CN114700697A - Preparation method of TiAl-series layered composite board - Google Patents

Preparation method of TiAl-series layered composite board Download PDF

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CN114700697A
CN114700697A CN202210424299.8A CN202210424299A CN114700697A CN 114700697 A CN114700697 A CN 114700697A CN 202210424299 A CN202210424299 A CN 202210424299A CN 114700697 A CN114700697 A CN 114700697A
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temperature
tial
sheath
alloy sheet
alnb
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CN114700697B (en
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唐斌
朱雷
卫贝贝
陈彪
李金山
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Chongqing Science And Technology Innovation Center Of Northwest University Of Technology
Chongqing Sanhang New Material Technology Research Institute Co ltd
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Chongqing Science And Technology Innovation Center Of Northwest University Of Technology
Chongqing Sanhang New Material Technology Research Institute Co ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
    • B23K20/02—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating by means of a press ; Diffusion bonding
    • B23K20/023—Thermo-compression bonding
    • B23K20/026—Thermo-compression bonding with diffusion of soldering material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/01—Layered products comprising a layer of metal all layers being exclusively metallic
    • B32B15/016—Layered products comprising a layer of metal all layers being exclusively metallic all layers being formed of aluminium or aluminium alloys
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/20—Layered products comprising a layer of metal comprising aluminium or copper
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/06—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the heating method
    • 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
    • C21D9/0081—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for slabs; for billets
    • 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
    • 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
    • C22F1/02—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working in inert or controlled atmosphere or vacuum
    • 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
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K2103/00—Materials to be soldered, welded or cut
    • B23K2103/16—Composite materials, e.g. fibre reinforced
    • B23K2103/166—Multilayered materials
    • 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
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/30—Hydrogen technology
    • Y02E60/50—Fuel cells

Abstract

The invention provides a TiAl series layerThe preparation method of the composite board comprises the following steps: firstly preparing high-temperature TiAl alloy thin plate and high-temperature Ti2The method comprises the steps of carrying out surface treatment on an AlNb alloy sheet, carrying out vacuum diffusion connection, then placing the AlNb alloy sheet into a sheath assembly for high-temperature rolling, removing the sheath after multi-pass high-temperature rolling, polishing, cleaning, carrying out heat treatment, and then carrying out mechanical processing according to design requirements to obtain a layered composite plate with a designed size2The method comprises the following steps of metallurgical connection of AlNb alloy sheets, preparation of the laminated composite sheet by high-temperature rolling, and realization of double regulation and control of sheet tissues and reaction interface tissues by a heat treatment process, so that integration of process, tissue and performance is realized.

Description

Preparation method of TiAl-series layered composite board
Technical Field
The invention belongs to the technical field of preparation methods of TiAl-series composite plates, and particularly relates to a preparation method of a TiAl-series layered composite plate.
Background
The TiAl intermetallic compound has high specific strength, high specific rigidity, high specific modulus, good oxidation resistance, excellent high temperature performance, such as high temperature strength, high temperature creep property and the like. However, the TiAl intermetallic compound has intrinsic brittleness and extremely low room temperature plasticity of about 1 to 3 percent due to the characteristics of a self-phase structure; meanwhile, the toughness of the TiAl intermetallic compound is extremely low, so how to improve the plasticity and the toughness of the TiAl intermetallic compound directly influences the successful application of the TiAl intermetallic compound material under the conditions of high temperature and complex stress field. In addition, the TiAl-based intermetallic compound material is very easily oxidized during the production or processing, and other intermetallic compound phases are generated, thereby changing the properties of the material and deteriorating the performance thereof.
Therefore, how to avoid the above problems and improve the plasticity, toughness and strength of the TiAl intermetallic compound material is a problem that needs to be solved at present.
Disclosure of Invention
The invention provides a method for preparing a TiAl-based layered composite plate, which aims to solve the problems in the background art.
