CN115786767A - High-toughness titanium alloy oil pipe and heat treatment method thereof - Google Patents
High-toughness titanium alloy oil pipe and heat treatment method thereof Download PDFInfo
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- 229910001069 Ti alloy Inorganic materials 0.000 title claims abstract description 176
- 238000010438 heat treatment Methods 0.000 title claims abstract description 68
- 238000000034 method Methods 0.000 title claims abstract description 52
- 230000032683 aging Effects 0.000 claims abstract description 29
- 238000005496 tempering Methods 0.000 claims abstract description 22
- 239000010936 titanium Substances 0.000 claims abstract description 18
- 238000010791 quenching Methods 0.000 claims abstract description 16
- 230000000171 quenching effect Effects 0.000 claims abstract description 16
- 229910052719 titanium Inorganic materials 0.000 claims abstract description 14
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 12
- 239000012535 impurity Substances 0.000 claims abstract description 11
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 10
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 9
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 9
- 229910052763 palladium Inorganic materials 0.000 claims abstract description 8
- 229910052720 vanadium Inorganic materials 0.000 claims abstract description 8
- 229910052742 iron Inorganic materials 0.000 claims abstract description 7
- 229910052729 chemical element Inorganic materials 0.000 claims abstract description 4
- 238000001816 cooling Methods 0.000 claims description 58
- 230000008569 process Effects 0.000 claims description 34
- 239000011159 matrix material Substances 0.000 claims description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 11
- 230000007704 transition Effects 0.000 claims description 4
- 239000006104 solid solution Substances 0.000 abstract description 8
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 abstract description 6
- 239000003345 natural gas Substances 0.000 abstract description 3
- 239000003209 petroleum derivative Substances 0.000 abstract description 2
- 239000000243 solution Substances 0.000 description 25
- 229910045601 alloy Inorganic materials 0.000 description 16
- 239000000956 alloy Substances 0.000 description 16
- KDLHZDBZIXYQEI-UHFFFAOYSA-N palladium Substances [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 description 13
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- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 10
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- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 4
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- 229910052804 chromium Inorganic materials 0.000 description 4
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- VSZWPYCFIRKVQL-UHFFFAOYSA-N selanylidenegallium;selenium Chemical compound [Se].[Se]=[Ga].[Se]=[Ga] VSZWPYCFIRKVQL-UHFFFAOYSA-N 0.000 description 1
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- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 1
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Abstract
The invention relates to the technical field of petroleum and natural gas pipes, in particular to a high-toughness titanium alloy oil pipe and a heat treatment method thereof. A high-toughness titanium alloy oil pipe comprises the following chemical element components in percentage by weight: al:3.5% -4.0%, mo:2.5% -3.5%, cr:3.0% -3.5%, zr: 0.5-0.6 percent of Ti, less than or equal to 0.1 percent of Pd, less than or equal to 0.1 percent of V, less than or equal to 0.015 percent of C, less than or equal to 0.01 percent of H, less than or equal to 0.01 percent of O, less than or equal to 0.05 percent of N, less than or equal to 0.05 percent of Fe, and the balance of Ti and inevitable impurities. The invention can obtain the binary structure of the mixed primary phase and secondary phase by respectively carrying out the two-step heat treatment of solid solution and aging on the titanium alloy oil pipe in the stepping continuous quenching furnace and the stepping continuous tempering furnace, so that the titanium alloy oil pipe has higher strength and toughness.
Description
Technical Field
The invention relates to the technical field of petroleum and natural gas pipes, in particular to a high-toughness titanium alloy oil pipe and a heat treatment method thereof.
Background
Sulfur-containing oil and gas fields in natural gas resources widely distributed in China account for a considerable proportion, and several oil and gas fields in China, such as Sichuan, tarim oil and the like, have high sulfur-containing oil and gas blocks. The titanium alloy has high strength, low density, excellent corrosion resistance and high fatigue resistance, and the strength of the titanium alloy is still higher even if the service temperature is as high as 260 ℃, so the titanium alloy is beneficial to the application of the titanium alloy in deep wells, ultra-deep wells and oil and gas wells under severe corrosion conditions. Therefore, the titanium alloy oil gas pipe becomes one of the selectable pipes for deep oil gas development in China.
The titanium alloy pipe is used as a novel corrosion-resistant oil pipe, the toughness index of the pipe generally adopts the specification of a standard P110 steel-grade oil pipe such as a universal petroleum casing API 5CT or GB/T19830 and the like on the toughness: the machine direction was 41J at 0 ℃. Or adopting standard SY/T6896.3-2016 of titanium alloy oil pipe to meet the requirement of impact energy of P110 steel grade titanium alloy oil pipe: the longitudinal direction at-10 ℃ was 41J. However, although the impact toughness index of the titanium alloy oil pipe in the current market meets the standard requirement, the actual value of the impact energy often deviates from the threshold value of the standard requirement, and the impact toughness of the oil pipe in the common steel or nickel-based alloy in the market is obviously lower. Because the material properties of the titanium alloy pipe are greatly different from those of oil pipes made of steel, nickel-based alloy and the like, the performance indexes adopting the product standards in the market still have failure problems or risks in the actual application process, and the requirement of better strength matching in the service environment cannot be met.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide a tough titanium alloy oil tube and a heat treatment method thereof, in which a binary structure formed by mixing a primary phase and a secondary phase can be obtained by performing two-step heat treatment of solution treatment and aging treatment on the titanium alloy oil tube, so that the titanium alloy oil tube has high strength and toughness that satisfy the use conditions.
