CN117399455A - Roller die drawing preparation method of high-strength TC10 titanium alloy - Google Patents
Roller die drawing preparation method of high-strength TC10 titanium alloy Download PDFInfo
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- 102100038339 Rho-related GTP-binding protein RhoQ Human genes 0.000 title claims abstract description 50
- 229910001069 Ti alloy Inorganic materials 0.000 title claims abstract description 45
- 238000002360 preparation method Methods 0.000 title claims abstract description 13
- 238000000137 annealing Methods 0.000 claims abstract description 47
- 238000011282 treatment Methods 0.000 claims abstract description 43
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 35
- 239000000956 alloy Substances 0.000 claims abstract description 35
- 238000010438 heat treatment Methods 0.000 claims abstract description 23
- 238000000034 method Methods 0.000 claims abstract description 23
- 230000032683 aging Effects 0.000 claims abstract description 22
- 239000006104 solid solution Substances 0.000 claims abstract description 14
- 239000000463 material Substances 0.000 claims description 32
- 238000004519 manufacturing process Methods 0.000 claims description 10
- 238000004321 preservation Methods 0.000 claims description 6
- 238000012545 processing Methods 0.000 abstract description 5
- 239000000243 solution Substances 0.000 description 8
- 239000013078 crystal Substances 0.000 description 6
- 230000035882 stress Effects 0.000 description 5
- 229910000831 Steel Inorganic materials 0.000 description 4
- 238000001953 recrystallisation Methods 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 239000013585 weight reducing agent Substances 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 238000001887 electron backscatter diffraction Methods 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000002386 leaching Methods 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000005482 strain hardening Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 238000005491 wire drawing Methods 0.000 description 1
- 230000003245 working effect Effects 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
- C21D9/525—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length for wire, for rods
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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
- B21C1/00—Manufacture of metal sheets, metal wire, metal rods, metal tubes by drawing
- B21C1/02—Drawing metal wire or like flexible metallic material by drawing machines or apparatus in which the drawing action is effected by drums
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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
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- 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
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- Physics & Mathematics (AREA)
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Abstract
The invention discloses a roller die drawing preparation method of high-strength TC10 titanium alloy; the method comprises the following steps: carrying out multi-pass roller die drawing on the hot rolled blank in a high-temperature two-phase region, and then carrying out first annealing heat treatment; then carrying out multi-pass roller die drawing in a low-temperature area of the two-phase area, and then carrying out secondary annealing heat treatment; finally, carrying out third roller die drawing and third annealing treatment in a low-temperature area of the two-phase area, and then carrying out solid solution and aging heat treatment on the alloy; the alloy has excellent room temperature mechanical property in a solid solution state, the tensile strength is 1526.5MPa, the yield strength is 1402.5MPa, the elongation after fracture is 10.5%, and the area shrinkage is 27.5%; the room temperature mechanical property of the product is superior to that of the similar product obtained by the existing fixed die drawing; in addition, compared with the fixed die drawing, the invention has high processing efficiency, low drawing force and high alloy surface quality, and can be used for processing TC10 and other high-strength dual-phase titanium alloy wires.
Description
Technical Field
The invention belongs to the technical field of titanium alloy wires, and relates to a roller die drawing preparation method of high-strength TC10 titanium alloy.
Background
Along with the continuous improvement of the aviation industry on the requirements of low cost and high safety and reliability of the aircraft structure, weight reduction becomes an important technical index for the design and manufacture of the aviation structure; titanium alloy fasteners having high specific strength, good corrosion resistance and excellent fatigue properties are used in ever increasing amounts in aircraft. In the 50 s of the 20 th century, a TC4 alloy (Ti-6 Al-4V) bolt is used for replacing a traditional 30CrMnSiA steel bolt on a certain bomber, so that a remarkable weight reduction effect is achieved; the TC4 alloy has excellent comprehensive mechanical properties, and the smelting and hot working processes are mature; however, with the continuous development of the aerospace industry, the existing TC4, TC16 and other medium-strength titanium alloy wires cannot meet the requirements of the new generation of models on ultra-high strength and toughness fasteners; therefore, TC10 alloy is used as a high Jiang +beta dual-phase titanium alloy and has become a preferred material for a new generation of high-strength titanium alloy fasteners.
