CN115612956B - Cold forming preparation method of high-plasticity metastable beta titanium alloy plate - Google Patents
Cold forming preparation method of high-plasticity metastable beta titanium alloy plate Download PDFInfo
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- 239000000956 alloy Substances 0.000 title claims abstract description 114
- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 75
- 229910001040 Beta-titanium Inorganic materials 0.000 title claims abstract description 46
- 238000002360 preparation method Methods 0.000 title claims abstract description 21
- 229910001069 Ti alloy Inorganic materials 0.000 claims abstract description 48
- 238000010273 cold forging Methods 0.000 claims abstract description 31
- 238000005097 cold rolling Methods 0.000 claims abstract description 27
- 238000000034 method Methods 0.000 claims abstract description 26
- 238000000137 annealing Methods 0.000 claims abstract description 18
- 238000010791 quenching Methods 0.000 claims abstract description 18
- 230000000171 quenching effect Effects 0.000 claims abstract description 18
- 239000013078 crystal Substances 0.000 claims abstract description 10
- 230000009467 reduction Effects 0.000 claims description 18
- 239000000463 material Substances 0.000 claims description 11
- 238000001816 cooling Methods 0.000 claims description 9
- 239000006104 solid solution Substances 0.000 claims description 9
- 239000000243 solution Substances 0.000 claims description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 230000008569 process Effects 0.000 abstract description 12
- 238000010438 heat treatment Methods 0.000 abstract description 11
- 239000011159 matrix material Substances 0.000 abstract description 8
- 230000000694 effects Effects 0.000 abstract description 5
- 238000005482 strain hardening Methods 0.000 abstract description 5
- 238000009826 distribution Methods 0.000 abstract description 3
- 230000003213 activating effect Effects 0.000 abstract description 2
- 238000007670 refining Methods 0.000 abstract description 2
- 238000005096 rolling process Methods 0.000 description 16
- 230000009466 transformation Effects 0.000 description 7
- 238000012545 processing Methods 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000009864 tensile test Methods 0.000 description 5
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 239000010936 titanium Substances 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 229910052719 titanium Inorganic materials 0.000 description 2
- 229910004688 Ti-V Inorganic materials 0.000 description 1
- 229910010968 Ti—V Inorganic materials 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
- 230000002860 competitive effect Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000013000 roll bending Methods 0.000 description 1
- -1 rolling Substances 0.000 description 1
- 238000004098 selected area electron diffraction Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000004627 transmission electron microscopy Methods 0.000 description 1
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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
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
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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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- 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
- C22F1/002—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working by rapid cooling or quenching; cooling agents used therefor
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Abstract
The invention discloses a cold forming preparation method of a high-plasticity metastable beta titanium alloy plate, which comprises the steps of firstly, carrying out cold forging on a titanium alloy material to form a kink zone in a beta matrix, and then, carrying out room-temperature cold rolling on the titanium alloy material to obtain the metastable beta titanium alloy plate; finally, carrying out short-time annealing treatment on the metastable beta titanium alloy plate, quenching to room temperature, activating kink deformation in beta crystals through high-speed stamping of cold forging, dividing and refining beta grains by a kink zone, and improving the plasticity of the cold-rolled plate and maintaining high strength by the generated dynamic Hall-Petch effect; on the other hand, the low-density dislocation distribution in the kink belt enables the kink belt to have enough deformability to coordinate plasticity, the short-time annealing heat treatment performed after the cold rolling process can annihilate part of dislocation brought by cold working, the situation of severe entanglement of dislocation is avoided, and the dislocation configuration of the kink belt is maintained, so that the plasticity performance of the cold-rolled sheet is greatly improved and high strength is maintained.
Description
Technical Field
The invention relates to the technical field of titanium alloy processing, in particular to a cold forming preparation method of a high-plasticity metastable beta titanium alloy plate.
