CN115404381B - TiAl alloy sheet and low-cost rolling method thereof - Google Patents

TiAl alloy sheet and low-cost rolling method thereof Download PDF

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CN115404381B
CN115404381B CN202211113436.2A CN202211113436A CN115404381B CN 115404381 B CN115404381 B CN 115404381B CN 202211113436 A CN202211113436 A CN 202211113436A CN 115404381 B CN115404381 B CN 115404381B
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tial alloy
rolling
sheath
alloy sheet
blank
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CN115404381A (en
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唐斌
陈晓飞
李金山
卫贝贝
王军
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Chongqing Science And Technology Innovation Center Of Northwest University Of Technology
Northwestern Polytechnical University
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Chongqing Science And Technology Innovation Center Of Northwest University Of Technology
Northwestern Polytechnical University
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    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
    • 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
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C21/00—Alloys based on aluminium
    • C22C21/003—Alloys based on aluminium containing at least 2.6% of one or more of the elements: tin, lead, antimony, bismuth, cadmium, and titanium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C30/00—Alloys containing less than 50% by weight of each constituent
    • 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
    • C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/25—Process efficiency

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Metal Rolling (AREA)

Abstract

The invention discloses a TiAl alloy sheet and a low-cost rolling method thereof, wherein the TiAl alloy sheet comprises the following main components: 46-48% of Al, 0.5-2% of Re, 1-5% of Nb or Cr, less than or equal to 0.3% of B or Y, and the balance of Ti and unavoidable impurity elements. The high temperature rolling process is to heat the packaged TiAl alloy blank in a heat treatment furnace to 1150-1200 deg.c for 0.5-1 hr, take out and roll for the first time immediately with the rolling speed of 20-180 mm/s and deformation of 15-25% of the initial thickness, heat the blank in the heat treatment furnace for 0.3-0.6 hr, take out and repeat the rolling steps until reaching the set total deformation after several times, and air cool the jacket and block blank slowly. According to the invention, the components of the TiAl alloy are designed, so that the mechanical property of the TiAl alloy is considered while the deformation capability of the alloy is improved, the process route of rolling the TiAl alloy plate is simplified, the process difficulty is reduced on the premise of preparing a high-quality thin plate, and the production cost is greatly reduced.

