CN117696669B - Thin bar for Ti2AlNb alloy bolt and preparation method thereof - Google Patents
Thin bar for Ti2AlNb alloy bolt and preparation method thereof Download PDFInfo
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- 239000000956 alloy Substances 0.000 title claims abstract description 60
- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 60
- 238000002360 preparation method Methods 0.000 title claims abstract description 22
- 238000005096 rolling process Methods 0.000 claims abstract description 48
- 238000010438 heat treatment Methods 0.000 claims abstract description 23
- 238000004519 manufacturing process Methods 0.000 claims abstract description 20
- 238000001816 cooling Methods 0.000 claims description 24
- 238000010791 quenching Methods 0.000 claims description 17
- 230000000171 quenching effect Effects 0.000 claims description 17
- 238000004321 preservation Methods 0.000 claims description 13
- 239000003795 chemical substances by application Substances 0.000 claims description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 239000011159 matrix material Substances 0.000 claims description 4
- 238000001953 recrystallisation Methods 0.000 abstract description 8
- 125000004122 cyclic group Chemical group 0.000 abstract description 3
- 238000000034 method Methods 0.000 description 20
- 230000008569 process Effects 0.000 description 16
- 230000000052 comparative effect Effects 0.000 description 12
- 239000000463 material Substances 0.000 description 11
- 238000005242 forging Methods 0.000 description 10
- 238000012360 testing method Methods 0.000 description 7
- 230000035515 penetration Effects 0.000 description 6
- 230000037314 wound repair Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 238000007599 discharging Methods 0.000 description 4
- 238000003754 machining Methods 0.000 description 4
- 208000027418 Wounds and injury Diseases 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 230000006378 damage Effects 0.000 description 3
- 208000014674 injury Diseases 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 238000007670 refining Methods 0.000 description 3
- 230000008439 repair process Effects 0.000 description 3
- 239000013078 crystal Substances 0.000 description 2
- 238000011534 incubation Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
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- 238000006467 substitution reaction Methods 0.000 description 1
- 230000000930 thermomechanical effect Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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Abstract
The invention relates to the technical field of Ti2AlNb alloy fasteners, in particular to a thin bar for a Ti2AlNb alloy bolt and a preparation method thereof. The preparation method of the bar comprises the following steps: (a) Drawing and cogging a Ti2AlNb alloy cast ingot in the temperature range of a B2 single-phase region, and then rolling in the temperature range of a B2 plus O two-phase region to obtain a bar blank; (b) And (3) after the bar blank is insulated and thermally penetrated at 1040-1060 ℃, performing first rolling in the temperature range of the B2+O two-phase region, performing second rolling in the B2+alpha two-phase region, and performing heat treatment. The invention adopts unidirectional cogging for direct drawing, combines with cyclic thermal mechanical treatment, refines grains through recrystallization, and then prevents the grains from growing up through low temperature, thus obtaining the expected tri-state structure; and the production period is greatly shortened, and the yield is high.
Description
Technical Field
The invention relates to the technical field of Ti2AlNb alloy fasteners, in particular to a thin bar for a Ti2AlNb alloy bolt and a preparation method thereof.
Background
With the development of the alloy, the application range of the alloy is also expanding continuously. The alloys can be connected by welding, riveting and the like, and can also be connected and fastened by bolts. Along with the continuous improvement of the requirements of the fields such as aerospace and the like on the light high-temperature Ti2AlNb alloy, the application requirements on the bolt for the Ti2AlNb alloy are also provided.
The bolt is required to be manufactured by forging a bar, and the bolt is generally suitable for forging due to the smaller diameter of the boltThin bars of the specification. However, the existing technology mainly comprises the production/>, of upsetting and pulling cogging of a quick forging machineIf the bar material with the specification is obtained by adopting the existing production process to prepare the thin bar material, the production period is longer, the forging number of times is more, and the yield is low. Thus, there is a need to develop a process suitable for the preparation/> The method for manufacturing the thin bars is used for manufacturing and applying Ti2AlNb alloy bolts.
In view of this, the present invention has been made.