In order to solve the technical problems, the invention adopts the technical scheme that: a preparation method of a TiAl-series laminated composite board comprises the following steps:
s1, preparing materials, preparing high-temperature TiAl alloy thin plates and high-temperature Ti2An AlNb alloy thin plate;
s2, surface treatment, and obtaining the high-temperature TiAl alloy sheet and the high-temperature Ti2Finely grinding the to-be-connected surface of the AlNb alloy sheet by using a grinding machine, polishing the to-be-connected surface after grinding, and then immersing the to-be-connected surface in absolute ethyl alcohol for ultrasonic cleaning for later use;
s3, vacuum diffusion bonding, namely, bonding the processed high-temperature TiAl alloy thin plate with high-temperature Ti2Alternately assembling and combining the AlNb alloy sheets, placing the AlNb alloy sheets into a graphite mold prepared in advance, placing the AlNb alloy sheets into a furnace chamber of a vacuum diffusion welding machine, closing a machine door of the vacuum diffusion welding machine, and performing vacuumizing operation to finish the high-temperature TiAl alloy sheets and the high-temperature Ti2Pre-preparing an AlNb alloy sheet laminated composite material;
s4, preparing a sheath assembly, wherein the sheath assembly comprises an upper sheath cover, a lower sheath cover and a middle sheath ring, the upper sheath cover and the lower sheath cover are made of stainless steel plates with the same size and thickness, the sheath ring is positioned in the center of the upper sheath cover and the center of the lower sheath cover, the sheath ring is welded to the lower sheath cover to form a sheath assembly, and the inner surface of the upper sheath cover, the inner surface of the lower sheath cover and the inner surface of the sheath ring are respectively coated with a solder stopping agent.
S5, assembling, namely spreading refractory cotton with the thickness of 5mm on the surface of a sheath assembly coated with a solder-stop agent, loading the layered composite material prepared in the S3 into a prepared sheath assembly, welding an upper sheath cover onto the sheath assembly, wherein the upper sheath cover is coaxial with the sheath assembly, and a connecting plane of the layered composite material is parallel to the upper sheath cover during assembling, so as to complete sheath of the sample;
s6, rolling at high temperature, namely, loading the sample sleeved in the S5 into a box furnace, heating to 1200 ℃ at a constant speed of 5 ℃/min along with the furnace, preserving heat for 10-15 min, transferring the blank from the box furnace to a double-roll mill, carrying out high-temperature rolling deformation, wherein the rolling speed is 5m/min, the reduction amount between passes is controlled to be 5-10%, transferring the blank into the box furnace after the first pass is finished, preserving heat along with the furnace at 1200 ℃ for 10-15 min, and then repeating the rolling process again until the required thickness of the laminated composite plate is obtained;
s7, post-processing, namely removing the sheath through mechanical processing after multi-pass high-temperature rolling is finished, and polishing and cleaning the surface of the laminated composite plate;
and S8, performing heat treatment, namely performing heat treatment on the polished and cleaned laminated composite board in a vacuum box furnace or an argon protective atmosphere furnace.
And S9, performing final treatment, performing heat treatment, and then performing mechanical processing according to design requirements to obtain the layered composite board with the designed size, thereby completing the preparation of the TiAl layered composite board.
Preferably, in S1, the high-temperature TiAl alloy is Ti-43Al-4Nb-1Mo-0.1B alloy, high-temperature Ti2The AlNb alloy is Ti-22Al-25Nb alloy, high-temperature TiAl alloy sheet and high-temperature Ti2The thickness of the AlNb alloy sheet is 1 mm-3 mm, and the high temperature TiAl alloy sheet and the high temperature Ti are respectively2The thickness of the AlNb alloy sheet is the same, and the high-temperature TiAl alloy sheet and the high-temperature Ti are2The AlNb alloy thin plate is obtained from a forged blank by adopting linear cutting processing.
