CN113416907A - Grading heat treatment method for Ti555211 titanium alloy - Google Patents
Grading heat treatment method for Ti555211 titanium alloy Download PDFInfo
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- CN113416907A CN113416907A CN202110749307.1A CN202110749307A CN113416907A CN 113416907 A CN113416907 A CN 113416907A CN 202110749307 A CN202110749307 A CN 202110749307A CN 113416907 A CN113416907 A CN 113416907A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/16—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of other metals or alloys based thereon
- C22F1/18—High-melting or refractory metals or alloys based thereon
- C22F1/183—High-melting or refractory metals or alloys based thereon of titanium or alloys based thereon
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/78—Combined heat-treatments not provided for above
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/002—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working by rapid cooling or quenching; cooling agents used therefor
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Abstract
The invention discloses a graded heat treatment method of a Ti555211 titanium alloy, which comprises the following steps: precise solution treatment: carrying out precise solution treatment on the Ti555211 titanium alloy, wherein the solution temperature is 875-900 ℃ near the beta phase transition temperature of the Ti555211 titanium alloy, and the solution treatment time is 20-90 min; short-time medium-temperature annealing: the medium-temperature annealing temperature is 700-850 ℃, and the annealing time is 20-60 min; gradient aging treatment: first-stage aging treatment: the first-stage aging temperature is 500-600 ℃, and the first-stage aging time is 30-3600 min; and (3) secondary aging treatment: the secondary aging temperature is 300-400 ℃, and the secondary aging time is 30-6000 min. The invention not only improves the uniformity and stability of the internal structure of the Ti555211 titanium alloy and eliminates the thermal stress generated in the heat treatment process, but also can refine secondary precipitated phases on the microstructure and introduce dislocation structures, thereby improving the strength and fracture toughness of the titanium alloy and maintaining better plasticity.
Description
Technical Field
The invention belongs to the technical field of heat treatment of titanium alloy, and particularly relates to a graded heat treatment method of Ti555211 titanium alloy.
Background
The Ti555211 titanium alloy is a novel beta titanium alloy with a complex microstructure. The beta titanium alloy has the advantages of high specific strength, low elastic modulus, corrosion resistance, good welding performance, excellent cold formability and the like, has higher use value in multiple fields, and cannot be replaced by alpha alloy and alpha + beta alloy.
The beta titanium alloy is often used as a structural member to be applied to the fields of aviation, aerospace and the like due to the excellent mechanical property of the beta titanium alloy. However, with the development of aerospace industry, higher demands are made on fracture toughness and strong plasticity thereof. In particular, higher requirements are made in terms of fracture toughness and strong plasticity.
The traditional titanium alloy heat treatment process can ensure that the material obtains expected structure and performance to a certain extent by changing the structure form, the type, the size, the volume fraction and the like of the material. For example, patent application No. 201410136849.1 proposes a heat treatment method for a TC18 titanium alloy. The method comprises the steps of firstly, keeping the temperature of TC18 titanium alloy at T beta-60-T beta-100 ℃ (T beta is the phase transition temperature of the alloy) for 2-8 h, and then cooling the alloy to room temperature by air cooling or water cooling; and then aging the alloy at 540-600 ℃ for 4-12 h, and cooling the alloy in air to room temperature, wherein the method solves the problem of low alloy strength of the double annealing process, but the solid solution-aging process is difficult to keep good plasticity and fracture toughness of the alloy under high strength.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a graded heat treatment method for the Ti555211 titanium alloy, so that the structural uniformity and stability of the Ti555211 titanium alloy are effectively improved, the fracture toughness and strength of the alloy are improved, and better plasticity is kept.
The invention is realized by the following technical scheme:
the graded heat treatment method of the Ti555211 titanium alloy comprises the following steps:
the method comprises the following steps: precise solution treatment: carrying out precise solution treatment on the Ti555211 titanium alloy, wherein the solution temperature is 875-900 ℃ near the beta phase transition temperature of the Ti555211 titanium alloy, and the solution treatment time is 20-90 min;
step two: short-time medium-temperature annealing: the medium-temperature annealing temperature is 700-850 ℃, and the annealing time is 20-60 min;
step three: gradient aging treatment: first-stage aging treatment: the first-stage aging temperature is 500-600 ℃, and the first-stage aging time is 30-3600 min; and (3) secondary aging treatment: the secondary aging temperature is 300-400 ℃, and the secondary aging time is 30-6000 min.
