CN114888219A - Preparation method of Ti6Al4V titanium alloy large-size bar - Google Patents
Preparation method of Ti6Al4V titanium alloy large-size bar Download PDFInfo
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- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
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- B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
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- 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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Abstract
The invention relates to a preparation method of a Ti6Al4V titanium alloy large-size bar, which comprises the following steps: s1, cogging and forging the beta single-phase region with large deformation: the forging fire number is 2 fire numbers, large deformation upsetting forging is carried out on each fire number, and air cooling is carried out after forging. S2, and carrying out large deformation amount diagonal elongation forging on an alpha + beta two-phase region: the forging fire number is 1-2, the large deformation diagonal drawing forging is carried out every fire number, and air cooling is carried out after forging. S3, rapid upsetting-drawing forging of small deformation of a beta single-phase region: 1 heating number of forging, quickly upsetting and drawing the blank, and cooling in air after forging; s4, small deformation amount direct drawing forging of an alpha + beta two-phase region: and (3) performing forging heating times of 3-5 in total, directly drawing and forging the blank, and performing air cooling after forging to obtain the Ti6Al4V titanium alloy large-size bar. The method optimizes the hot working process and flow, reduces the forging heat number, and improves the uniformity and the performance consistency of the bar structure.
Description
Technical Field
The invention belongs to the technical field of nonferrous metal processing, and relates to a preparation method of a Ti6Al4V titanium alloy large-size bar.
Background
The Ti6Al4V titanium alloy is the most widely studied alloy with the largest application amount in the titanium alloy industry at present, has a series of advantages of excellent corrosion resistance, high specific strength, better toughness and weldability and the like, and is widely applied to the aerospace industry field, such as important structural members of aircraft suspension joints, wall plates, fasteners and the like. The existing domestic Ti6Al4V large-size bar has the problems of multiple forging fire times, long processing period, high processing cost and the like, and can not meet the requirements of high reliability, high stability and low cost of civil aircrafts.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a preparation method of a Ti6Al4V titanium alloy large-size bar, which optimizes a hot working process and a flow, reduces the forging heat number, improves the uniformity and the performance consistency of the structure of the bar, cuts a sample from the bar for thermal deformation, verifies the corresponding structure and performance of the bar after subsequent deformation, and finally can successfully produce a civil low-cost high-quality Ti6Al4V titanium alloy bar with the tensile strength of more than 949MPa and the diameter of 200 mm-450 mm.
In order to achieve the purpose, the invention adopts the following technical scheme:
a preparation method of a Ti6Al4V titanium alloy large-size bar is characterized by comprising the following steps:
s1, cogging and forging the beta single-phase region with large deformation:
the forging fire number is 2 fire numbers, large deformation upsetting forging is carried out on each fire number, and air cooling is carried out after forging.
S2, large deformation amount of alpha + beta two-phase region diagonal elongation forging:
the forging fire number is 1-2, the large deformation diagonal drawing forging is carried out every fire number, and air cooling is carried out after forging.
S3, rapid upsetting-drawing forging of small deformation of a beta single-phase region:
1 heating times in total for forging, quickly upsetting and forging the blank, and cooling in air after forging;
s4, small deformation amount direct drawing forging of an alpha + beta two-phase region:
and 3-5 times of forging, namely directly drawing and forging the blank, and cooling in air after forging to obtain the Ti6Al4V titanium alloy large-size bar.
Further, the preparation method further comprises sample upsetting forging:
and (4) performing forging for 1 firing time in total, selecting the bar obtained in the step S4, cutting a sample, heating to the temperature of an alpha + beta two-phase region, preserving heat, discharging, upsetting and forging, and cooling in air after forging.
Furthermore, the heating temperature of the sample upsetting forging is 940-980 ℃, the forging ratio is 2.0-3.0, and the upsetting rate is 20-50 mm/s.
Further, the forging ratio of the large deformation amount is 3.0-5.0, and the forging ratio of the small deformation amount is less than 3.
Further, the heating temperature of the 1 st heating in the step S1 is 1100-1200 ℃, and the heat preservation time is 11-13 h; the heating temperature of the 2 nd heating is 1030-1100 ℃, and the heat preservation time is 9-11 h; the forging ratio per heat is 3.0 to 5.0.
Further, the heating temperature in the step S2 is 930-980 ℃, and the forging ratio per fire is 3.0-4.0.
