CN112795812A - TC4 titanium alloy bar and preparation method thereof - Google Patents
TC4 titanium alloy bar and preparation method thereof Download PDFInfo
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Abstract
A TC4 titanium alloy bar and a preparation method thereof are disclosed, wherein the TC4 titanium alloy bar is prepared by mixing 6.0-6.5% of Al, 3.9-4.4% of V, 0.15-0.30% of Fe, 0.14-0.19% of O and the balance of Ti uniformly according to mass percentage, pressing the mixture of aluminum beans, aluminum-vanadium alloy, ferrotitanium alloy, sponge titanium and titanium dioxide into an electrode, assembling and welding, carrying out vacuum self-consumption smelting for many times, carrying out two-heading and two-drawing forging above a phase transformation point, carrying out one-heading and one-drawing forging below the phase transformation point, and carrying out drawing forging below the phase transformation point. The invention optimizes the smelting process by controlling the component proportion to offset the strength reduction caused by increasing the content of the equiaxial primary alpha phase, thereby achieving the purpose of improving the intrinsic strength of the alloy. The initial alpha phase content of the bar is over 65 percent through cogging forging above the phase change point, intermediate billet forging below the phase change point and temperature control in the finished product forging process, and the forged piece product prepared by the bar has good fatigue property.
Description
Technical Field
The invention belongs to the technical field of titanium alloy material processing, and particularly relates to a TC4 titanium alloy bar and a preparation method thereof.
Background
The titanium alloy has high specific strength, lower density and corrosion resistance, and is widely applied to the fields of aviation, aerospace, oceans, chemical engineering and the like. The TC4 titanium alloy has a nominal composition of Ti-6Al-4V (mass fraction, wt%), and belongs to a typical alpha + beta type two-phase titanium alloy. The alloy has the advantages of good specific strength, good plasticity, good processing performance and the like, can be strengthened by heat treatment, and is the titanium alloy which is most widely applied at present.
The GJB949A provides requirements for TC4 titanium alloy bars for aeroengine compressor blades on room-temperature and high-temperature mechanical properties, microstructures, nondestructive inspection and the like. Practical application to engine blades also places stringent requirements on fatigue performance. Generally, the high cycle fatigue performance of the dual-phase titanium alloy can be obviously improved by increasing the content of the equiaxed primary alpha phase in the microstructure of the dual-phase titanium alloy, but the room-temperature strength and the high-temperature strength of the alloy are reduced, so that the strength of a bar material is unqualified. Therefore, the method of improving the high cycle fatigue property of the steel by improving the primary alpha phase content through the molding process may cause the reduction of the room temperature strength and the high temperature strength property, even the situation of not reaching the standard.
Disclosure of Invention
In order to solve the problems, the invention aims to provide a TC4 titanium alloy bar and a preparation method thereof, which meet the GJB949A standard and have good fatigue performance.
In order to achieve the above object, the invention adopts the following technical scheme:
the TC4 titanium alloy bar is characterized by comprising the following elements in percentage by weight: 6.0-6.5% of Al, 3.9-4.4% of V, 0.15-0.30% of Fe, 0.16-0.21% of O, C not more than 0.05%, N not more than 0.03%, H not more than 0.008%, B not more than 0.0015%, Y not more than 0.001%, and the balance of Ti.
A preparation method of a TC4 titanium alloy bar comprises the following steps:
1) according to the mass percentage, 6.0-6.5% of Al, 3.9-4.4% of V, 0.15-0.30% of Fe, 0.14-0.19% of O and the balance of Ti are uniformly mixed, and then the mixture is pressed into an electrode;
2) assembling and welding the electrode block to obtain a consumable electrode;
3) carrying out vacuum consumable melting on the consumable electrode for multiple times to obtain a TC4 titanium alloy ingot;
4) and (3) carrying out 2-3 times of two-upsetting and two-drawing forging on the cast ingot above the phase transformation point, then carrying out 3-5 times of one-upsetting and one-drawing forging below the phase transformation point, and finally carrying out 2-4 times of drawing forging below the phase transformation point to obtain the TC4 titanium alloy bar.
