CN114700697B - Preparation method of TiAl series layered composite board - Google Patents
Preparation method of TiAl series layered composite board Download PDFInfo
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- CN114700697B CN114700697B CN202210424299.8A CN202210424299A CN114700697B CN 114700697 B CN114700697 B CN 114700697B CN 202210424299 A CN202210424299 A CN 202210424299A CN 114700697 B CN114700697 B CN 114700697B
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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
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- 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
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- 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
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- 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
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- 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
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- 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
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C14/00—Alloys based on titanium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/02—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
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/16—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of other metals or alloys based thereon
- C22F1/18—High-melting or refractory metals or alloys based thereon
- C22F1/183—High-melting or refractory metals or alloys based thereon of titanium or alloys based thereon
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- 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
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- 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
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- 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
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Abstract
The invention provides a preparation method of a TiAl series layered composite board, which comprises the following steps: first preparing high temperature TiAl alloy sheet and high temperature Ti 2 The manufacturing method comprises the steps of carrying out surface treatment on an AlNb alloy sheet, carrying out vacuum diffusion connection, then placing the sheet into a sheath assembly for high-temperature rolling, removing the sheath after the completion of multi-pass high-temperature rolling, polishing and cleaning, carrying out heat treatment, and carrying out mechanical processing according to design requirements to obtain a layered composite sheet with designed size 2 The metallurgical connection of the AlNb alloy thin plate is realized, the preparation of the laminated composite plate is realized by adopting high-temperature rolling, and finally, the double regulation and control of the thin plate structure and the reaction interface structure are realized by adopting a heat treatment process, so that the process-structure-performance integration is realized.
Description
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 the characteristics of high specific strength, gao Bigang, specific modulus and good oxidation resistance, and simultaneously has excellent high-temperature properties 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 characteristic of a self-phase structure; meanwhile, the toughness is extremely low, so that the success application of the TiAl intermetallic compound material under the conditions of high temperature and complex stress fields is directly influenced by how to improve the plasticity and toughness of the TiAl intermetallic compound. In addition, tiAl-based intermetallic compound materials are very susceptible to oxidation during preparation or processing and other intermetallic phases are generated, thereby altering the properties of the material and deteriorating its performance.
Therefore, how to avoid the above problems and improve the plasticity, toughness and strength of the TiAl intermetallic compound material is a problem to be solved at present.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a preparation method of a TiAl series layered composite board for solving the problems in the background art.
In order to solve the technical problems, the invention adopts the following technical scheme: a preparation method of a TiAl series layered composite board comprises the following steps:
s1, preparing materials, and preparing a high-temperature TiAl alloy sheet and high-temperature Ti 2 An AlNb alloy thin plate;
s2, carrying out surface treatment on the obtained high-temperature TiAl alloy sheet and high-temperature Ti 2 The surface to be connected of the AlNb alloy thin plate is finely polished by a grinder, polishing treatment is carried out on the surface to be connected after polishing,then immersing the mixture into absolute ethyl alcohol for ultrasonic cleaning, and then reserving;
s3, vacuum diffusion connection, namely the treated high-temperature TiAl alloy sheet and high-temperature Ti 2 After being alternately assembled and combined, the AlNb alloy thin plates are placed into a graphite mold which is prepared in advance, and placed into a furnace chamber of a vacuum diffusion welding machine, the door of the vacuum diffusion welding machine is closed, and vacuumizing operation is carried out, so that the high-temperature TiAl alloy thin plates and the high-temperature Ti alloy thin plates are completed 2 Preparing an AlNb alloy sheet layered composite material in advance;
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 stainless steel plates with the same size and thickness, the sheath ring is positioned at the centers of the upper sheath cover and the lower sheath cover, the sheath ring is welded to the lower sheath cover to form a sheath assembly, and the inner surfaces of the upper sheath cover, the lower sheath cover and the sheath ring are respectively smeared with a soldering flux.
