EP0948658A1 - TiAl ALLOY AND ITS USE - Google Patents

TiAl ALLOY AND ITS USE

Info

Publication number
EP0948658A1
EP0948658A1 EP97948908A EP97948908A EP0948658A1 EP 0948658 A1 EP0948658 A1 EP 0948658A1 EP 97948908 A EP97948908 A EP 97948908A EP 97948908 A EP97948908 A EP 97948908A EP 0948658 A1 EP0948658 A1 EP 0948658A1
Authority
EP
European Patent Office
Prior art keywords
tial alloy
mpa
alloy
room temperature
tial
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
EP97948908A
Other languages
German (de)
French (fr)
Other versions
EP0948658B1 (en
Inventor
Georg Dr. Frommeyer
Jürgen Wesemann
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Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP0948658A1 publication Critical patent/EP0948658A1/en
Application granted granted Critical
Publication of EP0948658B1 publication Critical patent/EP0948658B1/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

  • the invention relates to a molybdenum-containing TiAl alloy of high strength with good toughness or ductility and its use for the production of semi-finished products produced by hot forming and the end products to be produced therefrom.
  • TiAl-based alloys containing molybdenum are known.
  • Min-Chul-Kim et al. (Materials Transactions, JIM, Vol. 37, No. 5 (1996), p. 1197) an alloy of the composition Ti 51 Al 48; 4 Mo 0f6 , which has a yield stress of 300 MPa at 1.4% plastic elongation at room temperature .
  • an alloy of the composition Ti 508 A1 48/6 Mo 016 is known (Sumitomo Search No. 52 (1993) 74), which at room temperature achieves a yield stress of 365 MPa with a 1.2% plastic elongation.
  • the invention is based on the object of creating a TiAl alloy which, at room temperature, has a yield stress of at least 400 MPa with a plastic elongation of greater than 2% and, after hot deformation, a yield stress at room temperature of over 700 MPa.
  • a TiAl alloy with 0.1 to 0.5 at% Si and 0.5 to 4.0 at% Mo, preferably 0.2 to 0.4 at% Si and 1 to 2 at% Mo, in particular 0.2 at% Si and 1.0 at% Mo are proposed.
  • Such a TiAl alloy has a crack toughness K IC of greater than 30 MPa in the cast state with a lamellar microstructure.
  • Oxidation tests in air at 850 ° C showed an increase in mass of less than 5 mg / cm 3 after 500 h.
  • a Ti 50 Al 50 reference alloy has an increase in mass of over 13 mg / cm 3 .
  • the creep resistance was determined in comparison with a known TiAlCrSi alloy in a compression test.
  • the creep stress (strain rate or creep speed: 10 "7 / s) of the alloy according to the invention is over 450 MPa at 800 ° C.
  • the creep limit is already at stresses in the known highly developed TiAl base alloy Ti 48 Al 48 Cr 2 Nb 2 reached of 240 MPa.
  • a micro-duplex structure is set, which can achieve extremely high strengths up to 1000 ° C.
  • This is in contrast to the previous expert opinion, according to which a coarse-grained cast structure compared to a thermomechanically processed fine-grained structure was ascribed a higher high-temperature strength - yield strength and tensile strength.
  • the yield stress in the extruded state with fine-grained equiaxial structure is 700 to 800 MPa at room temperature, 380 to 600 MPa at 800 ° C and up to 180 MPa at 1000 ° C.
  • the yield stresses are therefore significantly higher than the previously known TiAl alloys in the extruded state, which only reach 600 MPa at room temperature and 400 MPa at 760 ° C.
  • the alloy according to the invention is advantageously suitable as a material for the production of, in particular, extruded objects in the temperature range from 1100 to 1350 ° C. with a yield stress of at least 700 MPa at room temperature, such as connecting rods, piston pins and rotating components, for example blades in low pressure turbines, axial compressors and centrifuges.
  • the TiAl alloy according to the invention is particularly advantageously suitable for intake and exhaust valves in internal combustion engines.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Extrusion Of Metal (AREA)
  • Forging (AREA)

Abstract

The invention relates to a TiAl alloy with 0.1 to 0.5 at % Si and 0.5 to 0.4 at % Mo as well as the use of said alloy as material for the production of semi-finished products hot shaped in temperatures ranging from 1,100 to 1,350 DEG C, specially extruded semi-finished products and of final products resulting therefrom with a yield stress of at least 700 MPa at ambient temperature, specially of admission and exhaust valves for combustion engines.

