CN115121752A - Preparation method of TC18 titanium alloy large-size bar - Google Patents
Preparation method of TC18 titanium alloy large-size bar Download PDFInfo
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- CN115121752A CN115121752A CN202210685128.0A CN202210685128A CN115121752A CN 115121752 A CN115121752 A CN 115121752A CN 202210685128 A CN202210685128 A CN 202210685128A CN 115121752 A CN115121752 A CN 115121752A
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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
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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
- B21J5/08—Upsetting
Abstract
The invention relates to a preparation method of a TC18 titanium alloy large-size bar, which is implemented by the following steps: cogging and forging: selecting a TC18 titanium alloy ingot, heating, preserving heat, and forging for 2 times to obtain an intermediate blank; forging the intermediate blank: heating and preserving heat of the intermediate blank, and forging for 4 times to obtain a bar blank; forging a finished product: and heating the bar blank, preserving heat, forging for 1 fire time, and rounding to obtain the TC18 titanium alloy bar. The preparation method has the advantages of less forging fire number, less grinding time number, avoidance of the problem of long production period, the prepared bar material with the single weight of 2000 kg-4000 kg and the diameter of phi 500 mm-phi 600mm meets the aviation standard requirements in terms of mechanical properties, and meanwhile, the bar material has the advantages of high and low-order structure and good ultrasonic flaw detection uniformity.
Description
Technical Field
The invention belongs to the technical field of nonferrous metal processing technology, and relates to a preparation method of a TC18 titanium alloy large-size bar.
Background
The TC18 titanium alloy is a high-strength high-toughness near-beta type titanium alloy, the nominal component of the titanium alloy is Ti-5Al-5Mo-5V-1Cr-1Fe, and the titanium alloy is widely applied to key force-bearing parts such as airplane bodies, landing gears, force-bearing frame beams, supporting columns and the like at present. With the development of the aviation industry, new requirements are put forward for the integration and large-scale of force bearing parts of airplanes. For this reason, high quality, large gauge TC18 titanium alloy bars need to be used. The TC18 titanium alloy has low phase change point, large forging deformation resistance, poor forging penetration of large-specification bars and larger 'deformation dead zone'. The traditional process usually adopts methods of small deformation, multiple times of heating and the like to match the relationship between the deformation amount and the structure, and has the defects of long forging period, high cost and poor batch stability. The patent provides a novel preparation method of a large-specification TC18 titanium alloy bar based on the hot working characteristics of a near-beta type titanium alloy, so that the production period and the cost are reduced while a high-quality large-specification TC18 titanium alloy bar is obtained.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a preparation method of a TC18 titanium alloy large-size bar, the preparation method has few forging fire times and few grinding times, and avoids the problem of long production period, the prepared bar has the single weight of 2000 kg-4000 kg and the diameter of phi 500 mm-phi 600mm, the mechanical properties of the bar meet the requirements of aviation standards, and meanwhile, the bar has the advantages of high macroscopic structure and good ultrasonic flaw detection uniformity.
In order to achieve the purpose, the invention adopts the following technical scheme:
the preparation method of the TC18 titanium alloy large-size bar is characterized by comprising the following steps:
s1 cogging forging
Selecting a TC18 titanium alloy ingot, heating, preserving heat, and forging for 2-4 times to obtain an intermediate blank;
s2 forging intermediate billet
Heating and preserving heat of the intermediate blank, and forging for 4-6 times to obtain a bar blank;
s3 forging the finished product
And heating the bar blank, preserving heat, forging for 1-2 times of fire, and rounding to obtain the TC18 titanium alloy bar.
Further, in the step S1, the ingot is heated to 250-350 ℃ above the transformation point, the heat preservation time is 400-600 min, first hot forging is carried out, then the ingot is returned to 250-350 ℃ above the transformation point, the heat preservation time is 200-300 min, second hot forging is carried out, the final forging temperature is not lower than 800 ℃, and the blank is cooled in the air after forging to obtain an intermediate blank.
