EP0307386A1 - Process for producing a titanium alloy, and use of a spraying apparatus for carrying out the process - Google Patents
Process for producing a titanium alloy, and use of a spraying apparatus for carrying out the process Download PDFInfo
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- EP0307386A1 EP0307386A1 EP88890206A EP88890206A EP0307386A1 EP 0307386 A1 EP0307386 A1 EP 0307386A1 EP 88890206 A EP88890206 A EP 88890206A EP 88890206 A EP88890206 A EP 88890206A EP 0307386 A1 EP0307386 A1 EP 0307386A1
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- preform
- cooling
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- 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
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/62—Quenching devices
- C21D1/667—Quenching devices for spray quenching
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- 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
- C22F1/002—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working by rapid cooling or quenching; cooling agents used therefor
Definitions
- the invention relates to a process for the production of ⁇ + ⁇ Ti alloys or a preform material or a preform with, for example, a content of about 6% by weight of Al, about 4% by weight of V and the production-related impurities, the melted Alloy or the primary material or the preform, if appropriate after a pre-deformation, for example Forging to anneal a deformation structure with a lamellar matrix of ⁇ + ⁇ phase at a temperature of 1040 to 1060 ° C to adjust the ⁇ phase, with a first cooling a structural transformation into fine lamellar ⁇ + ⁇ structure or ⁇ 'Structure (finest ⁇ + ⁇ structure) is carried out, after which in the course of hot deformation to the extent of at least 60% degree of deformation at about 850 to 960 ° C or a temperature of about 30 to 50 ° C below the conversion or Transitus or transus temperature of the alloy, optionally from 980 to 1000 ° C, a high dis
- This known method is particularly important to the fact that the first quenching after annealing, with which the initial state ( ⁇ phase in ⁇ + ⁇ matrix) of the ⁇ phase is carried out rapidly and appropriately, in order to achieve a structure which is as uniform and fine-crystalline as possible in the form of martensitic ⁇ 'Structure and / or in the form of a fine lamellar ⁇ + ⁇ phase and to avoid thermal stresses that lead to cracks. So far, an optimal structure in crack-free parts could not be achieved due to inadequate quenching conditions, especially in this important quenching phase, especially with large cross sections.
- At least the first cooling in particular in order to achieve an adjustable, high cooling rate and a rapid, uniform decrease in temperature over the entire surface of the preform in order to avoid tension and cracking, at least the first cooling, if appropriate also at least one of the further cooling steps by spraying the preform with water, if necessary with compressed air admixture. It is preferred if care is taken when spraying that no surface area of the preform to be cooled remains unsprayed for more than 1 second during the spraying process. By spraying, a uniform, controllable cooling with a high cooling rate is achieved on the entire surface. Irregularities due to steam bubbles (Leidenfrost phenomenon), which occur when cooling by immersion, are avoided.
- the spraying process is carried out intermittently and the duration of the interruptions is selected as a function of the reheating. It is preferred if the cooling rate is adjusted by regulating the water pressure and / or the rotational speed and / or the duration of the spraying process, which may be carried out intermittently.
- a spray device is expediently used to carry out the method, which has a number, preferably at least three, spray bars, which are preferably arranged symmetrically around the receiving space for the preform to be sprayed, and optionally a device for rotating the preferably rod-shaped preform part past the spray bars .
- spray bars which are preferably arranged symmetrically around the receiving space for the preform to be sprayed, and optionally a device for rotating the preferably rod-shaped preform part past the spray bars .
- Such facilities are in themselves known, but have proven to be particularly well suited to achieve or set the cooling conditions required for an optimal structure for the titanium-based alloy mentioned.
- the further cooling steps to be carried out in the course of the production of the alloy are also easier to control with the spray device used according to the invention and can be optimized with regard to the microstructure setting. It is thus possible to carry out one, several or all further cooling steps with a spray device. Precise cooling control is particularly important with this alloy.
- the structure achieved according to the invention has a uniform grain distribution with grains ⁇ 10 ⁇ m in diameter and the phase proportions of ⁇ phase and lamellarly distributed ⁇ phase are evenly distributed over the material, optionally in a ratio of about 50:50.
- Structurally improved materials e.g. for turbine blades, cells for air and space vehicles, screws, bolts, especially components that are subject to fatigue, etc.
- FIG. 1 shows a spray nozzle 1 of a known type, with which cooling liquid, in particular water, is sprayed onto the preform to be cooled with a conical jet.
