As-cast ztc4 titanium alloy with micro-alloying and high temperature mechanical property and preparation method thereof

Abstract

The application discloses a kind of microalloying strengthening high temperature mechanical properties as-cast ZTC4 titanium alloy and preparation method, belong to titanium alloy technical field, the as-cast ZTC4 titanium alloy according to mass percentage, including Al:6-6.7%, V:3.6-4.5%, Mo:0.04-0.1%, Zr:0.04-0.1%, Sn:0.04-0.10%, Si:0.1-0.15%, B:0.04-1.0%, the balance is Ti;To titanium alloy ingot is carried out hot isostatic pressing simultaneously and is carried out solid solution treatment, then annealing treatment is carried out, with furnace cooling to 300 DEG C below, then to titanium alloy ingot is carried out aging treatment and is cooled to room temperature, obtain as-cast ZTC4 titanium alloy.The as-cast ZTC4 titanium alloy plasticity does not reduce the condition significantly improves the high temperature strength of as-cast ZTC4 titanium alloy, completely solves the difficult problem of as-cast ZTC4 alloy on complex component application, has higher use value and popularization value.

Description

Technical Field

[0001] This invention relates to the field of titanium alloy technology, specifically to a micro-alloyed ZTC4 titanium alloy with enhanced high-temperature mechanical properties and its preparation method. Background Technology

[0002] Titanium and titanium alloys possess advantages such as high specific strength, excellent corrosion resistance, good high-temperature performance, and low density, making them key materials in modern industry. These advantages allow titanium alloys to be widely used in aerospace, petrochemical, shipbuilding, and architectural decoration. To cope with different working environments, titanium alloys are further classified into α titanium alloys, β titanium alloys, and α+β titanium alloys. α+β type titanium alloys combine the advantages of both α and β titanium alloys, exhibiting high strength, good plasticity, high heat resistance, good corrosion resistance and low-temperature performance, good pressure processing properties, and significantly improved strength through quenching and aging strengthening.

[0003] ZTC4 alloy is currently one of the most widely used duplex titanium alloys both domestically and internationally. Its primary application is as a lightweight, high-temperature structural material in aerospace engines and other applications requiring high temperature and strength in complex working environments. The intricate and complex structure of these components necessitates casting. However, the high-temperature strength of as-cast ZTC4 titanium alloys is low, and unlike simpler structures such as plates, bars, and wires, its high-temperature strength cannot be improved by controlling the microstructure through deformation heat treatment. Alloying by adding alloying elements is the fundamental method to improve the performance of as-cast ZTC4 titanium alloys. However, current research on strengthening as-cast ZTC4 titanium alloys is very limited. The low success rate of achieving the required strength significantly impacts engine lifespan and greatly restricts the industrial use of as-cast ZTC4 titanium alloys.

[0004] Therefore, it is necessary to optimize the composition and processing of as-cast ZTC4 to improve its high-temperature mechanical properties. Summary of the Invention

[0005] To address the problems existing in the prior art, the present invention provides a micro-alloyed ZTC4 titanium alloy with enhanced high-temperature mechanical properties and its preparation method. The as-cast ZTC4 titanium alloy exhibits good high-temperature strength-plasticity matching characteristics at 300℃.

[0006] This invention is achieved through the following technical solution:

[0007] A microalloyed, high-temperature mechanically enhanced as-cast ZTC4 titanium alloy comprises, by mass percentage: Al: 6-6.7%, V: 3.6-4.5%, Mo: 0.04-0.1%, Zr: 0.04-0.1%, Sn: 0.04-0.10%, Si: 0.1-0.15%, B: 0.04-1.0%, with the balance being Ti.

[0008] Preferably, the as-cast ZTC4 alloy is an α+β dual-phase titanium alloy, with TiB whiskers forming in a basket-like structure.

[0009] Preferably, the tensile strength R of the as-cast ZTC4 alloy is... m >670MPa, yield strength R p0.2 >550MPa, elongation A>10%.

[0010] A method for preparing a microalloyed ZTC4 titanium alloy with enhanced high-temperature mechanical properties includes the following steps:

[0011] Step 1: Mix and melt the elements by mass percentage to obtain the initial ZTC4 titanium alloy ingot.

