CN115255021B - Large-single-weight TC4 titanium disc round wire for aerospace fastener and preparation method thereof - Google Patents

Large-single-weight TC4 titanium disc round wire for aerospace fastener and preparation method thereof Download PDF

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CN115255021B
CN115255021B CN202211197569.2A CN202211197569A CN115255021B CN 115255021 B CN115255021 B CN 115255021B CN 202211197569 A CN202211197569 A CN 202211197569A CN 115255021 B CN115255021 B CN 115255021B
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phi
weight
titanium
wire
coiled
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CN115255021A (en
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杨晓康
魏芬绒
杜晨
罗斌莉
双翼翔
王海
陈曦
杨欢
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Xi'an Saite Simai Titanium Industry Co ltd
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Xi'an Saite Simai Titanium Industry Co ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/04—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of bars or wire
    • B21C37/045—Manufacture of wire or bars with particular section or properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/04—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of bars or wire
    • B21C37/047—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of bars or wire of fine wires
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C1/00—Making non-ferrous alloys
    • C22C1/02—Making non-ferrous alloys by melting
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C14/00—Alloys based on titanium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/16—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of other metals or alloys based thereon
    • C22F1/18—High-melting or refractory metals or alloys based thereon
    • C22F1/183—High-melting or refractory metals or alloys based thereon of titanium or alloys based thereon

Abstract

The invention discloses a large-piece-weight TC4 titanium disc round wire for an aerospace fastener and a preparation method thereof, wherein the preparation method comprises the following steps: step 1, preparing a cast ingot; step 2, forging and drawing to form a round billet; step 3, rolling into a bar; step 4, heat treatment; step 5, coarse and fine drawing; step 6, heat treatment; and 7, sizing and polishing the coiled wire blank subjected to the heat treatment in the step 6, and then carrying out chemical coating treatment on the coiled wire blank to finally obtain the large-single-weight TC4 titanium coiled wire material for the aerospace fastener. The method solves the problems of poor tissue, performance and tolerance consistency and small coil weight of the conventional TC4 titanium coil wire.

Description

Large-single-weight TC4 titanium disc round wire for aerospace fastener and preparation method thereof
Technical Field
The invention belongs to the technical field of metal material preparation, and relates to a large-single-weight TC4 titanium disc round wire for aerospace fasteners and a preparation method thereof.
Background
The TC4 titanium alloy is TC4 titanium alloy, and has the characteristics of low density, high specific strength, good marine environment corrosion resistance, no magnetism, sound transmission, shock resistance, good machinability and the like, so that the tolerance, reliability and effectiveness can be effectively improved, the maintenance and repair cost is reduced, the weight is reduced, and the load is increased. The TC4 titanium fastener can improve the strength of the joint, improve the fatigue strength and the sealing performance of the structural part and reduce the weight of the structure. Due to the weight reduction requirement of the airplane design, the structural materials mostly adopt light high-strength materials such as TC4 titanium alloy, aluminum alloy, composite materials and the like. TC4 titanium alloy fasteners are used for mechanical joining of these materials. Besides the weight reduction effect of the TC4 titanium alloy fastener, the TC4 titanium alloy fastener also has very good galvanic corrosion resistance of composite materials, so that the TC4 titanium alloy fastener is the best choice for connecting the structures. Particularly, nowadays, the titanium content ratio for the airplane is improved so as to improve the performance of the airplane, and a large amount of TC4 titanium alloy fasteners are inevitably used.
In the past, TC4 titanium alloy wires cannot be straightened on line by upsetting equipment in fastener production plants, straight wires are always adopted in domestic TC4 titanium alloy fastener production, the material utilization rate and the production efficiency are low, and the upset fastener has the hidden trouble of poor quality consistency; at present, equipment of a fastener production plant is updated, continuous upsetting can be realized by adopting coiled wire materials, the material utilization rate can be improved by more than 20%, and the production efficiency can be improved by 5-10 times.
The TC4 titanium disc round wire material produced in China at present has poor consistency of structure, performance and tolerance and small disc weight, can not completely meet the standard requirements of aerospace fastener manufacturers, influences the size consistency of aerospace fasteners and the continuous upsetting production of the aerospace fasteners, and can not meet the requirement of mass production of the aerospace fasteners.