Disclosure of Invention
The invention aims to provide a preparation method of a thin bar for a Ti2AlNb alloy bolt.
The invention also aims to provide the thin bar for the Ti2AlNb alloy bolt prepared by the method.
In order to achieve the above object of the present invention, the present invention provides a method for producing a thin rod for a Ti2 ainb alloy bolt, comprising the steps of:
(a) Drawing and cogging a Ti2AlNb alloy cast ingot in the temperature range of a B2 single-phase region, and then rolling in the temperature range of a B2 plus O two-phase region to obtain a bar blank;
(b) And (3) carrying out heat preservation and penetration on the bar blank at 1040-1060 ℃, carrying out first rolling in the temperature range of the B2+O two-phase region, then carrying out second rolling in the B2+alpha two-phase region, and carrying out heat treatment to obtain the thin bar for the Ti2AlNb alloy bolt.
In a specific embodiment of the present invention, the temperature of the B2 single-phase region is 1150-1170 ℃.
In a specific embodiment of the present invention, in the drawn and cogged ingot, the total deformation amount of the drawn ingot is 65% to 85%. Further, the drawing and cogging comprises three drawing steps, wherein the deformation of the first drawing is 35% -55%, the deformation of the second drawing is 30% -50%, and the deformation of the third drawing is 25% -45%.
In a specific embodiment of the present invention, the temperature of the b2+o two-phase zone is 920 to 950 ℃.
In a specific embodiment of the present invention, the temperature of the b2+α two-phase zone is 1000 to 1040 ℃.
In a specific embodiment of the present invention, in the step (a), the total deformation amount of the rolling is 40% to 60%.
In a specific embodiment of the present invention, the deformation amount in the first rolling is 65% to 80%.
In a specific embodiment of the present invention, the deformation amount in the second rolling is 55% to 75%.
In a specific embodiment of the present invention, in step (b), the heat treatment comprises: heat preservation is carried out for 3 to 4 hours at 950 to 980 ℃, and then quenching is carried out; then preserving heat for 24-26 h at 760-800 ℃ and then air cooling. Further, the quenched medium comprises water and a quenching agent, wherein the quenching agent is PAG water-soluble quenching agent.
In a specific embodiment of the invention, the diameter of the slim rod is 30-50 mm.
The invention also provides a thin bar for the Ti2AlNb alloy bolt, which is prepared by adopting any one of the preparation methods.
In the concrete embodiment of the invention, in the thin bar for the Ti2AlNb alloy bolt, the volume fraction of the alpha 2 phase is 1-5%, and the size is 1-5 mu m; the volume fraction of the O phase is 70% -85%, the primary O phase with the size of 1-5 μm accounts for 15% -30%, and the secondary O phase with the size smaller than 1 μm accounts for 55% -70%; the matrix B2 accounts for 10-30 percent.
Compared with the prior art, the invention has the beneficial effects that:
(1) According to the preparation method of the thin bar, a repeated upsetting and pulling process route in the preparation of the large-size bar is omitted, unidirectional cogging is adopted for direct pulling, cyclic thermal mechanical treatment is matched, grains are refined through recrystallization, and the operations of grain growth prevention and the like are carried out at low temperature, so that the expected tri-state structure is obtained; the production period of the final process is greatly shortened, and the yield of the thin bars is high;
(2) The preparation method of the invention is adopted to successfully prepare The thin bar with the specification is successfully used for preparing the bolt, and the room temperature yield strength of the prepared bolt is more than or equal to 900MPa, and the room temperature shear strength of the prepared bolt is more than or equal to 750MPa.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a process route of a conventional Ti2AlNb alloy bar;
FIG. 2 is a schematic diagram of a process route of a thin bar for a Ti2AlNb alloy bolt;
FIG. 3 is a cross-sectional high-power structure diagram of a thin rod for a Ti2AlNb alloy bolt of the invention;
Fig. 4 is a high-magnification chart of the cross section of the thin bar material for the Ti2 ainb alloy bolt provided in example 1 of the present invention at another magnification.
