CN110951994A - High-strength high-dynamic-tearing-energy titanium alloy and preparation method and application thereof - Google Patents
High-strength high-dynamic-tearing-energy titanium alloy and preparation method and application thereof Download PDFInfo
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Abstract
The invention provides a high-strength high-dynamic tearing-energy titanium alloy and a preparation method and application thereof, belonging to the technical field of titanium alloys. The titanium alloy with high strength and high dynamic tearing energy provided by the invention comprises the following components in percentage by weight: 4 to 6 percent of Al, 1.5 to 2.5 percent of Nb, 1.5 to 2.5 percent of Zr, 1.0 to 1.5 percent of V, 0.6 to 0.9 percent of Mo, 0.5 to 0.8 percent of Cr, 0.3 to 0.4 percent of Fe, and the balance of Ti and inevitable impurities. The titanium alloy provided by the invention has the tensile strength of more than 900MPa and the V-shaped impact toughness of 50J/cm2The titanium alloy has excellent processing performance and is not easy to crack, and the excellent performance can be obtained by common heat treatment and double heat treatment.
Description
Technical Field
The invention relates to the technical field of titanium alloy, in particular to a high-strength high-dynamic tearing-energy titanium alloy and a preparation method and application thereof.
Background
The titanium alloy for ships is required to have not only strength and corrosion resistance but also excellent toughness. At present, the strength of the commonly used titanium alloy for the ship is mostly lower than 1000MPa, and the high strength and the high toughness are difficult to obtain at the same time. For example, the American Ti5111 titanium alloy has the tensile strength of 800MPa and the V-shaped impact toughness of 50-80J/cm2The dynamic tearing energy is 350-600J, and the steel has good toughness but low strength. Representative domestic titanium alloys for ships include TC4ELI titanium alloy and Ti80 titanium alloy, wherein the TC4ELI titanium alloy is widely applied due to high strength advantage, but the fracture toughness, stress corrosion cracking resistance and welding performance of the titanium alloy cannot well meet the requirements under severe application environments, such as under the condition of strong vibration; the Ti80 titanium alloy has excellent comprehensive performance, but the processing performance is poor, and the titanium alloy is easy to crack in the hot processing process. With the urgent need of ocean engineering for titanium alloy plates with high strength and high toughness and ultra-large specifications, development of titanium alloy materials with excellent comprehensive performance, high strength, high toughness, high dynamic tearing energy, easy processing and low cost is urgently needed.
Disclosure of Invention
The invention aims to provide a high-strength high-dynamic tearing-energy titanium alloy and a preparation method and application thereof, and the high-strength high-dynamic tearing-energy titanium alloy provided by the invention has excellent comprehensive performance, the tensile strength is more than 900MPa, and the impact toughness (more than or equal to 50J/cm)2) And the dynamic tearing energy (more than or equal to 350J) is excellent, and the method also has the advantages of easy processing and low cost.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides a high-strength high-dynamic tearing-performance titanium alloy which comprises the following components in percentage by weight: al 4-6%, Nb1.5-2.5%, Zr1.5-2.5%, V1.0-1.5%, Mo0.6-0.9%, Cr0.5-0.8%, Fe0.3-0.4%, and the balance Ti and inevitable impurities.
Preferably, the titanium alloy with high strength and high dynamic tearing energy comprises the following components in percentage by weight: 4.0% of All, 2.0% of Nb2, 2.0% of Zrl, 1.5% of V, 0.7% of Mo0, 0.6% of Cr0.4% of Fe0, and the balance of Ti and inevitable impurities.
Preferably, the titanium alloy with high strength and high dynamic tearing energy comprises the following components in percentage by weight: 4.5% of All, 1.5% of Nb1.5%, 2.5% of Zrl, 1.5% of V, 0.9% of Mo0, 0.8% of Cr0, 0.4% of Fe0, and the balance of Ti and inevitable impurities.