The TC10 alloy comprises Ti-6Al-6V-2Sn-0.5Cu-0.5Fe, is an alpha+beta-element-rich double-phase high-strength titanium alloy developed on the basis of TC4, has good room temperature mechanical property, heat resistance (can be used for a long time at 400 ℃), better oxidation resistance, corrosion resistance and the like, and is widely applied to the fields of aerospace, ocean engineering, nuclear energy, petroleum exploration and the like; compared with TC4 alloy, the TC10 titanium alloy has the advantages that the beta stabilizing element is increased, the heat treatment strengthening effect is more obvious, and the room temperature and high temperature strength are obviously improved. The annealed strength is higher than that of TC4 titanium alloy, and the strength after solution aging treatment is far higher than that of TC4 alloy;
however, few reports are made about the preparation, structure control, mechanical property optimization, dimensional accuracy control, and wire surface coating process of TC10 alloy wire. The cold workability of the TC10 alloy is inferior to that of pure titanium, TC16, TB3, ti45Nb, and the like. For titanium alloys with poor cold working properties, an alkaline leaching hot drawing process is generally used to prepare wires with bright surfaces. When the fixed die is used for drawing production, the wire rod is small in specification, high in strength, difficult to uniformly coat with lubricating medium and the like, and the phenomenon of wire breakage frequently occurs. The process measures such as reducing the drawing speed and the pass deformation can reduce the risk of broken wires to a certain extent. However, as the pass deformation is low, the uniformity of alloy structure and the uniformity of performance are reduced; in addition, the pass deformation is reduced, resulting in a significant decrease in production efficiency. Therefore, it is necessary to develop a new drawing process suitable for Gao Jiangfu β dual phase titanium alloy such as TC 10. The principle of drawing the roller die is that the roller is driven to rotate by the drawing force applied to the metal to realize metal deformation, and the principle is that the sliding friction in the drawing of the fixed die is converted into rolling friction, and the die has the characteristics of simple die manufacture, energy saving, high drawing speed, large pass drawing deformation, strong die hole universality, multiple purposes and the like. The method is widely applied to the preparation of high-performance steel wires. However, roller die drawing has less application in titanium alloys than iron and steel materials. CN102477502A, CN105970019B discloses a fixed die drawing preparation method of TC4 titanium alloy wires, the tensile strength of the alloy wires is more than 1200MPa, and the elongation is more than 8%. CN107377661a discloses a method for preparing TC4 titanium alloy by using roller die drawing, the mechanical property of TC4 alloy prepared by the method is equivalent to that of fixed die drawing, the production efficiency is high and the production cost is low. CN113351677B discloses a fixed mould hot drawing preparation method of TC10 titanium alloy disc wire, the room temperature tensile property of the wire meets the material requirement for fasteners, and the tensile strength after solution aging treatment can reach 1350MPa. However, the production process for preparing TC10 titanium alloy wires by using roll die drawing is not reported at present. Based on a great deal of research in the existing steel materials, the surface quality of the wire produced by roller die drawing is better, the drawing force is small, the risk of broken wires is greatly reduced, the multi-frame continuous processing can be realized, and the production efficiency is improved.
Disclosure of Invention
The invention aims to provide a roller die drawing preparation method of high-strength TC10 titanium alloy, which solves the problems of wire breakage and low processing efficiency of the traditional drawing process of the traditional TC10 titanium alloy.
The technical scheme adopted by the invention is that the roll die drawing preparation method of the high-strength TC10 titanium alloy is implemented according to the following steps:
step 1, carrying out multi-pass roller die drawing on a hot rolled wire blank in a high-temperature two-phase region, and then carrying out annealing treatment;
step 2, carrying out multi-pass roller die drawing on the annealed wire again, gradually reducing the drawing temperature of each pass, and then carrying out secondary annealing treatment;
step 3, carrying out multi-pass roller die drawing again on the wire material subjected to secondary annealing in a low-temperature area of a two-phase area, gradually reducing the drawing temperature of each pass, and finally carrying out three annealing treatments;
and 4, carrying out solid solution/aging heat treatment on the alloy to finally obtain the TC10 titanium alloy wire with the diameter of 2.7-6.8 mm.
