CN109500331B - TC25 titanium alloy large-size bar processing method - Google Patents
TC25 titanium alloy large-size bar processing method Download PDFInfo
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- CN109500331B CN109500331B CN201811303267.2A CN201811303267A CN109500331B CN 109500331 B CN109500331 B CN 109500331B CN 201811303267 A CN201811303267 A CN 201811303267A CN 109500331 B CN109500331 B CN 109500331B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
- B21J5/002—Hybrid process, e.g. forging following casting
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J1/00—Preparing metal stock or similar ancillary operations prior, during or post forging, e.g. heating or cooling
- B21J1/06—Heating or cooling methods or arrangements specially adapted for performing forging or pressing operations
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
- B21J5/06—Methods for forging, hammering, or pressing; Special equipment or accessories therefor for performing particular operations
Abstract
The invention discloses a processing method of a TC25 titanium alloy large-size bar, which is realized by raw material selection → ingot casting preparation → cogging forging → forging above the β transition temperature → recrystallization homogenization heat treatment forging → forging below the β transition temperature → finished product forging.
Description
Technical Field
The invention provides a method for processing a TC25 titanium alloy large-size bar, belonging to the technical field of titanium alloy material smelting and free forging.
Background
The TC25 titanium alloy is formed by evolution of Russian BT25 titanium alloy, the nominal component of the alloy is Ti-6.5Al-2Mo-1Zr-1Sn-1W-0.2Si, the titanium alloy is α + β two-phase titanium alloy, the alloy phase change point is 1000-1040 ℃, the alloy has excellent comprehensive performance and good high-temperature mechanical property and thermal stability, the supply time is 6000 hours below 500 ℃, the working time is 3000 hours at 550 ℃, and the service temperature is far higher than the service temperature of Ti-6 Al-4V.
Aiming at the application requirements of the aviation industry on TC25 titanium alloy large-specification bars, the method develops the technical research on the bar processing with the main specification of phi 250-phi 400mm, realizes the large-scale production of TC25 titanium alloy large-specification bars, and meets the requirements of the development of the aviation industry in China.
Disclosure of Invention
Aiming at the problems that the method for producing the TC25 large-specification bar in a large scale does not exist in the prior art, and the TC25 titanium alloy contains 1% of tungsten (W), the tungsten is a high-melting-point high-density metal and is easy to form high-density impurities in the alloy, the invention aims to provide the method for processing the TC25 large-specification bar with the diameter of phi 250-phi 400mm, the bar is a α + β two-phase structure, and the bar is good in chemical composition and structure uniformity, high in mechanical property and very stable, and suitable for industrial production.
In order to achieve the purpose, the invention adopts the technical scheme that: the processing method of the TC25 titanium alloy large-size bar is characterized by being realized through raw material selection → ingot casting preparation → free forging of the large-size bar.
The preparation method of the TC25 titanium alloy large-size bar specifically comprises the following steps:
step 1: selection of raw materials
Selecting sponge titanium with the particle size of 0.83-12.7 mm, AlMoWTi alloy, Al-Mo alloy, Al, HZr, Ti-Sn alloy, Al-Si alloy and TiO2The intermediate alloys are used as raw materials, wherein the content of W in the AlMoWTi alloy is 17-20%, and the granularity is 0.25-3 mm;
step 2: preparation of ingot
Raw material mixing is carried out according to the content of each element of chemical components required by the GB/T3620.1 standard, three times of vacuum consumable electro-arc furnace smelting is adopted according to the vacuum consumable electro-melting method, the pressure of the last smelting stabilization stage is not more than 5Pa, and a TC25 titanium alloy ingot with uniform components is obtained;
and step 3: cogging forging
At the cogging forging temperature of 80-150 ℃ above the transformation temperature of β, firstly, upsetting and drawing a TC25 titanium alloy ingot for 1 fire, controlling the forging ratio to be 2.5-3.5, and cooling in air after forging;
then, upsetting and forging the blank for 1 heating time at the temperature 50-70 ℃ above the cogging forging temperature, controlling the forging ratio to be 2.5-3.5, and cooling the blank in air after forging;
step 4, forging above the transformation temperature of β
Heating to 50-100 ℃ above the β transformation temperature, carrying out upsetting-drawing forging on the blank processed in the step 3 for 1-2 times, controlling the forging ratio of each time to be 2.5-3.5, and cooling in air after forging;
and 5: recrystallization homogenization heat treatment forging
Heating to 30-50 ℃ below the β transformation temperature, upsetting-drawing forging for 1 heating time is carried out on the blank processed in the step 4, the forging ratio is controlled to be 1.4-1.8, the forged hot material is returned to the furnace for heat treatment, the heating temperature of the heat treatment is 50-100 ℃ above the β transformation temperature, the blank is taken out of the furnace for one-upsetting-one-drawing forging, the forging ratio is controlled to be 1.1-1.4, and air cooling is carried out after forging;
step 6 forging below β transformation temperature
And (3) heating to 20-40 ℃ below the β transformation temperature, upsetting and drawing the blank processed in the step (5) for 2-3 times, controlling the forging ratio to be 1.4-1.8 every time, and cooling in air after forging.