Detailed Description
The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings and detailed description, but it will be understood by those skilled in the art that the examples described below are some, but not all, examples of the present invention, and are intended to be illustrative of the present invention only and should not be construed as limiting the scope of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention. The specific conditions are not noted in the examples and are carried out according to conventional conditions or conditions recommended by the manufacturer. The reagents or apparatus used were conventional products commercially available without the manufacturer's attention.
FIG. 1 is a schematic view of a conventional Ti2AlNb alloy bar, in which, in the conventional processing of the Ti2AlNb alloy bar, repeated upsetting and drawing processes are sequentially performed in the temperature ranges of the B2 single-phase region, the B2+α two-phase region, the B2+α+O three-phase region and the B2+O two-phase region to obtain And then, drawing and other processes are needed to obtain the bars with corresponding specifications. This method is mainly applicable to/>The production of bars with the specification above, the production period is long, the forging fire is more, and the yield is low.
The bolts need to be made by bar forging, however, due to the smaller diameter of the bolts, it is generally appropriate to forge the boltsThin bars of the specification. The existing process route for preparing the Ti2AlNb alloy bar is not suitable forAnd (5) processing and producing the thin bars with the specification.
Based on the above, the invention provides a preparation method of a thin bar for a Ti2AlNb alloy bolt, which comprises the following steps:
(a) Drawing and cogging a Ti2AlNb alloy cast ingot in the temperature range of a B2 single-phase region, and then rolling in the temperature range of a B2 plus O two-phase region to obtain a bar blank;
(b) And (3) carrying out heat preservation and penetration on the bar blank at 1040-1060 ℃, carrying out first rolling in the temperature range of the B2+O two-phase region, then carrying out second rolling in the B2+alpha two-phase region, and carrying out heat treatment to obtain the thin bar for the Ti2AlNb alloy bolt.
Fig. 2 is a schematic diagram of a process route of a thin rod for a Ti2 ainb alloy bolt according to the present invention, and as can be seen from the combination of fig. 2, the present invention refines grains by recrystallization through a cyclic thermo-mechanical treatment technique, i.e., a high temperature-low temperature-high temperature manner, and prevents the grains from growing through low temperature, thereby finally obtaining a desired tri-state structure. By accumulating enough deformation energy under the phase change point and then heating to the temperature of the phase change temperature point, the B2 crystal grains are recrystallized by utilizing the phase change recrystallization principle while the alpha 2/O phase is dissolved, so that a uniform and fine single-phase recrystallization structure is formed; and cooling to the temperature below the phase transition point to precipitate uniform and fine alpha 2/O phase strips in the B2 crystal grains, and forming a uniform and fine two-phase structure through re-deformation.
In addition, compared with the process route of the thin bar and the process route of the bar in the prior art, the process route of the thin bar omits repeated upsetting and pulling process route, reduces a deformation temperature by heat treatment, directly pulls out the thin bar by unidirectional cogging, greatly shortens the final process production period and has high yield of the thin bar.
Wherein, the heat preservation treatment time in each temperature range can be adjusted and selected according to the conventional heat treatment heat preservation time in the field.
As in the various embodiments, in step (b), the soak-out temperature may be 1040 ℃, 1045 ℃, 1050 ℃, 1055 ℃, 1060 ℃ or a range of any two thereof. And after heat preservation and penetration, discharging and air cooling. Under the above temperature conditions, the grain size of the rod blank can be thinned to 100 to 500 μm or less.
In a specific embodiment of the present invention, the temperature of the B2 single-phase zone is 1150-1170 ℃.
As in the various embodiments, the temperature of the B2 single-phase region may be 1150 ℃, 1155 ℃, 1160 ℃, 1165 ℃, 1170 ℃ or a range of any two of these.
In a specific embodiment of the present invention, the total deformation amount of the drawn part is 65% to 85%. Further, the drawing and cogging comprises three times of drawing, wherein the deformation of the first drawing is 35% -55%, the deformation of the second drawing is 30% -50%, and the deformation of the third drawing is 25% -45%.