Preferably, the titanium alloy with high strength and high dynamic tearing energy comprises the following components in percentage by weight: 5.0% of All, 2.5% of Nb2, 2.2% of Zrl, 1.0% of V, 0.8% of Mo0, 0.7% of Cr0.3% of Fe0, and the balance of Ti and inevitable impurities.
Preferably, the titanium alloy with high strength and high dynamic tearing energy comprises the following components in percentage by weight: 5.3 percent of All, 1.8 percent of Nb1, 1.8 percent of Zrl, 1.2 percent of V, 0.6 percent of Mo0, 0.5 percent of Cr0, 0.3 percent of Fe0, and the balance of Ti and inevitable impurities.
Preferably, the titanium alloy with high strength and high dynamic tearing energy comprises the following components in percentage by weight: 6.0% of All, 2.3% of Nb1.5% of Zrl, 1.0% of V, 0.6% of Mo0, 0.5% of Cr0.3% of Fe0.3% of Ti and inevitable impurities.
The invention also provides a preparation method of the titanium alloy with high strength and high dynamic tearing energy, which comprises the following steps:
mixing the raw materials of the titanium alloy with high strength and high dynamic tearing energy according to a design proportion, then pressing the mixture into an electrode, and carrying out vacuum consumable arc melting to obtain a titanium alloy ingot;
and forging, rolling and annealing the titanium alloy ingot in sequence to obtain the high-strength high-dynamic tearing-energy titanium alloy.
Preferably, the rolling is carried out for 1 heating time at 40-50 ℃ below the transformation point of the titanium alloy ingot, and the deformation amount of the rolling is more than 75%.
Preferably, the annealing is carried out at the temperature of 750-900 ℃ for 1-2 h; or the annealing is carried out for 1 hour at 800-950 ℃, then air cooling is carried out to room temperature, then the temperature is increased to 450-700 ℃, and the heat preservation is carried out for 2-6 hours.
The invention also provides the application of the high-strength high-dynamic tearing-energy titanium alloy in the technical scheme or the high-strength high-dynamic tearing-energy titanium alloy prepared by the preparation method in the technical scheme as the marine titanium alloy.
The invention provides a high-strength high-dynamic tearing titanium alloy, which comprises the following components, by weight, 4% -6% of Al, 1.5% -2.5% of Nb1.5%, 1.5% -2.5% of ZrC, 1.0% -1.5% of V, 0.6% -0.9% of Mo0.5% -0.8% of Cr0.5% -0.8% of Fe0.3% -0.4%, and the balance of Ti and inevitable impurities2The titanium alloy has excellent processing performance and is not easy to crack, and the excellent performance can be obtained by common heat treatment and double heat treatment.
Drawings
FIG. 1 is a schematic representation of a titanium alloy billet obtained by cogging forging in example 3;
FIG. 2 is a physical diagram of a titanium alloy slab obtained by upsetting-drawing in example 3;
FIG. 3 is a schematic representation of a titanium alloy sheet obtained in example 3;
FIG. 4 is a transverse structural view and a longitudinal structural view of a # 3 titanium alloy obtained in example 3;
FIG. 5 is a transverse structural view and a longitudinal structural view of a 3' # titanium alloy obtained in example 3.
Detailed Description
The invention provides a high-strength high-dynamic tearing-performance titanium alloy which comprises the following components in percentage by weight: al 4-6%, Nb1.5-2.5%, Zr1.5-2.5%, V1.0-1.5%, Mo0.6-0.9%, Cr0.5-0.8%, Fe0.3-0.4%, and the balance Ti and inevitable impurities.
In the invention, the titanium alloy with high strength and high dynamic tearing energy preferably comprises the following components in percentage by weight: 4.0% of All, 2.0% of Nb2, 2.0% of Zrl, 1.5% of V, 0.7% of Mo0, 0.6% of Cr0.4% of Fe0, and the balance of Ti and inevitable impurities.