- cooling liquid in particular water
- a controllable pressure e.g. Up to 5 bar
- the speed and, if necessary, the distribution of the water particles, which are sprayed with a pressure of up to 5 bar, are increased, or the speed can thus be regulated or increased.
- the nozzle enables a surface L with a defined dimension D to be sprayed at a distance L.
- the distance between the nozzle and the preform is adjusted accordingly, so that a surface area dependent on the dimensions of the preform can be sprayed with the appropriate pressure.
- FIG. 2 shows a cylindrical pre-shaped part 2, which is arranged centrally to three nozzles 1 or to horizontal spray bars 4 similar to FIG. 3 and is rotated on rollers 3.
- the jets of the cooling medium hit corresponding lateral surface areas of the preform 2; the cooling process can be adjusted by adjusting the spray angle and / or the rotation speed be managed.
- Fig. 3 shows a vertically arranged spray bar 4 with a number of nozzles 1, the distance with respect to the cylindrical preform 2 can be changed manually or by machine. 4, three spray bars 4 are arranged around the preform.
- the preform 2 depends on a support device 5, from which it is rotated, so that the entire outer surface is sprayed off. 6 with a device for controlling the amount and pressure of the spray liquid and the compressed air, 7 with an adjustment device for the spray bar and 8 with a control device for the rotational speed is designated.
- the individual facilities are only hinted at.
- FIG. 5 and 6 show the arrangement of three or four spray strips 4 for cooling a preform 2 with a square cross-section.
- the spray parameters are adapted to the shape of the preform and the desired cooling parameters, and the rotation of the material, which has a square cross section, can be omitted when 4 nozzles are applied (FIG. 6).
- the spray parameters of individual nozzles of the spray bars can be adapted to the longitudinal shape of the preform, so that, for example, areas of small diameter are sprayed less in order to adapt the cooling rate in these areas to that with a larger diameter. Carrying out a controlled intermittent spraying also makes it possible to adapt the spraying device to different preforms.
Abstract
Description
Die Erfindung betrifft ein Verfahren zur Herstellung von α + β Ti-Legierungen bzw. ein Vorformmaterial bzw. einen Vorformteil mit beispielsweise einem Gehalt von etwa 6 Gew.-% Al, etwa 4 Gew.-% V und den herstellungsbedingten Verunreinigungen, wobei die erschmolzene Legierung bzw. das Vormaterial bzw. der Vorformteil gegebenenfalls nach einer Vorverformung, z.B. Schmieden, zur Einstellung eines Verformungsgefüges mit einer lamellaren Matrix aus α + β -Phase bei einer Temperatur von 1040 bis 1060°C zur Einstellung der β -Phase geglüht wird, wobei durch eine erste Abkühlung eine Gefügeumwandlung in feinlamellares α + β -Gefüge oder α′-Gefüge (feinstes α + β -Gefüge) vorgenommen wird, wonach im Zuge einer Warmverformung im Ausmaß von mindestens 60 % Verformungsgrad bei etwa 850 bis 960°C bzw. einer Temperatur von etwa 30 bis 50°C unterhalb der Umwandlungs- bzw. Transitus- bzw. Transustemperatur der Legierung, gegebenenfalls von 980 bis 1000°C, eine hohe Versetzungsdichte ausgebildet wird, worauf, gegebenenfalls nach einer weiteren Abkühlung, eine kontrollierte Rekristallisation bzw. Gefügeeinstellung durch eine Wärmebehandlung bei etwa 950°C erfolgt und eine β -Matrix mit fein verteilter globulitischer α -Phase im Verhältnis von etwa 50 : 50 Prozent eingestellt wird,wobei im Zuge einer folgenden Abkühlung ein weitgehend martensitischer Zerfall der β-Matrix erreicht wird, wobei in einem folgenden Glühvorgang die martensitische Matrix in eine lamellare α + β -Phase übergeführt wird.The invention relates to a process for the production of α + β Ti alloys or a preform material or a preform with, for example, a content of about 6% by weight of Al, about 4% by weight of V and the production-related impurities, the melted Alloy or the primary material or the preform, if appropriate after a pre-deformation, for example Forging to anneal a deformation structure with a lamellar matrix of α + β phase at a temperature of 1040 to 1060 ° C to adjust the β phase, with a first cooling a structural transformation into fine lamellar α + β structure or α 'Structure (finest α + β structure) is carried out, after which in the course of hot deformation to the extent of at least 60% degree of deformation at about 850 to 960 ° C or a temperature of about 30 to 50 ° C below the conversion or Transitus or transus temperature of the alloy, optionally from 980 to 1000 ° C, a high dislocation density is formed, whereupon, after further cooling, if necessary, a controlled recrystallization or microstructure adjustment takes place by heat treatment at approximately 950 ° C and a β matrix with finely divided globulitic α phase in a ratio of about 50:50 percent, with a largely martensitic decomposition in the course of a subsequent cooling ll of the β matrix is reached, with the martensitic matrix being converted into a lamellar α + β phase in a subsequent annealing process.