Further, the TC18 titanium alloy ingot selected in the step S1 has the unit weight of 4.5-6 t and the diameter of phi 690-phi 720 mm.
Further, in the 2-4 times of hot forging of the step S1, the ingot is upset and drawn after being heated and insulated, the forging ratio during upsetting is controlled to be 1.5-2.5, and the deformation during drawing is controlled to be 30-80%;
and upsetting and drawing after the annealing and heat preservation are carried out, the forging ratio is controlled to be 1.5-2.5 during upsetting, the deformation is controlled to be 30-80% during drawing, and a reversing upsetting operation mode is adopted for fire times in part of the forging process to ensure the sufficient refinement and homogenization of beta grains.
Further, the step S2 specifically includes: heating and insulating the intermediate blank at 100-200 ℃ above the transformation point and 30-60 ℃ below the transformation point, respectively forging for 4 times, controlling the forging ratio to be 1.5-2.5 during upsetting, controlling the deformation to be 20-60% during drawing, adopting a reversing upsetting operation mode for part of times, controlling the final forging temperature to be not lower than 600 ℃, and air-cooling the blank after each forging to finally obtain the bar blank.
Further, the specific process of 4-time hot forging in step S2 is: heating the steel plate for the 1 st heating time to 100-200 ℃ above the transformation point, and carrying out upsetting after the heat preservation time is 400-600 min; the heating temperature of the 2 nd heating is 30-60 ℃ below the phase transition point, and the upsetting is carried out after the heat preservation time is 400-600 min; the 3 rd heating temperature is 100-200 ℃ above the variable point, and upsetting and drawing are carried out after the heat preservation time is 400-600 min; the heating temperature of the 4 th heating time is 30-60 ℃ below the phase transition point, and the upsetting and drawing are carried out after the heat preservation time is 400-600 min.
Further, the method for preparing the TC18 titanium alloy large single-weight bar according to claim 1, wherein the specific process of 1-time forging in the step S3 is as follows: heating the bar billet to 30-60 ℃ below the transformation point, keeping the temperature for 400-600 min, drawing and shaping, controlling the diameter of a throwing circle to phi 510-phi 610mm, controlling the deformation to 5-30%, and controlling the finish forging temperature to be not lower than 600 ℃.
Further, the TC18 titanium alloy prepared in the step S3 has the unit weight of 2 t-4 t and the diameter of phi 500 mm-phi 600 mm.
Compared with the prior art, the invention has the following beneficial effects:
the preparation method has the advantages of less forging fire number and less grinding time number, and avoids the problem of long production period; according to the preparation method, the cogging heating adopts a forging heating mode of continuous remelting, so that the growth of broken crystal grains due to overlong heating time is prevented, the refinement degree of the structure is fully ensured, and the uniformity of the structure and the performance is effectively guaranteed; the preparation method adopts a high-low-high cyclic forging process, the traditional high-low-high process is 1 high-low cycle, and the preparation method adopts 2-3 high-low cycles, so that the tissue uniformity is improved; the preparation method partially adopts a forging mode of reversing upsetting and drawing for fire times, and ensures the structure refinement and uniformity in the transverse and longitudinal directions. The prepared bar has the advantages of single weight of 2-4 t, diameter phi of 500-600 mm, mechanical properties meeting aviation standard requirements, high macroscopic structure and good ultrasonic flaw detection uniformity.
Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention.
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.