The invention is also characterized in that:
wherein in the step 1, the diameter of the hot rolled wire blank is 6-14 mm, the drawing deformation is 38-75%, and the annealing process specifically comprises the following steps: annealing at 680-780 deg.c for 2 hr;
wherein the drawing deformation amount in the step 2 is 40-60%, and the secondary annealing process specifically comprises the following steps: annealing at 680-750 deg.c for 2 hr;
wherein the drawing deformation in the step 3 is 30-50%, and the three annealing processes are as follows: annealing at 690-730 deg.c for 2 hr;
wherein the drawing temperature in the step 1, the step 2 and the step 3 is 780-880 ℃;
the specific deformation amounts of the multiple passes in the step 1, the step 2 and the step 3 are as follows:
the deformation amount of each pass in the step 1 is not less than 14%;
the deformation amount of each pass in the step 2 is not less than 12%;
the deformation amount of each pass in the step 3 is not less than 12%;
wherein the multi-pass roller die drawing wire speed in the step 1, the step 2 and the step 3 is 1.5-4.0 m/min.
The solid solution/aging heat treatment in the step 4 is specifically as follows: the solid solution temperature is 900 ℃, the heat preservation time is 60-120 min, the aging temperature is 500-540 ℃, and the heat preservation time is 4-8 hours, and finally the TC10 titanium alloy wire with the diameter of 2.7-6.8 mm is obtained.
The beneficial effects of the invention are as follows:
the roller die drawing preparation method of the high-strength TC10 titanium alloy can improve the processing efficiency, reduce the production cost, prepare the TC10 titanium alloy wire material in a roller die drawing mode, wherein the wire material has the room temperature tensile strength of 1392.1MPa, the yield strength of 1195.3MPa and the elongation after fracture of 11.7 percent after roller die drawing and annealing heat treatment; the tensile strength of the TC10 alloy wire rod is 1526.5MPa, the yield strength of the TC10 alloy wire rod is 1402.5MPa, the elongation after fracture is 10.5%, and the TC10 alloy wire rod is more excellent in strong plastic matching with the TC10 alloy wire rod prepared by the existing rolling and fixed die drawing. In addition, the TC10 alloy wire prepared by the roll die drawing method has good surface quality, uniform and fine microstructure and room temperature tensile property far exceeding the performance requirement of the related standard on the fastener material.
Drawings
FIG. 1 shows the microstructure of a TC10 alloy wire in the as-hot rolled state in the transverse (a) and longitudinal (b) directions;
FIG. 2 shows the transverse (a) and longitudinal (b) microstructures of the TC10 alloy wire after the 3 rd roll die drawing;
FIG. 3 is a comparison of microstructures of TC10 alloy wires at different annealing temperatures;
FIG. 4 shows the microstructure of TC10 alloy wire in various solid solution aging processes.
Detailed Description
The invention will be described in detail below with reference to the drawings and the detailed description.
The invention provides a roller die drawing preparation method of a high-strength TC10 titanium alloy, which is implemented by the following steps:
step 1, performing 4-pass roller die drawing on a blank with the diameter of 6-14 mm at the temperature of 830-880 ℃, wherein the drawing speed of the 4-pass roller die drawing is 1.5-4.0 m/min, the deformation amount of each pass is 13-17%, the total drawing deformation amount is 38-75%, and then performing annealing treatment for 2 hours at the temperature of 680-780 ℃;
step 2, carrying out roller die drawing with the deformation amount of 14-16% for 4-pass roller die drawing again at 800-850 ℃, wherein the drawing speed of the 4-pass roller die drawing is 1.5-4.0 m/min, the total drawing deformation amount is 40-60%, and then carrying out annealing treatment at 680-750 ℃ for 2 hours;
step 3, carrying out 3-pass roller die drawing with 16-18% of drawing deformation amount at 780-830 ℃, wherein the 3-pass roller die drawing wire drawing speed is 1.5-4.0 m/min, the total drawing deformation amount is 30-50%, and finally carrying out annealing treatment at 690-730 ℃ for 2 hours;
and 4, carrying out solid solution/aging heat treatment on the alloy, wherein the solid solution temperature is 900 ℃, the heat preservation time is 60-120 min, the aging temperature is 500-540 ℃, and the heat preservation time is 4-8 hours, and finally obtaining the TC10 titanium alloy wire with the diameter of 2.7-6.8 mm.