Preferably, the polishing process in S2 is performed by using 1.5# diamond paste to polish the high temperature TiAl alloy sheet and Ti2Polishing the surfaces to be connected of the AlNb alloy sheets, and then carrying out high-temperature TiAl alloy sheet and Ti2Immersing the AlNb alloy sheet into absolute ethyl alcohol for ultrasonic cleaning for 10-15 min, and finally, carrying out high-temperature TiAl alloy sheet and Ti2The AlNb alloy sheet samples were stored in absolute ethanol to be diffusion bonded.
Preferably, in S3, a vacuum operation is performedWhen the vacuum degree of the furnace chamber of the vacuum diffusion welding machine is pumped to below 5 multiplied by 10 < -3 > Pa, the temperature of the furnace is increased to 930 to 950 ℃ in a gradient way at the heating rate of 10 ℃/min, and a graphite pressure head of the vacuum diffusion welding machine is used for carrying out the treatment on a high-temperature TiAl alloy thin plate and a high-temperature Ti2Applying axial pressure of 5-10 MPa to AlNb alloy sheet alternate assembly materials, keeping for 90-180 min, unloading pressure after heat preservation is finished to enable the high-temperature TiAl alloy sheet and the high-temperature Ti to be in contact with each other2The AlNb alloy thin plate is cooled to the room temperature along with the furnace chamber of the vacuum diffusion welding machine, and then the high-temperature TiAl alloy thin plate and the high-temperature Ti are completed2And (3) pre-preparing the AlNb alloy sheet laminated composite material.
Preferably, the axial pressure is applied to the high-temperature TiAl alloy sheet and the high-temperature Ti2The connection plane of the AlNb alloy sheet alternate assembly material is kept vertical, and the top layer and the bottom layer of the alternate assembly material are high-temperature TiAl alloy sheets.
Preferably, a hole with the size of 2mm is reserved on the jacket assembly of the jacket assembly and used for exhausting gas during subsequent high-temperature rolling, when the layered composite prefabricated part is put into the manufactured jacket assembly and the upper jacket cover is welded on the jacket assembly, a hole with the size of 2mm is reserved on the upper jacket cover, and the hole on the upper jacket cover and the hole on the jacket assembly are distributed in a diagonal manner.
Preferably, after the rolling in S6 at high temperature to the last pass, the layered composite plate is transferred to a box furnace and furnace-cooled until it is cooled to room temperature.
Preferably, in S8, the heat treatment temperature is 900-1020 ℃, the heat preservation time is 30-90 min, and the temperature is ensured to be room temperature along with furnace cooling after the heat treatment is finished.
Compared with the prior art, the invention has the following advantages:
the invention realizes the high-temperature TiAl alloy sheet and Ti through vacuum diffusion connection2The preparation method comprises the following steps of metallurgical connection of AlNb alloy sheets, preparation of the laminated composite sheet by high-temperature rolling, and realization of double regulation and control of sheet structures and reaction interface structures by a heat treatment process, so that process-structure-performance integration is realized. The TiAl series laminated composite board prepared by the method has good integrity and uniform structureThe control and density are high, and the material can be used on skins of high-Mach aerospace vehicles and other high-temperature plate structures.
The technical scheme of the invention is to solve the problems of difficult forming and low ductility and toughness of TiAl intermetallic compounds, and the basic principle comprises the following points: firstly, TiAl intermetallic compound materials are easy to oxidize, and other types of intermetallic compounds are easy to generate by adding other alloying element materials; the high-temperature TiAl alloy has low plasticity but good high-temperature performance, and Ti2The AlNb alloy has good plasticity and toughness and high strength. More importantly, when the two materials are compounded, other alloying elements are not introduced, so that the properties of the matrix material can be better kept. Secondly, the problem of interface reaction is inevitable in the preparation process of the layered composite material, the vacuum diffusion bonding technology can regulate and control the interface reaction layer by optimizing process parameters, meanwhile, the oxidation problem of TiAl alloy can be avoided, the method is a precision forming technology, and the deformation of a base material in the bonding process is small. Therefore, the vacuum diffusion bonding technology is suitable for preparing high-temperature TiAl alloy sheets and Ti2An important method of the AlNb alloy sheet laminated composite plate. High-temperature rolling is an indispensable processing mode for preparing the plate, and the deformation behavior can promote the further evolution of the connection interface of the laminated composite material, so that a more excellent transition layer structure is obtained. Finally, the unreacted thin plate tissue and the structure of the reaction layer are regulated and controlled by a heat treatment process. The three process steps are not interfered with each other and are mutually supplemented, the rings are buckled with each other, and the selection of parameters among the process steps needs to be strictly controlled. Therefore, the mode of vacuum diffusion bonding, high-temperature rolling and heat treatment is very suitable for preparing the dissimilar TiAl intermetallic compound laminated composite plate.
