EP0365543B1 - Systeme de traitement thermique differentiel peripherique destine a former des pieces a deux proprietes - Google Patents

Systeme de traitement thermique differentiel peripherique destine a former des pieces a deux proprietes Download PDF

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Publication number
EP0365543B1
EP0365543B1 EP19880904744 EP88904744A EP0365543B1 EP 0365543 B1 EP0365543 B1 EP 0365543B1 EP 19880904744 EP19880904744 EP 19880904744 EP 88904744 A EP88904744 A EP 88904744A EP 0365543 B1 EP0365543 B1 EP 0365543B1
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EP
European Patent Office
Prior art keywords
workpiece
beta
disc
peripheral portion
temperature
Prior art date
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Expired - Lifetime
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EP19880904744
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German (de)
English (en)
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EP0365543A1 (fr
Inventor
Wilford H. Couts, Jr.
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Wyman Gordon Co
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Wyman Gordon Co
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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
    • C22F1/10—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of nickel or cobalt or alloys based thereon
    • 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
    • C21D1/34—Methods of heating
    • C21D1/44—Methods of heating in heat-treatment baths
    • C21D1/46—Salt baths
    • 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
    • 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 present invention relates in general to the heat treatment of metals and, more particularly, to the heat treatment of superalloy workpieces in which there is a conflict between the desired properties of the center versus those of the periphery.
  • the disc could be formed in two pieces; an inner ring and an outer ring. Each could be processed to have its own properties. Then the rings could be welded or diffusion bonded together. Both welding and diffusion bonding, however, can have serious predictability problems and can cause undesirable changes in the properties of the workpieces.
  • GB-A-1 333 354 describes a method of heat treating integral disc/blade components formed from age-hardenable alloys, in which induction heating is applied only to the blades.
  • induction heating can be a very imprecise way of heating a specific portion of a disc and cannot always be sufficiently controlled to provide reproducible results, with respect to both grain size and interface nature and location. Therefore, there has been a prejudice against the use of such localized heating for this purpose.
  • An object of this invention is the provision of a heat treatment method which can provide precisely predictable results.
  • the present invention provides a method of heat treating each of a plurality of metal workpieces to provide each workpiece with a central portion and a peripheral portion which have different metallurgical states and an annularly uniform interface between the said portions, the method being performed on a workpiece each part of which has a given initial metallurgical state, the method comprising: (a) partially immersing the workpiece in a molten salt bath having uniform temperature near a well-defined surface; (b) controlling the height and angle of an axis of rotation of the workpiece with respect to the said surface of the salt bath; and (c) rotating the workpiece about the axis to cause thermal contact between the salt bath and the outer surface of a peripheral portion of the workpiece at such speed and for such time as to cause the peripheral portion to have a predetermined metallurgical state which is different from that of a central portion of the workpiece.
  • the invention also provides apparatus for heat-treating a plurality of disc-shaped workpieces comprising: (a) a bath of molten salt having a uniform temperature near a well-defined surface; (b) a controlled elevation driver adapted to mount each workpiece for rotation about an axis, to set the orientation of the axis, and to move the periphery of the workpiece into and out of the bath; (c) a controlled rotation driver adapted to rotate the workpiece about the axis while it is held by the elevation driver; and (d) a temperature sensor and temperature controller for the bath of molten salt.
  • the invention enables the formation of dual-property metal alloy workpieces, specifically peripherally-uniform dual-property workpieces, and more specifically annularly-uniform dual-property workpiece.
  • a dual-property workpiece is a workpiece having a first portion exhibiting a first set of properties and a second portion exhibiting at least one different property.
  • a dual-property workpiece is peripherally uniform when the second portion generally exists about the entire periphery of the workpiece.
  • a dual-property workpiece is annularly-uniform when the interface between the first portion and the second portion is substantially a surface of revolution about an axis of revolution passing through the first portion.
  • the method of this invention is applicable to metal alloys in which the microstructure and/or properties can be transformed by heat, hereinafter called heat-transformable alloys.
