CN111334686A - Anti-creep high-impact-toughness corrosion-resistant weldable titanium alloy and preparation method thereof - Google Patents
Anti-creep high-impact-toughness corrosion-resistant weldable titanium alloy and preparation method thereof Download PDFInfo
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Abstract
The invention belongs to the field of titanium alloy materials of deep sea engineering equipment, and discloses a creep-resistant high-impact-toughness corrosion-resistant weldable titanium alloy which comprises the following components: 4.0-8.0% of Al, 0.3-4.0% of Mo, 0.5-4.0% of Ta, 0.5-4.0% of Zr, 0.03-0.12% of O and the balance of Ti. The preparation method comprises the following steps: the preparation method comprises the following steps of proportioning according to the components of the titanium alloy, smelting and casting raw materials, cogging and forging the cast ingot, rolling and carrying out heat treatment to obtain the titanium alloy plate. The creep-resistant high-impact-toughness corrosion-resistant weldable titanium alloy has excellent compressive creep resistance, plastic toughness, mechanical property and seawater corrosion resistance, can meet special use working conditions of long-time service under deep sea high pressure, and can be used for preparing deep sea engineering equipment such as deep sea submersibles, deep sea mobile workstations, large submerged deep submarines and the like; has good application prospect and economic benefit in the fields of deep sea engineering equipment and the like.
Description
Technical Field
The invention relates to the field of titanium alloy materials for deep sea engineering equipment, in particular to a creep-resistant high-impact-toughness corrosion-resistant weldable titanium alloy and a preparation method thereof.
Background
The titanium alloy has excellent performances of high specific strength, corrosion resistance, low magnetism and the like, has obvious advantages in replacing the traditional steel material in a deep sea pressure-resistant structure, and is an ideal material for deep sea engineering equipment such as deep sea submersibles, deep sea mobile workstations, large submarine submarines and the like. With the development of deep sea engineering technology in China, the diving depth of a pressure-resistant structure is deeper and deeper, the underwater service time is longer and longer, higher requirements are provided for the comprehensive performance of a titanium alloy material, particularly the compressive creep performance of the titanium alloy, the traditional titanium alloy cannot meet the requirement of the pressure-resistant structure on long-time service under a deep sea high-pressure working condition, and the invention of a novel high-impact-toughness corrosion-resistant weldable titanium alloy material with the compressive creep performance, which can be used for a long time under the deep sea working condition, is urgently needed.
Titanium alloy is used as an excellent ocean engineering material, and a series of titanium alloys for ships are developed in Russia, America and China successively. At present, main Russian-generation alloys include PT-7M, PT-1M, PT-3V, 3M and the like, and an all-titanium nuclear submarine is built, but the titanium alloy material and the building process are highly confidential. The titanium alloy mainly applied to American ocean engineering comprises pure titanium, Ti-0.3Mo-0.8Ni, Ti-3Al-2.5V, Ti-6Al-4VELI, Ti-3Al-8V-6Cr-4Mo-4Zr and the like; the titanium alloy for ships in China mainly comprises Ti31, ZTi60, Ti70, Ti91, Ti75, Ti80, TC4ELI, TiB19 and the like, and is successfully applied to the deep-sea submersible, although the submergence depth of the deep-sea submersible is more than 6000 meters, the deep-sea submersible belongs to the working condition of deep-sea high-pressure use, the service time under the deep-sea high pressure is short, and the requirement on creep property is not high. The titanium alloys with different strength levels have good plasticity and toughness, but the compressive creep property cannot meet the special use working condition of long-time service under deep sea high pressure, for example, the titanium alloys can be subjected to long-term action of internal or external mechanical loads in the long-time use process under the deep sea working condition, so that the creep of a titanium alloy pressure-resistant structure can be caused, the size and the performance of parts can not meet the use requirements, and the safety service performance of deep sea engineering equipment is finally influenced. Therefore, aiming at the long-time use condition of deep sea high pressure, the development of the anti-creep high-impact-toughness corrosion-resistant weldable titanium alloy material is a technical problem which needs to be solved urgently.
