CN108893691B - Method for controlling uniformity of structural properties of high-strength high-plasticity TB6 titanium alloy wire - Google Patents

Method for controlling uniformity of structural properties of high-strength high-plasticity TB6 titanium alloy wire Download PDF

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CN108893691B
CN108893691B CN201810809120.4A CN201810809120A CN108893691B CN 108893691 B CN108893691 B CN 108893691B CN 201810809120 A CN201810809120 A CN 201810809120A CN 108893691 B CN108893691 B CN 108893691B
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齐立春
黄利军
黄旭
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AECC Beijing Institute of Aeronautical Materials
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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
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Abstract

The invention belongs to the technical field of titanium alloy wire preparation, and particularly relates to a method for controlling uniformity of structure properties of a high-strength high-plasticity TB6 titanium alloy wire. The method comprises the following steps: firstly, the TB6 titanium alloy bar with the specification of phi 40 mm-phi 45mm multiplied by 800 mm-1200 mm is processedHot rolling to a bar material with the specification of phi 9-10 mm through multi-pass large deformation, then cold rolling after single-phase region solution treatment, controlling the total deformation of the cold rolling to be 15-36% to obtain a wire material with the specification of phi 6-7 mm, and finally performing aging treatment on the wire material at 520-560 ℃. The method has the advantages of simple process parameter setting, convenient operation, strong process controllability and high room-temperature tensile strength sigma of the wire in an aging statebNot less than 1050MPa, yield strength sigma0.2Not less than 1000MPa, elongation delta5The reduction of area psi is more than or equal to 15%, and the reduction of area psi is more than or equal to 50%, and the batch stability is high and the repeatability is good.

