EP1195445B1 - Alliage du type aluminure de titane contenant du bore, du silicium et du tungstène - Google Patents

Alliage du type aluminure de titane contenant du bore, du silicium et du tungstène Download PDF

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Publication number
EP1195445B1
EP1195445B1 EP01123551A EP01123551A EP1195445B1 EP 1195445 B1 EP1195445 B1 EP 1195445B1 EP 01123551 A EP01123551 A EP 01123551A EP 01123551 A EP01123551 A EP 01123551A EP 1195445 B1 EP1195445 B1 EP 1195445B1
Authority
EP
European Patent Office
Prior art keywords
alloy
rest
alloys
tungsten
silicon
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
Application number
EP01123551A
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German (de)
English (en)
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EP1195445A1 (fr
Inventor
Mohamed Dr. Nazmy
Markus Staubli
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.)
General Electric Switzerland GmbH
Original Assignee
Alstom Schweiz AG
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 Alstom Schweiz AG filed Critical Alstom Schweiz AG
Publication of EP1195445A1 publication Critical patent/EP1195445A1/fr
Application granted granted Critical
Publication of EP1195445B1 publication Critical patent/EP1195445B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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 a high temperature alloy for thermal Machines based on intermetallic compounds which are suitable for Investment casting and directional solidification are suitable and the conventional nickel-base superalloys complete.
  • Titanium intermetallic compounds with aluminum have some interesting properties, which they use as construction materials in the middle and higher temperature range appear attractive. This includes among other things their compared to superalloys lower density. Of their technical usability in its present form but is their brittleness opposite. This can be improved by certain additives.
  • the heat resistance of the known aluminides leaves much to be desired. According to the comparatively low melting point of these materials the strength, in particular the creep resistance, in the upper temperature range insufficient.
  • the invention seeks to further extend this known high temperature alloy improve. It is the object of the invention, a light alloy with improved heat resistance and ductility at high temperatures (in the range from 600 to 1000 ° C) and a good oxidation and corrosion resistance which is well suited for directional solidification or investment casting and in consists essentially of a refractory intermetallic compound.
  • the core of the invention is compared to the known alloys on the one hand the reduced AI content, on the other hand the possibility of a much higher B content to realize.
  • the advantages of the invention are that it is due to the combination of mentioned alloying elements, but in particular by the higher B contents manages, on the one hand, a very fine grain both thin and large cross sections and thus the toughness and the Creep resistance increase, and on the other hand, a good oxidation resistance to achieve.
  • the lowering of the Al content in comparison to the known state The technique increases the strength, but at the same time favors the Grain coarsening. Boron, on the other hand, stabilizes the grain boundaries, ie. H. the higher ones Boron contents reduce coarsening.
  • alloys of the following composition were melted under argon as protective gas, L1, L2, L3 and L4 alloys according to the invention and V1 and V2 representing comparative alloys: alloy Ti al W Si B L1 rest 45 2 0.40 1.8 L2 rest 45 2 0.47 2.5 L2 rest 45 1.9 0.46 3.5 L4 rest 44.9 1.9 0.46 4.0 V1 rest 46 2 0.48 0.7 V2 rest 47 2 0.50 0
  • the starting materials used were the individual elements with a degree of purity from 99.99%.
  • the melt was in each case to a casting blank of about 50 mm Diameter and poured about 70 mm height. These blanks were under Inert gas again melted and also under inert gas to solidify in the form of rods with about 9 mm diameter and about 70 mm in length forced. These bars were given a HIP (HOT ISOSTATIC PRESSING) and Subjected to heat treatment and then processed into tensile specimens.
  • the HIP treatment was carried out for 4 hours at a temperature of 1260 ° C and a pressure of 172 MPa.
  • the heat treatment was carried out under protective gas following parameters: 1350 ° C / 1 h + 1000 ° C / 6 h.
  • FIGS. 1 to 6 show the microstructure of the alloys L1, L2, L3, L4 as well as V1 and V2.
  • the Microstructure of the Alloys L1, L2, L3 and L4 According to the Invention is considerably finer-grained than the microstructure of the comparative alloy V1 (FIG. 5), which is alloyed with lower B contents or than the comparative alloy VL2, which contains no boron.
  • FIG. 7 shows a diagram of the alloys L1, L2 and L3 according to the invention and the comparative alloys V1 and V2 the hardness values as a function of Boron content.
  • the alloys L1, L2 and L3 show a greater hardness than the comparative alloys. Particularly good hardness values achieved Inventive alloy L1 with 1.8 at.% boron.
  • the field of application of the modified titanium aluminides advantageously extends to a temperature range between 600 and 1000 ° C.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)