[0012] Step 2: The initial titanium alloy ingot obtained in Step 1 is subjected to hot isostatic pressing and simultaneous solution treatment, followed by annealing and furnace cooling to below 300°C.

[0013] Step 3: After aging treatment, the titanium alloy ingot obtained in Step 2 is cooled to room temperature to obtain as-cast ZTC4 titanium alloy.

[0014] Preferably, in step 2, the initial ZTC4 titanium alloy ingot is subjected to hot isostatic pressing under a gas pressure greater than 120 MPa.

[0015] Preferably, the solution treatment in step 2 is performed at a temperature of 910℃-930℃ for 2-2.5 hours.

[0016] Preferably, the annealing treatment is performed at a temperature of 730°C for 2.5 hours.

[0017] Preferably, the aging process in step 3 involves holding the titanium alloy ingot at 750°C for 2 hours.

[0018] Preferably, in step 1, the elements are smelted using a vacuum induction suspension melting method, and the ingot is repeatedly remelted three times. The smelting power is controlled at 160-180KW to obtain the desired titanium alloy ingot.

[0019] Compared with the prior art, the present invention has the following beneficial technical effects:

[0020] This invention provides a micro-alloying enhancement of the high-temperature mechanical properties of as-cast ZTC4 titanium alloy. The high-temperature strength of the as-cast ZTC4 titanium alloy is fundamentally improved through the optimization of its alloy composition design and the precise addition and adjustment of alloying elements. The composition optimization fully utilizes the properties of Al to improve the alloy's thermal strength by increasing its content. Since V is a fast-diffusing element, its strength decreases at high temperatures, therefore its addition amount is reduced. Furthermore, Zr and Sn are neutral elements, and Zr can improve its processing performance and thermal stability. The addition of a small amount of Si allows for solid solution strengthening in the titanium alloy, and the formation of silicides further enhances its high-temperature strength. Adding 0.04%-1.0% boron (B) lowers the melting point at the solid-liquid interface by utilizing the low solubility of B in the TC4 titanium alloy melt, promoting the nucleation process and increasing the nucleation rate. This allows B to dissolve in the as-cast ZTC4 titanium alloy matrix, fundamentally refining the grain size of the as-cast ZTC4 titanium alloy ingot. While ensuring that the plasticity of the as-cast ZTC4 titanium alloy is not reduced, the high-temperature strength of the as-cast ZTC4 titanium alloy is significantly improved. This completely solves the problem of applying as-cast ZTC4 alloy to complex components. The process is simple and the method is easy to operate.

[0021] This invention provides a method for preparing the aforementioned titanium alloy, employing hot isostatic pressing followed by annealing. The material is encapsulated, pressurized, and held at a temperature in a specially designed enclosure, which significantly reduces shrinkage cavities and porosity in castings, reduces the number of alloy heat treatment steps, and greatly improves operational simplicity. This method significantly improves the high-temperature strength of as-cast ZTC4 titanium alloy, exhibiting good matching between high-temperature strength and plasticity. The resulting ZTC4 exhibits a tensile strength R0 at 300℃. m >670MPa, yield strength R p0.2 >550MPa, elongation A>10%. Attached Figure Description

[0022] Figure 1 This is a microstructure of the as-cast ZTC4 titanium alloy after aging in step 3 of Embodiment 1 of the present invention;

[0023] Figure 2 This is the tensile curve of Embodiment 1 of the present invention at 300°C;

[0024] Figure 3 This is the tensile curve of Embodiment 4 of the present invention at 300°C;

[0025] Figure 4 This is the tensile curve of Embodiment 5 of the present invention at 300°C;

[0026] Figure 5 This is the tensile curve of Embodiment 6 of the present invention under 300°C conditions. Detailed Implementation

[0027] The present invention will now be described in further detail with reference to the accompanying drawings. These descriptions are intended to explain the invention and not to limit it.

[0028] A microalloyed, high-temperature mechanically enhanced as-cast ZTC4 titanium alloy comprises, by mass percentage: Al: 6-6.7%, V: 3.6-4.5%, Mo: 0.04-0.1%, Zr: 0.04-0.1%, Sn: 0.04-0.10%, Si: 0.1-0.15%, B: 0.04-1.0%, with the balance being Ti.

