CN115233035A - High-strength corrosion-resistant titanium alloy and preparation method thereof - Google Patents
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- 229910001069 Ti alloy Inorganic materials 0.000 title claims abstract description 93
- 230000007797 corrosion Effects 0.000 title claims abstract description 55
- 238000005260 corrosion Methods 0.000 title claims abstract description 55
- 238000002360 preparation method Methods 0.000 title abstract description 7
- 238000005242 forging Methods 0.000 claims abstract description 14
- 239000010936 titanium Substances 0.000 claims abstract description 11
- 239000012535 impurity Substances 0.000 claims abstract description 9
- 229910052726 zirconium Inorganic materials 0.000 claims abstract description 9
- 238000005520 cutting process Methods 0.000 claims abstract description 6
- 238000002844 melting Methods 0.000 claims abstract description 6
- 230000008018 melting Effects 0.000 claims abstract description 6
- 238000003825 pressing Methods 0.000 claims abstract description 5
- 238000005096 rolling process Methods 0.000 claims abstract description 5
- 239000011651 chromium Substances 0.000 claims description 15
- 238000010438 heat treatment Methods 0.000 claims description 13
- 238000000034 method Methods 0.000 claims description 12
- 238000001816 cooling Methods 0.000 claims description 7
- 229910052782 aluminium Inorganic materials 0.000 claims description 6
- 229910052804 chromium Inorganic materials 0.000 claims description 6
- 230000008569 process Effects 0.000 claims description 6
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 5
- 238000013461 design Methods 0.000 claims description 5
- 244000046052 Phaseolus vulgaris Species 0.000 claims description 4
- 235000010627 Phaseolus vulgaris Nutrition 0.000 claims description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 4
- 238000000137 annealing Methods 0.000 claims description 4
- 238000005266 casting Methods 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 4
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 3
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 claims description 3
- 238000002161 passivation Methods 0.000 abstract description 9
- 239000002253 acid Substances 0.000 abstract description 7
- 238000005275 alloying Methods 0.000 abstract description 6
- 239000013078 crystal Substances 0.000 abstract description 4
- 239000000463 material Substances 0.000 abstract description 3
- 239000000243 solution Substances 0.000 description 24
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 22
- 230000000052 comparative effect Effects 0.000 description 15
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 8
- 239000007789 gas Substances 0.000 description 7
- 238000002791 soaking Methods 0.000 description 6
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 4
- 239000003345 natural gas Substances 0.000 description 4
- 230000001590 oxidative effect Effects 0.000 description 4
- 230000003068 static effect Effects 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 239000003209 petroleum derivative Substances 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- 229910004349 Ti-Al Inorganic materials 0.000 description 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- 229910004692 Ti—Al Inorganic materials 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 239000012153 distilled water Substances 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 239000003129 oil well Substances 0.000 description 2
- 229910052719 titanium Inorganic materials 0.000 description 2
- PMTRSEDNJGMXLN-UHFFFAOYSA-N titanium zirconium Chemical compound [Ti].[Zr] PMTRSEDNJGMXLN-UHFFFAOYSA-N 0.000 description 2
- 244000137852 Petrea volubilis Species 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- QWPPOHNGKGFGJK-UHFFFAOYSA-N hypochlorous acid Chemical compound ClO QWPPOHNGKGFGJK-UHFFFAOYSA-N 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 230000035882 stress Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000012085 test solution Substances 0.000 description 1
- 239000004408 titanium dioxide Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C14/00—Alloys based on titanium
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
- B21J5/002—Hybrid process, e.g. forging following casting
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- 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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
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Abstract
The invention discloses a high-strength corrosion-resistant titanium alloy which comprises the following elements in percentage by mass: 4-5% of Al, 1-2% of Cr, 5-6% of Nb, 3.5-4.5% of Zr, and the balance of Ti and inevitable impurities; the preparation method of the titanium alloy comprises the following steps: 1. preparing materials and pressing electrodes; 2. carrying out vacuum consumable melting to obtain an ingot; 3. and (4) cutting off a dead head of the cast ingot, cogging and forging for three times, and rolling and thermally treating to obtain the titanium alloy bar. Based on the corrosion resistance and strength theory of binary titanium alloy, in combination with the mechanical property requirement applied to oil gas exploitation and the crystal cluster theory, al, cr, nb and Zr are selected as alloying elements of the titanium alloy, the addition amount is accurately determined, the passivation capability, the specific strength and the thermal strength of the titanium alloy are improved, the titanium alloy with excellent corrosion resistance and tensile property to non-oxidized acid is obtained, and the titanium alloy is suitable for the oil gas exploitation field; the preparation process is simple.