Claims (2)

  1. Alliage à haute température pour un composant subissant de fortes sollicitations mécaniques dans une machine, lequel alliage est à base de TiAl allié dont la composition (en % atomiques) est la suivante :
    Al 44,5 à <46
    W 1 à 3
    Si 0,4 à 1
    B 1 à 4,
    le solde étant du Ti et des impuretés qui découlent de sa préparation.
  2. Alliage à haute température selon la revendication 1, dont la composition (en % atomiques) est la suivante :
    Al 45
    W 2
    Si 0,5
    B 2,
    le solde étant du Ti et des impuretés qui découlent de sa préparation.
EP01123551A 2000-10-04 2001-10-01 Alliage du type aluminure de titane contenant du bore, du silicium et du tungstène Expired - Lifetime EP1195445B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10049026 2000-10-04
DE10049026A DE10049026A1 (de) 2000-10-04 2000-10-04 Hochtemperaturlegierung

Publications (2)

Publication Number Publication Date
EP1195445A1 EP1195445A1 (fr) 2002-04-10
EP1195445B1 true EP1195445B1 (fr) 2004-02-11

Family

ID=7658584

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01123551A Expired - Lifetime EP1195445B1 (fr) 2000-10-04 2001-10-01 Alliage du type aluminure de titane contenant du bore, du silicium et du tungstène

Country Status (3)

Country Link
US (1) US6676897B2 (fr)
EP (1) EP1195445B1 (fr)
DE (2) DE10049026A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109280786B (zh) * 2018-11-22 2020-06-02 河北四通新型金属材料股份有限公司 一种铝钨中间合金及其生产方法

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3203794A (en) 1957-04-15 1965-08-31 Crucible Steel Co America Titanium-high aluminum alloys
US4842820A (en) * 1987-12-28 1989-06-27 General Electric Company Boron-modified titanium aluminum alloys and method of preparation
US4983357A (en) 1988-08-16 1991-01-08 Nkk Corporation Heat-resistant TiAl alloy excellent in room-temperature fracture toughness, high-temperature oxidation resistance and high-temperature strength
US5045406A (en) 1989-06-29 1991-09-03 General Electric Company Gamma titanium aluminum alloys modified by chromium and silicon and method of preparation
DE59106459D1 (de) * 1990-05-04 1995-10-19 Asea Brown Boveri Hochtemperaturlegierung für Maschinenbauteile auf der Basis von dotiertem Titanaluminid.
US5370839A (en) * 1991-07-05 1994-12-06 Nippon Steel Corporation Tial-based intermetallic compound alloys having superplasticity
US5226985A (en) * 1992-01-22 1993-07-13 The United States Of America As Represented By The Secretary Of The Air Force Method to produce gamma titanium aluminide articles having improved properties
US5328530A (en) * 1993-06-07 1994-07-12 The United States Of America As Represented By The Secretary Of The Air Force Hot forging of coarse grain alloys
USH1659H (en) * 1995-05-08 1997-07-01 The United States Of America As Represented By The Secretary Of The Air Force Method for heat treating titanium aluminide alloys
US5653828A (en) * 1995-10-26 1997-08-05 National Research Council Of Canada Method to procuce fine-grained lamellar microstructures in gamma titanium aluminides
US5908516A (en) * 1996-08-28 1999-06-01 Nguyen-Dinh; Xuan Titanium Aluminide alloys containing Boron, Chromium, Silicon and Tungsten
DE19756354B4 (de) * 1997-12-18 2007-03-01 Alstom Schaufel und Verfahren zur Herstellung der Schaufel
DE19933633A1 (de) * 1999-07-17 2001-01-18 Abb Alstom Power Ch Ag Hochtemperaturlegierung

Also Published As

Publication number Publication date
DE10049026A1 (de) 2002-04-11
US20030124021A1 (en) 2003-07-03
EP1195445A1 (fr) 2002-04-10
DE50101467D1 (de) 2004-03-18
US6676897B2 (en) 2004-01-13

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