CN115386819A - Aging temperature-punching control method for ultrahigh-strength titanium alloy - Google Patents
Aging temperature-punching control method for ultrahigh-strength titanium alloy Download PDFInfo
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- CN115386819A CN115386819A CN202210947382.3A CN202210947382A CN115386819A CN 115386819 A CN115386819 A CN 115386819A CN 202210947382 A CN202210947382 A CN 202210947382A CN 115386819 A CN115386819 A CN 115386819A
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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
- C21D11/00—Process control or regulation for heat treatments
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Abstract
The invention discloses an aging temperature control method of an ultrahigh strength titanium alloy, which is characterized in that after the ultrahigh strength titanium alloy is subjected to solid solution in a beta single-phase region, a two-stage heat preservation step is designed in an aging stage, and alpha phase can be slowly decomposed and separated out by controlling the primary heat preservation temperature and time and the heating rate from the primary temperature to the secondary temperature, so that the phase transformation heat of a die forging piece is slowly released in the stage, and the temperature overshoot of the forging piece is controlled. According to the invention, the temperature rise of the aging step can prevent the actual temperature of the die forging from being higher than the set temperature during aging heat treatment of the die forging due to phase change latent heat, so that the alpha sheet layer of the die forging is prevented from growing up, and the strength of the die forging is ensured.
Description
Technical Field
The invention belongs to the field of aging treatment of ultra-strong titanium alloy, and particularly relates to an aging temperature-punching control method of ultra-strong titanium alloy.
Background
The ultrahigh-strength titanium alloy is a novel titanium alloy with the strength of more than 1300MPa and higher plasticity and toughness, has important application in aerospace due to excellent mechanical property and corrosion resistance, and is a main material of structural parts of various large airplanes.
Compared with the traditional high-strength titanium alloy, the ultrahigh-strength titanium alloy has the characteristics of high content of beta stable elements, large thermophysical property change and the like, and has an obvious temperature-punching phenomenon in the aging heat treatment process, namely the temperature inside a forging piece is 0-30 ℃ higher than the set temperature of a furnace within a period of time, and the specific figure is shown in figure 1. The temperature rush phenomenon makes the actual heat treatment temperature of the forge piece difficult to control, further influences the internal structure precipitation of the forge piece, seriously deteriorates the strength performance of the forge piece and makes the mechanical property of the forge piece not meet the standard requirement. And the ultrahigh strength titanium alloy can only be subjected to solution aging heat treatment for one time, the plasticity of the forged piece can be greatly reduced during the solution aging for the second time, and the requirement of indexes is not met, so that the forged piece is scrapped.
Disclosure of Invention
The invention aims to provide an aging temperature control method of an ultrahigh-strength titanium alloy, which ensures that the temperature of the center of a forging is equal to a set temperature in a heat treatment furnace so as to ensure the stability of the mechanical property of the forging.
In order to achieve the purpose, the invention adopts the following technical scheme:
an aging temperature-punching control method of an ultrahigh strength titanium alloy comprises the following steps:
(1) Opening a hole in the center of the longitudinal and transverse surfaces of the ultrahigh-strength titanium alloy die forging after the beta single-phase region is subjected to solid solution, and installing an armored thermocouple in the hole;
(2) Firstly, raising the temperature of a heat treatment furnace to a primary aging temperature, then placing the heat treatment furnace into a die forging, measuring the temperature through an armored thermocouple, and preserving the heat for 0.5-4 h when the temperature of the die forging reaches the primary aging temperature; the primary aging temperature is 450-500 ℃;
(3) Raising the temperature to the secondary aging temperature at the temperature raising rate of 0.1-2 ℃/min, and then preserving the heat for 2-6 h according to the thickness of the die forging; the secondary aging temperature is 520-540 ℃;
(4) And after heat preservation, cooling to room temperature by air cooling.
Further, the temperature rise rate of the temperature rising to the first-stage aging temperature in the step (2) is 5-20 ℃/min.
