EP2742162A1 - Geschmiedete tial-bauteile und verfahren zu ihrer herstellung - Google Patents
Geschmiedete tial-bauteile und verfahren zu ihrer herstellungInfo
- Publication number
- EP2742162A1 EP2742162A1 EP12762523.4A EP12762523A EP2742162A1 EP 2742162 A1 EP2742162 A1 EP 2742162A1 EP 12762523 A EP12762523 A EP 12762523A EP 2742162 A1 EP2742162 A1 EP 2742162A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- heat treatment
- temperature
- stage
- components
- minutes
- 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
Links
Classifications
-
- 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
- C22F1/183—High-melting or refractory metals or alloys based thereon of titanium 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
- F01D5/12—Blades
- F01D5/28—Selecting particular materials; Particular measures relating thereto; Measures against erosion or corrosion
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2300/00—Materials; Properties thereof
- F05D2300/10—Metals, alloys or intermetallic compounds
- F05D2300/17—Alloys
- F05D2300/174—Titanium alloys, e.g. TiAl
Definitions
- the present invention relates to a method for producing forged components from a TiAl alloy, in particular components for gas turbines, preferably aircraft turbines and in particular turbine blades for low-pressure turbines. Moreover, the present invention relates to corresponding components.
- titanium aluminides Due to their low specific weight and their mechanical properties, components of titanium aluminides are of interest for use in gas turbines, in particular aircraft turbines. However, in the case of titanium aluminide materials, the microstructures must be precisely adjusted in order to achieve the desired mechanical properties.
- the components are subjected to a two-stage heat treatment after forging, wherein the first stage of the heat treatment provides recrystallization annealing below the ⁇ / ⁇ transformation temperature for a period of 50 to 100 minutes.
- the annealing at a temperature below the ⁇ / ⁇ transformation temperature at which ⁇ -titanium is converted into ⁇ -TiAl in accordance with the phase diagram for the TiAl alloy used may take place as close as possible to the ⁇ / ⁇ transformation temperature, with a temperature of 15 ° C, in particular 10 ° C, below the ⁇ / ⁇ - conversion temperature should not fall below.
- the recrystallization annealing may preferably be carried out for 60 to 90 minutes, especially 70 to 80 minutes.
- the first stage of the heat treatment with the recrystallization annealing is followed by a second stage of the heat treatment with stabilizing annealing in the temperature range of 800 ° C to 950 ° C for 5 to 7 hours.
- the stabilization annealing can be carried out in particular in the temperature range from 825 ° C. to 925 ° C., preferably from 850 ° C. to 900 ° C., with a holding time of from 345 minutes to 375 minutes.
- the cooling in the recrystallization annealing can be carried out by air cooling, wherein in the temperature range between 1300 ° C and 900 ° C, the cooling rate> 3 ° C per second should be to set a fine lamellar structure of a 2 -Ti 3 AI and ⁇ -TiAl in the corresponding a 2 - and ⁇ -phase, which ensures the required mechanical properties.
- the cooling in the second heat treatment stage, so the stabilization annealing, can be done with correspondingly lower cooling rates in the oven.
- the heat treatment steps are carried out as accurately as possible at the corresponding selected temperature.
- an increasingly precise adjustment of the temperature and holding the components at the appropriate temperatures associated with increasing effort so that a compromise must be found for an economically meaningful processing.
- a temperature adjustment with a deviation in the range of 5 ° C to 10 ° C up and down from the target temperature has been found to be advantageous.
- the selected SolN temperature for the heat treatment steps of the present invention can be set and maintained in a corresponding temperature window of 5 ° C to 10 ° C deviation from the target temperature up and down.
- titanium-titanium aluminide alloys alloyed with niobium and molybdenum can be used in particular.
- Such alloys are also referred to as TNM alloys.
- an alloy of 42 to 45 atomic percent aluminum, 3 to 5 atomic percent niobium, and 0.5 to 1.5 atomic percent molybdenum may be used.
- the aluminum content may be selected in the range of 42.8 to 44.2 atomic percent aluminum, while 3.7 to 4.3 atomic percent of niobium and 0.8 to 1.2 atomic percent of molybdenum may be alloyed.
- the alloy may be alloyed with boron in the range of 0.05 to 0.15 atomic percent boron, more preferably 0.07 to 0.13 atomic percent boron.
- the alloy may contain unavoidable impurities or other constituents such as carbon, oxygen, nitrogen, hydrogen, chromium, silicon, iron, copper, nickel and yttrium, the content of which being ⁇ 0.05% by weight of chromium, ⁇ 0.05% by weight of silicon, ⁇ 0.08 weight percent oxygen, ⁇ 0.02 weight percent carbon, ⁇ 0.015 weight percent nitrogen, ⁇ 0.005 weight percent hydrogen, ⁇ 0.06 weight percent iron, ⁇ 0.15 weight percent copper, ⁇ 0.02 weight percent nickel and ⁇ 0.001 weight percent yttrium , Further constituents may be contained individually in the range of 0 to 0.05 percent by weight or in total from 0 to 0.2 percent by weight.