Disclosure of Invention
Aiming at the problems and the defects in the prior art, the invention aims to provide a creep-resistant high-impact-toughness corrosion-resistant weldable titanium alloy and a preparation method thereof.
In order to realize the purpose of the invention, the technical scheme adopted by the invention is as follows:
the invention provides a creep-resistant high-impact-toughness corrosion-resistant weldable titanium alloy which comprises the following components in percentage by mass: 4.0 to 8.0 percent of Al, 0.3 to 4.0 percent of Mo, 0.5 to 4.0 percent of Ta, 0.5 to 4.0 percent of ZrC, 0.03 to 0.12 percent of O, and the balance of Ti and inevitable impurities.
According to the above-mentioned creep-resistant high impact toughness corrosion-resistant weldable titanium alloy, preferably, the creep-resistant high impact toughness corrosion-resistant weldable titanium alloy consists of the following components in percentage by mass: 4.0 to 6.0 percent of Al, 1.0 to 2.0 percent of Mo, 2.0 to 3.0 percent of Ta, 1.5 to 2.5 percent of Zr, 0.03 to 0.12 percent of O, and the balance of Ti and inevitable impurities.
Preferably, the titanium alloy is a basket structure according to the above mentioned weldable titanium alloy with creep resistance, high impact toughness and corrosion resistance.
According to the above-mentioned weldable titanium alloy with creep resistance, high impact toughness and corrosion resistance, preferably, the impurity element is C, N, H, and the mass percentage of the impurity element in the titanium alloy is: less than or equal to 0.08 percent of C, less than or equal to 0.03 percent of N and less than or equal to 0.015 percent of H.
The invention also provides a preparation method of the creep-resistant high-impact-toughness corrosion-resistant weldable titanium alloy, which comprises the following steps:
(1) smelting and ingot casting: preparing materials according to the components of the titanium alloy, and smelting and ingoting the prepared titanium alloy raw material to obtain a titanium alloy ingot;
(2) forging: cogging and forging the titanium alloy ingot prepared in the step (1) to obtain a titanium alloy plate blank with the thickness of 120-300 mm;
(3) rolling: heating the titanium alloy plate blank prepared in the step (2) to 1100 +/-15 ℃, preserving heat for 120-300 min, and then carrying out first-round rolling treatment, wherein the total deformation of the first-round rolling is 50-60%; heating the rolled titanium alloy plate blank to 1050 +/-15 ℃, and carrying out second-round rolling, wherein the total deformation of the second-round rolling is 55-65%; heating the titanium alloy plate blank after the second rolling to (T)β+40)℃～(Tβ+60)℃，TβRepresenting the temperature of the phase change point of the titanium alloy, performing third rolling, and rolling the titanium alloy plate blank to the required plate thickness; the total deformation of the third rolling is 30-50%;
(4) and (3) heat treatment: the titanium alloy plate processed by the step (3) is placed in (T)β-30)℃～(TβAnd (4) carrying out heat treatment at the temperature of minus 10) ℃ to obtain the creep-resistant high-impact-toughness corrosion-resistant weldable titanium alloy.
According to the preparation method, preferably, nine-fire drawing forging is carried out in the step (2), the initial temperature of the first-fire drawing forging is 1150 +/-30 ℃, the final forging temperature is not lower than 850 ℃, and the forging ratio is 4-6; the initial temperature of the second fire drawing forging is 1050 +/-30 ℃, the final forging temperature is not lower than 850 ℃, and the forging ratio is 6-9; the initial temperatures of the third to eighth hot drawing forgings are all (T)β+30)℃～(Tβ+50) DEG C, the finish forging temperature is not lower than 850 ℃, and the forging ratio is 4-6; the ninth heat initial temperature is (T)β+50)℃～(Tβ+80) DEG C, and the final forging temperature is not lower than 800 ℃, so that the titanium alloy plate blank with the thickness meeting the requirement is obtained after forging. In the invention, the titanium alloy ingot is drawn and forged for nine times of fire, so that the crystal grains of the titanium alloy ingot can be crushed, the structure of the titanium alloy can be adjusted, and the strength and the ductility and toughness of the titanium alloy can be improved.
