CN109321866B - Preparation method of titanium alloy gradient structure - Google Patents
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- CN109321866B CN109321866B CN201811516057.1A CN201811516057A CN109321866B CN 109321866 B CN109321866 B CN 109321866B CN 201811516057 A CN201811516057 A CN 201811516057A CN 109321866 B CN109321866 B CN 109321866B
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
- C23C8/08—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases only one element being applied
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- 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
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/02—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working in inert or controlled atmosphere or vacuum
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- 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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- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
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Abstract
The invention relates to a preparation method of a titanium alloy gradient structure. The method comprises the following steps: firstly, forging a titanium alloy blank to refine a titanium alloy structure, then carrying out hydrogen treatment, forming a concentration gradient of hydrogen from outside to inside in the blank by controlling the hydrogen charging time, then carrying out isothermal heat treatment at a certain temperature, wherein in the process, the phase change temperature of the outer surface of the blank is reduced due to hydrogen charging and is lower than the isothermal heat treatment temperature, so that the outer surface of the blank is converted into a basket structure or a Widmannstatten structure, the inner part of the blank still keeps an equiaxial fine-grained structure, and finally removing the redundant hydrogen in the blank by vacuum hydrogen removal treatment. According to the method, the titanium alloy blank is subjected to forging-modifying treatment, surface treatment, hydrogen placing treatment, isothermal heat treatment and vacuum dehydrogenation treatment in sequence, so that the titanium alloy gradient structure with large gradient and gradual change tissue morphology is obtained, the method is simple and convenient in process operation, high in preparation efficiency and high in product comprehensive performance.
Description
Technical Field
The invention relates to the technical field of titanium alloy structure manufacturing, in particular to a preparation method of a titanium alloy gradient structure.
Background
Titanium and titanium alloys have excellent comprehensive mechanical properties, and are highly valued and widely applied in the industries of aviation, aerospace, ships, petroleum, chemical engineering, weapons, electronics, biomedical and the like. As is known, titanium alloy has different tissue forms, such as equiaxial tissue, bimodal tissue, tri-modal tissue, basket tissue, widmannstatten tissue and the like, and the different tissue forms have different service properties, such as high equiaxial tissue strength, high plasticity, long low-cycle fatigue life, but poor durability, creep strength and fracture toughness; the basket-shaped structure has higher lasting and creep strength and good fracture toughness, the plasticity is higher than that of the widmannstatten structure, and the low-cycle fatigue performance is lower than that of the equiaxed structure.
The titanium alloy structure is often stressed very complicatedly in the service process, the stress of different parts is different, and in order to meet the stress requirement in engineering, the titanium alloy is manufactured into a gradient structure, namely different parts have different tissue forms. For example, the disk edge of a titanium alloy compressor of an aircraft engine is in contact with high-temperature gas and needs to have good endurance, creep deformation and fatigue crack propagation resistance, and in contrast, the disk center needs to have higher strength and low cycle fatigue performance due to relatively low working temperature and large centrifugal stress, which requires that the disk body has different tissue forms in different areas, the disk edge of the compressor is a basket tissue, and the disk center is an equiaxed tissue.
At present, the preparation method of the titanium alloy gradient structure mainly comprises three methods: the first is a gradient heat treatment process, that is, a special heat treatment device is adopted to control the temperature of different areas of the titanium alloy blank so that one part of the areas is below the phase transition temperature and the other part of the areas is above the phase transition temperature, thereby obtaining the titanium alloy gradient structure consisting of equiaxed structure → basket-shaped structure/widmannstatten structure. The second method is a pretreatment and thermomechanical treatment method, namely, the titanium alloy blank is integrally formed into an acicular martensite structure through pretreatment, different areas are deformed to different degrees, and finally, a titanium alloy gradient structure consisting of an equiaxed structure → a basket-shaped structure/a Widmannstatten structure is formed through recrystallization annealing. The third method is a thermomechanical treatment and welding composite method, namely, the titanium alloy blank is deformed or heat treated below the phase transition temperature and above the phase transition temperature respectively to have an equiaxed structure or a basket structure, and then the titanium alloy blank is compounded together by a welding method (such as electron beam welding) to form a titanium alloy gradient structure consisting of an equiaxed structure → a basket-shaped structure/a Widmans structure.