Description

TiAl alloy sheet and low-cost rolling method thereof
Technical Field
The invention belongs to the technical field of intermetallic compound rolling, and particularly relates to a TiAl alloy sheet and a low-cost rolling method thereof.
Background
With the development of aerospace equipment, large capacity, high speed and low energy consumption are important targets pursued by advanced aircraft. The lightweight design of the aircraft, that is, the weight reduction of the aircraft, is an important means for increasing the carrying capacity, improving the mechanical properties, increasing the flight distance or range and reducing the fuel or propellant consumption. Obviously, the use of lightweight construction materials is indispensable in this process. The TiAl alloy becomes the only candidate material for weight reduction in the upper limit range (650-900 ℃) of the use temperature of the nickel-based superalloy by virtue of the characteristics of low density, high specific strength, good high-temperature oxidation resistance, creep property and the like, and has important application value on thermal protection systems such as the skin of an aerospace plane, the heated end face and control surface of a hypersonic aircraft, the part of heated area structures near the nozzle of a rocket engine and the like. For this reason, the use of TiAl alloy sheets, in particular thin sheets, has been of great interest. By combining superplastic deformation, diffusion connection and other technologies, the TiAl alloy sheet can be used for manufacturing a complex light high-temperature-resistant honeycomb structure, has excellent electrical insulation property, electromagnetic wave transmission property and outstanding sound insulation, heat insulation and shock absorption functions, so that the material has great application potential in the aerospace field, and has wide application prospects in the fields of microwave communication, building industry and the like. In the conventional manufacturing process, hot rolling is the most commonly used method for forming TiAl alloy sheets. However, tiAl alloys are an intermetallic compound whose strong covalent bond properties render the alloy intrinsically brittle. In the hot rolling process, the TiAl alloy has the problems of narrow hot working window, high rolling temperature, easy cracking during deformation and the like, and the production cost of the TiAl alloy is high due to the severe deformation condition and low yield. Therefore, achieving low cost production of TiAl alloy sheets is a critical technique for breakthrough in this field.
Through literature and patent search, multi-pass high-temperature cladding rolling is found to be the most common method for preparing TiAl alloy plates. Patent CN03137516 proposes a preparation method of TiAl alloy plate, which adopts the technical route of annealing heat treatment and high-temperature sleeve rolling, and adopts stainless steel as a sleeve to carry out multi-pass rolling at 1250-1290 ℃ after the structure is adjusted by heat treatment so as to improve the mechanical property of the alloy. Although the method can successfully prepare the TiAl alloy plate, the rolling temperature is too high, the performance requirement on the roller is high, and the equipment cost is increased. Meanwhile, the excessively high temperature is easier to promote the used stainless steel sheath to oxidize and break in the rolling process, the due effect of the sheath cannot be achieved, the yield of the plate is low, and the production cost is increased due to waste of materials and manpower and the like. In addition, the method needs to perform structure pre-adjustment by heat treatment before rolling, while in the patent CN201710502760, blank prefabrication is performed by a mode of twice forging cogging and hot isostatic pressing, and the methods all increase the working procedures of preparing the TiAl alloy plate, so that the technological process is not simplified, and the technological cost is high. Furthermore, the present team previously proposed a method for rolling TiAl alloy sheet material in patent CN202111584215, with each pass rolling being performed with a small deformation (5% -15%) and this deformation being a corresponding percentage of the real-time thickness of the sheet material before each pass rolling. That is, as the thickness of the sheet decreases as rolling continues, the actual deformation thickness per pass gradually decreases, resulting in an increase in the number of passes required to achieve the total rolling deformation, further increasing the production cycle, human use, and energy consumption of the rolling of the TiAl alloy sheet, and increasing the additional cost of the sheet. Moreover, the smaller the thickness of the TiAl alloy sheet material is, the greater the process difficulty is. The presently disclosed preparation methods are mainly used for producing TiAl alloy plates with the thickness of more than 1mm, for example, the TiAl alloy plates with the thickness of (180-220) mm multiplied by 65mm multiplied by 3mm are prepared by a high-temperature cladding rolling technology by Haitao Zhou et Al (Haitao Zhou et Al, hot deformation behavior and microstructural evolution of as-forged Ti-44Al-8Nb- (W, B, Y) alloy with nearly lamellar microstructure, internetwallics, 81 (2017): 62-72). Therefore, the method takes the component design of the TiAl alloy as the core, improves the deformability of the alloy, reduces the rolling temperature, simplifies the rolling process and develops the low-cost rolling method of the TiAl alloy sheet.
Disclosure of Invention
The invention aims to solve the high-cost problems caused by higher rolling temperature, high sheet manufacturing difficulty, complex working procedures and the like in the existing TiAl alloy sheet preparation, thereby providing a TiAl alloy sheet and a low-cost rolling method thereof.
Specifically, the first aspect of the present invention provides a TiAl alloy sheet, which comprises the following main components in atomic percent: 46-48% of Al, 0.5-2% of Re, 1-5% of Nb or Cr, less than or equal to 0.3% of B or Y, and the balance of Ti and unavoidable impurity elements.
