EP2393952A1 - Verfahren zum beta-glühen eines aus einer ti-legierung hergestellten werkstückes - Google Patents
Verfahren zum beta-glühen eines aus einer ti-legierung hergestellten werkstückesInfo
- Publication number
- EP2393952A1 EP2393952A1 EP10702655A EP10702655A EP2393952A1 EP 2393952 A1 EP2393952 A1 EP 2393952A1 EP 10702655 A EP10702655 A EP 10702655A EP 10702655 A EP10702655 A EP 10702655A EP 2393952 A1 EP2393952 A1 EP 2393952A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- temperature
- workpiece
- annealing
- holding
- temperature level
- 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
- 238000000034 method Methods 0.000 title claims abstract description 57
- 238000000137 annealing Methods 0.000 title claims abstract description 38
- 229910001069 Ti alloy Inorganic materials 0.000 title claims abstract description 19
- 238000010438 heat treatment Methods 0.000 claims abstract description 41
- 238000001816 cooling Methods 0.000 claims abstract description 8
- 229910045601 alloy Inorganic materials 0.000 description 10
- 239000000956 alloy Substances 0.000 description 10
- 239000010936 titanium Substances 0.000 description 10
- 238000010586 diagram Methods 0.000 description 7
- 229910000883 Ti6Al4V Inorganic materials 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 238000007796 conventional method Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000010791 quenching Methods 0.000 description 2
- 230000000171 quenching effect Effects 0.000 description 2
- 229910021535 alpha-beta titanium Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000003921 particle size analysis Methods 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 230000002250 progressing effect Effects 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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
Definitions
- the invention relates to a method for heat treating a workpiece made of a titanium alloy for adjusting a fine-grained structure by annealing the workpiece above its ⁇ -transus temperature ( ⁇ -annealing), the workpiece being heated in an oven to a temperature level above its ⁇ -transus temperature and the achievement of the temperature level is determined the beginning of a predefined with respect to its duration holding time and the workpiece is left for the duration of the holding time at the temperature level before it is subjected to a cooling process.
- ⁇ -annealing ⁇ -transus temperature
- Titanium alloy workpieces are subjected to different heat treatments, depending on their chemistry and their intended use, in order to impart or adjust certain properties of the workpiece. Titanium alloy workpieces are sometimes subjected to an annealing process for this purpose.
- the main application of such annealing processes depending on the type of alloy and the desired property to be achieved, is an increase in strength, the setting of sufficient toughness and thermal stability and / or an increase in creep resistance.
- One of these heat treatment processes is so-called ⁇ -annealing.
- the workpiece is annealed just above its ⁇ -transformation temperature ( ⁇ -transus temperature) and then subjected to a defined cooling process, which may be a cooling in air or an inert gas to room temperature or quenching.
- a defined cooling process which may be a cooling in air or an inert gas to room temperature or quenching.
- the hexagonal ⁇ -phase contained in the Ti alloy is converted into a body-centered ⁇ -phase.
- the quenching process subsequent to the ⁇ -annealing is typically designed to suppress or specifically precipitate the formation of ⁇ -phase during cooling.
- Workpieces made of Ti alloys may be structural components, for example for use in aircraft construction. Such structural components Ie typically have a not inconsiderable thickness. When ß-glowing such a workpiece special care is required to achieve the desired properties. For this purpose, standards have been developed according to which specifications such Ti structural components must be annealed. By standardizing the ⁇ -annealing process, it is intended to ensure that in an industrial application of the ⁇ -annealing process, the workpieces have as uniform a grain structure as possible. A problem with ⁇ -annealing is that holding the workpiece too long above its ⁇ -transus temperature leads to undesired grain coarsening.
- the workpiece is heated to a temperature which is 30 0 C above the ⁇ -transus temperature of the Ti alloy.
- the temperature level above the .beta.-transus temperature, to which the workpiece is to be heated has a sufficient temperature difference to the .beta.-transus temperature, which is ensured even if the system-related temperature tolerances (.beta. Transus temperature, furnace temperature) are taken into account is heated when the temperature level is reached above the .beta.-transus temperature.
- a tolerance range of ⁇ 14 ° C is usually specified.
- a ß-annealing is carried out according to these specifications by heating the workpiece in an oven. If the workpiece temperature exceeds the lower tolerance limit of the predefined temperature level (Tp + 30 ° C-14 ° C), this determines the time at which the holding time begins.
- the holding time itself is given as 30 minutes, for example. Accordingly, the workpiece is left in the oven for the duration of the holding time at a temperature level above T p + 30 ° -14 ° C and then subjected to a cooling process.
- Such a method is known in principle from GB 1, 141, 409. Described in this document is a method for grain refining of the microstructure of an ⁇ - or ⁇ - ⁇ -titanium alloy.
- the workpiece is heated to a temperature above the ⁇ -transus temperature to obtain substantially complete conversion to the ⁇ -phase. At this temperature, the workpiece is held until it is sufficiently ensured that complete conversion to the ⁇ -phase has taken place. As an example, a holding time of one hour is assumed. ben. Subsequently, the workpiece is quenched to a temperature sufficiently low below the ⁇ -transus temperature to bring a substantial portion of the ⁇ -phase into an ⁇ -phase or an ⁇ -equivalent phase.