Description
Technical Field
The invention belongs to the technical field of oil exploitation, and particularly relates to a high-strength corrosion-resistant titanium alloy and a preparation method thereof.
Background
Petroleum and natural gas are economic life lines of a country, china is the largest petroleum import country in the world, and the external dependence degree is as high as 73%. CO in petroleum and natural gas extracted from China 2 、H 2 S、Cl - The content is higher, and the corrosion problem is particularly outstanding. Titanium alloys are widely considered as the first choice material for the next generation of oil and gas exploitation due to their good corrosion resistance and high specific strength, and have been successfully used abroad. However, the corrosion resistance of titanium alloys is generally referred to as in oxidizing acids (HNO) 3 、HClO 4 Etc.) to form a dense oxide film of titanium dioxide, thereby preventing further reaction of corrosion. In the oil and gas exploitation of China, the oil well mainly contains a large amount of H 2 S, which forms H when dissolved in water + And HS - (ii) a In addition, hydrochloric acid is used as a low density, low pressure drilling fluid which has the effects of stabilizing the borehole wall, cooling and flushing the drill bit, removing downhole debris, and the like, and is a non-oxidizing acid. Because the corrosion resistance of the existing titanium alloy in non-oxidizing acid is generally poor, the wide application of the titanium alloy in the field of oil well exploitation is directly limited.
Disclosure of Invention
The technical problem to be solved by the present invention is to provide a high-strength corrosion-resistant titanium alloy in view of the above-mentioned deficiencies of the prior art. Based on the corrosion resistance and strength theory of binary titanium alloy in HCl solution with the mass fraction of 20% at 25 ℃, the mechanical property requirement and the crystal cluster theory applied to oil gas exploitation are combined, al, cr, nb and Zr are selected as alloying elements of the titanium alloy, the addition amount is accurately determined, the passivation capability, the specific strength and the thermal strength of the titanium alloy are improved, the titanium alloy with excellent corrosion resistance and tensile property to non-oxidized acid is obtained, and the method is suitable for the field of oil gas exploitation.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: the high-strength corrosion-resistant titanium alloy is characterized by comprising the following elements in percentage by mass: 4-5% of Al, 1-2% of Cr, 5-6% of Nb, 3.5-4.5% of Zr, and the balance of Ti and inevitable impurities; the corrosion rate of the titanium alloy in HCl solution with the mass fraction of 20% at 25 ℃ is not more than 0.388mm/a, the tensile strength Rm is not less than 950MPa, and the elongation A after fracture is not less than 10%.
The invention designs the components of the titanium alloy based on the theory of the corrosion resistance and the strength of the binary titanium alloy in HCl solution with the mass fraction of 20% at 25 ℃. Firstly, by selecting and adding easily passivated alloying elements Cr, nb and Zr as alloying elements of a titanium matrix in the titanium alloy, the anode activation of the titanium alloy is effectively reduced, and the passivation capability of the titanium alloy is improved. Secondly, screening and comparative study of corrosion experimental data of a large amount of Ti-X (X = Al, cr, nb, zr and the like) binary titanium alloys are carried out to obtain fitting results (shown in figures 1 a-1 b) of polarized resistance values (Rp) of the binary titanium alloys in HCl solution with the mass fraction of 20% at the temperature of 25 ℃, the corrosion resistance of the binary titanium alloys is evaluated by adopting the Rp, and the higher the Rp is, the higher the resistance is, the better the corrosion resistance is; as can be seen from FIGS. 1a to 1b, the Ti-4Al in the Ti-Al binary titanium alloy has the best corrosion resistance at 25 ℃ in a HCl solution with the mass fraction of 20%, the Ti-4Al in the Ti-Zr binary titanium alloy has the best corrosion resistance at 25 ℃ in a HCl solution with the mass fraction of 20%, the Ti-2Cr in the Ti-Cr binary titanium alloy has the best corrosion resistance at 25 ℃ in a HCl solution with the mass fraction of 20%, and the Ti-5Nb in the Ti-Nb binary titanium alloy has the best corrosion resistance at 25 ℃ in an HCl solution with the mass fraction of 20%, so that the addition amounts of Al, cr, nb and Zr are preliminarily determined. Thirdly, in order to meet the mechanical property requirement in oil and gas exploitation, the titanium alloy of the invention is added with the alloying element Al to improve the specific strength and the thermal strength of the titanium alloy, and plays a role in regulating the alpha/beta two-phase ratio of the titanium alloy, thereby regulating and controlling the mechanical property and the corrosion efficiency of the titanium alloy. Meanwhile, the addition amounts of Cr, nb, zr, al and other elements are finely regulated and controlled by a crystal cluster theory, so that the [ Mo ] of the titanium alloy] eq =4~6，[Al] eq And 5 to 6, the titanium alloy is ensured to have excellent corrosion resistance and tensile property.