The invention has the further improvement that the times of vacuum consumable melting are 3 times, the size of a crucible used for one-time melting is phi 280-phi 450mm, the vacuum degree before melting is less than or equal to 0.5Pa, and the air leakage rate is less than or equal to 0.5 Pa/min.
The invention has the further improvement that the primary smelting current is 7-18 kA, the primary smelting voltage is 28-35V, the arc stabilizing current adopts direct current of 7.0-12.0A, and the cooling time after smelting is 2.5-4 h.
The further improvement of the invention is that the size of the crucible used for the secondary smelting is phi 360-phi 630mm, the vacuum degree before smelting is less than or equal to 0.8Pa, and the air leakage rate is less than or equal to 0.8 Pa/min.
The invention has the further improvement that the secondary smelting current is 9-20 kA, the secondary smelting voltage is 30-38V, the arc stabilizing current is 8.0-15.0A, and the cooling time after smelting is 3-6 h.
The further improvement of the invention is that the size of the crucible used in the third smelting is phi 450-phi 720mm, the vacuum degree before smelting is less than or equal to 0.8Pa, and the air leakage rate is less than or equal to 1.0 Pa/min.
The invention has the further improvement that the tertiary smelting current is 10-22 kA, the smelting voltage is 30-40V, the arc stabilizing current is 10.0-18.0A, and the cooling time after smelting is 4-7 h.
The further improvement of the invention is that the specific process of carrying out two-time two-upsetting two-drawing forging on the cast ingot above the phase transformation point by 2-3 times comprises the following steps: preheating a TC4 titanium alloy ingot at 800-850 ℃ for 1h, heating to 20-150 ℃ above the phase transformation point, preserving heat for 1-4 h, and then performing 2-3-time two-upsetting and two-drawing forging.
The further improvement of the invention is that the specific process of performing 3-5 times of fire one-time upsetting one-time drawing forging below the phase change point comprises the following steps: preserving the heat of the forging stock subjected to the two-upsetting and two-drawing forging at the temperature of 30-60 ℃ below the phase transformation point for 3-5 h, and then performing 3-5-time one-upsetting and one-drawing forging;
the specific process of carrying out 2-4 times of hot drawing forging below the phase transition point comprises the following steps: and (3) keeping the temperature of the forging stock subjected to the first upsetting-first drawing forging below the phase transformation point for 1-3 h, and then forging.
Compared with the prior art, the invention has the following beneficial effects:
on one hand, the smelting process is optimized by controlling the component proportion to offset the strength reduction caused by increasing the content of the equiaxial primary alpha phase, so as to achieve the aim of improving the intrinsic strength of the alloy. Compared with GJB494A, the method further reduces the required range of alloy elements, accurately controls Al and V elements within the range of plus or minus 0.25%, controls the content of O element to 0.16-0.21% (wherein the standard requirement of GJB494A is less than or equal to 0.20%) and controls other impurity elements strictly, and the content of Fe impurity element as main element is controlled within the range of 0.15-0.30%. On the other hand, the nascent alpha phase content of the bar is over 65 percent through cogging forging above the phase transformation point, intermediate billet forging below the phase transformation point and temperature control in the finished product forging process, and the forged piece product prepared by the bar has good fatigue performance.
Detailed Description
The present invention is described in further detail below with reference to examples:
the TC4 titanium alloy bar for aviation comprises the following elements in percentage by weight: 6.0-6.5% of Al, 3.9-4.4% of V, 0.15-0.30% of Fe, 0.16-0.21% of O, C not more than 0.05%, N not more than 0.03%, H not more than 0.008%, B not more than 0.0015%, Y not more than 0.001%, and the balance of Ti.
The preparation method of the TC4 titanium alloy bar for aviation specifically comprises the following steps:
step 1: raw material preparation
The raw materials are respectively aluminum bean (Al99.7), aluminum vanadium alloy (AlV55), titanium-iron alloy (TiFe70), titanium sponge and titanium dioxide.
