EP3129516A1 - Heat treatment of an alloy based on titanium aluminide - Google Patents
Heat treatment of an alloy based on titanium aluminideInfo
- Publication number
- EP3129516A1 EP3129516A1 EP15719501.7A EP15719501A EP3129516A1 EP 3129516 A1 EP3129516 A1 EP 3129516A1 EP 15719501 A EP15719501 A EP 15719501A EP 3129516 A1 EP3129516 A1 EP 3129516A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- alloy
- mold
- semi
- finished product
- casting
- 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
- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 71
- 239000000956 alloy Substances 0.000 title claims abstract description 71
- 229910021324 titanium aluminide Inorganic materials 0.000 title claims abstract description 20
- OQPDWFJSZHWILH-UHFFFAOYSA-N [Al].[Al].[Al].[Ti] Chemical compound [Al].[Al].[Al].[Ti] OQPDWFJSZHWILH-UHFFFAOYSA-N 0.000 title claims abstract description 15
- 238000010438 heat treatment Methods 0.000 title description 12
- 239000011265 semifinished product Substances 0.000 claims abstract description 33
- 238000000034 method Methods 0.000 claims abstract description 22
- 238000001513 hot isostatic pressing Methods 0.000 claims abstract description 19
- 238000009750 centrifugal casting Methods 0.000 claims abstract description 10
- 238000011282 treatment Methods 0.000 claims abstract description 8
- 238000005266 casting Methods 0.000 claims description 23
- 238000000465 moulding Methods 0.000 claims description 21
- 229910052751 metal Inorganic materials 0.000 claims description 15
- 239000002184 metal Substances 0.000 claims description 15
- 230000006835 compression Effects 0.000 claims description 13
- 238000007906 compression Methods 0.000 claims description 13
- 239000000047 product Substances 0.000 claims description 13
- 229910052782 aluminium Inorganic materials 0.000 claims description 7
- 238000005520 cutting process Methods 0.000 claims description 7
- 238000003754 machining Methods 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 7
- 238000004519 manufacturing process Methods 0.000 claims description 6
- 239000011148 porous material Substances 0.000 claims description 6
- 238000010313 vacuum arc remelting Methods 0.000 claims description 6
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 5
- 238000002844 melting Methods 0.000 claims description 5
- 230000008018 melting Effects 0.000 claims description 5
- 238000010120 permanent mold casting Methods 0.000 claims description 5
- 229910052804 chromium Inorganic materials 0.000 claims description 4
- 229910052758 niobium Inorganic materials 0.000 claims description 4
- 230000007423 decrease Effects 0.000 claims description 3
- 229910001069 Ti alloy Inorganic materials 0.000 claims description 2
- 210000003625 skull Anatomy 0.000 claims description 2
- 238000007711 solidification Methods 0.000 claims description 2
- 230000008023 solidification Effects 0.000 claims description 2
- 238000004528 spin coating Methods 0.000 claims description 2
- 238000012360 testing method Methods 0.000 description 14
- 238000005056 compaction Methods 0.000 description 10
- 239000010432 diamond Substances 0.000 description 6
- 229910010038 TiAl Inorganic materials 0.000 description 4
- 239000011651 chromium Substances 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000002349 favourable effect Effects 0.000 description 3
- 239000010955 niobium Substances 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 229910000838 Al alloy Inorganic materials 0.000 description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 2
- 238000005275 alloying Methods 0.000 description 2
- 238000005119 centrifugation Methods 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- 229910001338 liquidmetal Inorganic materials 0.000 description 2
- 229910052719 titanium Inorganic materials 0.000 description 2
- 239000010936 titanium Substances 0.000 description 2
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- 208000033766 Prolymphocytic Leukemia Diseases 0.000 description 1
- UQZIWOQVLUASCR-UHFFFAOYSA-N alumane;titanium Chemical compound [AlH3].[Ti] UQZIWOQVLUASCR-UHFFFAOYSA-N 0.000 description 1
- 230000000740 bleeding effect Effects 0.000 description 1
- 229910052796 boron Inorganic materials 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000000462 isostatic pressing Methods 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000011572 manganese Substances 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 229910052715 tantalum Inorganic materials 0.000 description 1
- GUVRBAGPIYLISA-UHFFFAOYSA-N tantalum atom Chemical compound [Ta] GUVRBAGPIYLISA-UHFFFAOYSA-N 0.000 description 1
- 238000009864 tensile test Methods 0.000 description 1
- 238000007669 thermal treatment Methods 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
- B21K3/00—Making engine or like machine parts not covered by sub-groups of B21K1/00; Making propellers or the like
- B21K3/04—Making engine or like machine parts not covered by sub-groups of B21K1/00; Making propellers or the like blades, e.g. for turbines; Upsetting of blade roots
