CN112981174B - Preparation method of high-strength high-plasticity titanium alloy wire - Google Patents
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Abstract
The invention belongs to the field of titanium alloy material preparation, and discloses a preparation method of a high-strength high-plasticity titanium alloy wire, which comprises the following steps: forging the smelted titanium alloy ingot for multiple times; at TβRolling for many times at a temperature of 80-150 ℃ above the phase transition temperature; carrying out on-line heating at the temperature of 760-820 ℃, and then carrying out multi-pass hot drawing, wherein the temperature of the multi-pass hot drawing is sequentially reduced by 0-10 ℃ each time, and the pass deformation is 7-15%; peeling and stress relief annealing to obtain the titanium alloy wire. The invention prepares the titanium alloy wire with phi 3.0-phi 7.0mm, uniform tissue structure, high tensile strength at room temperature and good plasticity, and has simple production process and low production cost.
Description
Technical Field
The invention relates to the technical field of titanium alloy material preparation, in particular to a preparation method of a high-strength and high-plasticity titanium alloy wire.
Background
The titanium alloy has the characteristics of small density, high specific strength, excellent corrosion resistance, good fatigue strength, good fracture toughness and the like, so that the titanium alloy is widely applied to the field of aviation and aerospace fasteners. The titanium alloy with high specific strength is widely used in the aviation and aerospace industries, has very important effects on reducing the self weight of an aircraft and improving the load, and can generate great economic benefits on improving the driving force of the aircraft and the spacecraft, increasing the range, saving fuel, reducing the launching cost and the like. In modern aircraft construction, the amount of fasteners used is enormous, with hundreds of thousands of fasteners being used for an aircraft, and millions of fasteners being used. Titanium alloy fasteners have been largely replaced by alloy steel fasteners on military and civil aircraft in the united states, with the proportion of titanium alloy fasteners in threaded fasteners having been as high as over 90%.
At present, various global large aircrafts or high-speed aircrafts widely use high-strength titanium alloy as a structure or connecting piece material. The performance of the high-strength titanium alloy material becomes one of important indexes for evaluating the quality of airplane design and manufacture. The most commonly used titanium alloy fastener grades in China are TC4, TC16, TB2, TB3, TB5, TB8 and the like. The TC4 titanium alloy has good strength and fatigue property, stable process and low cost, and is the most widely used titanium alloy fastener material at present. However, TC4 has poor room temperature plasticity and hardenability, so that the requirements of cold heading and high strength cannot be met, and the hot forming processing cost is high. The room-temperature tensile strength Rm of the existing TC4 titanium alloy wire is more than or equal to 1100, the elongation A is more than or equal to 10 percent, and the urgent requirements of the aerospace field on high-strength and ultrahigh-strength fasteners cannot be met. The TC16 titanium alloy is mainly used for manufacturing aerospace fasteners, the required room temperature tensile strength Rm is more than or equal to 1030, the elongation A is more than or equal to 12%, cold forming can be realized in an annealing state, the forming cost of the fasteners can be reduced, but the strength and the fatigue performance of the TC16 titanium alloy are not as good as those of the TC4 titanium alloy. The TB2 and TB3 titanium alloys are beta type titanium alloys independently developed in China, and the required room temperature tensile strength Rm of the titanium alloys is more than or equal to 1100; the tensile strength Rm at room temperature required by the TB5 titanium alloy is more than or equal to 1000, the elongation A is more than or equal to 10 percent, the tensile strength Rm at room temperature required by the TB8 titanium alloy is more than or equal to 1250, and the elongation A is more than or equal to 8 percent. The alloy is mainly used for rivets, bolts, screws and the like of aviation and aerospace aircrafts, but the use strength of the materials is below 1300MPa, and the use requirements of ultrahigh-strength titanium alloys are not met.
The invention discloses a preparation method of a high-strength titanium alloy wire material in patent publication No. CN108570577A, wherein the final forming mode of the wire material is rolling deformation, and the existing rolling equipment can only produce the wire material with the diameter of phi of more than 8 mm. Meanwhile, because the near-beta type titanium alloy small-size wire has the processing characteristics of low deformation temperature, quick heat dissipation in the processing process, large deformation resistance and the like, the production method is not suitable for processing high-strength wires with the diameter less than 8 mm. The alloy wire produced by the method meets the requirement of ultrahigh strength, but the plasticity of the alloy wire needs to be further improved (the elongation is less than 10%).