  • the method is particularly useful when applied to metal alloys in which a fine grain size is increased by heat to an equilibrium grain size which is a function of the temperature, hereinafter called heat-coarsening alloys.
  • the invention is preferably applied to superalloys, specifically, nickel-based superalloys and, more specifically, a nickel-based superalloy known as AF2-1DA-6.
  • the method also has a specific application to titanium alloys and more specifically to properties affected by heat treatment above or below the beta-transus of such alloys.
  • the method may involve the immersion of the rim of a disc-shaped workpiece in a bath of molten salt for a period of time sufficient to effect a transformation in the immersed portion of the workpiece, and, then, the rotation of the workpiece in a continuous or step-wise manner to effect the transformation around the periphery of the workpiece but not in the central portion of the workpiece.
  • Parameters include the workpiece metallurgy and geometry, rotation speed and indexing, the height and angle of the axis of rotation with respect to the salt surface (and thus the contact geometry), and the temperature of the salt.
  • Figure 1 shows a simplified view of a workpiece 10 embodying the principles of the present invention.
  • the workpiece is a turbine disc preform which is symmetric about an axis 11 except for a dovetail mortise 12 which carries the dovetail tenon 13 of a turbine blade 14.
  • the workpiece 10 has a central bore 15.
  • This workpiece is optimized if the central portion 16 and the peripheral portion 17, which are separated by a conceptual interface 18 represented by the dashed line, have different grain size and thereby different properties.
  • the interface would normally be substantially a surface of revolution about the axis 11. If the workpiece 10 were immersed in a fluid to the dotted-line 19, a segment 20, the external surface of which would contact the fluid, would be defined.
  • Figure 2 shows a conceptual view of equipment adapted to carry out the present invention.
  • the equipment consists of two main subsystems
  • the first subsystem is an agitated salt bath 22.
  • the second subsystem is the workpiece manipulator 23.
  • the salt bath subsystem 22 consists of a tank 24, a body of molten salt 25 selected to be suitable for the particular temperature to which the workpiece is to be exposed, and a power-driven agitator 26.
  • the agitator circulates the molten salt in such a way that the body of salt retains a relatively uniform temperature. While the agitated salt bath is preferred, natural convection can be used where it gives satisfactory results.
  • the tank 24 is surrounded by heating elements 27 which are controlled by a temperature controller 28.
  • the controller 28 is responsive to temperature sensor 29 which is adapted to monitor the temperature of the salt bath 25.
  • the workpiece manipulator 23 includes a workpiece holder 31 adapted to hold the workpiece.
  • the workpiece manipulator 23 also includes a base 32 which supports the mechanical elements of the workpiece manipulator 23.
  • Between the workpiece holder 31 and the base 32 are three drivers which control the orientation of the workpiece with respect to the salt bath.
  • the first driver is the elevation driver 33 which controls the height of the workpiece with respect to the surface to the salt bath.
  • the second driver is the rotation driver which rotates the workpiece.
  • the third driver is the tilt driver 35 which is adapted to tilt the axis of rotation of the workpiece with respect to the surface of the salt bath. All three of the drivers are controlled by a programmable manipulator controller 36.
  • the workpiece manipulator 23 also includes three sensors.
  • the rotation sensor 37 senses the rotation of the workpiece.
  • the elevation sensor 38 senses the elevation of the workpiece above the surface of the salt bath and the orientation of the rotation axis with respect to the surface of the salt bath.
  • the temperature sensor 39 senses the temperature of the salt bath. All three sensors are monitored by the recorder 41 which creates a permanent record of the sensor readings. Both the manipulator controller 36 and the recorder 41 are supervised by the manager 42.
  • the salt bath would be brought to the design temperature and the manager 42 would cause the controller 36 to cause elevation driver 33 to lower the workpiece into the salt bath to a predetermined level. If tilting of the axis was desired, the tilt driver 35 would adjust the axis of rotation with respect to the salt bath. At the designated cycle time, the rotation driver 34 would cause the workpiece to rotate. When the processing was complete, the elevation driver 33 would lift the workpiece out of the salt bath. During all times, the recorder 41 would be monitoring the sensors and creating a permanent record of the actual treatment received by the processing. Because of the predictability of the processing, and because of the continuous monitoring of system parameters, quality assurance without destructive testing can be achieved.
  • the discs showed progressive grain coarsening with time in the bath.
  • Disc #15 showed surface coarsening corresponding to the surface in contact with the salt.