Disclosure of Invention
The invention aims to provide a large-piece-weight TC4 titanium coiled wire for an aerospace fastener and a preparation method thereof, and aims to solve the problems of poor consistency of structure, performance and tolerance and small coil weight of the conventional TC4 titanium coiled wire.
The technical scheme adopted by the invention is that the preparation method of the large-single-weight TC4 titanium disc round wire for the aerospace fastener is implemented according to the following steps:
step 1, preparing an ingot: titanium sponge, aluminum-vanadium alloy and aluminum beans are used as raw materials, and the mass percentages of the elements are as follows: al 6.0% -6.5%, V4.0% -4.5%, O0.15% -0.18%, fe 0.16% -0.25% and Ti in balance, respectively weighing the above raw materials, mixing, pressing to obtain electrode blocks, and smelting the electrode blocks for three times by using a vacuum consumable arc smelting furnace to obtain ingots;
step 2, forging and drawing to obtain a round billet: performing cogging forging, drawing and circle throwing on the ingot prepared in the step 1 by using a resistance furnace to prepare a round billet with the diameter of phi 120-phi 150 mm;
step 3, rolling into a bar: carrying out continuous large-deformation rolling on the round billet prepared in the step 2 to prepare a coiled rod billet with the diameter of phi 8-phi 15 mm;
step 4, heat treatment: performing stress relief annealing treatment on the coiled rod blank prepared in the step 3;
step 5, coarse and fine drawing: processing the rod blank of the coil processed in the step 4 through a round sizing and peeling procedure, then sequentially performing rough drawing and fine drawing, and finally processing the rod blank of the coil to a wire coil blank with the diameter of phi 2.5-phi 7.5 mm;
step 6, heat treatment: carrying out finished product annealing treatment on the coiled wire blank prepared in the step 5;
and 7, sizing and polishing the coiled wire blank subjected to the heat treatment in the step 6 until the surface of the coiled wire blank is bright, and then carrying out chemical coating treatment on the coiled wire blank to finally obtain the large-single-weight TC4 titanium coiled wire material for the aerospace fastener.
Further, in the step 3, an electric furnace is adopted for heating in the continuous large-deformation rolling process, the heating temperature is 900-950 ℃, the heat preservation time is 60-90min, and the final rolling temperature is 700-850 ℃.
Further, the rough drawing process in step 5 specifically comprises: drawing and processing the coiled rod blank processed in the step 4 to form a coiled wire blank with the diameter of phi 6-phi 10 mm;
wherein the drawing temperature in the rough drawing process is 600 to 850 ℃, the drawing speed is 2 to 15m/min, the single pass deformation is 10 to 40 percent, and the total deformation is 40 to 80 percent.
Further, the fine drawing process of step 5 specifically comprises: drawing the coiled wire blank subjected to the rough drawing treatment to form a coiled wire blank with the diameter of phi 2.5-phi 7.5mm through a fixed die;
wherein the drawing temperature in the fine drawing process is 600-800 ℃, the drawing speed is 2-15m/min, the single-pass deformation is 5-20%, and the total deformation is 30-60%.
Further, the large-single-weight TC4 titanium disc round wire for the aerospace fastener, which is prepared in the step 7, has the diameter of phi 2-phi 7mm.
The second technical scheme adopted by the invention is that the large-single-weight TC4 titanium wire rod for the aerospace fastener is prepared by adopting a preparation method of the large-single-weight TC4 titanium wire rod for the aerospace fastener, wherein the mass percentage ranges of all elements are as follows: 6.0 to 6.5 percent of Al, 4.0 to 4.5 percent of V, 0.15 to 0.18 percent of O, 0.16 to 0.25 percent of Fe and the balance of Ti.
The invention has the beneficial effects that: the invention adopts continuous large-deformation rolling to prepare the coiled rod blank, and can improve the problem of poor tissue property of the prepared coiled wire material and realize the requirements of tolerance, performance and microstructure of the coiled wire material product by adding two steps of procedures of rough drawing and fine drawing and setting specific process parameters in the processes of heat treatment and rough and fine drawing. The coil weight of the large-single-weight TC4 titanium coil wire for the aerospace fastener is not less than 100kg, the tolerance is not more than 0.03mm, the tensile strength is not less than 900-1100 MPa, the elongation is not less than 15%, the solid solution state tensile strength is not less than 1150MPa, the elongation is not less than 10%, the shear strength is 700MPa, the transverse microstructure is A1-A3 grade, and the longitudinal microstructure is AA1-AA3 grade.