In the invention, the titanium alloy with high strength and high dynamic tearing energy preferably comprises the following components in percentage by weight: 4.5% of All, 1.5% of Nb1.5%, 2.5% of Zrl, 1.5% of V, 0.9% of Mo0, 0.8% of Cr0, 0.4% of Fe0, and the balance of Ti and inevitable impurities.
In the invention, the titanium alloy with high strength and high dynamic tearing energy preferably comprises the following components in percentage by weight: 5.0% of All, 2.5% of Nb2, 2.2% of Zrl, 1.0% of V, 0.8% of Mo0, 0.7% of Cr0.3% of Fe0, and the balance of Ti and inevitable impurities.
In the invention, the titanium alloy with high strength and high dynamic tearing energy preferably comprises the following components in percentage by weight: 5.3 percent of All, 1.8 percent of Nb1, 1.8 percent of Zrl, 1.2 percent of V, 0.6 percent of Mo0, 0.5 percent of Cr0, 0.3 percent of Fe0, and the balance of Ti and inevitable impurities.
In the invention, the titanium alloy with high strength and high dynamic tearing energy preferably comprises the following components in percentage by weight: 6.0% of All, 2.3% of Nb1.5% of Zrl, 1.0% of V, 0.6% of Mo0, 0.5% of Cr0.3% of Fe0.3% of Ti and inevitable impurities.
The invention also provides a preparation method of the titanium alloy with high strength and high dynamic tearing energy, which comprises the following steps:
mixing the raw materials of the titanium alloy with high strength and high dynamic tearing energy according to a design proportion, then pressing the mixture into an electrode, and carrying out vacuum consumable arc melting to obtain a titanium alloy ingot;
and forging, rolling and annealing the titanium alloy ingot in sequence to obtain the high-strength high-dynamic tearing-energy titanium alloy.
The invention mixes the raw materials of the titanium alloy with high strength and high dynamic tearing energy according to the design proportion, then presses the mixture into the electrode, and carries out vacuum consumable arc melting to obtain the titanium alloy ingot.
The invention has no special limitation on the specific types of the raw materials of the titanium alloy with high strength and high dynamic tearing energy, and can obtain the required proportion. In the embodiment of the invention, the raw materials of the titanium alloy with high strength and high dynamic tearing energy are preferably titanium sponge, aluminum beans, zirconium sponge, aluminum molybdenum alloy, aluminum vanadium alloy, aluminum niobium alloy, low-carbon ferrochrome and ferromolybdenum alloy; the aluminum-molybdenum alloy is preferably AlMo60, the aluminum-vanadium alloy is preferably AlV55, the aluminum-niobium alloy is preferably AlNb60, the low-carbon ferrochrome is preferably FeCr55C0.06, and the ferromolybdenum alloy is preferably FeMo 60; the raw material of the titanium alloy with high strength and high dynamic tearing energy is preferably a granular raw material, the particle size of the raw material is not particularly limited, and a person skilled in the art can select a proper particle size according to the situation and can press an electrode, and in the embodiment of the invention, the particle size of the sponge zirconium is preferably 0.8-12.7 mm; the particle size of the titanium sponge is preferably 0.83-25.4 mm, the particle size of the aluminum beans is preferably 8-13 mm, the particle size of the aluminum-molybdenum alloy is preferably 0.1-0.8 mm, the particle size of the aluminum-vanadium alloy is preferably 1-6 mm, the particle size of the aluminum-niobium alloy is preferably 0.3-6 mm, the particle size of the low-carbon ferrochrome is preferably 60 meshes, and the particle size of the ferromolybdenum is preferably 1-5 mm.
The invention has no special limitation on the concrete parameters of the pressing, and can obtain the electrode which is suitable for the vacuum consumable electrode arc furnace.
In the present invention, the absolute pressure of the vacuum consumable arc melting is preferably 10-2Pa, the smelting current is preferably 8-36 kA, the smelting voltage is preferably 28-40V, and the number of times of vacuum consumable arc smelting is preferably 3. In the invention, the multiple vacuum consumable arc melting is beneficial to ensuring that all components are distributed more uniformly.