Background
Titanium and titanium alloys have become important structural materials because of their low density, high specific strength, excellent fatigue properties, corrosion resistance, and many other excellent properties. Titanium processing materials include a variety of product forms such as bars, plates, tubes, wires, and the like. The plate is used as an important titanium processing material and is widely applied to industries such as aviation, aerospace, petroleum, chemical industry and the like, for example, the plate is used for manufacturing an aircraft fuselage frame, a flap rib, a wide chord fan blade, a plate heat exchanger, a condenser and the like. Various techniques have been developed for the formation of titanium alloy sheet materials such as rolling, rubber bag hydraulics, numerical control Meng La, drawing, roll bending, superplastic forming/diffusion bonding, and the like. In the aspect of the processing and preparation technology of the titanium alloy plate, china has made obvious progress through the development of recent decades, but compared with foreign countries, the production of the domestic titanium alloy plate still has a certain gap in the aspects of equipment conditions, production technology and product quality. How to innovate the process, improve the performance of the titanium alloy plate and improve the quality of the product becomes the technical problem to be solved urgently at present.
As more beta stabilizing elements are added into the metastable beta titanium alloy, the high-temperature beta phase of the alloy can be reserved after solution quenching. The high symmetry of the beta phase crystal structure provides good coordination of deformation such that the alloy exhibits lower deformation resistance in terms of macroscopic properties. Thus, such alloys can generally be cold worked to produce profiles, for example cold rolled to produce titanium alloy sheet. This shaping is different from hot working in that no heating is required during production. Therefore, the relative requirements on rolling equipment are low, the energy consumption is low, and the energy is saved and the environment is protected. The cold rolling process of metastable beta titanium alloys is microscopically a process in which dislocations dominate the deformation, propagate, accumulate coordinated strain, and remain in the structure. The strengthening of dislocation (or work hardening) caused by dislocation in the process leads to the increase of the strength and the decrease of the plasticity of the titanium alloy sheet after cold rolling. Therefore, metastable beta titanium alloy sheets generally have the performance characteristics of high strength but low plasticity. The low plasticity is unfavorable for the subsequent product molding of the plate, and brittle fracture easily occurs in the service process due to poor overload bearing capacity, so that the components are invalid and even safety risks are brought. Although the plasticity can be raised to some extent by the post-annealing treatment, this is at the expense of the strength of the sheet, reducing the strength properties of the sheet. Therefore, how to obtain high plasticity while maintaining high strength of the titanium alloy cold-rolled sheet becomes a common technical problem to be solved in the current titanium alloy sheet processing industry.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a cold forming preparation method of a high-plasticity metastable beta titanium alloy plate, and the obtained titanium alloy plate has high tensile strength and obviously improved plasticity.
The invention is realized by the following technical scheme:
a cold forming preparation method of a high-plasticity metastable beta titanium alloy plate comprises the following steps:
step 1, performing cold forging on a titanium alloy material, wherein the deformation of the titanium alloy material is 5-20%;
step 2, cold rolling the titanium alloy material obtained in the step 1 at room temperature to obtain a metastable beta titanium alloy plate;
and 3, carrying out short-time annealing treatment on the metastable beta titanium alloy plate obtained in the step 2 in an alpha+beta double-phase region, wherein the annealing time is less than or equal to 30s, and then quenching to room temperature to obtain the high-plasticity metastable beta titanium alloy plate.
Preferably, the titanium alloy material is first subjected to solution treatment, and then the solution-treated titanium alloy material is subjected to cold forging.
Preferably, the solution treatment method is as follows:
the titanium alloy material is kept for 2 hours in a beta single-phase region at 950 ℃, and then water quenched to room temperature.
Preferably, the cold forging in step 1 is cold forging at room temperature.
Preferably, the total reduction of the cold forging of step 1 and the cold rolling of step 2 is 40 to 80%.
Preferably, the single pass reduction in the cold rolling in step 2 is 0.3mm and the roll speed is 40 rpm.
Preferably, the annealing temperature in the step 3 is 780-850 ℃.
Preferably, the quenching mode is water-cooling quenching.