At present, the preparation method of the titanium alloy gradient structure has the defects that for the gradient heat treatment method, the difficulty of designing and manufacturing a heat treatment device is high, the operation is complex, and the heat dissipation block matched with the structure of each specification needs to be designed and manufactured, so that the manufacturing cost is higher; for the pretreatment and thermomechanical treatment method, precise control needs to be performed on the tissues in the pretreatment process, the blank needs to be subjected to strict structural design so as to control the deformation of different areas, the control requirement on the technological process is high, and the technological window is narrow. In addition, the existing preparation method has limited tissue regulation and control capability, is difficult to ensure gradual transition among various tissues with obvious differences, often has the problem of obvious 'weak connection' between different parts due to performance mutation, and particularly has the prominent problem in the 'thermomechanical treatment + welding composite method', so that the area becomes a dangerous area for damage and fracture, and the service performance of the whole structure is influenced.
Therefore, the inventor provides a preparation method of a titanium alloy gradient structure.
Disclosure of Invention
The embodiment of the invention provides a preparation method of a titanium alloy gradient structure. The process is simple, the obtained titanium alloy gradient structure has more excellent comprehensive mechanical properties, and the problems of discontinuous structure and performance of the titanium alloy gradient structure prepared by the prior art and complex operation of a preparation device are solved.
The embodiment of the invention provides a preparation method of a titanium alloy gradient structure, which comprises the following steps:
forging, namely, upsetting and drawing out the titanium alloy blank for multiple times by using a free forging method, wherein the temperature of the free forging is t1Wherein t isβ-50℃≦t1≦tβ-30℃，tβThe phase transition temperature of the titanium alloy is then cooled to room temperature in air, so that the structure of the titanium alloy blank is refined, and the uniformity of the structure is improved;
surface treatment, namely removing oxides on the outer surface of the titanium alloy blank by using a machining method after forging change treatment, and removing oil on the surface of the titanium alloy blank by using a metal cleaning agent;
placing the titanium alloy blank subjected to surface treatment into a hydrogen treatment furnace, vacuumizing, heating to 500-750 ℃, then filling a predetermined amount of hydrogen at a flow rate of 1-5L/min, preserving heat, reducing the hydrogen content in the structure of the titanium alloy blank from outside to inside to form a hydrogen-placing concentration gradient, wherein the hydrogen content is not more than 0.2wt%, finally cooling to room temperature, extracting the hydrogen in the hydrogen treatment furnace, filling argon after reaching a predetermined vacuum degree, opening a furnace door and taking out the titanium alloy blank when the pressure in the furnace is the same as the atmospheric pressure;
isothermal heat treatment, after hydrogen treatment, combining titaniumPutting the gold blank into an air resistance furnace for heat treatment, wherein the furnace temperature is t2Is kept warm in an environment of (1), wherein t0＜t2＜t3， t0The titanium alloy phase transition temperature t when the concentration gradient of hydrogen is at the maximum value3Keeping the titanium alloy phase transition temperature at the lowest hydrogen concentration gradient for 1-4h, cooling to room temperature along with the furnace, and cleaning the surface of the titanium alloy blank;
and (3) performing vacuum dehydrogenation treatment, namely putting the titanium alloy blank subjected to surface treatment into a vacuum heat treatment furnace for vacuum heat treatment, wherein the heat treatment temperature is 500-750 ℃, preserving the heat for 2-6h, stopping heating when the preset vacuum degree is met, air-cooling the titanium alloy blank to room temperature, filling high-purity argon, and opening a furnace door when the pressure in the furnace is the same as the atmospheric pressure to obtain the titanium alloy blank with the gradient structure.