S5, assembling, namely spreading refractory cotton with the thickness of 5mm on the surface of a sheath component coated with a soldering flux, loading the layered composite material prepared in the S3 into the prepared sheath assembly, welding an upper sheath cover onto the sheath assembly, and enabling a connecting plane of the layered composite material to be parallel to the upper sheath cover during assembling, so as to complete the sheath of the sample;
s6, high-temperature rolling, namely placing the sample sleeved in the S5 into a box-type 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-type furnace to a double-roller mill, performing high-temperature rolling deformation at a rolling speed of 5m/min, controlling the pressing amount between passes to be 5-10%, transferring the blank into the box-type furnace for preserving heat along with the furnace after the first pass is completed, preserving heat for 10-15 min at 1200 ℃, and repeating the rolling process again until the thickness of the required layered composite plate is obtained;
s7, after finishing multi-pass high-temperature rolling, removing the sheath by machining, and polishing and cleaning the surface of the layered composite board;
s8, heat treatment, namely performing heat treatment on the polished and cleaned layered composite board in a vacuum box furnace or an atmosphere furnace protected by argon.
S9, final treatment, machining according to design requirements after heat treatment to obtain the layered composite board with the design dimensions, and finishing 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 Ti 2 The AlNb alloy is Ti-22Al-25Nb alloy, high-temperature TiAl alloy sheet and high-temperature Ti 2 The thickness of the AlNb alloy thin plate is 1 mm-3 mm respectively, and the high temperature TiAl alloy thin plate and the high temperature Ti 2 The thickness of the AlNb alloy thin plate is the same, and the high-temperature TiAl alloy thin plate and the high-temperature Ti 2 The AlNb alloy thin plates are obtained from the blank in a forged state by wire cutting.
Preferably, the polishing treatment in S2 is performed by using a 1.5# diamond polishing paste for the high temperature TiAl alloy sheet and Ti 2 Polishing the surface to be connected of the AlNb alloy sheet, and then combining the high-temperature TiAl alloy sheet with Ti 2 Immersing the AlNb alloy sheet into absolute ethyl alcohol, ultrasonically cleaning for 10-15 min, and finally mixing the high-temperature TiAl alloy sheet with Ti 2 And (5) placing the AlNb alloy thin plate sample in absolute ethyl alcohol for preservation, and carrying out diffusion connection.
Preferably, in S3, the vacuumizing operation is performed, specifically, when the vacuum degree of the vacuum diffusion welding machine furnace chamber is pumped to below 5 multiplied by 10 < -3 > Pa, the furnace temperature gradient is increased to 930 ℃ to 950 ℃ at the heating rate of 10 ℃/min, and the graphite pressure head of the vacuum diffusion welding machine is used for heating the high-temperature TiAl alloy sheet and the high-temperature Ti alloy sheet 2 Applying 5-10 MPa axial pressure to the AlNb alloy thin plates alternately, maintaining for 90-180 min, and unloading the pressure after heat preservation to enable the high-temperature TiAl alloy thin plates and the high-temperature Ti to be achieved 2 The AlNb alloy sheet is cooled to room temperature along with the furnace chamber of the vacuum diffusion welding machine, and then the high-temperature TiAl alloy sheet and the high-temperature Ti are completed 2 And (3) preparing the AlNb alloy thin plate layered composite material.
Preferably, the axial pressure is applied in combination with a high temperature TiAl alloy sheet and a high temperature Ti 2 The connecting plane of the alternating assembly materials of the AlNb alloy thin plates is kept vertical, and the top layer and the bottom layer of the alternating assembly materials are high-temperature TiAl alloy thin plates.
Preferably, a hole with the size of 2mm is reserved on the sheath assembly of the sheath assembly and is used for exhausting gas in the subsequent high-temperature rolling, the laminated composite prefabricated part is filled into the manufactured sheath assembly, and when the upper sheath cover is welded on the sheath assembly, the 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 diagonally distributed.
Preferably, after the rolling of the high temperature rolling in S6 to the last pass, the layered composite plate is transferred to a box furnace for furnace cooling until cooling to room temperature.
Preferably, the heat treatment temperature is 900-1020 ℃ in S8, the heat preservation time is 30-90 min, and the furnace is cooled to room temperature after the heat treatment is finished.