Compared with the prior art, the invention has the following beneficial technical effects:
the invention provides a cold forming preparation method of a high-plasticity metastable beta titanium alloy plate, which is technically characterized in that cold forging processing with a certain deformation is performed on metastable beta titanium alloy in advance before cold rolling, and kink deformation in beta crystal is activated through high-speed stamping of cold forging, so that a kink band is formed in a microstructure. The formation of kink bands causes localized strain concentrations in the tissue, resulting in a change in the crystalline orientation of the kink bands relative to the beta matrix. Meanwhile, the cold forging is performed to distribute high-density dislocation along the boundary of the kink zone to form dislocation walls, dislocation cell and other dislocation configurations, and the dislocation walls, the dislocation cells and the dislocation cell are distributed into low-density dislocation areas in the kink zone. The local change of the grain orientation and the formation of dislocation configuration have good coordination effect on the deformation of the cold-rolled sheet. On one hand, the kink zone formed by cold forging is divided into refined beta grains, and the generated dynamic Hall-Petch effect improves the plasticity of the cold-rolled sheet and maintains high strength; on the other hand, the low density dislocation distribution within the kink zone is such that it has sufficient deformability to coordinate plasticity. Meanwhile, the short-time annealing heat treatment performed after the cold rolling process can annihilate dislocation brought by cold working to a certain extent, so that the situation of severe dislocation entanglement is avoided, but the dislocation configuration of the kink belt is reserved in time, so that the plasticity of the sheet is improved, the room-temperature tensile strength of the prepared titanium alloy sheet is 997-1455MPa, and the total elongation is 13-24%, therefore, the plasticity performance of the cold-rolled sheet is greatly improved and high strength is maintained, and the traditional titanium alloy sheet subjected to direct cold rolling only obtains high strength but the plasticity is sharply reduced. The titanium alloy plate prepared by the method still maintains ultrahigh plasticity after being subjected to work hardening, and shows obvious strong plasticity matching advantages.
Drawings
FIG. 1 is a plot of room temperature tensile properties for inventive example 1 and comparative example 1;
FIG. 2 is a plot of room temperature tensile properties for inventive example 2 and comparative example 2;
FIG. 3 is a graph of kink zone profile under a scanning electron microscope in accordance with example 1 of the present invention;
FIG. 4 is a graph of dislocation configuration profile under a transmission electron microscope according to example 1 of the present invention;
fig. 5 (a) is a bright field image of kink bands under a transmission electron microscope of example 2 of the present invention, (b) is a bright field image of a β matrix, and the inset is a selected area electron diffraction spot.
Detailed Description
The invention will now be described in further detail with reference to the accompanying drawings, which illustrate but do not limit the invention.
A cold forming preparation method of a high-plasticity metastable beta titanium alloy plate comprises the following steps:
step 1, performing solution treatment on metastable beta-type titanium alloy in a beta single-phase region;
specifically, the metastable beta titanium alloy is subjected to heat preservation in a beta single-phase region at 950 ℃ in a heat treatment furnace for 2 hours, and then is subjected to water cooling quenching to room temperature, so that beta grains with the size of 200-300 mu m are obtained;
step 2, carrying out cold forging on the alloy solid solution material obtained in the step 1 to form a kink zone in the beta matrix;
specifically, cold forging is carried out on the titanium alloy material subjected to solid solution at room temperature, wherein the deformation amount of the titanium alloy material is 5-20%, and kink bands are formed in beta crystals;
step 3, cold rolling the titanium alloy material obtained in the step 2 at room temperature to obtain a metastable beta titanium alloy plate;
specifically, cold rolling the cold-forged titanium alloy material at room temperature, wherein the single-pass rolling reduction is 0.3mm, and the roller speed is 40 revolutions per minute until the total rolling reduction of the alloy is 40% -80%;
and 4, carrying out short-time annealing treatment on the metastable beta titanium alloy plate obtained in the step 3 in an alpha+beta double-phase region, and then quenching to room temperature to annihilate dislocation parts in the tissues and keep kink bands, so as to obtain the high-plasticity metastable beta titanium alloy plate.
Specifically, the cold rolled titanium alloy sheet is annealed for 10-30 s at 780-850 ℃ below the beta transformation point for short time, and then quenched to room temperature, so as to obtain the metastable beta titanium alloy sheet with ultrahigh plasticity.
After room temperature tensile test, the metastable beta titanium alloy sheet prepared by the method finds that a small amount of slip bands on the beta matrix pass through the boundary of the kink bands and end inside the kink bands (as shown in fig. 3), which shows that the kink bands have a certain blocking effect on the expansion of slip lines. The comparison of the scanning morphology graphs before and after the tensile test shows that the kink band in the alloy plate after the tensile test has bending deformation, which shows that the kink band has a certain deformation coordination function.
