A method for preparing a high-temperature-resistant titanium-based composite material slab

Abstract

The application relates to a preparation method of a high-temperature-resistant titanium-based composite slab, which comprises the following steps: after the surface of a titanium-based composite ingot is processed and coated with a high-temperature-resistant and oxidation-resistant coating, heat preservation treatment is carried out in a beta+100 DEG C-beta+200 DEG C phase region, and open-die upsetting and elongation forging deformation is carried out, and the forged blank is obtained after air cooling to room temperature; after the forged blank is processed and coated with a high-temperature-resistant and oxidation-resistant coating, heat preservation treatment is carried out in a beta+50 DEG C-beta+150 DEG C phase region, upsetting and elongation are carried out; after the forged blank is processed, heat preservation treatment is carried out in a beta-10 DEG C-beta+50 DEG C phase region, and then upsetting deformation is carried out; after the obtained forged blank is processed, heat preservation treatment is carried out in a beta+50 DEG C-beta+150 DEG C phase region, and open-die upsetting and elongation forging deformation is carried out; the upsetting and elongation directions are changed; after the processed forged blank is processed, heat preservation treatment is carried out in a beta+50 DEG C-beta+150 DEG C phase region, one-way forging deformation is carried out, and air cooling to room temperature is carried out. The purpose of the preparation method of the high-temperature-resistant titanium-based composite slab is to solve the problems of large TiB size and poor uniformity distribution in the current melt-cast titanium-based composite material.

Description

Technical Field

[0001] This invention relates to the field of non-ferrous metal processing technology, and specifically to a method for preparing a high-temperature resistant titanium-based composite material slab. Background Technology

[0002] High-temperature resistant titanium-based composite materials have excellent specific strength, modulus and high-temperature resistance, making them the preferred material for high-temperature structures in aerospace and other fields. They can be used in heat-resistant structural components such as aircraft skin, firewalls, frames, beams, webs and structural skeletons, and have broad application prospects.

[0003] Due to its excellent properties, TiB has become the main reinforcing phase in titanium-based composites. However, while introducing a certain amount of TiB phase into near-α matrix titanium alloys refines the microstructure and increases the overall service temperature, the high brittleness of the reinforcing phase also significantly increases the processing difficulty of high-temperature titanium-based composites. In particular, the high deformation resistance and narrow hot working window make the processing of plates more difficult and prone to cracking. Furthermore, the TiB phase in cast high-temperature titanium-based composites is mostly in the form of long needles, which easily form chains during deformation and fracture, distributing along the deformation direction. This results in a directional distribution of the reinforcing phase, affecting the consistency of material properties. Before plate preparation, the ingot needs to be prepared into a slab of a certain thickness; the size and distribution of the reinforcing phase inside the slab closely affect the subsequent performance of the plate. Therefore, it is necessary to rationally control the slab preparation process to regulate the size and distribution of the reinforcing phase inside the slab.

[0004] Existing TiB-reinforced high-temperature titanium-based composites have the following shortcomings:

[0005] 1. Due to the addition of reinforcing phases, the high-temperature resistant titanium-based composite materials in the molten-cast state have an increased tendency to deformation and cracking, making forging and deformation processing difficult;

[0006] 2. In cast-state high-temperature resistant titanium-based composite materials, the TiB phase is mostly in the form of long needles. When deformed and fractured, it easily forms chains that are distributed along the deformation direction. This results in the directionality of the reinforcing phase distribution, which affects the consistency of the slab / plate properties.

[0007] Therefore, the inventors have provided a method for preparing a high-temperature resistant titanium-based composite material slab. Summary of the Invention

[0008] (1) Technical problems to be solved

[0009] This invention provides a method for preparing a high-temperature resistant titanium-based composite slab, which solves the technical problems of large TiB size and poor distribution uniformity in current cast titanium-based composite materials.

[0010] (2) Technical solution

[0011] This invention provides a method for preparing a high-temperature resistant titanium-based composite material slab, comprising the following steps:

[0012] Step 1: A titanium-based composite material ingot is prepared by three vacuum consumable arc melting processes;

[0013] Step 2: After processing the surface of the titanium-based composite material ingot and coating it with a high-temperature resistant and antioxidant coating, heat treatment is carried out in the β+100℃~β+200℃ phase region, followed by billet drawing and forging deformation, and then air cooling to room temperature to obtain a forging billet.

[0014] Step 3: After surface processing and coating with the high-temperature anti-oxidation coating, the forging billet is heat-preserved in the β+50℃~β+150℃ phase region, and then upsetting and drawing are performed.

[0015] Step 4: After surface treatment, the forged billet is kept at a temperature in the β-10℃~β+50℃ phase region, and then upsetting deformation is performed.