Step 2: pressed electrode block
And (2) mixing the raw materials prepared in the step (1) according to 6.0-6.5% of Al, 3.9-4.4% of V and 0.15-0.30% of Fe, wherein the oxygen is increased by smelting for three times according to 0.02%, and then mixing the O element according to 0.14-0.19%, and pressing the mixture to form the electrode.
And step 3: welding of electrode blocks
And (3) assembling and welding the electrode block pressed in the step (2) by adopting a vacuum plasma welding box to obtain the consumable electrode.
And 4, step 4: vacuum consumable melting
And 3, carrying out vacuum consumable melting on the consumable electrode obtained in the step 3 for 3 times by adopting a vacuum consumable electric arc furnace to obtain a TC4 titanium alloy ingot.
And 5: forging
And (4) carrying out two-time two-upsetting and two-drawing forging on the ingot obtained in the step (4) above the phase transformation point, carrying out 3-5-time one-upsetting and one-drawing forging below the phase transformation point, and finally carrying out 2-4-time drawing forging below the phase transformation point to obtain the TC4 titanium alloy bar.
In the step 4, the size of a crucible used for one-time smelting is phi 280-phi 450mm, the vacuum before smelting is less than or equal to 0.5Pa, the air leakage rate is less than or equal to 0.5Pa/min, the smelting current is 7-18 kA, the smelting voltage is 28-35V, the arc stabilizing current adopts direct current of 7.0-12.0A, and the cooling time after smelting is 2.5-4 h.
In the step 4, the size of a crucible used for secondary smelting is phi 360-phi 630mm, the vacuum before smelting is less than or equal to 0.8Pa, the air leakage rate is less than or equal to 0.8Pa/min, the smelting current is 9-20 kA, the smelting voltage is 30-38V, the arc stabilizing current is 8.0-15.0A, and the cooling time after smelting is 3-6 h.
In the step 4, the size of a crucible used in the third smelting is phi 450-phi 720mm, the vacuum before smelting is less than or equal to 0.8Pa, the air leakage rate is less than or equal to 1.0Pa/min, the smelting current is 10-22 kA, the smelting voltage is 30-40V, the arc stabilizing current is 10.0-18.0A, and the cooling time after smelting is 4-7 h.
In the step 5, 2-3 times of fire forging is carried out above the phase transformation point, specifically, the ingot is preheated for 1 hour at 800-850 ℃, heated to 20-150 ℃ above the phase transformation point and subjected to two-upsetting and two-drawing forging after heat preservation for 1-4 hours, so that the purpose of crushing original grains is achieved.
And 5, performing primary upsetting-drawing forging at the temperature below the phase transformation point by 3-5 times, specifically, charging the forging stock subjected to two upsetting and two drawing processes into a furnace, heating to the temperature below the phase transformation point by 30-60 ℃, preserving the heat for 3-5 hours, and performing primary upsetting-drawing forging to further refine the structure.
And 5, performing 2-4 times of hot drawing forging below the transformation point, specifically, charging the forging blank subjected to first heading and first drawing into a furnace, heating to 50-70 ℃ below the transformation point, preserving heat for 1-3 hours, and then forging to obtain the bar material with the required specification.
The following are specific examples.
Example 1
Preparing a phi 150mmTC4 titanium alloy bar by using a 1T cast ingot:
1) raw material preparation
The raw materials are respectively aluminum bean (Al99.7), aluminum vanadium alloy (AlV55), titanium-iron alloy (TiFe70), titanium sponge and titanium dioxide.
2) Pressed electrode block
The prepared raw materials are mixed according to 6.0% of Al, 3.9% of V, 0.15% of Fe and 0.14% of O, the mixture is uniformly mixed and pressed into an electrode, and the total weight of the electrode block is 1T.
3) Welding of electrode blocks
And assembling and welding the pressed electrode block by adopting a vacuum plasma welding box to obtain the consumable electrode.