And 7: forging of finished product
And (4) carrying out 2-4 times of hot drawing forging on the forging stock obtained in the step (6) at the temperature of 30-50 ℃ below the phase transition point, controlling the forging ratio of each time to be 1.2-2.8, and carrying out air cooling after the drawing forging.
The heating time of the recrystallization homogenization heat treatment in the step 5 is 200-300 min.
Further, upsetting forging in the step 3 and the step 4 is two-upsetting two-drawing; and 5, upsetting forging in the step 6 is upsetting-drawing.
Compared with the prior art, the invention has the following beneficial effects:
1. according to the invention, the AlMoWTi quaternary intermediate alloy with a proper granularity is selected for adding the W element, so that the risk of high-density inclusion segregation caused by the high-melting-point refractory metal W is reduced to the greatest extent, and the chemical components of the ingot are uniform and stable.
2. In the free forging, the heating temperature of the second fire is higher than that of the first fire in the ingot cogging forging stage, so that the cast structure can be effectively crushed, crystal grains can be refined, and the uniformity of the structure can be improved.
3. By adopting a recrystallization homogenization heat treatment forging mode, namely directly carrying out recrystallization homogenization heat treatment above a β transformation point on the basis of finishing forging deformation below a β transformation point and carrying out forging with small deformation above a β transformation point, the grain structure can be greatly refined, the problem of large blank deformation nonuniformity can be improved, and the subsequent processing fire number of two-phase regions can be effectively reduced.
Drawings
FIG. 1 is a macroscopic structural diagram of a bar material with a diameter of 300mm prepared by the first embodiment of the present invention
FIG. 2 is a microstructure of a bar of 300mm diameter prepared according to the first embodiment of the present invention (the left side is the head, the right side is the core)
FIG. 3 is a macroscopic structural diagram of a 400mm diameter bar prepared by the second embodiment of the present invention
FIG. 4 is a microstructure of a 400mm diameter bar prepared according to example two of the present invention (the left side is the head, and the right side is the core).
Detailed description of the invention
The invention will now be further elucidated with reference to specific embodiments.