[0016] Step 5: After surface treatment of the forging billet obtained after upsetting deformation, heat treatment is carried out in the β+50℃~β+150℃ phase region, and then the billet is drawn and forged.

[0017] Step 6: Change the upsetting and drawing directions, and repeat steps 4 and 5 multiple times;

[0018] Step 7: After surface treatment of the forging billet obtained in Step 6, heat treatment is carried out in the β+50℃~β+150℃ phase region, followed by unidirectional forging deformation, and then air cooling to room temperature. After 1 to 3 heat treatments and surface processing, a high-temperature resistant titanium-based composite material slab is obtained.

[0019] Furthermore, the titanium-based composite ingot comprises a titanium-based composite matrix and a reinforcement, wherein the titanium-based composite matrix is ​​a near-α high-temperature titanium alloy, and the reinforcement comprises a TiB phase; wherein the content of the TiB phase is 1 vol.% to 8 vol.%.

[0020] Furthermore, in step 2, the holding time is 120 min to 240 min, and the deformation amount of the billet drawing and forging is 30% to 50%.

[0021] Furthermore, in step 3, the heat preservation time is 120 min to 240 min, and the deformation amount of elongation and upsetting is 20% to 40%.

[0022] Furthermore, in step 4, the heat preservation time is 120 min to 240 min, and the upsetting deformation is 30% to 50%.

[0023] Furthermore, in step 5, the holding time is 120 min to 240 min, and the deformation amount of the billet drawing and forging is 30% to 50%.

[0024] Furthermore, in step 7, the holding time is 120 min to 240 min, and the deformation amount of unidirectional forging is 30% to 70%.

[0025] Furthermore, the reinforcing agent also includes rare earth oxides and silicides.

[0026] Furthermore, the thickness of the high-temperature resistant titanium-based composite material slab is 50–120 mm.

[0027] (3) Beneficial effects

[0028] In summary, this invention refines the matrix structure through β single-phase region deformation, improves the tendency for hot working cracking, and then breaks up the larger TiB phase through quasi-β forging deformation. Furthermore, β single-phase region deformation promotes uniform TiB flow distribution and improves the micropore defects caused by TiB breakage during quasi-β forging, thus enabling TiB to achieve better distribution uniformity. Attached Figure Description

[0029] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the embodiments of the present invention will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is a flowchart illustrating one embodiment of the present invention;

[0031] Figure 2 This is a schematic diagram of the hot working deformation of the high-temperature resistant titanium-based composite material provided in the embodiment of the present invention;

[0032] Figure 3 This is a schematic diagram of the microstructure of the TiBw / Ti65 composite slab provided in Embodiment 1 of the present invention;

[0033] Figure 4 This is a schematic diagram of the microstructure of a typical forged slab. Detailed Implementation

[0034] The embodiments of the present invention will be further described in detail below with reference to the accompanying drawings and examples. The following detailed description of the embodiments and the accompanying drawings are used to illustrate the principles of the present invention by way of example, but should not be used to limit the scope of the present invention. That is, the present invention is not limited to the described embodiments, and any modifications, substitutions and improvements to the parts, components and connection methods are covered without departing from the spirit of the present invention.

[0035] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0036] Figure 1 This invention provides a method for preparing a high-temperature resistant titanium-based composite material slab, comprising the following steps:

[0037] Step 1: A titanium-based composite material ingot is prepared by three vacuum consumable arc melting processes;

[0038] Step 2: After machining the surface of the titanium-based composite material ingot and coating it with a high-temperature resistant and antioxidant coating, heat treatment is carried out in the β+100℃~β+200℃ phase region, followed by billet drawing and forging deformation, and then air cooling to room temperature to obtain the forging billet.

[0039] Step 3: After surface machining and coating with a high-temperature resistant and antioxidant coating, the forging billet is heat-treated in the β+50℃~β+150℃ phase region, and then upsetting and drawing are performed.

[0040] Step 4: After surface treatment, the forged billet is kept at a temperature in the β-10℃~β+50℃ phase region, and then upsetting deformation is performed.

[0041] Step 5: After surface treatment of the forging billet obtained after upsetting deformation, heat treatment is carried out in the β+50℃~β+150℃ phase region, and then the billet is drawn and forged.

[0042] Step 6: Change the upsetting and drawing directions, and repeat steps 4 and 5 multiple times;

[0043] Step 7: After surface treatment of the forging billet obtained in Step 6, heat treatment is carried out in the β+50℃~β+150℃ phase region, followed by unidirectional forging deformation, and then air cooling to room temperature. After 1 to 3 heat treatments and surface processing, a high-temperature resistant titanium-based composite material slab is obtained.