Drawings
FIG. 1 is a graph of dimensional consistency data for large single weight TC4 titanium disc round wire rods for aerospace fasteners of diameter phi 2.0mm in example 1 of the present invention;
FIG. 2 is a transverse microstructure view (200X) of a large single-weight TC4 titanium disc round wire with a diameter of phi 2.0mm for an aerospace fastener in example 1 of the invention;
FIG. 3 is a longitudinal microstructure view (200X) of a large single-weight TC4 titanium disc round wire with a diameter of phi 2.0mm for an aerospace fastener in example 1 of the invention;
FIG. 4 is a graph of data on the dimensional consistency of large single-weight TC4 titanium disk round wires with a diameter of 7.0mm for aerospace fasteners in example 2 of the invention;
FIG. 5 is a transverse microstructure view (200X) of a large single weight TC4 titanium disk round wire rod for an aerospace fastener with a diameter of 7.0mm in example 2 of the present invention;
FIG. 6 is a longitudinal microstructure view (200X) of a large single weight TC4 titanium disk round wire rod for an aerospace fastener having a diameter of 7.0mm in example 2 of the present invention;
FIG. 7 is a graph of dimensional consistency data for large single weight TC4 titanium disk round wire rods for aerospace fasteners having a diameter of φ 5.0mm in example 3 of the invention;
FIG. 8 is a transverse microstructure view (200X) of a large single weight TC4 titanium disk round wire rod for an aerospace fastener having a diameter of φ 5.0mm in example 3 of the present invention;
FIG. 9 is a longitudinal microstructure view (200X) of a large single weight TC4 titanium disk round wire for an aerospace fastener having a diameter of φ 5.0mm in example 3 of the invention.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
The invention provides a preparation method of a large-single-weight TC4 titanium coiled wire for an aerospace fastener, which is implemented according to the following steps:
step 1, preparing an ingot: the sponge titanium, the aluminum vanadium alloy and the aluminum beans are used as raw materials, and the mass percentages of the elements are as follows: 6.0-6.5% of Al, 4.0-4.5% of V, 0.15-0.18% of O, 0.16-0.25% of Fe and the balance of Ti, respectively weighing the raw materials, mixing and pressing to prepare an electrode block, pressing the mixed raw materials into the electrode block by using an oil press, and smelting the electrode block for three times by using a vacuum consumable arc smelting furnace to prepare an ingot, wherein the diameter of the ingot can be phi 620mm.
Step 2, forging and drawing to obtain a round billet: and (3) performing cogging forging, drawing and circle throwing on the ingot prepared in the step (1) by using a resistance furnace to prepare a round billet with the diameter of phi 120-phi 150mm, wherein the length of the round billet can be 3000mm generally.
Step 3, rolling into a coiled bar blank: and (3) carrying out continuous large-deformation rolling on the round billet prepared in the step (2) to prepare a coiled rod billet with the diameter of phi 8-phi 15 mm.
And 4, performing stress relief annealing treatment on the coiled rod blank prepared in the step 3, wherein the annealing temperature is 650 to 850 ℃, and the annealing time is 1 to 2h.
Step 5, coarse and fine drawing: and (4) firstly carrying out the round sizing and peeling procedure on the coiled rod blank treated in the step (4), then carrying out rough drawing treatment and fine drawing treatment in sequence, and finally processing the coiled rod blank into a coiled wire blank with the diameter of phi 2.5-phi 7.5 mm.
Step 6, heat treatment: and (5) annealing the finished product of the coiled wire blank prepared in the step (5), wherein the annealing temperature is 650-850 ℃, and the annealing time is 0.5-2h.
And 7, sizing and polishing the coiled wire blank subjected to the heat treatment in the step 6 until the surface of the coiled wire blank is bright, and then carrying out chemical coating treatment on the coiled wire blank to finally prepare the large-single-weight TC4 titanium coiled round wire material for the aerospace fastener, wherein the diameter of the wire material is phi 2-phi 7mm. The wire rod is a TC4 titanium wire rod with large single weight and uniform and consistent structure, mechanical property and size.