Description

Method for controlling uniformity of structural properties of high-strength high-plasticity TB6 titanium alloy wire
Technical Field
The invention belongs to the technical field of titanium alloy wire preparation, and particularly relates to a method for controlling uniformity of structure properties of a high-strength high-plasticity TB6 titanium alloy wire.
Background
At present, high-strength titanium alloy becomes one of the main development directions of titanium alloy, the alloy is widely applied to the manufacturing of airplanes and helicopters as a structural material, the high-strength titanium alloy is generally titanium alloy with the heat treatment strength of more than 1000MPa, and generally comprises α + β two-phase titanium alloy and β type titanium alloy, wherein the β type titanium alloy not only has good cold and hot processing performance, is easy to forge, can be rolled and welded, but also can obtain a plurality of advantages such as higher mechanical property and good matching of strength and fracture toughness through a subsequent solid solution and aging heat treatment process, the TB6 titanium alloy has a nominal chemical composition of Ti-10V-2Fe-3Al, is a typical near β type titanium alloy, has a series of advantages such as high specific strength, good fracture toughness, small anisotropy, low forging temperature, strong stress corrosion resistance and the like, the TB6 titanium alloy is widely applied to key bearing parts of fighters, speed reducers, civilian aircraft, a civil aircrafts and the like, such as F22 hook connecting piece, a B-1B structural part, a structural component, a structural part, a propeller B-2000 landing gear, a propeller strut, a titanium alloy, a propeller strut, a titanium alloy, a bogie, a structural part, a structural steel, a structural part, a bogie, a structural steel, a structural part, a structural.
The TB6 titanium alloy is used as a near β type titanium alloy, when the alloy is rapidly cooled after high-temperature heat preservation, part of β phase can generate β → omega transition to form quenched omega phase, the quenched omega phase has high strength and low plasticity and belongs to a hard brittle phase, although the finely dispersed omega phase can play a role in strengthening a matrix, the plasticity of the alloy is easily and rapidly reduced due to the omega phase, and the plasticity of the alloy can be almost reduced to about zero when the content of the omega phase in the alloy reaches more than 5%.
Disclosure of Invention
The invention aims to provide a method for controlling the structural property uniformity of a high-strength high-plasticity TB6 titanium alloy wire, which comprises the following steps:
step one, heating an electric furnace to the temperature of (T β +20) DEG C to (T β +40) DEG C, loading a TB6 titanium alloy bar with the specification of phi 40 mm-phi 45mm multiplied by 800 mm-1200 mm after the temperature is reached, calculating the heat preservation time according to the diameter of the bar, wherein the heat preservation time is 0.4 min/mm-0.6 min/mm, then carrying out multi-pass hot rolling to the bar with the specification of phi 9 mm-phi 10mm, controlling the hot rolling deformation of each pass to be 40% -50%, air cooling to the room temperature to obtain the bar, and then cutting the bar to a fixed size according to the length of 4000 mm;
step two, heating the electric furnace to (T)β+20)℃～(Tβ+40) DEG C, filling the rods obtained in the step one at the temperature, controlling the number of the rods in each furnace to be 8-10, keeping the temperature for 30min after the temperature of the furnace is raised again, straightening, and then cooling to the room temperature by water;
thirdly, adding the bar material obtained in the second step to phi 7.5-8 mm by using a centerless lathe machine, then cold-rolling to phi 6-7 mm, and controlling the total deformation amount to 15-36% to obtain a wire material;
step four, heating the electric furnace to 520-560 ℃, loading the wire obtained in the step three after the temperature is reached, keeping the temperature for 30-60 min after the temperature of the furnace is reached again, and cooling the wire to room temperature in air.
In the first step, the electric furnace is heated to (T)β+25)℃～(Tβ+35)℃。
In the first step, the electric furnace is heated to (T)β+30)℃。
In the second step, the electric furnace is heated to (T)β+25)℃～(Tβ+35)℃。
In the second step, the electric furnace is heated to (T)β+30)℃。
And the total deformation of the cold rolling in the third step is controlled to be 20-30%.
The total deformation of the cold rolling in the third step is controlled to be 25 percent.
And step four, heating the mixture to 530-550 ℃ by an electric furnace.
And step four, heating the mixture to 535-545 ℃ by an electric furnace.
In the fourth step, the furnace is heated to 540 ℃.
The invention has the advantages and beneficial effects that:
aiming at the phase change characteristic of nearly β type TB6 titanium alloy, the invention carries out one-time pretreatment of a high-temperature β single-phase region before cold rolling, optimizes the preparation process parameters of the TB6 titanium alloy wire by controlling the deformation amount of the cold rolling and combining one-time aging heat treatment after the cold rolling, and obtains the high-strength high-plasticity TB6 titanium alloy wire with the specification of phi 6-phi 7 mm.
The invention reasonably inhibits a large amount of precipitation of omega phase in the TB6 titanium alloy by strictly controlling the hot rolling temperature of the TB6 titanium alloy and the high-temperature β single-phase zone pretreatment temperature before cold rolling, only needs one-time pretreatment before cold rolling, improves the cold rolling deformation capability, simultaneously adopts one-time low-temperature short-time effective treatment after cold rolling, and obtains the phi 6 mm-phi 7mm specification TB6 titanium alloy wire with high room-temperature tensile strength and good plasticity by controlling the precipitation content, morphology and size of the secondary α phase.
The wire prepared by the method has the advantages of high batch stability, good surface quality, high dimensional precision and uniform tissue performance. After aging, room temperature tensile strength sigma of the wirebNot less than 1050MPa, yield strength sigma0.2Not less than 1000MPa, elongation delta5Not less than 15 percent and the reduction of area psi not less than 50 percent.
Detailed Description
Step one, heating an electric furnace to (T)β+20)℃～(Tβ+40) DEG C, loading the bar into a TB6 titanium alloy bar with the specification of phi 40-phi 45mm multiplied by 800 mm-1200 mm after the temperature is up to the temperature, calculating the heat preservation time according to the diameter of the bar, wherein the heat preservation time is 0.4 min/mm-0.6 min/mm, then carrying out multi-pass hot rolling to the bar with the specification of phi 9 mm-phi 10mm, controlling the hot rolling deformation of each pass to be 40-50%, air cooling to the room temperature to obtain the bar, and then cutting the bar to a fixed length according to the length of 4000 mm;
step two, heating the electric furnace to (T)β+20)℃～(Tβ+40) DEG C, filling the rods obtained in the step one at the temperature, controlling the number of the rods in each furnace to be 8-10, keeping the temperature for 30min after the temperature of the furnace is raised again, straightening, and then cooling to the room temperature by water;
thirdly, adding the bar material obtained in the second step to phi 7.5-8 mm by using a centerless lathe machine, then cold-rolling to phi 6-7 mm, and controlling the total deformation amount to 15-36% to obtain a wire material;
step four, heating the electric furnace to 520-560 ℃, loading the wire obtained in the step three after the temperature is reached, keeping the temperature for 30-60 min, and cooling the wire to room temperature in air.
The specific preparation process steps and process parameters of the TB6 titanium alloy wire are detailed in Table 1.
TABLE 1 wire preparation Process steps and Process parameters
Figure BDA0001737754350000031
Example 1
The concrete process steps and process parameters of the TB6 titanium alloy bar (phi 40mm is multiplied by 1200mm) are shown in Table 2, and the performance of the cold-rolled wire after aging is shown in Table 3.
TABLE 2 Process steps and Process parameters (T) for example 1β＝795℃)
Figure BDA0001737754350000032
Figure BDA0001737754350000041
TABLE 3 room temperature tensile Properties of the wire of example 1 after aging
Serial number σb(MPa) σ0.2(MPa) δ5(％) ψ(％)
1 1100 1040 16.8 62.4
2 1090 1035 17.2 65.0
3 1110 1055 16.5 60.0
Example 2
The concrete process steps and process parameters of the TB6 titanium alloy bar (phi 42mm is multiplied by 800mm) are shown in Table 4, and the performance of the cold-rolled wire after aging is shown in Table 5.
Table 4 process steps and process parameters (T) of example 2β＝802℃)
Figure BDA0001737754350000042
TABLE 5 room temperature tensile Properties of the wire of example 2 after aging
Serial number σb(MPa) σ0.2(MPa) δ5(％) ψ(％)
1 1080 1040 17.0 65.5
2 1120 1067 16.6 58.6
3 1100 1060 17.5 68.0
Example 3
The concrete process steps and process parameters of the TB6 titanium alloy bar (phi 45mm is multiplied by 1000mm) are shown in Table 6, and the performance of the cold-rolled wire after aging is shown in Table 7.
TABLE 6 Process steps and Process parameters (T) for example 3β＝793℃)
Figure BDA0001737754350000051
TABLE 7 room temperature tensile properties of the wire of example 3 after aging
Serial number σb(MPa) σ0.2(MPa) δ5(％) ψ(％)
1 1095 1055 17.0 65.5
2 1120 1067 16.6 58.6
3 1100 1060 17.5 68.0
Example 4
The concrete process steps and process parameters of the TB6 titanium alloy bar (phi 42mm is multiplied by 1100mm) are shown in Table 8, and the performance of the cold-rolled wire after aging is shown in Table 9.
TABLE 8 Process steps and Process parameters (T) for example 4β＝807℃)
Figure BDA0001737754350000052
TABLE 9 room temperature tensile properties of the wire of example 4 after aging
Serial number σb(MPa) σ0.2(MPa) δ5(％) ψ(％)
1 1115 1076 16.9 66.8
2 1110 1068 17.3 59.7
3 1095 1059 18.2 64.4
Example 5
The concrete process steps and process parameters of the TB6 titanium alloy bar (phi 45mm is multiplied by 900mm) are shown in Table 10, and the performance of the cold-rolled wire after aging is shown in Table 11.
TABLE 10 Process steps and Process parameters (T) for example 5β＝796℃)
Figure BDA0001737754350000061
TABLE 11 room temperature tensile properties of the wire of example 5 after aging
Serial number σb(MPa) σ0.2(MPa) δ5(％) ψ(％)
1 1100 1053 17.6 60.7
2 1098 1048 18.1 64.5
3 1125 1079 16.9 59.3