In actual operation, the drawing and cogging is one-way drawing and cogging, an axial drawing mode is adopted, the drawing and cogging can be performed on a radial forging machine, and in the process of multiple drawing, when the temperature is reduced, a hot material returning mode is adopted. As in the various embodiments, the total deformation of the draw may be 65%, 70%, 75%, 80%, 85% or a range of any two of these. The first elongation may have a deformation of 35%, 40%, 45%, 50%, 55% or any two thereof, the second elongation may have a deformation of 30%, 35%, 40%, 45%, 50% or any two thereof, and the third elongation may have a deformation of 25%, 30%, 35%, 40%, 45% or any two thereof.
In actual operation, the drawing and cogging process further comprises chamfering and rounding treatment.
In a specific embodiment of the invention, the temperature of the B2+O two-phase zone is 920 to 950 ℃.
As in the various embodiments, the temperature of the b2+o two-phase region may be 920 ℃, 925 ℃, 930 ℃, 935 ℃, 940 ℃, 945 ℃, 950 ℃ or a range of any two of these. The temperatures of the b2+o two-phase zones in step (a) and step (B) may each be independently selected from the above values or ranges.
In a specific embodiment of the invention, the temperature of the b2+α two-phase zone is between 1000 and 1040 ℃.
As in the various embodiments, the temperature of the b2+α two-phase region may be 1000 ℃, 1010 ℃, 1020 ℃, 1030 ℃, 1040 ℃, or a range of any two of these.
In a specific embodiment of the present invention, in step (a), the total rolling deformation is 40% to 60%.
As in the various embodiments, in step (a), the total rolling deformation may be 40%, 45%, 50%, 55%, 60% or a range of any two of these compositions.
In actual operation, rolling can be performed on a rolling mill, and rolling can be performed once after primary rolling and secondary rolling after hot material returning, so that the total deformation is ensured to be within the range.
In a specific embodiment of the present invention, the deformation amount in the first rolling is 65% to 80%.
As in the various embodiments, the amount of deformation in the first pass may be 65%, 70%, 75%, 80% or a range of any two of these compositions.
In a specific embodiment of the present invention, the deformation amount in the second rolling is 55% to 75%.
As in the different embodiments, the amount of deformation in the second rolling may be 55%, 60%, 65%, 70%, 75% or a range of any two of these compositions.
In a specific embodiment of the present invention, in step (b), the heat treatment comprises: heat preservation is carried out for 3 to 4 hours at 950 to 980 ℃, and then quenching is carried out; then preserving heat for 24-26 h at 760-800 ℃ and then air cooling. Further, the quenching medium comprises water and a quenching agent, wherein the quenching agent is PAG water-soluble quenching agent.
In the heat treatment of the step (b), the heat can be preserved for 3 hours, 3.5 hours, 4 hours and the like at 950 ℃, 960 ℃, 970 ℃, 980 ℃ or any two of the above ranges, and then quenching is carried out; then preserving the heat for 24 hours, 25 hours, 26 hours and the like at 760 ℃, 770 ℃, 780 ℃, 790 ℃ and 800 ℃ or in the range of any two of the above, and then air-cooling. The quenching medium comprises water and PAG water-soluble quenching agent, wherein the concentration of the PAG water-soluble quenching agent can be 5-15%.
In a specific embodiment of the invention, the diameter of the thin rod is 30-50 mm.
As in the various embodiments, the diameter of the thin rod may be 30mm, 35mm, 40mm, 45mm, 50mm or a range of any two of these. The preparation method can successfully prepare the thin bar with the diameter of 30-50 mm, has uniform structure and excellent performance, and meets the requirement of preparing bolts.
The Ti2AlNb alloy can provide a high-efficiency preparation process route for preparing the thin bar from the Ti-22Al-25Nb alloy.
The invention also provides a thin bar for the Ti2AlNb alloy bolt, which is prepared by adopting any one of the preparation methods.
In the concrete embodiment of the invention, in the thin bar for the Ti2AlNb alloy bolt, the volume fraction of the alpha phase is 1-5%, and the size is 1-5 mu m; the volume fraction of the O phase is 70% -85%, the primary O phase with the size of 1-5 μm accounts for 15% -30%, and the secondary O phase with the size smaller than 1 μm accounts for 55% -70%; the matrix B2 accounts for 10-30 percent.