Compared with the prior art, the invention has the following advantages:
the invention realizes high temperature TiAl alloy sheet and Ti by vacuum diffusion connection 2 And finally, realizing double regulation and control of a sheet structure and a reaction interface structure by a heat treatment process, and realizing process-structure-performance integration. The TiAl series layered composite board prepared by the method has good integrity, controllable tissue uniformity and high density, and can be used on the skin of an aerospace craft with high Mach number and other high-temperature board structures.
The technical scheme of the invention aims to solve the problems of difficult formation and low plasticity and toughness of TiAl intermetallic compounds, and the basic principle comprises the following points: (1) the TiAl intermetallic compound material is easy to oxidize, and other intermetallic compounds of other types are easy to generate by adding other alloying element materials; the high-temperature TiAl alloy has lower plasticity, but good high-temperature performance, ti 2 The AlNb alloy plastic has good 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 reserved. (2) In the preparation process of the layered composite material, the problem of interface reaction is inevitably encountered, and the vacuum diffusion connection technology can be realized by optimizing process parametersThe interface reaction layer is regulated and controlled by the number, meanwhile, the oxidation problem of TiAl series alloy can be avoided, the method is a precision molding technology, and the deformation of the base metal in the connecting process is small. Therefore, the vacuum diffusion bonding technology is suitable for preparing high-temperature TiAl alloy thin plates and Ti 2 An important method for preparing an AlNb alloy thin plate laminated composite plate. (3) The high-temperature rolling is an indispensable processing mode for preparing the plate, and the deformation behavior can promote further evolution of the layered composite material connecting interface, so that a more excellent transition layer structure is obtained. Finally, the unreacted sheet tissue and the reaction layer structure are regulated and controlled by a heat treatment process. The three process steps are mutually noninterfere, mutually complement, are mutually buckled, and the parameters among the process steps need to be strictly controlled. Therefore, the method of vacuum diffusion connection, high-temperature rolling and heat treatment is very suitable for preparing heterogeneous TiAl intermetallic compound lamellar composite plates.
Drawings
FIG. 1 is a high temperature TiAl/Ti obtained by three processes in the comparative example of the present invention 2 An ainb alloy composite sheet interfacial microstructure wherein: 1 is Ti 2 An AlNb alloy; 2 is a high temperature TiAl alloy;
(a) The interface microstructure is formed when the plates are connected in a vacuum diffusion way;
(b) The interface microstructure after the vacuum diffusion connection and low-temperature heat treatment of the plate;
(c) The method is characterized by comprising the steps of plate vacuum diffusion connection, high-temperature rolling and low-temperature heat treatment, and then interface microstructure.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention provides a technical scheme that: a preparation method of a TiAl series layered composite board comprises the following steps:
s1, preparing materials, and preparing a high-temperature TiAl alloy sheet and high-temperature Ti 2 An AlNb alloy thin plate;
the high temperature TiAl alloy is Ti-43Al-4Nb-1Mo-0.1B alloy, high temperature Ti 2 The AlNb alloy is Ti-22Al-25Nb alloy, high-temperature TiAl alloy sheet and high-temperature Ti 2 The thickness of the AlNb alloy thin plate is 1 mm-3 mm respectively, and the high temperature TiAl alloy thin plate and the high temperature Ti 2 The thickness of the AlNb alloy thin plate is the same, and the high-temperature TiAl alloy thin plate and the high-temperature Ti 2 The AlNb alloy thin plates are obtained from the blank in a forged state by wire cutting.
S2, carrying out surface treatment on the obtained high-temperature TiAl alloy sheet and high-temperature Ti 2 The surface to be connected of the AlNb alloy thin plate is finely polished by a grinder, and polishing treatment is carried out on the surface to be connected after polishing, wherein the polishing treatment is to adopt 1.5# diamond polishing paste to polish the high-temperature TiAl alloy thin plate and Ti 2 Polishing the surface to be connected of the AlNb alloy sheet, and then combining the high-temperature TiAl alloy sheet with Ti 2 Immersing the AlNb alloy sheet into absolute ethyl alcohol, ultrasonically cleaning for 10-15 min, and finally mixing the high-temperature TiAl alloy sheet with Ti 2 And (5) placing the AlNb alloy thin plate sample in absolute ethyl alcohol for preservation, and carrying out diffusion connection.