The technical scheme of the invention is as follows: the high-toughness titanium alloy oil pipe comprises the following chemical element components in percentage by weight: al:3.5% -4.0%, mo:2.5% -3.5%, cr:3.0% -3.5%, zr: 0.5-0.6 percent of Ti and inevitable impurities, less than or equal to 0.1 percent of Pd, less than or equal to 0.1 percent of V, less than or equal to 0.015 percent of C, less than or equal to 0.01 percent of H, less than or equal to 0.01 percent of O, less than or equal to 0.05 percent of N, less than or equal to 0.05 percent of Fe, and the balance of Ti and inevitable impurities.
The selection basis of the chemical components of the high-toughness titanium alloy oil pipe is as follows:
the design ranges of aluminum (Al), molybdenum (Mo), chromium (Cr), zirconium (Zr), palladium (Pd) and vanadium (V): 3.5-4.0% of Al and 2.5-4.0% of Mo3.5 percent, 3.0 to 3.5 percent of Cr, 0.5 to 0.6 percent of Zr, less than or equal to 0.1 percent of Pd and less than or equal to 0.1 percent of V. The reason is as follows: the Al element mainly has a solid solution strengthening effect, stabilizes an alpha phase, improves the specific strength of the alloy and improves the heat resistance; if the Al element content is too high, ti is easily formed 3 Al brittle phase, which reduces the mechanical properties of the material. Mo and V are beta stable elements and mainly play a role in solid solution strengthening beta phase, so that the phase change point is reduced, the hardenability is increased, and the Mo element can also improve the corrosion resistance of the titanium alloy. The Cr element mainly acts as a strengthening element, stabilizes a beta phase, and is added with Mo to inhibit eutectoid. Zr is a neutral element, mainly plays a role in solid solution strengthening and further improves the heat strength. Pd element improves the corrosion resistance of the titanium alloy and enlarges the passivation range of the titanium alloy. The control range of the alloy elements designed by the invention is beneficial to improving the properties of the titanium alloy such as strength, toughness, corrosion and the like; on the other hand, the hot processing performance of the material is improved.
The content of carbon (C), oxygen (O), nitrogen (N), hydrogen (H) and iron (Fe) impurity elements is strictly controlled: less than or equal to 0.015 percent of C, less than or equal to 0.01 percent of H, less than or equal to 0.01 percent of O, less than or equal to 0.05 percent of N and less than or equal to 0.05 percent of Fe. The reason is as follows: o, N and C are common impurity elements in the titanium alloy, and can improve the strength of the titanium and reduce the plasticity of the titanium; however, a certain content of O element contributes to the improvement of the tensile strength of the alloy, so that the content of O cannot be too low. When the content of the H element in the titanium alloy reaches a certain amount, the sensitivity of the titanium alloy to the notch is greatly improved, so that the performances of the notch sample, such as impact toughness, are sharply reduced. The Fe element is an important alloy element of the metastable beta titanium alloy and can obviously reduce the martensitic transformation temperature of the titanium alloy. The control range of the impurity elements designed by the invention is beneficial to reducing the influence of the impurity elements such as C, H, O, N, fe and the like on the performance of the titanium alloy by the heat treatment process; on the other hand, the heat treatment temperature parameter is reduced.
The titanium alloy oil pipe is a cold-rolled titanium alloy oil pipe, the rolled structure of the tube blank of the cold-rolled titanium alloy oil pipe is that equiaxial alpha phase and reticular alpha phase are distributed on a beta phase matrix, and the content of the alpha phase is less than or equal to 30%.
In the rolling structure of the cold-rolled titanium alloy oil pipe blank, titanium with a close-packed hexagonal structure is called an alpha phase, titanium with a body-centered cubic structure is called a beta phase, and the two phases are simultaneously called an alpha + beta double phase. The processing technology of the cold-rolled titanium alloy oil pipe blank adopts a mature titanium alloy manufacturing technology, and the basic flow of the technology is sponge titanium → smelting → titanium ingot → forging → hot perforation → rolling → acid washing → annealing → continuous cold rolling → surface polishing → heat treatment blank. Since the alpha phase proportion is generally increased in the alpha + beta type titanium alloy, the plasticity and the toughness of the alloy are increased, and the strength of the alloy is reduced, the alpha phase content is controlled not to exceed 30%, and the high strength and the high plasticity and toughness of the titanium alloy are realized through subsequent heat treatment.