  • a well-define interface between the fine and coarse gain existed as a curved surface having a thinest coarse portion in the middle of the disc (that is, the interface is concave when viewed from the axis of the disc), about 13 mm (1 ⁇ 2 inch) from the outer edge of the disc. This test proved that the method could cause a coarsening in a specific portion of the disc bounded by a well-defined interface between fine and coarse grain.
  • the method was then carried out with rotation of the workpiece.
  • the discs were processed to create a fine grain structure.
  • the discs were then immersed in 1218°C (2225°F) salt to 25 mm (1 inch) for 20 minutes, rotated (indexed) 60° and held another 20 minutes. This cycle was repeated until the entire periphery was treated.
  • the result was a relatively uniform coarsening from the edge inward about 20 mm (3/4 inch), so that the grain size followed a smooth transition from ASTM 6 at the edge, through ASTM 8 at 13 mm (0.5 inch) depth, to ASTM 10 at 38 mm (1.5 inch) in from the edge.
  • the workpiece would be immersed and initially held stationary for a residence time equal to the time required for the grain size within the workpiece to reach the desired equilibrium value for the salt bath temperature (i.e., the equilibrium residence time).
  • the workpiece would then be slowly rotated so that the residence time for each point in peripheral portion of the workpiece equals at least the equilibrium residence time.
  • rotation schedule is effective, other rotation schedules are also contemplated. For example, one could rotate the workpiece immediately to begin heating the entire rim and then index and overlap rotation to bring the rim to equilibrium at the end of the cycle. Alternatively, one could immediately rapidly rotate several times to preheat the rim uniformly and then slowly rotate to reach equilibrium.
  • the process is also useful in the processing of titanium-based alloys.
  • the properties of a titanium alloy workpiece can sometimes be determined by carrying out a specific heat treatment step above or below the beta-transus of the alloy.
  • a specific processing sequence rotating the rim through the salt bath to heat treat above the beta-transus
  • the rim would have properties determined by the sequence in which the particular heat treatment is carried out above the beta-transus, whereas the central or axial portion would have different properties, determined by sub-beta-transus treatment.
  • This sub-beta-transus "treatment” may, in fact, be no “treatment” at all (insufficient temperature) if above-salt-bath cooling is maximized.
  • the process can be an effective sub-beta-transus heat treatment of the central portion if the cooling environment above the salt bath is regulated (e.g., by convection) to control the temperature of the central portion of the workpiece at a point where sub-beta-transus heat treatment occurs.
  • a workpiece of Ti 6A1-4V is finish forged in the alpha beta phase field, from a furnace temperature of about 954°C (1750°F) (approximately beta transus minus 42°C (75°F). It is then solution annealed, again below the beta transus, at perhaps 968°C (1775°F) in order to set a primary alpha to beta ratio of aproximately 15%; water or oil quenching follows this solution anneal, forming a needle-like Widmanluin structure in the continuous phase beta matrix.
  • Such a structure, after stabilization annealing at 700°C (1300°F) provides an excellent combination of properties -- notably tensile strength and fatigue.
  • the disc would then be rotated through the molten salt, by a mechanism in accordance with the present invention.
  • the temperature of the bath would be above the beta transus of the material, say 1010-1070°C (1850°F to 1950°F).
  • the contact time would be sufficient to effect the desired transformed beta grain structure, but not so long as to result in excessive grain growth.
  • This transformed beta structure has been found to be the best for maximizing creep resistance.
  • the whole disc would be stabilization annealed at 700°C (1300°F), 2 hours air cooled.
  • One of the advantages of the molten salt bath concept is that the heat transfer to the workpiece surface in contact with the salt is very fast and very predictable. As a result, the process can be very accurately modeled. Furthermore, the outcome determinative parameters can be easily set, monitored, controlled, and recorded, thus making process control, quality control, and quality assurance effective with non-destructive methods.
  • the amount of heat flow, and the depth of heat penetration, and therefore, the shape and location of the interface between the altered and non-altered portion of the workpiece can be reliably controlled by setting the speed of rotation, the depth of immersion, the cooling condition above the salt bath, and the bath temperature.
  • the number of exposure rotations can be set to greater than one in appropriate situations.
  • the height of the axis of rotation of workpiece above the salt surface can be set, or, in fact, programmably varied, or even angled, to control the location and shape of the interface between the heat altered and non-heat-altered portions of the workpiece.
  • the system can be easily applied to a wide range of shapes of workpiece and can be used on workpieces of any prior history including cast, wrought or powder-formed parts.