- the forging of the corresponding components can be carried out by drop forging in the ⁇ - ⁇ - ⁇ temperature range, wherein as a raw material for forging cast and / or hot isostatically pressed blanks can be used.
- the blanks themselves can be produced by melting in vacuum or inert gas withsverzehreri- the electrodes or in the cooled crucible by plasma arc melting, wherein a single or multiple remelting of the alloy can be performed.
- Remelting may be by vacuum induction melting or vacuum arc remelting (VIM vacuum induction melting) and the poured material may be hot isostatically pressed, with temperatures> 200 ° C at a pressure> 190 MPa and a holding time> 4 hours can be applied.
- a component made of a TiAl alloy in particular a component of a gas turbine, preferably an aircraft turbine, which is produced in particular according to the above-described method, is provided which has a triplex structure with a globulitic ⁇ -TiAl phase, a B2-TiAl Phase (cubic body-centered phase) and a lamellar a 2 -Ti 3 Al and ⁇ -TiAl phase is constructed.
- the proportion of the ⁇ -phase is in this case 2 to 20 percent by volume, the proportion of the B2 phase 1 to 20 percent by volume and the proportion of the ⁇ -phase together with the B2 phase 5 to 25 percent by volume.
- the proportion of the ⁇ -phase 5 to 15 volume percent and the proportion of B2 phase 3 to 15 volume percent and the proportion of the two phases together amount to 8 to 20 volume percent.
- the size of the ⁇ -phase or the ⁇ -grains can be adjusted so that a circumscribed circle has a diameter ⁇ 40 ⁇ . The same applies to the B2 phase or B2 grains.
- the lamellar microstructures of a 2 and ⁇ phase have a size at which the equivalent area of a circle has a diameter of ⁇ 100 ⁇ .
- the aspect ratio of the lamellar a 2 and ⁇ phase ie the ratio of the length to the width of the lamellae, can be ⁇ 3: 1.
- the structure may additionally have borides.
- the thus molten material was hot isostatically compacted at a temperature of> 1200 ° C and a pressure of greater than 190 MPa for a holding time of more than 4 hours, and then forged in a die forging at a temperature in the ⁇ - ⁇ - ⁇ phase region , Thereafter, a heat treatment with recrystallization annealing below the ⁇ / ⁇ transformation temperature for 75 minutes was performed with air cooling at a cooling rate. above 3 ° C per second. Subsequently, the corresponding component was subjected to stabilization annealing at 920 ° C. for 6 hours and then cooled in the oven.
- Such a component such as a turbine blade for a low-pressure turbine in an aircraft engine, has a triplex structure according to the invention with corresponding proportions of ⁇ phase, B2 phase and lamellar a 2 and ⁇ phase.
- Such a component has a yield strength (0.2% proof strength Rpo, 2) of more than 670 MPa and a tensile strength R m of more than 840 MPa for a total elongation (elastic and plastic elongation to breakage) in a tensile test at 300 ° C. A tot of more than 1, 7% up.
- a yield strength R p o > 2 of more than 500 MPa and a tensile strength R ",> 730 MPa are still achieved.