As in the various embodiments, in the thin bar for Ti2 ainb alloy bolt, the volume fraction of the alpha phase may be in the range of 1%, 2%, 3%, 4%, 5% or any two of these, and the size may be in the range of 1 μm, 2 μm, 3 μm, 4 μm, 5 μm or any two of these; the volume fraction of the O phase may be in the range of 70%, 72%, 75%, 78%, 80%, 82%, 85% or any two thereof, the volume fraction of the primary O phase of 1-5 μm in size may be in the range of 15%, 18%, 20%, 22%, 25%, 28%, 30% or any two thereof, and the volume fraction of the secondary O phase of < 1 μm in size may be in the range of 55%, 56%, 57%, 58%, 59%, 60%, 62%, 65%, 68%, 70% or any two thereof; the volume fraction of matrix B2 phase may be 10%, 15%, 20%, 25%, 30% or a range of any two of these.
In a specific embodiment of the invention, the primary O phase has an average size of 2 to 2.8. Mu.m.
The invention also provides a Ti2AlNb alloy bolt, which is manufactured by machining any one of the Ti2AlNb alloy bolts by using a thin bar.
In the specific embodiment of the invention, the room temperature yield strength of the Ti2AlNb alloy bolt is more than or equal to 900MPa, and the room temperature shear strength is more than or equal to 750MPa.
Example 1
The embodiment provides a preparation method of a thin bar for a Ti2AlNb alloy bolt, which comprises the following steps:
(1) Will be of the size of The Ti2AlNb cast ingot is kept at 1160 ℃ for 380min, is subjected to unidirectional drawing and cogging on a radial forging machine, is axially drawn to 280 multiplied by 1430mm, is axially drawn to 220 multiplied by 2320mm after being returned to a furnace, is axially drawn to 180 multiplied by 3400mm after being returned to the furnace, and is equally divided after air cooling and wound repair. Re-charging chamfering, rounding to/>The single-phase region high temperature recrystallization grains are uniform to 1-3 mm through the step B2.
(2) The size obtained in the step (1) isPreserving heat at 935 ℃ for 170min, rolling on a rolling mill to a value of/>Hot material is rolled to/> afterreturning to the furnaceThree-phase after air-cooling injury repair.
(3) And (3) carrying out heat preservation and penetration on the rod blank treated in the step (2) at 1050 ℃, discharging the rod blank, carrying out air cooling, and refining the grain size to be less than 100-500 mu m.
(4) The size after the treatment in the step (3) isPreserving the temperature at 935 ℃ for 120min, and rolling on a rolling mill for the first time to obtain/>And (3) carrying out air cooling on the thin bars with the specification, and carrying out three-uniform division after wound repair.
(5) The size after the treatment in the step (4) isPreserving the heat at 1020 ℃ for 60min, and rolling for the second time on a rolling mill to obtain/>And (5) carrying out air cooling on the thin bars with the specification.
(6) For the treated product in step (5)Carrying out heat treatment on the thin bars with the specification, wherein the heat treatment system is that after the heat treatment is carried out for 3 hours at 960 ℃, the PAG is quenched by water (the PAG concentration is 10%), and then the heat treatment is carried out for 24 hours at 780 ℃ and then the air cooling is carried out.
For the step (6)Machining the thin bar material to obtain/>A bolt of diameter.
Example 2
The embodiment provides a preparation method of a thin bar for a Ti2AlNb alloy bolt, which comprises the following steps:
(1) Will be of the size of The Ti2AlNb cast ingot is insulated for 380min at 1150 ℃, is subjected to unidirectional drawing and cogging on a radial forging machine, is axially drawn to 280 multiplied by 1430mm, is axially drawn to 220 multiplied by 2320mm after being returned to a furnace, is axially drawn to 180 multiplied by 3400mm after being returned to the furnace, and is equally divided after air cooling and wound repair. Re-charging chamfering, rounding to/>The single-phase region high temperature recrystallization grains are uniform to 1-3 mm through the step B2.