With the further increase of the requirements of the aircraft structural member on high strength and light weight, a small-specification material with ultrahigh strength and high plasticity is urgently needed, and can be used for the new use requirement of the aircraft fastener after cold forming.
Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to provide a preparation method of a high-strength and high-plasticity titanium alloy wire, which is used for preparing phi 3.0-phi 7.0mmTi-1300F titanium alloy wires with uniform tissue structure, high tensile strength at room temperature and good plasticity, and has simple production process and low production cost.
In order to achieve the purpose, the invention is realized by adopting the following technical scheme.
A preparation method of a high-strength high-plasticity titanium alloy wire comprises the following components in percentage by mass: al: 3.5% -5.0%, Mo: 4.0% -6.0%, V: 2.5% -4.0%, Cr: 4.5-6.0%, Fe: 0.6 to 1.5 percent of Ti, and the balance of Ti; the preparation method comprises the following steps:
step 1, forging the smelted titanium alloy ingot for multiple times to obtain a rolling blank;
step 2, putting the rolling billet at TβRolling for many times at the temperature of 80-150 ℃ above the phase transition temperature to obtain a titanium alloy wire blank with phi 8-phi 12 mm;
step 3, heating the titanium alloy wire blank on line at the temperature of 760-820 ℃, and then carrying out multi-pass hot drawing, wherein the temperature of the multi-pass hot drawing is sequentially reduced, each time is reduced by 0-10 ℃, the wire drawing speed is 0.5-3 m/min, the pass deformation is 7-15%, and the accumulated deformation is 35-65%, so as to obtain a wire blank;
and 4, sequentially peeling and stress relief annealing the wire blank to obtain the titanium alloy wire.
The technical scheme of the invention has the characteristics and further improvements that:
further, the forging temperature of the multi-fire forging is 950-1150 ℃, the forging times are 2-4, and the forging temperatures are sequentially reduced according to the sequence of the forging fire times.
Furthermore, the multi-fire forging is a three-fire forging, specifically: the first forging temperature is 1150-1100 ℃, the second forging temperature is 1050-1000 ℃, and the third forging temperature is 980-950 ℃.
Further, the multiple rolling is performed by adopting a transverse rolling mill for 2-3 times of fire rolling, the temperature of the multiple rolling is sequentially reduced, and the heat preservation time of each rolling is calculated according to 0.5-1.0 min/mm.
Further, the multi-pass hot drawing is 6-8-pass hot drawing.
Furthermore, the multi-pass hot drawing is carried out by adopting a chain type wire drawing machine or a rotating disc type wire drawing machine, and is lubricated by using graphite emulsion.
Furthermore, the temperature of the last-but-one hot drawing in the multi-pass hot drawing is reduced by 5-10 ℃.
Further, the specification of the titanium alloy wire is phi 2.5-phi 8 mm.
Further, when the specification of the titanium alloy wire is smaller than phi 5mm, the method further comprises the step of sequentially carrying out multi-pass hot drawing and stress relief annealing on the titanium alloy wire obtained in the step 4 to obtain the small-specification titanium alloy wire.
Furthermore, the stress relief annealing is carried out at the temperature of 700-800 ℃ for 1-3h, and then air cooling is carried out.
Compared with the prior art, the invention has the beneficial effects that:
(1) compared with the traditional preparation process of the high-strength beta titanium alloy wire, the ingot forging and blank rolling processes are carried out in a beta single-phase region, repeated upsetting-drawing deformation is not needed, the deformation resistance in the processing process is small, the process is simple, and special large-scale equipment is not needed.
(2) Compared with the traditional high-strength beta titanium alloy wire forming preparation process, the invention adopts the hot drawing process to produce the wire, and can prepare the high-strength beta titanium alloy wire
The ultra-high strength wire material below the specification lays a foundation for ultra-high strength lightweight development of aircraft structural parts. Meanwhile, the hot drawing process of the invention adopts the beta phase transformation point to deform, thereby avoiding the problem that the plasticity of the material is reduced because the beta phase region is heated to coarsen crystal grains.
(3) The titanium alloy wire prepared by the invention has good tissue uniformity and high batch quality consistency; the titanium alloy wire is subjected to cold plastic processing to form a structural member shape, and then subjected to solid solution and aging heat treatment to obtain the structural member with the room-temperature tensile strength Rm of more than or equal to 1500MPa and the elongation A of more than or equal to 10 percent, so that the contradiction between strength and plasticity is solved, and the titanium alloy wire can still show good performance on small-size wires.