FIG. 1(a) is a schematic macrostructure diagram of a head of a bar material with a diameter of 550mm prepared in example 1 of the present invention;
FIG. 1(b) is a schematic view of the macrostructure of a tail of a bar material of phi 550mm prepared in example 1 of the present invention;
FIG. 2(a) is a schematic view showing the high magnification organization of the edge of a bar material with a diameter of 550mm prepared in example 1 of the present invention;
FIG. 2(b) is a schematic high power structure of R/2 part of bar material with diameter of 550mm prepared in example 1 of the present invention;
FIG. 2(c) is a schematic high power structure diagram of the core of a bar material with a diameter of 550mm prepared in example 1 of the present invention;
FIG. 3(a) is a schematic view of the structure of the blank burned bar with a diameter of 550mm prepared by the method of example 1;
FIG. 3(b) is a schematic view of the air-burned structure of the tail of a bar material with a diameter of 550mm prepared in example 1 of the present invention;
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. The following description refers to the accompanying drawings in which the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of devices consistent with certain aspects of the invention, as detailed in the appended claims.
In order to make those skilled in the art better understand the technical solution of the present invention, the following detailed description of the present invention is provided with reference to the accompanying drawings and examples.
A preparation method of a TC18 titanium alloy large-size bar comprises the following steps:
s1 cogging forging
Selecting a TC18 titanium alloy ingot with the unit weight of 4.5-6 t and the diameter of phi 690-phi 720mm, heating, preserving heat, forging for 2-4 times by fire, firstly heating the ingot to 250-350 ℃ above the transformation point, preserving heat for 400-600 min, forging for the first time by fire, then returning to 250-350 ℃ above the transformation point, preserving heat for 200-300 min, forging for the second time by fire, wherein the final forging temperature is not lower than 800 ℃, and cooling the blank in the air after forging to obtain an intermediate blank. Selecting a TC18 titanium alloy ingot. In the forging process, the cast ingot is heated and kept warm and then is upset and drawn, the forging ratio during upsetting is controlled to be 1.5-2.5, and the deformation during drawing is controlled to be 30-80%; the operation mode of reversing upsetting and drawing is adopted in part of fire times in the forging process, so that the sufficient refinement and homogenization of beta grains are ensured.
S2 forging intermediate billet
Heating and insulating the intermediate blank at 100-200 ℃ above the transformation point and 30-60 ℃ below the transformation point, forging for 4-6 times, controlling the forging ratio to be 1.5-2.5 during upsetting, controlling the deformation to be 20-60% during drawing, adopting a reversing upsetting operation mode for part of times, controlling the final forging temperature to be not lower than 600 ℃, carrying out upsetting after the insulating time is 400-600 min, carrying out air cooling on the blank after each forging is finished, and finally obtaining the bar blank.
S3, forging the finished product
And heating the bar blank, preserving heat, forging for 1-2 times, and rounding to obtain the TC18 titanium alloy bar. The prepared TC18 titanium alloy has the unit weight of 2 t-4 t and the diameter of phi 500 mm-phi 600 mm. Heating the bar billet to 30-60 ℃ below the transformation point, keeping the temperature for 400-600 min, drawing and shaping, controlling the diameter of a throwing circle to phi 510-phi 610mm, controlling the deformation to 5-30%, and controlling the finish forging temperature to be not lower than 600 ℃.
The following is described with reference to specific process procedures:
example 1:
the invention provides a preparation method of a TC18 titanium alloy large-size bar, which is implemented according to the following steps:
cogging and forging: selecting 4.5 tons of TC18 titanium alloy ingots with the specification of phi 690mm and chemical compositions meeting the requirements, and forging for 2 times: heating the cast ingot to 250 ℃ above a transformation point, keeping the temperature for 400min, forging for the first heating time, upsetting, controlling the forging ratio at 1.8 during upsetting and the deformation at 50% during drawing, returning to the furnace to 250 ℃ above the transformation point, keeping the temperature for 200min, upsetting, controlling the forging ratio at 1.8 during upsetting and the deformation at 50% during drawing, controlling the forged specification to be square with the side length of 600mm, keeping the finish forging temperature at above 800 ℃, and cooling the forged material in an air cooling manner to obtain an intermediate billet. The cogging heating adopts a forging heating mode of continuous remelting, prevents the crystal grains from growing up due to overlong heating time after being crushed, fully ensures the tissue refining degree, and effectively ensures the uniformity of the tissue and the performance.