Description

TiAl-Legierung und ihre VerwendungTiAl alloy and its use
Die Erfindung betrifft eine molybdänhaltige TiAl- Legierung hoher Festigkeit mit guter Zähigkeit bzw. Duktilität und ihre Verwendung für die Herstellung von durch Warmumformung erzeugten Halbzeugen und den daraus zu fertigenden Endprodukten.The invention relates to a molybdenum-containing TiAl alloy of high strength with good toughness or ductility and its use for the production of semi-finished products produced by hot forming and the end products to be produced therefrom.
Molybdänhaltige TiAl-Basis-Legierungen sind bekannt. So beschreibt Min-Chul-Kim et al . (Materials Transactions, JIM, Vol. 37, No. 5 (1996), p. 1197)eine Legierung der Zusammensetzung Ti51Al48;4Mo0f6, die bei Raumtemperatur eine Fließspannung von 300 MPa bei 1,4 % plastischer Dehnung aufweist. Ferner ist eine Legierung der Zusammensetzung Ti508A148 /6Mo016 bekannt (Sumitomo Search Nr. 52 (1993) 74) , die bei Raumtemperatur eine Fließspannung von 365 MPa bei einer 1,2 % plastischen Dehnung erreicht.TiAl-based alloys containing molybdenum are known. Min-Chul-Kim et al. (Materials Transactions, JIM, Vol. 37, No. 5 (1996), p. 1197) an alloy of the composition Ti 51 Al 48; 4 Mo 0f6 , which has a yield stress of 300 MPa at 1.4% plastic elongation at room temperature . Furthermore, an alloy of the composition Ti 508 A1 48/6 Mo 016 is known (Sumitomo Search No. 52 (1993) 74), which at room temperature achieves a yield stress of 365 MPa with a 1.2% plastic elongation.
Der Erfindung liegt nun die Aufgabe zugrunde, eine TiAl- Legierung zu schaffen, die bei Raumtemperatur eine Fließspannung von mindestens 400 MPa bei einer plastischen Dehnung von größer als 2 % und nach einer Warmverformung eine Fließspannung bei Raumtemperatur von über 700 MPa erreicht.The invention is based on the object of creating a TiAl alloy which, at room temperature, has a yield stress of at least 400 MPa with a plastic elongation of greater than 2% and, after hot deformation, a yield stress at room temperature of over 700 MPa.
Zur Lösung dieser Aufgabe wird erfindungsgemäß eine TiAl- Legierung mit 0,1 bis 0,5 at% Si und 0,5 bis 4,0 at% Mo, vorzugsweise 0,2 bis 0,4 at% Si und 1 bis 2 at% Mo, insbesondere 0,2 at% Si und 1,0 at% Mo vorgeschlagen. Eine solche TiAl-Legierung hat im Gußzustand mit lamellarer MikroStruktur eine Rißzähigkeit KIC von größer 30 MPa . m12 eine Fließspannung bei Raumtemperatur von größer 400 MPa bei einer plastischen Dehnung von über 2 %. Oxidationsversuche an Luft bei 850 °C ergaben eine Massenzunahme von weniger als 5 mg/cm3 nach 500 h. Demgegenüber hat eine Ti50Al50-Referenzlegierung eine Massenzunahme von über 13 mg/cm3. Die Kriechfestigkeit wurde im Vergleich zu einer bekannten TiAlCrSi-Legierung im Druckversuch ermittelt . Die Kriechspannung (Dehnrate bzw. Kriechgeschwindigkeit: 10"7/s) der erfindungsgemäßen Legierung beträgt bei 800 °C über 450 MPa. Dagegen ist bei der bekannten hochentwickelten TiAl-Basis-Legierung Ti48Al48Cr2Nb2 die Kriechgrenze bereits bei Spannungen von 240 MPa erreicht.To achieve this object, a TiAl alloy with 0.1 to 0.5 at% Si and 0.5 to 4.0 at% Mo, preferably 0.2 to 0.4 at% Si and 1 to 2 at% Mo, in particular 0.2 at% Si and 1.0 at% Mo are proposed. Such a TiAl alloy has a crack toughness K IC of greater than 30 MPa in the cast state with a lamellar microstructure. m 12 a yield stress at room temperature of more than 400 MPa with a plastic elongation of over 2%. Oxidation tests in air at 850 ° C showed an increase in mass of less than 5 mg / cm 3 after 500 h. In contrast, a Ti 50 Al 50 reference alloy has an increase in mass of over 13 mg / cm 3 . The creep resistance was determined in comparison with a known TiAlCrSi alloy in a compression test. The creep stress (strain rate or creep speed: 10 "7 / s) of the alloy according to the invention is over 450 MPa at 800 ° C. On the other hand, the creep limit is already at stresses in the known highly developed TiAl base alloy Ti 48 Al 48 Cr 2 Nb 2 reached of 240 MPa.