Drawings
The invention is described in further detail below with reference to the figures and specific embodiments.
FIG. 1 shows a sample prepared in example 1 of the present inventionTi-1300F titanium alloy wire
Scanning electron microscope photographs of the transverse microstructures;
FIG. 2 is a Ti-1300F titanium alloy wire prepared in example 3 of the present invention
Scanning electron micrograph of the transverse microstructure.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to examples, but it will be understood by those skilled in the art that the following examples are only illustrative of the present invention and should not be construed as limiting the scope of the present invention.
According to the embodiments of the invention, sponge titanium and intermediate alloy which meet the 0-grade requirement in the GB/T2524-2010 standard are used as raw materials, and alloy ingots with the phi of 650mm are prepared by three times of vacuum consumable melting. The cast ingot comprises the following components in percentage by mass: al: 4.0%, Mo: 5.0%, V: 3.0%, Cr: 4.8%, Fe: 1.2% and the balance Ti, the beta phase transition temperature was found to be 810. + -. 5 ℃.
Example 1
A preparation method of a high-strength high-plasticity titanium alloy wire comprises the following steps:
step 1, forging the smelted titanium alloy ingot for multiple times to obtain a rolling blank; the specific process comprises the following steps: heating titanium alloy ingots with phi of 650mm to 950-1150 ℃, calculating the heat preservation time according to 0.5-1.0 min/mm, and forging the titanium alloy ingots with phi of 180mm by a quick forging machine for 3 times to prepare rolled blanks with phi of 180 mm. Wherein the 1 st heating temperature is 1150 ℃, the heat preservation time is 390min, and the forging is carried out until phi is 500 mm; heating at 1050 deg.C for 300min for the second time, and forging to 280mm phi; heating the 3 rd time at 950 deg.C for 150min, and forging to phi 180 mm.
Step 2, putting the rolling billet at TβRolling for many times at the temperature of 80-150 ℃ above the phase transition temperature to obtain a titanium alloy wire blank with phi 8-phi 12 mm; the specific process comprises the following steps: will rollHeating the blank to TβRolling the steel wire blank into a wire blank for drawing with phi 12mm by a transverse rolling mill for 2 times at the temperature of 80-150 ℃ above the phase transition temperature and the heat preservation time of 0.5-1.0 min/mm; wherein, in the 1 st fire rolling, the rolled blank with phi 180mm is heated to 950 ℃, the heat preservation time is 120min, a phi 650mm transverse rolling mill is adopted to carry out 11-pass deformation rolling to obtain a phi 65mm titanium alloy bar, the pass deformation is 15.0-28.2%, and the total deformation is 89.76%; and during the 2 nd hot rolling, heating the blank with the diameter of 65mm to the temperature of 890 ℃, keeping the temperature for 60min, and rolling the blank by a transverse rolling mill with the diameter of 280mm through 13 passes to obtain a wire blank for drawing the titanium alloy with the diameter of 12mm, wherein the pass deformation is 16.5-26.2%, and the total deformation is 96.59%.
Step 3, hot drawing: heating a titanium alloy wire blank with the diameter of phi 12mm to 790 ℃ in a tubular heating furnace on line, and drawing the titanium alloy wire blank into a semi-finished product of the titanium alloy wire with the diameter of phi 8.0mm through 8 die times, wherein the temperature of the 5 th die time and the 7 th die time is respectively reduced by 5 ℃ for heating, and the deformation of each die time is 8.1-11.4%; the total deformation is 55.56%, the drawing speed is 0.5-3 m/min, and the blank is prepared into a phi 8.0mm wire blank.
And 4, sequentially peeling and stress relief annealing the wire blank to obtain the titanium alloy wire.
The specific process comprises the following steps: removing surface oxide skin and defects of a phi 8.0mm wire semi-finished product by adopting a Pb6/20 combined skinning machine, wherein the skinning amount is 0.5mm, and simultaneously cutting the blank into 2000-3000 mm long straight strips; and (3) performing stress relief annealing on the straight wire blank with the diameter of 7.5mm in a box-type resistance furnace at the annealing temperature of 780 ℃, preserving the heat for 1.5 hours, and then cooling in air to obtain the alloy.