Claims (9)

1. A method for controlling the uniformity of the structural properties of a high-strength high-plasticity TB6 titanium alloy wire is characterized by comprising the following steps:
step one, heating an electric furnace to (T)β+25)℃～(Tβ+35) DEG C, loading the bar into a TB6 titanium alloy bar with the specification of phi 40-phi 45mm multiplied by 800 mm-1200 mm after the temperature is up to the temperature, calculating the heat preservation time according to the diameter of the bar, wherein the heat preservation time is 0.4 min/mm-0.6 min/mm, then carrying out multi-pass hot rolling to the bar with the specification of phi 9 mm-phi 10mm, controlling the hot rolling deformation of each pass to be 40% -50%, air cooling to the room temperature to obtain the bar, and then cutting the bar to a fixed length according to the length of 4000 mm;
step two, heating the electric furnace to (T)β+20)℃～(Tβ+40) DEG C, and after the temperature is up, filling the rods obtained in the step one, wherein the number of the rods in each furnace isControlling the number of the steel plates to be 8-10, preserving the heat for 30min after the temperature of the furnace is raised again, straightening, and cooling to room temperature by water;
thirdly, adding the bar material obtained in the second step to phi 7.5-8 mm by using a centerless lathe machine, then cold-rolling to phi 6-7 mm, and controlling the total deformation amount to 15-36% to obtain a wire material;
step four, heating the electric furnace to 520-560 ℃, loading the wire obtained in the step three after the temperature is reached, keeping the temperature for 30-60 min after the temperature of the furnace is reached again, and cooling the wire to room temperature in air.
2. The method for controlling the structural property uniformity of the high-strength high-plasticity TB6 titanium alloy wire according to claim 1, wherein the step one is carried out by heating in an electric furnace to (T)β+30)℃。
3. The method for controlling the structural property uniformity of the high-strength high-plasticity TB6 titanium alloy wire according to claim 1, wherein the step two is carried out by heating in an electric furnace to (T)β+25)℃～(Tβ+35)℃。
4. The method for controlling the structural property uniformity of the high-strength high-plasticity TB6 titanium alloy wire according to claim 1, wherein the step two is carried out by heating in an electric furnace to (T)β+30)℃。
5. The method for controlling the structural property uniformity of the high-strength high-plasticity TB6 titanium alloy wire according to claim 1, wherein the total cold rolling deformation in the third step is controlled to be 20-30%.
6. The method for controlling the structural property uniformity of the high-strength high-plasticity TB6 titanium alloy wire according to claim 1, wherein the total cold rolling deformation in the third step is controlled to be 25%.
7. The method for controlling the structural property uniformity of the high-strength high-plasticity TB6 titanium alloy wire according to claim 1, wherein the four steps are performed by heating in an electric furnace to 530-550 ℃.
8. The method for controlling the structural property uniformity of the high-strength high-plasticity TB6 titanium alloy wire according to claim 1, wherein the four steps are performed by heating in an electric furnace to 535-545 ℃.
9. The method for controlling the structural property uniformity of the high-strength high-plasticity TB6 titanium alloy wire according to claim 1, wherein the four steps are carried out in an electric furnace to be heated to 540 ℃.
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