A heat treatment method of a high-toughness titanium alloy oil pipe comprises the following steps:
s1: carrying out solution treatment on a titanium alloy oil pipe blank; the specific process is as follows:
heating the rolled titanium alloy oil pipe blank to a beta-phase transition temperature T in a stepping continuous quenching furnace β Keeping the temperature of 30-110 ℃ for 1-2 hours, and then cooling to room temperature by adopting a water cooling mode;
s2: carrying out aging treatment on the titanium alloy oil pipe blank; the specific process is as follows:
heating the titanium alloy oil pipe blank cooled after the solution treatment in the S1 to 560 ℃ to 600 ℃ in a stepping continuous tempering furnace, and preserving the heat for 2 to 8 hours;
s3: carrying out hot car straightening treatment on the titanium alloy oil pipe blank; the specific process is as follows:
and (3) conveying the titanium alloy oil pipe blank subjected to aging treatment by the step-type continuous tempering furnace in the step S2 to a straightening machine through a roller way for hot straightening at the straightening temperature of more than 450 ℃, and then cooling to room temperature on a cooling bed in an air cooling mode.
The titanium alloy oil pipe blank in the S1 is a cold-rolled titanium alloy pipe, the rolled structure of the titanium alloy oil pipe blank in the S1 is that equiaxial alpha phase and reticular alpha phase are distributed on a beta phase matrix, and the content of the alpha phase is less than or equal to 30%.
In the S1, the titanium alloy oil pipe blank is subjected to solution treatment, and the rolled titanium alloy oil pipe blank is heated to the heating temperature of 830-910 ℃ in a stepping continuous quenching furnace.
The heating speed in the heating process of the stepping continuous quenching furnace in the S1 is 20 to 25 ℃/min.
And in the S2, the heating speed in the heating process of the stepping continuous tempering furnace is 20 to 25 ℃/min.
The structure form of the titanium alloy oil pipe blank after the aging treatment process in S2 is that discontinuous spherical alpha phase, rod-shaped alpha phase and needle-shaped alpha phase are distributed on a beta phase matrix, and the content of the alpha phase is less than or equal to 30 percent.
The content of the spherical alpha phase is more than 10 percent.
After the aging treatment process in S2, the yield strength of the titanium alloy oil pipe blank ranges from 855MPa to 880MPa, the tensile strength ranges from 930MPa to 950MPa, and the full-size impact power ranges from 56J to 73J at the temperature of-10 ℃.
The invention has the beneficial effects that: 1. according to the invention, through carrying out solution treatment on the titanium alloy oil pipe blank, when the temperature of the material is raised to an alpha + beta two-phase region, due to the existence of elements (such as Al) for stabilizing the alpha phase, the alpha phase with higher content and larger size is retained, the rest is converted into the beta phase, and the retained alpha phase is matched as a primary alpha phase. Because the beta phase is a high-temperature phase, a strip-shaped, needle-shaped and other alpha phases can be separated out due to instability in the subsequent cooling process, and the alpha phase is called as a secondary alpha phase. When the titanium alloy oil pipe blank is subjected to solution treatment, the size, the form and the distribution of a primary alpha phase are controlled through an alpha + beta dual-phase area, the rapid growth of beta-phase crystal grains is avoided, a dual-state structure formed by mixing the primary phase and a secondary phase can be obtained, and the titanium alloy oil pipe blank has high strength and toughness meeting use conditions; 2. the aging treatment temperature is selected to be in a relatively high temperature range of 560-600 ℃, and in the range, secondary alpha phase is fine and needle-shaped during the aging treatment, flaky alpha phase does not appear, dislocation motion can be blocked, the strength of the alloy is improved, meanwhile, a small amount of alpha phase is attached to the spherical alpha phase, the content of the spherical alpha phase is increased, the size of the spherical alpha phase is increased, and the plasticity and the toughness of the titanium alloy are improved to a certain degree; 3. compared with the traditional solid solution aging process, the invention can effectively regulate and control the contents and sizes of spherical alpha phase, rod-shaped alpha phase and needle-shaped alpha phase in the microstructure of the titanium alloy oil pipe by reasonably selecting process parameters on the basis of comprehensively considering parameters such as heat treatment temperature, heating mode, heat preservation time, cooling mode and the like, thereby realizing good matching among strength, plasticity and toughness; the process flow is suitable for factory batch production equipment, and the process is simple and stable and is convenient to operate.
Drawings
FIG. 1 is a titanium alloy oil pipe microstructure in example 2 of the present invention.
FIG. 2 is the microstructure of the titanium alloy oil pipe in example 3 of the present invention.
FIG. 3 is the microstructure of the titanium alloy oil pipe in example 4 of the present invention.
FIG. 4 is a microstructure of a titanium alloy oil pipe in example 5 of the present invention.
FIG. 5 is a microstructure of a titanium alloy oil pipe in example 6 of the present invention.
FIG. 6 is a microstructure of a titanium alloy oil pipe in example 7 of the present invention.
Detailed Description
The present invention is described in further detail below with reference to examples:
example 1
The high-toughness titanium alloy oil pipe comprises the following chemical element components in percentage by weight: al:3.5% -4.0%, mo:2.5% -3.5%, cr:3.0% -3.5%, zr: 0.5-0.6 percent of Ti and inevitable impurities, less than or equal to 0.1 percent of Pd, less than or equal to 0.1 percent of V, less than or equal to 0.015 percent of C, less than or equal to 0.01 percent of H, less than or equal to 0.01 percent of O, less than or equal to 0.05 percent of N, less than or equal to 0.05 percent of Fe, and the balance of Ti and inevitable impurities.