S3, vacuum diffusion connection, namely the treated high-temperature TiAl alloy sheet and high-temperature Ti 2 After being alternately assembled and combined, the AlNb alloy thin plates are placed into a graphite mold which is prepared in advance, and are 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 -3 When Pa is lower, the furnace temperature gradient is increased to 930 ℃ to 950 ℃ at the heating rate of 10 ℃/min, and the graphite pressure head of the vacuum diffusion welding machine is used for heating the high-temperature TiAl alloy sheet and the high-temperature Ti 2 The AlNb alloy thin plate is alternately assembled and dosed to apply axial pressure of 5MPa to 10MPa, and the axial pressure is applied to the high-temperature TiAl alloy thin plate and the high-temperature Ti 2 The connecting plane of the alternating assembly materials of the AlNb alloy thin plates is kept vertical, and the top layer and the bottom layer of the alternating assembly materials are high-temperature TiAl alloy thin plates;
maintaining for 90-180 min, and unloading the pressure to enable the high-temperature TiAl alloy sheet and the high-temperature Ti to be in a state of heat preservation 2 Thin AlNb alloyThe plate is cooled to room temperature along with the furnace chamber of the vacuum diffusion welding machine, thus completing the high-temperature TiAl alloy sheet and the high-temperature Ti 2 And (3) preparing the AlNb alloy thin plate layered 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 stainless steel plates with the same size and thickness, the sheath ring is positioned at the centers of the upper sheath cover and the lower sheath cover, the sheath ring is welded to the lower sheath cover to form a sheath assembly, and the inner surfaces of the upper sheath cover, the lower sheath cover and the sheath ring are respectively smeared with a soldering flux.
S5, assembling, namely spreading refractory cotton with the thickness of 5mm on the surface of a sheath component coated with a soldering flux, loading the layered composite material prepared in the S3 into the prepared sheath assembly, welding an upper sheath cover onto the sheath assembly, and enabling a connecting plane of the layered composite material to be parallel to the upper sheath cover during assembling, so as to complete the sheath of the sample;
a hole with the size of 2mm is reserved on a sheath assembly of the sheath assembly and is used for exhausting air in the subsequent high-temperature rolling, a layered composite material prefabricated member is filled into the manufactured sheath assembly, and when an upper sheath cover is welded on the sheath assembly, the 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 diagonally.
S6, high-temperature rolling, namely placing the sample sleeved in the S5 into a box-type 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-type furnace to a double-roller mill, performing high-temperature rolling deformation at a rolling speed of 5m/min, controlling the pressing amount between passes to be 5-10%, transferring the blank into the box-type furnace for preserving heat along with the furnace after the first pass is completed, preserving heat for 10-15 min at 1200 ℃, and repeating the rolling process again until the thickness of the required layered composite plate is obtained; after the rolling to the last pass, transferring the layered composite board into a box-type furnace for furnace cooling until the layered composite board is cooled to room temperature.
S7, after finishing multi-pass high-temperature rolling, removing the sheath by machining, and polishing and cleaning the surface of the layered composite board;
s8, heat treatment, namely heat treating the polished and cleaned layered composite board in a vacuum box furnace or an argon-protected atmosphere furnace at 900-1020 ℃ for 30-90 min, and cooling to room temperature along with the furnace after the heat treatment.
S9, final treatment, machining according to design requirements after heat treatment to obtain the layered composite board with the design dimensions, and finishing the preparation of the TiAl layered composite board.