[0044] In the above embodiments, to address the problems of easy cracking during hot working deformation of high-temperature titanium-based composite materials and the difficulty in controlling the size and distribution of internal reinforcing phases, a multi-directional forging deformation control method combining β single-phase region forging at β+50℃~β+200℃ and quasi-β region forging at β-10℃~β+50℃ is proposed. The high-temperature β single-phase region deformation at β+50℃~β+200℃ is selected to improve the tendency of hot working cracking, promote the uniform flow and distribution of reinforcing phases, and refine the matrix structure. The forging deformation at β-10℃~β+50℃ ensures that the ingot can be forged while breaking down the larger TiB phases inside as much as possible.

[0045] High-temperature β-single-phase deformation at β+50℃ to β+200℃ improves the tendency for hot working cracking and refines the matrix structure. Quasi-β forging deformation then breaks down larger TiB phases, and further β-single-phase deformation promotes uniform TiB flow distribution and improves micropore defects caused by TiB breakage during quasi-β forging, resulting in better TiB distribution uniformity. This method solves the problems of easy cracking during low-temperature deformation of titanium-based composites and poor control of the size and distribution of reinforcing phases during high-temperature deformation, effectively improving the size and distribution uniformity of the TiB reinforcing phase.

[0046] In step 1, the diameter of the titanium-based composite ingot is not less than 180 mm. In step 3, the upsetting and drawing directions of the forging billet are changed sequentially in the X, Y, and Z directions. In step 6, the upsetting and drawing directions of the forging billet are changed sequentially in the X, Y, and Z directions.

[0047] As an optional implementation, the titanium-based composite ingot includes a titanium-based composite matrix and a reinforcement. The titanium-based composite matrix is ​​a near-α high-temperature titanium alloy, and the reinforcement includes a TiB phase. The content of the TiB phase is 1 vol.% to 8 vol.%. This determines the TiB protection range of the titanium-based composite.

[0048] As an optional implementation, in step 2, the holding time is 120 min to 240 min, and the deformation amount of the billet drawing and forging is 30% to 50%. The deformation amount is set according to the forging characteristics and the influence on the reinforcing phase.

[0049] As an optional implementation, in step 3, the holding time is 120 min to 240 min, and the deformation amount during drawing and upsetting is 20% to 40%. This deformation amount is set based on the forging characteristics and its influence on the reinforcing phase.

[0050] As an optional implementation, in step 4, the holding time is 120 min to 240 min, and the upsetting deformation is 30% to 50%. This deformation is set based on forging characteristics and its influence on the reinforcing phase.

[0051] As an optional implementation, in step 5, the holding time is 120 min to 240 min, and the deformation amount of the billet drawing and forging is 30% to 50%. The deformation amount is set according to the forging characteristics and the influence on the reinforcing phase.

[0052] As an optional implementation, in step 7, the holding time is 120 min to 240 min, and the deformation amount of unidirectional forging is 30% to 70%. This deformation range is set according to the forging characteristics to ensure slab formation.

[0053] As an optional implementation, the reinforcement also includes rare earth oxides and silicides. These are the load-bearing components in the composite material. Geometrically, reinforcements can be categorized as zero-dimensional granular, one-dimensional fibrous, two-dimensional sheet-like, and three-dimensional. Based on properties, they can be classified as inorganic or organic reinforcements, including both synthetic and natural ones. The main reinforcements are fibrous, such as inorganic glass fibers and carbon fibers, and a small amount of ceramic fibers such as silicon carbide. Organic reinforcements include aramid fibers (aramid fiber). The specific composition is not limited and is adjusted according to actual needs.

[0054] Example 1

[0055] 1. A 2.0 vol% TiBw / Ti65 composite material ingot was prepared by three vacuum self-consuming arc melting processes. The surface of the ingot was processed and coated with a high temperature resistant and anti-oxidation coating. It was then held at 1150℃ for 180 min. Then, it was subjected to billet drawing and forging deformation with a deformation amount of 30-40%. Finally, it was air-cooled to room temperature to obtain a forging billet.

[0056] 2. After surface machining to remove oxide scale and cracks, and coating with a high-temperature resistant and anti-oxidation coating, the billet is heat-treated in the 1100-1150℃ phase region for 120-180 minutes. Then, it is upsetting and drawing once each, with a drawing and upsetting deformation of 30%-40%. The upsetting and drawing directions are changed according to X, Y, Y, Z and Z, X respectively. The forging operation is repeated twice to break up and disperse the large-sized TiB phase inside the billet.

[0057] 3. After machining the surface of the forged billet and applying a high-temperature anti-oxidation coating, hold it at 1050-1060℃ for 180 minutes, and then perform upsetting deformation once, with an upsetting deformation amount of 30%-40%, in order to break up the remaining large TiB phase.