(2) The size obtained in the step (1) isHeat-preserving for 170min at 920 ℃, rolling on a rolling mill until the temperature reaches/>Hot material is rolled to/> afterreturning to the furnaceThree-phase after air-cooling injury repair.
(3) And (3) carrying out heat preservation and penetration on the bar blank treated in the step (2) at 1040 ℃, discharging the bar blank, carrying out air cooling, and refining the grain size to be less than 100-500 mu m.
(4) The size after the treatment in the step (3) isHeat-preserving for 120min at 920 ℃, and performing first rolling on a rolling mill to obtain/>And (3) carrying out air cooling on the thin bars with the specification, and carrying out three-uniform division after wound repair.
(5) The size after the treatment in the step (4) isPreserving the temperature of the bar stock at 1000 ℃ for 60min, and rolling for the second time on a rolling mill to obtain/>And (5) carrying out air cooling on the thin bars with the specification.
(6) For the treated product in step (5)Carrying out heat treatment on the thin bars with the specification, wherein the heat treatment system is that after the heat treatment is carried out for 3 hours at 960 ℃, the PAG is quenched by water (the PAG concentration is 10%), and then the heat treatment is carried out for 24 hours at 780 ℃ and then the air cooling is carried out.
For the step (6)Machining the thin bar material to obtain/>A bolt of diameter.
Example 3
The embodiment provides a preparation method of a thin bar for a Ti2AlNb alloy bolt, which comprises the following steps:
(1) Will be of the size of The Ti2AlNb cast ingot is kept at 1170 ℃ for 380min, is subjected to unidirectional drawing and cogging on a radial forging machine, is axially drawn to 280 multiplied by 1430mm, is axially drawn to 220 multiplied by 2320mm after being returned to a furnace, is axially drawn to 180 multiplied by 3400mm after being returned to the furnace, and is equally divided after air cooling and wound repair. Re-charging chamfering, rounding to/>The single-phase region high temperature recrystallization grains are uniform to 1-3 mm through the step B2.
(2) The size obtained in the step (1) isPreserving the temperature of 950 ℃ for 170min, rolling on a rolling mill until the temperature reaches/>Hot material is rolled to/> afterreturning to the furnaceThree-phase after air-cooling injury repair.
(3) And (3) carrying out heat preservation and penetration on the bar blank treated in the step (2) at the temperature of 1060 ℃, discharging the bar blank, carrying out air cooling, and refining the grain size to be less than 100-500 mu m.
(4) The size after the treatment in the step (3) isPreserving the heat for 120min at 950 ℃, and carrying out first rolling on a rolling mill to obtain/>And (3) carrying out air cooling on the thin bars with the specification, and carrying out three-uniform division after wound repair.
(5) The size after the treatment in the step (4) isPreserving the heat at 1040 ℃ for 60min, and rolling for the second time on a rolling mill to obtain/>And (5) carrying out air cooling on the thin bars with the specification.
(6) For the treated product in step (5)Carrying out heat treatment on the thin bars with the specification, wherein the heat treatment system is that after the heat treatment is carried out for 3 hours at 960 ℃, the PAG is quenched by water (the PAG concentration is 10%), and then the heat treatment is carried out for 24 hours at 780 ℃ and then the air cooling is carried out.
For the step (6)Machining the thin bar material to obtain/>A bolt of diameter.
Comparative example 1
Comparative example 1 the preparation method of reference example 1 was different in that the temperature of the heat preservation was different in step (3).
In comparative example 1, the temperature of the incubation in step (3) was 1070 ℃.
Comparative example 2
Comparative example 2 the preparation method of example 1 was referred to, except that the temperature of the heat preservation was different in step (3).
In comparative example 2, the temperature of the incubation in step (3) was 1030 ℃.
Comparative example 3
Comparative example 3 the preparation method of example 1 was referred to, except that the rolling temperature was different in step (2).
In comparative example 3, the rolling temperature in step (2) was 1020 ℃.