Forging the intermediate blank: and the intermediate blank forging is completed by 4 fires. Heating at 1000 deg.C for 1 st fire, maintaining for 500min, and upsetting; heating the No. 2 fire at 820 deg.C, maintaining for 500min, and upsetting; heating at 1000 deg.C for 3 rd fire, maintaining for 500min, and upsetting; the heating temperature of the 4 th fire is 820 ℃, the upsetting is carried out after the heat preservation is carried out for 420min, the forging ratio of the upsetting of the previous fire is controlled to be 1.8, the deformation is controlled to be 40% when the upsetting is carried out, the specification after the 4 th fire forging is that the section diameter is 580mm, the finish forging temperature is controlled to be more than 600 ℃, and the cooling is carried out in an air cooling mode after the forging of each fire.
Forging a finished product: and (5) finishing the forging of the finished product by 1 fire. Heating temperature of the 1 st fire is 820 ℃, directly drawing and shaping to phi 560mm after heat preservation for 420min, wherein deformation of the straight drawing is 8%, final forging temperature is controlled to be above 600 ℃, cooling in an air cooling mode after finishing the heat of forging of finished products, and turning into the phi 550mm bar by a lathe.
Macroscopic structure observation is carried out on the bar with the diameter of 550mm prepared in the example 1, and as can be seen from the figure 1, the head and the tail of the macroscopic structure of the bar have no delamination, cracks, pores, segregation, metal and nonmetal inclusions and other macroscopic metallurgical defects; no clear grains visible to naked eyes, uniform and fuzzy macrostructure and capability of meeting the requirement of aviation standard.
High power structure observation is carried out on the bar with the diameter of 550mm prepared in the example 1, and as can be seen from figure 2, the microstructure of the bar is a uniform structure processed in an alpha + beta two-phase region, all original beta crystal boundaries are fully crushed, continuous and straight crystal boundary alpha phases do not exist, the high power structure of the microstructure is uniform, and the requirement of aviation standards is met.
The head and the tail of the bar material with the diameter of 550mm prepared in the example 1 are subjected to empty burning structure observation, and according to the graph in fig. 3, the empty burning has no obvious layered structure, and meets the requirement of aviation standard.
After the bar with the diameter of 550mm prepared in example 1 is subjected to heat treatment, a transverse sample is taken to test the room temperature performance, the requirement of aviation standard is met, the uniformity is good, a certain margin is provided, the mechanical property of the bar is good, and the mechanical property test result is shown in table 1.
Table 1:
the ultrasonic flaw detection results of the bar material with the diameter of 550mm prepared in the embodiment 1 are uniform and consistent, and the requirements of the diameter of 2.0-6dB are met.
Example 2
The invention provides a preparation method of a TC18 titanium alloy large-size bar, which is implemented according to the following steps:
cogging and forging: selecting 6 tons of TC18 titanium alloy ingots with the specification of phi 720mm and the chemical composition meeting the requirements, and forging for 2 times: heating at 1200 ℃, keeping the temperature for 600min, upsetting, controlling the forging ratio at 2.5 during upsetting and the deformation at 30% during drawing, returning to 1150 ℃ and keeping the temperature for 200min, upsetting, controlling the forging ratio at 1.5 during upsetting and the deformation at 30% during drawing, wherein the forged specification is a square with the side length of 600mm, the final forging temperature is controlled above 800 ℃, obtaining an intermediate billet, and cooling the forged material in an air cooling manner.