After the titanium alloy ingot is obtained, the titanium alloy ingot is forged, rolled and annealed in sequence to obtain the high-strength high-dynamic tearing-energy titanium alloy.
In the invention, the high-strength high-dynamic tearing-energy titanium alloy is preferably a plate.
In the invention, the forging is preferably performed by cogging and forging the titanium alloy ingot at 1050-1180 ℃, and then upsetting and drawing the titanium alloy ingot at 40-50 ℃ below the transformation point of the titanium alloy ingot to form a titanium alloy slab. The thickness of the titanium alloy slab is not particularly limited, and can be selected by a person skilled in the art according to needs, and the thickness of the titanium alloy slab in the embodiment of the invention is preferably 100-240 mm.
In the present invention, the rolling is preferably performed 1-pass rolling at 40 to 50 ℃ below the transformation point of the titanium alloy ingot. In the present invention, the rolling deformation is preferably greater than 75%; after the rolling is completed, the steel sheet is preferably air-cooled to room temperature and then annealed.
In the invention, the annealing is preferably carried out at the temperature of 750-900 ℃ for 1-2 h.
In the invention, the annealing is preferably carried out for 1h at 800-950 ℃, then air cooling is carried out to room temperature, the temperature is raised to 450-700 ℃ again, and the heat preservation is carried out for 2-6 h.
In the present invention, after the annealing is completed, it is preferably air-cooled to room temperature.
The invention also provides the application of the high-strength high-dynamic tearing-energy titanium alloy in the technical scheme or the high-strength high-dynamic tearing-energy titanium alloy prepared by the preparation method in the technical scheme as the marine titanium alloy.
The following will describe in detail a high-strength high-dynamic tear-performance titanium alloy provided by the present invention, and its preparation method and application in conjunction with the following examples, but they should not be construed as limiting the scope of the present invention.
Example 1
(1) The titanium alloy prepared in this example had nominal composition of Ti-4.0Al-2.0Nb-2.0Zr-1.5V-0.7Mo-0.6Cr-0.4Fe, i.e. in weight percent, Al 4.0%, Nb2.0%, Zr2.0%, V1.5%, Mo0.7%, Cr0.6%, Fe0.4%, the balance Ti and unavoidable impurities;
the raw materials used are: grade 1 zirconium sponge: the particle size is 0.8-12.7 mm; grade 1 titanium sponge: the particle size is 0.83-25.4 mm; aluminum bean: the particle size is 8-13 mm; aluminum molybdenum alloy: AlMo60 with the grain diameter of 0.1-0.8 mm; aluminum vanadium alloy: AlV55 with the particle size of 1-6 mm; aluminum-niobium alloy: AlNb60 with the grain diameter of 0.3-6 mm; low-carbon ferrochrome: 60-mesh FeCr55C0.06; ferro-molybdenum alloy: FeMo60 with the particle size of 1-5 mm;
(2) mixing aluminum-molybdenum alloy, aluminum-vanadium alloy, aluminum-niobium alloy, low-carbon ferrochrome, ferromolybdenum alloy, aluminum beans, grade 1 sponge zirconium and grade 1 sponge titanium according to the above-mentioned proportion, pressing them into electrode, then making three-time smelting in vacuum consumable arc furnace to obtain titanium alloy ingot with phi 560mm, in which the absolute pressure vacuum degree of smelting is 10-2Pa, the voltage for the first smelting is 28V, and the current is 8 kA; the voltage of the second smelting is 30V, and the current is 12 kA; the voltage of the third smelting is 32V, and the current is 20 kA;
(3) the titanium alloy ingot is blanked and forged at 1050 ℃, then is upset and drawn at 40 ℃ (namely 880 ℃) below the phase transformation point to form a titanium alloy plate blank with the thickness of 100mm, and then is rolled at 880 ℃ with one fire to form a titanium alloy plate with the thickness of 25 mm;
(4) and (3) keeping the temperature of the titanium alloy plate at 750 ℃ for 1h, carrying out common annealing, and then carrying out air cooling to room temperature to obtain the high-strength high-dynamic tearing energy titanium alloy which is marked as the No. 1 titanium alloy.