  • the system can be applied to both gamma prime and carbide strengthened alloys, and before or after finish forging or other uniform heat treatments, for precipitation or other control.
  • the system can also be used for differential stabilization or differential aging of the central portion versus the peripheral portion to achieve dual-property workpieces.
  • the application of the present invention to the concept of differential aging provides a number of very interesting possibilities.
  • the application of the invention to the process of precipitation hardening by which certain alloys can be hardened by forming a fine and uniform dispersion of a secondary or hardening phase in the primary alloy phase.
  • the workpiece first receives solution treatment in which the workpiece is heated to a temperature above the solvus of the secondary phase, so that the secondary phase, which is often concentrated at primary phase grain boundaries, is dissolved in the primary phase, resulting in a uniform phase.
  • the workpiece is quenched to freeze the alloy as a metastable supersaturated solid solution.
  • the workpiece is brought to an elevated temperature below the secondary phase solvus.
  • Initial nucleation and growth of secondary phase results in the formation of a uniform dispersion of numerous fine secondary phase particles throughout the primary phase grains.
  • these particles grow in size, at first by diffusion from the body of solid solution and then at the expense of smaller secondary phase particles, the overall hardening effect of the secondary phase goes through a maximum with time.
  • the workpiece is treated for a time beyond that time resulting in maximum hardness, the hardness decreases and the workpiece is said to be overaged.
  • the present invention has at least three applications to the precipitation hardening process discussed above.
  • the invention could be used to solution treat only the rim of the workpiece. If processing is otherwise conventional as described above, the resulting workpiece could have a precipitation hardened periphery and a central portion with a very different microstructure. This is because, in some systems, the solution treatment is a necessary precursor to subsequent transformations. This approach is attractively simple because the solution treatment is a equilibrium process, i.e., the results are not time critical after a minimum time has expired. Thus, salt bath contact time is not critical.
  • the invention could be applied to age treat the rim. This would result in a workpiece having a hardened rim and a central portion having the properties, at least temporarily, of an underaged material. Because the age treatment is a dynamic process, i.e., the result is time dependent, the contact time in the salt bath must be more carefully controlled in this application than in those involving equilibrium processes.
  • a third application involves overaging only the rim of the workpiece. This would result in a workpiece with an overaged rim and an age hardened central portion.
  • the invention contemplates variations.
  • the system could be programmed so that the axis follows a motion cycle between each complete rotation.
  • the system could be programmed so that the axis moves gradually and continuously (linearly or non-linearly) toward or away from the salt as the workpiece rotates.
  • the system could also be programmed so that the axis moves step-wise upon each complete rotation. Each mode of motion would cause different results.
  • Another application of the present invention involves stabilizing carbides.
  • carbide stabilization Thermal processing of the alloy to convert a continuous M23C6 film to descrete globular carbides is called carbide stabilization. If a disc of Waspaloy were processed to form uniform fine gamma prime, the disc would be hard and not brittle. However, if the rim were merely coarsened by heating, the carbides might convert to film in subsequent processing or service and the rim would be embrittled.
  • the method of the present invention is used to treat the rim at 1018°C 1865°F or higher and then process at 843°C (1550°F), the spheroidal carbides in the rim are stabilized. Film-forming and embrittlement of the rim during subsequent overall aging and service is resisted.
  • the axis of rotation of the workpiece would be held above the surface of the molten salt. It is within the contemplation of this invention to partially immerse the workpiece in the bath and rotate about an axis below the surface of the salt bath. By cooling the workpiece portion passing outside of the bath, it is possible to have a higher intensity of heat treatment on the center of the workpiece than would occur on the peripheral portion. This would, of course, have the inverse effect on heat-treatment-effected properties than would occur with the axis above the salt surface.
  • Another application of the present invention involves composite workpieces.
  • the two alloys would be diffusion bonded together. After the bonding is accomplished, however, it is often desirable to expose each alloy to a different heat treatment process to prepare the disc for service.
  • the method of the present invention would provide a simple and effective way to treat each alloy in its own way.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)
  • Heat Treatment Of Articles (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)