4) Vacuum consumable melting
Carrying out three times of vacuum consumable melting on the consumable electrode, wherein the size of a crucible used in one time of melting is phi 280mm, the vacuum before melting is less than or equal to 0.5Pa, the gas leakage rate is less than or equal to 0.5Pa/min, the melting current is 7kA, the melting voltage is 28-35V, the arc stabilizing current adopts direct current 7.0A, and the cooling time after melting is 2.5 h.
The size of a crucible used for secondary smelting is phi 360mm, the vacuum before smelting is less than or equal to 0.8Pa, the gas leakage rate is less than or equal to 0.8Pa/min, the smelting current is 9kA, the smelting voltage is 30-38V, the arc stabilizing current is 8.0A, and the cooling time after smelting is 3 h.
The size of a crucible used in the third smelting is phi 450mm, the vacuum before smelting is less than or equal to 0.8Pa, the gas leakage rate is less than or equal to 1.0Pa/min, the smelting current is 10kA, the smelting voltage is 30-40V, the arc stabilizing current is 10.0A, and the cooling time after smelting is 4 hours. And obtaining an ingot with phi 450mm after the smelting is finished. And detecting chemical components and phase change points of the cast ingot, cutting off a dead head of the cast ingot, and polishing the surface. The components of the cast ingot are detected to be qualified, the cast ingot is forged after the surface processing is finished, and the phase change point is 990-995 DEG C
5) Forging
Preheating the cast ingot at 800-850 ℃ for 1h, heating to 1010-1145 ℃, preserving heat for 1-2 h, then forging for 2 times, and performing two-upsetting and two-drawing on each time to achieve the purpose of crushing original grains. And then heating to 930-965 ℃, preserving heat for 3-3.5 hours, forging for 3 times, upsetting and drawing each time, and further refining the structure. And finally, heating to 920-945 ℃, preserving the heat for 1.0-1.5 h, carrying out drawing and forging for 2 times, and carrying out one-time upsetting and one-time drawing on each time to obtain the TC4 titanium alloy bar with the required phi of 150 mm.
The room-temperature and high-temperature mechanical properties and the content of the primary alpha phase in the structure of the bar are tested, the requirement of GJB494A is met, meanwhile, the fatigue property of a forge piece prepared by the bar is tested to be good, and specific detection results are shown in the following table.
TABLE 1-1 Phi 150mmTC4 titanium alloy bar material room temperature and high temperature mechanical property
TABLE 1-2 phi 150mmTC4 titanium alloy bar primary alpha phase content and fatigue performance results of the prepared forgings
Example 2
Preparing a phi 140mmTC4 titanium alloy bar by using a 2T cast ingot:
1) raw material preparation
The raw materials are respectively aluminum bean (Al99.7), aluminum vanadium alloy (AlV55), titanium-iron alloy (TiFe70), titanium sponge and titanium dioxide.
2) Pressed electrode block
The prepared raw materials are mixed according to 6.5% of Al, 4.4% of V, 0.30% of Fe and 0.19% of O, the mixture is uniformly mixed and pressed into an electrode, and the total weight of the electrode block is 2T.
3) Welding of electrode blocks
And assembling and welding the pressed electrode block by adopting a vacuum plasma welding box to obtain the consumable electrode.
4) Vacuum consumable melting
Carrying out three times of vacuum consumable melting on the consumable electrode, wherein the size of a crucible used in one time of melting is phi 360mm, the vacuum before melting is less than or equal to 0.5Pa, the gas leakage rate is less than or equal to 0.5Pa/min, the melting current is 9kA, the melting voltage is 28-35V, the arc stabilizing current adopts direct current of 8.0A, and the cooling time is 3 hours after melting.
The size of a crucible used for secondary smelting is phi 450mm, the vacuum before smelting is less than or equal to 0.8Pa, the gas leakage rate is less than or equal to 0.8Pa/min, the smelting current is 14kA, the smelting voltage is 30-38V, the arc stabilizing current is alternating current 12A, and the cooling time after smelting is 4 hours.