Drawings
FIG. 1 shows high temperature TiAl/Ti obtained by three processes in comparative example of the present invention2The AlNb alloy composite plate interface microstructure comprises the following components in percentage by weight: 1 is Ti2An AlNb alloy; 2 is a high temperature TiAl alloy;
(a) the interface microstructure is formed when the plates are connected in a vacuum diffusion mode;
(b) the interface microstructure is formed by plate vacuum diffusion connection and low-temperature heat treatment;
(c) the microstructure is an interface microstructure after plate vacuum diffusion connection, high-temperature rolling and low-temperature heat treatment.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a technical scheme that: a preparation method of a TiAl-series laminated composite board comprises the following steps:
s1, preparing materials, preparing high-temperature TiAl alloy thin plates and high-temperature Ti2An AlNb alloy thin plate;
the high-temperature TiAl alloy is Ti-43Al-4Nb-1Mo-0.1B alloy, and the high-temperature Ti2The AlNb alloy is Ti-22Al-25Nb alloy, high-temperature TiAl alloy sheet and high-temperature Ti2The thickness of the AlNb alloy sheet is 1 mm-3 mm, and the high temperature TiAl alloy sheet and the high temperature Ti are respectively2The thickness of the AlNb alloy sheet is the same, and the high-temperature TiAl alloy sheet and the high-temperature Ti are2The AlNb alloy thin plates are all obtained from forged blanks by adopting linear cutting processing.
S2, surface treatment, namely, obtaining the high-temperature TiAl alloy thin plate and high-temperature Ti2The surface to be connected of the AlNb alloy sheet is finely ground by a grinding machine, and the surface to be connected is polished by 1.5# diamond polishing paste for high-temperature TiAl alloy sheet and Ti2Polishing the surfaces to be connected of the AlNb alloy sheets, and then carrying out high-temperature TiAl alloy sheet and Ti2Immersing the AlNb alloy sheet into absolute ethyl alcohol for ultrasonic cleaning for 10-15 min, and finally, carrying out high-temperature TiAl alloy sheet and Ti2The AlNb alloy sheet samples were stored in absolute ethanol to be diffusion bonded.
S3, vacuum diffusion bonding, namely, bonding the processed high-temperature TiAl alloy thin plate with high-temperature Ti2AlNbThe alloy sheets are alternately assembled and combined and then placed into a graphite mold prepared in advance, the graphite mold is placed into a furnace chamber of a vacuum diffusion welding machine, a door of the vacuum diffusion welding machine is closed, vacuumizing operation is carried out, and when the vacuum degree of the furnace chamber of the vacuum diffusion welding machine is pumped to 5 multiplied by 10-3When the temperature is lower than Pa, the furnace temperature is increased to 930-950 ℃ in a gradient way at the temperature rise rate of 10 ℃/min, and the high-temperature TiAl alloy sheet and the high-temperature Ti are pressed by a graphite pressing head of a vacuum diffusion welding machine2Applying axial pressure of 5-10 MPa to AlNb alloy sheet alternate assembly material, wherein the axial pressure is required to be applied to high-temperature TiAl alloy sheet and high-temperature Ti2The connection plane of the AlNb alloy sheet alternate assembly material is kept vertical, and the top layer and the bottom layer of the alternate assembly material are high-temperature TiAl alloy sheets;
keeping for 90-180 min, and unloading pressure after heat preservation to ensure that the high-temperature TiAl alloy sheet and the high-temperature Ti are coated2The AlNb alloy thin plate is cooled to the room temperature along with the furnace chamber of the vacuum diffusion welding machine, and then the high-temperature TiAl alloy thin plate and the high-temperature Ti are completed2And (3) pre-preparing the AlNb alloy sheet laminated composite material.