Further, the armored thermocouple in the step (1) is sealed in a hole, the diameter of the hole is 10mm, and the depth of the hole is 1/2 of the effective thickness of the die forging.
The invention has the following beneficial effects:
(1) The temperature rise of the aging step can prevent the actual temperature of the die forging from being higher than the set temperature during the aging heat treatment of the die forging due to phase change latent heat, so that the alpha sheet layer of the die forging is prevented from growing up, and the strength of the die forging is ensured;
(2) Because the ultrahigh-strength titanium alloy forging is in a solid solution state before aging, the alpha phase can be precipitated in advance by primary low-temperature aging, and the rapid precipitation of the forging at the target aging temperature and release of a large amount of phase change latent heat are avoided, so that the temperature of the forging overshoots and deviates from the set temperature;
(3) The temperature of the first-stage aging is slowly increased to the second-stage aging, so that the alpha phase is ensured to be slowly separated out in the temperature increasing process of the forge piece, the phase change latent heat is uniformly released, the poor temperature uniformity caused by the heat accumulation of the forge piece is avoided, and the separation of the microstructure of each part is inconsistent.
Drawings
FIG. 1 is a graph of uncontrolled temperature of a die forging versus time in the prior art.
FIG. 2 is a schematic diagram of temperature rise and time of the steps of the die forging of the present invention.
FIG. 3 is a schematic diagram of the heat treatment process for controlling aging temperature.
Detailed Description
Example 1
In the aging temperature control method for the ultrahigh-strength titanium alloy provided by the embodiment, the ultrahigh-strength titanium alloy of Ti1300 is adopted in the embodiment, the size is 1000mm (length) × 400mm (width) × 210mm (thickness), the weight of a die forging piece is about 300kg, and the shape is a long beam type, and the method specifically comprises the following steps:
(1) The center of the longitudinal and transverse surfaces of the ultrahigh-strength titanium alloy die forging after the solid solution of the beta single-phase region is completed is provided with a hole, the size of the hole is phi 10 multiplied by 1/2 thickness, namely phi 10 multiplied by 105mm, and the armored thermocouple is installed in the hole, so that the armored thermocouple is sealed in the hole more accurately for measuring the temperature, and the armored thermocouple is used for measuring the temperature which is the real-time temperature of the die forging.
(2) The temperature of a heat treatment furnace is increased to a first-stage aging temperature at the heating rate of 10 ℃/min, the first-stage aging temperature is 480 ℃ in the embodiment, then the die forging piece is placed into the furnace, the temperature is measured through an armored thermocouple, and when the temperature of the die forging piece reaches the first-stage aging temperature, the temperature is kept for 2 hours, so that the latent heat of phase change in the die forging piece is fully released.
(3) Then, the primary aging temperature is increased to a secondary aging temperature at the heating rate of 2 ℃/min, the secondary aging temperature is the aging temperature of conventional aging treatment, the aging temperature of the embodiment takes 530 ℃, the time is kept for a certain time according to the thickness of the die forging, the time is longer when the thickness of the die forging is thicker, and the temperature is kept for 4h at the secondary aging temperature of the embodiment; in this embodiment, before the die forging is fed into the furnace during heat treatment, a step is set below the aging temperature for heating for a certain time (without affecting the performance of the die forging), and the heat of the center of the die forging is completely released during the time, and then the die forging is heated to the aging temperature for heat preservation, and the heat treatment process for controlling the aging temperature is shown in fig. 3.
(4) And after heat preservation, cooling to room temperature by air cooling.
The mechanical property test is carried out on the die forging subjected to the aging treatment in the embodiment and the die forging subjected to the traditional aging treatment (directly adopting the aging temperature), the relationship between the temperature and the time is respectively shown in fig. 1 and fig. 2, the relationship can be obviously shown in the figures, the situation that the strength of the die forging is not up to the standard and is not up to the requirement due to the fact that the original process obviously has a punching temperature field can be obviously seen, and the comparison result of the mechanical property test is shown in table 1.