Further, the titanium alloy blank adopts the raw material of alpha titanium alloy, alpha + beta titanium alloy or near beta titanium alloy bar.
Further, in the forging improving method, when the titanium alloy blank adopts the TC4 titanium alloy bar as the raw material, the phase transition temperature of the TC4 titanium alloy bar is tβAt 980 ℃ and a free forging temperature t1Is 950 ℃.
Further, in the hydrogen treatment method, the titanium alloy blank subjected to surface treatment is placed in a hydrogen treatment furnace, and vacuum pumping is performed until the vacuum degree is more than 10-2pa, heating to 700 ℃, closing the vacuum system, filling a predetermined amount of hydrogen with the purity of 99.9999% at the flow rate of 2L/min, then starting heat preservation to ensure that the hydrogen content on the surface of the titanium alloy blank is 0.19wt.%, the hydrogen content in the titanium alloy blank is 0.007wt.%, and finally cooling to room temperature.
Further, in the hydrogen treatment method, the residual hydrogen in the hydrogen treatment furnace is pumped out by a mechanical pump, and the vacuum degree is more than 10-1When pa, argon with the purity of 99.99 percent is filled, and when the pressure in the furnace is the same as the atmospheric pressure, the furnace door is opened and the titanium alloy blank is taken out.
Further, in the isothermal heat treatment method, titanium is combinedThe gold blank is put into an air resistance furnace for heat treatment, the furnace temperature is kept at 920 ℃, and at the moment, the phase transition temperature t of the titanium alloy blank with the hydrogen content of 0.19wt.% is0The temperature was 910 ℃.
Further, in the vacuum dehydrogenation treatment method, the titanium alloy blank subjected to surface treatment is placed into a vacuum heat treatment furnace for vacuum heat treatment, the heat treatment temperature is 700 ℃, the temperature is kept for 2 hours, and when the vacuum degree is more than 10-2And pa, stopping heating, cooling the titanium alloy blank to room temperature in air, filling argon with the purity of 99.99%, and opening the furnace door when the pressure in the furnace is the same as the atmospheric pressure to obtain the titanium alloy blank with the gradient structure.
In summary, the new method for preparing the titanium alloy gradient structure provided by the invention based on the hydrogen induced phase change of the titanium alloy has the following advantages compared with the existing method for preparing the titanium alloy gradient structure:
1. the regulation and control of the gradient structure can be realized through the heat treatment of a common hydrogen treatment furnace, an air furnace and the like, the process is simple, the cost is low, and the method is suitable for industrial production.
2. The titanium alloy can form a tissue form of a large-gradient titanium alloy, avoids the discontinuity of the tissue and the performance, has more excellent comprehensive mechanical property, and better meets the application requirement.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments of the present invention will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a structural morphology of the edge of a titanium alloy billet having a gradient structure.
Fig. 2 is a structural morphology diagram of the inside of a titanium alloy billet having a gradient structure.
Detailed Description
The embodiments of the present invention will be described in further detail with reference to the drawings and examples. The following detailed description of the embodiments and the accompanying drawings are provided to illustrate the principles of the invention and are not intended to limit the scope of the invention, i.e., the invention is not limited to the embodiments described, but covers equivalent modifications, substitutions and improvements without departing from the spirit of the invention.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
The novel method for preparing the titanium alloy gradient structure is provided aiming at the defects in the preparation process of the titanium alloy gradient structure at present, the difficult problem that the design and manufacture difficulty of a heat treatment device in the gradient heat treatment process is high is avoided, the difficulty in the manufacturing process of the gradient titanium alloy structure is reduced, the performance of the gradient titanium alloy structure is improved (the problem of weak connection is avoided), and a way is provided for the efficient, low-cost and high-performance manufacture of the titanium alloy gradient structure.