In some embodiments, in the step 3, the continuous large deformation rolling process is carried out by heating in an electric furnace at the heating temperature of 900-950 ℃ for 60-90min, and the final rolling temperature is 700-850 ℃, so that the diameter of the round billet is reduced and the coiled rod billet with the diameter of 8-15 mm is formed through the rolling process of the step.
In some embodiments, the rough drawing process in step 5 specifically includes:
the coiled rod blank treated in the step 4 is subjected to a round sizing and peeling procedure, and then is subjected to drawing processing to form a coiled wire blank with the diameter of phi 6-phi 10 mm; the rough drawing process adopts a tubular heating furnace, the drawing temperature in the rough drawing process is 600-850 ℃, the drawing speed is 2-15m/min, the single-pass deformation is 10-40%, and the total deformation is 40-80%. And (3) after the rough drawing is finished, performing an intermediate annealing process, wherein the heating temperature is 700-850 ℃, and the heat preservation time is 0.5-2h.
In some embodiments, the fine drawing process in step 5 is specifically:
drawing the coiled wire blank subjected to the rough drawing treatment to form a coiled wire blank with the diameter of phi 2.5-phi 7.5mm through a fixed die; the finish drawing process adopts a tubular heating furnace, the drawing temperature in the finish drawing process is 600-800 ℃, the drawing speed is 2-15m/min, the single-pass deformation is 5-20%, and the total deformation is 30-60%. And after finishing the fine drawing, performing an intermediate annealing process, wherein the heating temperature is 700 to 850 ℃, and the heat preservation time is 0.5 to 2h.
In some embodiments, the large single-weight TC4 titanium disc round wire for the aerospace fastener prepared after the treatment of the step 7 has a diameter of phi 2-phi 7mm.
The invention also provides a large single weight TC4 titanium disc round wire material for the aerospace fastener, which is prepared by adopting the preparation method of the large single weight TC4 titanium disc round wire material for the aerospace fastener, wherein the mass percentage ranges of the elements are as follows: 6.0 to 6.5 percent of Al, 4.0 to 4.5 percent of V, 0.15 to 0.18 percent of O, 0.16 to 0.25 percent of Fe and the balance of Ti.
According to the invention, the transverse tissue uniformity of the large single-weight coil rod blank is controlled by setting parameters such as drawing temperature, pass deformation, drawing speed, total deformation and intermediate annealing in the rough drawing process, so that the large single-weight coil rod blank with the diameter of phi 7-phi 10mm achieves a uniform two-phase equiaxial transverse microstructure.
According to the invention, the longitudinal structure, performance and surface quality consistency of the large single-weight wire product are controlled by setting parameters such as drawing temperature, pass deformation, total drawing speed deformation, finished product annealing and the like in the finish drawing process, so that the finally prepared large single-weight coiled wire with the diameter of phi 2-phi 7mm can reach the uniform AA1-AA3 longitudinal microstructure, and the mechanical property and the surface quality are stable and consistent.
In the prior art, a round billet is usually rolled in a transverse row manner, but the defect is that the disc weight is small, and a large single-weight disc wire material cannot be prepared. The method of continuously rolling round billets with large deformation has the advantage of large disk weight, but has the defect of poor structural uniformity, so the method of continuously rolling round billets with large deformation is not common in the titanium material industry. In the prior art, two processes of rough drawing and finish drawing are not set for the production of wire rods in a wire rod in a coil form, the wire rods are usually produced by adopting the same drawing technological parameter and mode until the specification of finished products, and the processing method cannot meet the requirements of continuous drawing production and finished products of large single-weight wire rods in a coil form. Therefore, the invention adopts continuous large-deformation rolling to prepare the coiled bar blank, and can improve the problem of poor structure of the prepared coiled wire material by adding two steps of rough drawing and fine drawing and setting specific process parameters in the processes of heat treatment and rough and fine drawing, and realize the requirements of tolerance, performance and microstructure of the coiled wire material product.
The coil weight of the large-single-weight TC4 titanium coil wire for the aerospace fastener is not less than 100kg, the tolerance is not more than 0.03mm, the tensile strength is not less than 900-1100 MPa, the elongation is not less than 15%, the solid solution state tensile strength is not less than 1150MPa, the elongation is not less than 10%, the shear strength is 700MPa, the transverse microstructure is A1-A3 grade, and the longitudinal microstructure is AA1-AA3 grade. According to the large-single-weight TC4 titanium wire rod for the aerospace fastener, disclosed by the invention, the component ranges of all key elements Al, V, fe and O of an ingot are strictly controlled, and a specific processing and preparation process route and all process parameter settings are strictly controlled, so that the prepared large-single-weight TC4 titanium wire rod for the aerospace fastener has the characteristics of large disk weight, high precision, uniform and consistent structure and performance, and can be widely applied to various TC4 titanium aerospace fasteners such as aerospace and the like.