Forging the intermediate blank: and the intermediate blank forging is completed by 4 fires. Heating at 1050 deg.C in the No. 1 fire, maintaining the temperature for 400min, and upsetting; heating the 2 nd fire at 850 ℃, keeping the temperature for 400min, and then upsetting and drawing; heating at 1050 deg.C for the No. 3 fire, maintaining the temperature for 400min, and upsetting; the heating temperature of the 4 th fire is 850 ℃, the upsetting is carried out after the heat preservation for 400min, the forging ratio of the upsetting of the previous fire is controlled to be 1.5, the deformation is controlled to be 40% when the upsetting is carried out, the specification after the 4 th fire forging is that the section diameter is 580mm, the finish forging temperature is controlled to be more than 600 ℃, and the cooling is carried out in an air cooling mode after the forging of each fire.
Forging a finished product: and (5) forging the finished product by 1 fire. Heating temperature of the No. 1 fire is 850 ℃, keeping the temperature for 400min, then directly drawing and shaping to phi 560mm, deformation of the straight drawing is 8%, and final forging temperature is controlled to be above 600 ℃. And cooling the finished product in an air cooling mode after the forging fire number is finished, and turning the finished product into a bar with the diameter of 500mm by using a lathe.
Example 3
The invention provides a preparation method of a TC18 titanium alloy large-size bar, which is implemented according to the following steps:
cogging and forging: selecting 5 tons of TC18 titanium alloy ingots with the specification of phi 700mm and chemical compositions meeting the requirements, and forging for 2 times: heating to 1150-1200 ℃, keeping the temperature for 600min, upsetting, controlling the forging ratio at 2.5 during upsetting and the deformation at 50% during drawing, returning to 1150 ℃ and keeping the temperature for 300min, upsetting, controlling the forging ratio at 2.5 during upsetting and the deformation at 50% during drawing, controlling the section of the forged blank to be square with the side length of 600mm, controlling the final forging temperature to be more than 800 ℃ to obtain an intermediate blank, and cooling the forged blank in an air cooling mode.
Forging the intermediate blank: and the intermediate blank forging is completed by 4 fires. Heating the No. 1 fire at 1000-1050 ℃, and carrying out upsetting and drawing after heat preservation for 600 min; the heating temperature of the No. 2 fire is 820-850 ℃, and the upsetting and the drawing are carried out after the heat preservation for 600 min. The heating temperature of the No. 3 fire is 1000-1050 ℃, and the upset drawing is carried out after the heat preservation is carried out for 600 min. The heating temperature of the 4 th fire is 820-850 ℃, the upsetting is carried out after the heat preservation is 540min, the forging ratio of the upsetting of the previous fire is controlled to be 2.5, the deformation is controlled to be 60% when the upsetting is carried out, the specification after the 4 th fire forging is that the section diameter is 580mm, the finish forging temperature is controlled to be more than 600 ℃, and the cooling is carried out by adopting an air cooling mode after the forging of each fire.
Forging a finished product: and (5) forging the finished product by 1 fire. The heating temperature of the No. 1 fire is 850 ℃, the straight drawing and shaping are carried out to phi 560mm after the heat preservation is carried out for 540min, the deformation amount of the straight drawing is 8 percent, and the final forging temperature is controlled to be more than 600 ℃. And cooling the finished product in an air cooling mode after the forging fire number is finished, and turning the finished product into a phi 600mm bar by a lathe.
The above description is merely illustrative of particular embodiments of the invention that enable those skilled in the art to understand or practice the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention.
It is to be understood that the present invention is not limited to what has been described above, and that various modifications and changes may be made without departing from the scope thereof. The scope of the invention is limited only by the appended claims.
Claims (8)
1. The preparation method of the TC18 titanium alloy large-size bar is characterized by comprising the following steps:
s1 cogging forging
Selecting a TC18 titanium alloy ingot, heating, preserving heat, and forging for 2-4 times to obtain an intermediate blank;
s2 forging intermediate billet
Heating and preserving heat of the intermediate blank, and forging for 4-6 times to obtain a bar blank;
s3 forging the finished product
And heating the bar blank, preserving heat, forging for 1-2 times, and rounding to obtain the TC18 titanium alloy bar.