The preparation method at least comprises the following steps S110-S140:
step S110 is a forging process, a free forging method is used for upsetting and drawing out the titanium alloy blank for multiple times, and the temperature of the free forging is t1Wherein t isβ-50℃≦t1≦tβ-30℃，tβKeeping the temperature for a preset time after free forging for the phase transition temperature of the titanium alloy, and then cooling the titanium alloy to room temperature in an air mode to refine the structure of the titanium alloy blank and improve the uniformity of the structure.
Step S120 is surface treatment, after the forging process is carried out, oxides on the outer surface of the titanium alloy blank are removed by a machining method, and the surface of the titanium alloy blank is degreased and cleaned by a metal cleaning agent.
Step S130 is hydrogen placing treatment, the titanium alloy blank after surface treatment is placed into a hydrogen treatment furnace, after vacuum pumping, heating is carried out to 500-750 ℃, then hydrogen with a preset amount is filled at a flow rate of 1-5L/min, heat preservation is carried out, the hydrogen content in the structure of the titanium alloy blank is reduced from outside to inside, a hydrogen placing concentration gradient is formed, wherein the highest hydrogen content is not more than 0.2wt%, finally cooling is carried out to room temperature, the hydrogen in the hydrogen treatment furnace is pumped out, argon is filled after a preset vacuum degree is reached, when the pressure in the furnace is the same as the atmospheric pressure, a furnace door is opened, and the titanium alloy blank is taken out.
Step S140 is isothermal heat treatment, after the hydrogen treatment, the titanium alloy blank is put into an air resistance furnace for heat treatment, and the furnace temperature is t2Is kept warm in an environment of (1), wherein t0＜t2＜t3，t0The titanium alloy phase transition temperature t when the concentration gradient of hydrogen is at the maximum value3And (3) keeping the temperature for 1-4h for the titanium alloy phase transition temperature when the hydrogen concentration gradient is at the lowest value, then cooling to room temperature along with the furnace, repeating the step S120, and performing surface cleaning treatment on the titanium alloy blank.
And S150, performing vacuum dehydrogenation treatment, namely putting the titanium alloy blank subjected to surface treatment into a vacuum heat treatment furnace for vacuum heat treatment at the temperature of 500-750 ℃, preserving heat for 2-6h, stopping heating when the preset vacuum degree is met, air-cooling the titanium alloy blank to room temperature, filling high-purity argon, and opening a furnace door when the pressure in the furnace is the same as the atmospheric pressure to obtain the titanium alloy blank with the gradient structure.
The invention provides a novel preparation method of a titanium alloy gradient structure based on hydrogen induced phase change of a titanium alloy. Firstly, forging a titanium alloy blank to refine a titanium alloy structure, then carrying out hydrogen treatment, forming a concentration gradient of hydrogen from outside to inside in the blank by controlling the hydrogen charging time, then carrying out isothermal heat treatment at a certain temperature, wherein in the process, the phase transition temperature of the outer surface of the blank is reduced due to hydrogen charging and is lower than the isothermal heat treatment temperature, so that the outer surface of the blank is converted into a basket structure or a Weishi structure, the inner part of the blank still keeps an equiaxial fine crystal structure, and finally removing redundant hydrogen in the blank by vacuum hydrogen removal treatment, thereby meeting the requirements of national standards.
The invention adopts common free forging hammer, hydrogen treatment furnace, vacuum furnace, air furnace and other equipment to carry out microstructure regulation and control treatment, does not need special equipment with complicated gradient heat treatment, can realize the preparation of the gradient titanium alloy structure by changing the processes of forging, hydrogen placing treatment, isothermal heat treatment and vacuum dehydrogenation treatment, does not need to design the appearance of the blank, and the prepared titanium alloy structure has large gradient and gradual change tissue form without the defects of weak connection and the like, thereby being a preparation method with high efficiency, low cost and high performance of the gradient titanium alloy structure.
Preferably, the titanium alloy blank in the invention is made of alpha titanium alloy, alpha + beta titanium alloy or near beta titanium alloy bar.