- Annealing in this document refers to an intermediate step in the production of an annealed material having a globular ⁇ -phase microstructure that is adjusted after the ⁇ -anneal and after further deformation.
- Glowing which is a final heat treatment described, with which the grain size of the ß-structure is refined, as this entry is mentioned.
- the invention is therefore the object of an initially mentioned method in such a form that a ß-annealing of workpieces made of a titanium alloy with a higher degree of process reliability is possible.
- This object is achieved by an aforementioned, generic method in which the heat treatment is carried out in a furnace whose set oven temperature for heating the workpiece to the intended for performing the holding temperature level is above the beginning of the holding time determining temperature levels of the workpiece.
- the oven temperature In contrast to the prevailing opinion that the oven temperature should be set just above the ⁇ -transus temperature in order to avoid grain coarsening due to too high a temperature, in the proposed method the oven is set at a temperature which is above the temperature level. if exceeded, the holding time begins to run. Is exploited in this - A -
- the portion of the heating curve of the workpiece between its ⁇ -transus temperature and the temperature level of the holding time is in a portion of the heating curve with a higher gradient compared to the conventional ⁇ -annealing process.
- the oven set temperature will be adjusted depending on the Ti alloy and the geometry of the workpiece. It is considered sufficient if the Ofeneinstelltemperatur 50 0 C above the beta transus temperature, well above the superiors for keeping down the temperature level of Tp + 30 ° C-14 ° C. For economic reasons, the oven setting temperature will not be set too high.
- the maximum oven setting temperature will depend on the temperature of the oven. temperature-related grain growth and the intended hold time and expected time required for heating the workpiece from its ⁇ -transus temperature to the temperature level of the hold time. Experiments have shown that even a furnace setting temperature of T p + 100 ° C leads to the expected results without having to accept too much grain growth due to the increasing heating during the holding time.
- the time for heating the workpiece from its ⁇ -transus temperature to the temperature level of the hold time is correspondingly short.
- a furnace setting temperature for heating the workpiece which, as described in the above example, is considerably above the .beta. Transus temperature
- the furnace temperature a temperature which is only slightly above the ß-temperature is to lower. This in turn reduces temperature-induced grain growth.
- the claimed method is proposed for the first time to use the furnace temperature as a manipulated variable to not insignificantly improve the process of ß- annealing of a workpiece made of a Ti alloy, in particular to be able to produce the workpieces produced by this heat treatment process with respect to in the desired property , It may well be provided to use the furnace temperature as an active manipulated variable, which, after the workpiece has reached a predetermined temperature, is lowered by a first set temperature.
- Fig. 1 is a schematically illustrated Terragenesiskurve for representing a existing of a Ti alloy workpiece for performing a ß-annealing according to the inventive method in a comparison to the heating curve of an existing alloy of the same workpiece according to the conventional ß-annealing method
- Fig. 2 is a graph showing the grain growth of a workpiece made of a Ti alloy as a function of the holding time at different temperatures.
- the Ti workpiece has the following composition:
- the beta transus temperature Tp of the employed for this piece of Ti alloy is The oven at about 970 0 C., in which the workpiece is to be subjected to the .beta.-annealing process, is set in the illustrated embodiment to a temperature of Tp + 50 ° C ,
- the Ofeneinstelltemperatur T F 1.02O 0 C entered are in the diagram the ß-Transustemperatur Tp and the set furnace temperature T F as a solid line, the tolerance range of the two temperatures Tp and T F rasterized above and below the respective temperature Tp or T F is registered. Also entered is the lower limit of the temperature level T H determined for holding the workpiece for the ⁇ -annealing process.
- the time of reaching the workpiece of the temperature T H determines the beginning of the holding time - the time that the workpiece for normal execution of ß-annealing on or above the temperature T H is to be left.
- the lower limit of the temperature level for the holding time is the temperature which, even in conventional methods, defines the start of the holding time, namely Tp + 30 ° C.-14 ° C. for the Ti6Al4V alloy in question.
- the heating of the Ti workpiece can be done from a cold oven or in an already preheated oven.
- the heating curve A is determined by a starting from a certain temperature increasingly decreasing heating gradient. The smaller the temperature difference between the current temperature of the workpiece and the furnace setting temperature T F , the lower the heating gradient. In the course of the progressing heating, the temperature of the workpiece exceeds the upper limit of the tolerance of the ⁇ -transus temperature Tp at the time t.sub.i.
- the holding time predefined with respect to its duration which in the present exemplary embodiment is 30 minutes, begins with the lower limit of the temperature level T H above the upper limit of the tolerance range of the ⁇ -transus temperature T P is selected.
- the holding time which is entered in the diagram of Figure 1 at time t 3 , the workpiece is removed from the oven and subjected to a defined cooling process.
- the heating curve A, the time interval between the times ti, t 2 is about 15 - 20 minutes.
- the furnace can be lowered to a lower temperature level. This reduces the energy consumption and, albeit slight influence of the temperature on the grain growth above the ⁇ -transus temperature. This happens at time t 2 or shortly thereafter.