The titanium alloy oil pipe is a cold-rolled titanium alloy oil pipe, the rolled structure of the tube blank of the cold-rolled titanium alloy oil pipe is that equiaxial alpha phase and reticular alpha phase are distributed on a beta phase matrix, and the content of the alpha phase is less than or equal to 30%.
In the rolling structure of the cold-rolled titanium alloy oil pipe blank, titanium with a close-packed hexagonal structure is called as an alpha phase, titanium with a body-centered cubic structure is called as a beta phase, and the two phases are simultaneously called as an alpha + beta double phase. The processing technology of the cold-rolled titanium alloy oil pipe blank adopts a mature titanium alloy manufacturing technology, and the basic flow is sponge titanium → smelting → titanium ingot → forging → hot perforation → rolling → acid washing → annealing → continuous cold rolling → surface polishing → heat treatment of the blank. Since the alpha phase proportion is generally increased in the alpha + beta type titanium alloy, the plasticity and the toughness of the alloy are increased, and the strength of the alloy is reduced, the alpha phase content is controlled not to exceed 30%, and the high strength and the high plasticity and toughness of the titanium alloy are realized through subsequent heat treatment.
A heat treatment method of a high-toughness titanium alloy oil pipe comprises the following steps:
s1: carrying out solution treatment on a titanium alloy oil pipe blank; the specific process is as follows:
heating the rolled titanium alloy oil pipe blank to a beta-phase transition temperature T in a stepping continuous quenching furnace β Keeping the temperature at 30-110 ℃ for 1-2 hours, and then cooling to room temperature by adopting a water cooling mode;
s2: carrying out aging treatment on the titanium alloy oil pipe blank; the specific process is as follows:
heating the titanium alloy oil pipe blank cooled after the solution treatment in the S1 to 560 ℃ to 600 ℃ in a stepping continuous tempering furnace, and preserving the heat for 2 to 8 hours;
s3: carrying out hot car straightening treatment on the titanium alloy oil pipe blank; the specific process is as follows:
and (3) conveying the titanium alloy oil pipe subjected to aging treatment in the step-type continuous tempering furnace in the step S2 to a straightening machine through a roller way for hot straightening at the straightening temperature of more than 450 ℃, and then cooling to room temperature on a cooling bed in an air cooling mode.
The titanium alloy oil pipe blank in the S1 is a cold-rolled titanium alloy pipe, the rolled structure of the titanium alloy oil pipe blank in the S1 is equiaxial alpha phase and reticular alpha phase distributed on a beta phase matrix, and the content of the alpha phase is less than or equal to 30 percent.
In the S1, the titanium alloy oil pipe blank is subjected to solution treatment, and the rolled titanium alloy oil pipe blank is heated to the heating temperature of 830-910 ℃ in a stepping continuous quenching furnace.
And in the S1, the heating speed is 20 to 25 ℃/min in the heating process of the stepping continuous quenching furnace.
And in the S2, the heating speed in the heating process of the stepping continuous tempering furnace is 20 to 25 ℃/min.
The structure form of the titanium alloy oil pipe blank after the aging treatment process in S2 is that discontinuous spherical alpha phase, rod-shaped alpha phase and needle-shaped alpha phase are distributed on a beta phase matrix, the content of the alpha phase is less than or equal to 30 percent, wherein the content of the spherical alpha phase is more than 10 percent.
After the aging treatment process in S2, the yield strength of the titanium alloy oil pipe blank ranges from 855MPa to 880MPa, the tensile strength ranges from 930MPa to 950MPa, and the full-size impact power ranges from 56J to 73J at-10 ℃.