- the creep properties are characterized at a creep temperature of 750 ° C and a test voltage of 150 MPa and a creep of more than 200 hours by a total plastic strain A p of ⁇ 1%.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- General Engineering & Computer Science (AREA)
- Forging (AREA)
- Turbine Rotor Nozzle Sealing (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102011110740.5A DE102011110740B4 (de) | 2011-08-11 | 2011-08-11 | Verfahren zur Herstellung geschmiedeter TiAl-Bauteile |
| PCT/DE2012/000804 WO2013020548A1 (de) | 2011-08-11 | 2012-08-09 | Geschmiedete tial-bauteile und verfahren zu ihrer herstellung |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP2742162A1 true EP2742162A1 (de) | 2014-06-18 |
| EP2742162B1 EP2742162B1 (de) | 2015-10-07 |
Family
ID=46924179
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP12762523.4A Active EP2742162B1 (de) | 2011-08-11 | 2012-08-09 | Verfahren zu herstellung von geschmiedeten tial-bauteilen |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US20140202601A1 (de) |
| EP (1) | EP2742162B1 (de) |
| DE (1) | DE102011110740B4 (de) |
| ES (1) | ES2553439T3 (de) |
| WO (1) | WO2013020548A1 (de) |
Families Citing this family (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ES2747155T3 (es) | 2013-09-20 | 2020-03-10 | MTU Aero Engines AG | Aleación de TiAl resistente a la fluencia |
| DE102013020460A1 (de) * | 2013-12-06 | 2015-06-11 | Hanseatische Waren Handelsgesellschaft Mbh & Co. Kg | Verfahren zur Herstellung von TiAl-Bauteilen |
| CN103993248B (zh) * | 2014-06-20 | 2016-12-07 | 南昌航空大学 | 使tc21合金两相区超塑性变形后获得网篮组织的热处理工艺 |
| CN104264012A (zh) * | 2014-09-30 | 2015-01-07 | 西北有色金属研究院 | 一种含钼高铌β型γ-TiAl合金铸锭及其制备方法 |
| DE102015103422B3 (de) | 2015-03-09 | 2016-07-14 | LEISTRITZ Turbinentechnik GmbH | Verfahren zur Herstellung eines hochbelastbaren Bauteils aus einer Alpha+Gamma-Titanaluminid-Legierung für Kolbenmaschinen und Gasturbinen, insbesondere Flugtriebwerke |
| CN105220096B (zh) * | 2015-11-04 | 2017-03-08 | 哈尔滨工业大学 | 一种改善传统铸造γ‑TiAl合金力学性能的多步循环热处理方法 |
| US20180010213A1 (en) * | 2016-07-07 | 2018-01-11 | United Technologies Corporation | Enhance ductility of gamma titanium aluminum alloys by reducing interstitial contents |
| US20180010468A1 (en) * | 2016-07-07 | 2018-01-11 | United Technologies Corporation | Enhanced temperature capability gamma titanium aluminum alloys |
| JP6687118B2 (ja) * | 2016-09-02 | 2020-04-22 | 株式会社Ihi | TiAl合金及びその製造方法 |
| DE102016224386A1 (de) * | 2016-12-07 | 2018-06-07 | MTU Aero Engines AG | Verfahren zum herstellen einer schaufel für eine strömungsmaschine |
| ES2753242T3 (es) | 2017-03-10 | 2020-04-07 | MTU Aero Engines AG | Procedimiento para fabricar componentes de TiAl forjados |
| DE102017212082A1 (de) | 2017-07-14 | 2019-01-17 | MTU Aero Engines AG | Schmieden bei hohen temperaturen, insbesondere von titanaluminiden |
| CN109500331B (zh) * | 2018-11-02 | 2020-03-17 | 湖南金天钛业科技有限公司 | Tc25钛合金大规格棒材加工方法 |
| US20240043978A1 (en) * | 2021-04-16 | 2024-02-08 | Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.) | Tial alloy for forging, tial alloy material, and method for producing tial alloy material |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5558729A (en) * | 1995-01-27 | 1996-09-24 | The United States Of America As Represented By The Secretary Of The Air Force | Method to produce gamma titanium aluminide articles having improved properties |
| DE19756354B4 (de) * | 1997-12-18 | 2007-03-01 | Alstom | Schaufel und Verfahren zur Herstellung der Schaufel |
| AT2881U1 (de) * | 1998-06-08 | 1999-06-25 | Plansee Ag | Verfahren zur herstellung eines tellerventiles aus gamma-tial-basislegierungen |
| DE102007051499A1 (de) * | 2007-10-27 | 2009-04-30 | Mtu Aero Engines Gmbh | Werkstoff für ein Gasturbinenbauteil, Verfahren zur Herstellung eines Gasturbinenbauteils sowie Gasturbinenbauteil |
| DE102007060587B4 (de) * | 2007-12-13 | 2013-01-31 | Helmholtz-Zentrum Geesthacht Zentrum für Material- und Küstenforschung GmbH | Titanaluminidlegierungen |
| US8876992B2 (en) * | 2010-08-30 | 2014-11-04 | United Technologies Corporation | Process and system for fabricating gamma TiAl turbine engine components |
-
2011
- 2011-08-11 DE DE102011110740.5A patent/DE102011110740B4/de not_active Withdrawn - After Issue
-
2012
- 2012-08-09 EP EP12762523.4A patent/EP2742162B1/de active Active
- 2012-08-09 US US14/237,929 patent/US20140202601A1/en not_active Abandoned
- 2012-08-09 WO PCT/DE2012/000804 patent/WO2013020548A1/de not_active Ceased
- 2012-08-09 ES ES12762523.4T patent/ES2553439T3/es active Active
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2013020548A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2013020548A1 (de) | 2013-02-14 |
| WO2013020548A8 (de) | 2013-07-18 |
| DE102011110740B4 (de) | 2017-01-19 |
| EP2742162B1 (de) | 2015-10-07 |
| DE102011110740A1 (de) | 2013-02-14 |
| US20140202601A1 (en) | 2014-07-24 |
| ES2553439T3 (es) | 2015-12-09 |
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