S4, preparing a sheath assembly, wherein the sheath assembly comprises an upper sheath cover, a lower sheath cover and a middle sheath ring, the upper sheath cover and the lower sheath cover are made of stainless steel plates with the same size and thickness, the sheath ring is positioned in the center of the upper sheath cover and the center of the lower sheath cover, the sheath ring is welded to the lower sheath cover to form a sheath assembly, and the inner surface of the upper sheath cover, the inner surface of the lower sheath cover and the inner surface of the sheath ring are respectively coated with a solder stopping agent.
S5, assembling, namely spreading refractory cotton with the thickness of 5mm on the surface of a sheath assembly coated with a solder-stop agent, loading the layered composite material prepared in the S3 into a prepared sheath assembly, welding an upper sheath cover onto the sheath assembly, wherein the upper sheath cover is coaxial with the sheath assembly, and a connecting plane of the layered composite material is parallel to the upper sheath cover during assembling, so as to complete sheath of the sample;
and a hole with the size of 2mm is reserved on the sheath assembly of the sheath assembly and is used for exhausting gas during subsequent high-temperature rolling, the layered composite material prefabricated part is put into the manufactured sheath assembly, and when the upper sheath cover is welded on the sheath assembly, a hole with the size of 2mm is reserved on the upper sheath cover, and the hole on the upper sheath cover and the hole on the sheath assembly are distributed in a diagonal manner.
S6, rolling at high temperature, namely, loading the sample sheathed in the S5 into a box furnace, heating to 1200 ℃ at a constant speed of 5 ℃/min along with the furnace, preserving heat for 10-15 min, transferring the blank from the box furnace to a double-roll mill, carrying out high-temperature rolling deformation, controlling the rolling speed to be 5m/min and the inter-pass reduction to be 5-10%, transferring the blank into the box furnace after the first pass is finished, preserving heat along with the furnace, preserving heat at 1200 ℃ for 10-15 min, and then repeating the rolling process again until the required thickness of the laminated composite plate is obtained; and after rolling to the last pass, transferring the laminated composite plate into a box-type furnace to carry out furnace cooling until the laminated composite plate is cooled to room temperature.
S7, post-processing, namely removing the sheath through mechanical processing after multi-pass high-temperature rolling is finished, and polishing and cleaning the surface of the laminated composite plate;
and S8, performing heat treatment, namely performing heat treatment on the polished and cleaned laminated composite board in a vacuum box furnace or an argon-protected atmosphere furnace, wherein the heat treatment temperature is 900-1020 ℃, the heat preservation time is 30-90 min, and cooling to room temperature along with the furnace after the heat treatment is finished.
And S9, performing final treatment, performing heat treatment, and then performing mechanical processing according to design requirements to obtain the layered composite board with the designed size, thereby completing the preparation of the TiAl layered composite board.