Straightening and polishing the titanium alloy wire prepared by the invention to obtain a finished product; wherein, straightening: straightening by adopting a seven-roller straightening machine, wherein the straightness of the straightened wire is less than or equal to 2 mm/m; polishing: and (3) performing centerless grinding and polishing treatment on the straightened wire, wherein the polishing process comprises coarse grinding and fine grinding, the grinding amount of each pass is 0.05mm and 0.03mm respectively, and the finished wire with the surface roughness Ra of less than or equal to 1.6 mu m, the ovality of less than or equal to 0.15mm and the specification of phi 7.0mm is prepared.
The titanium alloy wire with the diameter of 7.0mm produced by the embodiment and a product thereof after solid solution and aging heat treatmentRespectively detecting the tensile strength Rm and the yield strength R at the room temperature of 25 DEG Cp0.2The plastic elongation A and the reduction of area Z, the test results are shown in Table 1.
Wherein, the solid solution and aging heat treatment system is as follows: at TβHeating at-10 deg.C, keeping the temperature for 120min, air cooling, solution treating, and aging at 540 deg.C for 12 hr.
TABLE 1 Room temperature mechanical Properties of 7.0mm wire prepared in EXAMPLE 1 of the present invention
Example 2
A preparation method of a high-strength high-plasticity titanium alloy wire comprises the following steps:
step 1, forging the smelted titanium alloy ingot for multiple times to obtain a rolling blank; the specific process comprises the following steps: heating titanium alloy ingots with phi of 650mm to 950-1150 ℃, calculating the heat preservation time according to 0.5-1.0 min/mm, and forging the titanium alloy ingots with phi of 180mm by a quick forging machine for 3 times to prepare rolled blanks with phi of 180 mm. Wherein the 1 st heating temperature is 1150 ℃, the heat preservation time is 390min, and the forging is carried out until phi is 500 mm; heating at 1050 deg.C for the second time, holding for 300min, and forging to phi 280 mm; heating the 3 rd time at 950 deg.C for 150min, and forging to phi 180 mm.
Step 2, putting the rolling billet at TβRolling for many times at the temperature of 80-150 ℃ above the phase transition temperature to obtain a titanium alloy wire blank with phi 8-phi 12 mm; the specific process comprises the following steps: heating the rolled stock to TβRolling the steel wire blank into a drawing wire blank with phi 10mm by a transverse rolling mill for 2 times at the temperature of 80-150 ℃ above the phase transition temperature and the heat preservation time of 0.5-1.0 min/mm; wherein, in the 1 st fire rolling, the rolled blank with phi 180mm is heated to 950 ℃, the heat preservation time is 120min, a phi 650mm transverse rolling mill is adopted to carry out 11-pass deformation rolling to obtain a phi 65mm titanium alloy bar, the pass deformation is 15.0-28.2%, and the total deformation is 89.76%; heating the blank with the diameter of 65mm to 890 ℃ during the 2 nd fire rolling, and preserving heatThe time is 60min, a phi 280mm transverse rolling mill is adopted to roll the titanium alloy into a phi 10mm wire blank for drawing through 15 passes, the pass deformation is 16.5-28.9%, and the total deformation is 97.6%.
Step 3, hot drawing: heating a wire blank for drawing the phi 10mm titanium alloy to 790 ℃ in a tubular heating furnace on line, and drawing the wire blank into a phi 6.2mm wire semi-finished product by a chain type wire drawing machine for 7 times, wherein the 3 rd time and the 6 th time are respectively cooled to 5 ℃ for heating, and the deformation of each time is 7.5-13.8%; the total deformation is 61.6%, the drawing speed is 0.5-3 m/min, and the blank is prepared into a phi 6.2mm wire blank.
And 4, sequentially peeling and stress relief annealing the wire blank to obtain the titanium alloy wire.
The specific process comprises the following steps: removing surface oxide skin and defects of a phi 6.2mm wire semi-finished product by adopting a Pb6/20 combined skinning machine, wherein the skinning amount is 0.4mm, and meanwhile, the skinning amount is interrupted to 2000-3000 mm long straight strip blanks; then, stress relief annealing is carried out on the straight wire blank with the diameter of 5.8mm in a box-type resistance furnace, the annealing temperature is 760 ℃, the temperature is kept for 1.25 hours, and then air cooling is carried out, thus obtaining the alloy.