Preparing a titanium alloy plate according to the steps (1) - (3), heating the titanium alloy plate to 850 ℃, preserving heat for 1h, then air-cooling to room temperature, heating to 450 ℃, preserving heat for 6h, and air-cooling to room temperature to obtain the high-strength high-dynamic tearing energy titanium alloy which is marked as 1' # titanium alloy.
The tensile strength at room temperature of the titanium alloy is tested by adopting the method disclosed by GB/T228.1-2010, the V-shaped impact toughness of the titanium alloy is tested by adopting the method disclosed by GB/T229-2007, and the dynamic tearing energy of the titanium alloy is tested by adopting the method disclosed by GB/T5482-2007, and the results are as follows:
the tensile strength of the No. 1 titanium alloy at room temperature can reach 920MPa, and the V-shaped impact toughness is 80J/cm2Dynamic tear energy 600J;
the room temperature tensile strength of the 1' # titanium alloy reaches 980MPa, and the V-shaped impact toughness is 65J/cm2Dynamic tear energy 630J.
Example 2
(1) The titanium alloy prepared in this example had nominal composition of Ti-4.5Al-1.5Nb-2.5Zr-1.5V-0.9Mo-0.8Cr-0.4Fe, i.e. in weight percent, Al 4.5%, Nb1.5%, Zr2.2%, V1.5%, Mo0.9%, Cr0.8%, Fe0.4%, the balance Ti and unavoidable impurities;
(2) adopting the raw materials in the embodiment 1, mixing the aluminum-molybdenum alloy, the aluminum-vanadium alloy, the aluminum-niobium alloy, the low-carbon ferrochrome, the ferromolybdenum alloy, the aluminum beans, the grade-1 sponge zirconium and the grade-1 sponge titanium according to the above related proportion, pressing the mixture into an electrode, and then smelting the electrode for three times in a vacuum consumable arc furnace to obtain a titanium alloy ingot with the diameter of 640mm, wherein the absolute pressure and the vacuum degree of the smelting are 10-2Pa, the voltage for the first smelting is 30V, and the current is 12 kA; the voltage of the second smelting is 32V, and the current is 16 kA; the voltage of the third smelting is 35V, and the current is 25 kA;
(3) the titanium alloy ingot is blanked and forged at the temperature of 1150 ℃, then is upset and drawn at the temperature of 45 ℃ below the phase transition point (namely 890 ℃) to form a titanium alloy plate blank with the thickness of 160mm, and then is rolled into a titanium alloy plate with the thickness of 25mm at 890 ℃ by one fire;
(4) and (3) keeping the titanium alloy plate at 800 ℃ for 1h, carrying out common annealing, and then carrying out air cooling to room temperature to obtain the high-strength high-dynamic tearing energy titanium alloy which is marked as 2# titanium alloy.
Preparing a titanium alloy plate according to the steps (1) to (3), heating the titanium alloy plate to 890 ℃, preserving heat for 1h, then air-cooling to room temperature, heating to 500 ℃, preserving heat for 4h, and air-cooling to room temperature to obtain the high-strength high-dynamic tearing energy titanium alloy which is marked as 2' # titanium alloy.
The titanium alloy was tested for room temperature tensile strength, V-shape impact toughness, and dynamic tear energy using the method of example 1, with the following results:
the room-temperature tensile strength of the 2# titanium alloy can reach 935MPa, and the V-shaped impact toughness can reach 75J/cm2Dynamic tear energy 530J;
the room-temperature tensile strength of the 2' # titanium alloy reaches 980MPa, and the V-shaped impact toughness is 60J/cm2Dynamic tear energy 650J.