Example 1
Titanium sponge, aluminum-vanadium alloy and aluminum beans are used as raw materials, and the mass percentages of the elements are as follows: al 6.0%, V4.0%, O0.15%, fe 0.16% and Ti 89.69%, respectively weighing the above raw materials, mixing, pressing the mixed raw materials into electrode blocks by using a 3500t oil press, and smelting the electrode blocks for three times by using a vacuum consumable arc smelting furnace to prepare ingots with the diameter of phi 620mm.
And performing cogging forging, drawing and circle throwing on the prepared cast ingot by using a resistance furnace to prepare a round billet with the diameter of phi 120 mm. Specifically, firstly, reversing pier pulling is carried out by adopting multiple fire times, the heating temperature is 1050 ℃, the heat preservation time is 200min, and the diameter of the cast ingot is reduced to phi 200mm; then, a drawing process of one heating time is carried out, the heating temperature is 1000 ℃, the finish forging temperature is 900 ℃, and the heat preservation time is 200min, so that a round billet with the diameter of phi 120mm is prepared.
And (3) continuously rolling the round billet in a large deformation manner to obtain a coiled rod billet with the diameter of phi 8 mm. Specifically, an electric furnace is adopted for heating, the heating temperature is 900 ℃, the heat preservation time is 90min, the finish rolling temperature is 700 ℃, and the diameter of a round billet is reduced to phi 8mm through continuous large-deformation rolling to prepare a coiled rod billet with the diameter of phi 8 mm.
And (3) performing stress relief annealing treatment on the prepared coiled bar blank, wherein the annealing temperature is 850 ℃, and the annealing time is 1h.
Firstly, performing a round-planning and skinning process on the annealed rod coil blank, and skinning the rod coil blank to a diameter phi of 7mm by using a centerless lathe; then, the scalped rod blank with the diameter of phi 7mm is subjected to rough drawing processing to obtain a wire coil blank with the diameter of phi 6mm, and then the wire coil blank with the diameter of phi 2.5mm is subjected to fine drawing processing.
Wherein, a tubular heating furnace is adopted in the rough drawing and the fine drawing, the drawing temperature in the rough drawing is 600 ℃, the drawing speed is 15m/min, the single-pass deformation is 10 percent, and the total deformation is 80 percent; the drawing temperature in the fine drawing process is 600 ℃, the drawing speed is 15m/min, the single-pass deformation is 5 percent, and the total deformation is 60 percent. And performing an intermediate annealing process after the rough drawing and the fine drawing are finished, wherein the heating temperature is 700 ℃, and the heat preservation time is 2h.
And (2) annealing the finished product of the coil wire blank subjected to finish drawing by using a resistance furnace, wherein the annealing temperature is 700 ℃, the annealing time is 1h, sizing and polishing the annealed coil wire blank until the diameter is phi 2.0mm, the surface of the wire material is bright, and then carrying out chemical coating treatment on the wire material to finally obtain the large-single-weight TC4 titanium wire rod for the aerospace fastener, wherein the wire weight can reach 105kg.
The large single weight TC4 titanium wire rod for aerospace fasteners prepared in example 1 had an Al content of 6.0%, a V content of 4.0%, an O content of 0.15%, an Fe content of 0.16%, a Ti content of 89.69%, and a disk weight of 105kg. As shown in FIG. 1, the dimensional tolerance is (0, -0.03) mm, the tensile strength of the large single weight TC4 titanium disc round wire for the aerospace fastener is 1018MPa, the elongation is 17.5%, the tensile strength in a solid solution aging state is 1283MPa, the elongation is 13.5%, and the shear strength is 748MPa, the transverse microstructure of the product prepared by the example 1 is A1 grade as shown in FIG. 2, and the longitudinal microstructure is AA1 as shown in FIG. 3.