According to the above production method, preferably, the heat treatment time in the step (4) is 50 to 70 min.
According to the preparation method, in the step (3), the first rolling pass is four times, and the deformation of the four rolling passes is 10%, 20%, 15% and 10% in sequence; the rolling passes of the second rolling are four, and the deformation amounts are respectively 10%, 20% and 10%; the rolling passes of the third rolling are 3 times, and the deformation of the three times of rolling is 10%, 20% and 15% respectively.
According to the preparation method, preferably, the tantalum and molybdenum elements are added in the form of titanium-tantalum and aluminum-molybdenum master alloy during the batching in the step (1), and the aluminum and the zirconium are added in the form of pure metal.
According to the preparation method, preferably, in the step (1), the titanium alloy raw material is smelted by adopting a vacuum consumable arc smelting technology, and the degree of premelting vacuum is 10-2Pa。
According to the preparation method, in the step (1), the smelting times are preferably more than or equal to 3 times to ensure that the alloy components are uniform. And after the smelting is finished, cooling the smelting liquid to form an ingot, cooling the ingot to a certain temperature under the protection of inert gas, discharging the ingot, and then turning the ingot and removing the necking.
According to the invention, the titanium alloy with the near α component design is obtained by strictly controlling the components and the contents of all elements, a basket structure can be obtained after the titanium alloy is processed, and the compression creep resistance of the alloy can be greatly improved under the condition that the strength and the plastic toughness of the titanium alloy are not reduced.
Compared with the prior art, the invention has the following positive beneficial effects:
(1) the titanium alloy has excellent compressive creep resistance, and the compressive strength R is 0.8 times that of the titanium alloypc0.2At steady state creep strain rate of 6.0 × 10 or less-10s-1And also has excellent ductility (impact toughness KV)2Not less than 47J) andseawater corrosion resistance (stress corrosion fracture toughness K)ISCC≥70MPAa·m1/2) (ii) a Meanwhile, the titanium alloy also has good mechanical property, namely tensile strength RmGreater than or equal to 860MPa, yield strength Rp0.2760MPa or more and the elongation A is 12 percent or more; compressive strength RmcNot less than 1800MPa, compressive strength Rpc0.2Not less than 1000 MPa; therefore, the creep resistance, the plastic toughness, the mechanical property and the corrosion resistance of the creep-resistant high-impact toughness corrosion-resistant weldable titanium alloy can meet the special use working condition of long-time service under deep sea high pressure, can be continuously used for more than 720 hours in deep sea below 1000 meters, and can be used for preparing deep sea engineering equipment such as a deep sea submersible, a deep sea mobile workstation, a large submarine and the like; the technical problems that the existing titanium alloy is subjected to long-term action of internal or external mechanical load in the long-term use process under deep sea working conditions, so that a titanium alloy pressure-resistant structure is subjected to creep deformation, the size and the performance of parts cannot meet the use requirements, and the safety service performance of deep sea engineering equipment is finally affected are solved.
(2) According to the invention, the titanium alloy with the component design of nearly α is obtained by strictly controlling the components and the contents of the elements, the basket structure can be obtained after the titanium alloy is processed, and the compression creep resistance of the alloy can be greatly improved under the condition that the strength and the plasticity and toughness of the titanium alloy are not reduced.
(3) The anti-creep high-impact-toughness corrosion-resistant weldable titanium alloy prepared by the invention has good cold and hot processing performance, can be formed into forgings, wide thick plates and the like, and can be welded to the forgings and the plates, and the welding coefficient is more than or equal to 0.9; the welding can be carried out by methods such as electron beam welding, laser welding, manual TIG welding and the like.
(4) The titanium alloy material prepared by the invention has good application prospect and economic benefit in the fields of deep sea engineering equipment and the like.
Drawings
FIG. 1 is an electron micrograph of the basket structure of the creep-resistant, high impact toughness, corrosion resistant weldable titanium alloy of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the following examples, which are not intended to limit the scope of the present invention.