Example 3
(1) The titanium alloy prepared in this example had nominal composition of Ti-5.0Al-2.5Nb-2.2Zr-1.0V-0.8Mo-0.7Cr-0.3Fe, i.e. in weight percent, Al 5.0%, Nb2.5%, Zr2.2%, V1.0%, Mo0.8%, Cr0.7%, Fe0.3%, the balance Ti and unavoidable impurities;
(2) adopting the raw materials in the embodiment 1, mixing the aluminum-molybdenum alloy, the aluminum-vanadium alloy, the aluminum-niobium alloy, the low-carbon ferrochrome, the ferromolybdenum alloy, the aluminum beans, the grade-1 sponge zirconium and the grade-1 sponge titanium according to the above related proportion, pressing the mixture into an electrode, and then smelting the electrode for three times in a vacuum consumable arc furnace to obtain a titanium alloy ingot with the diameter of 720mm, wherein the absolute pressure and the vacuum degree of the smelting are 10-2Pa, the voltage for the first smelting is 32V, and the current is 15 kA; the voltage of the second smelting is 35V, and the current is 20 kA; the voltage of the third smelting is 38V, and the current is 28 kA;
(3) the titanium alloy ingot is blanked and forged at the temperature of 1100 ℃, then is upset and drawn at the temperature of 50 ℃ (namely 900 ℃) below the phase transition point to form a titanium alloy plate blank with the thickness of 200mm, and then is rolled into a titanium alloy plate with the thickness of 35mm at the temperature of 900 ℃ by one fire;
(4) and (3) keeping the temperature of the titanium alloy plate at 850 ℃ for 1h, carrying out common annealing, and then carrying out air cooling to room temperature to obtain the high-strength high-dynamic tearing energy titanium alloy, which is marked as 3# titanium alloy.
Preparing a titanium alloy plate according to the steps (1) to (3), heating the titanium alloy plate to 910 ℃, preserving the heat for 1h, then air-cooling to room temperature, heating to 650 ℃, preserving the heat for 2h, and air-cooling to room temperature to obtain the high-strength high-dynamic tearing energy titanium alloy which is marked as 3' # titanium alloy.
The titanium alloy was tested for room temperature tensile strength, V-shape impact toughness, and dynamic tear energy using the method of example 1, with the following results:
the tensile strength of the 3# titanium alloy at room temperature can reach 940MPa, and the V-shaped impact toughness can reach 70J/cm2Dynamic tear energy 480J;
the room-temperature tensile strength of the 3' # titanium alloy reaches 970MPa, and the V-shaped impact toughness is 65J/cm2Dynamic tear energy 350J.
Example 4
(1) The titanium alloy prepared in this example had nominal composition of Ti-5.3Al-1.8Nb-1.8Zr-1.2V-0.6Mo-0.5Cr-0.3Fe, i.e. in weight percent, Al 5.3%, Nb1.8%, Zr1.8%, V1.2%, Mo0.6%, Cr0.5%, Fe0.3%, the balance Ti and unavoidable impurities;
(2) adopting the raw materials in the embodiment 1, mixing the aluminum-molybdenum alloy, the aluminum-vanadium alloy, the aluminum-niobium alloy, the low-carbon ferrochrome, the ferromolybdenum alloy, the aluminum beans, the grade-1 sponge zirconium and the grade-1 sponge titanium according to the above related proportion, pressing the mixture into an electrode, and then smelting the electrode for three times in a vacuum consumable arc furnace to obtain a titanium alloy ingot with phi 820mm, wherein the absolute pressure and vacuum degree of the smelting is 10-2Pa, the voltage for the first smelting is 35V, and the current is 18 kA; the voltage of the second smelting is 38V, and the current is 26 kA; the voltage of the third smelting is 40V, and the current is 36 kA;
(3) the titanium alloy ingot is blanked and forged at the temperature of 1150 ℃, then is upset and drawn at the temperature of 40 ℃ below the phase transition point (namely 920 ℃) to form a titanium alloy plate blank with the thickness of 240mm, and then is rolled at 920 ℃ with one fire to form a titanium alloy plate with the thickness of 45 mm;
(4) and (3) preserving the heat of the titanium alloy plate at 900 ℃ for 2h, carrying out common annealing, and then carrying out air cooling to room temperature to obtain the high-strength high-dynamic tearing energy titanium alloy, which is marked as 4# titanium alloy.