Abstract

Système destiné à mettre au point une pièce métallique (21) dont le centre et la périphérie ont des propriétés différentes. La pièce (21) est traitée afin de lui conférer un premier état métallurgique. Ensuite, une partie de la périphérie est plongée dans un bain de sel en fusion (25) et la pièce (21) est tournée de sorte que la périphérie se voit conférer un second état métallurgique par la chaleur du bain de sel (25).

Claims (14)

  1. Un procédé de traitement thermique de chacune de plusieurs pièces métalliques, pour pourvoir chaque pièce d'une partie centrale et d'une partie périphérique possédant différents états métallurgiques, une surface de jonction annulairement uniforme étant agencée entre lesdites parties, le procédé étant appliqué à une pièce dont chaque partie possède un état métallurgique initial déterminé, le procédé comprenant les étapes ci-dessous:
    (a) immersion partielle de la pièce dans un bain de sels fondus ayant une température uni forme près d'une surface bien définie;
    (b) réglage de la hauteur et de l'angle d'un axe de rotation de la pièce par rapport à ladite surface du bain de sels; et
    (c) rotation de la pièce autour de l'axe pour entraîner un contact thermique entre le bain de sels et la surface externe d'une partie périphérique de la pièce à une vitesse et pendant un temps tels à entraîner la partie périphérique à adopter un état métallurgique prédéterminé différent de celui d'une partie centrale de la pièce.
  2. Un procédé selon la revendication 1, dans lequel la pièce est immergée et maintenue immobile jusqu'à l'atteinte d'un régime permanent avant de commencer la rotation.
  3. Un procédé selon la revendication 1, dans lequel la pièce est tournée rapidement à plusieurs reprises pour chauffer uniformément la partie périphérique avant d'être tournée lentement pour atteindre un état d'équilibre.
  4. Un procédé selon l'une quelconque des revendications précédentes, dans lequel l'ensemble de la pièce a été pourvue du même état métallurgique initial par traitement thermique de l'ensemble de la pièce dans un intervalle de températures déterminé.
  5. Un procédé selon l'une quelconque des revendications précédentes, appliqué à chacune de plusieurs pièces composées d'un superalliage à base de nickel ou d'un alliage à base de titane, de sorte que la partie centrale possède une première microstructure ou un premier état de traitement de vieillissement, ledit contact étant maintenu pendant un temps tel que la microstructure ou l'état de traitement de vieillissement de la partie périphérique sont changés en un état déterminé par des paramètres de procédure sélectionnés, englobant la température et le temps.
  6. Un procédé selon la revendication 5, dans lequel la microstructure de la partie périphérique est changée d'un état à grains fins en un état à grains plus gros.
  7. Un procédé selon la revendication 5, dans lequel la partie périphérique est durcie par précipitation.
  8. Un procédé selon la revendication 5, appliqué à chacune de plusieurs pièces composées d'un superalliage à base de titane possédant un transus béta, dans lequel la partie périphérique est traitée au-dessus du transus béta, la partie centrale étant traitée au-dessous du transus béta.
  9. Un procédé selon la revendication 5, appliqué à un disque en superalliage de titane possédant un transus béta, le procédé englobant les étapes ci-dessous
    (a) forgeage de finition du disque dans le champ de phase alpha-béta, à partir d'une température du four de l'ordre de 954°C (1750°F), à peu près 42°C (75°F) au-dessous du transus béta;
    (b) recuit par mise en solution au-dessous du transus béta, à environ 968°C (1775°F) pour fixer un premier rapport alpha-béta d'environ 15%;
    (c) trempe à l'eau ou à l'huile pour former une structure en aiguille Widmanstätten dans une matrice béta à phase continue;
    (d) recuit de stabilisation à 700°C (1300°F);
    (e) rotation du disque à travers les sels fondus à une température supérieure au transus béta du matériau, de préférence à une température comprise entre 1010 et 1070°C (1850 à 1950°F), pendant un temps de contact suffisant pour réaliser une structure souhaitée de grains béta transformée, mais non suffisamment long pour entraîner une croissance excessive des grains;
    (f) trempe à l'eau ou à l'huile;
    (g) recuit de stabilisation du disque à 700°C (1300°F); et
    (h) refroidissement à l'air.
  10. Un procédé selon la revendication 5, appliqué à un disque pour stabiliser les carbures et éviter la formation de films de limite de grain de carbures M₂₃C₆, englobant les étapes ci-dessous:
    (a) traitement thermique de l'alliage pour convertir un film continu de M₂₃C₆ en carbures globulaires discrets (stabilisation des carbures),
    (b) traitement pour former une phase gamma-prime fine et uniforme, pour rendre le disque dur et non fragile;
    (c) traitement de la partie périphérique à une température de 1018°C (1865°F) ou plus, et
    (d) traitement du disque à 843°C (1550°F), entraînant la stabilisation des carbures sphéroïdaux dans la partie périphérique ainsi qu'une résistance à la formation de films et à la fragilisation de la partie périphérique au cours du vieillissement global ultérieur et pendant le service.
  11. Un dispositif de traitement thermique de plusieurs pièces en forme de disque (21), comprenant:
    (a) un bain de sels fondus (25) possédant une température uniforme près d'une surface bien définie;
    (b) un entraîneur d'élévation réglé (33) destiné à monter chaque pièce (21) en vue de sa rotation autour d'un axe, pour ajuster l'orientation de l'axe ainsi que pour rentrer la périphérie de la pièce (21) dans le bain et pour l'en sortir;
    (c) un entraîneur de rotation réglé (34) destiné à faire tourner la pièce (21) autour de l'axe pendant qu'elle est maintenue par l'entraîneur d'élévation (33); et
    (d) une sonde de température (39) et un dispositif de réglage de la température (28) pour le bain de sels fondus (25).
  12. Un dispositif selon la revendication 11, englobant un moniteur (4) captant et enregistrant en permanence les valeurs des paramètres de procédure pendant le temps de traitement de la pièce, les paramètres englobant l'élévation, la vitesse de rotation, la température et le temps.
  13. Un dispositif selon les revendications 11 ou 12, englobant des moyens de gestion et de réglage programmables (36, 42) destinés à régler et à coordonner l'entraîneur d'élévation (33), l'entraîneur de rotation (34) et le dispositif de réglage de la température (28).
  14. Un dispositif selon l'une quelconque des revendications 10 à 13, englobant un entraîneur d'inclinaison réglé (35) destiné à incliner ledit axe par rapport à ladite surface.
EP19880904744 1987-03-24 1988-03-23 Systeme de traitement thermique differentiel peripherique destine a former des pieces a deux proprietes Expired - Lifetime EP0365543B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88904744T ATE96472T1 (de) 1987-03-24 1988-03-23 Verfahren zur unterschiedlichen randwaermebehandlung zur herstellung von werkstuecken mit dualen eigenschaften.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US2961587A 1987-03-24 1987-03-24
US29615 1987-03-24