In the TiAl alloy sheet, the preferred content of Re is 0.8-1.5%, the preferred content of Nb is 3-5%, the preferred content of Cr is 1-2%, and the preferred content of B or Y is 0.1-0.2%. The addition of Nb is beneficial to the improvement of alloy strength, the addition of Cr is beneficial to the improvement of alloy plasticity, and one of the two can be selected according to the requirements of thin plate technical indexes. While Re promotes precipitation of a high Wen Moxu beta phase with excellent plastic deformation capability in the thermal deformation process of the alloy, is a main reason for improving the deformation capability of the alloy, and can also ensure the creep property of the alloy. The addition of B or Y and other elements can refine grains and further improve alloy strength.
The second aspect of the present invention provides a low-cost rolling method of a TiAl alloy sheet, comprising the steps of:
the first step: component adjustment: and calculating the mass percentage of the required raw materials according to the atomic percentage of each component of the TiAl alloy sheet.
And a second step of: blank preparation: preparing required raw materials according to the calculated mass percentage of the required raw materials, smelting the raw materials to prepare an ingot, and processing the ingot into a block blank;
wherein the smelting mode comprises a conventional alloy smelting mode such as vacuum consumable arc smelting or vacuum induction smelting.
Furthermore, the cast ingot manufactured by smelting can be directly processed into a block blank for rolling by a mechanical processing mode, wherein the thickness of the blank is 8-20mm, the width of the blank is 30-60mm, and the length of the blank is 50-90mm.
Furthermore, in order to prevent the influence of defects such as shrinkage porosity and shrinkage cavity in the cast ingot, the cast ingot can be subjected to hot isostatic pressing for 3-6 hours at the temperature of 1200-1280 ℃ and the pressure of 120-170MPa, and then is processed into a block blank.
And a third step of: and (3) sheath processing: and processing a sheath with corresponding size according to the size of the block blank.
Furthermore, the corresponding sheath can be machined by adopting a machining method, the thickness of the sheath is 50% -80% of that of the blank, and the sheath material can be carbon steel, stainless steel, titanium alloy or high-temperature alloy.
Fourth step: and (3) packaging a sheath: coating a coating agent with a welding resistance effect or friction reduction effect on the surface of the block blank, and then wrapping the block blank by Ti foil and putting the block blank into a wrapping groove to further increase the lubrication effect; and then the sheath is welded and sealed, and lubricant is coated on the outer side of the sheath.
Wherein the paint coated on the surface of the block blank is preferably yttrium oxide or glass lubricant; the lubricant applied to the outside of the sheath is preferably a glass lubricant.
Fifth step: high-temperature rolling: heating the packaged block blank and the package sleeve to 1150-1200 ℃ in a heat treatment furnace, preserving heat for 0.5-1h, taking out, immediately performing first-pass rolling at a rolling speed of 20-180 mm/s and a deformation amount of 15-25% of the initial thickness, then placing the block blank and the package sleeve in the heat treatment furnace, preserving heat for 0.3-0.6h, taking out, repeating the rolling steps until the set total deformation amount is reached after a plurality of passes, and slowly air-cooling the package sleeve and the block blank.
Sixth step: and (3) sheath removal: and removing the sheath by using a machining mode to obtain the TiAl alloy sheet.
As a further illustration of the invention, the method further comprises a seventh step: leveling the thin plate: and if the obtained TiAl alloy sheet is bent under the stress action in the rolling process, pressing the TiAl alloy sheet, and annealing for 5-7 hours at 800-900 ℃ in vacuum atmosphere to level the sheet.
Compared with the prior art, the invention has the following beneficial technical effects:
the invention optimizes the components of TiAl alloy by introducing Re, and the beta stability of the TiAl alloy is realized by virtue of the elementThe beta phase region is enlarged under the action of the localization, so that high Wen Moxu beta phase auxiliary deformation with excellent plastic deformation capability can be generated when the temperature is low, the rolling temperature of TiAl alloy is reduced, the TiAl alloy can be realized on a common rolling mill, and the production cost caused by expensive equipment is reduced. Furthermore, binding Re to alpha 2 The improvement effect of the ductility of the +gamma lamellar clusters effectively improves the deformability of the alloy, so that the deformation of each pass of rolling can be increased when the rolling process is designed, the required total deformation can be achieved by fewer passes, the process time is shortened, and the labor and energy cost are saved. In addition, the invention omits the procedures of pre-adjusting the structure by heat treatment or mechanical heat treatment (hot forging, hot extrusion) before rolling, and can be used for rolling by a conventional ingot casting treatment method which only needs to pass through, even does not need to pass through hot isostatic pressing, thereby simplifying the process steps and further reducing the cost brought by additional processes. More importantly, the invention improves the strong plasticity of the TiAl alloy by adding Nb or Cr, and Re has the function of improving the creep property of the alloy. In addition, the adjustment of the elements promotes the beta/beta in the plate tissue 0 The gamma phase is separated out from the phase, and the beta/beta with larger brittleness at room temperature is reduced 0 The plasticity of the sheet material is lowered due to the phase residue. Therefore, the invention ensures the service performance of the TiAl alloy sheet while realizing the low-cost preparation of the TiAl alloy sheet, and has important significance for engineering application of the TiAl alloy.
Drawings