Straightening and polishing the titanium alloy wire prepared by the invention to obtain a finished product; wherein, straightening: straightening by adopting a seven-roller straightening machine, wherein the straightness of the straightened wire is less than or equal to 2 mm/m; polishing: and (3) performing centerless grinding and polishing treatment on the straightened wire, wherein the polishing process comprises coarse grinding and fine grinding, the grinding amount of each pass is 0.05mm and 0.03mm respectively, and a finished wire with the surface roughness Ra of less than or equal to 1.6 mu m, the ovality of less than or equal to 0.10mm and the specification of phi 5.5mm is prepared.
The titanium alloy wire with the diameter of 5.5mm produced in the embodiment and the product thereof after solid solution and aging heat treatment are respectively tested for tensile strength Rm and yield strength R at the room temperature of 25 DEG CP0.2Plastic elongation A and reduction of area Z, the results of which are shown in Table 2.
Wherein, the solid solution and aging heat treatment system is as follows: at TβHeating at-25 deg.C, keeping the temperature for 80 min, air-cooling, solid-solution treating, and aging at 500 deg.C for 10 hr.
TABLE 2 Room temperature mechanical Properties of phi 5.5mm wire prepared in EXAMPLE 2 of the present invention
Example 3
A preparation method of a high-strength high-plasticity titanium alloy wire comprises the following steps:
step 1, forging the smelted titanium alloy ingot for multiple times to obtain a rolling blank; the specific process comprises the following steps: heating titanium alloy ingots with phi of 650mm to 950-1150 ℃, calculating the heat preservation time according to 0.5-1.0 min/mm, and forging the titanium alloy ingots with phi of 180mm by a quick forging machine for 3 times to prepare rolled blanks with phi of 180 mm. Wherein the 1 st heating temperature is 1150 ℃, the heat preservation time is 390min, and the forging is carried out until phi is 500 mm; heating at 1050 deg.C for the second time, holding for 300min, and forging to phi 280 mm; heating the 3 rd time at 950 deg.C for 150min, and forging to phi 180 mm.
Step 2, putting the rolling billet at TβRolling for many times at the temperature of 80-150 ℃ above the phase transition temperature to obtain a titanium alloy wire blank with phi 8-phi 12 mm; the specific process comprises the following steps: heating the rolled stock to TβRolling the titanium alloy disc round blank into a titanium alloy disc round blank with the diameter of 8mm by a transverse rolling mill for 2 times at the temperature of 80-150 ℃ above the phase transition temperature and the heat preservation time of 0.5-1.0 min/mm; wherein, in the 1 st fire rolling, the rolled blank with the diameter of 180mm is heated to 950 ℃, the heat preservation time is 120min, a transverse rolling mill with the diameter of 650mm is adopted to perform 11-pass deformation rolling to a titanium alloy bar with the diameter of 65mm, the pass deformation is 15.0-28.2%, and the total deformation is 89.76%; heating the blank with the diameter of 65mm to 890 ℃ during the 2 nd fire rolling, keeping the temperature for 60min, and rolling the blank into a titanium alloy wire rod blank with the diameter of 8.0mm by adopting a transverse rolling mill with the diameter of 280mm through 17 passes, wherein the pass deformation is 16.5-29.1%, and the total deformation is 98.49%;
step 3, hot drawing: heating the titanium alloy wire rod blank with the diameter of 8.0mm to 790 ℃ in a tubular heating furnace on line, drawing the titanium alloy wire rod blank with the diameter of 5.0mm into the titanium alloy wire rod blank with the diameter of 0.5mm by a rotating disc type wire drawing machine for 3 times, wherein the deformation of each time is 15.9-17.4%, the total deformation is 60.9%, and the drawing speed is 0.5-3 m/min;
and 4, sequentially peeling and stress relief annealing the wire blank to obtain the titanium alloy wire.
The specific process comprises the following steps: removing surface oxide skin and defects of a titanium alloy disc blank with the diameter of phi 5.0mm by a peeling die, wherein the peeling amount is 0.2mm, and manually checking and polishing the defects of the blank; and (3) performing stress relief annealing on the peeled titanium alloy disc round blank with the diameter of 4.8mm in a box type resistance furnace, wherein the annealing temperature is 760 ℃, and performing heat preservation for 1.5 hours and then performing air cooling.