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D13/00—Centrifugal casting; Casting by using centrifugal force
- B22D13/02—Centrifugal casting; Casting by using centrifugal force of elongated solid or hollow bodies, e.g. pipes, in moulds rotating around their longitudinal axis
- B22D13/026—Centrifugal casting; Casting by using centrifugal force of elongated solid or hollow bodies, e.g. pipes, in moulds rotating around their longitudinal axis the longitudinal axis being vertical
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D13/00—Centrifugal casting; Casting by using centrifugal force
- B22D13/04—Centrifugal casting; Casting by using centrifugal force of shallow solid or hollow bodies, e.g. wheels or rings, in moulds rotating around their axis of symmetry
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D13/00—Centrifugal casting; Casting by using centrifugal force
- B22D13/10—Accessories for centrifugal casting apparatus, e.g. moulds, linings therefor, means for feeding molten metal, cleansing moulds, removing castings
- B22D13/107—Means for feeding molten metal
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
- B22D27/15—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting by using vacuum
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D7/00—Casting ingots, e.g. from ferrous metals
- B22D7/005—Casting ingots, e.g. from ferrous metals from non-ferrous metals
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
- F01D5/12—Blades
- F01D5/14—Form or construction
- F01D5/147—Construction, i.e. structural features, e.g. of weight-saving hollow blades
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
- F01D5/12—Blades
- F01D5/28—Selecting particular materials; Particular measures relating thereto; Measures against erosion or corrosion
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2220/00—Application
- F05D2220/30—Application in turbines
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2230/00—Manufacture
- F05D2230/20—Manufacture essentially without removing material
- F05D2230/21—Manufacture essentially without removing material by casting
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2230/00—Manufacture
- F05D2230/40—Heat treatment
- F05D2230/42—Heat treatment by hot isostatic pressing
Definitions
- the present invention relates to the heat treatment of metallurgical alloys and, more particularly, the heat treatments of a titanium aluminide alloy (titanium-aluminum alloy).
- Titanium aluminides are a class of alloys whose compositions include at least titanium and aluminum, and typically some additional alloying elements.
- Titanium aluminides and in particular those of the gamma type (gamma titanium-aluminide alloys in English), have the advantage of low density, good resistance to cyclic deformation at low and intermediate temperatures, and good resistance to the environment. They find application in aircraft engines as low-pressure turbine (stator or rotor) vanes, bearing supports, high-pressure compressor housings, and low-pressure turbine sealing supports, among others.
- low-pressure turbine stator
- bearing supports high-pressure compressor housings
- low-pressure turbine sealing supports among others.
- Titanium aluminides and in particular those of gamma type, are typically prepared by melting, molding and hot isostatic pressing in order to reduce the porosity resulting from the casting, followed by at least one heat treatment to obtain a good compromise between the mechanical properties in traction, fatigue and creep.
- pre-heat treating HIP heat treatement
- HIP hot isostatic pressing
- post-heat treating the post-HIP heat treating alloy at a temperature between about 1010 ° C (1850 ° F) and about 1200 ° C (2200 ° F), for about 2 to 20 hours .
- a hot isostatic pressing preferably substantially equal to the atmospheric pressure, to obtain a microstructure of the alloy comprising gamma grains and / or lamellar grains (alpha2 /gamma).
- a hot isostatic pressing preferably substantially equal to atmospheric pressure, to obtain a microstructure comprising gamma grains and / or lamellar grains (alpha2 / gamma),
- this "lower pressure than hot isostatic compression” will necessarily be less than 1700x10 5 Pa, and preferably less than 1000x10 5 Pa.
- the mold casting permanent mold casting can significantly reduce the number and size of pores, so that the criteria applied for example to a turbine blade are observed in the raw state of casting,
- a preferred feature of the invention further provides that the step of obtaining the semi-finished product from the spin casting comprises a casting in said permanent mold that the alloy will then fill in such a way that the size of the internal pores of this alloy is reduced after casting compared to what it was before.
- the simple shape of the mold allows it to be rapidly filled by the alloy in such a way as to reduce the size of its internal pores compared to that this pore size would be without casting in such a mold.