Example 2
Titanium sponge, aluminum-vanadium alloy and aluminum beans are used as raw materials, and the mass percentages of the elements are as follows: al 6.2%, V4.2%, O0.18%, fe 0.22% and Ti 89.2%, respectively weighing the above raw materials, mixing, pressing the mixed raw materials into electrode blocks by using a 3500t oil press, and smelting the electrode blocks for three times by using a vacuum consumable arc smelting furnace to prepare ingots with the diameter of phi 620mm.
And performing cogging forging, drawing and circle throwing on the prepared cast ingot by using a resistance furnace to prepare a round billet with the diameter of phi 150 mm. Specifically, firstly, reversing pier pulling is carried out by adopting multiple fire times, the heating temperature is 1050 ℃, the heat preservation time is 200min, and the diameter of the cast ingot is reduced to phi 200mm; then, a drawing process of one heating time is carried out, the heating temperature is 1000 ℃, the finish forging temperature is 900 ℃, and the heat preservation time is 200min, so that a round billet with the diameter of phi 150mm is prepared;
and (3) continuously rolling the round billet in a large deformation manner to obtain a coiled rod billet with the diameter of phi 15 mm. Specifically, an electric furnace is adopted for heating, the heating temperature is 950 ℃, the heat preservation time is 60min, the finish rolling temperature is 850 ℃, and the diameter of a round billet is reduced to phi 15mm through continuous large-deformation rolling, so that a coiled rod billet with the diameter of phi 15mm is prepared.
And (3) performing stress relief annealing treatment on the prepared coiled bar blank, wherein the annealing temperature is 750 ℃, and the annealing time is 2 hours.
The annealed coiled rod blank is subjected to a round sizing and skinning process, and a centerless lathe is adopted to skin the coiled rod blank to a diameter phi 14mm; then, the scalped rod blank with the diameter of phi 14mm is subjected to rough drawing processing to obtain a wire coil blank with the diameter of phi 10mm, and then the wire coil blank with the diameter of phi 7.5mm is subjected to fine drawing processing.
Wherein, a tubular heating furnace is adopted in the rough drawing and the fine drawing, the drawing temperature in the rough drawing is 850 ℃, the drawing speed is 2m/min, the single-pass deformation is 40 percent, and the total deformation is 40 percent; the drawing temperature in the fine drawing process is 800 ℃, the drawing speed is 2m/min, the single-pass deformation is 20 percent, and the total deformation is 30 percent. And performing an intermediate annealing process after the rough drawing and the fine drawing are finished, wherein the heating temperature is 850 ℃, and the heat preservation time is 0.5h.
And (3) annealing the finished product of the coiled wire blank subjected to finish drawing by adopting a resistance furnace, wherein the annealing temperature is 700 ℃, the annealing time is 1h, sizing and polishing are carried out on the annealed coiled wire blank until the diameter is 7.0mm and the surface of the wire material is bright, then, the wire material is subjected to chemical coating treatment, and finally the large single-weight TC4 titanium wire rod for the aerospace fastener is prepared, wherein the wire weight can reach 120kg.
The large single weight TC4 titanium wire rod for aerospace fasteners prepared in example 2 has Al content of 6.2%, V content of 4.2%, O content of 0.18%, fe content of 0.22%, ti content of 89.21%, disk weight of 120kg, as shown in FIG. 4, dimensional tolerance of (0, -0.03) mm, tensile strength of 1001MPa, elongation of 16.5%, tensile strength in solid solution state of 1209MPa, elongation of 13.0%, and shear strength of 761MPa, transverse microstructure of A1 grade of the product prepared in example 2 is shown in FIG. 5, and longitudinal microstructure of AA1 is shown in FIG. 6.
Example 3
Titanium sponge, aluminum-vanadium alloy and aluminum beans are used as raw materials, and the mass percentages of the elements are as follows: 6.5 percent of Al, 4.5 percent of V, 0.16 percent of O, 0.25 percent of Fe and 88.59 percent of Ti are subjected to burdening calculation, then the raw materials are respectively weighed and mixed, then 3500t of oil press is adopted to press the mixed raw materials into electrode blocks, and then a vacuum consumable arc melting furnace is used to carry out three times of melting on the electrode blocks to prepare ingots with the diameter of phi 620mm.