As a further explanation of the present invention, the cooling method in the precise solution treatment step is water cooling.
As a further explanation of the present invention, the cooling method in the short-time medium-temperature annealing step is air cooling.
As a further explanation of the present invention, the cooling method in the first stage aging treatment step is air cooling.
As a further explanation of the present invention, the cooling method in the second stage aging treatment step is air cooling.
Compared with the prior art, the invention has the following beneficial technical effects:
the invention adopts the newly designed precise graded heat treatment, which is a heat treatment process for optimizing the material after the traditional heat treatment and deformation, the material can generate plastic deformation due to the volume shrinkage effect, dislocation strengthening and precipitation strengthening are formed, and residual compressive stress is introduced into the surface layer of the material, so that the integral strength and the surface hardness of the material are improved, better surface wear resistance is obtained, the precipitated primary phase and secondary phase are refined, and the size of the primary phase and secondary phase is controlled, thereby improving the plasticity of the material to a certain degree.
According to the invention, through carrying out precise solution treatment above the beta-phase transformation temperature of the Ti555211 titanium alloy, a certain solid solubility is increased by increasing the temperature and heating, and meanwhile, through precise control of the temperature, the thickness of a beta-phase transformation structure sheet layer is also reduced, so that a foundation is laid for subsequent grain refinement. And then carrying out short-time medium-temperature annealing, eliminating the stress difference between the surface layer and the middle part, and controlling the form of the primary alpha phase. And finally, carrying out gradient aging, wherein aging treatment at a higher temperature leads a secondary alpha phase to be formed on a beta phase matrix, and then carrying out second gradient aging treatment at a lower temperature, so that a precipitated fine dispersed phase can improve the strength and the fracture plasticity of the alloy, and simultaneously keep better plasticity.
In conclusion, by accurately controlling the heat treatment process parameters, the invention not only can reduce the heat stress generated in the heat treatment process, but also can effectively improve the uniformity and stability of the Ti555211 titanium alloy structure, can refine the grain size on the microstructure and improve the dislocation density; on the aspect of macroscopic mechanical property, the strength and plasticity of the material can be effectively improved, and the good matching of the strength and the plasticity of the material is kept.
Drawings
FIG. 1 is a structural morphology diagram of a Ti555211 titanium alloy treated in example 1 of the present invention.
FIG. 2 is a view of a graded heat treatment process of the Ti555211 titanium alloy provided by the invention.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, a detailed description of the present invention will be given below with reference to the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present invention and features of the embodiments may be combined with each other without conflict.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
Example 1
The graded heat treatment method of the Ti555211 titanium alloy comprises the following steps:
the method comprises the following steps: precise solution treatment: carrying out precise solution treatment on the forged Ti555211, wherein the solution temperature is 880 ℃ (5 ℃ above the beta phase transition temperature of the titanium alloy), the solution treatment time is 30min, and the cooling mode is water cooling;
step two: short-time medium-temperature annealing: the medium temperature annealing temperature is 800 ℃, the annealing time is 20min, and the cooling mode is air cooling;
step three: gradient aging treatment: first-stage aging treatment: the first stage aging temperature is 600 ℃, the first stage aging time is 180min, and the cooling mode is air cooling; and (3) secondary aging treatment: the second stage aging temperature is 400 ℃, the second stage aging time is 3600min, and the cooling mode is air cooling.
FIG. 1 is a microstructure of Ti555211 titanium alloy treated in example 1, and it can be seen that the Ti555211 titanium alloy after treatment has fine grains and uniform distribution.
Example 2
The graded heat treatment method of the Ti555211 titanium alloy comprises the following steps:
the method comprises the following steps: precise solution treatment: carrying out precise solution treatment on the forged Ti555211, wherein the solution temperature is 885 ℃ (10 ℃ above the beta-phase transition temperature of the titanium alloy), the solution treatment time is 30min, and the cooling mode is water cooling;
step two: short-time medium-temperature annealing: the medium temperature annealing temperature is 820 ℃, the annealing time is 60min, and the cooling mode is air cooling;
step three: gradient aging treatment: first-stage aging treatment: the first-stage aging temperature is 550 ℃, the first-stage aging time is 3600min, and the cooling mode is air cooling; and (3) secondary aging treatment: the secondary aging temperature is 380 ℃, the secondary aging time is 6000min, and the cooling mode is air cooling.