Experimental example
The structure of the thin rod for the Ti2 ainb alloy bolt prepared in example 1 was tested, and the test results are shown in fig. 3 and 4. From the graph, the thin bar for the Ti2AlNb alloy bolt prepared by the invention has a lath structure with uniform structure.
The grain sizes (test standard reference GB/T6494-2017) and the respective volume fractions (using Image plus software) of examples 1 to 3 and comparative examples 1 to 3 were tested, and the test results are shown in Table 1.
Table 1 test results of the thin bars produced in the different examples and comparative examples
The bolts obtained by the processing of examples 1 to 3 and comparative examples 1 to 3 were tested for room temperature mechanical properties (test standards refer to GB/T228.1 and GB/T10128-2007), and the test results are shown in Table 2.
TABLE 2 results of Performance test of different bolts
From the test results, the Ti2AlNb alloy bolt prepared by adopting the thin rod disclosed by the invention has excellent room-temperature mechanical properties and meets the use requirements.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (11)
- The preparation method of the thin bar for the Ti2AlNb alloy bolt is characterized by comprising the following steps of:(a) Drawing and cogging a Ti2AlNb alloy cast ingot in the temperature range of a B2 single-phase region, and then rolling in the temperature range of a B2 plus O two-phase region to obtain a bar blank; the drawing and cogging is one-way cogging and direct drawing;(b) After the bar blank is insulated and thermally penetrated at 1040-1060 ℃, carrying out first rolling in the temperature range of a B2+O two-phase region, then carrying out second rolling in the B2+alpha 2 two-phase region, and then carrying out heat treatment to obtain a thin bar for the Ti2AlNb alloy bolt;In step (b), the heat treatment comprises: heat preservation is carried out for 3 to 4 hours at 950 to 980 ℃, and then quenching is carried out; then preserving heat for 24-26 h at 760-800 ℃ and then air cooling.
- 2. The method for producing a thin rod for a Ti2 ainb alloy bolt according to claim 1, wherein the temperature of the B2 single-phase region is 1150-1170 ℃.
- 3. The method for producing a thin rod for a Ti2 ainb alloy bolt according to claim 1, wherein the total deformation amount of the drawn wire is 65% to 85% in the drawn wire.
- 4. The method for producing a thin rod for a Ti2 ainb alloy bolt according to claim 1, wherein the drawing and cogging includes three drawing steps; the deformation of the first drawing is 35-55%, the deformation of the second drawing is 30-50%, and the deformation of the third drawing is 25-45%.
- 5. The method for producing a thin rod for a Ti2 ainb alloy bolt according to claim 1, characterized in that the temperature of the b2+o two-phase region is 920 to 950 ℃;and/or the temperature of the B2+Alpha 2 two-phase region is 1000-1040 ℃.
- 6. The method for producing a thin rod for a Ti2 ainb alloy bolt according to claim 1, wherein in the step (a), the total deformation amount of the rolling is 40% to 60%.
- 7. The method for producing a thin rod for a Ti2 ainb alloy bolt according to claim 1, characterized in that the deformation amount in the first rolling is 65% to 80%;and/or, in the second rolling, the deformation amount is 55-75%.
- 8. The method for producing a thin rod for a Ti2 ainb alloy bolt according to claim 1, wherein the quenched medium includes water and a quenching agent, and the quenching agent is a PAG water-soluble quenching agent.
- 9. The method for producing a thin rod for a Ti2 ainb alloy bolt according to claim 1, wherein the diameter of the thin rod is 30 to 50mm.
- 10. A thin rod for Ti2AlNb alloy bolt made by the method for producing a thin rod for Ti2AlNb alloy bolt of any one of claims 1-9.
- 11. The thin rod for Ti2 ainb alloy bolts of claim 10, wherein in said thin rod for Ti2 ainb alloy bolts, the volume fraction of α2 phase is 1% to 5%, and the size is 1 to 5 μm; the volume fraction of the O phase is 70% -85%, the primary O phase with the size of 1-5 μm accounts for 15% -30%, and the secondary O phase with the size smaller than 1 μm accounts for 55% -70%; the matrix B2 accounts for 10-30 percent.
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