Further, in the forging improving method of step S110, when the titanium alloy bar is made of the TC4 titanium alloy bar as the raw material, the phase transition temperature of the TC4 titanium alloy bar is tβAt 980 ℃ and a free forging temperature t1Is 950 ℃.
In the hydrogen treatment method of step S130, the titanium alloy ingot after surface treatment is placed in a hydrogen treatment furnace, and vacuum is applied until the degree of vacuum is greater than 10-2pa, heating to 700 ℃, closing the vacuum system, filling a predetermined amount of hydrogen with the purity of 99.9999% at the flow rate of 2L/min, then starting heat preservation to ensure that the hydrogen content on the surface of the titanium alloy blank is 0.19wt.%, the hydrogen content in the titanium alloy blank is 0.007wt.%, and finally cooling to room temperature. The residual hydrogen in the hydrogen treatment furnace is pumped out by a mechanical pump, and the vacuum degree is more than 10-1When pa, argon with the purity of 99.99 percent is filled, and when the pressure in the furnace is the same as the atmospheric pressure, the furnace door is opened and the titanium alloy blank is taken out.
In the isothermal heat treatment method of step S140, the titanium alloy ingot is placed in an air resistance furnace for heat treatment, and the furnace temperature is kept at 920 ℃, at which time the phase transition temperature t of the titanium alloy ingot with a hydrogen content of 0.19wt.% is reached0The temperature was 910 ℃.
In the air dehydrogenation treatment method of step S150, the titanium alloy blank after surface treatment is put into a vacuum heat treatment furnace for vacuum heat treatment, the heat treatment temperature is 700 ℃, the temperature is kept for 2 hours, and when the vacuum degree is more than 10-2When pa, stopping heating, cooling the titanium alloy blank to room temperature in air, filling argon with the purity of 99.99 percent, and when the pressure in the furnace is the same as the atmospheric pressure, opening the furnace door to obtain the titanium alloy blank with the gradient junctionThe structural titanium alloy blank is shown in the structural shape diagrams of different positions of the titanium alloy blank in figures 1 and 2.
The foregoing is illustrative of the present application and is not limited to the specific steps and structures described above and shown in the accompanying drawings. Also, a detailed description of known process techniques is omitted herein for the sake of brevity. Various modifications and alterations to this application will become apparent to those skilled in the art without departing from the scope of this invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.
Claims (6)
1. A preparation method of a titanium alloy gradient structure is characterized by comprising the following steps:
forging, namely, upsetting and drawing out the titanium alloy blank for multiple times by using a free forging method, wherein the temperature of the free forging is t1Wherein t isβ-50℃≦t1≦tβ-30℃，tβThe phase transition temperature of the titanium alloy is then cooled to room temperature in air, so that the structure of the titanium alloy blank is refined, and the uniformity of the structure is improved;
surface treatment, namely removing oxides on the outer surface of the titanium alloy blank by using a machining method after forging change treatment, and removing oil on the surface of the titanium alloy blank by using a metal cleaning agent;
placing the titanium alloy blank subjected to surface treatment into a hydrogen treatment furnace, vacuumizing, heating to 500-750 ℃, then filling a predetermined amount of hydrogen at a flow rate of 1-5L/min, preserving heat, reducing the hydrogen content in the structure of the titanium alloy blank from outside to inside to form a hydrogen-placing concentration gradient, wherein the hydrogen content is not more than 0.2wt%, finally cooling to room temperature, extracting the hydrogen in the hydrogen treatment furnace, filling argon after reaching a predetermined vacuum degree, opening a furnace door and taking out the titanium alloy blank when the pressure in the furnace is the same as the atmospheric pressure;
isothermal heat treatment, after hydrogen treatment, placing the titanium alloy blank into an air resistance furnace for heat treatment, wherein the furnace temperature is t2The temperature is kept in the environment of (1),wherein, t0＜t2＜t3，t0The titanium alloy phase transition temperature t when the concentration gradient of hydrogen is at the maximum value3Keeping the titanium alloy phase transition temperature at the lowest hydrogen concentration gradient for 1-4h, cooling to room temperature along with the furnace, and cleaning the surface of the titanium alloy blank;
vacuum dehydrogenation treatment, namely putting the titanium alloy blank subjected to surface treatment into a vacuum heat treatment furnace for vacuum heat treatment, wherein the heat treatment temperature is 500-750 ℃, keeping the temperature for 2-6h, stopping heating when the preset vacuum degree is met, air-cooling the titanium alloy blank to room temperature, filling high-purity argon, and opening a furnace door when the pressure in the furnace is the same as the atmospheric pressure to obtain the titanium alloy blank with the gradient structure;
the titanium alloy blank adopts the raw materials of alpha titanium alloy, alpha + beta titanium alloy or near beta titanium alloy bars.