FIG. 1 is a low cost rolling process route diagram of a TiAl alloy sheet provided by the invention.
FIG. 2 is a graph of the macro morphology and microstructure of a TiAl alloy sheet made in accordance with one embodiment of the present invention.
FIG. 3 is a graph of the macro morphology and microstructure of a TiAl alloy sheet made in accordance with example two of the present invention.
Detailed Description
In order that the above-recited objects, features and advantages of the present invention will be more clearly understood, a more particular description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings. It should be noted that, without conflict, the embodiments of the present invention and features in the embodiments may be combined with each other.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
Example 1
The TiAl alloy used in the embodiment has a composition of Ti-46Al-1Re-4Nb-0.1B (atomic percent), and adopts the technological parameters including the temperature of 1200 ℃, the rolling speed of 150mm/s, the pass deformation amount of 19% of the initial thickness, the heat preservation between passes of 0.5h and the times of 5.
The low-cost rolling method of the TiAl alloy sheet comprises the following specific steps of:
in the first step, the composition is adjusted. The mass percentage of the required raw materials is calculated according to the percentage content of Ti-46Al-1Re-4 Nb-0.1B.
And secondly, preparing blanks. Preparing required raw materials, preparing an ingot by vacuum induction melting, and directly machining into a block blank with the thickness of 15mm, the width of 30mm and the length of 60mm by using a machining mode.
And thirdly, processing the sheath. According to the size of the blank, machining a corresponding sheath by adopting a machining method, wherein the thickness of the sheath is 60% of that of the blank, and the sheath is made of 304 stainless steel.
And fourthly, packaging the package. And (3) coating a glass lubricant on the surface of the block blank, wrapping the blank by using a Ti foil, putting the block blank into a sheath groove, then welding and sealing the sheath, and coating the glass lubricant on the outer side of the sheath.
And fifthly, rolling at high temperature. Heating the packaged blank and the package in a heat treatment furnace to 1200 ℃, preserving heat for 1h, taking out, immediately performing first-pass rolling, wherein the rolling speed is 150mm/s, the deformation is 19% of the initial thickness, then placing in the heat treatment furnace, preserving heat for 0.5h, taking out, repeating the rolling steps until the set total deformation is reached after the fifth pass, and slowly air-cooling the package and the blank.
And sixthly, removing the sheath. And removing the sheath by using a machining mode to obtain the TiAl alloy sheet.
The TiAl alloy sheet obtained in this example has good surface quality, no macrocracks or microcracks exist, and the thickness of the sheet is only 1mm, as shown in FIG. 2. And it can be found from the structural observation of the sheet that the alloy contains beta/beta 0 The phase contains a large amount of short-flake gamma phase, which is helpful for weakening room temperature beta/beta 0 Brittleness of the phase.
Example two
The TiAl alloy used in the embodiment has a composition of Ti-47Al-1.5Re-1Cr-0.3Y (atomic percent), the adopted technological parameters include the temperature of 1150 ℃, the rolling speed of 60mm/s, the pass deformation amount of 22.5% of the initial thickness, the heat preservation between passes of 0.3h and the pass times of 4.
The low-cost rolling method of the TiAl alloy sheet comprises the following specific steps of:
in the first step, the composition is adjusted. The mass percentage of the required raw materials is calculated according to the percentage content of Ti-47Al-1.5Re-1 Cr-0.3Y.
And secondly, preparing blanks. Preparing required raw materials, and preparing an ingot by vacuum induction melting. The ingot is subjected to hot isostatic pressing for 4 hours at the temperature of 1240 ℃ and the pressure of 170MPa, and then the ingot is processed into a block blank with the thickness of 8mm, the width of 40mm and the length of 90mm by a mechanical processing mode.
And thirdly, processing the sheath. According to the size of the blank, a machining method is adopted to machine a corresponding sheath, the thickness of the sheath is 50% of that of the blank, and a high-temperature alloy Inconel 625 is selected as a sheath material.
And fourthly, packaging the package. And (3) coating yttrium oxide paint on the surface of the block blank, wrapping the blank by using Ti foil, putting the blank into a sheath groove, then welding and sealing the sheath, and coating glass lubricant on the outer side of the sheath.
And fifthly, rolling at high temperature. Heating the packaged blank and the package in a heat treatment furnace to 1150 ℃, preserving heat for 0.5h, taking out, immediately performing first-pass rolling with the rolling speed of 60mm/s and the deformation amount of 22.5% of the initial thickness, then placing in the heat treatment furnace, preserving heat for 0.3h, taking out, repeating the rolling steps until the set total deformation amount is reached after the fourth pass, and slowly air-cooling the package and the blank.
And sixthly, removing the sheath. And removing the sheath by using a machining mode to obtain the TiAl alloy sheet.
And seventhly, leveling the thin plate. The sheet was pressed and annealed at 900 c under vacuum for a period of 6 hours to level the sheet.
The TiAl alloy sheet obtained in this example had a flat surface, no significant oxidation and no cracks, and a sheet thickness of only 0.8mm, as shown in FIG. 3. After sampling on the sheet, the structure observation is carried out, and the result shows that the structure uniformity of the alloy is good, and the beta/beta ratio is 0 The phase contains a large amount of acicular gamma phase, which helps to raise the room temperature beta/beta 0 Phase plasticity.
Finally, it should be noted that the above-mentioned embodiments are merely for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made to the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention.