The heat treatment method of the invention has the solid solution treatment temperature in a two-phase region of an alpha + beta phase diagram of the titanium alloy, wherein the alpha phase is a low-temperature phase, the beta phase is a high-temperature phase, and the transition temperature T of the beta phase is β And (3) converting the excessive phase alpha phase into a beta phase during heat preservation and solution treatment at the temperature of 30-110 ℃, wherein the solubility of the alloy elements with the strengthening effect is different at high temperature and low temperature, and the alloy elements cannot be separated out during subsequent rapid water cooling to form a supersaturated solid solution. The specific process is as follows: when the temperature of the titanium alloy oil pipe blank rises to a beta 0+ beta 4 two-phase region, a beta 2 phase with higher content and larger size is reserved due to the existence of elements (such as Al) for stabilizing the beta 1 phase, the rest is converted into a beta 6 phase, and the reserved beta 3 phase is matched as a primary beta 5 phase. Because the beta 8 phase is a high-temperature phase, a strip-shaped or needle-shaped beta 7 phase can be separated out due to instability in the subsequent cooling process, and the alpha phase is called a secondary alpha 0 phase. When the titanium alloy oil pipe blank is subjected to solution treatment, the size, the form and the distribution of a primary alpha 3 phase are controlled through an alpha 1+ beta 9 two-phase region, the rapid growth of alpha 2 phase crystal grains is avoided, a two-state structure formed by mixing a primary phase and a secondary phase can be obtained, and the titanium alloy oil pipe blank has high strength and toughness meeting use conditions. Because the solution treatment is carried out in the alpha 4+ alpha 6 two-phase region, equiaxial alpha 5 phase and reticular alpha 8 phase are distributed on the alpha 7 phase matrix of the cold-rolled titanium alloy oil pipe blank in the solution process, and can be partially converted to beta phase at high temperature, and the original equiaxial alpha 9 phase and reticular beta 0 phase are partially converted into small and discontinuous spherical beta 1 phase in the conversion process. And the subsequent reasonable aging temperature is selected, so that the metastable beta phase which is not transformed in the water cooling process can be decomposed, and the beta phase is transformed into a needle-shaped beta 2 phase and a rod-shaped beta 3 phase. Because the formed spherical beta 4 phase, rod-shaped alpha phase and needle-shaped alpha phase have different capabilities of passivating and hindering the crack tip in the crack propagation process, the spherical alpha phase is controlled to strengthen the bifurcation or passivation of the crack tip, the needle-shaped phase and rod-shaped alpha phase are controlled to strengthen the crack tip propagation deflection, and the tortuosity and the negative force of the crack are increased, so that the toughness of the material is improved.
The aging treatment temperature of the invention is selected to be in a relatively higher temperature range of 560 ℃ to 600 ℃, and in the temperature range, the secondary alpha phase is fine and needle-shaped during the aging treatment, and a flaky alpha phase does not appear, so that the dislocation motion can be hindered, the strength of the alloy is improved, and a small amount of alpha phase can be attached to a spherical alpha phase, so that the content of the spherical alpha phase is increased, the size is increased, and the plasticity and the toughness of the titanium alloy are improved to a certain extent. Compared with the traditional solid solution aging process, the invention can effectively regulate and control the contents and sizes of spherical alpha phase, rod-shaped alpha phase and needle-shaped alpha phase in the microstructure of the titanium alloy oil pipe by reasonably selecting process parameters on the basis of comprehensively considering parameters such as heat treatment temperature, heating mode, heat preservation time, cooling mode and the like, thereby realizing good matching among strength, plasticity and toughness; the process flow is suitable for factory batch production equipment, and the process is simple and stable and is convenient to operate.
Example 2
In the embodiment 2, a titanium alloy oil pipe blank with the specification of phi 88.9 multiplied by 7.34mm is adopted, and the titanium alloy oil pipe blank is a cold-rolled titanium alloy pipe. The titanium alloy oil pipe blank contains 0.1% of V, 3.8% of Al, 3% of Mo, 3.5% of Cr, 0.55% of Zr, 0.08% of Pd, 0.015% of C, 0.01% of H, 0.01% of O, 0.05% of N and 0.05% of Fe. The rolled structure of the titanium alloy oil pipe blank is that equiaxial alpha phase and reticular alpha phase are distributed on a beta phase matrix, and the content of the alpha phase is less than or equal to 30 percent.
S1: heating the titanium alloy oil pipe blank with the specification of phi 88.9 multiplied by 7.34mm to 910 ℃ in a stepping continuous quenching furnace for solution treatment, keeping the temperature for 1h, raising the temperature at the speed of 21 ℃/min, and then cooling to the room temperature by adopting a water cooling mode;
s2: and (3) heating the titanium alloy oil pipe blank subjected to the solution treatment in the S1 to 560 ℃ in a stepping continuous tempering furnace for aging treatment, wherein the heat preservation time is 4h, and the temperature rise speed is 21 ℃/min.
S3: after aging treatment of a stepping continuous tempering furnace, conveying the titanium alloy oil pipe blank into a straightening machine through a roller way for hot straightening at the straightening temperature of 455 ℃, and then cooling the titanium alloy oil pipe blank to room temperature on a cooling bed in an air cooling mode.
Example 3
In example 3, a titanium alloy oil pipe blank with a specification of phi 88.9 × 7.34mm was used, and the titanium alloy oil pipe blank was a cold-rolled titanium alloy pipe. The titanium alloy oil pipe blank contains 0.1% of V, 3.8% of Al, 3% of Mo, 3.0% of Cr, 0.6% of Zr, 0.08% of Pd, 0.012% of C, 0.01% of H, 0.008% of O, 0.05% of N and 0.02% of Fe. The rolled structure of the titanium alloy oil pipe blank is that equiaxial alpha phase and reticular alpha phase are distributed on a beta phase matrix, and the content of the alpha phase is less than or equal to 30 percent.
S1: heating a titanium alloy oil pipe blank with the specification of phi 88.9 multiplied by 7.34mm to 910 ℃ in a stepping continuous quenching furnace for solution treatment, keeping the temperature for 1h, raising the temperature at 22 ℃/min, and then cooling to room temperature in a water cooling mode;
s2: and (3) heating the titanium alloy oil pipe blank subjected to the solution treatment in the step-by-step continuous tempering furnace to 580 ℃ for aging treatment, wherein the heat preservation time is 4h, and the temperature rise speed is 22 ℃/min.
