EP1851350A1 - Method for casting titanium alloy - Google Patents
Method for casting titanium alloyInfo
- Publication number
- EP1851350A1 EP1851350A1 EP06707301A EP06707301A EP1851350A1 EP 1851350 A1 EP1851350 A1 EP 1851350A1 EP 06707301 A EP06707301 A EP 06707301A EP 06707301 A EP06707301 A EP 06707301A EP 1851350 A1 EP1851350 A1 EP 1851350A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- temperature
- titanium
- alloy
- marked
- molybdenum
- 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
-
- 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
- B22D21/002—Castings of light metals
- B22D21/005—Castings of light metals with high melting point, e.g. Be 1280 degrees C, Ti 1725 degrees C
-
- 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
-
- 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
Definitions
- the invention relates to a method for casting objects from a ß-titanium alloy, more specifically a titanium-molybdenum alloy.
- Titanium alloys are becoming increasingly popular because of their many beneficial properties. In particular, because of their good chemical resistance, even at high temperature, and their low weight with excellent mechanical properties titanium alloys are used in all areas where high demands are placed on the material. Because of their excellent biocompatibility, titanium alloys are also preferably used in the medical field, in particular for implants and prostheses.
- titanium alloys are forgings, so forging processes are mostly used. Because it has been shown that titanium alloys are difficult to pour. Usually this way will label with complicated shapes, however this way leads to restrictions in the selection of suitable alloys. In particular, it was found that only unsatisfactory results are achieved when casting ⁇ -titanium alloys (US-A-2004/0136859).
- the invention has for its object to provide an improved casting process for ß-titanium alloys, which allows a production of complex shapes with good Materialeigen- shafts.
- the alloy in a method for casting articles of a ⁇ -titanium alloy comprising titanium molybdenum having a molybdenum content of 7.5 to 25%, the alloy is melted at a temperature above 1770 ° C., the molten alloy is poured into a is mold-molded appropriate hot mold, hot isostatically pressed, solution-annealed and then quenched.
- parts for engines, rotor bearings, wing boxes or other support structure parts or in the field of medicine can be endoprostheses, such as hip prostheses, or implants, such as plates and pins or dental implants.
- endoprostheses such as hip prostheses
- implants such as plates and pins or dental implants.
- article for the purposes of the present application does not include ingots intended for further processing by forming processes, ie in particular ingots not produced by knock casting for further processing by forging.
- the invention With the method according to the invention, a rational production of objects made of .beta.-titanium alloys in precision casting is achieved. achieved.
- the invention thus makes it possible to combine the advantageous properties of ⁇ -titanium alloys, in particular its outstanding mechanical properties, with the advantages of producing objects in a fine casting process. Even objects with complex shapes, which could not be made or not made meaningful by conventional forging methods, can be made thanks to the invention of a ß-titanium alloy. In this way, the invention also opens up the field of application of the complex shaped articles to the titanium alloys known for their excellent mechanical properties and biocompatibility.
- the proportion of molybdenum in the alloy or its molybdenum equivalent is in the range of 7.5 to 25%. This results in a sufficient stabilization of the ß-phase up to the range of room temperature, in particular with a molybdenum content of at least 10%. Preferably, the content is between 12 and 16%. This can be achieved by fast cooling after the investment casting a metastable ß-phase.
- the addition of other alloying agents is usually unnecessary. In particular, it is not necessary that vanadium or aluminum be added. The omission of this has the already mentioned advantage that the toxicity emanating from these alloy formers can be avoided.
- bismuth which in terms of its biocompatibility likewise does not equal titanium.
- a cold wall crucible vacuum induction plant is used to melt the beta titanium alloy.
- the high temperatures required for a safe melting of titanium-molybdenum alloys for investment casting can be achieved.
- the melting point of TiMol ⁇ is 1770 0 C to this is still a surcharge of about 60 0 C appropriate to achieve a safe investment casting.
- a temperature of 1830 0 C for TiMol5 ER has enough.
- the hot isostatic pressing takes place at a temperature having a beta transus temperature of the titanium-molybdenum alloy and a minimum of 100 0 C is at most as high as below the beta transus temperature.
- Hot isostatic pressing counteracts the unfavorable effects of an accumulation of molybdenum in dendrites while depleting the residual melt by dissolving interdendritic precipitates.
- Favorable is a temperature below the ⁇ -transus temperature, up to 100 0 C below.
- For Titanmolybdänlegie- tion with 15% molybdenum content have temperatures ranging from 710 0 C to 760 0 C, proven preferably from about 740 0 C, at an argon pressure of about 1100 to 1200 bar.