FIG. 1 shows an EBSD diagram of the original hot rolled state transverse and longitudinal microstructure of the TC10 alloy; FIG. 1-a is transverse and FIG. 1-b is longitudinal; it is not difficult to find that the grains consist of deformed grains and partially equiaxed grains. It can be seen that the alloy billets undergo dynamic recrystallization during hot rolling and structure refinement. Meanwhile, the deformation of part of the hard oriented crystal grains is smaller than the critical deformation of dynamic recrystallization, and the part of the hard oriented crystal grains still presents deformed elongated crystal grain morphology, so that mixed crystal structures of fine equiaxed crystal grains and elongated deformed crystal grains are presented; as shown in figure 2, the TC10 alloy wire has a 3 rd roll die drawing back transverse and longitudinal microstructure, the transverse and longitudinal microstructure is fine and uniform, and the grain size rating can reach 15 grades; the material is fully crushed in the drawing process of the two-phase zone roller die, and dynamic recrystallization occurs, so that fine equiaxed grains are obtained; FIG. 3 shows the microstructure comparison of TC10 alloy wires at different annealing temperatures; FIGS. 3a,3b,3c,3d are the microstructures after annealing at 710℃/2h, 730℃/2h, 750℃/2h, and 770℃/2h, respectively; it can be found that after annealing, the alpha phase undergoes static recrystallization to form equiaxed grains, and the grains grow up with the increase of the annealing temperature; the average grain size of the alloy increases from 2.1 μm to 3.4 μm; FIG. 4 shows the microstructure comparison of TC10 alloy wires under different solid solution aging processes; FIG. 4a is a microstructure after 900 ℃/1h solid solution, 540 ℃/4h aging treatment; FIG. 4b is a microstructure after 900 ℃/1h solid solution, 580 ℃/4h aging treatment; as can be seen from fig. 4, the alloy is subjected to a two-phase zone solution aging treatment to obtain a typical two-state structure consisting of equiaxed alpha-phase and beta-transition matrices; in general, titanium alloy binary structure has excellent strong plastic matching, and as aging temperature is reduced, secondary alpha phase size is finely dispersed, and alloy strength is increased.
Example 1
Step 1, hot-rolled wire blanks with the diameter of 8.8mm are subjected to roller die drawing at the heating temperature of 830 ℃ at the drawing speed of 2.0 m/min; each pass is sequentially drawn to the diameters of 8.0mm, 7.3mm, 6.8mm and 6.3mm, namely from the diameter of 8.8mm to the diameter of 6.3mm, and the total deformation is 48.7%. Then annealing treatment is carried out at 710 ℃/2 hours;
and 2, heating the wire material with the diameter of 6.3mm treated in the step 1 at 800 ℃ and carrying out roller die drawing at the speed of 2.2 m/min. Drawing to the diameter of 5.8mm, 5.3mm, 4.9mm and 4.5mm in sequence in each pass, wherein the total deformation is 48.9%; then annealing treatment is carried out at 710 ℃/2 hours;
step 3, drawing the wire material with the diameter of 4.5mm treated in the step 2 at 780 ℃ at a drawing speed of 1.2 m/min; drawing to 4.1mm, 3.7mm and 3.4mm in each pass in sequence, namely drawing a wire material with the diameter of 4.5mm to 3.4mm, wherein the total deformation is 42.9%, and finally carrying out stress relief annealing treatment at 720 ℃/2 hours;
and 4, carrying out solution treatment at 900 ℃/1 hour and aging treatment at 520 ℃/2 hours on the wire rod obtained in the step 3 to obtain the high-strength TC10 titanium alloy wire rod. The mechanical properties at room temperature are as follows: the tensile strength is 1523MPa, the yield strength is 1407MPa, and the elongation is 9.5%.
Example 2
Step 1, hot rolled materials with the diameter of 8.8mm are subjected to roller die drawing at the heating temperature of 880 ℃ and the drawing speed of 2.5 m/min; each pass is sequentially drawn to the diameter of 8.0mm, 6.9mm, 5.6mm and 4.7mm, namely from the diameter of 8.8mm to the diameter of 4.7mm, and the total deformation is 71.4%. Then annealing treatment is carried out at 710 ℃/2 hours;
and 2, heating the wire material with the diameter of 4.7mm treated in the step 1 at 820 ℃ and carrying out roller die drawing with the drawing speed of 2.2 m/min. Drawing to the diameter of 4.3mm, 3.9mm and 3.6mm in each pass, drawing the wire material with the diameter of 6.3mm to the diameter of 3.6mm, and obtaining the total deformation of 41.3%; then annealing treatment is carried out at 710 ℃/2 hours;
and 3, drawing the wire material with the diameter of 3.6mm treated in the step 2 at the heating temperature of 800 ℃ at a drawing speed of 2.0 m/min. Drawing to 3.3mm, 3.0mm and 2.8mm in each pass in sequence, namely drawing the wire material with the diameter of 3.6mm to 2.8mm in 3 passes, wherein the total deformation reaches 39.5%, and finally carrying out stress relief annealing treatment at 720 ℃/2 hours;
and 4, carrying out solution treatment at 900 ℃/1 hour and aging treatment at 540 ℃/2 hours on the material to obtain the high-strength TC10 titanium alloy wire. The mechanical properties at room temperature are as follows: the tensile strength is 1542MPa, the yield strength is 1412MPa, and the elongation is 10.2%.