Bei diesem bekannten Verfahren kommt es insbesondere darauf an, daß das erste Abschrecken nach dem Glühen, mit dem der Ausgangszustand ( α -Phase in α + β -Matrix) von der β -Phase entsprechend rasch und geführt vorgenommen wird, um eine möglichst gleichmäßige und feinkristalline Gefügestruktur in Form von martensitischem α′-Gefüge und/oder in Form einer feinlamellaren α + β-Phase zu erreichen und Wärmespannungen, die zu Rissen führen, zu vermeiden. Bisher konnte ein optimales Gefüge in rißfreien Teilen aufgrund nicht entsprechender Abschreckbedingungen gerade in dieser wichtigen Abschreckphase, insbesondere bei großen Querschnitten, nicht erreicht werden.This known method is particularly important to the fact that the first quenching after annealing, with which the initial state (α phase in α + β matrix) of the β phase is carried out rapidly and appropriately, in order to achieve a structure which is as uniform and fine-crystalline as possible in the form of martensitic α 'Structure and / or in the form of a fine lamellar α + β phase and to avoid thermal stresses that lead to cracks. So far, an optimal structure in crack-free parts could not be achieved due to inadequate quenching conditions, especially in this important quenching phase, especially with large cross sections.
Erfindungsgemäß wird nunmehr vorgesehen, daß insbesondere zur Erzielung einer einstellbaren, hohen Abkühlungsgeschwindigkeit und einer raschen gleichmäßigen Temperaturabnahme über der gesamten Oberfläche des Vorformteiles zur Vermeidung von Spannungen und Rißbildung, zumindest die erste Abkühlung gegebenenfalls auch wenigstens einer der weiteren Abkühlschritte durch Besprühen des Vorformteiles mit Wasser gegebenenfalls mit Preßluftbeimengung vorgenommen wird. Bevorzugt ist es, wenn beim Absprühen darauf geachtet wird, daß während des Absprühvorganges kein Oberflächenbereich des abzukühlenden Vorformteiles länger als 1 Sekunde unbesprüht bleibt. Durch das Absprühen wird auf der gesamten Oberfläche eine gleichmäßige, regelbare Abkühlung mit großer Abkühlungsgeschwindigkeit erreicht. Unregelmäßigkeiten aufgrund von Dampfblasen (Leidenfrost-Phänomen), die bei einem durch Eintauchen erfolgenden Abkühlen auftreten, werden vermieden. Durch die über die gleichmäßig über die Oberfläche erfolgende Temperaturabnahme werden Wärmespannungsrisse vermieden. Aufgrund der hohen aber steuerbaren Abküh lungsgeschwindigkeit kann eine optimale Gefügeumwandlung bzw. -einstellung erreicht werden. Diese Tendenz wird dadurch unterstützt, daß das Gefüge des Materials von seiner abgekühlten Oberfläche aus bedingt durch die Kontraktion des intensiven Abkühlvorganges und gleichmäßigen unter großen sich gleichmäßig verteilenden Druck gesetzt wird, der die Gefügeausbildung in richtung der Ausbildung eines feinen Kornes unterstützt. Zur gleichmäßigen und raschen Abkühlung trägt auch bei, daß kein Bereich der Oberfläche länger als 1 Sekunde unbesprüht bleibt. Dazu ist es vorteilhaft, wenn das vorzugsweise stangenförmige Vormaterial während des Absprühens mit 1 bis 20, vorzugsweise 4 bis 10, Umdrehungen pro Minute vor den Wasserstrahlen rotiert wird.According to the invention, it is now provided that, in particular in order to achieve an adjustable, high cooling rate and a rapid, uniform decrease in temperature over the entire surface of the preform in order to avoid tension and cracking, at least the first cooling, if appropriate also at least one of the further cooling steps by spraying the preform with water, if necessary with compressed air admixture. It is preferred if care is taken when spraying that no surface area of the preform to be cooled remains unsprayed for more than 1 second during the spraying process. By spraying, a uniform, controllable cooling with a high cooling rate is achieved on the entire surface. Irregularities due to steam bubbles (Leidenfrost phenomenon), which occur when cooling by immersion, are avoided. Due to the temperature decrease taking place evenly over the surface, thermal stress cracks are avoided. Because of the high but controllable cooling optimal structural transformation or adjustment can be achieved. This tendency is supported by the fact that the structure of the material is set from its cooled surface due to the contraction of the intensive cooling process and uniform under large, uniformly distributing pressure, which supports the structure formation in the direction of the formation of a fine grain. Also contributing to the even and rapid cooling is that no area of the surface remains unsprayed for more than 1 second. For this purpose, it is advantageous if the preferably rod-shaped primary material is rotated at 1 to 20, preferably 4 to 10, revolutions per minute before the water jets during spraying.