S3: after aging treatment of a stepping continuous tempering furnace, conveying the titanium alloy oil pipe blank into a straightening machine through a roller way to perform hot straightening at the straightening temperature of 475 ℃, and then cooling the titanium alloy oil pipe blank to room temperature on a cooling bed in an air cooling mode.
Example 4
In example 4, a titanium alloy oil pipe blank with a specification of phi 88.9 × 7.34mm was used, and the titanium alloy oil pipe blank was a cold-rolled titanium alloy pipe. The titanium alloy oil pipe blank contains 0.08 percent of V, 3.5 percent of Al, 3.5 percent of Mo, 3.5 percent of Cr, 0.6 percent of Zr, 0.07 percent of Pd, 0.010 percent of C, 0.01 percent of H, 0.008 percent of O, 0.03 percent of N and 0.04 percent of Fe. The rolled structure of the titanium alloy oil pipe blank is that equiaxial alpha phase and reticular alpha phase are distributed on a beta phase matrix, and the content of the alpha phase is less than or equal to 30 percent.
S1: heating the titanium alloy oil pipe blank with the specification of phi 88.9 multiplied by 7.34mm to 910 ℃ in a stepping continuous quenching furnace for solution treatment, keeping the temperature for 1h, raising the temperature at the speed of 23 ℃/min, and then cooling to the room temperature by adopting a water cooling mode;
s2: and (3) heating the titanium alloy oil pipe blank subjected to the solution treatment in the step S1 to 600 ℃ in a stepping continuous tempering furnace for aging treatment, keeping the temperature for 4h, and cooling to room temperature in an air cooling mode, wherein the temperature rise speed is 23 ℃/min.
S3: after the aging treatment of the stepping continuous tempering furnace, the titanium alloy oil pipe blank is conveyed into a straightening machine through a roller way to be subjected to hot straightening at the straightening temperature of 485 ℃, and then is cooled to room temperature on a cooling bed in an air cooling mode.
Example 5
In example 5, a titanium alloy oil pipe blank with a specification of phi 88.9 × 7.34mm was used, and the titanium alloy oil pipe blank was a cold-rolled titanium alloy pipe. The titanium alloy oil pipe blank contains 0.06% of V, 4.0% of Al, 2.5% of Mo, 3.0% of Cr, 0.6% of Zr, 0.08% of Pd, 0.012% of C, 0.01% of H, 0.01% of O, 0.04% of N and 0.05% of Fe. The rolled structure of the titanium alloy oil pipe blank is that equiaxial alpha phase and reticular alpha phase are distributed on a beta phase matrix, and the content of the alpha phase is less than or equal to 30 percent.
S1: heating a titanium alloy oil pipe blank with the specification of phi 88.9 multiplied by 7.34mm to 910 ℃ in a stepping continuous quenching furnace for solution treatment, keeping the temperature for 1h, raising the temperature at 24 ℃/min, and then cooling to room temperature in a water cooling mode;
s2: and (3) heating the titanium alloy oil pipe blank subjected to the solution treatment in the S1 to 560 ℃ in a stepping continuous tempering furnace for aging treatment, keeping the temperature for 2h, raising the temperature at a speed of 24 ℃/min, and then cooling to room temperature in an air cooling mode.
S3: after aging treatment of a stepping continuous tempering furnace, conveying the titanium alloy oil pipe blank into a straightening machine through a roller way for hot straightening at the straightening temperature of 500 ℃, and then cooling the titanium alloy oil pipe blank to room temperature on a cooling bed in an air cooling mode.
Example 6
In example 6, a titanium alloy oil pipe blank with a specification of phi 88.9 x 7.34mm was used, and the titanium alloy oil pipe blank was a cold-rolled titanium alloy pipe. The titanium alloy oil pipe blank contains 0.1% of V, 3.6% of Al, 3.2% of Mo, 3.3% of Cr, 0.5% of Zr, 0.09% of Pd, 0.012% of C, 0.008% of H, 0.01% of O, 0.04% of N and 0.04% of Fe. The rolled structure of the titanium alloy oil pipe blank is that equiaxial alpha phase and reticular alpha phase are distributed on a beta phase matrix, and the content of the alpha phase is less than or equal to 30 percent.
S1: heating a titanium alloy oil pipe blank with the specification of phi 88.9 multiplied by 7.34mm to 910 ℃ in a stepping continuous quenching furnace for solution treatment, keeping the temperature for 1h, raising the temperature at 20 ℃/min, and then cooling to room temperature in a water cooling mode;
s2: and (3) heating the titanium alloy oil pipe blank subjected to the solution treatment in the step-by-step continuous tempering furnace to 560 ℃ for aging treatment, keeping the temperature for 8h, raising the temperature at a speed of 20 ℃/min, and then cooling to room temperature in an air cooling mode.
S3: after aging treatment of a stepping continuous tempering furnace, conveying the titanium alloy oil pipe blank into a straightening machine through a roller way for hot straightening at the straightening temperature of 460 ℃, and then cooling to room temperature on a cooling bed in an air cooling mode.