Example 3
The graded heat treatment method of the Ti555211 titanium alloy comprises the following steps:
the method comprises the following steps: precise solution treatment: carrying out precise solution treatment on the forged Ti555211, wherein the solution temperature is 875 ℃ (the beta phase transition temperature of the titanium alloy), the solution treatment time is 20min, and the cooling mode is water cooling;
step two: short-time medium-temperature annealing: the medium temperature annealing temperature is 700 ℃, the annealing time is 50min, and the cooling mode is air cooling;
step three: gradient aging treatment: first-stage aging treatment: the first stage aging temperature is 600 ℃, the first stage aging time is 30min, and the cooling mode is air cooling; and (3) secondary aging treatment: the second stage aging temperature is 300 ℃, the second stage aging time is 6000min, and the cooling mode is air cooling.
Example 4
The graded heat treatment method of the Ti555211 titanium alloy comprises the following steps:
the method comprises the following steps: precise solution treatment: carrying out precise solution treatment on the forged Ti555211, wherein the solution temperature is 900 ℃ (25 ℃ above the beta-phase transition temperature of the titanium alloy), the solution treatment time is 90min, and the cooling mode is water cooling;
step two: short-time medium-temperature annealing: the medium temperature annealing temperature is 850 ℃, the annealing time is 40min, and the cooling mode is air cooling;
step three: gradient aging treatment: first-stage aging treatment: the first stage aging temperature is 500 ℃, the first stage aging time is 1800min, and the cooling mode is air cooling; and (3) secondary aging treatment: the secondary aging temperature is 350 ℃, the secondary aging time is 30min, and the cooling mode is air cooling.
The mechanical properties of the Ti555211 titanium alloy before and after the treatment of the invention are compared, as shown in Table 1:
TABLE 1 comparison of the Properties of Ti555211 titanium alloys before and after treatment according to the invention
| Treatment method | Tensile strength/MPa | Yield strength/MPa | Elongation/percent | Fracture toughness |
| Example 1 | 1310 | 1205 | 8.0 | 71 |
| Example 2 | 1350 | 1210 | 7.5 | 77 |
| Untreated | 1210 | 1090 | 9.0 | 55 |
From the above table results, it is shown that the grain structure is optimized after the graded heat treatment process of the present invention; effectively improves the strength, plasticity and fracture toughness of the material and keeps the mechanical stability of the material.
Finally, it should be noted that the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Claims (5)
1. A graded heat treatment method of a Ti555211 titanium alloy is characterized by comprising the following steps:
the method comprises the following steps: precise solution treatment: carrying out precise solution treatment on the Ti555211 titanium alloy, wherein the solution temperature is 875-900 ℃ near the beta phase transition temperature of the Ti555211 titanium alloy, and the solution treatment time is 20-90 min;
step two: short-time medium-temperature annealing: the medium-temperature annealing temperature is 700-850 ℃, and the annealing time is 20-60 min;
step three: gradient aging treatment: first-stage aging treatment: the first-stage aging temperature is 500-600 ℃, and the first-stage aging time is 30-3600 min; and (3) secondary aging treatment: the secondary aging temperature is 300-400 ℃, and the secondary aging time is 30-6000 min.
2. The graded heat treatment method of the Ti555211 titanium alloy as claimed in claim 1, wherein the cooling means in said precise solution treatment step is water cooling.
3. The graded heat treatment method of Ti555211 titanium alloy as claimed in claim 1, wherein the cooling means in said short-time medium-temperature annealing step is air cooling.
4. The graded heat treatment method of Ti555211 titanium alloy as claimed in claim 1, wherein the cooling means in said first stage aging treatment step is air cooling.
5. The graded heat treatment method of Ti555211 titanium alloy as claimed in claim 1, wherein the cooling means in said second stage aging treatment step is air cooling.
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Cited By (2)
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| CN115287559A (en) * | 2022-07-14 | 2022-11-04 | 武汉大学 | Preparation method of titanium alloy material gradient micro-nano structure by using high-pressure water jet |
| CN116145065A (en) * | 2023-02-27 | 2023-05-23 | 沈阳工业大学 | Multistage heat treatment method for improving vickers hardness of TC4 titanium alloy additive components |
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| CN116145065A (en) * | 2023-02-27 | 2023-05-23 | 沈阳工业大学 | Multistage heat treatment method for improving vickers hardness of TC4 titanium alloy additive components |
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