The preparation process of the invention in the example 1, the example 2 and the example 3 is the same, and the process parameters of the vacuum diffusion connection, the high-temperature rolling and the heat treatment in the example 1, the example 2 and the example 3 are shown in the following table 1;
table 1 specific process parameters for each example
As a comparative example, the invention performs the preparation of the plate under three processes of direct vacuum diffusion connection, low temperature heat treatment, vacuum diffusion connection, high temperature rolling and low temperature heat treatment. The interface structure and the interface binding force of the plates are evaluated, and the interface binding strength of the plates under different preparation processes is shown in the following table 2;
TABLE 2 interfacial bonding strength of boards under different preparation processes
By combining the interface structure in the figure 1, the interface structure of the plate prepared by the vacuum diffusion connection, high-temperature rolling and low-temperature heat treatment process is more uniform, no brittle compound phase exists, and the separated phases which are distributed in a tiny and dispersive manner exist at the interface, so that the interface bonding strength is improved, and the interface strength of the plate prepared by the vacuum diffusion connection, high-temperature rolling and low-temperature heat treatment process can be found to be stronger than that of the plate prepared by other processes.
It is noted that relational terms such as first and second, and the like are 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. Moreover, 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 understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. A preparation method of a TiAl layered composite board is characterized in that: the method comprises the following steps:
s1, preparing materials, and preparing a high-temperature TiAl alloy sheet and high-temperature Ti 2 An AlNb alloy thin plate;
s2, carrying out surface treatment on the obtained high-temperature TiAl alloy sheet and high-temperature Ti 2 Finely polishing the surface to be connected of the AlNb alloy sheet by adopting a grinder, polishing the surface to be connected after polishing, then immersing the surface to be connected into absolute ethyl alcohol for ultrasonic cleaning, and cleaning for later use;
s3, vacuum diffusion connection, namely the treated high-temperature TiAl alloy sheet and high-temperature Ti 2 After being alternately assembled and combined, the AlNb alloy thin plates are placed into a graphite mold prepared in advance, placed into a furnace chamber of a vacuum diffusion welding machine, and the vacuum diffusion welding machine is closedDoor, vacuuming operation is carried out to finish high temperature TiAl alloy sheet and high temperature Ti 2 Preparing an AlNb alloy sheet layered composite material in advance; wherein the vacuumizing operation is carried out when the vacuum degree of the vacuum diffusion welding machine furnace chamber is pumped to 5 multiplied by 10 -3 When Pa is lower, the furnace temperature gradient is increased to 930 ℃ to 950 ℃ at the heating rate of 10 ℃/min, and the graphite pressure head of the vacuum diffusion welding machine is used for heating the high-temperature TiAl alloy sheet and the high-temperature Ti 2 The AlNb alloy thin plate alternate assembly material applies 5-10 MPa of axial pressure, and the axial pressure is applied to the high-temperature TiAl alloy thin plate and the high-temperature Ti 2 The connecting plane of the alternating assembly materials of the AlNb alloy thin plates is kept vertical, the top layer and the bottom layer of the alternating assembly materials are high-temperature TiAl alloy thin plates, the alternating assembly materials are kept at 90-180 min, and after heat preservation is finished, the pressure is unloaded to enable the high-temperature TiAl alloy thin plates and the high-temperature Ti alloy thin plates 2 The AlNb alloy sheet is cooled to room temperature along with the furnace chamber of the vacuum diffusion welding machine, and then the high-temperature TiAl alloy sheet and the high-temperature Ti are completed 2 Preparing an AlNb alloy sheet layered composite material in advance;
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 stainless steel plates with the same size and thickness, the sheath ring is positioned at the centers of the upper sheath cover and the lower sheath cover, the sheath ring is welded to the lower sheath cover to form a sheath assembly, and the inner surfaces of the upper sheath cover, the lower sheath cover and the sheath ring are respectively smeared with a soldering flux;
s5, assembling, namely spreading refractory cotton with the thickness of 5mm on the surface of a sheath component coated with a soldering flux, loading the layered composite material prepared in the S3 into the prepared sheath assembly, welding an upper sheath cover onto the sheath assembly, and enabling a connecting plane of the layered composite material to be parallel to the upper sheath cover during assembling, so as to complete the sheath of the sample;
s6, high-temperature rolling, namely placing the sample sleeved in the S5 into a box-type furnace, heating to 1200 ℃ along with the furnace at a constant speed of 5 ℃/min, preserving heat for 10-15 min, transferring the blank from the box-type furnace to a double-roller mill, performing high-temperature rolling deformation at a rolling speed of 5m/min, controlling the pressing amount between passes to be 5% -10%, transferring the blank into the box-type furnace to carry out furnace-following heat preservation after the first pass is finished, preserving heat for 10-15 min at a temperature of 1200 ℃, and repeating the rolling process again until the thickness of the required layered composite board is obtained;
s7, after finishing multi-pass high-temperature rolling, removing the sheath by machining, and polishing and cleaning the surface of the layered composite board;
s8, heat treatment, namely performing heat treatment on the polished and cleaned layered composite board in a vacuum box furnace or an atmosphere furnace protected by argon;
s9, final treatment, machining according to design requirements after heat treatment to obtain the layered composite board with the design dimensions, and finishing the preparation of the TiAl layered composite board.