The preparation processes in example 1, example 2 and example 3 are the same, and the process parameters of vacuum diffusion bonding, high-temperature rolling and heat treatment in example 1, example 2 and example 3 are shown in the following table 1;
TABLE 1 specific Process parameters for the examples
Figure BDA0003607860630000071
As a comparative example, the invention carries out the preparation of the plate under three processes of direct vacuum diffusion bonding, low-temperature heat treatment and vacuum diffusion bonding, high-temperature rolling and low-temperature heat treatment. The interface structure and the interface bonding force of the plate are evaluated, and the interface bonding strength of the plate under different preparation processes is specifically shown in the following table 2;
TABLE 2 interfacial bond strength of the sheets under different preparation processes
Figure BDA0003607860630000072
Figure BDA0003607860630000081
The interface structure in fig. 1 shows that the interface structure of the plate prepared by the vacuum diffusion bonding, high-temperature rolling and low-temperature heat treatment process is more uniform, no brittle compound phase exists, and the interface has fine dispersed precipitated phases, which is beneficial to improving the interface bonding strength, and the interface strength of the plate prepared by the vacuum diffusion bonding, high-temperature rolling and low-temperature heat treatment process is stronger than that of the plate prepared by other processes.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (8)

1. A preparation method of a TiAl-series laminated composite board is characterized by comprising the following steps: the method comprises the following steps:
s1, preparing materials, preparing high-temperature TiAl alloy thin plates and high-temperature Ti2An AlNb alloy thin plate;
s2, surface treatment, namely, obtaining the high-temperature TiAl alloy thin plate and high-temperature Ti2The method comprises the following steps of finely grinding the to-be-connected surface of an AlNb alloy sheet by using a grinding machine, polishing the to-be-connected surface after grinding, and then immersing the to-be-connected surface into absolute ethyl alcohol for ultrasonic cleaning for backup;
s3, vacuum diffusion bonding, namely, bonding the processed high-temperature TiAl alloy thin plate with high-temperature Ti2Alternately assembling and combining the AlNb alloy sheets, placing the AlNb alloy sheets into a graphite mold prepared in advance, placing the AlNb alloy sheets into a furnace chamber of a vacuum diffusion welding machine, closing a machine door of the vacuum diffusion welding machine, and performing vacuumizing operation to finish the high-temperature TiAl alloy sheets and the high-temperature Ti2Pre-preparing an AlNb alloy sheet laminated composite material;
s4, preparing a sheath assembly, wherein the sheath assembly comprises an upper sheath cover, a lower sheath cover and a middle sheath ring, the upper sheath cover and the lower sheath cover are made of stainless steel plates with the same size and thickness, the sheath ring is positioned in the center of the upper sheath cover and the center of the lower sheath cover, the sheath ring is welded to the lower sheath cover to form a sheath assembly, and the inner surface of the upper sheath cover, the inner surface of the lower sheath cover and the inner surface of the sheath ring are respectively coated with a solder stopping agent;
s5, assembling, namely spreading refractory cotton with the thickness of 5mm on the surface of a sheath assembly coated with a solder stop agent, loading the layered composite material prepared in the S3 into the prepared sheath assembly, welding an upper sheath cover onto the sheath assembly, wherein the upper sheath cover is coaxial with the sheath assembly, and a connection plane of the layered composite material is parallel to the upper sheath cover during assembling, so that the sheath of the sample is completed;
s6, rolling at high temperature, namely, loading the sample sheathed in the S5 into a box furnace, heating to 1200 ℃ at a constant speed of 5 ℃/min along with the furnace, preserving heat for 10-15 min, transferring the blank from the box furnace to a double-roll mill, carrying out high-temperature rolling deformation, controlling the rolling speed to be 5m/min and the inter-pass reduction to be 5-10%, transferring the blank into the box furnace after the first pass is finished, preserving heat along with the furnace, preserving heat at 1200 ℃ for 10-15 min, and then repeating the rolling process again until the required thickness of the laminated composite plate is obtained;
s7, post-processing, namely removing the sheath through mechanical processing after multi-pass high-temperature rolling is finished, and polishing and cleaning the surface of the laminated composite plate;
s8, performing heat treatment, namely performing heat treatment on the polished and cleaned laminated composite board in a vacuum box furnace or an argon-protected atmosphere furnace;
and S9, performing final treatment, performing heat treatment, and then performing mechanical processing according to design requirements to obtain the layered composite board with the designed size, thereby completing the preparation of the TiAl layered composite board.