2. The method for preparing the TC18 large-size titanium alloy bar according to claim 1, wherein the ingot is heated to 250-350 ℃ above the transformation point in the step S1, the temperature is kept for 400-600 min, the first fire forging is carried out, then the ingot is cooled to 250-350 ℃ above the transformation point, the temperature is kept for 200-300 min, the second fire forging is carried out, the final forging temperature is not lower than 800 ℃, and the blank is cooled in the air after the forging to obtain an intermediate blank.
3. The method for preparing the TC18 titanium alloy large-size bar as recited in claim 1, wherein the TC18 titanium alloy ingot selected in the step S1 has a unit weight of 4.5-6 t and a diameter of phi 690-phi 720 mm.
4. The method for preparing the TC18 titanium alloy large-size bar according to claim 2, wherein in the 2-4 times of forging of step S1, the ingot is upset and drawn after being heated and kept warm, the forging ratio during upsetting is controlled to be 1.5-2.5, and the deformation during drawing is controlled to be 30-80%;
and upsetting and drawing are carried out after the furnace is returned and the temperature is kept, the forging ratio during upsetting is controlled to be 1.5-2.5, the deformation during drawing is controlled to be 30-80%, and the operation mode of reversing upsetting and drawing is adopted for several times in the forging process, so that the sufficient refinement and homogenization of beta grains are ensured.
5. The method for preparing the TC18 titanium alloy large-size bar according to claim 1, wherein the step S2 comprises the following steps: heating and insulating the intermediate blank at 100-200 ℃ above the transformation point and 30-60 ℃ below the transformation point, respectively forging for 4 times, controlling the forging ratio to be 1.5-2.5 during upsetting, controlling the deformation to be 20-60% during drawing, adopting a reversing upsetting operation mode for part of times, controlling the final forging temperature to be not lower than 600 ℃, and air-cooling the blank after each forging to finally obtain the bar blank.
6. The method for preparing the TC18 titanium alloy large-sized bar according to claim 1 or 4, wherein the specific process of 4-time forging in the step S2 comprises the following steps: heating the steel plate for the 1 st heating time to 100-200 ℃ above the transformation point, and carrying out upsetting after the heat preservation time is 400-600 min; the heating temperature of the 2 nd heating is 30-60 ℃ below the phase transition point, and the upsetting is carried out after the heat preservation time is 400-600 min; the 3 rd heating temperature is 100-200 ℃ above the variable point, and upsetting and drawing are carried out after the heat preservation time is 400-600 min; the heating temperature of the 4 th fire is 30-60 ℃ below the transformation point, and the upsetting and the drawing are carried out after the heat preservation time is 400-600 min.
7. The method for preparing the TC18 titanium alloy large-size bar according to claim 1, wherein the method for preparing the TC18 titanium alloy large-single-weight bar according to claim 1 is characterized in that the specific process of 1-time forging in the step S3 is as follows: heating the bar billet to 30-60 ℃ below the phase transition point, keeping the temperature for 400-600 min, then drawing and shaping, wherein the diameter of a throwing circle is phi 510-phi 610mm, the deformation is controlled at 5-30%, and the final forging temperature is not lower than 600 ℃.
8. The method for preparing the TC18 titanium alloy large-sized bar material as recited in claim 1, wherein the TC18 titanium alloy prepared in the step S3 has the unit weight of 2t to 4t and the diameter of phi 500mm to phi 600 mm.
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| CN116770116A (en) * | 2023-08-17 | 2023-09-19 | 成都先进金属材料产业技术研究院股份有限公司 | Weak texture TA18 titanium alloy bar and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116770116A (en) * | 2023-08-17 | 2023-09-19 | 成都先进金属材料产业技术研究院股份有限公司 | Weak texture TA18 titanium alloy bar and preparation method thereof |
| CN116770116B (en) * | 2023-08-17 | 2023-12-01 | 成都先进金属材料产业技术研究院股份有限公司 | Weak texture TA18 titanium alloy bar and preparation method thereof |
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