TABLE 1 comparison of average mechanical properties of forgings by the original process for aging heat treatment and the heat treatment process of the embodiment
Example 2
In the aging temperature control method for the ultrahigh-strength titanium alloy provided by the embodiment, the ultrahigh-strength titanium alloy of Ti1300 is adopted in the embodiment, the size is 2000mm (length) × 400mm (width) × 120mm (thickness), the weight of the die forging piece is about 500kg, the die forging piece is in a long strip shape, and the method specifically comprises the following steps:
(1) The center of the longitudinal and transverse surfaces of the ultrahigh-strength titanium alloy die forging after the solid solution of the beta single-phase region is completed is provided with a hole, the size of the hole is phi 10 multiplied by 60mm, and the armored thermocouple is installed in the hole, so that the temperature measurement is more accurate, the armored thermocouple is sealed in the hole, and the armored thermocouple is used for measuring the temperature of the die forging in real time.
(2) The temperature of a heat treatment furnace is increased to a first-stage aging temperature at the rate of 5 ℃/min, wherein the first-stage aging temperature is 450 ℃ in the embodiment, then the die forging piece is placed, the temperature is measured by an armored thermocouple, and when the temperature of the die forging piece reaches the first-stage aging temperature, the die forging piece is kept warm for 3 hours, so that the phase change latent heat in the die forging piece is fully released.
(3) And then, the primary aging temperature is increased to a secondary aging temperature at the heating rate of 1 ℃/min, the secondary aging temperature is the aging temperature of conventional aging treatment, the aging temperature of the embodiment takes a value of 520 ℃, the time is kept longer when the thickness of the die forging piece is thicker according to the temperature of the die forging piece for a certain time, and the secondary aging temperature of the embodiment keeps the temperature for 3 hours.
(4) And after heat preservation, cooling to room temperature by air cooling.
The die forging piece subjected to aging treatment in the embodiment and the die forging piece subjected to traditional aging treatment (directly adopting the aging temperature) are subjected to mechanical property test, and the comparison result is shown in table 2.
TABLE 2 comparison of average mechanical properties of the forged pieces of the original process for aging heat treatment and the heat treatment process of the present embodiment
Example 3
The aging temperature-punching control method for the ultrahigh-strength titanium alloy provided by the embodiment adopts the Ti1300 ultrahigh-strength titanium alloy, the size of the ultrahigh-strength titanium alloy is (900 (upper side) +1500 (lower side)) multiplied by 1000mm (high) multiplied by 120mm (thick), the weight of a die forging piece is about 1000kg, and the ultrahigh-strength titanium alloy is trapezoidal in shape, and the method specifically comprises the following steps:
(1) The center of the longitudinal and transverse surfaces of the ultrahigh-strength titanium alloy die forging after the solid solution of the beta single-phase region is completed is provided with a hole, the size of the hole is phi 10 multiplied by 60mm, and the armored thermocouple is installed in the hole, so that the temperature measurement is more accurate, the armored thermocouple is sealed in the hole, and the armored thermocouple is used for measuring the temperature of the die forging in real time.
(2) The temperature of a heat treatment furnace is increased to a primary aging temperature at the rate of 18 ℃/min, the primary aging temperature is 500 ℃ in the embodiment, then the die forging piece is placed, the temperature is measured through an armored thermocouple, and when the temperature of the die forging piece reaches the primary aging temperature, the temperature is kept for 1h, so that the phase change latent heat in the die forging piece is fully released.
(3) Then, the primary aging temperature is increased to a secondary aging temperature at the heating rate of 1 ℃/min, the secondary aging temperature is the aging temperature of conventional aging treatment, the aging temperature of the embodiment takes 540 ℃, the time is kept for a certain time according to the thickness of the die forging, the time is longer when the thickness of the die forging is thicker, and the temperature is kept for 3h at the secondary aging temperature of the embodiment;
(4) And after heat preservation, cooling to room temperature by air cooling.