2. The method for producing a TiAl-based layered composite sheet according to claim 1, wherein in S1, the high-temperature TiAl alloy is Ti-43Al-4Nb-1Mo-0.1B alloy, and the high-temperature Ti 2 The AlNb alloy is Ti-22Al-25Nb alloy, high-temperature TiAl alloy sheet and high-temperature Ti 2 The thickness of the AlNb alloy thin plate is 1 mm-3 mm respectively, and the high-temperature TiAl alloy thin plate and the high-temperature Ti 2 The thickness of the AlNb alloy thin plate is the same, and the high-temperature TiAl alloy thin plate and the high-temperature Ti 2 The AlNb alloy thin plates are obtained from the blank in a forged state by wire cutting.
3. The method for producing a TiAl-based layered composite sheet according to claim 1, wherein the polishing treatment in S2 is a polishing treatment of a high temperature TiAl alloy sheet and Ti with a No. 1.5 diamond polishing paste 2 Polishing the surface to be connected of the AlNb alloy sheet, and then combining the high-temperature TiAl alloy sheet with Ti 2 Immersing the AlNb alloy sheet into absolute ethyl alcohol, ultrasonically cleaning for 10-15 min, and finally mixing the high-temperature TiAl alloy sheet with Ti 2 And (5) placing the AlNb alloy thin plate sample in absolute ethyl alcohol for preservation, and carrying out diffusion connection.
4. The method of manufacturing a TiAl-based layered composite sheet according to claim 1, wherein a hole of 2mm is left in the jacket assembly of the jacket assembly for venting air during subsequent high temperature rolling, and wherein a hole of 2mm is left in the upper jacket cover when the layered composite preform is loaded into the fabricated jacket assembly and the upper jacket cover is welded to the jacket assembly, the holes in the upper jacket cover being diagonally aligned with the holes in the jacket assembly.
5. The method for producing a TiAl-based layered composite sheet according to claim 1, wherein after the rolling of the high-temperature rolling in S6 to the last pass, the layered composite sheet is transferred to a box-type furnace for furnace cooling until cooling to room temperature.
6. The method for preparing the TiAl layered composite board according to claim 1, wherein the heat treatment temperature is 900-1020 ℃ in S8, the heat preservation time is 30-90 min, and the TiAl layered composite board is cooled to room temperature along with a furnace after the heat treatment is finished.
Priority Applications (1)
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3449705A (en) * | 1966-04-21 | 1969-06-10 | Ncr Co | Photoconductive matrix sheet |
| CH363976A4 (en) * | 1976-03-10 | 1977-07-29 | ||
| 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 |
| 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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| Publication number | Priority date | Publication date | Assignee | Title |
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| CH363976A (en) * | 1955-08-26 | 1962-08-31 | Farmaceutici Italia | Process for the preparation of steroids substituted in the 2-position |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3449705A (en) * | 1966-04-21 | 1969-06-10 | Ncr Co | Photoconductive matrix sheet |
| CH363976A4 (en) * | 1976-03-10 | 1977-07-29 | ||
| 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 |
| 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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