- temperatures of at least 700 ° C. up to 880 ° C. have proven useful, preferably in the region of 800 ° ° C to 860 ° C.
- Argon is preferably used to generate a protective gas atmosphere. This achieves an improvement in the ductility of the alloy.
- quenching of the article by water occurs after solution heat treatment.
- cold water is used.
- cold is meant the temperature of unheated tap water. Quenching has been shown to exert a strong influence on the ultimate mechanical properties of the article. Alternatively, it can also be quenched in inert gas, for example by argon cooling. However, the results achieved remain behind those achieved with cold water.
- the curing in a temperature range of about 600 ° C to about 700 ° C is done.
- Fig. 1 is a table with mechanical properties of the finely cast titanium alloy according to the invention
- FIG. 2 is an illustration of the microstructure in a cast condition immediately after casting
- Fig. 3 is an illustration of the microstructure after hipping; 4 shows a picture of the microstructure after solution annealing with subsequent quenching; and
- FIG. 5 shows a representation of liquidus and solidus temperatures for a titanium-molybdenum alloy.
- Starting material is a ß-titanium alloy with a molybdenum content of 15% (TiMoI5). This alloy can be purchased commercially in the form of small ingots.
- an investment casting of the objects to be cast takes place.
- For melting and casting of TiMol5 is a
- Caster provided.
- it is a cold wall crucible vacuum induction melting and casting equipment.
- the melting point of TiMol ⁇ is 1770 0 C plus a surcharge of about 60 0 C for a safe investment casting. Overall, therefore, a temperature of 1830 0 C must be reached.
- the fine casting of the melt is then carried out by means of per se known methods, for example with wax cores and ceramic forms as a lost form.
- Such investment casting techniques are known for investment casting of TiA16V4.
- the interdendritic zones have a molybdenum content of less than 15% in the cast structure, whereby the molybdenum content can decrease to values of about 10%.
- a sufficient amount of ⁇ -stabilizers is missing in the interdendritic zones. This has the consequence that an increased a / ß conversion temperature is established locally, as a result of which the precipitates to be recognized in FIG. 2 are formed.
- this layer has a thickness of about 0.03 mm.
- the castings freed from the casting molds after the investment casting are subjected to a heat treatment according to the invention.
- a hot isostatic pressing is provided, namely at a temperature just below the ß-transus temperature. It may be in the range 710 0 C to 760 0 C, preferably it is about 740 0 C.
- the unwanted precipitates in the interdendritic zones go back into solution.
- An advance storage before or after the hipping is not required.
- fine secondary phases separate again from, preferably in the original interdendritic zones (see Fig. 3, lOOOX magnification). This results in unwanted embrittlement of the material.
- the articles have a low ductility after being tipped.
- the castings are annealed in a chamber furnace under a protective gas atmosphere (eg argon).
- a protective gas atmosphere eg argon
- a temperature range of about 700 0 C to 860 0 C is selected, with a duration of several, usually two hours. There is an opposite relationship between the temperature and the duration, at higher temperature is sufficient for a shorter time and vice versa.
- the castings are quenched with cold water.
- Fig. 4 1,000X magnification
- the microstructure after solution annealing is shown.
- the objects finely cast with the method according to the invention have ⁇ -grains with an average size of more than 0.3 mm in their crystal structure. This size is typical of the crystal structure achieved by the process of the invention.
- the modulus of elasticity decreases with increasing temperature during solution annealing, to values of up to 60,000 N / mm 2 .
- the toughness values improve with decreasing strength and hardness. So you reach after two hours solution annealing at 800 0 C, a modulus of elasticity of 60,000 N / mm 2 at an elongation at break of about 40% and a breaking strength Rm of about 730 N / mm 2 .