Example 1: ti-8Al-4Mo-4Ta-4Zr-0.12O alloy
A creep-resistant high impact toughness corrosion-resistant weldable titanium alloy, which consists of the following components in percentage by mass: 8.0% of Al, 4.0% of Mo, 4.0% of Ta, 4.0% of Zr, 0.12% of O, and the balance of Ti and inevitable impurities.
The preparation method of the creep-resistant high-impact-toughness corrosion-resistant weldable titanium alloy comprises the following steps:
(1) weighing and proportioning the components of the anti-creep high-impact toughness corrosion-resistant weldable titanium alloy, and smelting the prepared titanium alloy raw material into an alloy ingot by three times of mixing, pressing an electrode rod and a vacuum consumable arc furnace, wherein the smelting vacuum degree is 10- 2Pa, then turning the ingot and removing the necking.
(2) Forging: carrying out nine-fire drawing forging on the titanium alloy ingot prepared in the step (1) (before each drawing forging, the titanium alloy ingot is firstly thickened, and then drawing forging is carried out), wherein the initial temperature of the first-fire drawing forging is 1150 ℃, the final forging temperature is not lower than 850 ℃, and the forging ratio is 5; the initial temperature of the second fire drawing forging is 1050 ℃, the final forging temperature is not lower than 850 ℃, and the forging ratio is 8; the initial temperatures of the third to eighth hot drawing forgings are all (T)β+40)℃(TβThe temperature of phase transformation point of the titanium alloy) is not lower than 850 ℃, and the forging ratio is 5; the ninth heat initial temperature is (T)βAnd +50) DEG C, the final forging temperature is not lower than 800 ℃, and a titanium alloy plate blank with the thickness composite requirement is obtained after the ninth fire drawing forging.
(3) Rolling: heating the titanium alloy plate blank prepared in the step (2) to 1100 ℃, preserving heat for 240min, and then carrying out first rolling treatment, wherein the total deformation of the first rolling is 55%; heating the rolled titanium alloy plate blank to 1050 ℃, and performing second rolling, wherein the total deformation of the second rolling is 60%; heating the titanium alloy plate blank after the second rolling to (T)β+50)℃(TβIndicating the transformation point temperature of the titanium alloy), andand performing third rolling, namely rolling the titanium alloy plate blank to the required plate thickness, wherein the total deformation of the third rolling is 45%. Wherein, the pass of the first pass rolling is four times, and the deformation of the four passes rolling is 10%, 20%, 15% and 10% in sequence; the rolling passes of the second rolling are four, and the deformation amounts are respectively 10%, 20% and 10%; the rolling passes of the third rolling pass are three, and the deformation amounts are 10%, 20% and 15% respectively.
(4) And (3) heat treatment: the titanium alloy plate processed by the step (3) is placed in (T)βAnd (3) carrying out heat treatment at-20) DEG C for 60min to obtain the creep-resistant high-impact-toughness corrosion-resistant weldable titanium alloy which is a basket structure, wherein an electron microscope photo of the titanium alloy is shown in figure 1. The results of the mechanical property test of the titanium alloy prepared in this example are shown in table 1.
Table 1 results of mechanical property measurements of titanium alloy prepared in example 1
Example 2: ti-4Al-0.3Mo-0.5Ta-0.5Zr-0.03O alloy
A creep-resistant high impact toughness corrosion-resistant weldable titanium alloy, which consists of the following components in percentage by mass: 4.0% of Al, 0.3% of Mo, 0.5% of Ta, 0.5% of Zro, 0.03% of O, and the balance of Ti and inevitable impurities.
The preparation method of the creep-resistant high-impact-toughness corrosion-resistant weldable titanium alloy comprises the following steps:
(1) weighing and proportioning the components of the anti-creep high-impact toughness corrosion-resistant weldable titanium alloy, and smelting the prepared titanium alloy raw material into an alloy ingot by three times of mixing, pressing an electrode rod and a vacuum consumable arc furnace, wherein the smelting vacuum degree is 10- 2Pa, then turning the ingot and removing the necking.