Preparing a titanium alloy plate according to the steps (1) to (3), heating the titanium alloy plate to 950 ℃, preserving heat for 1h, then air-cooling to room temperature, heating to 700 ℃, preserving heat for 2h, and air-cooling to room temperature to obtain the high-strength high-dynamic tearing energy titanium alloy which is marked as 4' # titanium alloy.
The titanium alloy was tested for room temperature tensile strength, V-shape impact toughness, and dynamic tear energy using the method of example 1, with the following results:
the room-temperature tensile strength of the No. 4 titanium alloy can reach 930MPa, and the V-shaped impact toughness can reach 55J/cm2Dynamic tear energy 350J;
the room-temperature tensile strength of the 4 '# titanium alloy reaches 1080MPa, and the V-shaped impact toughness of the 4' # titanium alloy is 50J/cm2Dynamic tear energy 380J.
Example 5
(1) The titanium alloy prepared in this example had nominal composition of Ti-6.0Al-2.3Nb-1.5Zr-1.0V-0.6Mo-0.5Cr-0.3Fe, i.e. in weight percent, Al 6.0%, Nb2.3%, Zr1.5%, V1.0%, Mo0.6%, Cr0.5%, Fe0.3%, the balance Ti and unavoidable impurities;
(2) adopting the raw materials in the embodiment 1, mixing the aluminum-molybdenum alloy, the aluminum-vanadium alloy, the aluminum-niobium alloy, the low-carbon ferrochrome, the ferromolybdenum alloy, the aluminum beans, the grade-1 sponge zirconium and the grade-1 sponge titanium according to the above related proportion, pressing the mixture into an electrode, and then smelting the electrode for three times in a vacuum consumable arc furnace to obtain a titanium alloy ingot with the diameter of 720mm, wherein the absolute pressure and the vacuum degree of the smelting are 10-2Pa, the voltage for the first smelting is 32V, and the current is 15 kA; the voltage of the second smelting is 35V, and the current is 20 kA; the voltage of the third smelting is 38V, and the current is 28 kA;
(3) the titanium alloy ingot is blanked and forged at 1180 ℃, then is upset and drawn at 45 ℃ below the transformation point (namely 930 ℃) to form a titanium alloy plate blank with the thickness of 280mm, and then is rolled into a titanium alloy plate with the thickness of 45mm at 900 ℃ by one fire;
(4) and (3) preserving the heat of the titanium alloy plate at 900 ℃ for 2h, carrying out common annealing, and then carrying out air cooling to room temperature to obtain the high-strength high-dynamic tearing energy titanium alloy, which is marked as 5# titanium alloy.
Preparing a titanium alloy plate according to the steps (1) to (3), heating the titanium alloy plate to 920 ℃, preserving heat for 1h, then air-cooling to room temperature, heating to 700 ℃, preserving heat for 2h, and air-cooling to room temperature to obtain the high-strength high-dynamic tearing energy titanium alloy which is marked as 5' # titanium alloy.
The titanium alloy was tested for room temperature tensile strength, V-shape impact toughness, and dynamic tear energy using the method of example 1, with the following results:
the room-temperature tensile strength of the 5# titanium alloy can reach 980MPa, and the V-shaped impact toughness is 65J/cm2Dynamic tear energy 370J;
the room temperature tensile strength of the 5' # titanium alloy reaches 1060MPa, and the V-shaped impact toughness reaches 55J/cm2Dynamic tear energy 500J.
FIG. 1 is a diagram of a titanium alloy blank obtained by cogging and forging in step (3) of example 3, FIG. 2 is a diagram of a titanium alloy blank obtained by upsetting and forming after cogging, and FIG. 3 is a diagram of a titanium alloy plate obtained by rolling, and it can be seen from FIGS. 1 to 3 that there is substantially no cracking phenomenon in the hot working process.