Example 3
Step 1, hot rolled stock with a diameter of 8.2mm is drawn at a drawing speed of 3.5m/min at a heating temperature of 880 ℃. Drawing to 7.5mm, 6.9mm, 6.4mm and 5.9mm in each pass in sequence, namely reducing the diameter to 5.9mm from the diameter of 8.2mm through 4 passes of drawing, and the total deformation is 48.2%; then annealing treatment is carried out at 710 ℃/2 hours;
and 2, heating the wire material with the diameter of 5.9mm treated in the step 1 at 850 ℃ and carrying out roller die drawing with the drawing speed of 3.0 m/min. Drawing to the diameter of 5.4mm, 4.9mm, 4.5mm and 4.1mm in each pass in sequence, namely drawing the wire with the diameter of 5.9mm to the diameter of 4.1mm in 4 passes, wherein the total deformation is 51.7%; then annealing treatment is carried out at 710 ℃/2 hours;
and 3, drawing the wire material with the diameter of 4.1mm treated in the step 2 at the heating temperature of 830 ℃ at a drawing speed of 2.5 m/min. Drawing to 3.7mm, 3.3mm and 3.0mm in each pass in sequence, namely drawing a wire with the diameter of 4.1mm to 3.0mm, wherein the total deformation reaches 46.4%, and finally carrying out stress relief annealing treatment at 720 ℃/2 hours;
step 4, carrying out solution treatment at 900 ℃/1 hour and aging treatment at 540 ℃/2 hours on the material to obtain a high-strength TC10 titanium alloy wire; the mechanical properties at room temperature are as follows: the tensile strength is 1524MPa, the yield strength is 1416MPa, and the elongation is 9.4%.
Example 4
Step 1, hot rolled materials with the diameter of 9.5mm are subjected to roller die drawing at a drawing speed of 3.0m/min at a heating temperature of 880 ℃; drawing to the diameter of 8.6mm, 7.8mm, 7.2mm and 6.6mm in each pass in sequence, namely reducing the diameter to the diameter of 6.6mm from the drawing with the diameter of 9.5mm by 4 passes, and ensuring the total deformation amount to be 51.7%; then annealing treatment is carried out at 710 ℃/2 hours;
step 2, heating the wire material with the diameter of 6.6mm treated in the step 1 at 850 ℃ and carrying out roller die drawing with the drawing speed of 2.5 m/min; drawing to 6.1mm, 5.6mm, 5.1mm and 4.7mm in each pass, drawing the wire material with the diameter of 6.6mm to 4.7mm in 4 passes, and obtaining the total deformation of 49.1%; then annealing treatment is carried out at 710 ℃/2 hours;
step 3, drawing the wire material with the diameter of 4.7mm treated in the step 2 at the heating temperature of 830 ℃ at a drawing speed of 2.8 m/min; drawing to 4.3mm, 3.9mm and 3.6mm in each pass in sequence, namely drawing a wire material with the diameter of 4.7mm to 3.6mm, wherein the total deformation reaches 41.2%, and finally carrying out stress relief annealing treatment at 720 ℃/2 hours;
and 4, carrying out solution treatment at 900 ℃/1 hour and aging treatment at 540 ℃/2 hours on the material to obtain the high-strength TC10 titanium alloy wire. The mechanical properties at room temperature are as follows: the tensile strength is 1506MPa, the yield strength is 1407MPa, and the elongation is 12%.
Example 5
Step 1, hot rolled stock with the diameter of 12mm is subjected to roller die drawing at a drawing speed of 3.0m/min at a heating temperature of 860 ℃. Each pass is sequentially drawn to the diameter of 11.2mm, 10.6mm, 10mm and 9.4mm, namely the diameter is reduced from the diameter of 12mm to the diameter of 9.4mm through 4 passes of drawing, and the total deformation is 38.6%. Then carrying out annealing treatment at 750 ℃/2 hours;
step 2, heating the wire material with the diameter of 9.4mm treated in the step 1 at 840 ℃ and carrying out roller die drawing with the drawing speed of 3 m/min; drawing to the diameter of 8.6mm, 8.0mm, 7.4mm and 6.8mm in each pass, drawing the wire with the diameter of 9.4mm to the diameter of 6.8mm in 4 passes, and obtaining the total deformation of 47.6%; and then an annealing treatment of 750 ℃/2 hours is performed.