Further, the forging temperature of the step S3 is 1030-1100 ℃, and the forging ratio is 1.5-3.0.
Further, the heating temperature of the step S4 is 930-970 ℃, and the forging ratio per fire is 1.5-2.5.
Furthermore, the specification of the Ti6Al4V titanium alloy large-specification bar is 200 mm-450 mm
Compared with the prior art, the invention has the following beneficial effects:
considering from the material deformation angle, by designing the corresponding deformation after heating in different phase regions, in the cogging stage, the large deformation cogging forging is carried out in a beta single-phase region, the as-cast crystal grains are fully crushed, and the size of the crystal grains is refined; and finally, small-deformation forging is carried out in an alpha + beta two-phase region in a forming stage, and the stability of the process and the further refinement of crystal grains are ensured through multiple times of small deformation. The method optimizes the hot working process and flow, reduces the forging heat number, improves the uniformity and the performance consistency of the structure of the bar, cuts a sample from the bar for thermal deformation, and verifies the corresponding structure and performance of the bar after subsequent deformation. Finally, the Ti6Al4V titanium alloy bar with low cost and high quality for civil aircraft with the tensile strength of more than 949Mpa and the diameter of 200mm to 450mm can be successfully produced.
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 is a macroscopic structure diagram of a large-sized bar material with a diameter of 250mm prepared in example 1 of the present invention;
FIG. 2(a) is a graph showing the microstructure of the edge of a large-sized bar material with a diameter of 250mm prepared in example 1 of the present invention;
FIG. 2(b) is a r/2 microstructure of a large-sized bar with a diameter of 250mm prepared in example 1 of the present invention;
FIG. 2(c) is a microstructure of the center of a large-sized bar with a diameter of 250mm prepared in example 1 of the present invention;
FIG. 3 is a macroscopic structure diagram of a large-sized bar material with a diameter of 300mm prepared in example 2 of the present invention;
FIG. 4(a) is a view showing the microstructure of the edge of a large-sized bar material with a diameter of 300mm prepared in example 2 of the present invention;
FIG. 4(b) is a r/2 microscopic structure diagram of a large-sized bar material with a diameter of 300mm prepared in example 2 of the present invention
FIG. 4(c) is a microstructure of the core of a large-sized bar with a diameter of 300mm prepared in example 2 of the present invention;
FIG. 5 is a macroscopic structure diagram of a large-sized bar material with 450mm diameter prepared in example 3 of the present invention;
FIG. 6(a) is a view showing the microstructure of the edge of a large-sized bar material of 450mm diameter prepared in example 3 of the present invention;
FIG. 6(b) is a r/2 microscopic structure diagram of a large-sized bar of 450mm diameter prepared in example 3 of the present invention
FIG. 6(c) is the microstructure of the core of a large-sized bar with 450mm diameter prepared in example 3 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. When the following description refers to the accompanying drawings, like 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 apparatus 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.
The invention discloses a preparation method of a Ti6Al4V titanium alloy large-size bar, which specifically comprises the following steps:
step 1, cogging and forging large deformation of a beta single-phase region:
heating the ingot to 1100-1200 ℃ for the 1 st heating time, performing two-upsetting and two-drawing, then performing air cooling, controlling the forging ratio to be 3.0-5.0, keeping the temperature for 11-13 h, and polishing and removing surface cracks of the blank after forging air cooling; heating to 1030-1100 ℃ for 2 nd heating, preserving heat for 9-11 h, performing air cooling after two upsetting and two drawing, controlling the forging ratio to be 3.0-5.0, and polishing and removing cracks on the surface of the blank after forging air cooling.
Heating the blank forged in the step 1 to 930-980 ℃, forging for 1-2 times, carrying out diagonal drawing forging for each time, controlling the forging ratio to be 2.0-4.0 for each time, and finally carrying out air cooling for 1 time of forging.
Step 3, rapid upsetting-drawing forging of small deformation amount of beta single-phase area
And (3) heating the blank forged in the step (2) to 1030-1100 ℃, discharging the blank out of the furnace, performing one-heading one-drawing rapid forging on the blank, controlling the forging ratio to be 1.5-3.0, performing air cooling after forging, and polishing and removing cracks and oxide skin on the surface of the blank after the air cooling is carried out to the room temperature.