The size of a crucible used in the third smelting is phi 520mm, the vacuum before smelting is less than or equal to 0.8Pa, the gas leakage rate is less than or equal to 1.0Pa/min, the smelting current is 18kA, the smelting voltage is 30-40V, the arc stabilizing current is alternating current 14.0A, and the cooling time after smelting is 5 h. And obtaining an ingot with phi of 520mm after the smelting is finished. And detecting chemical components and phase change points of the cast ingot, cutting off a dead head of the cast ingot, and polishing the surface. The components of the cast ingot are detected to be qualified, the cast ingot is forged after the surface processing is finished, and the phase change point is 1000-1005 DEG C
5) Forging
Preheating the cast ingot at 800-850 ℃ for 1h, heating to 1020-1150 ℃, preserving heat for 1-2 h, then forging for 2 times, and performing two-upsetting and two-drawing on each time to achieve the purpose of crushing original grains. And then heating to 940-975 ℃, preserving heat for 3-4 h, forging for 4 times, upsetting and drawing each time, and further refining the structure. And finally, heating to 930-955 ℃, preserving the heat for 1.5-2 h, drawing and forging for 2 times of fire, and upsetting and drawing each time of fire to obtain the TC4 titanium alloy bar with the required phi 140 mm.
The room-temperature and high-temperature mechanical properties and the content of the primary alpha phase in the structure of the bar are tested, the requirement of GJB494A is met, meanwhile, the fatigue property of a forge piece prepared by the bar is tested to be good, and specific detection results are shown in the following table.
TABLE 2-1 phi 140mmTC4 titanium alloy bar material room temperature and high temperature mechanical property
TABLE 2-2 phi 140mmTC4 titanium alloy bar primary alpha phase content and fatigue performance results of the prepared forgings
Example 3
Preparing a phi 110mmTC4 titanium alloy bar by using a 3T cast ingot:
1) raw material preparation
The raw materials are respectively aluminum bean (Al99.7), aluminum vanadium alloy (AlV55), titanium-iron alloy (TiFe70), titanium sponge and titanium dioxide.
2) Pressed electrode block
The prepared raw materials are mixed according to 6.2% of Al, 4.0% of V, 0.18% of Fe and 0.16% of O, the mixture is uniformly mixed and pressed into an electrode, and the total weight of the electrode block is 3T.
3) Welding of electrode blocks
And assembling and welding the pressed electrode block by adopting a vacuum plasma welding box to obtain the consumable electrode.
4) Vacuum consumable melting
Carrying out three times of vacuum consumable melting on the consumable electrode, wherein the size of a crucible used in one time of melting is phi 450mm, the vacuum before melting is less than or equal to 0.5Pa, the gas leakage rate is less than or equal to 0.5Pa/min, the melting current is 14kA, the melting voltage is 28-35V, the arc stabilizing current adopts direct current of 12.0A, and the cooling time is 4 hours after melting.
The size of a crucible used for secondary smelting is phi 520mm, the vacuum before smelting is less than or equal to 0.8Pa, the gas leakage rate is less than or equal to 0.8Pa/min, the smelting current is 18kA, the smelting voltage is 30-38V, the arc stabilizing current is alternating current 14A, and the cooling time after smelting is 5 h.
The size of a crucible used in the third smelting is phi 630mm, the vacuum before smelting is less than or equal to 0.8Pa, the gas leakage rate is less than or equal to 1.0Pa/min, the smelting current is 20kA, the smelting voltage is 30-40V, the arc stabilizing current is alternating current 15.0A, and the cooling time after smelting is 6 h. And obtaining an ingot with phi of 520mm after the smelting is finished. And detecting chemical components and phase change points of the cast ingot, cutting off a dead head of the cast ingot, and polishing the surface. The components of the cast ingot are detected to be qualified, the cast ingot is forged after the surface processing is finished, and the phase change point is 995-1000 DEG C
5) Forging
Preheating the cast ingot at 800-850 ℃ for 1h, heating to 1015-1150 ℃, preserving heat for 2-3 h, then forging for 3 times, and performing two-upsetting and two-drawing for each time to achieve the purpose of crushing original grains. And then heating to 935-970 ℃, preserving the temperature for 3.5-4 h, and then forging for 4 times, wherein upsetting and drawing are carried out once for each time, and the structure is further refined. And finally, heating to 925-950 ℃, preserving the heat for 2.0-2.5 h, drawing and forging for 3 times, and upsetting and drawing each time to obtain the required phi 110mm TC4 titanium alloy bar.