2. The method of claim 1, wherein in the forging process, when the TC4 titanium alloy bar is used as a raw material for the titanium alloy billet, the phase transition temperature of the TC4 titanium alloy bar is tβAt 980 ℃ and a free forging temperature t1Is 950 ℃.
3. The method for preparing a titanium alloy gradient structure according to claim 2, wherein in the hydrogen treatment method, the titanium alloy blank subjected to surface treatment is placed in a hydrogen treatment furnace, and vacuum is applied until the vacuum degree is more than 10-2pa, heating to 700 ℃, closing the vacuum system, filling a predetermined amount of hydrogen with the purity of 99.9999% at the flow rate of 2L/min, then starting heat preservation to ensure that the hydrogen content on the surface of the titanium alloy blank is 0.19wt.%, the hydrogen content in the titanium alloy blank is 0.007wt.%, and finally cooling to room temperature.
4. The method for producing a titanium alloy gradient structure according to claim 3, wherein in the hydrogen treatment method, hydrogen remaining in the hydrogen treatment furnace is pumped out by a mechanical pump and is thereby treated as a true hydrogenThe hollowness is more than 10-1When pa, argon with the purity of 99.99 percent is filled, and when the pressure in the furnace is the same as the atmospheric pressure, the furnace door is opened and the titanium alloy blank is taken out.
5. The method for producing a titanium alloy gradient structure according to claim 4, wherein in the isothermal heat treatment method, the titanium alloy ingot is subjected to heat treatment in an air resistance furnace, and the temperature is maintained at 920 ℃ in the atmosphere in which the phase transition temperature t of the titanium alloy ingot having a hydrogen content of 0.19wt.%0The temperature was 910 ℃.
6. The method for preparing a titanium alloy gradient structure according to claim 2, wherein in the vacuum dehydrogenation treatment method, the titanium alloy blank after surface treatment is placed in a vacuum heat treatment furnace for vacuum heat treatment, the heat treatment temperature is 700 ℃, the temperature is kept for 2h, and when the vacuum degree is more than 10-2And pa, stopping heating, cooling the titanium alloy blank to room temperature in air, filling argon with the purity of 99.99%, and opening the furnace door when the pressure in the furnace is the same as the atmospheric pressure to obtain the titanium alloy blank with the gradient structure.
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| CN110578072B (en) * | 2019-10-23 | 2020-10-27 | 成都先进金属材料产业技术研究院有限公司 | Two-phase titanium alloy with gradient structure and preparation method thereof |
| CN113088977B (en) * | 2021-03-16 | 2022-05-20 | 华中科技大学 | Titanium alloy sheet with microstructure in lattice distribution and preparation method thereof |
| CN113832422B (en) * | 2021-09-26 | 2022-06-17 | 华中科技大学 | Titanium alloy part with different microstructure distributions and preparation method thereof |
| CN114570947B (en) * | 2022-04-12 | 2022-10-28 | 南京工业大学 | Near-net forming method and application of titanium alloy component with gradient structure |
| CN116752059A (en) * | 2023-08-17 | 2023-09-15 | 太原科技大学 | Titanium alloy surface self-nanocrystallization method and product |
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| CN109321866A (en) | 2019-02-12 |
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