2. The method for preparing a TiAl-based layered composite board as claimed in claim 1, wherein in S1, the high temperature TiAl alloy is Ti-43Al-4Nb-1Mo-0.1B alloy, high temperature Ti2The AlNb alloy is Ti-22Al-25Nb alloy, high-temperature TiAl alloy sheet and high-temperature Ti2The thickness of the AlNb alloy sheet is 1 mm-3 mm, and the high temperature TiAl alloy sheet and the high temperature Ti are respectively2The thickness of the AlNb alloy sheet is the same, and the high-temperature TiAl alloy sheet and the high-temperature Ti are2The AlNb alloy thin plates are all obtained from forged blanks by adopting linear cutting processing.
3. The method of claim 1, wherein the step of polishing the TiAl-based layered composite plate in S2 comprises polishing the high temperature TiAl alloy sheet and Ti with 1.5# diamond polishing paste2Polishing the surfaces to be connected of the AlNb alloy thin plates, and then carrying out high-temperature TiAl alloy thin plate and Ti2Immersing the AlNb alloy sheet into absolute ethyl alcohol for ultrasonic cleaning for 10-15 min, and finally, carrying out high-temperature TiAl alloy sheet and Ti2The AlNb alloy sheet samples were stored in absolute ethanol to be diffusion bonded.
4. The method for preparing a TiAl-based layered composite board according to claim 1, wherein the TiAl-based layered composite board is prepared by a method comprising a step of coating a TiAl-based layer on a TiAl-based layerIn S3, the vacuum pumping operation is performed when the vacuum degree of the furnace chamber of the vacuum diffusion welding machine is 5 × 10-3When the temperature is lower than Pa, the furnace temperature is increased to 930-950 ℃ in a gradient way at the temperature rise rate of 10 ℃/min, and the high-temperature TiAl alloy sheet and the high-temperature Ti are pressed by a graphite pressing head of a vacuum diffusion welding machine2Applying axial pressure of 5-10 MPa to AlNb alloy sheet alternate assembly materials, keeping for 90-180 min, unloading pressure after heat preservation is finished to enable the high-temperature TiAl alloy sheet and the high-temperature Ti to be in contact with each other2The AlNb alloy thin plate is cooled to the room temperature along with the furnace chamber of the vacuum diffusion welding machine, and then the high-temperature TiAl alloy thin plate and the high-temperature Ti are completed2And (3) pre-preparing the AlNb alloy sheet laminated composite material.
5. The method of claim 4, wherein the axial pressure is applied to the TiAl alloy sheet and the high temperature Ti2The connection plane of the AlNb alloy sheet alternate assembly material is kept vertical, and the top layer and the bottom layer of the alternate assembly material are high-temperature TiAl alloy sheets.
6. The method according to claim 1, wherein a hole having a size of 2mm is formed in the jacket assembly of the jacket assembly for exhausting gas during subsequent high-temperature rolling, and when the layered composite preform is loaded into the manufactured jacket assembly and the upper jacket cover is welded to the jacket assembly, a hole having a size of 2mm is formed in the upper jacket cover, and the hole formed in the upper jacket cover and the hole formed in the jacket assembly are diagonally distributed.
7. The method for preparing a TiAl-based laminated composite plate as claimed in claim 1, wherein the laminated composite plate is transferred to a box furnace for furnace cooling until the temperature is cooled to room temperature after the rolling in the S6 at the high temperature to the last pass.
8. The method for preparing the TiAl-based layered composite board according to claim 1, wherein the heat treatment temperature in S8 is 900-1020 ℃, the heat preservation time is 30-90 min, and the temperature is cooled to room temperature along with the furnace after the heat treatment.
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CN107699831A (en) * 2017-10-13 2018-02-16 东北大学 Pack rolling as-cast state TiAl sheet alloy method based on composite structural design
CN109468480A (en) * 2018-11-26 2019-03-15 太原理工大学 The method that the vacuum canning rolling of impulse electric field auxiliary prepares metal-base composites

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US3449705A (en) * 1966-04-21 1969-06-10 Ncr Co Photoconductive matrix sheet
CN105080999A (en) * 2015-09-16 2015-11-25 哈尔滨工业大学 Method for manufacturing TiAl/Ti alloy laminated composite plates in preheating pressing compositing and wrapping hot rolling manner
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