The die forging piece subjected to aging treatment in the embodiment and the die forging piece subjected to traditional aging treatment (directly adopting the aging temperature) are subjected to mechanical property test, and the comparison result is shown in table 3.
TABLE 3 comparison of average mechanical properties of the forged pieces of the original process for aging heat treatment and the heat treatment process of the embodiment
The above description is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any modification and replacement based on the technical solution and inventive concept provided by the present invention should be covered within the scope of the present invention.
Claims (3)
1. The aging temperature-punching control method of the ultrahigh-strength titanium alloy is characterized by comprising the following steps of:
(1) Opening a hole in the center of the longitudinal and transverse surfaces of the ultrahigh-strength titanium alloy die forging after the solid solution of the beta single-phase region is completed, and installing an armored thermocouple in the hole;
(4) Firstly, raising the temperature of a heat treatment furnace to a primary aging temperature, then placing the heat treatment furnace into a die forging, measuring the temperature through an armored thermocouple, and preserving the heat for 0.5-4 h when the temperature of the die forging reaches the primary aging temperature; the primary aging temperature is 450-500 ℃;
(5) Raising the temperature to the secondary aging temperature at the temperature raising rate of 0.1-2 ℃/min, and then preserving the heat for 2-6 h according to the thickness of the die forging; the secondary aging temperature is 520-540 ℃;
(6) And after heat preservation, cooling to room temperature by adopting air cooling.
2. The aging temperature-flushing control method for ultrahigh-strength titanium alloy according to claim 1, wherein the temperature-raising rate of raising to the first-stage aging temperature in step (2) is 5-20 ℃/min.
3. The aging temperature-punching control method of the ultrahigh-strength titanium alloy according to claim 1, wherein in the step (1), the armored thermocouple is sealed in a hole, the diameter of the hole is 10mm, and the depth of the hole is 1/2 of the effective thickness of the die forging.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
Citations (5)
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|---|---|---|---|---|
| JPS6479355A (en) * | 1987-09-21 | 1989-03-24 | Mitsubishi Heavy Ind Ltd | Two-stage ageing treatment for titanium alloy |
| JP2005060821A (en) * | 2003-07-25 | 2005-03-10 | Daido Steel Co Ltd | beta TYPE TITANIUM ALLOY, AND COMPONENT MADE OF beta TYPE TITANIUM ALLOY |
| CN103602936A (en) * | 2013-11-25 | 2014-02-26 | 中国航空工业集团公司北京航空材料研究院 | Titanium alloy beta converter ageing heat treatment process |
| CN110923598A (en) * | 2019-12-05 | 2020-03-27 | 中国航发北京航空材料研究院 | Heat treatment process for improving toughness of nearly β type or metastable β type titanium alloy |
| CN111647835A (en) * | 2020-06-01 | 2020-09-11 | 南京理工大学 | Method for improving mechanical heat treatment of beta-type titanium alloy |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6479355A (en) * | 1987-09-21 | 1989-03-24 | Mitsubishi Heavy Ind Ltd | Two-stage ageing treatment for titanium alloy |
| JP2005060821A (en) * | 2003-07-25 | 2005-03-10 | Daido Steel Co Ltd | beta TYPE TITANIUM ALLOY, AND COMPONENT MADE OF beta TYPE TITANIUM ALLOY |
| CN103602936A (en) * | 2013-11-25 | 2014-02-26 | 中国航空工业集团公司北京航空材料研究院 | Titanium alloy beta converter ageing heat treatment process |
| CN110923598A (en) * | 2019-12-05 | 2020-03-27 | 中国航发北京航空材料研究院 | Heat treatment process for improving toughness of nearly β type or metastable β type titanium alloy |
| CN111647835A (en) * | 2020-06-01 | 2020-09-11 | 南京理工大学 | Method for improving mechanical heat treatment of beta-type titanium alloy |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN116145065B (en) * | 2023-02-27 | 2024-06-11 | 沈阳工业大学 | Multistage heat treatment method for improving vickers hardness of TC4 titanium alloy additive components |
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