The inventionThe empirical formula of the tensile strength Rm of the medium titanium alloy is as follows: rm =235+ 60X [ Al × [] eq +50×[Mo] eq 。
The high-strength corrosion-resistant titanium alloy is characterized by comprising the following elements in percentage by mass: 4.6% of Al, 1.5% of Cr, 5.4% of Nb, 3.9% of Zr, and the balance of Ti and inevitable impurities.
In addition, the invention also discloses a method for preparing the high-strength corrosion-resistant titanium alloy, which is characterized by comprising the following steps:
step one, selecting aluminum beans, zirconium sponge, pure chromium, ti-56.7Nb and titanium sponge according to the design components of a target product, mixing, and pressing to obtain an electrode;
step two, carrying out vacuum consumable melting on the electrode obtained in the step one for 2 times to obtain an ingot;
step three, cutting off a riser of the ingot casting obtained in the step two, sequentially performing three times of cogging forging at 1100 ℃, 1000 ℃ and 940 ℃, then rolling at 830 ℃, and performing heat treatment to obtain a titanium alloy bar; and the deformation of each cogging forging in the three cogging forging processes is more than 50 percent.
The method is characterized in that the heat treatment system comprises the following steps: heating to 650 ℃, annealing for 1h to 2h, and then cooling in air to room temperature.
Compared with the prior art, the invention has the following advantages:
1. based on the corrosion resistance and strength theory of binary titanium alloy in HCl solution with the mass fraction of 20% at 25 ℃, the mechanical property requirement and the crystal cluster theory applied to oil gas exploitation are combined, al, cr, nb and Zr are selected as alloying elements of the titanium alloy, the addition amount is accurately determined, the passivation capability, the specific strength and the thermal strength of the titanium alloy are improved, the titanium alloy with excellent corrosion resistance and tensile property to non-oxidized acid is obtained, and the method is suitable for the field of oil gas exploitation.
2. Al in the titanium alloy belongs to alpha stable elements, cr belongs to strong beta stable elements, nb belongs to weak beta stable elements, zr belongs to neutral elements, the 'cocktail effect' is exerted by mutual matching of different types of elements, al, zr and Nb elements cooperatively reinforce an alpha phase and Cr, nb and Zr cooperatively reinforce a beta phase, and meanwhile, zr and Nb elements participate in the formation of a passivation film of the titanium alloy in an HCl solution, the density of the passivation film is improved, the surface stress state of the passivation film is improved, the phase transition (compact to loose) of the passivation film is delayed, the stability of the passivation film in the HCl solution is improved, and therefore the corrosion resistance of the titanium alloy is improved.
3. The corrosion rate of the titanium alloy in HCl solution with the mass fraction of 20% at 25 ℃ is not more than 0.388mm/a, the tensile strength Rm is not less than 950MPa, the elongation percentage A after fracture is not less than 10%, the corrosion resistance and the strength of the titanium alloy are superior to those of the common TC4 titanium alloy, and the titanium alloy has wide application prospect in petroleum and natural gas exploitation and chemical industry.
4. According to the invention, the raw materials are proportioned and then pressed into the electrode to be subjected to vacuum consumable melting, the obtained cast ingot is subjected to cooling cogging forging and hot rolling in sequence, and the titanium alloy bar is obtained after heat treatment, so that the process is simple and easy to realize.
The technical solution of the present invention is further described in detail by the accompanying drawings and examples.
Drawings
FIG. 1a shows the fitting result of the polarized resistance value (Rp) of the Ti-Al binary titanium alloy in HCl solution with the mass fraction of 20% at 25 ℃.
FIG. 1b is the fitting result of the polarized resistance value (Rp) of the Ti-Zr binary titanium alloy in HCl solution with the mass fraction of 20% at 25 ℃.
FIG. 1c shows the fitting result of the polarization resistance (Rp) of Ti-Cr binary titanium alloy in HCl solution with mass fraction of 20% at 25 ℃.
FIG. 1d is the fitting result of the polarized resistance value (Rp) of the Ti-Nb binary titanium alloy in HCl solution with the mass fraction of 20% at 25 ℃.