Step 3, drawing the wire material with the diameter of 6.8mm treated in the step 2 at 810 ℃ at a drawing speed of 3 m/min; drawing to 6.2mm, 5.7mm and 5.2mm in each pass in sequence, namely drawing a wire material with the diameter of 6.8mm to the diameter of 5.2mm, wherein the total deformation reaches 41.5%, and finally carrying out stress relief annealing treatment at the speed of 730 ℃/2 hours;
and 4, carrying out solution treatment at 900 ℃/1 hour and aging treatment at 540 ℃/2 hours on the material to obtain the high-strength TC10 titanium alloy wire. The mechanical properties at room temperature are as follows: the tensile strength is 1482MPa, the yield strength is 1367MPa and the elongation is 13.5%.
Table 1 shows the relationship between the grain size and the strength of TC10 alloy under different drawing deformation amounts
| Diameter/mm | Grain size/. Mu.m | Tensile strength/MPa | Yield strength/MPa |
| 8.8 | 0.85 | 1214.95 | 1132.25 |
| 6.3 | 1.30 | 1193.29 | 1060.79 |
| 4.5 | 1.40 | 1392.04 | 1195.29 |
| 3.4 | 1.45 | 1289.18 | 1051.76 |
Claims (8)
1. The roll die drawing preparation method of the high-strength TC10 titanium alloy is characterized by comprising the following steps of:
step 1, carrying out multi-pass roller die drawing on a hot rolled wire blank in a high-temperature two-phase region, and then carrying out annealing treatment;
step 2, carrying out multi-pass roller die drawing on the annealed wire again, gradually reducing the drawing temperature of each pass, and then carrying out secondary annealing treatment;
step 3, carrying out multi-pass roller die drawing again on the wire material subjected to secondary annealing in a low-temperature area of a two-phase area, gradually reducing the drawing temperature of each pass, and finally carrying out three annealing treatments;
and 4, carrying out solid solution/aging heat treatment on the alloy to finally obtain the TC10 titanium alloy wire with the diameter of 2.7-6.8 mm.
2. The method for preparing high-strength TC10 titanium alloy by roller die drawing according to claim 1, wherein the diameter of the hot rolled wire blank in the step 1 is 6-14 mm, the drawing deformation is 38-75%, and the annealing process specifically comprises: annealing treatment is carried out at 680-780 ℃ for 2 hours.
3. The method for preparing high-strength TC10 titanium alloy by roller die drawing according to claim 1, wherein the drawing deformation in the step 2 is 40-60%, and the secondary annealing process specifically comprises: annealing treatment is carried out for 2 hours at 680-750 ℃.
4. The method for preparing high-strength TC10 titanium alloy by roller die drawing according to claim 1, wherein the drawing deformation in the step 3 is 30-50%, and the three annealing processes are as follows: annealing treatment is carried out for 2 hours at 690-730 ℃.
5. The method for producing a high-strength TC10 titanium alloy according to claim 1, wherein the drawing temperature in the steps 1, 2 and 3 is 780-880 ℃.
6. The method for preparing high-strength TC10 titanium alloy by roller die drawing according to claim 1, wherein the specific deformation amounts of the multiple passes in the steps 1, 2 and 3 are as follows:
the deformation amount of each pass in the step 1 is not less than 14%;
the deformation amount of each pass in the step 2 is not less than 12%;
the deformation amount of each pass in the step 3 is not less than 12%.
7. The method for preparing high-strength TC10 titanium alloy by roller die drawing according to claim 1, wherein the multi-pass roller die drawing wire speed in the steps 1, 2 and 3 is 1.5-4.0 m/min.
8. The method for preparing high-strength TC10 titanium alloy according to claim 1, wherein said step 4 solid solution/aging heat treatment is specifically: the solid solution temperature is 900 ℃, the heat preservation time is 60-120 min, the aging temperature is 500-540 ℃, and the heat preservation time is 4-8 hours, and finally the TC10 titanium alloy wire with the diameter of 2.7-6.8 mm is obtained.
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