Example 1:
a cold forming preparation method of a high-plasticity metastable beta titanium alloy plate comprises the following steps:
step 1, preserving heat of a Ti-11V metastable beta titanium alloy with the thickness of 5mm in a heat treatment furnace at 950 ℃ for 2 hours, and then quenching to room temperature;
and 2, performing cold forging deformation at room temperature with the deformation amount of 10% on the solid solution alloy material obtained in the step 1, and forming kink bands in beta crystals, wherein the thickness of the alloy material after cold forging is 4.5mm.
And 3, cold rolling the cold forging alloy material obtained in the step 2 at room temperature, wherein the single-pass rolling reduction is 0.3mm, the roller speed is 40 revolutions per minute until the total rolling reduction of the alloy is 40%, and the thickness of the rolled alloy material is 3mm.
And 4, carrying out short-time annealing for 10 seconds at the temperature below the beta transformation point of 850 ℃ on the alloy cold-rolled sheet obtained in the step 3, and then cooling the alloy cold-rolled sheet to room temperature by water to obtain the Ti-11V high-strength titanium alloy sheet with ultrahigh plasticity.
The room-temperature tensile strength of the alloy plate obtained by the method is 1065MPa, and the total elongation reaches 24%. After being characterized by a transmission electron microscope, the inside of the sample is found to have a plurality of dislocation configurations (shown in figure 4) such as single dislocation, dislocation cells, dislocation walls, dislocation meshes and the like on a beta matrix besides kinking deformation bands.
Example 2:
a cold forming preparation method of a high-plasticity metastable beta titanium alloy plate comprises the following steps:
step 1, preserving heat of a Ti-11V metastable beta titanium alloy with the thickness of 5mm in a heat treatment furnace at 950 ℃ for 2 hours, and then quenching to room temperature;
and 2, performing cold forging deformation at room temperature with the deformation amount of 10% on the solid solution alloy material obtained in the step 1, and forming kink bands in beta crystals, wherein the thickness of the alloy material after cold forging is 4.5mm.
And 3, cold rolling the cold forging alloy material obtained in the step 2 at room temperature, wherein the single-pass rolling reduction is 0.3mm, the roller speed is 40 revolutions per minute until the total rolling reduction of the alloy is 70%, and the thickness of the rolled alloy material is 1.5mm.
And 4, carrying out short-time annealing for 10 seconds at 850 ℃ below the beta transformation point on the alloy cold-rolled sheet obtained in the step 3, and then cooling the alloy cold-rolled sheet to room temperature by water to obtain the Ti-11V high-strength metastable beta-Ti alloy sheet with ultrahigh plasticity.
The true stress strain curve of the alloy plate obtained by the method shows that the room temperature tensile strength of the alloy plate is 1378MPa, and the total elongation reaches 15%. The nano hardness test shows that the hardness of the inner part of the kink band is 4.12GPa, and the hardness of the beta matrix is 4.61GPa, which shows that the boundary of the kink band has high dislocation density, and the inner part of the kink band is a softening area. Transmission electron microscopy characterization revealed that the β -grains were nanocrystallized except for the various dislocation configurations contained in the tissue, while the kinked bands remained intact (as shown in FIG. 5).
Example 3:
a cold forming preparation method of a high-plasticity metastable beta titanium alloy plate comprises the following steps:
step 1, preserving heat of a Ti-11V metastable beta titanium alloy with the thickness of 5mm in a heat treatment furnace at 950 ℃ for 2 hours, and then quenching to room temperature;
and 2, performing cold forging deformation at room temperature, wherein the deformation amount of the solid solution alloy material obtained in the step 1 is 5%, and forming kink bands in beta crystals, wherein the thickness of the alloy material after cold forging is 4.75mm.
And 3, cold rolling the cold forging alloy material obtained in the step 2 at room temperature, wherein the single-pass rolling reduction is 0.3mm, the roller speed is 40 revolutions per minute until the total rolling reduction of the alloy is 40%, and the thickness of the rolled alloy material is 3mm.
And 4, carrying out short-time annealing for 20s at the temperature below the beta transformation point of 780 ℃ on the alloy cold-rolled sheet obtained in the step 3, and then cooling the alloy cold-rolled sheet to room temperature by water to obtain the Ti-11V high-strength metastable beta-Ti alloy sheet with ultrahigh plasticity.
