CN113249614A - Titanium alloy resistant to high temperature of 700 ℃ and preparation method thereof - Google Patents
Titanium alloy resistant to high temperature of 700 ℃ and preparation method thereof Download PDFInfo
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- C22C14/00—Alloys based on titanium
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- C22C1/03—Making non-ferrous alloys by melting using master alloys
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- 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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Abstract
The invention discloses a high-temperature titanium alloy resistant to 700 ℃ and a preparation method thereof, relates to the technical field of high-temperature titanium alloy material processing, and aims to provide a high-temperature titanium alloy capable of serving at the temperature of 700 ℃ or above. The alloy is composed of Al: 5.0% -7.0%; sn: 3.0% -5.0%; zr: 6.0% -8.0%; mo: 0.4% -1.2%; nb: 0.5% -1.5%; w: 0.5% -1.5%; si: 0.1 to 0.4 percent of Ti, and the balance of Ti. The process comprises the following steps: weighing raw materials according to the components, pressing the raw materials into an electrode, and then smelting by adopting vacuum consumable arc to prepare a high-temperature titanium alloy ingot; the surface defects of the cast ingot are removed, the high-temperature titanium alloy cast ingot is heated to 1000-1100 ℃, the high-temperature titanium alloy cast ingot is forged in the temperature range to obtain a high-temperature titanium alloy forged cake, and the obtained forged cake has excellent tensile strength and plasticity at 700 ℃, and has potential application in aerospace service at 700 ℃.
Description
Technical Field
The invention belongs to the technical field of high-temperature titanium alloy material processing, and particularly relates to a 700 ℃ resistant high-temperature titanium alloy and a preparation method thereof.
Background
With the development of a new generation of hypersonic aircraft, a new extreme challenge is provided for a new generation of heat-resistant titanium alloy, and the titanium alloy is required to be capable of being used at 700 ℃ or even 750 ℃ and has certain strength. In aviation, with the development of a new generation of military aircraft, the thrust-weight ratio of an aircraft engine is improved, the structural weight of the engine needs to be reduced, and the structural efficiency and the gas temperature of the engine need to be improved. Along with the improvement of the flying speed and the compression ratio, the temperature of the outlet of the air compressor is continuously increased and reaches 650 ℃ and above.
Currently, heat resistant titanium alloys have developed over the past century to form a number of mature high temperature titanium alloy grades. However, since the advent of the british IMI834 in 1984, the service temperature of high temperature titanium alloys has not broken 600 ℃ until now, and 600 ℃ is also known as the "thermal barrier" temperature of high temperature titanium alloys. At present, most of heat-resistant titanium alloys are Ti-Al-Sn-Zr-Mo-Si series alloys, and Ti1100 in the United states, IMI834 in the United kingdom, BT18y in Russia and Ti60 in China are representatives of the alloys. However, the above alloys are used only at temperatures of 600 ℃ at the most, and may reach 650 ℃ for a short time. And cannot meet the urgent needs of the aerospace field.
Disclosure of Invention
The invention aims to provide a high-temperature titanium alloy which can be used at 700 ℃ and above, and a high-temperature titanium alloy forged cake with excellent tensile strength and plasticity at 700 ℃ is prepared, so that the urgent problem that the high-temperature titanium alloy can not be used at the temperature of 700 ℃ and 750 ℃ can be solved.
The 700 ℃ high-temperature resistant titanium alloy comprises the following components in percentage by mass: 5.0% -7.0%; sn: 3.0% -5.0%; zr: 6.0% -8.0%; mo: 0.4% -1.2%; nb: 0.5% -1.5%; w: 0.5% -1.5%; si: 0.1 to 0.4 percent and the balance of Ti.
Further, the gold is prepared from Al: 6.0 percent; sn: 4.0 percent; zr: 7.0 percent; mo: 1.1 percent; nb: 0.8 percent; w: 0.8 percent; si: 0.4% and the balance Ti.
Further, the alloy is prepared from Al: 6.0 percent; sn: 4.0 percent; zr: 7.0 percent; mo: 0.8 percent; nb: 1.2 percent; w: 1.2 percent; si: 0.3% and the balance Ti.
Further, the alloy is prepared from Al: 5.0 percent; sn: 3.0 percent; zr: 8.0 percent; mo: 0.4 percent; nb: 1.2 percent; w: 1.2 percent; si: 0.3% and the balance Ti.
Further, the alloy is prepared from Al: 7.0 percent; sn: 5.0 percent; zr: 7.0 percent; mo: 1.0 percent; nb: 1.0 percent; w: 1.0 percent; si: 0.4% and the balance Ti.