Step 4, small deformation direct drawing forging of alpha + beta two-phase region
Heating the blank forged in the step 3 to 930-970 ℃, discharging and then performing direct drawing forging, performing 3-5 times of direct drawing forging on the blank, controlling the forging ratio of each time to be 1.5-2.5, performing direct drawing forging on the blank, and performing air cooling after forging to obtain the Ti6Al4V titanium alloy large-size bar with the diameter of phi 250-phi 450 mm;
step 5, upsetting and forging the sample
And 4, selecting the bar material after the step 4, cutting 1 sample with the thickness of 50 mm-100 mm from the bar material, heating to 940-980 ℃, controlling the forging ratio to be 2.0-3.0, controlling the upsetting rate to be 20 mm/s-50 mm/s, performing air cooling after forging, performing thermal deformation by cutting the sample from the bar material, and verifying the corresponding structure and performance of the bar material after subsequent deformation.
Example 1
Step 1, cogging forging of large deformation amount of beta single-phase region
Selecting a Ti6Al4V titanium alloy ingot with the weight of 7000kg, heating the ingot to 1100 ℃ for the 1 st heating time, preserving heat for 12 hours, performing air cooling after two upsetting and two drawing, wherein the forging ratio is 3.0, and polishing and removing surface cracks of the blank after forging air cooling; heating to 1100 ℃ at the 2 nd heating, preserving heat for 9h, air cooling after two upsetting and two drawing, forging ratio being 4.0, grinding and removing cracks on the surface of the blank after forging air cooling.
And (3) heating the blank obtained in the step (1) to 950 ℃, keeping the temperature for 9h, forging for 2 times, forging at the forging ratio of 4.0, and cooling in air after forging.
Step 3, beta single-phase zone small deformation rapid upsetting-drawing forging
And (3) heating the blank obtained in the step (2) to 1030 ℃, discharging the blank from the furnace, performing one-heading one-drawing rapid forging on the blank, controlling the forging ratio to be 2.5, performing air cooling after forging, and polishing and removing cracks and oxide skin on the surface of the blank after the air cooling is carried out to the room temperature.
Step 4, small deformation direct drawing forging of alpha + beta two-phase region
And (4) heating the blank forged in the step (3) to 970 ℃, discharging and then performing direct drawing forging, performing direct drawing forging on the blank for 5 times, controlling the forging ratio of the first 3 times to be 2.0, controlling the forging ratio of the last 2 times to be 1.5, and performing air cooling after forging to finally produce the Ti6Al4V titanium alloy large-size bar with the diameter phi of 250 mm.
Step 5, upsetting and forging the sample
And 4, selecting the bar prepared in the step 4, cutting 1 sample with the thickness of 100mm from the bar, heating to 940 ℃, controlling the forging ratio to be 2.5 and the upsetting rate to be 20-50 mm/s, and cooling in air after forging.
Example 2
Step 1, cogging and forging of beta single-phase region with large deformation
Selecting a Ti6Al4V titanium alloy ingot with the weight of 7100kg, heating the ingot to 1150 ℃ at the 1 st heating time, preserving heat for 11 hours, performing air cooling after two upsetting and two drawing, performing the forging ratio of 5, and polishing and removing surface cracks of the blank after the air cooling; heating to 1070 ℃ for the 2 nd heating, preserving heat for 10h, performing air cooling after two upsetting and two drawing, forging at the forging ratio of 3, and polishing and removing cracks on the surface of the blank after forging air cooling.
Heating the blank to 930 ℃, keeping the temperature for 10h, forging for 1 firing time in total, forging the blank at the forging ratio of 3.0, and cooling the blank in air after forging.
Step 3, beta single-phase zone small deformation rapid upsetting-drawing forging
Heating the blank to 1050 ℃, discharging from the furnace, performing one-heading one-drawing rapid forging on the blank, controlling the forging ratio to be 1.5, performing air cooling after forging, and polishing and removing cracks and oxide skin on the surface of the blank after the air cooling is performed to room temperature.
Step 4, small deformation direct drawing forging of alpha + beta two-phase region
And (3) heating the blank forged in the step (3) to 930 ℃, discharging and then performing direct drawing forging, wherein 4 times of direct drawing forging are performed on the blank, the first 2 times of direct drawing forging ratio is controlled to be 2.5, the last 2 times of direct drawing forging ratio is controlled to be 1.5, and air cooling is adopted after forging to finally produce the Ti6Al4V titanium alloy large-size bar with the diameter phi of 300 mm.