FIG. 2 is a graph comparing the corrosion rates of the titanium alloys of example 1 of the present invention and comparative example 1.
FIG. 3 is a graph comparing the tensile properties of the titanium alloys of example 1 of the present invention and comparative example 1.
Detailed Description
Example 1
The high-strength corrosion-resistant titanium alloy of the embodiment comprises the following elements in percentage by mass: 4.6% of Al, 1.5% of Cr, 5.4% of Nb, 3.9% of Zr, and the balance of Ti and inevitable impurities.
The preparation method of the high-strength corrosion-resistant titanium alloy comprises the following steps:
step one, selecting aluminum beans, sponge zirconium, pure chromium, ti-56.7Nb and sponge titanium according to the design components (Ti-4.6 Al-1.5Cr-5.4Nb-3.9 Zr) of a target product, mixing, and then pressing to obtain an electrode;
step two, carrying out vacuum consumable melting on the electrode obtained in the step one for 2 times to obtain an ingot;
step three, cutting off a riser of the ingot casting obtained in the step two, sequentially performing three times of cogging forging at 1100 ℃, 1000 ℃ and 940 ℃, then rolling at 830 ℃, and performing heat treatment to obtain a titanium alloy bar; the deformation of each cogging forging in the three cogging forging processes is respectively 50%, 60% and 70%; the heat treatment system comprises the following steps: heating to 650 ℃ for annealing treatment for 1h, and then cooling to room temperature.
Comparative example 1
The TC4 titanium alloy of the comparative example consists of the following elements in percentage by mass: 6% of Al, 4% of V and the balance of Ti and inevitable impurity elements.
The preparation method of the TC4 titanium alloy of the present comparative example includes the steps of:
step one, selecting aluminum beans, al-85V and titanium sponge according to the design components of a target product, mixing, and pressing to obtain an electrode;
step two, carrying out vacuum consumable melting on the electrode obtained in the step one for 2 times to obtain an ingot;
thirdly, cutting off risers of the ingot casting obtained in the second step, sequentially performing three times of cogging forging at 1150 ℃, 1050 ℃ and 950 ℃, then rolling at 900 ℃, and performing heat treatment to obtain a titanium alloy bar; the deformation of each cogging forging in the three cogging forging processes is respectively 50%, 60% and 70%; the heat treatment system comprises the following steps: heating to 940 deg.C for solution treatment for 10min, cooling with water, cooling to 700 deg.C, and aging for 4h.
The corrosion performance and tensile property of the high-strength corrosion-resistant titanium alloy of the embodiment 1 and the TC4 titanium alloy of the comparative example 1 are detected and analyzed, and the specific process is as follows:
(1) Analysis of Corrosion Properties
The titanium alloys of example 1 and comparative example 1 were respectively wire-cut to prepare static immersion samples (length × width × height) of 24mm × 18mm × 2mm, and 3 samples were cut out of each titanium alloy plate to ensure the repeatability of the experiment; polishing the static soaking sample by using SiC coarse sand paper of 400#, 1200# and 2000#, then ultrasonically cleaning for 5min by using ethanol and distilled water in sequence, and drying by using cold air; soaking the dried static soaking samples in containers containing 100mL of natural gas-filled test solution respectively to satisfy the minimum solution volume to sample area ratio (0.20 mL/mm) 2 ) And the exposed area of each specimen is independently calculated from the geometric dimensions; within 10 days from soaking, taking out a static soaking sample every 2 days, sequentially cleaning by using ethanol and distilled water to remove corrosion products, drying, weighing, selecting 3 parallel samples each time to ensure the repetition rate, taking an average value, and calculating the corrosion rate by using the following formula (1), wherein the result is shown in figure 2:
R=(8.76×10 4 xAW)/(AxT xD) formula (1)
In formula (1): r represents corrosion rate, and the unit is mm/y; delta W represents the difference of the mass of the two statically soaked samples before and after corrosion, and the unit is g; a represents the total area of the sample in cm 2 (ii) a T represents soaking time, and the unit is h; d is the density of the material in g/cm 3 。
FIG. 2 is a graph comparing the corrosion rates of the titanium alloys of example 1 and comparative example 1, and it can be seen from FIG. 2 that the corrosion rate of the titanium alloy of example 1 in an HCl solution with a mass fraction of 20% at 25 ℃ is 0.388mm/a, and the corrosion rate of the titanium alloy of comparative example 1 in an HCl solution with a mass fraction of 20% at 25 ℃ is 0.446mm/a, indicating that the corrosion resistance of the titanium alloy of the present invention to a non-oxidizing acid is superior to that of the TC4 titanium alloy.