The room-temperature and high-temperature mechanical properties and the content of the primary alpha phase in the structure of the bar are tested, the requirement of GJB494A is met, meanwhile, the fatigue property of a forge piece prepared by the bar is tested to be good, and specific detection results are shown in the following table.
TABLE 3-1 phi 110mmTC4 titanium alloy bar material room temperature and high temperature mechanical property
TABLE 3-2 phi 110mmTC4 titanium alloy bar primary alpha phase content and fatigue performance results of the prepared forgings
Example 4
Preparing a phi 80mmTC4 titanium alloy bar by using a 4T ingot:
1) raw material preparation
The raw materials are respectively aluminum bean (Al99.7), aluminum vanadium alloy (AlV55), titanium-iron alloy (TiFe70), titanium sponge and titanium dioxide.
2) Pressed electrode block
The prepared raw materials are mixed according to 6.3 percent of Al, 4.1 percent of V, 0.20 percent of Fe and 0.18 percent of O, the mixture is uniformly mixed and pressed into an electrode, and the total weight of the electrode block is 3T.
3) Welding of electrode blocks
And assembling and welding the pressed electrode block by adopting a vacuum plasma welding box to obtain the consumable electrode.
4) Vacuum consumable melting
And carrying out three times of vacuum consumable melting on the consumable electrode, wherein the size of a crucible used in one time of melting is phi 520mm, the vacuum before melting is less than or equal to 0.5Pa, the gas leakage rate is less than or equal to 0.5Pa/min, the melting current is 18kA, the melting voltage is 28-35V, the arc stabilizing current adopts direct current of 14.0A, and the cooling time is 5 hours after melting.
The size of a crucible used for secondary smelting is phi 630mm, the vacuum before smelting is less than or equal to 0.8Pa, the gas leakage rate is less than or equal to 0.8Pa/min, the smelting current is 20kA, the smelting voltage is 30-38V, the arc stabilizing current is alternating current 15A, and the cooling time after smelting is 6 h.
The size of a crucible used in the third smelting is phi 720mm, the vacuum before smelting is less than or equal to 0.8Pa, the gas leakage rate is less than or equal to 1.0Pa/min, the smelting current is 22kA, the smelting voltage is 30-40V, the arc stabilizing current is 18.0A, and the cooling time after smelting is 7 h. And obtaining an ingot with phi of 520mm after the smelting is finished. And detecting chemical components and phase change points of the cast ingot, cutting off a dead head of the cast ingot, and polishing the surface. The components of the cast ingot are detected to be qualified, the cast ingot is forged after the surface processing is finished, and the phase change point is 1005-1010 DEG C
5) Forging
Preheating the cast ingot at 800-850 ℃ for 1h, heating to 1025-1160 ℃, preserving heat for 3-4 h, then forging for 3 times, and performing two-upsetting and two-drawing on each time to achieve the purpose of crushing original grains. And then heating to 945-980 ℃, preserving heat for 4-5 hours, and then forging for 5 times of fire, wherein one upsetting and one drawing are carried out each time of fire, and the structure is further refined. And finally, heating to 935-960 ℃, preserving the temperature for 2-3 h, drawing and forging for 4 times of fire, and upsetting and drawing each time of fire to obtain the required phi 80mm TC4 titanium alloy bar.