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EP0365543A1 EP0365543A1 (fr) 1990-05-02
EP0365543B1 true EP0365543B1 (fr) 1993-10-27

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EP (1) EP0365543B1 (fr)
DE (1) DE3885283T2 (fr)
IL (1) IL85834A (fr)
WO (1) WO1988007595A1 (fr)

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Publication number Priority date Publication date Assignee Title
DE3932383C2 (de) * 1989-09-28 1995-01-05 Rheinmetall Gmbh Geschoßkörper
FR2707092B1 (fr) * 1993-06-28 1995-08-25 Pechiney Rhenalu Produit métallurgique en alliage d'Al à durcissement structural présentant une variation continue des propriétés d'emploi suivant une direction donnée et un procédé et dispositif d'obtention de celui-ci.

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3741821A (en) * 1971-05-10 1973-06-26 United Aircraft Corp Processing for integral gas turbine disc/blade component
FR2311853A2 (fr) * 1975-05-23 1976-12-17 Creusot Loire Dispositif de traitement de pieces metalliques par immersion partielle a une profondeur predeterminee
CH657151A5 (de) * 1983-10-26 1986-08-15 Bbc Brown Boveri & Cie Vorrichtung zum zonengluehen eines aus einem hochtemperatur-werkstoff bestehenden werkstuecks und verfahren zum zonengluehen.

Also Published As

Publication number Publication date
EP0365543A1 (fr) 1990-05-02
DE3885283D1 (de) 1993-12-02
WO1988007595A1 (fr) 1988-10-06
AU630332B2 (en) 1992-10-29
AU1786288A (en) 1988-11-02
DE3885283T2 (de) 1994-05-19
IL85834A (en) 1993-05-13

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