- the oven temperature can be lowered to the temperature intended for holding, which in the illustrated embodiment is Tp + 30 ° C-14 ° C.
- the ⁇ -annealing described above is compared in FIG. 1 with the conventional ⁇ -annealing of a Ti workpiece.
- This Ti workpiece has the same alloy composition as that which has been heat-treated with the ⁇ -annealing of the present invention.
- T F ' the tolerance range above and below is indicated by a grid. Due to the lower furnace setting temperature T F ⁇ compared with the embodiment according to the invention, the heating process of the workpiece, shown in dash-dotted lines in FIG. 1 on the basis of its warm-up curve A ', is generally slower.
- the upper limit of the tolerance range of the ⁇ -transus temperature is exceeded and at time t 2 'the lower limit of the temperature level T H of the holding time. If the temperature level T H is exceeded at time t 2 ', the 30-minute hold time begins.
- the shorter time interval in the inventive method between the time of reaching the ß-transus temperature or the lower limit of the tolerance range thereof and the achievement of the temperature T H not only explains the higher process reliability of this method but also that the ß-annealed workpiece with this method overall fine-grained and has a more homogeneous particle size distribution.
- FIG. 2 shows a grain size comparison diagram in which the particle size is plotted as a function of the holding time of the Ti6Al4V alloy used also for the annealing experiments. Registered in the diagram are four curves differing in the temperature of their holding time. The four samples had the following alloy composition:
Landscapes
- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Nonferrous Metals Or Alloys (AREA)
- Forging (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102009003430A DE102009003430A1 (de) | 2009-02-05 | 2009-02-05 | Verfahren zum Wärmebehandeln eines aus einer Ti-Legierung bestehenden Werkstückes |
PCT/EP2010/051078 WO2010089256A1 (de) | 2009-02-05 | 2010-01-29 | Verfahren zum beta-glühen eines aus einer ti-legierung hergestellten werkstückes |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2393952A1 true EP2393952A1 (de) | 2011-12-14 |
EP2393952B1 EP2393952B1 (de) | 2014-10-29 |
Family
ID=42122948
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP10702655.1A Active EP2393952B1 (de) | 2009-02-05 | 2010-01-29 | Verfahren zum beta-glühen eines aus einer ti-legierung hergestellten werkstückes |
Country Status (5)
Country | Link |
---|---|
US (1) | US8388776B2 (de) |
EP (1) | EP2393952B1 (de) |
DE (1) | DE102009003430A1 (de) |
ES (1) | ES2528941T3 (de) |
WO (1) | WO2010089256A1 (de) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2927335B1 (de) | 2014-04-03 | 2016-07-13 | Otto Fuchs KG | Aluminiumbronzelegierung, Herstellungsverfahren und Produkt aus Aluminiumbronze |
DE102014106933A1 (de) | 2014-05-16 | 2015-11-19 | Otto Fuchs Kg | Sondermessinglegierung und Legierungsprodukt |
CN106826118B (zh) * | 2017-02-08 | 2018-09-14 | 大连盛辉钛业有限公司 | 一种用于制造椎弓根螺钉的医用钛合金棒材的制备方法 |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
SE342850B (de) * | 1966-01-24 | 1972-02-21 | Continental Titanum Metals Cor | |
JP2841766B2 (ja) * | 1990-07-13 | 1998-12-24 | 住友金属工業株式会社 | 耐食性チタン合金溶接管の製造方法 |
US5705794A (en) | 1991-10-15 | 1998-01-06 | The Boeing Company | Combined heating cycles to improve efficiency in inductive heating operations |
US5277718A (en) * | 1992-06-18 | 1994-01-11 | General Electric Company | Titanium article having improved response to ultrasonic inspection, and method therefor |
US5861070A (en) * | 1996-02-27 | 1999-01-19 | Oregon Metallurgical Corporation | Titanium-aluminum-vanadium alloys and products made using such alloys |
US20010041148A1 (en) * | 1998-05-26 | 2001-11-15 | Kabushiki Kaisha Kobe Seiko Sho | Alpha + beta type titanium alloy, process for producing titanium alloy, process for coil rolling, and process for producing cold-rolled coil of titanium alloy |
-
2009
- 2009-02-05 DE DE102009003430A patent/DE102009003430A1/de not_active Withdrawn
-
2010
- 2010-01-29 WO PCT/EP2010/051078 patent/WO2010089256A1/de active Application Filing
- 2010-01-29 ES ES10702655.1T patent/ES2528941T3/es active Active
- 2010-01-29 EP EP10702655.1A patent/EP2393952B1/de active Active
- 2010-01-29 US US13/147,797 patent/US8388776B2/en active Active
Non-Patent Citations (1)
Title |
---|
See references of WO2010089256A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO2010089256A1 (de) | 2010-08-12 |
US20120000581A1 (en) | 2012-01-05 |
ES2528941T3 (es) | 2015-02-13 |
DE102009003430A1 (de) | 2010-09-23 |
US8388776B2 (en) | 2013-03-05 |
EP2393952B1 (de) | 2014-10-29 |
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