The first embodiment is as follows:
step 1, raw material selection: selecting sponge titanium with the granularity of 0.83-12.7 mm, AlMoWTi alloy (the W content is 17-20%, the granularity is 0.25-3 mm), Al-60Mo alloy, Al bean, HZr, Ti-80Sn alloy, Al-10Si alloy, TiO alloy2These master alloys are used as raw materials;
step 2, preparing ingots, namely, mixing raw materials according to the element ratio of TC25 in GB/T3620.1, preparing consumable electrodes, carrying out three times of vacuum consumable melting by adopting a vacuum consumable melting method, wherein the pressure of the last melting stabilization stage is not more than 5Pa to obtain TC25 titanium alloy ingots with phi of 680mm, and measuring the β transition temperature of the ingots to be 1000 ℃;
and step 3: cogging forging
Under the cogging forging temperature of 1080 ℃, firstly, upsetting-drawing forging is carried out on a TC25 titanium alloy ingot for 1 time, namely the heating temperature of 1-time forging is 1080 ℃, two-upsetting-two-drawing forging is carried out to □ 600mm, the forging ratio is 3.0, and air cooling is carried out after forging;
then, upsetting and drawing forging are carried out on the blank for 1 time at the temperature 70 ℃ above the cogging forging temperature, namely, 1150 ℃ is selected as the heating temperature of 2-time forging, two-upsetting and two-drawing forging are carried out until the forging ratio is □ 600.3, and air cooling is carried out after forging;
step 4, forging above the transformation temperature of β
Heating to 80 ℃ above the β transformation temperature, carrying out upsetting-drawing forging on the blank processed in the step 3 for 1 time, namely selecting 1080 ℃ as the heating temperature of 3-time forging, carrying out two-upsetting-two-drawing forging to □ 600mm, wherein the forging ratio is 3.2, and carrying out air cooling after forging;
and 5: recrystallization homogenization heat treatment forging
Heating temperature is 40 ℃ below β transformation temperature, upsetting-drawing forging is carried out on the blank processed in the step 4 for 1 time, namely the heating temperature of 4-time forging is 960 ℃, first upsetting-drawing forging is carried out to □ 600mm, the forging ratio is 1.6, the hot material after forging is returned to a furnace for heat treatment, the heating temperature of heat treatment is 1080 ℃, the heat treatment time is 240 minutes, the blank is taken out of the furnace for 1 time upsetting-drawing forging, namely the first upsetting-drawing forging is carried out to □ 600mm, the forging ratio is controlled to be 1.1, and air cooling is carried out after forging;
step 6 forging below β transformation temperature
Heating to 30 ℃ below the β transformation temperature, carrying out upsetting-drawing forging on the blank processed in the step 5 for 2 times, namely selecting 970 ℃ as the heating temperature of 5-6 times of hot forging, wherein each time of hot forging is upsetting-drawing forging to □ 600mm, the forging ratio of each time is 1.6, and air cooling is adopted after forging;
and 7: forging of finished product
And (4) carrying out hot drawing forging on the forging stock obtained in the step (6) at 40 ℃ below the phase transition point, namely selecting 960 ℃ as the heating temperature for 7-10 hot forging, carrying out drawing and rounding, wherein the hot forging ratio is 1.7 per time, and finally obtaining the finished product with the specification of phi 300 mm.
FIG. 1 is a macroscopic structure diagram of a bar material with the specification of phi 300mm and prepared by forging through the process, and it can be seen that the macroscopic structure diagram has no obvious metallurgical defects and is uniform in structure. Fig. 2 shows the microstructures of the edge and the core of the respective bars, and it can be seen that the microstructures of the edge and the core are very uniform.
