-6462, [retrieved on 20050420], DOI: 10.1016/J.SCRIPTAMAT.2005.03.038 *
TAMIRISAKANDALA S ET AL: "Powder Metallurgy Ti-6Al-4VxB Alloys: Processing, Microstructure and Properties", J O M, SPRINGER NEW YORK LLC, UNITED STATES, vol. 56, no. 5, 1 May 2004 (2004-05-01), pages 60 - 63, XP002570256, ISSN: 1047-4838, [retrieved on 20070628], DOI: 10.1007/S11837-004-0131-5 *

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JP2012102394A (ja) 2012-05-31
KR20120051572A (ko) 2012-05-22
CN102465217A (zh) 2012-05-23
US20120118433A1 (en) 2012-05-17

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