The room temperature tensile strength of the alloy plate obtained by the method is 997MPa, and the total elongation reaches 22%.
Example 4:
a cold forming preparation method of a high-plasticity metastable beta titanium alloy plate comprises the following steps:
step 1, preserving heat of a Ti-11V metastable beta titanium alloy with the thickness of 5mm in a heat treatment furnace at 950 ℃ for 2 hours, and then quenching to room temperature;
and 2, performing cold forging deformation at room temperature with the deformation amount of 20% on the solid solution alloy material obtained in the step 1, and forming a kink zone in the beta crystal, wherein the thickness of the alloy material after cold forging is 4.0mm.
And 3, cold rolling the cold forging alloy material obtained in the step 2 at room temperature, wherein the single-pass rolling reduction is 0.3mm, the roller speed is 40 revolutions per minute until the total rolling reduction of the alloy is 80%, and the thickness of the rolled alloy material is 1.0mm.
And 4, carrying out short-time annealing for 30s at 800 ℃ below the beta transformation point on the alloy cold-rolled sheet obtained in the step 3, and then cooling the alloy cold-rolled sheet to room temperature by water to obtain the Ti-11V high-strength metastable beta-Ti alloy sheet with ultrahigh plasticity.
The alloy plate obtained by the method has the room-temperature tensile strength of 1455MPa and the total elongation of 13 percent.
Comparative example 1:
a cold forming preparation method of metastable beta-type titanium alloy sheet material with deformation of 40% comprises the following steps:
step 1, preserving heat of a Ti-11V metastable beta titanium alloy with the thickness of 5mm in a heat treatment furnace at 950 ℃ for 2 hours, and then quenching to room temperature;
and 2, directly cold-rolling the solid solution alloy material obtained in the step 1 at room temperature, wherein the single-pass rolling reduction is 0.3mm, the roller speed is 40 revolutions per minute until the total rolling reduction of the alloy is 40%, and the thickness of the rolled alloy material is 3mm.
And step 3, carrying out short-time annealing on the alloy rolled plate obtained in the step 2 at a temperature below the beta transformation point of 850 ℃ for 10 seconds, and then cooling the alloy rolled plate to room temperature.
The real stress strain curve obtained by room temperature tensile test of the cold rolled Ti-11V metastable beta titanium alloy plate obtained by the method shows that the room temperature tensile strength is 1000MPa and the total elongation is 3.9% (shown in figure 1). Compared with the room temperature tensile strength of 1065MPa and the total elongation of 24% in example 1, the direct cold rolling process achieves high strength while the plasticity is greatly reduced. That is, by introducing the cold forging process, the cold rolled sheet can be made to have greatly improved plasticity while maintaining high strength.
Comparative example 2:
a cold forming preparation method of metastable beta-type titanium alloy sheet with deformation of 70% comprises the following steps:
step 1, preserving heat of a Ti-V metastable beta titanium alloy with the thickness of 5mm in a heat treatment furnace at 950 ℃ for 2 hours, and then quenching to room temperature;
and 2, directly cold-rolling the solid solution alloy material obtained in the step 1 at room temperature, wherein the single-pass rolling reduction is 0.3mm, the roller speed is 40 revolutions per minute until the total rolling reduction of the alloy is 70%, and the thickness of the rolled alloy material is 1.5mm.
And step 3, carrying out short-time annealing on the alloy rolled plate obtained in the step 2 at a temperature below the beta transformation point of 850 ℃ for 10 seconds, and then cooling the alloy rolled plate to room temperature.
The real stress strain curve obtained by room temperature tensile test of the cold rolled Ti-11V metastable beta titanium alloy plate obtained by the method shows that the room temperature tensile strength is 1368MPa and the total elongation is 6% (shown in figure 2). Compared with the room temperature tensile strength 1378MPa and the total elongation 15% of example 2, the direct cold rolling process achieves high strength while the plasticity is greatly reduced. That is, by introducing the cold forging process, the cold rolled sheet can be made to have greatly improved plasticity while maintaining high strength.