Example two:
step 1, raw material selection: selecting titanium sponge and AlM with the granularity of 0.83-12.7 mmoWTi alloy (W content is 17-20%, particle size is 0.25-3 mm), Al-60Mo alloy, Al bean, HZr, Ti-80Sn alloy, Al-10Si alloy, TiO2These master alloys are used as raw materials;
step 2, preparing ingots, namely, mixing raw materials according to the element proportion of TC25 in GB/T3620.1, preparing consumable electrodes, carrying out three times of vacuum consumable melting by adopting a vacuum consumable melting method, wherein the pressure of the last melting stabilization stage is not more than 5Pa, obtaining phi 680mmTC titanium alloy ingots with uniform components, and measuring the β transformation temperature of the ingots to be 1005 ℃;
and step 3: cogging forging
At the cogging forging temperature of 105 ℃ above the β transformation temperature, firstly, upsetting and forging TC25 titanium alloy ingots for 1 time, namely, the 1-time forging heating temperature is 1100 ℃, upsetting and upsetting are carried out for two times to □ 600mm, the forging ratio is 2.9, and air cooling is carried out after forging;
then, upsetting and drawing forging are carried out on the blank for 1 time at the temperature 55 ℃ above the cogging forging temperature, namely the heating temperature of 2-time forging is selected to be 1160 ℃, secondary upsetting and secondary drawing forging are carried out to be □ 600mm, the forging ratio is 3.2, and air cooling is carried out after forging;
step 4, forging above the transformation temperature of β
Heating to 75 ℃ above the β transformation temperature, carrying out upsetting-drawing forging on the blank processed in the step 3 for 1 time, namely selecting 1080 ℃ as the heating temperature of 3-time forging, carrying out two-upsetting-two-drawing forging to □ 600mm, wherein the forging ratio is 3.2, and carrying out air cooling after forging;
and 5: recrystallization homogenization heat treatment forging
Heating to 45 ℃ below the β transformation temperature, performing upsetting-drawing forging on the blank processed in the step 4 for 1 time, namely selecting 960 ℃ as the heating temperature of 4-time forging, performing one-upsetting-one-drawing forging to □ 600mm, wherein the forging ratio is 1.7, returning the forged hot material to a furnace at 1080 ℃ for heat treatment, wherein the heat treatment time is 240min, discharging the heat treatment from the furnace, performing one-upsetting-one-drawing forging to □ 600mm, wherein the forging ratio is selected to be 1.2, and cooling the forged material by air;
step 6 forging below β transformation temperature
And (3) upsetting forging the blank processed in the step (5) at 30 ℃ below the β transformation temperature, namely selecting 975 ℃ for the heating temperature of 5-7 hot forging, upsetting and hot forging to □ 600mm in each hot forging, wherein the forging ratio is 1.6 in each hot forging, and cooling in air after forging.
And 7: forging of finished product
And (4) carrying out 2-time drawing forging on the forging stock in the step (6) at the temperature of 30-50 ℃ below the phase transition point, namely selecting 960 ℃ as the heating temperature of 7-8-time drawing forging, drawing, wherein the drawing ratio is 1.7 per time of drawing, and finally obtaining the finished product with the specification of phi 400 mm.
FIG. 3 is a macroscopic structure diagram of a bar material with the specification of phi 400mm and prepared by forging through the process, and it can be seen that the macroscopic structure diagram has no obvious metallurgical defects and is uniform in structure. Fig. 4 shows the microstructures of the edge and the core of the respective bars, and it can be seen that the microstructures of the edge and the core are very uniform.
Claims (3)
- The processing method of the TC25 titanium alloy large-size bar is characterized by being realized by raw material selection → ingot casting preparation → cogging forging → forging above the transition temperature of β → recrystallization homogenization heat treatment forging → forging below the transition temperature of β → finished product forging, and particularly by the following steps:step 1: selection of raw materialsSelecting sponge titanium with the particle size of 0.83-12.7 mm, AlMoWTi alloy, Al-Mo alloy, Al, HZr, Ti-Sn alloy, Al-Si alloy and TiO2The intermediate alloys are used as raw materials, wherein the content of W in the AlMoWTi alloy is 17-20%, and the granularity is 0.25-3 mm;step 2: preparation of ingotRaw material mixing is carried out according to the content of each element of chemical components required by the GB/T3620.1 standard, three times of vacuum consumable electro-arc furnace smelting is adopted according to the vacuum consumable electro-melting method, the pressure of the last smelting stabilization stage is not more than 5Pa, and a TC25 titanium alloy ingot with uniform components is obtained;and step 3: cogging forgingAt the cogging forging temperature of 80-150 ℃ above the transformation temperature of β, firstly, upsetting and drawing a TC25 titanium alloy ingot for 1 fire, controlling the forging ratio to be 2.5-3.5, and cooling in air after forging;then, upsetting and forging the blank for 1 heating time at the temperature 50-70 ℃ above the cogging forging temperature, controlling the forging ratio to be 2.5-3.5, and cooling the blank in air after forging;step 4, forging above the transformation temperature of βHeating to 50-100 ℃ above the β transformation temperature, carrying out upsetting-drawing forging on the blank processed in the step 3 for 1-2 times, controlling the forging ratio of each time to be 2.5-3.5, and cooling in air after forging;and 5: recrystallization homogenization heat treatment forgingHeating to 30-50 ℃ below the β transformation temperature, upsetting and drawing the blank processed in the step 4 for 1 heating time, controlling the forging ratio to be 1.4-1.8, returning the forged hot material to a furnace for heat treatment, controlling the heating temperature of the heat treatment to be 50-100 ℃ above the β transformation temperature, discharging the blank from the furnace, performing one-upsetting-one-drawing forging, controlling the forging ratio to be 1.1-1.4, and cooling the blank by air after forging;step 6 forging below β transformation temperatureHeating to 20-40 ℃ below the β transformation temperature, upsetting and drawing the blank processed in the step 5 for 2-3 times, controlling the forging ratio of each time to be 1.4-1.8, and cooling in air after forging;and 7: forging of finished productAnd (4) carrying out 2-4 times of hot drawing forging on the forging stock obtained in the step (6) at the temperature of 30-50 ℃ below the phase transition point, controlling the forging ratio of each time to be 1.2-2.8, and carrying out air cooling after the drawing forging.