TABLE 4-1 phi 80mmTC4 titanium alloy bar material room temperature and high temperature mechanical property
TABLE 4-2 phi 80mmTC4 titanium alloy bar primary alpha phase content and fatigue performance results of the prepared forgings
Claims (10)
1. The TC4 titanium alloy bar is characterized by comprising the following elements in percentage by weight: 6.0-6.5% of Al, 3.9-4.4% of V, 0.15-0.30% of Fe, 0.16-0.21% of O, C not more than 0.05%, N not more than 0.03%, H not more than 0.008%, B not more than 0.0015%, Y not more than 0.001%, and the balance of Ti.
2. The preparation method of the TC4 titanium alloy bar is characterized by comprising the following steps:
1) according to the mass percentage, 6.0-6.5% of Al, 3.9-4.4% of V, 0.15-0.30% of Fe, 0.14-0.19% of O and the balance of Ti are uniformly mixed, and then the mixture is pressed into an electrode;
2) assembling and welding the electrode block to obtain a consumable electrode;
3) carrying out vacuum consumable melting on the consumable electrode for multiple times to obtain a TC4 titanium alloy ingot;
4) and (3) carrying out 2-3 times of two-upsetting and two-drawing forging on the cast ingot above the phase transformation point, then carrying out 3-5 times of one-upsetting and one-drawing forging below the phase transformation point, and finally carrying out 2-4 times of drawing forging below the phase transformation point to obtain the TC4 titanium alloy bar.
3. The method for preparing the TC4 titanium alloy bar according to claim 2, wherein the number of times of vacuum consumable melting is 3, the size of a crucible used for one-time melting is phi 280-phi 450mm, the vacuum degree before melting is less than or equal to 0.5Pa, and the air leakage rate is less than or equal to 0.5 Pa/min.
4. The preparation method of the TC4 titanium alloy bar according to claim 2, wherein a primary smelting current is 7-18 kA, a primary smelting voltage is 28-35V, an arc stabilizing current is direct current 7.0-12.0A, and a cooling time after smelting is 2.5-4 h.
5. The method for preparing the TC4 titanium alloy bar as recited in claim 2, wherein the size of the crucible used for the secondary smelting is phi 360-phi 630mm, the vacuum degree before smelting is less than or equal to 0.8Pa, and the air leakage rate is less than or equal to 0.8 Pa/min.
6. The preparation method of the TC4 titanium alloy bar according to claim 2, wherein the secondary smelting current is 9-20 kA, the secondary smelting voltage is 30-38V, the arc stabilizing current is 8.0-15.0A, and the cooling time after smelting is 3-6 h.
7. The method for preparing the TC4 titanium alloy bar as recited in claim 2, wherein the size of a crucible used in the third smelting is phi 450-phi 720mm, the vacuum degree before smelting is less than or equal to 0.8Pa, and the air leakage rate is less than or equal to 1.0 Pa/min.
8. The preparation method of the TC4 titanium alloy bar according to claim 2, wherein the tertiary smelting current is 10-22 kA, the smelting voltage is 30-40V, the arc stabilizing current is AC 10.0-18.0A, and the cooling time after smelting is 4-7 h.
9. The preparation method of the TC4 titanium alloy bar as claimed in claim 2, wherein the specific process of performing 2-3 times of two-upsetting two-drawing forging on the ingot above the transformation point comprises the following steps: preheating a TC4 titanium alloy ingot at 800-850 ℃ for 1h, heating to 20-150 ℃ above the phase transformation point, preserving heat for 1-4 h, and then performing 2-3-time two-upsetting and two-drawing forging.
10. The method for preparing the TC4 titanium alloy bar according to claim 2, wherein the specific process of performing 3-5 fire one-time upsetting one-pull forging below the transformation point comprises the following steps: preserving the heat of the forging stock subjected to the two-upsetting and two-drawing forging at the temperature of 30-60 ℃ below the phase transformation point for 3-5 h, and then performing 3-5-time one-upsetting and one-drawing forging;
the specific process of carrying out 2-4 times of hot drawing forging below the phase transition point comprises the following steps: and (3) keeping the temperature of the forging stock subjected to the first upsetting-first drawing forging below the phase transformation point for 1-3 h, and then forging.
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