- the mold can be filled at a speed (rate of flow of the alloy in the mold) which is greater than the solidification rate at the core (ie in the mold) of the alloy, and or
- said simple form of the mold allows it to be filled in less than one minute, preferably 30 seconds, and more preferably 20 seconds, with the alloy (such as TiAl 48-2-2, in particular).
- the alloy such as TiAl 48-2-2, in particular.
- a hot spot is typically an area where the temperature of the alloy cast in the mold is higher and / or the flow of this alloy is less favorable, or the diffusion of the heat of the metal towards the mold also less favorable, such at the place of a ridge of the mold).
- the step of obtaining the semi-finished product resulting from molding comprises:
- the above-mentioned step of obtaining the semi-finished product resulting from molding comprises said molding in a metal mold, by centrifugal casting of the alloy, alone or followed by cutting (coarse) into parts of said molded alloy, according to a simple form blank (corresponding to the simple shape of the permanent mold used):
- the center of the mold may not be completely filled, unlike a temporary / lost casting foundry solution (lost wax) where the castings are filled with metal,
- a feature of the proposed solution also provides that the raw semifinished molding product can be heat treated and then machined directly without intermediate dimensional control of a blank.
- a simple mold geometry therefore of the blank that comes out of its cavity, (typically having at least one plane of symmetry and / or at most one inflection) will limit the risks of non-compliance (limitation of the porosity rate by avoiding create hot spots).
- the fact that the mold is a metal mold will eliminate the risk of obtaining ceramics inclusions from the ceramic shell in the case of lost-wax foundry process
- a simple geometry of mold, so rough, will allow easy automation of machining.
- FIG. 1 is a possible functional diagram for the method of the invention
- FIG. 2 is a block resulting from molding corresponding to a semi-finished product in which here blades will be able to be machined
- FIG. 3 is a schematic view of a permanent mold centrifugal casting molding device, which can be used here,
- FIG. 4 is a schematic view from above of the permanent mold of FIG. 3 (arrow IV),
- FIGS. 5, 6 are two schematic views of permanent molds, or molding cavities, of simple shapes that can be used on the aforementioned device, illustrated in FIG. 2;
- FIGS. 10, 11 show microstructures obtained respectively with and without hot isostatic compaction, for the same thermal history
- FIG. 12 is a graph obtained from tests (numbered from 1 to 9 on the abscissa) and illustrates the difference between the result obtained obtained for test pieces (cylinders) treated thermally with isostatic compaction at hot (filled diamonds) or without hot isostatic compaction (hollow diamonds).
- FIG. 1 therefore illustrates the main steps not only of treating the alloy concerned, but more generally, as a finished product, for example of a titanium aluminide based alloy turbine blade.
- An alloy microstructure comprising gamma grains and / or lamellar grains (alpha2 / gamma) is thus obtained.
- step 13 machining in this form here of one or more turbine blades, the thermally treated semi-finished product (see Figure 2).
- a device 15 may be used as illustrated in FIG. 3, which will make it possible to mold a series of semi-finished blanks 7, each of which may have a raw bar form of a foundry where it will then be machined ( s) the (the) part (s) finie (s), here two blades 17 turbomachine turbine.
- the device 15 comprises an enclosure 19 closed and sealed in which can be applied a partial vacuum.
- the mold 25 makes it possible to cast the alloy by centrifugation, in order to obtain the blanks 7. For this, it is rotated about an axis A.
- the mold 25 comprises several cavities 27 which extend radially (axes B1 , B2 ...; 3, 4) about the axis A, preferably via a motor 29. These cavities are preferably regularly spaced angularly about the axis A which is here vertical.
- the centrifugal forces generated by the rotation of the mold cause the molten alloy to penetrate and fill these cavities.
- the casting alloy brought to the center of the mold, is distributed radially to the peripheral cavities.
- the mold 25 is opened and the molded blanks 7 are extracted.
- the walls of the mold which surround the cavities 27 for collecting the metal resist the centrifugal forces, typically more than 10 g.
- the particles are subjected to a centrifugal force, which can be increased with the angular velocity. This increase is distributed over the entire mass of the liquid metal, uniformly over the entire length of each cavity 27.
- FIG. 4 as in FIGS. 5, 6, 8, in addition to the cavities (according to one embodiment), the schematic outline of the blank corresponding to them is shown in dotted lines.
- FIGS. 8, 9 schematize a typical characteristic of a permanent mold that can be used several times: the mold comprises several shells, such as 150a, 150b, which open and close along a surface (here the joint plane 152) which is generally transverse to the axis (A) around which the mold rotates.