FIG. 4 is a transverse structural view (a) and a longitudinal structural view (b) of a No. 3 titanium alloy obtained in example 3; FIG. 5 shows the transverse structure diagram (a) and the longitudinal structure diagram (b) of the 3' # titanium alloy obtained in example 3. As can be seen from FIGS. 4-5, the grains of the titanium alloy obtained by the two annealing processes are relatively fine and about 5-8 μm.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. The titanium alloy with high strength and high dynamic tearing energy is characterized by comprising the following components in percentage by weight: al 4-6%, Nb 1.5-2.5%, Zr 1.5-2.5%, V1.0-1.5%, Mo 0.6-0.9%, Cr0.5-0.8%, Fe 0.3-0.4%, and the balance Ti and inevitable impurities.
2. The titanium alloy with high strength and high dynamic tearing energy as claimed in claim 1, which is characterized by comprising the following components in percentage by weight: 4.0% of Al, 2.0% of Nb, 2.0% of Zr, 1.5% of V, 0.7% of Mo, 0.6% of Cr, 0.4% of Fe, and the balance of Ti and inevitable impurities.
3. The titanium alloy with high strength and high dynamic tearing energy as claimed in claim 1, which is characterized by comprising the following components in percentage by weight: 4.5% of Al, 1.5% of Nb, 2.5% of Zr, 1.5% of V, 0.9% of Mo, 0.8% of Cr, 0.4% of Fe, and the balance of Ti and inevitable impurities.
4. The titanium alloy with high strength and high dynamic tearing energy as claimed in claim 1, which is characterized by comprising the following components in percentage by weight: 5.0% of Al, 2.5% of Nb, 2.2% of Zr, 1.0% of V, 0.8% of Mo, 0.7% of Cr, 0.3% of Fe, and the balance of Ti and inevitable impurities.
5. The titanium alloy with high strength and high dynamic tearing energy as claimed in claim 1, which is characterized by comprising the following components in percentage by weight: 5.3% of Al, 1.8% of Nb, 1.8% of Zr, 1.2% of V, 0.6% of Mo, 0.5% of Cr, 0.3% of Fe, and the balance of Ti and inevitable impurities.
6. The titanium alloy with high strength and high dynamic tearing energy as claimed in claim 1, which is characterized by comprising the following components in percentage by weight: 6.0% of Al, 2.3% of Nb, 1.5% of Zr, 1.0% of V, 0.6% of Mo, 0.5% of Cr, 0.3% of Fe, and the balance of Ti and inevitable impurities.
7. The preparation method of the titanium alloy with high strength and high dynamic tearing energy as claimed in any one of claims 1 to 6, characterized by comprising the following steps:
mixing the raw materials of the titanium alloy with high strength and high dynamic tearing energy according to a design proportion, then pressing the mixture into an electrode, and carrying out vacuum consumable arc melting to obtain a titanium alloy ingot;
and forging, rolling and annealing the titanium alloy ingot in sequence to obtain the high-strength high-dynamic tearing-energy titanium alloy.
8. A production method according to claim 7, wherein the rolling is performed 1-time heat rolling at 40 to 50 ℃ below the transformation point of the titanium alloy ingot, and the rolling deformation is greater than 75%.
9. The preparation method according to claim 7, wherein the annealing is performed by keeping the temperature at 750-900 ℃ for 1-2 h; or the annealing is carried out for 1 hour at 800-950 ℃, then air cooling is carried out to room temperature, then the temperature is increased to 450-700 ℃, and the heat preservation is carried out for 2-6 hours.
10. Use of the high-strength high-dynamic tearing-energy titanium alloy according to any one of claims 1 to 6 or the high-strength high-dynamic tearing-energy titanium alloy prepared by the preparation method according to any one of claims 7 to 9 as a marine titanium alloy.
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