Claims (7)

1. A TiAl alloy sheet capable of improving the heat distortion capability of an alloy, characterized in that the principal components of the TiAl alloy sheet, in atomic percent, are: 46-48% of Al, 0.8-1.5% of Re, 3-4% of Nb or 1-2% of Cr, 0.1-0.2% of B or Y, and the balance of Ti and unavoidable impurity elements;
the low-cost rolling method of the TiAl alloy sheet comprises the following steps:
component adjustment: calculating the mass percentage of the required raw materials according to the atomic percentage of each component of the TiAl alloy sheet;
blank preparation: preparing required raw materials according to the calculated mass percentage of the required raw materials, smelting the raw materials to prepare an ingot, and processing the ingot into a block blank;
and (3) sheath processing: machining a sheath with a corresponding size according to the size of the block blank;
and (3) packaging a sheath: coating a coating agent with a welding resistance effect or friction reduction effect on the surface of the block blank, wrapping the block blank by using Ti foil, putting the block blank into a sheath, welding and sealing the sheath, and coating a lubricant on the outer side of the sheath;
high-temperature rolling: heating the packaged block blank and the package sleeve to 1150-1200 ℃ in a heat treatment furnace, preserving heat for 0.5-1h, taking out, immediately performing first-pass rolling at a rolling speed of 20-180 mm/s and a deformation amount of 15-25% of the initial thickness, then placing the block blank and the package sleeve in the heat treatment furnace, preserving heat for 0.3-0.6h, taking out, repeating the rolling steps until the set total deformation amount is reached after a plurality of passes, and slowly air-cooling the package sleeve and the block blank;
and (3) sheath removal: and removing the sheath to obtain the TiAl alloy sheet.
2. The thin plate of TiAl alloy capable of improving the heat deformability of the alloy according to claim 1, characterized in that the smelting means comprise vacuum consumable arc smelting or vacuum induction smelting.
3. The TiAl alloy sheet capable of improving the heat deformability of an alloy according to claim 1, further comprising, before processing the ingot into a block billet: and carrying out hot isostatic pressing on the cast ingot for 3-6 hours at the temperature of 1200-1280 ℃ and the pressure of 120-170 MPa.
4. The thin plate of TiAl alloy capable of improving the heat distortion capability of an alloy according to claim 1, wherein the ingot is processed into a block billet having a thickness of 8-20mm, a width of 30-60mm and a length of 50-90mm.
5. The TiAl alloy sheet capable of improving the heat distortion capability of an alloy according to claim 1, wherein the sheath thickness is 50% -80% of the bulk blank thickness, and the sheath material is selected from carbon steel, stainless steel, titanium alloy or superalloy.
6. The TiAl alloy sheet capable of improving the heat deformability of an alloy according to claim 1, wherein the coating agent applied to the surface of the bulk ingot is yttria or a glass lubricant; the lubricant coated on the outer side of the sheath is a glass lubricant.
7. The TiAl alloy sheet capable of improving the heat deformability of an alloy according to claim 1, wherein the method further comprises: leveling the thin plate: and if the obtained TiAl alloy sheet is bent under the stress action in the rolling process, pressing the TiAl alloy sheet, and annealing for 5-7 hours at 800-900 ℃ in vacuum atmosphere to level the sheet.
CN202211113436.2A 2022-09-14 2022-09-14 TiAl alloy sheet and low-cost rolling method thereof Active CN115404381B (en)

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US7923127B2 (en) * 2005-11-09 2011-04-12 United Technologies Corporation Direct rolling of cast gamma titanium aluminide alloys
CN101011705A (en) * 2007-01-31 2007-08-08 哈尔滨工业大学 Method for preparation of Yt-containing TiAl intermetallic compound plate material
FR3006696B1 (en) * 2013-06-11 2015-06-26 Centre Nat Rech Scient PROCESS FOR MANUFACTURING A TITANIUM ALUMINUM ALLOY PIECE
CN107699831B (en) * 2017-10-13 2019-09-06 东北大学 Pack rolling as-cast state TiAl sheet alloy method based on composite structural design

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