[0029] The Ti is pure titanium or sponge titanium, the Zr is pure zirconium or sponge zirconium, the purity of the sponge titanium is 99.5%, the purity of the sponge zirconium is 99.5%, the purity of the aluminum briquettes is 99.5%, the purity of the high-purity silicon is 99.9%, and the purity of the high-purity boron is 99.9%.

[0030] The as-cast ZTC4 alloy is a dual-phase titanium alloy with a typical basketweave structure, and TiB whiskers (such as...) were observed in its metallographic image and scanning electron microscope image. Figure 1 As shown), the darker colored areas are the α phase, and the lighter colored areas are the β phase (as shown). Figure 1 (as shown in c). The tensile strength R of the as-cast ZTC4 titanium alloy at 300℃ m >670MPa, yield strength R p0.2 >550MPa, elongation A>10%.

[0031] This microalloyed, high-temperature mechanically enhanced as-cast ZTC4 titanium alloy fully utilizes the property of Al to improve the alloy's hot strength, adding Al at its maximum allowable level. V, being a fast-diffusion element, reduces the alloy's strength at high temperatures, therefore its amount is minimized, at its minimum allowable level. Zr and Sn are neutral elements, with Zr improving its machinability and thermal stability. A small amount of Si is added; Si's solid solution in the titanium alloy provides solid solution strengthening, and the formation of silicides enhances high-temperature strength. Adding 0.04%-1.0% B utilizes its low solubility in the TC4 titanium alloy melt to lower the melting point at the solid-liquid interface, promoting the nucleation process and increasing the nucleation rate. This allows B to dissolve in the as-cast ZTC4 titanium alloy matrix, fundamentally refining the grain size of the as-cast ZTC4 titanium alloy ingot. This significantly improves the high-temperature strength of the as-cast ZTC4 titanium alloy without reducing its plasticity.

[0032] A method for preparing a microalloyed ZTC4 titanium alloy with enhanced high-temperature mechanical properties includes the following steps:

[0033] Step 1: Mix and melt the elements according to their mass percentages to obtain ZTC4 titanium alloy ingots.

[0034] Specifically, the preparation of alloy raw materials: weigh out grade 0 sponge titanium, aluminum briquettes, Al-V master alloy, Al-Mo, sponge zirconium, Ti-Sn master alloy, high-purity silicon, and high-purity boron powder according to the weight percentage of each element in the alloy as raw materials for alloy smelting.

[0035] The raw materials were symmetrically sampled and melted using a vacuum induction levitation melting method. To ensure the accuracy and uniformity of the alloy composition, the ingot was repeatedly remelted three times. The melting power was controlled at 160-180KW. After all the material was melted, the melt was allowed to suspend for 60-100 seconds, then allowed to cool naturally. After the third remelting, it was poured to obtain the required titanium alloy ingot.

[0036] Step 2 involves simultaneously hot isostatic pressing and solution treatment of the titanium alloy ingot obtained in Step 1, followed by annealing and furnace cooling to below 300°C. The specific process includes the following steps:

[0037] S2.1, the titanium alloy ingot obtained in step 1 is subjected to hot isostatic pressing and solution treatment simultaneously under an argon pressure greater than 120 MPa. The solution treatment temperature is 910℃-930℃ and the time is 2-2.5H. The hot isostatic pressing treatment fully eliminates casting defects such as shrinkage cavities and porosity in the ingot.

[0038] S2.2, the titanium alloy ingot after hot isostatic pressing is annealed at 730℃ for 2.5 hours, and then cooled to below 300℃ in the furnace.

[0039] Step 3: After aging treatment, the titanium alloy ingot obtained in Step 2 is cooled to room temperature to obtain as-cast ZTC4 titanium alloy.

[0040] The aging process involves holding the titanium alloy ingot at 750℃ for 2 hours and then air-cooling it to room temperature to obtain the as-cast ZTC4 titanium alloy.

[0041] Example 1

[0042] A method for preparing a microalloyed ZTC4 titanium alloy with enhanced high-temperature mechanical properties includes the following steps:

[0043] Step 1: Weigh out the following components by mass percentage: Al: 6.7%, V: 3.6%, Mo: 0.08%, Zr: 0.08%, Sn: 0.08%, Si: 0.14%, B: 0.08%, and the balance Ti.