Example 7
In example 7, a titanium alloy oil pipe blank with a specification of phi 88.9 × 7.34mm was used, and the titanium alloy oil pipe blank was a cold-rolled titanium alloy pipe. The titanium alloy oil pipe blank contains 0.05 percent of V, 4.0 percent of Al, 2.5 percent of Mo, 3.5 percent of Cr, 0.5 percent of Zr, 0.08 percent of Pd, 0.010 percent of C, 0.005 percent of H, 0.008 percent of O, 0.04 percent of N and 0.03 percent of Fe. The rolled structure of the titanium alloy oil pipe blank is that equiaxial alpha phase and reticular alpha phase are distributed on a beta phase matrix, and the content of the alpha phase is less than or equal to 30 percent.
S1: heating the titanium alloy oil pipe blank with the specification of phi 88.9 multiplied by 7.34mm to 830 ℃ in a stepping continuous quenching furnace for solution treatment, keeping the temperature for 2 hours, raising the temperature at 20 ℃/min, and then cooling to room temperature in a water cooling mode;
s2: and (3) heating the titanium alloy oil pipe blank subjected to the solution treatment in the step S1 to 560 ℃ in a stepping continuous tempering furnace for aging treatment, keeping the temperature for 4h, raising the temperature at a speed of 20 ℃/min, and then cooling to room temperature in an air cooling mode.
S3: after aging treatment of a stepping continuous tempering furnace, conveying the titanium alloy oil pipe blank into a straightening machine through a roller way for hot straightening at the straightening temperature of 455 ℃, and then cooling the titanium alloy oil pipe blank to room temperature on a cooling bed in an air cooling mode.
The heat treatment processes in examples 2 to 7 and the toughness of the titanium alloy oil pipe blank after heat treatment are shown in table 1, wherein three test samples are taken for testing the tensile strength, the yield strength and the toughness of each example, and the average value of the three test samples is taken as a result and recorded in table 1. As can be seen from Table 1, the titanium alloy oil pipe blank has a yield strength of 855MPa to 880MPa, a tensile strength of 930MPa to 950MPa, and a full-scale impact energy of 56J to 73J at-10 ℃. Comparing with Table 2, the yield strength range of the tube blank before the heat treatment process is 790MPa to 825MPa, the tensile strength is 865MPa to 910MPa, and the minimum value of the full-size impact energy is 45J at minus 10 ℃; after heat treatment, the yield strength range of the tube blank is 855MPa to 880MPa, the tensile strength is 930MPa to 950MPa, the minimum value of full-size impact power is 56J at minus 10 ℃, the minimum value of the actual yield strength is about 8%, the minimum value of the tensile strength is more than or equal to 930MPa, the minimum value of the full-size impact toughness is improved by more than 20%, and good obdurability matching of the titanium alloy tube is realized.
Fig. 1 to 6 show the microstructure of the titanium alloy oil pipes in examples 2 to 7 of the present invention, and it can be seen from the figures that, with different temperature and time parameter processes, the α phase is mainly a spherical α phase, and also a rod-shaped α phase, a needle-shaped α phase and a strip-shaped α phase are equal, and no flaky α phase appears, wherein the α phase in fig. 1 is 14.1%, the α phase in fig. 2 is 15.9%, the α phase in fig. 3 is 17.5%, the α phase in fig. 4 is 11.5%, the α phase in fig. 5 is 14.8%, and the α phase in fig. 6 is 25.2%. The temperature range of the aging treatment is selected to be relatively higher from 560 ℃ to 600 ℃, so that secondary alpha phase precipitated secondarily is fine and needle-shaped during the aging treatment, and flaky alpha phase does not appear, so that dislocation movement is hindered, the strength of the alloy is improved, a small amount of alpha phase can be attached to the spherical alpha phase, the content and the size of the spherical alpha phase are increased, and the plasticity and the toughness of the titanium alloy are improved to a certain extent.
TABLE 1 Heat treatment process and strength of titanium alloy oil pipe blank
TABLE 2 Strength of titanium alloy oil pipe blank before Heat treatment
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention.
Claims (9)
1. A high-toughness titanium alloy oil pipe is characterized in that: the titanium alloy oil pipe comprises the following chemical element components in percentage by weight: al:3.5% -4.0%, mo:2.5% -3.5%, cr:3.0% -3.5%, zr: 0.5-0.6 percent of Ti and inevitable impurities, less than or equal to 0.1 percent of Pd, less than or equal to 0.1 percent of V, less than or equal to 0.015 percent of C, less than or equal to 0.01 percent of H, less than or equal to 0.01 percent of O, less than or equal to 0.05 percent of N, less than or equal to 0.05 percent of Fe, and the balance of Ti and inevitable impurities.
2. The high-toughness titanium alloy oil pipe as claimed in claim 1, wherein: the titanium alloy oil pipe is a cold-rolled titanium alloy oil pipe, the rolled structure of the tube blank of the cold-rolled titanium alloy oil pipe is that equiaxial alpha phase and reticular alpha phase are distributed on a beta phase matrix, and the content of the alpha phase is less than or equal to 30%.