The invention relates to a preparation method of a 700 ℃ high-temperature resistant titanium alloy, which is carried out according to the following steps:
step one, preparing a mixture of Al: 5.0% -7.0%; sn: 3.0% -5.0%; zr: 6.0% -8.0%; mo: 0.4% -1.2%; nb: 0.5% -1.5%; w: 0.5% -1.5%; si: weighing Ti-Sn intermediate alloy, sponge zirconium, Al-Mo intermediate alloy, Al-Nb intermediate alloy, Al-W intermediate alloy, Al-Si intermediate alloy, Al bean and sponge titanium as raw materials according to the proportion of 0.1-0.4% and the balance of Ti;
step two, smelting the raw materials weighed in the step one in a vacuum consumable arc smelting mode to obtain an alloy ingot;
step three, removing surface defects of the high-temperature titanium alloy ingot obtained in the step two, and coating an anti-oxidation coating; firstly, preserving heat for 2h at the temperature of 1000-; then forging deformation is carried out at the temperature of 1000-1100 ℃, and the deformation rate is 0.5s-1Pass deformation is 30-40%, and cumulative deformation is 85%; after the forging is finished, the obtained forged cake is subjected to heat preservation at the temperature of 600-700 ℃ for 2h for annealing, and is cooled along with the furnace;
step four, carrying out solid solution aging heat treatment on the forged cake annealed in the step three in a muffle furnace: the temperature of the solution heat treatment is 900-; the aging heat treatment temperature is 650 plus 750 ℃, the heat preservation is carried out for 3-5h, and air cooling is carried out.
Further, in the second step, the raw materials weighed in the first step are pressed into an alloy electrode for smelting, and the smelting times are 2-3 times.
Further, the pressed electrode is then placed in a drying box and dried for 4-8h at the temperature range of 150-.
Further, in the third step, the temperature is firstly preserved for 2 hours at 1050 ℃; followed by forging deformation at 1050 ℃ with a deformation rate of 0.5s-1The pass deformation is 30-40%, and the cumulative deformation is 85%.
Further, the temperature of the solution heat treatment in the fourth step is 920-; the aging heat treatment temperature is 680-720 ℃, and the heat preservation is carried out for 4-5 h.
The invention has the following beneficial effects:
the invention further optimizes the alloy components by adjusting the mass percentage content of alloy elements such as Al, Sn, Zr, Mo, Si and the like on the basis of Ti-Al-Sn-Zr-Mo-Si alloy; aiming at the 700 ℃ heat-resistant service condition, a certain content of Nb, W and other high-temperature-resistant alloy elements are specially added, aiming at improving the high-temperature strength of the alloy at 700 ℃ and above; finally, the alloy component of the material is Ti-Al-Sn-Zr-Mo-Nb-W-Si.
The high-temperature titanium alloy forged cake resistant to 700 ℃ has the advantages that the grain size is obviously refined after forging deformation, the structure is a basket structure, the tensile strength can reach 535.5MPa, the yield strength can reach 489.6MPa, and the elongation percentage is 30.4% under the condition of 700 ℃.
Detailed Description
It will be understood by those of ordinary skill in the art that the foregoing embodiments are specific examples for carrying out the invention, and that various changes in form and details may be made therein without departing from the spirit and scope of the invention in practice.
To make the objects, aspects and advantages of the embodiments of the present invention more apparent, the following detailed description clearly illustrates the spirit of the disclosure, and any person skilled in the art, after understanding the embodiments of the disclosure, may make changes and modifications to the technology taught by the disclosure without departing from the spirit and scope of the disclosure.