[0058] 4. The surface-treated forging billet obtained above is held at 1150℃ for 160 min to 180 min, and then subjected to billet drawing and forging deformation with a deformation amount of 30% to 40%. Then it is air-cooled to room temperature to obtain the forging billet, which promotes the flow of the broken TiB phase and improves the micropore defects formed by TiB fracture.

[0059] 5. Change the upsetting and drawing directions sequentially according to the X, Y, Y, Z and Z, X directions, and repeat steps 5 and 6 twice;

[0060] 6. After surface treatment, the obtained forging billet is held at 1100-1150℃ for 120-180 minutes, and then subjected to unidirectional forging deformation with a deformation amount of 40%-50%. After air cooling to room temperature, after two forging cycles and surface finishing, a 90mm-110mm thick slab is obtained.

[0061] The high-temperature resistant TiB / Ti65 composite slab obtained in this embodiment has a small and uniform reinforcing phase size, a relatively diffuse distribution, and no directional aggregation, resulting in fewer micropore defects.

[0062] It should be noted that the various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. The present invention is not limited to the specific steps and structures described above and shown in the figures. Furthermore, for the sake of brevity, detailed descriptions of known methods and techniques are omitted here.

[0063] The above are merely embodiments of this application and are not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art without departing from the scope of the invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of this application should be included within the scope of the claims of this application.

Claims

1. A method for producing a high-temperature-resistant titanium-based composite material slab, characterized by, The method comprises the following steps: Step 1, preparing a titanium-based composite ingot by three vacuum self-consumption arc smelting; Step 2, after surface processing and coating of a high-temperature resistant and oxidation resistant coating on the titanium-based composite ingot, heat preservation treatment is carried out in the beta+100 DEG C-beta+200 DEG C phase region, open-die upsetting and elongation forging deformation is carried out, and then air cooling is carried out to room temperature to obtain a forged blank; Step 3, after surface processing and coating of the high-temperature resistant and oxidation resistant coating on the forged blank, heat preservation treatment is carried out in the beta+50 DEG C-beta+150 DEG C phase region, and then upsetting and elongation are carried out; Step 4, after surface processing of the forged blank after forging, heat preservation treatment is carried out in the beta-10 DEG C-beta+50 DEG C phase region, and then upsetting deformation is carried out; Step 5, after surface processing of the forged blank obtained after upsetting deformation, heat preservation treatment is carried out in the beta+50 DEG C-beta+150 DEG C phase region, and then open-die upsetting and elongation forging deformation is carried out; Step 6, the direction of upsetting and elongation is changed, and steps 4 and 5 are repeated multiple times; Step 7, after surface processing of the forged blank obtained in step 6, heat preservation treatment is carried out in the beta+50 DEG C-beta+150 DEG C phase region, and then unidirectional forging deformation is carried out, and then air cooling is carried out to room temperature, 1-3 times of deformation is carried out, and surface processing is carried out to obtain a high-temperature resistant titanium-based composite plate blank.

2. The method of producing a high-temperature-resistant titanium-based composite material slab according to claim 1, characterized by, The titanium-based composite ingot comprises a titanium-based composite matrix and a reinforcing body, the titanium-based composite matrix is a near-alpha high-temperature titanium alloy, and the reinforcing body comprises a TiB phase; wherein the content of the TiB phase is 1vol.%-8vol.%.

3. The method of producing a high-temperature-resistant titanium-based composite material slab according to claim 1, characterized by, In step 2, the heat preservation time is 120min-240min, and the deformation amount of open-die upsetting and elongation forging is 30%-50%.

4. The method of producing a high-temperature-resistant titanium-based composite material slab according to claim 1, characterized by, In step 3, the heat preservation time is 120min-240min, and the deformation amount of elongation and upsetting is 20%-40%.

5. The method of producing a high-temperature-resistant titanium-based composite material slab according to claim 1, characterized by, In step 4, the heat preservation time is 120min-240min, and the deformation amount of upsetting is 30%-50%.

6. The method of producing a high-temperature-resistant titanium-based composite material slab according to claim 1, characterized by, In step 5, the heat preservation time is 120min-240min, and the deformation amount of open-die upsetting and elongation forging is 30%-50%.

7. The method of producing a high-temperature-resistant titanium-based composite material slab according to claim 1, characterized by, In step 7, the heat preservation time is 120min-240min, and the deformation amount of unidirectional forging is 30%-70%.

8. The method of producing a high-temperature-resistant titanium-based composite material slab according to claim 2, characterized by, The reinforcing body further comprises rare earth oxides and silicides.

9. The method of producing a high-temperature-resistant titanium-based composite material slab according to claim 1, characterized by, The thickness of the high-temperature resistant titanium-based composite plate blank is 50-120mm.

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