3. The heat treatment method of the tough titanium alloy oil pipe according to claim 1, characterized in that: the method comprises the following steps:
s1: carrying out solution treatment on a titanium alloy oil pipe blank; the specific process is as follows:
heating the titanium alloy oil pipe blank to the beta phase transition temperature T in a stepping continuous quenching furnace β Keeping the temperature at 30-110 ℃ for 1-2 hours, and then cooling to room temperature by adopting a water cooling mode;
s2: carrying out aging treatment on the titanium alloy oil pipe blank; the specific process is as follows:
heating the titanium alloy oil pipe blank cooled after the solution treatment in the S1 to 560 ℃ to 600 ℃ in a stepping continuous tempering furnace, and preserving the heat for 2 to 8 hours;
s3: carrying out hot car straightening treatment on the titanium alloy oil pipe blank; the specific process is as follows:
and (3) conveying the titanium alloy oil pipe blank subjected to the aging treatment of the step-type continuous tempering furnace in the step S2 to a straightening machine through a roller way for hot straightening at the straightening temperature of more than 450 ℃, and then cooling to room temperature on a cooling bed in an air cooling mode.
4. The heat treatment method of the high-toughness titanium alloy oil pipe as claimed in claim 3, wherein the heat treatment method comprises the following steps: in the S1, the titanium alloy oil pipe blank is subjected to solution treatment, and the rolled titanium alloy oil pipe blank is heated to the heating temperature of 830-910 ℃ in a stepping continuous quenching furnace.
5. The heat treatment method of the tough titanium alloy oil pipe according to claim 3, characterized in that: the heating speed in the heating process of the stepping continuous quenching furnace in the S1 is 20 to 25 ℃/min.
6. The heat treatment method of the tough titanium alloy oil pipe according to claim 3, characterized in that: and in the S2, the heating speed in the heating process of the stepping continuous tempering furnace is 20 to 25 ℃/min.
7. The heat treatment method of the tough titanium alloy oil pipe according to claim 3, characterized in that: the structure form of the titanium alloy oil pipe blank after the aging treatment process in S2 is that discontinuous spherical alpha phase, rod-shaped alpha phase and needle-shaped alpha phase are distributed on a beta phase matrix, and the content of the alpha phase is less than or equal to 30 percent.
8. The heat treatment method of the tough titanium alloy oil pipe according to claim 7, characterized in that: the globular alpha phase content is >10%.
9. The heat treatment method of the high-toughness titanium alloy oil pipe as claimed in claim 3, wherein the heat treatment method comprises the following steps: after the aging treatment process in S2, the yield strength of the titanium alloy oil pipe blank ranges from 855MPa to 880MPa, the tensile strength ranges from 930MPa to 950MPa, and the full-size impact power ranges from 56J to 73J at-10 ℃.
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005320570A (en) * | 2004-05-07 | 2005-11-17 | Kobe Steel Ltd | alpha-beta TITANIUM ALLOY WITH EXCELLENT MACHINABILITY |
| CN103924180A (en) * | 2014-04-08 | 2014-07-16 | 中南大学 | Thermal treatment method for TC18 titanium alloy |
| CN105369061A (en) * | 2014-08-11 | 2016-03-02 | 张忠世 | Titanium alloy BT14 seamless tube and preparation method thereof |
| CN108098269A (en) * | 2017-12-18 | 2018-06-01 | 西安赛特思迈钛业有限公司 | A kind of preparation for processing of high intensity high-precision Ti6Al4V titanium alloy pipes |
| CN108913943A (en) * | 2018-08-03 | 2018-11-30 | 燕山大学 | Tough titanium alloy of a kind of nearly α phase height and preparation method thereof |
| CN110983102A (en) * | 2019-12-02 | 2020-04-10 | 中国石油天然气集团有限公司 | Titanium alloy oil pipe and manufacturing method thereof |
-
2021
- 2021-09-10 CN CN202111064355.3A patent/CN115786767B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005320570A (en) * | 2004-05-07 | 2005-11-17 | Kobe Steel Ltd | alpha-beta TITANIUM ALLOY WITH EXCELLENT MACHINABILITY |
| CN103924180A (en) * | 2014-04-08 | 2014-07-16 | 中南大学 | Thermal treatment method for TC18 titanium alloy |
| CN105369061A (en) * | 2014-08-11 | 2016-03-02 | 张忠世 | Titanium alloy BT14 seamless tube and preparation method thereof |
| CN108098269A (en) * | 2017-12-18 | 2018-06-01 | 西安赛特思迈钛业有限公司 | A kind of preparation for processing of high intensity high-precision Ti6Al4V titanium alloy pipes |
| CN108913943A (en) * | 2018-08-03 | 2018-11-30 | 燕山大学 | Tough titanium alloy of a kind of nearly α phase height and preparation method thereof |
| CN110983102A (en) * | 2019-12-02 | 2020-04-10 | 中国石油天然气集团有限公司 | Titanium alloy oil pipe and manufacturing method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 王成焘等: "《骨科植入物工程学（上册）》", 上海交通大学出版社, pages: 356 * |
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