Zur Verbesserung der gewünschten Gefügeeinstellung kann es vorteilhaft sein, wenn der Absprühvorgang intermittierend durchgeführt wird und die Zeitdauer der Unterbrechungen in Abhängigkeit von der Rück-Wärmung gewählt wird. Bevorzugt ist es, wenn durch Regelung des Wasserdruckes und/oder der Rotationsgeschwindigkeit und/oder der Zeitdauer des gegebenenfalls intermittierend geführten Absprühvorganges die Abkühlungsgeschwindigkeit eingestellt wird.To improve the desired microstructure setting, it can be advantageous if the spraying process is carried out intermittently and the duration of the interruptions is selected as a function of the reheating. It is preferred if the cooling rate is adjusted by regulating the water pressure and / or the rotational speed and / or the duration of the spraying process, which may be carried out intermittently.
Zweckmäßigerweise wird zur Durchführung des Verfahrens eine Sprüheinrichtung verwendet, die eine Anzahl, vorzugsweise mindestens drei, Spritzleisten aufweist, die vorzugsweise symmetrisch um den Aufnahmeraum für den abzusprühenden Vorformteil angeordnet sind, und gegebenenfalls eine Einrichtung zur Rotation des vorzugsweise stangenförmigen Vorformteiles vorbei an den Spritzleisten, umfaßt. Derartige Einrichtungen sind an sich be kannt, haben sich aber als ganz besonders gut geeignet erwiesen, die für ein optimales Gefüge erforderlichen Abkühlungsbedingungen für die erwähnte Titanbasis-Legierung zu erreichen bzw. einzustellen.A spray device is expediently used to carry out the method, which has a number, preferably at least three, spray bars, which are preferably arranged symmetrically around the receiving space for the preform to be sprayed, and optionally a device for rotating the preferably rod-shaped preform part past the spray bars . Such facilities are in themselves known, but have proven to be particularly well suited to achieve or set the cooling conditions required for an optimal structure for the titanium-based alloy mentioned.
Auch die weiteren im Zuge der Herstellung der Legierung vorzunehmenden Abkühlungsschritte sind mit der erfindungsgemäß verwendeten Sprüheinrichtung leichter beherrschbar und hinsichtlich der Gefügeeinstellung optimierbar. Es ist somit möglich, einen, mehrere oder alle weiteren Abkühlungsschritte mit einer Sprüheinrichtung durchzuführen. Gerade bei dieser Legierung ist eine exakte Führung der Abkühlung von besonderer Bedeutung.The further cooling steps to be carried out in the course of the production of the alloy are also easier to control with the spray device used according to the invention and can be optimized with regard to the microstructure setting. It is thus possible to carry out one, several or all further cooling steps with a spray device. Precise cooling control is particularly important with this alloy.
Das erfindungsgemäß erreichte Gefüge besitzt eine gleichmäßige Kornverteilung mit Körnern < 10 µ Durchmesser und die Phasenanteile an α -Phase und lamellar verteilter β -Phase liegen gleichmäßig über das Material verteilt, gegebenenfalls im Verhältnis von etwa 50 : 50 vor.The structure achieved according to the invention has a uniform grain distribution with grains <10 μm in diameter and the phase proportions of α phase and lamellarly distributed β phase are evenly distributed over the material, optionally in a ratio of about 50:50.