The invention discloses a cold forming preparation method of a high-plasticity metastable beta titanium alloy plate, which comprises the steps of firstly, carrying out cold forging on a titanium alloy material to form a kink zone in a beta matrix, and then, carrying out room-temperature cold rolling on the titanium alloy material to obtain the metastable beta titanium alloy plate; finally, carrying out short-time annealing treatment on the metastable beta titanium alloy plate, quenching to room temperature, activating kink deformation in beta crystals through high-speed stamping of cold forging, dividing and refining beta grains by a kink zone, and improving the plasticity of the cold-rolled plate and maintaining high strength by the generated dynamic Hall-Petch effect; on the other hand, the low-density dislocation distribution in the kink belt enables the kink belt to have enough deformability to coordinate plasticity, the short-time annealing heat treatment performed after the cold rolling process can annihilate part of dislocation brought by cold working, the situation of severe entanglement of dislocation is avoided, and the dislocation configuration of the kink belt is maintained, so that the plasticity performance of the cold-rolled sheet is greatly improved and high strength is maintained.
The cold forming preparation method prepares the Ti-11V metastable beta titanium alloy cold-rolled sheet with the total deformation of 40 percent and 70 percent respectively. The room-temperature tensile strength of the titanium alloy plate with the total deformation of 40% is 1065MPa, the total elongation is 24% (shown in figure 1), the room-temperature tensile strength of the titanium alloy plate with the total deformation of 70% is 1378MPa, and the total elongation is 15% (shown in figure 2). Compared with the conventional cold rolling preparation method of comparative examples 1 and 2, the titanium alloy sheet material directly subjected to cold rolling only obtains high strength but has sharply reduced plasticity, and the titanium alloy sheet material prepared by the method remarkably improves the plasticity while obtaining high tensile strength and shows obvious strong plasticity matching advantage, so that the cold forming preparation method has great competitive advantage in the titanium alloy sheet material manufacturing process.
The above is only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited by this, and any modification made on the basis of the technical scheme according to the technical idea of the present invention falls within the protection scope of the claims of the present invention.
Claims (4)
1. The cold forming preparation method of the high-plasticity metastable beta titanium alloy plate is characterized by comprising the following steps of:
step 1, firstly, carrying out solution treatment on a titanium alloy material, and then carrying out cold forging at room temperature, wherein the deformation of the titanium alloy material after solution treatment is 5-20%, so that kink bands are generated in crystal grains of the titanium alloy;
the solid solution treatment method comprises the steps of preserving the temperature of a titanium alloy material in a beta single-phase region at 950 ℃ for 2 hours, and then quenching the titanium alloy material to room temperature by water;
step 2, cold rolling the titanium alloy material obtained in the step 1 at room temperature to obtain a metastable beta titanium alloy plate;
and 3, carrying out short-time annealing treatment on the metastable beta titanium alloy plate obtained in the step 2 in an alpha+beta dual-phase region, wherein the annealing time is less than or equal to 30s, and then quenching to room temperature at 780-850 ℃ to obtain the high-plasticity metastable beta titanium alloy plate.
2. The cold forming preparation method of the high-plasticity metastable beta titanium alloy sheet material according to claim 1, wherein the total reduction of the cold forging in the step 1 and the cold rolling in the step 2 is 40-80%.
3. The method for cold forming a metastable beta titanium alloy sheet with high plasticity according to claim 1, wherein the single pass reduction in the cold rolling in the step 2 is 0.3mm, and the roll speed is 40 rpm.
4. The method for preparing the high-plasticity metastable beta titanium alloy sheet material by cold forming according to claim 1, wherein the quenching mode is water-cooling quenching.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112962040A (en) * | 2021-01-27 | 2021-06-15 | 西安理工大学 | Rapid heat treatment method for high-strength medical titanium alloy bar |
| JP2021102225A (en) * | 2019-12-25 | 2021-07-15 | 国立大学法人豊橋技術科学大学 | Processing method of pure titanium metal material |
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|---|---|---|---|---|
| JP2021102225A (en) * | 2019-12-25 | 2021-07-15 | 国立大学法人豊橋技術科学大学 | Processing method of pure titanium metal material |
| CN112962040A (en) * | 2021-01-27 | 2021-06-15 | 西安理工大学 | Rapid heat treatment method for high-strength medical titanium alloy bar |
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