- the mold comprises several shells, such as 150a, 150b, which open and close along a surface (here the joint plane 152) which is generally transverse to the axis (A) around which the mold rotates.
- a separable attachment 153 such as a latch, is established between the shells so that, once the shells are separated, the molded blank can be released through the opening 154 released.
- the lines 152 also represent a joint plane making it possible to close and open the mold in question.
- the mold shown has first and second sides 33a, 33b opposite along the axis 35 and parallel to each other. These two sides are one the inlet side of the casting; It is therefore radially internal and the axis 34 is parallel (or even coincident) with one of the axes B, such as B1.
- this mold (and therefore the solid blank, polyhedron obtained) has here, between the first and second sides mentioned above, a third and a fourth side (33c, 33d) which widens between them from the first side 33a towards the second side, at a first angle and, from a break of slope (or inflection) 35, at a second greater angle than the first.
- this mold (its molding cavity) is defined (e) by a first and a second truncated pyramids 37a, 37b, the second pyramid being the extension of the first pyramid by the large base of the first pyramid which is superimposed exactly on the small base of the second.
- the mold and its molded blank have a plane of symmetry 39 perpendicular to the first and second sides 33a, 33b and which contains the axis 34.
- the first angle ⁇ is between 0 ° and 15 °
- the second angle ⁇ is less than 120 °, and preferably less than 90 °
- the embodiment of the molding cavity of FIG. 6 illustrates a polyhedral molding cavity having two opposite sides, each of generally trapezoidal shape 37a, 37b.
- the molded blank presents here:
- the access to the interior of the cavity can be done radially by one of the two lateral sides, here the largest 41 c.
- the blank has externally on a given side or face - at most an inflection by which the section of the semi-finished blank increases or decreases, with, according to its extension axis, here 34 or 43, a maximum cross section SJ_ of the blank located at one end, along this axis.
- FIG. 7 shows another advantageous solution of mold where, individually, the radially open inner end 45a of the cavity 27 for casting the alloy has a narrowing sectional shape (zone 47a) towards the center of the cavity, along the radial direction B.
- a truncated cone could be suitable.
- the shape is here in fact double funnel (head to tail), with a radially outer end portion of the cavity, which is supported, to present an enlarged end portion 47b.
- mold / blank section S2, S3 maximums are molded towards the ends, it being specified that the sections S1, S2, S3 are each defined externally, transversely to the axis of elongation concerned, as illustrated.
- the shape 47a can correspond to the heel area of this blade and the end portion 47b to the enlarged foot zone, or vice versa.
- this first blank 21 is thus remelted in the crucible 23, the remelted alloy being poured into the centrifuged permanent mold 25 to obtain a series of molded ingots corresponding to the blanks 7 (which may be called second blanks) .
- VAR Voluum Arc Remelting
- PAM Pasma Arc Melting - Fusion by arc under plasma
- the demolded blank can be cut into a shape that does not require dimensional control before this it is machined according to the expected end product; see the final step 14 of dimensional control after machining, Figure 1.
- each semi-finished product 7 will have been heat treated, without hot isostatic compression (CIC), in order to obtain an alloy microstructure comprising gamma grains and / or lamellar grains (alpha2 / gamma).
- CIC hot isostatic compression
- FIGS. 10, 11 show microstructures of TiAl 48-2-2: 48% Al 2% Cr 2% Nb (at%) obtained respectively with and without hot isostatic compaction (CIC), for the same thermal history.
- FIGS. 11 and 12 are illustrations of what has been obtained indistinctly by testing the limit values mentioned below.
- the comparative case of FIG. 10 was obtained under the following conditions (see US 5609698): first treatment, called PLL treatment, comprising a pre-HIP treatment of 1145 ° C. for 5 hours, HIP at 1255 ° C., and heat treatment at 1200 ° C for 2 hours.
- FIGS. 11 and 12 show the effectiveness of the solution proposed here for treating the semifinished product still to be machined, brought successively:
- the alloy used may in particular be TiAl 48-2-2: 48% Al; 2% Cr; 2% Nb (at%), especially as this intermetallic material proves useful for achieving at least partly certain stages of a turbomachine turbine In aircraft, the invention is more generally applicable in particular to the titanium aluminide alloys mentioned below having a composition capable of forming alpha2 and gamma phases, when the alloy is cooled from a melt.