Mit dem erfindungsgemäßen Verfahren können strukturell verbesserte Vormaterialien z.B. für Turbinenschaufeln, Zellen für Luft- und Raumfahrzeuge, Schrauben, Bolzen, insbesondere auf Ermüdung beanspruchte Bauteile, usw. hergestellt werden.Structurally improved materials, e.g. for turbine blades, cells for air and space vehicles, screws, bolts, especially components that are subject to fatigue, etc.
Mit der erfindungsgemäßen Vorgangsweise ist es möglich, bei gegenüber herkömmlichen Abmessungen vergrößerte Abmessungen besitzenden Vormaterialien die gewünschte Gefügestruktur zu erzielen, da aufgrund der erzielbaren höheren Abkühlungsgeschwindigkeit und allenfalls genauer Einregelung z.B. größeren Durchmesser aufweisende Vorformteile gezielt behandelt werden können.With the procedure according to the invention, it is possible to achieve the desired microstructure in the case of primary materials having dimensions which are larger than conventional dimensions, since, due to the achievable higher cooling rate and, if necessary, more precise regulation, preforms having larger diameters, for example, can be treated in a targeted manner.
In der Zeichnung sind Ausführungsbeispiele von erfindungsgemäß einsetzbaren Sprühvorrichtungen dargestellt.
- Fig. 1 zeigt eine Sprühdüse,
- Fig. 2 einen Schnitt durch eine erste Ausführungsform,
- Fig. 3 und 4 eine Draufsicht und einen Schnitt durch eine weitere Ausführungsform,
- Fig. 5 und 6 mögliche Anordnungen von Sprühdüse in Sprühanlagen.
- 1 shows a spray nozzle,
- 2 shows a section through a first embodiment,
- 3 and 4 is a plan view and a section through a further embodiment,
- 5 and 6 possible arrangements of spray nozzle in spray systems.
In Fig. 1 ist eine Sprühdüse 1 bekannter Bauart dargestellt, mit der Kühlflüssigkeit, insbesondere Wasser, mit kegeligem Strahl auf den abzukühlenden Vorformteil gespritzt wird. Mit zugeführter Luft mit einem regelbaren Druck von z.B. bis 5 bar wird die Geschwindigkeit und gegebenenfalls die Verteilung der Wasserteilchen, die mit einem Druck von bis zu 5 bar ausgesprüht werden, erhöht bzw. die Geschwindigkeit kann damit eingeregelt bzw. erhöht werden. Die Düse ermöglicht in einem Abstand L das Besprühen einer Fläche mit einer definierten Abmessung D. Der Abstand Düse-Vorformteil wird entsprechend eingestellt, sodaß ein von den Abmessungen des Vorformteiles abhängiger Oberflächenbereich mit entsprechendem Druck besprüht werden kann.1 shows a
Fig. 2 zeigt einen zylindrischen Vorormteil 2, der zentrisch zu drei Düsen 1, bzw. zu horizontalen Spritzleisten 4 ähnlich Fig. 3 zusammengefaßten Düsen 1 angeordnet ist und auf Rollen 3 rotiert wird. Die Strahlen des Kühlmediums treffen entsprechende Mantelflächenbereiche des Vorformteiles 2; durch Einstellung des Sprühwinkels und/oder der Rotationsgeschwindigkeit kann der Abkühlvorgang geregelt werden.FIG. 2 shows a cylindrical pre-shaped
Fig. 3 zeigt eine vertikal angeordnete Spritzleiste 4 mit einer Anzahl von Düsen 1, deren Abstand in Bezug auf den zylindrischen Vorformteil 2 händisch oder maschinell veränderbar ist. Entsprechend Fig. 4 sind drei Spritzleisten 4 um den Vorformteil angeordnet. Der Vorformteil 2 hängt von einer Trageinrichtung 5 ab, von der er rotiert wird, sodaß die gesamte Mantelfläche abgesprüht wird. Mit 6 ist eine Einrichtung zur Regelung der Menge und des Druckes der Spritzflüssigkeit und der Preßluft, mit 7 eine Verstelleinrichtung für die Spritzleiste und mit 8 eine Regeleinrichtung für die Rotationsgeschwindigkeit bezeichnet. Die einzelnen Einrichtungen sind nur angedeutet.Fig. 3 shows a vertically arranged
Fig. 5 und 6 zeigen die Anordnung von drei bzw. vier Spritzleisten 4 zur Abkühlung eines Vorformteiles 2 mit quadratischem Querschnitt. Auch hier erfolgt eine Anpassung der Sprühparameter an die Form des Vorformteiles und die gewünschten Abkühlungsparameter, wobei die Rotation des Materials, welches Vierkantquerschnitt aufweist, bei 4-Düsenbeaufschlagung (Fig. 6) unterbleiben kann.5 and 6 show the arrangement of three or four
Bei geformten Vorformteilen können die Sprühparameter einzelner Düsen der Spritzleisten an die Längsform des Vorformteiles angepaßt werden, sodaß z.B. Bereiche geringen Durchmessers weniger besprüht werden, um die Abkühlungsgeschwindigkeit in diesen Bereichen an diejenige mit größerem Durchmesser anzupassen. Auch die Durchführung eines gesteuerten intermittierenden Absprühens ermöglicht eine Anpassung der Sprüheinrichtung an verschiedene Vorformteile.In the case of molded preforms, the spray parameters of individual nozzles of the spray bars can be adapted to the longitudinal shape of the preform, so that, for example, areas of small diameter are sprayed less in order to adapt the cooling rate in these areas to that with a larger diameter. Carrying out a controlled intermittent spraying also makes it possible to adapt the spraying device to different preforms.