Durch Warmumformen, insbesondere Strangpressen, im Temperaturbereich von 1100 bis 1350 °C wird ein Mikroduplex-Gefüge eingestellt, das bis 1000 °C extrem hohe Festigkeiten erzielen läßt. Dies steht im Gegensatz zu der bisherigen Fachmeinung, gemäß der einem grobkörnigen Gußgefüge gegenüber einem thermomechanisch prozessierten feinkörnigen Gefüge eine größere Hochtemperaturfestigkeit -Streckgrenze und Zugfestigkeit- zugeschrieben wurde. Je nach Umformgrad beträgt die Fließspannung im stranggepreßten Zustand bei feinkörnigem äquiaxialen Gefüge 700 bis 800 MPa bei Raumtemperatur, 380 bis 600 MPa bei 800 °C und bis zu 180 MPa bei 1000 °C. Die Fließspannungen sind somit deutlich höher als die bisher bekannter TiAl-Legierungen im stranggepreßten Zustand, die nur 600 MPa bei Raumtemperatur und 400 MPa bei 760 °C erreichen.By hot forming, in particular extrusion, in the temperature range from 1100 to 1350 ° C, a micro-duplex structure is set, which can achieve extremely high strengths up to 1000 ° C. This is in contrast to the previous expert opinion, according to which a coarse-grained cast structure compared to a thermomechanically processed fine-grained structure was ascribed a higher high-temperature strength - yield strength and tensile strength. Depending on the degree of deformation, the yield stress in the extruded state with fine-grained equiaxial structure is 700 to 800 MPa at room temperature, 380 to 600 MPa at 800 ° C and up to 180 MPa at 1000 ° C. The yield stresses are therefore significantly higher than the previously known TiAl alloys in the extruded state, which only reach 600 MPa at room temperature and 400 MPa at 760 ° C.
Bei Raumtemperatur werden plastische Dehnungen von 2,3 bis 3,4 % erreicht, 6 bis 13 % bei 700 °C und bis 91 % bei 800 °C. Aufgrund ihres vorgenannten Eigenschaftsspektrums eignet sich die erfindungsgemäße Legierung mit Vorteil als Werkstoff für die Herstellung von im Temperaturbereich von 1100 bis 1350 °C umgeformten, insbesondere stranggepreßten Gegenständen mit einer Fließspannung von mindestens 700 MPa bei Raumtemperatur, wie Pleuel, Kolbenbolzen und rotierende Bauteile, z.B. Schaufeln in Niederdruckturbinen, Axialverdichtern und Zentrifugen. Besonders vorteilhaft eignet sich die erfindungsgemäße TiAl-Legierung für Ein- und Auslaßventile in Verbrennungsmotoren . At room temperature, plastic strains of 2.3 to 3.4% are achieved, 6 to 13% at 700 ° C and up to 91% at 800 ° C. Due to its aforementioned range of properties, the alloy according to the invention is advantageously suitable as a material for the production of, in particular, extruded objects in the temperature range from 1100 to 1350 ° C. with a yield stress of at least 700 MPa at room temperature, such as connecting rods, piston pins and rotating components, for example blades in low pressure turbines, axial compressors and centrifuges. The TiAl alloy according to the invention is particularly advantageously suitable for intake and exhaust valves in internal combustion engines.