Step 5, upsetting and forging the sample
And 4, selecting the bar material after the step 4, cutting 1 sample with the thickness of 70mm from the bar material, heating to 960 ℃, controlling the forging ratio to be 3.0, controlling the upsetting rate to be 20-50 mm/s, and cooling in air after forging.
Example 3
Step 1, cogging and forging of beta single-phase region with large deformation
Selecting a Ti6Al4V titanium alloy ingot with the weight of 7000kg, heating the ingot to 1200 ℃ at the 1 st heating time, keeping the temperature for 13 hours, performing air cooling after two upsetting and two drawing, wherein the forging ratio is 4.0, and grinding and removing surface cracks of the blank after forging air cooling; heating to 1030 ℃ for the 2 nd heating, preserving heat for 9.5h, performing air cooling after two upsetting and two drawing, wherein the forging ratio is 5.0, and polishing and removing cracks on the surface of the blank after forging air cooling.
And (3) heating the blank obtained in the step (1) to 980 ℃, preserving heat for 9.5h, forging for 1 heating time and forging ratio for 3.0, and cooling in air after forging.
Step 3, beta single-phase zone small deformation rapid upsetting-drawing forging
And (3) heating the blank obtained in the step (2) to 1100 ℃, discharging the blank from the furnace, performing one-heading one-drawing rapid forging on the blank, controlling the forging ratio to be 1.8, performing air cooling after forging, and polishing and removing cracks and oxide skin on the surface of the blank after the air cooling is carried out to the room temperature.
Step 4, small deformation direct drawing forging of alpha + beta two-phase region
And (3) heating the blank forged in the step (3) to 940 ℃, discharging and then performing direct drawing forging, wherein 3 times of direct drawing forging are performed on the blank, the first 2 times of direct drawing forging ratio is controlled to be 1.8, the last 1 time of direct drawing forging ratio is controlled to be 1.5, and air cooling is adopted after forging to finally produce the Ti6Al4V titanium alloy civil large-size bar with the diameter phi of 450 mm.
Step 5, upsetting and forging the sample
And 4, selecting the bar prepared in the step 4, cutting 1 sample with the thickness of 50mm from the bar, heating to 980 ℃, controlling the forging ratio to be 2.0, controlling the upsetting rate to be 20-50 mm/s, and cooling in air after forging.
FIG. 1, FIG. 3 and FIG. 5 are macrostructure diagrams of Ti6Al4V titanium alloy bars with the specifications of phi 250mm, phi 300mm and phi 450mm, which are forged by the process, respectively, and it can be seen that each position of the macrostructure in FIG. 1, FIG. 3 and FIG. 5 is uniform and fuzzy; fig. 2, 4 and 6 are microstructures of Ti6Al4V titanium alloy bars with the specifications of Φ 250mm, Φ 300mm and Φ 450mm at the edge, r/2 and the center, respectively, and it can be seen that the structures are composed of equiaxial and strip-shaped primary alpha-phase structures, and the difference of different positions is small, so that the structure uniformity of each position of the Ti6Al4V titanium alloy bar prepared by the present application is good, and the bar is uniform.
The room temperature tensile properties of the Ti6Al4V titanium alloy bars with the specification phi of 250mm, phi of 300mm and phi of 450mm in the LT direction and the L direction are tested, the results are shown in Table 1, and the difference of each index of the LT direction tensile property and the L direction tensile property is small as can be seen from the Table 1.
After the Ti6Al4V titanium alloy bar sample obtained in step 5 is upset and forged, the room temperature tensile property of the titanium alloy bar is tested, the results are shown in table 2, it can be seen from table 2 that various indexes of the LT-direction tensile property are improved and greatly improved, and the excellent mechanical property characteristics of the bar are verified from the reverse side, wherein Rm, rp0.2 and A, Z are respectively tensile strength, yield strength, elongation and reduction of area in the room temperature tensile property.