[0044] Step 2: Place the raw materials weighed in Step 1 into a water-cooled copper crucible vacuum induction levitation melting furnace for melting. To ensure the accuracy and uniformity of the alloy composition, the ingot is repeatedly remelted three times. The melting power is controlled at 160KW. After all the materials have melted, the melt is allowed to stand and levitate for 60 seconds, then naturally cooled. After the third remelting, it is cast to obtain a titanium alloy ingot.

[0045] Step 3: Hot isostatic pressing of titanium alloy ingots under argon pressure of 120 MPa and simultaneous solution treatment at 910°C for 2 hours, followed by annealing and furnace cooling to below 300°C.

[0046] Step 4: The titanium alloy ingot obtained in Step 3 is subjected to aging treatment at 750℃ for 2 hours, and then air-cooled to obtain as-cast ZTC4 titanium alloy.

[0047] The microalloyed as-cast ZTC4 alloy prepared according to the above method is a dual-phase titanium alloy with a typical basketweave structure, and TiB whiskers (such as...) were observed in its metallographic image and scanning electron microscope image. Figure 1 As shown), the darker colored areas are the α phase, and the lighter colored areas are the β phase (as shown). Figure 1 (As shown in c). The properties of the as-cast ZTC4 titanium alloy were tested at 300℃. The tensile strength Rm > 670 MPa, the yield strength Rp0.2 > 550 MPa, and the elongation A > 10%.

[0048] Example 2

[0049] A method for preparing a microalloyed ZTC4 titanium alloy with enhanced high-temperature mechanical properties includes the following steps:

[0050] Step 1: Weigh out the following ingredients by mass percentage: Al: 6%, V: 4.5%, Mo: 0.04%, Zr: 0.1%, Sn: 0.1%, Si: 0.15%, B: 0.1%, and the balance Ti.

[0051] Step 2: Place the raw materials weighed in Step 1 into a water-cooled copper crucible vacuum induction levitation melting furnace for melting. To ensure the accuracy and uniformity of the alloy composition, the ingot is repeatedly remelted three times. The melting power is controlled at 160KW. After all the materials have melted, the melt is allowed to stand and levitate for 60 seconds, then naturally cooled. After the third remelting, it is cast to obtain a titanium alloy ingot.

[0052] Step 3: The titanium alloy ingot is subjected to hot isostatic pressing and simultaneous solution treatment under argon pressure of 150 MPa. The solution treatment temperature is 920℃ and the time is 2.2 hours. Then, it is annealed and cooled to below 300℃ in the furnace.

[0053] Step 4: The titanium alloy ingot obtained in Step 3 is subjected to aging treatment at 750℃ for 2 hours, and then air-cooled to obtain as-cast ZTC4 titanium alloy.

[0054] Example 3

[0055] A method for preparing a microalloyed ZTC4 titanium alloy with enhanced high-temperature mechanical properties includes the following steps:

[0056] Step 1: Weigh out Al: 6.5%, V: 4%, Mo: 0.1%, Zr: 0.04%, Sn: 0.04%, Si: 0.1%, B: 0.04%, and the balance Ti by mass percentage.

[0057] Step 2: Place the raw materials weighed in Step 1 into a water-cooled copper crucible vacuum induction levitation melting furnace for melting. To ensure the accuracy and uniformity of the alloy composition, the ingot is repeatedly remelted three times. The melting power is controlled at 160KW. After all the materials have melted, the melt is allowed to stand and levitate for 60 seconds, then naturally cooled. After the third remelting, it is cast to obtain a titanium alloy ingot.

[0058] Step 3: The titanium alloy ingot is subjected to hot isostatic pressing and simultaneous solution treatment under argon pressure of 200 Pa. The solution treatment temperature is 930℃ and the time is 2.5 hours. Then, it is annealed and cooled to below 300℃ in the furnace.

[0059] Step 4: The titanium alloy ingot obtained in Step 3 is subjected to aging treatment at 750℃ for 2 hours, and then air-cooled to obtain as-cast ZTC4 titanium alloy.

[0060] Example 4

[0061] A method for preparing a microalloyed ZTC4 titanium alloy with enhanced high-temperature mechanical properties includes the following steps:

[0062] Step 1: Weigh out Ti with Al: 6.0% and V: 4.0% as the remainder, by mass percentage.