Claims

Patentansprüche claims
TiAl-Legierung mitTiAl alloy with
0,1 bis 0,5 at% Si und 0, 5 bis 4, 0 at% Mo.0.1 to 0.5 at% Si and 0.5 to 4.0 at% Mo.
TiAl-Legierung mitTiAl alloy with
0,0
2 bis 0,4 at% Si und 1,0 bis 2,0 at% Mo.2 to 0.4 at% Si and 1.0 to 2.0 at% Mo.
3. TiAl-Legierung mit3. TiAl alloy with
0,2 at% Si und 1,0 at% Mo.0.2 at% Si and 1.0 at% Mo.
4. Verwendung einer TiAl-Legierung nach einem der Ansprüche 1 bis 3, als Werkstoff für die Herstellung von im Temperaturbereich von 1100 bis 1350 °C warmumgeformten, insbesondere stranggepreßten Halbzeugen und daraus gefertigten Endprodukten mit einer Fließspannung von mindestens 700 MPa bei Raumtemperatur .4. Use of a TiAl alloy according to one of claims 1 to 3, as a material for the production of hot-formed in the temperature range from 1100 to 1350 ° C, in particular extruded semi-finished products and end products made therefrom with a yield stress of at least 700 MPa at room temperature.
5. Verwendung einer TiAl-Legierung nach einem der Ansprüche 1 bis 3 als Werkstoff zur Herstellung von Ein- und Auslaßventilen von Verbrennungsmotoren.5. Use of a TiAl alloy according to one of claims 1 to 3 as a material for the production of intake and exhaust valves of internal combustion engines.
6. Verwendung einer TiAl-Legierung nach einem der Ansprüche 1 bis 3 als Werkstoff für Gegenstände, die bei Raumtemperatur oder tieferen Temperaturen eingesetzt werden. 6. Use of a TiAl alloy according to one of claims 1 to 3 as a material for objects which are used at room temperature or lower temperatures.
EP97948908A 1996-11-09 1997-11-10 TiAl ALLOY AND ITS USE Expired - Lifetime EP0948658B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19646361 1996-11-09
DE19646361 1996-11-09
PCT/EP1997/006222 WO1998021375A1 (en) 1996-11-09 1997-11-10 TiAl ALLOY AND ITS USE

Publications (2)

Publication Number Publication Date
EP0948658A1 true EP0948658A1 (en) 1999-10-13
EP0948658B1 EP0948658B1 (en) 2003-09-17

Family

ID=7811198

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EP97948908A Expired - Lifetime EP0948658B1 (en) 1996-11-09 1997-11-10 TiAl ALLOY AND ITS USE

Country Status (5)

Country Link
EP (1) EP0948658B1 (en)
AT (1) ATE250148T1 (en)
DE (1) DE19748874C2 (en)
ES (1) ES2207755T3 (en)
WO (1) WO1998021375A1 (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT2881U1 (en) * 1998-06-08 1999-06-25 Plansee Ag METHOD FOR PRODUCING A PAD VALVE FROM GAMMA-TIAL BASE ALLOYS
DE10024343A1 (en) * 2000-05-17 2001-11-22 Gfe Met & Mat Gmbh One-piece component used e.g. for valves in combustion engines has a lamella cast structure
DE10134525A1 (en) * 2001-07-16 2003-01-30 Gfe Met & Mat Gmbh Process for capsule-free forming of gamma-TiAl materials
DE10209347B4 (en) 2002-03-02 2005-12-08 Daimlerchrysler Ag Manufacturing method for a turbine rotor
DE102004056582B4 (en) * 2004-11-23 2008-06-26 Gkss-Forschungszentrum Geesthacht Gmbh Alloy based on titanium aluminides
DE102014200644B4 (en) * 2014-01-16 2017-03-02 MTU Aero Engines AG Extruded profile and method for producing a blade of a Nachleitrads, blade of a Nachleitrads, Nachleitrad and turbomachinery with such a Nachleitrad

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2679109B2 (en) * 1988-05-27 1997-11-19 住友金属工業株式会社 Intermetallic compound TiA-based light-weight heat-resistant alloy
JPH03219034A (en) * 1990-01-22 1991-09-26 Sumitomo Metal Ind Ltd Intermetallic compound ti-al base alloy excellent in oxidation resistance
JPH03249147A (en) * 1990-02-27 1991-11-07 Sumitomo Metal Ind Ltd Intermetallic compound ti-al base alloy excellent in oxidation resistance and its manufacture
DE59106459D1 (en) * 1990-05-04 1995-10-19 Asea Brown Boveri High temperature alloy for machine components based on doped titanium aluminide.
JPH05141213A (en) * 1991-11-18 1993-06-08 Sumitomo Light Metal Ind Ltd Suction/exhaust valve for internal combustion engine
JP2707520B2 (en) * 1992-03-06 1998-01-28 大同特殊鋼株式会社 Ti-Al heat resistant parts
DE4443147A1 (en) * 1994-12-05 1996-06-27 Dechema Corrosion-resistant material for high-temperature applications in sulfidizing process gases

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9821375A1 *

Also Published As

Publication number Publication date
EP0948658B1 (en) 2003-09-17
ATE250148T1 (en) 2003-10-15
ES2207755T3 (en) 2004-06-01
WO1998021375A1 (en) 1998-05-22
DE19748874C2 (en) 2000-03-23
DE19748874A1 (en) 1998-05-14

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