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PL06707301T PL1851350T3 (en) | 2005-02-25 | 2006-02-27 | Method for casting titanium alloy |
EP06707301A EP1851350B1 (en) | 2005-02-25 | 2006-02-27 | Method for casting titanium alloy |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP05004173A EP1696043A1 (en) | 2005-02-25 | 2005-02-25 | Process for casting a Titanium-alloy |
PCT/EP2006/001790 WO2006089790A1 (en) | 2005-02-25 | 2006-02-27 | Method for casting titanium alloy |
EP06707301A EP1851350B1 (en) | 2005-02-25 | 2006-02-27 | Method for casting titanium alloy |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1851350A1 true EP1851350A1 (en) | 2007-11-07 |
EP1851350B1 EP1851350B1 (en) | 2009-08-05 |
Family
ID=34933944
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP05004173A Withdrawn EP1696043A1 (en) | 2005-02-25 | 2005-02-25 | Process for casting a Titanium-alloy |
EP06707301A Active EP1851350B1 (en) | 2005-02-25 | 2006-02-27 | Method for casting titanium alloy |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP05004173A Withdrawn EP1696043A1 (en) | 2005-02-25 | 2005-02-25 | Process for casting a Titanium-alloy |
Country Status (18)
Country | Link |
---|---|
EP (2) | EP1696043A1 (en) |
JP (1) | JP5155668B2 (en) |
KR (1) | KR101341298B1 (en) |
CN (1) | CN100594248C (en) |
AR (1) | AR052391A1 (en) |
AT (1) | ATE438746T1 (en) |
AU (1) | AU2006218029B2 (en) |
BR (1) | BRPI0607832A2 (en) |
CA (1) | CA2597248C (en) |
DE (1) | DE502006004443D1 (en) |
DK (1) | DK1851350T3 (en) |
ES (1) | ES2328955T3 (en) |
MX (1) | MX2007010366A (en) |
PL (1) | PL1851350T3 (en) |
RU (1) | RU2402626C2 (en) |
TW (1) | TWI395821B (en) |
WO (1) | WO2006089790A1 (en) |
ZA (1) | ZA200707586B (en) |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102019401B (en) * | 2010-12-30 | 2012-05-23 | 哈尔滨工业大学 | Cast forming method of small titanium alloy or titanium-aluminum alloy complicated casting |
US9827605B2 (en) * | 2011-02-23 | 2017-11-28 | National Institute For Materials Science | Ti—Mo alloy and method for producing the same |
CN102294436B (en) * | 2011-09-19 | 2013-01-02 | 哈尔滨实钛新材料科技发展有限公司 | Method for precisely casting titanium alloy and titanium aluminum alloy with low cost |
RU2492275C1 (en) * | 2012-01-11 | 2013-09-10 | Открытое Акционерное Общество "Корпорация Всмпо-Ависма" | Method of producing plates from two-phase titanium alloys |
CN102978554A (en) * | 2012-11-13 | 2013-03-20 | 安徽春辉仪表线缆集团有限公司 | Titanium alloy valve rod preparation method of plug valve |
CN104550949A (en) * | 2013-10-24 | 2015-04-29 | 中国科学院金属研究所 | Method for rapidly forming Ti-6Al-4V three-dimensional metal parts by electron beams |
CN105817608B (en) * | 2016-04-29 | 2019-01-18 | 南京宝泰特种材料股份有限公司 | A kind of titanium alloy smelting casting method |
CN111850346A (en) * | 2020-08-06 | 2020-10-30 | 西部金属材料股份有限公司 | High-strength titanium alloy without solid solution aging treatment and preparation method thereof |
KR20220122374A (en) | 2021-02-26 | 2022-09-02 | 창원대학교 산학협력단 | Method for vacuum centrifugal casting of titanium |
Family Cites Families (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4852614A (en) * | 1971-11-04 | 1973-07-24 | ||
JPS5217307A (en) * | 1975-07-31 | 1977-02-09 | Kobe Steel Ltd | Process for heat treatment of beta-type titanium alloy |
JPH0686638B2 (en) * | 1985-06-27 | 1994-11-02 | 三菱マテリアル株式会社 | High-strength Ti alloy material with excellent workability and method for producing the same |
US4612066A (en) * | 1985-07-25 | 1986-09-16 | Lev Levin | Method for refining microstructures of titanium alloy castings |
US4857269A (en) * | 1988-09-09 | 1989-08-15 | Pfizer Hospital Products Group Inc. | High strength, low modulus, ductile, biopcompatible titanium alloy |
JP2541341B2 (en) * | 1990-05-15 | 1996-10-09 | 大同特殊鋼株式会社 | Precision casting method and precision casting apparatus for Ti and Ti alloy |