- gamma titanium aluminides are typically titanium alloys, about 40 to 50 atomic percent (at%) of aluminum, with possibly small amounts of other alloying elements such as chromium, niobium, vanadium, tantalum, manganese and / or boron.
- Preferred compositions are from about 45.0 to about 48.5 atomic percent of aluminum, and are therefore at the upper end of the operating range.
- Ti-48Al-2 Cr -2nb Ti-48Al-2Mn-2Nb, Ti-49Al-1 V, ⁇ -47 ⁇ -1 Mn-2Nb-0.5W-0.5Mo -0.2 Si, and ⁇ -47 ⁇ -5Nb-1 W. If the manufacturing conditions (in particular the heat treatment) applied to these specific alloys correspond to the aforementioned case of TiAl 48-2-2, in conjunction with FIGS. 12, the results provided in Figure 12 are applicable to them.
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1453131A FR3019561B1 (en) | 2014-04-08 | 2014-04-08 | THERMAL TREATMENT OF AN ALLOY BASED ON TITANIUM ALUMINUM |
PCT/FR2015/050871 WO2015155448A1 (en) | 2014-04-08 | 2015-04-02 | Heat treatment of an alloy based on titanium aluminide |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3129516A1 true EP3129516A1 (en) | 2017-02-15 |
EP3129516B1 EP3129516B1 (en) | 2021-06-09 |
Family
ID=51483536
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP15719501.7A Active EP3129516B1 (en) | 2014-04-08 | 2015-04-02 | Thermal treatment of an aluminium-titanium based alloy |
Country Status (4)
Country | Link |
---|---|
US (1) | US10329655B2 (en) |
EP (1) | EP3129516B1 (en) |
FR (1) | FR3019561B1 (en) |
WO (1) | WO2015155448A1 (en) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102016224386A1 (en) * | 2016-12-07 | 2018-06-07 | MTU Aero Engines AG | METHOD FOR PRODUCING A SHOVEL FOR A FLOW MACHINE |
FR3073163B1 (en) * | 2017-11-07 | 2022-07-15 | Safran Aircraft Engines | DEVICE AND METHOD FOR MANUFACTURING A METAL ALLOY BLIND BY CENTRIFUGAL CASTING |
CN110195172B (en) * | 2019-07-15 | 2021-03-23 | 哈尔滨工业大学 | Ti2AlNb-based alloy material and preparation method thereof |
CN112705677B (en) * | 2020-12-16 | 2022-05-13 | 辽宁科技大学 | Device and method for rotary casting of metal ingot |
FR3137006A1 (en) * | 2022-06-22 | 2023-12-29 | Safran | METHOD FOR MANUFACTURING A PLURALITY OF TURBOMACHINE BLADES |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5109603A (en) * | 1989-08-09 | 1992-05-05 | Texas Instruments Incorporated | Method of waterproof sealing a lead from a pressure or temperature responsive switch |
US5609698A (en) | 1995-01-23 | 1997-03-11 | General Electric Company | Processing of gamma titanium-aluminide alloy using a heat treatment prior to deformation processing |
AT5199U1 (en) * | 2001-07-19 | 2002-04-25 | Plansee Ag | MOLDED PART FROM AN INTERMETALLIC GAMMA-TI-AL MATERIAL |
US8858697B2 (en) * | 2011-10-28 | 2014-10-14 | General Electric Company | Mold compositions |
WO2014057208A2 (en) * | 2012-10-09 | 2014-04-17 | Snecma | Method for manufacturing metal parts for a turbine machine |
US9364890B2 (en) * | 2013-03-11 | 2016-06-14 | Ati Properties, Inc. | Enhanced techniques for centrifugal casting of molten materials |
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2014
- 2014-04-08 FR FR1453131A patent/FR3019561B1/en active Active
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2015
- 2015-04-02 WO PCT/FR2015/050871 patent/WO2015155448A1/en active Application Filing
- 2015-04-02 EP EP15719501.7A patent/EP3129516B1/en active Active
- 2015-04-02 US US15/302,418 patent/US10329655B2/en active Active
Non-Patent Citations (2)
Title |
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None * |
See also references of WO2015155448A1 * |
Also Published As
Publication number | Publication date |
---|---|
FR3019561B1 (en) | 2017-12-08 |
US10329655B2 (en) | 2019-06-25 |
US20170022594A1 (en) | 2017-01-26 |
FR3019561A1 (en) | 2015-10-09 |
WO2015155448A1 (en) | 2015-10-15 |
EP3129516B1 (en) | 2021-06-09 |
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