TABLE 1 room temperature tensile properties of Ti6Al4V Ti alloy large-sized bars
TABLE 2 room temperature tensile properties of Ti6Al4V titanium alloy bar samples after upsetting
Considering from the material deformation angle, by designing the corresponding deformation after heating in different phase regions, in the cogging stage, the large deformation cogging forging is carried out in a beta single-phase region, the as-cast crystal grains are fully crushed, and the size of the crystal grains is refined; and finally, small-deformation forging is carried out in an alpha + beta two-phase region in a forming stage, and the stability of the process and the further refinement of crystal grains are ensured through multiple times of small deformation. The large-deformation upsetting forging of the Ti6Al4V titanium alloy bar sample is adopted to predict the corresponding structure and performance after the continuous deformation in the subsequent process, the quality reliability of the bar is verified reversely, and finally the low-cost high-quality Ti6Al4V titanium alloy bar for civil aircraft with the tensile strength of more than 950Mpa and the diameter of 200mm to 450mm can be successfully produced.
The foregoing are merely exemplary embodiments of the present invention, which enable those skilled in the art to understand or practice the present 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 (9)
1. A preparation method of a Ti6Al4V titanium alloy large-size bar is characterized by comprising the following steps:
s1, cogging and forging the beta single-phase region with large deformation:
the forging fire number is 2 fire numbers, large deformation upsetting forging is carried out on each fire number, and air cooling is carried out after forging.
S2, large deformation amount of alpha + beta two-phase region diagonal elongation forging:
the forging fire number is 1-2, the large deformation diagonal drawing forging is carried out every fire number, and air cooling is carried out after forging.
S3, rapid upsetting-drawing forging of small deformation of a beta single-phase region:
1 heating number of forging, quickly upsetting and drawing the blank, and cooling in air after forging;
s4, small deformation amount direct drawing forging of an alpha + beta two-phase region:
and (3) performing forging heating times of 3-5 in total, directly drawing and forging the blank, and performing air cooling after forging to obtain the Ti6Al4V titanium alloy large-size bar.
2. The method for preparing a large-size Ti6Al4V titanium alloy bar according to claim 1, wherein the method further comprises specimen upsetting forging:
and (4) performing forging for 1 firing time in total, selecting the bar obtained in the step S4, cutting a sample, heating to the temperature of an alpha + beta two-phase region, preserving heat, discharging, upsetting and forging, and cooling in air after forging.
3. The method for preparing the large-size Ti6Al4V titanium alloy bar according to claim 2, wherein the sample upsetting forging has a heating temperature of 940-980 ℃, a forging ratio of 2.0-3.0 and an upsetting rate of 20-50 mm/s.
4. The method for preparing the large-size Ti6Al4V titanium alloy bar according to claim 1, wherein the forging ratio of the large deformation is 3.0-5.0, and the forging ratio of the small deformation is less than 3.
5. The method for preparing the Ti6Al4V titanium alloy large-size bar according to claim 1, wherein the heating temperature of the 1 st firing in the step S1 is 1100-1200 ℃, and the holding time is 11-13 h; the heating temperature of the 2 nd heating is 1030-1100 ℃, and the heat preservation time is 9-11 h; the forging ratio per heat is 3.0 to 5.0.
6. The method for preparing the Ti6Al4V titanium alloy large-sized bar according to claim 1, wherein the heating temperature in the step S2 is 930-980 ℃, and the forging ratio per fire is 3.0-4.0.
7. The method for preparing the large-sized Ti6Al4V titanium alloy bar according to claim 1, wherein the forging temperature in step S3 is 1030 ℃ to 1100 ℃, and the forging ratio is 1.5 to 3.0.
8. The method for preparing the large-sized Ti6Al4V titanium alloy bar according to claim 1, wherein the heating temperature in the step S4 is 930-970 ℃, and the forging ratio per fire is 1.5-2.5.
9. The method for preparing the Ti6Al4V Ti alloy large-sized bar according to claim 1, wherein the specification of the Ti6Al4V Ti alloy large-sized bar is 200 mm-phi-450 mm.
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| CN115740306A (en) * | 2022-08-29 | 2023-03-07 | 西部超导材料科技股份有限公司 | Preparation method of Ti6Al4V titanium alloy bar |
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| CN115740306A (en) * | 2022-08-29 | 2023-03-07 | 西部超导材料科技股份有限公司 | Preparation method of Ti6Al4V titanium alloy bar |
| CN115740306B (en) * | 2022-08-29 | 2023-12-19 | 西部超导材料科技股份有限公司 | Preparation method of Ti6Al4V titanium alloy bar |
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