Examples
The preparation method of the 700 ℃ high-temperature resistant titanium alloy of the embodiment is carried out according to the following steps:
step one, preparing a composite material by mass ratio of Al: 6.0 percent; sn: 4.0 percent; zr: 7.0 percent; mo: 1.1 percent; nb: 0.8 percent; w: 0.8 percent; si: weighing Ti-Sn intermediate alloy, sponge zirconium, Al-Mo intermediate alloy, Al-Nb intermediate alloy, Al-W intermediate alloy, Al-Si intermediate alloy, Al bean and sponge titanium as raw materials according to the proportion of 0.4 percent and the balance of Ti (the burning loss rate of Al is considered to be 2-10 percent); pressing 80kg of 700 ℃ high-temperature resistant titanium alloy electrode, then placing the pressed electrode in a drying box, and drying for 4-8h at the temperature range of 150-;
step two, smelting the titanium alloy electrode which is dried in the step one and resists the high temperature of 700 ℃ in a vacuum consumable arc smelting furnace for at least 2 times to ensure that the components are uniform, generally smelting for 2-3 times, and finally obtaining the ingot with the size phi of 160mm multiplied by 800 mm;
step three, machining the high-temperature titanium alloy ingot obtained in the step two by a wire cutting machine, a lathe and the like to remove surface defects; taking a core part region of the obtained high-temperature titanium alloy ingot, and preparing a cylindrical forging stock with the size of phi 55mm multiplied by 80mm by wire cutting to prepare for subsequent forging deformation;
a.) pre-forging heat treatment: brushing high-temperature antioxidant coating on the cylindrical forging stock, placing the cylindrical forging stock in a muffle furnace at 100 ℃ for pre-forging heat treatment, preserving heat for 2 hours, and cooling in air, wherein the aim is mainly to homogenize cast structure and eliminate casting defects.
b.) forging deformation: and (3) preserving the heat of the cylindrical sample subjected to the heat treatment before forging for 30min at 1100 ℃, completing forging deformation on an YD 153232S-400 four-column hydraulic press, wherein the maximum pressure is 400 tons, and preheating an upper forging die and a lower forging die to 800 plus 950 ℃ in advance before forging. Strain rate at deformation of 0.5s-1The pass deformation is 30-40%, and the accumulated deformation is 85% after 2-3 times of deformation.
c.) annealing heat treatment after forging: after the forging deformation is completed, the forging cake is placed in a muffle furnace at 650 ℃ for heat preservation for 2 hours and is cooled along with the furnace. The purpose is to relieve the stresses caused by the forging deformation and above all to promote ordering and post-dynamic recrystallization of the substructure.
And step four, in order to further regulate and control the structure and obtain the high-temperature titanium alloy capable of being applied at 700 ℃, further carrying out solid solution aging heat treatment. Preserving the temperature of the forged cake finally obtained in the second embodiment in a muffle furnace at 980 ℃ for 1-3h, and air-cooling; then placing the mixture in a muffle furnace at 700 ℃ for heat preservation for 3-5h, and air cooling.
Through the steps, the grain size of the forged high-temperature titanium alloy is remarkably refined and is reduced from 1700 mu m of an as-cast state to 150-250 mu m of a as-forged state, 20% volume fraction of recrystallized grains exist, and the size of the recrystallized grains is 46 mu m. The obtained structure is a basket structure, and the high-temperature tensile test at 700 ℃ shows that: the tensile strength can reach 535.5MPa, the yield strength can reach 489.6MPa, and the elongation is 30.4%. The high-temperature performance of the titanium alloy is higher than that of the traditional titanium alloy at the high temperature of 600 ℃, and the titanium alloy has the potential of being applied to the service condition of 700 ℃ in aerospace.
Claims (10)
1. The 700 ℃ high-temperature resistant titanium alloy is characterized by comprising the following components in percentage by mass: 5.0% -7.0%; sn: 3.0% -5.0%; zr: 6.0% -8.0%; mo: 0.4% -1.2%; nb: 0.5% -1.5%; w: 0.5% -1.5%; si: 0.1 to 0.4 percent and the balance of Ti.
2. The titanium alloy as claimed in claim 1, wherein the gold is selected from the group consisting of Al: 6.0 percent; sn: 4.0 percent; zr: 7.0 percent; mo: 1.1 percent; nb: 0.8 percent; w: 0.8 percent; si: 0.4% and the balance Ti.
3. The titanium alloy as claimed in claim 1, wherein said alloy is prepared from Al: 6.0 percent; sn: 4.0 percent; zr: 7.0 percent; mo: 0.8 percent; nb: 1.2 percent; w: 1.2 percent; si: 0.3% and the balance Ti.
4. The titanium alloy as claimed in claim 1, wherein said alloy is prepared from Al: 5.0 percent; sn: 3.0 percent; zr: 8.0 percent; mo: 0.4 percent; nb: 1.2 percent; w: 1.2 percent; si: 0.3% and the balance Ti.
5. The titanium alloy as claimed in claim 1, wherein said alloy is prepared from Al: 7.0 percent; sn: 5.0 percent; zr: 7.0 percent; mo: 1.0 percent; nb: 1.0 percent; w: 1.0 percent; si: 0.4% and the balance Ti.