(2) Analysis of tensile Properties
Tensile samples were prepared by wire-cutting the titanium alloys of example 1 and comparative example 1, respectively, and 2 samples were cut out of each titanium alloy sheet to ensure the reproducibility of the experiment, and then yield strength, tensile strength and elongation were measured, and the results are shown in fig. 3.
Fig. 3 is a graph comparing the tensile properties of the titanium alloys of example 1 and comparative example 1, and it can be seen from fig. 3 that the yield strength of the titanium alloy of example 1 is 916MPa, the tensile strength Rm =977MPa, the elongation after fracture a =10.6%, the yield strength of the titanium alloy of comparative example 1 is 854MPa, the tensile strength Rm =915MPa, and the elongation after fracture a =9.7%, which shows that the mechanical properties of the titanium alloy of the present invention, including strength and elongation, are better than those of the TC4 titanium alloy.
Example 2
The present example differs from comparative example 1 in that: the high-strength corrosion-resistant titanium alloy consists of the following elements in percentage by mass: 5% of Al, 2% of Cr, 5% of Nb, 3.5% of Zr, and the balance of Ti and inevitable impurities.
Through detection, the corrosion rate of the titanium alloy in the HCl solution with the mass fraction of 20% at 25 ℃ is 0.31mm/a, the tensile strength Rm =1050MPa, and the elongation A after fracture is more than or equal to 11%.
Example 3
The present example differs from comparative example 1 in that: the high-strength corrosion-resistant titanium alloy consists of the following elements in percentage by mass: 4% of Al, 1% of Cr, 6% of Nb, 4.5% of Zr, and the balance of Ti and inevitable impurities; the time of the annealing treatment is 2h.
Through detection, the corrosion rate of the titanium alloy in the HCl solution with the mass fraction of 20% at 25 ℃ is 0.29mm/a, the tensile strength Rm =1000MPa, and the elongation A after fracture is more than or equal to 10%.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention in any way. Any simple modification, change and equivalent changes of the above embodiments according to the technical essence of the invention are still within the protection scope of the technical solution of the invention.
Claims (4)
1. The high-strength corrosion-resistant titanium alloy is characterized by comprising the following elements in percentage by mass: 4-5% of Al, 1-2% of Cr, 5-6% of Nb, 3.5-4.5% of Zr, and the balance of Ti and inevitable impurities; the corrosion rate of the titanium alloy in HCl solution with the mass fraction of 20% at 25 ℃ is not more than 0.388mm/a, the tensile strength Rm is not less than 950MPa, and the elongation A after fracture is not less than 10%.
2. The high-strength corrosion-resistant titanium alloy according to claim 1, which is composed of the following elements in percentage by mass: 4.6% of Al, 1.5% of Cr, 5.4% of Nb, 3.9% of Zr, and the balance of Ti and inevitable impurities.
3. A method of producing a high strength corrosion resistant titanium alloy according to claim 1 or claim 2, comprising the steps of:
step one, selecting aluminum beans, zirconium sponge, pure chromium, ti-56.7Nb and titanium sponge according to the design components of a target product, mixing, and pressing to obtain an electrode;
step two, carrying out vacuum consumable melting on the electrode obtained in the step one for 2 times to obtain an ingot;
step three, cutting off a riser of the ingot casting obtained in the step two, sequentially performing three times of cogging forging at 1100 ℃, 1000 ℃ and 940 ℃, then rolling at 830 ℃, and performing heat treatment to obtain a titanium alloy bar; and the deformation of each cogging forging in the three-time cogging forging process is more than 50 percent.
4. The method of claim 3, wherein the heat treatment regimen is: heating to 650 ℃, annealing for 1h to 2h, and then cooling to room temperature in air.
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| CN113388754A (en) * | 2021-04-29 | 2021-09-14 | 西安交通大学 | High-strength Ti-Cr-Zr-Mo-Al series titanium alloy and preparation method thereof |
| CN114107734A (en) * | 2021-11-30 | 2022-03-01 | 西安稀有金属材料研究院有限公司 | Alpha + beta titanium alloy with low elastic modulus and high strength and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113388754A (en) * | 2021-04-29 | 2021-09-14 | 西安交通大学 | High-strength Ti-Cr-Zr-Mo-Al series titanium alloy and preparation method thereof |
| CN114107734A (en) * | 2021-11-30 | 2022-03-01 | 西安稀有金属材料研究院有限公司 | Alpha + beta titanium alloy with low elastic modulus and high strength and preparation method thereof |
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