In einem Versuch wurde eine Legierung der Zusammensetzung 6,03 Gew.% Al, 4,03 Gew.-% V, 0,012 Gew.-% C, 74 ppm H, 0,024 Gew.-% N, 0,14 Gew.-% 0, 0,14 Gew.-% Verunreinigungen, Rest Ti erschmolzen und entsprechend dem erfindungsgemäßen Verfahren Formteile hergestellt. Vergleichsversuche mit Formteilen, die durch Eintauchen in Wasser abgeschreckt wurden, ergaben, daß erfindungsgemäße Formteile mit gegenüber den durch Eintauchen wasserabgeschreckten Formteilen bei doppeltem Durchmesser noch immer ein feineres Gefüge und entsprechend bessere Kenndaten bzw. Prüfwerte als diese besaßen.In an experiment, an alloy with the composition 6.03% by weight Al, 4.03% by weight V, 0.012% by weight C, 74 ppm H, 0.024% by weight N, 0.14% by weight 0.14% by weight of impurities, remainder Ti melted and molded parts produced in accordance with the process according to the invention. Comparative tests with molded parts which were quenched by immersion in water showed that molded parts according to the invention with molded parts quenched by immersion at twice the diameter still had a finer structure and correspondingly better characteristics or test values than these.
Claims (8)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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AT2181/87 | 1987-08-31 | ||
AT0218187A AT391882B (en) | 1987-08-31 | 1987-08-31 | METHOD FOR HEAT TREATING ALPHA / BETA TI ALLOYS AND USE OF A SPRAYING DEVICE FOR CARRYING OUT THE METHOD |
Publications (2)
Publication Number | Publication Date |
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EP0307386A1 true EP0307386A1 (en) | 1989-03-15 |
EP0307386B1 EP0307386B1 (en) | 1991-03-06 |
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Application Number | Title | Priority Date | Filing Date |
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EP88890206A Expired - Lifetime EP0307386B1 (en) | 1987-08-31 | 1988-08-08 | Process for producing a titanium alloy, and use of a spraying apparatus for carrying out the process |
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US (1) | US4902355A (en) |
EP (1) | EP0307386B1 (en) |
AT (1) | AT391882B (en) |
DE (1) | DE3861940D1 (en) |
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EP0716155A1 (en) * | 1994-12-05 | 1996-06-12 | Nkk Corporation | Method for making an alpha-beta titanum alloy |
EP0851036A1 (en) * | 1996-12-27 | 1998-07-01 | Daido Steel Company Limited | Titanium alloy and method of producing parts therefrom |
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CN104139141A (en) * | 2014-06-30 | 2014-11-12 | 贵州安大航空锻造有限责任公司 | Equiaxed grain forging forming method for titanium alloy ring piece |
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EP0514293A1 (en) * | 1991-05-14 | 1992-11-19 | Compagnie Européenne du Zirconium CEZUS | Process for producing a workpiece in titanium alloy comprising a modified hot working stage and workpiece thus produced |
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Also Published As
Publication number | Publication date |
---|---|
ATA218187A (en) | 1990-06-15 |
EP0307386B1 (en) | 1991-03-06 |
US4902355A (en) | 1990-02-20 |
DE3861940D1 (en) | 1991-04-11 |
AT391882B (en) | 1990-12-10 |
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