And (3) carrying out hot drawing and stress relief annealing on the phi 4.8mm titanium alloy wire obtained in the step (4), specifically: heating a titanium alloy wire with the diameter of 4.8mm to 770 ℃ in a tubular heating furnace on line, and drawing the titanium alloy wire into a titanium alloy wire disc blank with the diameter of 3.3mm by a rotary disc type wire drawing machine for 5 die times, wherein the deformation of each die is 9.5-16.0%; the total deformation is 52.7%, the drawing speed is 0.5-3 m/min, and the titanium alloy wire rod blank with the diameter of 3.3mm is prepared; and (3) performing stress relief annealing on the titanium alloy disc blank with the diameter of 3.3mm in a box type resistance furnace, wherein the annealing temperature is 780 ℃, and performing air cooling after heat preservation for 1.0 hour to obtain the titanium alloy wire with the diameter of 3.3 mm.
Straightening and polishing the titanium alloy wire prepared by the invention to obtain a finished product; wherein, straightening: straightening and interrupting the titanium alloy wire on a multi-die straightening machine, wherein the straightness of the straightened wire is less than or equal to 2mm/m, and the length of the straightened wire is 2000 mm.
Polishing: the method comprises the following steps of carrying out centerless grinding and polishing treatment on straight strips of titanium alloy wire materials on a centerless grinding machine, wherein the polishing process comprises coarse grinding and fine grinding, the grinding amount of each pass is 0.05mm and 0.03mm respectively, and the prepared finished wire material with the surface roughness Ra of less than or equal to 1.6 mu m and the ovality of less than or equal to 0.05-0.15mm is obtained, so that the finished wire material with the specification of phi 3.0mm is obtained.
The titanium alloy wire with the diameter of 3.0mm produced in the embodiment and the product thereof after solid solution and aging heat treatment are respectively tested for tensile strength Rm and yield strength R at the room temperature of 25 DEG Cp0.2Plastic elongation A andthe reduction of area Z, the test results are shown in Table 3.
Wherein, the solid solution and aging heat treatment system is as follows: at TβHeating at minus 45 ℃, keeping the temperature for 40 minutes, then carrying out air cooling solution treatment, and then carrying out ageing treatment at 485 ℃ for 10 hours.
TABLE 3 Room temperature mechanical Properties of phi 3.0mm wire prepared in EXAMPLE 3 of the present invention
The microscopic morphology of the products prepared in the embodiments 1 and 3 of the present invention is observed by using a scanning microscope, and the results are shown in fig. 1 and 2, and it can be seen from fig. 1 and 2 that the grain size of the product prepared by the present invention can reach about 1 μm, and the uniformity of the microstructure inside the product is good.
As can be seen from tables 1-3, after the product prepared by the invention is subjected to solid solution and aging heat treatment, the room-temperature tensile strength Rm is more than or equal to 1500MPa, the elongation A is more than or equal to 10%, and the product achieves ultrahigh strength and has good plasticity. Even if the product specification is 3.0mm, the high mechanical property can still be maintained. The product of the invention retains certain cold plastic processing deformation capability, and after the structural member is formed by cold plastic processing deformation, the titanium alloy structural member with high strength and high plasticity can be obtained by conventional solid solution and aging heat treatment, and the titanium alloy structural member has good application prospect in structural member parts in the fields of aviation, aerospace, ships, ocean engineering, automobiles and the like.
The tissue of the wire produced by the invention is uniform and fine alpha + beta two-phase region tissue, the grain size can reach about 1 mu m of fine crystalline tissue, and the material can have higher strength and keep good plasticity.
The invention adopts the hot drawing process to produce the wire material, and can meet the requirement
Market demand for ultra-high strength wire materials below specification; and the blank can be ensured to have enough beta phase region deformation without upsetting and drawing deformation of multiple fire timesThereby breaking the as-cast structure and achieving the purpose of refining grains.
The invention obtains the phi 3.0-phi 7.0mmTi-1300F titanium alloy wire with high room temperature tensile strength and good plasticity through the design of the blank processing technology and the finished product processing technology. The method solves the production problem of domestic ultrahigh-strength high-plasticity titanium alloy wires, has simple process, high production efficiency and low process cost, and can produce the ultrahigh-strength high-plasticity titanium alloy wires with excellent tissue and performance.