JP3041080B2 (en) * | 1991-04-19 | 2000-05-15 | 電気興業株式会社 | Precision casting equipment |
US5226982A (en) * | 1992-05-15 | 1993-07-13 | The United States Of America As Represented By The Secretary Of The Air Force | Method to produce hollow titanium alloy articles |
US5947723A (en) * | 1993-04-28 | 1999-09-07 | Gac International, Inc. | Titanium orthodontic appliances |
JPH0841565A (en) * | 1994-07-29 | 1996-02-13 | Mitsubishi Materials Corp | Titanium alloy casting having high strength and high toughness |
JPH10130757A (en) * | 1996-10-25 | 1998-05-19 | Daido Steel Co Ltd | Inplant made of ti alloy |
US20040136859A1 (en) * | 2000-04-12 | 2004-07-15 | Cana Lab Corporation | Titanium alloys having improved castability |
US20040168751A1 (en) * | 2002-06-27 | 2004-09-02 | Wu Ming H. | Beta titanium compositions and methods of manufacture thereof |
US20040052676A1 (en) * | 2002-06-27 | 2004-03-18 | Wu Ming H. | beta titanium compositions and methods of manufacture thereof |
DE102004022458B4 (en) * | 2004-04-29 | 2006-01-19 | Leibniz-Institut Für Festkörper- Und Werkstoffforschung Dresden E.V. | Cold-formable titanium-based alloy bodies and process for their production |
EP1695676A1 (en) * | 2005-02-25 | 2006-08-30 | WALDEMAR LINK GmbH & Co. KG | Method of producing a medical implant made of a beta-Titanium-Molybdenum-alloy and according implant |
-
2005
- 2005-02-25 EP EP05004173A patent/EP1696043A1/en not_active Withdrawn
-
2006
- 2006-02-24 TW TW095106325A patent/TWI395821B/en not_active IP Right Cessation
- 2006-02-24 AR ARP060100693A patent/AR052391A1/en active IP Right Grant
- 2006-02-27 BR BRPI0607832-0A patent/BRPI0607832A2/en not_active Application Discontinuation
- 2006-02-27 AU AU2006218029A patent/AU2006218029B2/en not_active Ceased
- 2006-02-27 PL PL06707301T patent/PL1851350T3/en unknown
- 2006-02-27 AT AT06707301T patent/ATE438746T1/en active
- 2006-02-27 CN CN200680005976A patent/CN100594248C/en not_active Expired - Fee Related
- 2006-02-27 ES ES06707301T patent/ES2328955T3/en active Active
- 2006-02-27 DK DK06707301T patent/DK1851350T3/en active
- 2006-02-27 CA CA2597248A patent/CA2597248C/en not_active Expired - Fee Related
- 2006-02-27 JP JP2007556567A patent/JP5155668B2/en not_active Expired - Fee Related
- 2006-02-27 EP EP06707301A patent/EP1851350B1/en active Active
- 2006-02-27 WO PCT/EP2006/001790 patent/WO2006089790A1/en active Application Filing
- 2006-02-27 MX MX2007010366A patent/MX2007010366A/en active IP Right Grant
- 2006-02-27 RU RU2007135062/02A patent/RU2402626C2/en not_active IP Right Cessation
- 2006-02-27 KR KR1020077021726A patent/KR101341298B1/en active IP Right Grant
- 2006-02-27 DE DE502006004443T patent/DE502006004443D1/en active Active
-
2007
- 2007-09-04 ZA ZA200707586A patent/ZA200707586B/en unknown
Non-Patent Citations (1)
Title |
---|
See references of WO2006089790A1 * |
Also Published As
Publication number | Publication date |
---|---|
JP5155668B2 (en) | 2013-03-06 |
CA2597248C (en) | 2016-04-19 |
TW200643182A (en) | 2006-12-16 |
CN100594248C (en) | 2010-03-17 |
DK1851350T3 (en) | 2009-10-19 |
JP2008531288A (en) | 2008-08-14 |
PL1851350T3 (en) | 2010-01-29 |
BRPI0607832A2 (en) | 2009-06-13 |
ZA200707586B (en) | 2008-10-29 |
EP1851350B1 (en) | 2009-08-05 |
WO2006089790A1 (en) | 2006-08-31 |
EP1696043A1 (en) | 2006-08-30 |
ATE438746T1 (en) | 2009-08-15 |
CN101128609A (en) | 2008-02-20 |
AR052391A1 (en) | 2007-03-14 |
TWI395821B (en) | 2013-05-11 |
ES2328955T3 (en) | 2009-11-19 |
KR101341298B1 (en) | 2013-12-12 |
AU2006218029B2 (en) | 2011-07-21 |
RU2402626C2 (en) | 2010-10-27 |
CA2597248A1 (en) | 2006-08-31 |
RU2007135062A (en) | 2009-03-27 |
AU2006218029A1 (en) | 2006-08-31 |
DE502006004443D1 (en) | 2009-09-17 |
MX2007010366A (en) | 2007-10-17 |
KR20070105379A (en) | 2007-10-30 |
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