(2) Forging: carrying out nine-fire drawing forging on the titanium alloy ingot prepared in the step (1) (before each drawing forging, the titanium alloy ingot is firstly thickened and then drawn and forged), and carrying out primary drawing forging on the titanium alloy ingot in the first fire drawing forgingThe initial temperature is 1120 ℃, the final forging temperature is not lower than 850 ℃, and the forging ratio is 4; the initial temperature of the second fire drawing forging is 1080 ℃, the final forging temperature is not lower than 850 ℃, and the forging ratio is 9; the initial temperatures of the third to eighth hot drawing forgings are all (T)β+50)℃(TβThe temperature of phase transformation point of the titanium alloy) is not lower than 850 ℃, and the forging ratio is 6; the ninth heat initial temperature is (T)βAnd 80) DEG C, the finish forging temperature is not lower than 800 ℃, and a titanium alloy plate blank with the thickness meeting the requirement is obtained after the ninth fire drawing forging.
(3) Rolling: heating the titanium alloy plate blank prepared in the step (2) to 1115 ℃, preserving heat for 120min, and then carrying out first-round rolling treatment, wherein the deformation of the first-round rolling is 50%; heating the rolled titanium alloy plate blank to 1065 ℃, and performing second rolling, wherein the deformation of the second rolling is 55%; heating the titanium alloy plate blank after the second rolling to (T)β+40)℃(TβIndicating the transformation point temperature of the titanium alloy), performing third rolling to roll the titanium alloy slab to the required plate thickness, wherein the deformation of the third rolling is 50%. The number of passes of the first rolling is four; the rolling pass of the second rolling pass is four times; and the rolling pass of the third rolling is three times.
(4) And (3) heat treatment: the titanium alloy plate processed by the step (3) is below the phase transformation point (T)β-10)℃(TβIndicating the transformation point temperature of the titanium alloy) is subjected to heat treatment for 50min to obtain the anti-creep high-impact toughness corrosion-resistant weldable titanium alloy which is in a basket structure.
The results of the mechanical property test of the titanium alloy prepared in this example are shown in table 2.
Table 2 results of mechanical property measurements of titanium alloy prepared in example 2
Example 3: ti-6Al-0.3Mo-3Ta-2Zr-0.08O alloy
A creep-resistant high impact toughness corrosion-resistant weldable titanium alloy, which consists of the following components in percentage by mass: 6.0% of Al, 0.3% of Mo, 3.0% of Ta, 2.0% of Zro, 0.08% of O, and the balance of Ti and inevitable impurities.
The preparation method of the creep-resistant high-impact-toughness corrosion-resistant weldable titanium alloy comprises the following steps:
(1) weighing and proportioning the components of the anti-creep high-impact toughness corrosion-resistant weldable titanium alloy, and smelting the prepared titanium alloy raw material into an alloy ingot by three times of mixing, pressing an electrode rod and a vacuum consumable arc furnace, wherein the smelting vacuum degree is 10- 2Pa, then turning the ingot and removing the necking.
(2) Forging: carrying out nine-fire drawing forging on the titanium alloy ingot prepared in the step (1) (before each drawing forging, the titanium alloy ingot is firstly thickened, and then drawing forging is carried out), wherein the initial temperature of the first-fire drawing forging is 1180 ℃, the final forging temperature is not lower than 850 ℃, and the forging ratio is 6; the initial temperature of the second fire drawing forging is 1020 ℃, the final forging temperature is not lower than 850 ℃, and the forging ratio is 6; the initial temperatures of the third to eighth hot drawing forgings are all (T)β+30)℃(TβThe temperature of phase transformation point of the titanium alloy) is not lower than 850 ℃, and the forging ratios are all 4; the ninth heat initial temperature is (T)βAnd 60) DEG C, the finish forging temperature is not lower than 800 ℃, and a titanium alloy plate blank with the thickness meeting the requirement is obtained after the ninth fire drawing forging.