[0063] Step 2: Place the raw materials weighed in Step 1 into a water-cooled copper crucible vacuum induction levitation melting furnace for melting. To ensure the accuracy and uniformity of the alloy composition, the ingot is repeatedly remelted three times. The melting power is controlled at 160KW. After all the materials have melted, the melt is allowed to stand and levitate for 60 seconds, then naturally cooled. After the third remelting, it is cast to obtain a titanium alloy ingot.

[0064] Step 3: The titanium alloy ingot is subjected to hot isostatic pressing and simultaneous solution treatment under argon pressure of 120 MPa. The hot isostatic pressing and solution treatment temperature is 910℃, and the holding time is 2 hours. Then, annealing treatment is performed, and the ingot is cooled to below 300℃ in the furnace.

[0065] Step 4: The titanium alloy ingot obtained in Step 3 is subjected to aging treatment at 750℃ for 2 hours, and then air-cooled to obtain as-cast ZTC4 titanium alloy.

[0066] The microalloyed as-cast ZTC4 alloy prepared according to the above method is a dual-phase titanium alloy with a typical basketweave structure. Performance tests were conducted on this as-cast ZTC4 titanium alloy at 300℃. The tensile strength Rm was 516 MPa, the yield strength Rp0.2 was 380 MPa, and the elongation A > 10% (e.g., ...). Figure 3 (As shown). Compared to Example 1, without any microalloying, the mechanical properties of the alloy at high temperatures decreased sharply. In other words, the method of this invention can significantly improve the high-temperature mechanical properties of as-cast ZTC4 titanium alloy through microalloying.

[0067] Example 5

[0068] A measure to improve the high-temperature mechanical properties of as-cast ZTC4 titanium alloy and its preparation method, comprising the following steps:

[0069] Step 1: Weigh out the following components by mass percentage: Al: 6.7%, V: 3.6%, Mo: 0.08%, Zr: 0.08%, Si: 0.14%, and the balance Ti.

[0070] Step 2: Place the raw materials weighed in Step 1 into a water-cooled copper crucible vacuum induction levitation melting furnace for melting. To ensure the accuracy and uniformity of the alloy composition, the ingot is repeatedly remelted three times. The melting power is controlled at 160KW. After all the materials have melted, the melt is allowed to stand and levitate for 60 seconds, then naturally cooled. After the third remelting, it is cast to obtain a titanium alloy ingot.

[0071] Step 3: The titanium alloy ingot is subjected to hot isostatic pressing and simultaneous solution treatment under argon pressure of 120 MPa. The solution treatment temperature is 910℃ and the time is 2 hours. Then, it is annealed and cooled to below 300℃ in the furnace.

[0072] Step 4: The titanium alloy ingot obtained in Step 3 is subjected to aging treatment at 750℃ for 2 hours, and then air-cooled to obtain as-cast ZTC4 titanium alloy.

[0073] The microalloyed as-cast ZTC4 alloy prepared according to the above method is a dual-phase titanium alloy with a typical basketweave structure. Performance tests were conducted on this as-cast ZTC4 titanium alloy at 300℃. The tensile strength Rm was 668 MPa, the yield strength Rp0.2 was 495 MPa, and the elongation A > 10% (e.g., ...). Figure 4 (As shown). Compared to Example 1, which removed element B, the alloy exhibited a significant decrease in mechanical properties at high temperatures. In other words, the method of this invention, through microalloying, can significantly improve the high-temperature mechanical properties of as-cast ZTC4 titanium alloy.

[0074] Example 6

[0075] A measure to improve the high-temperature mechanical properties of as-cast ZTC4 titanium alloy and its preparation method, comprising the following steps:

[0076] Step 1: Weigh out the following components by mass percentage: Al: 6.7%, V: 3.6%, Mo: 0.08%, Zr: 0.08%, Sn: 0.09%, Si: 0.14%, B: 0.08%, and the balance Ti.

[0077] Step 2: Place the raw materials weighed in Step 1 into a water-cooled copper crucible vacuum induction levitation melting furnace for melting. To ensure the accuracy and uniformity of the alloy composition, the ingot is repeatedly remelted three times. The melting power is controlled at 160KW. After all the materials have melted, the melt is allowed to stand and levitate for 60 seconds, then naturally cooled. After the third remelting, it is cast to obtain a titanium alloy ingot.