Although the present invention has been described in detail in this specification with reference to specific embodiments and illustrative embodiments, it will be apparent to those skilled in the art that modifications and improvements can be made thereto based on the present invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (10)
1. A preparation method of a high-strength high-plasticity titanium alloy wire comprises the following components in percentage by mass: al: 3.5% -5.0%, Mo: 4.0% -6.0%, V: 2.5% -4.0%, Cr: 4.5% -6.0%, Fe: 0.6% -1.5%, the balance being Ti, characterized in that the preparation method comprises the following steps:
step 1, forging the smelted titanium alloy ingot for multiple times to obtain a rolling blank;
step 2, putting the rolling billet at TβRolling for many times at the temperature of 80-150 ℃ above the phase transition temperature to obtain a titanium alloy wire blank with phi 8-phi 12 mm;
step 3, heating the titanium alloy wire blank on line at the temperature of 760-820 ℃, and then carrying out multi-pass hot drawing, wherein the temperature of the multi-pass hot drawing is sequentially reduced, each time is reduced by 0-10 ℃, the wire drawing speed is 0.5-3 m/min, the pass deformation is 7-15%, and the accumulated deformation is 35-65%, so as to obtain a wire blank;
and 4, sequentially peeling and stress relief annealing the wire blank to obtain the titanium alloy wire.
2. The method for preparing the high-strength high-plasticity titanium alloy wire material according to claim 1, wherein the forging temperature of the multi-fire forging is 950-1150 ℃, the forging times are 2-4, and the forging temperatures are sequentially reduced according to the sequence of the forging times.
3. The method for preparing the high-strength high-plasticity titanium alloy wire according to claim 2, wherein the multi-fire forging is three-fire forging, and specifically comprises the following steps: the first forging temperature is 1150-1100 ℃, the second forging temperature is 1050-1000 ℃, and the third forging temperature is 980-950 ℃.
4. The method for preparing the high-strength high-plasticity titanium alloy wire according to claim 1, wherein the multiple rolling is performed by 2-3 times of heating by using a horizontal rolling mill, the temperature of the multiple rolling is sequentially reduced, and the heat preservation time of each rolling is calculated according to 0.5-1.0 min/mm.
5. The method for preparing the high-strength high-plasticity titanium alloy wire material according to claim 1, wherein the multi-pass hot drawing is 6-8-pass hot drawing.
6. The method for preparing the high-strength high-plasticity titanium alloy wire according to claim 1, wherein the multi-pass hot drawing is performed by a chain type wire drawing machine or a rotating disc type wire drawing machine, and is lubricated by graphite emulsion.
7. The method for preparing the high-strength high-plasticity titanium alloy wire material according to claim 5, wherein the temperature of the penultimate hot drawing in the multi-pass hot drawing is reduced by 5-10 ℃.
8. The method for preparing the high-strength high-plasticity titanium alloy wire according to claim 1, wherein the specification of the titanium alloy wire is phi 2.5-phi 8 mm.
9. The method for preparing the high-strength high-plasticity titanium alloy wire according to claim 8, wherein when the specification of the titanium alloy wire is smaller than phi 5mm, the method further comprises the step of sequentially carrying out multi-pass hot drawing and stress relief annealing on the titanium alloy wire obtained in the step 4 to obtain the small-specification titanium alloy wire.
10. The method for preparing the high-strength high-plasticity titanium alloy wire according to claim 1 or 8, wherein the stress relief annealing is performed at 700-800 ℃ for 1-3h and then air cooling is performed.
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| CN113523013B (en) * | 2021-08-19 | 2022-04-08 | 索罗曼(常州)合金新材料有限公司 | Production process of thick-wire-diameter titanium alloy wire |
| CN114161028B (en) * | 2021-12-20 | 2023-03-24 | 西北有色金属研究院 | Processing method for improving performance of titanium alloy welding wire |
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| CN114657417B (en) * | 2022-05-07 | 2022-12-23 | 北京航空航天大学 | High-strength plastic titanium alloy suitable for cold deformation processing and preparation method thereof |
| CN115255021B (en) * | 2022-09-29 | 2023-01-24 | 西安赛特思迈钛业有限公司 | Large-single-weight TC4 titanium disc round wire for aerospace fastener and preparation method thereof |
| CN116727587B (en) * | 2023-08-11 | 2023-10-27 | 成都先进金属材料产业技术研究院股份有限公司 | TB5 titanium alloy wire and preparation method thereof |
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