(3) Rolling: heating the titanium alloy plate blank prepared in the step (2) to 1085 ℃, preserving heat for 300min, and then carrying out first-round rolling treatment, wherein the deformation of the first-round rolling is 50%; heating the rolled titanium alloy plate blank to 1035 ℃, and performing second rolling, wherein the deformation of the second rolling is 65%; heating the titanium alloy plate blank after the second rolling to (T)β+60)℃(TβIndicating the transformation point temperature of the titanium alloy), a third rolling is performed to roll the titanium alloy slab to the required plate thickness, and the deformation amount of the third rolling is 30%.
(4) And (3) heat treatment: the titanium alloy plate processed by the step (3) is placed in (T)β-30)℃(TβRepresents titaniumPhase transformation point temperature of the alloy) for 70min to obtain the anti-creep, high-impact toughness and corrosion-resistant weldable titanium alloy which is in a basket structure.
The results of the mechanical property test of the titanium alloy prepared in this example are shown in table 3.
Table 3 results of mechanical property measurements of titanium alloy prepared in example 3
Example 4: ti-6Al-3Mo-2Ta-2Zr-0.06O alloy
A creep-resistant high impact toughness corrosion-resistant weldable titanium alloy, which consists of the following components in percentage by mass: 6.0% of Al, 3.0% of Mo, 2% of Ta, 2.0% of Zr, 0.06% of O, and the balance of Ti and inevitable impurities.
The preparation method of the creep-resistant high-impact-toughness corrosion-resistant weldable titanium alloy comprises the following steps:
(1) weighing and proportioning the components of the anti-creep high-impact toughness corrosion-resistant weldable titanium alloy, and smelting the prepared titanium alloy raw material into an alloy ingot by three times of mixing, pressing an electrode rod and a vacuum consumable arc furnace, wherein the smelting vacuum degree is 10- 2Pa, then turning the ingot and removing the necking.
(2) Forging: carrying out nine-fire drawing forging on the titanium alloy ingot prepared in the step (1) (before each drawing forging, the titanium alloy ingot is firstly thickened, and then drawing forging is carried out), wherein the initial temperature of the first-fire drawing forging is 1150 ℃, the final forging temperature is not lower than 850 ℃, and the forging ratio is 6; the initial temperature of the second fire drawing forging is 1050 ℃, the final forging temperature is not lower than 850 ℃, and the forging ratio is 7; the initial temperatures of the third to eighth hot drawing forgings are all (T)β+50)℃(TβThe temperature of phase transformation point of the titanium alloy) is not lower than 850 ℃, and the forging ratio is 6; the ninth heat initial temperature is (T)β+50) DEG C, the final forging temperature is not lower than 800 ℃, and the titanium alloy with the thickness meeting the requirement is obtained after the ninth fire drawing forgingAnd (5) a slab.
(3) Rolling: heating the titanium alloy plate blank prepared in the step (2) to 1100 ℃, preserving heat for 240min, and then carrying out first-round rolling treatment, wherein the deformation of the first-round rolling is 55%; heating the rolled titanium alloy plate blank to 1050 ℃, and performing second rolling, wherein the deformation of the second rolling is 65%; heating the titanium alloy plate blank after the second rolling to (T)β+40)℃(TβIndicating the transformation point temperature of the titanium alloy), the titanium alloy slab was rolled to the desired plate thickness, and the deformation amount of the third pass was 50%.
(4) And (3) heat treatment: the titanium alloy plate processed by the step (3) is placed in (T)β-10)℃(TβRepresenting the temperature of the transformation point of the titanium alloy) is subjected to heat treatment for 60min to obtain the anti-creep, high-impact toughness and corrosion-resistant weldable titanium alloy which is in a basket structure.
The results of the mechanical property test of the titanium alloy prepared in this example are shown in table 4.
Table 4 results of mechanical property measurements of titanium alloy prepared in example 4
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the present invention, but rather as the following description is intended to cover all modifications, equivalents and improvements falling within the spirit and scope of the present invention.