And performing cogging forging, drawing and circle throwing on the prepared cast ingot by using a resistance furnace to prepare a round billet with the diameter of phi 135 mm. Specifically, firstly, reversing pier pulling is carried out by adopting multiple fire times, the heating temperature is 1150 ℃, the heat preservation time is 200min, and the diameter of the cast ingot is reduced to phi 200mm; then, a drawing process of one heating time is carried out, the heating temperature is 1050 ℃, the finish forging temperature is 900 ℃, and the heat preservation time is 200min, so that a round billet with the diameter of phi 135mm is obtained;
and (3) carrying out continuous large-deformation rolling on the prepared round billet to prepare a coiled rod billet with the diameter of phi 10 mm. Specifically, an electric furnace is adopted for heating, the heating temperature is 920 ℃, the heat preservation time is 80min, the finish rolling temperature is 800 ℃, and the diameter of a round billet is reduced to phi 10mm through continuous large-deformation rolling, so that a coiled rod billet with the diameter of phi 10mm is prepared.
And (3) performing stress relief annealing treatment on the prepared coiled bar blank, wherein the annealing temperature is 650 ℃, and the annealing time is 1.5h.
Firstly, performing a round-planning and skinning process on the annealed rod coil blank, and skinning the rod coil blank to a diameter phi of 9mm by using a centerless lathe; then, the scalped coil rod blank with the diameter of phi 9mm is subjected to rough drawing processing to form a coil wire blank with the diameter of phi 8mm, and then the coil wire blank with the diameter of phi 5.5mm is subjected to fine drawing processing.
Wherein, a tubular heating furnace is adopted in the rough drawing and the fine drawing, the drawing temperature in the rough drawing is 750 ℃, the drawing speed is 8.5m/min, the single-pass deformation is 25 percent, and the total deformation is 60 percent; the drawing temperature in the fine drawing process is 700 ℃, the drawing speed is 8.5m/min, the single-pass deformation is 12.5 percent, and the total deformation is 45 percent. And performing an intermediate annealing process once after the rough drawing and the finish drawing, wherein the heating temperature is 750 ℃, and the heat preservation time is 1h.
And (2) annealing the finished product of the coil wire blank subjected to finish drawing by using a resistance furnace, wherein the annealing temperature is 700 ℃, the annealing time is 1h, sizing and polishing the annealed coil wire blank until the diameter is phi 5.0mm, the surface of the wire material is bright, and then carrying out chemical coating treatment on the wire material to finally obtain the large-single-weight TC4 titanium wire rod for the aerospace fastener, wherein the wire weight can reach 115kg.
Wherein the large single weight TC4 titanium wire rod for aerospace fasteners prepared in example 3 has Al content of 6.5%, V content of 4.5%, O content of 0.2%, fe content of 0.25%, ti content of 88.55%, disk weight of 115kg, as shown in FIG. 7, dimensional tolerance of (0, -0.03) mm, tensile strength of 1022MPa, elongation of 23.0%, tensile strength 1246MPa in the solid solution state, elongation of 20.5%, and shear strength 736MPa, transverse microstructure of the product prepared in example 3 is A1 grade as shown in FIG. 8, and longitudinal microstructure of AA1 is as shown in FIG. 9.
The invention discloses a preparation method of a large-single-weight TC4 titanium disk round wire for aerospace fasteners, which comprises the following steps: through the procedures of ingot casting preparation, forging, round billet drawing, heat treatment, drawing, surface sizing treatment and the like, the TC4 titanium wire rod with large single weight and better uniformity of tissue, mechanical property and size can be produced in batch, the production efficiency of the TC4 titanium wire rod with large single weight for aerospace fasteners is effectively improved, and import substitution is realized.
The invention relates to a large-single-weight TC4 titanium disc round wire for aerospace fasteners, which is characterized in that the transverse structure uniformity of a large-single-weight rolled blank is controlled by strictly controlling the components of key elements Al, V, fe and O of an ingot, a processing and preparation process route and each process parameter setting, and the longitudinal structure, performance and surface quality consistency of a large-single-weight wire product are controlled by parameters such as rough drawing processing temperature, pass deformation, speed, total deformation, intermediate annealing and the like. The TC4 titanium coiled wire prepared by the method has the advantages that the tolerance of the head, the middle and the tail of each coiled whole wire is not more than 0.03mm, the surface quality has no defects such as cracks, strain and the like, the eddy current flaw detection of the wire is qualified, and the single weight can reach 100kg or more; the finished product of the wire rod has uniform and fine transverse microstructures, grades of A1-A3 and obvious longitudinal flow lines, the grades of the microstructures reach AA1-AA3, and the performance is stable; the TC4 titanium disc round wire prepared by the method has the characteristics of large disc weight, high precision, uniform and consistent structure and performance, and can be widely applied to various TC4 titanium aerospace fasteners such as aerospace and the like. The preparation method of the large-single-weight TC4 titanium disc round wire for the aerospace fastener comprises the following steps: through the procedures of ingot casting preparation, forging, round billet drawing, heat treatment, drawing, surface sizing treatment and the like, the TC4 titanium wire rod with large weight and good uniformity of tissue, mechanical property and size can be produced in batch, the production efficiency of the TC4 titanium wire rod for aerospace fasteners is effectively improved, and import substitution is realized.