6. The method for preparing the titanium alloy with the high temperature resistance of 700 ℃ according to claim 1 is characterized by comprising the following steps:
step one, preparing a mixture of Al: 5.0% -7.0%; sn: 3.0% -5.0%; zr: 6.0% -8.0%; mo: 0.4% -1.2%; nb: 0.5% -1.5%; w: 0.5% -1.5%; si: weighing Ti-Sn intermediate alloy, sponge zirconium, Al-Mo intermediate alloy, Al-Nb intermediate alloy, Al-W intermediate alloy, Al-Si intermediate alloy, Al bean and sponge titanium as raw materials according to the proportion of 0.1-0.4% and the balance of Ti;
step two, smelting the raw materials weighed in the step one in a vacuum consumable arc smelting mode to obtain an alloy ingot;
step three, removing surface defects of the high-temperature titanium alloy ingot obtained in the step two, and coating an anti-oxidation coating; firstly, preserving heat for 2h at the temperature of 1000-; then forging deformation is carried out at the temperature of 1000-1100 ℃, and the deformation rate is 0.5s-1Pass deformation is 30-40%, and cumulative deformation is 85%; after the forging is finished, the obtained forged cake is subjected to heat preservation at the temperature of 600-700 ℃ for 2h for annealing, and is cooled along with the furnace;
step four, carrying out solid solution aging heat treatment on the forged cake annealed in the step three in a muffle furnace: the temperature of the solution heat treatment is 900-; the aging heat treatment temperature is 650 plus 750 ℃, the heat preservation is carried out for 3-5h, and air cooling is carried out.
7. The method for preparing the titanium alloy resistant to the high temperature of 700 ℃ according to claim 1, wherein the raw materials weighed in the first step are pressed into an alloy electrode to be smelted in the second step, and the smelting frequency is 2-3 times.
8. The method as claimed in claim 7, wherein the pressed electrode is then placed in a drying oven and dried at the temperature range of 150-200 ℃ for 4-8h to remove volatile impurities from the raw material.
9. The method for preparing the titanium alloy with the temperature of 700 ℃ resistance according to the claim 1, characterized in that in the third step, the temperature is firstly preserved at 1050 ℃ for 2 h; followed by forging deformation at 1050 ℃ with a deformation rate of 0.5s-1The pass deformation is 30-40%, and the cumulative deformation is 85%.
10. The method for preparing the titanium alloy with 700 ℃ high temperature resistance according to claim 1, wherein the solution heat treatment temperature in the fourth step is 920-; the aging heat treatment temperature is 680-720 ℃, and the heat preservation is carried out for 4-5 h.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114107733A (en) * | 2021-11-04 | 2022-03-01 | 江西理工大学 | Rare earth microalloyed high-temperature titanium alloy material and preparation method thereof |
| CN116144982A (en) * | 2023-03-14 | 2023-05-23 | 河北工业大学 | High-temperature high-strength titanium alloy for short time and preparation method and application thereof |
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| CN102839297A (en) * | 2012-09-27 | 2012-12-26 | 哈尔滨工业大学 | High-temperature titanium alloy and preparation method thereof |
| US20170146046A1 (en) * | 2015-11-23 | 2017-05-25 | Ati Properties, Inc. | Processing of alpha-beta titanium alloys |
| CN109536777A (en) * | 2019-01-04 | 2019-03-29 | 青海聚能钛业股份有限公司 | A kind of high-temperature titanium alloy and preparation method thereof |
| CN109536775A (en) * | 2019-01-04 | 2019-03-29 | 青海聚能钛业股份有限公司 | A kind of high-temperature titanium alloy and preparation method thereof |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102839297A (en) * | 2012-09-27 | 2012-12-26 | 哈尔滨工业大学 | High-temperature titanium alloy and preparation method thereof |
| US20170146046A1 (en) * | 2015-11-23 | 2017-05-25 | Ati Properties, Inc. | Processing of alpha-beta titanium alloys |
| CN109536777A (en) * | 2019-01-04 | 2019-03-29 | 青海聚能钛业股份有限公司 | A kind of high-temperature titanium alloy and preparation method thereof |
| CN109536775A (en) * | 2019-01-04 | 2019-03-29 | 青海聚能钛业股份有限公司 | A kind of high-temperature titanium alloy and preparation method thereof |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114107733A (en) * | 2021-11-04 | 2022-03-01 | 江西理工大学 | Rare earth microalloyed high-temperature titanium alloy material and preparation method thereof |
| CN116144982A (en) * | 2023-03-14 | 2023-05-23 | 河北工业大学 | High-temperature high-strength titanium alloy for short time and preparation method and application thereof |
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