Claims (9)
1. A creep-resistant high impact toughness corrosion resistant weldable titanium alloy, characterized in that the titanium alloy consists of the following components in mass percent: 4.0 to 8.0 percent of Al, 0.3 to 4.0 percent of Mo, 0.5 to 4.0 percent of Ta, 0.5 to 4.0 percent of Zr, 0.03 to 0.12 percent of O, and the balance of Ti and inevitable impurities.
2. The creep-resistant, high impact toughness, corrosion resistant weldable titanium alloy of claim 1, wherein the titanium alloy is comprised of, in mass percent: 4.0 to 6.0 percent of Al, 1.0 to 2.0 percent of Mo, 2.0 to 3.0 percent of Ta, 1.5 to 2.5 percent of Zr, 0.03 to 0.12 percent of O, and the balance of Ti and inevitable impurities.
3. The creep-resistant, high impact toughness, corrosion resistant weldable titanium alloy of claim 1 wherein the titanium alloy is a basket structure.
4. A preparation method of a creep-resistant high-impact-toughness corrosion-resistant weldable titanium alloy is characterized by comprising the following steps:
(1) smelting and ingot casting: the titanium alloy composition of any one of claims 1 to 3 is proportioned, and the prepared titanium alloy raw material is smelted and cast to obtain a titanium alloy ingot;
(2) forging: cogging and forging the titanium alloy ingot prepared in the step (1) to obtain a titanium alloy plate blank with the thickness of 120-300 mm;
(3) rolling: heating the titanium alloy plate blank prepared in the step (2) to 1100 +/-15 ℃, preserving heat for 120-300 min, and then carrying out first-round rolling treatment, wherein the total deformation of the first-round rolling is 50-60%; heating the rolled titanium alloy plate blank to 1050 +/-15 ℃, and carrying out second-round rolling, wherein the total deformation of the second-round rolling is 55-65%; heating the titanium alloy plate blank after the second rolling to (T)β+40）℃～（Tβ+60）℃，TβRepresenting the temperature of the phase change point of the titanium alloy, performing third rolling, and rolling the titanium alloy plate blank to the required plate thickness; the total deformation of the third rolling is 30-50%;
(4) and (3) heat treatment: the titanium alloy plate processed by the step (3) is placed in (T)β-30）℃～（TβAnd (4) carrying out heat treatment at the temperature of minus 10) ℃ to obtain the creep-resistant high-impact-toughness corrosion-resistant weldable titanium alloy.
5. The preparation method according to claim 4, wherein nine times of hot drawing forging is performed in the step (2), the initial temperature of the first time of hot drawing forging is 1150 +/-30 ℃, the finish forging temperature is not lower than 850 ℃, and the forging ratio is 4-6; second oneThe initial temperature of the hot drawing forging is 1050 +/-30 ℃, the final forging temperature is not lower than 850 ℃, and the forging ratio is 6-9; the initial temperatures of the third to eighth hot drawing forgings are all (T)β+30）℃～（Tβ+50) DEG C, the finish forging temperature is not lower than 850 ℃, and the forging ratio is 4-6; the ninth hot drawing forging initial temperature is (T)β+50）℃～（Tβ+80) DEG C, and the final forging temperature is not lower than 800 ℃, so that the titanium alloy plate blank with the thickness meeting the requirement is obtained after forging.
6. The production method according to claim 5, wherein the heat treatment time in the step (4) is 50 to 70 min.
7. The preparation method according to claim 6, wherein in the step (3), the first rolling pass is four, and the deformation of the four rolling passes is 10%, 20%, 15% and 10% in sequence; the rolling passes of the second round of rolling are four, and the deformation of the four passes of rolling is 10%, 20% and 10% respectively; the rolling passes of the third rolling pass are three times, and the deformation of the three rolling passes is 10%, 20% and 15% respectively.
8. The method according to claim 6, wherein the tantalum and molybdenum elements are added as titanium-tantalum and aluminum-molybdenum master alloys and the aluminum and zirconium are added as pure metals during the compounding in step (1).
9. The preparation method according to claim 6, wherein in the step (1), the titanium alloy raw material is smelted by adopting a vacuum consumable arc smelting technology, and the degree of premelting vacuum is 10-2Pa。
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