Claims (4)

1. The preparation method of the large-single-weight TC4 titanium disc round wire for the aerospace fastener is characterized by comprising the following steps of:
step 1, preparing an ingot: the sponge titanium, the aluminum vanadium alloy and the aluminum beans are used as raw materials, and the mass percentages of the elements are as follows: 6.0-6.5% of Al, 4.0-4.5% of V, 0.15-0.18% of O, 0.16-0.25% of Fe and the balance of Ti, respectively weighing the raw materials, mixing and pressing to prepare electrode blocks, and smelting the electrode blocks for three times by using a vacuum consumable arc smelting furnace to prepare cast ingots;
step 2, forging and drawing to form a round billet: performing cogging forging, drawing and circle throwing on the ingot prepared in the step 1 by using a resistance furnace to prepare a round billet with the diameter of phi 120-phi 150 mm;
step 3, rolling into a bar: carrying out continuous large-deformation rolling on the round billet obtained in the step 2 to obtain a coiled rod billet with the diameter of phi 8-phi 15 mm;
step 4, heat treatment: performing stress relief annealing treatment on the coiled rod blank prepared in the step 3;
step 5, coarse and fine drawing: processing the coiled bar blank processed in the step 4 through a round sizing and peeling process, then sequentially performing rough drawing and fine drawing, and finally processing the coiled bar blank into a coiled wire blank with the diameter of phi 2.5-phi 7.5 mm;
the rough drawing process specifically comprises the following steps: drawing and processing the coiled rod blank processed in the step 4 to form a coiled wire blank with the diameter of phi 6-phi 10 mm; wherein the drawing temperature in the rough drawing process is 600-850 ℃, the drawing speed is 2-15m/min, the single-pass deformation is 10-40%, and the total deformation is 40-80%;
the fine drawing process specifically comprises the following steps: drawing the coiled wire blank subjected to the rough drawing treatment to form a coiled wire blank with the diameter of phi 2.5-phi 7.5mm through a fixed die; wherein the drawing temperature in the fine drawing process is 600-800 ℃, the drawing speed is 2-15m/min, the single-pass deformation is 5-20%, and the total deformation is 30-60%;
step 6, heat treatment: carrying out finished product annealing treatment on the coiled wire blank prepared in the step 5;
and 7, sizing and polishing the coiled wire blank subjected to the heat treatment in the step 6 until the surface of the coiled wire blank is bright, and then carrying out chemical coating treatment on the coiled wire blank to finally obtain the large-single-weight TC4 titanium coiled wire material for the aerospace fastener.
2. The preparation method of the large-single-weight TC4 titanium wire rod for the aerospace fastener as claimed in claim 1, wherein in the step 3, the continuous large-deformation rolling process is carried out by heating in an electric furnace, the heating temperature is 900-950 ℃, the holding time is 60-90min, and the final rolling temperature is 700-850 ℃.
3. The method for preparing large single weight TC4 titanium wire rods for aerospace fasteners as claimed in claim 1 or 2, wherein the diameter of the large single weight TC4 titanium wire rods for aerospace fasteners prepared in the step 7 is phi 2-phi 7mm.
4. The large-single-weight TC4 titanium disc round wire for the aerospace fastener is characterized by being prepared by the preparation method of the large-single-weight TC4 titanium disc round wire for the aerospace fastener, which is disclosed by any one of claims 1 to 3, wherein the mass percentage ranges of the elements are as follows: 6.0 to 6.5 percent of Al, 4.0 to 4.5 percent of V, 0.15 to 0.18 percent of O, 0.16 to 0.25 percent of Fe and the balance of Ti.
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