- 2. The method for processing the TC25 large-size bar with titanium alloy according to claim 1, wherein the heating time of the recrystallization homogenization heat treatment in step 5 is 200-300 min.
- 3. The method for processing the TC25 large-size titanium alloy bar according to claim 1 or 2, wherein the upsetting forging in the steps 3 and 4 is two-upsetting two-drawing; and 5, upsetting forging in the step 6 is upsetting-drawing.
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| CN110586828B (en) * | 2019-10-11 | 2021-06-22 | 湖南金天钛业科技有限公司 | Free forging method of Ti662 titanium alloy large-size bar |
| CN111438317B (en) * | 2020-02-28 | 2021-11-30 | 哈尔滨工业大学（威海） | Preparation method for forging and forming high-strength high-toughness near-beta type titanium alloy forging |
| CN111842747B (en) * | 2020-06-17 | 2022-07-22 | 西部超导材料科技股份有限公司 | Forging method of large-size TA15 titanium alloy special-shaped forging stock |
| CN112045128B (en) * | 2020-09-14 | 2022-10-25 | 湖南湘投金天钛业科技股份有限公司 | Free forging method of TB6 titanium alloy large-size bar |
| CN112338119B (en) * | 2020-10-28 | 2022-09-16 | 湖南湘投金天钛业科技股份有限公司 | Method for forging near-alpha type high-temperature titanium alloy large-size bar |
| CN112676503B (en) * | 2020-11-30 | 2022-12-06 | 湖南湘投金天钛业科技股份有限公司 | Forging processing method for TC32 titanium alloy large-size bar |
| CN112828222A (en) * | 2020-12-30 | 2021-05-25 | 西安西工大超晶科技发展有限责任公司 | Preparation method of multi-component titanium alloy forging |
| CN115261671B (en) * | 2022-07-14 | 2023-12-29 | 宝鸡西工钛合金制品有限公司 | High-temperature titanium alloy with heat resistance and heat processing method thereof |
| CN115595521B (en) * | 2022-10-19 | 2023-07-14 | 湖南湘投金天钛业科技股份有限公司 | Forging method of Ti17 titanium alloy large-size bar with high tissue uniformity |
| CN117403157A (en) * | 2023-10-12 | 2024-01-16 | 西北工业大学 | Preparation method of high-impact-resistance M36 titanium alloy bar |
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Address after: No. 97, Qianming Road, Qingshan Community, Deshan Street, Changde Economic and Technological Development Zone, Changde City, Hunan Province, 415001 Patentee after: Hunan Xiangtou Jintian Titanium Technology Co.,Ltd. Address before: 415000 97 Qianming Road, Deshan Town, Changde economic and Technological Development Zone, Changde City, Hunan Province Patentee before: HUNAN GOLDSKY TITANIUM INDUSTRY TECHNOLOGY Co.,Ltd. |