[0078] Step 3: The obtained titanium alloy ingot is subjected to solution treatment at a temperature of 925℃ for 2.4 hours, followed by annealing and furnace cooling to below 300℃.

[0079] Step 4: The titanium alloy ingot obtained in Step 3 is subjected to aging treatment at 750℃ for 2 hours, and then air-cooled to obtain as-cast ZTC4 titanium alloy.

[0080] The microalloyed as-cast ZTC4 alloy prepared according to the above method is a dual-phase titanium alloy with a typical basketweave structure. Performance tests were conducted on this as-cast ZTC4 titanium alloy at 300℃. The tensile strength Rm was 615 MPa, the yield strength Rp0.2 was 440 MPa, and the elongation A > 10% (e.g., ...). Figure 5 (As shown). Compared to Example 1, without the hot isostatic pressing and annealing process, the mechanical properties of the alloy at high temperatures are significantly reduced. In other words, the method of this invention can significantly improve the high-temperature mechanical properties of the as-cast ZTC4 titanium alloy.

[0081] This invention provides a method for improving the high-temperature mechanical properties of as-cast ZTC4 titanium alloy and its preparation method. The composition of the titanium alloy is optimized by adding trace elements and controlling their composition. A hot isostatic pressing and annealing heat treatment process is used to effectively eliminate casting defects such as shrinkage cavities and porosity in the ingot. Simultaneously, the titanium alloy undergoes solution treatment. The micro-alloyed as-cast ZTC4 titanium alloy obtained by this method significantly improves the alloy's high-temperature strength while maintaining high elongation. At 300℃, it exhibits significantly higher strength and elongation, with excellent overall performance. At 300℃, the micro-alloyed as-cast ZTC4 titanium alloy shows a 43.99% increase in tensile strength and a 46.3% increase in yield strength compared to the original ZTC4 ingot. This solves the problem of low high-temperature strength in as-cast ZTC4 titanium alloy, and the material meets the requirements of GJB2896A-2007 "Specification for Titanium and Titanium Alloy Investment Castings," thus satisfying the needs of the aerospace industry.

[0082] The above content is only for illustrating the technical concept of the present invention and should not be construed as limiting the scope of protection of the present invention. Any modifications made to the technical solution based on the technical concept proposed in this invention shall fall within the scope of protection of the claims of this invention.

Claims

1. A microalloyed, high-temperature mechanically enhanced as-cast ZTC4 titanium alloy, characterized in that, By mass percentage, it includes Al: 6-6.7%, V: 3.6-4.5%, Mo: 0.04-0.1%, Zr: 0.04-0.1%, Sn: 0.04-0.10%, Si: 0.1-0.15%, B: 0.04-1.0%, with the balance being Ti; The as-cast ZTC4 alloy is an α+β dual-phase titanium alloy with TiB whiskers forming a basket-like structure in its microstructure. The tensile strength R of the as-cast ZTC4 alloy m >670MPa, yield strength R p0.2 >550MPa, elongation A>10%.

2. A method for preparing a microalloyed, high-temperature mechanically enhanced as-cast ZTC4 titanium alloy as described in claim 1, characterized in that, Includes the following steps: Step 1: Mix and melt the elements by mass percentage to obtain the initial ZTC4 titanium alloy ingot. Step 2: The initial titanium alloy ingot obtained in Step 1 is subjected to hot isostatic pressing and simultaneous solution treatment, followed by annealing and furnace cooling to below 300°C. Step 3: After aging treatment, the titanium alloy ingot obtained in Step 2 is cooled to room temperature to obtain as-cast ZTC4 titanium alloy.

3. The method for preparing a microalloyed, high-temperature mechanically enhanced as-cast ZTC4 titanium alloy according to claim 2, characterized in that, In step 2, the initial ZTC4 titanium alloy ingot is subjected to hot isostatic pressing under a gas pressure greater than 120 MPa.

4. The method for preparing a microalloyed, high-temperature mechanically enhanced as-cast ZTC4 titanium alloy according to claim 2, characterized in that, The solution treatment in step 2 is performed at a temperature of 910℃-930℃ for 2-2.5 hours.

5. The method for preparing a microalloyed, high-temperature mechanically enhanced as-cast ZTC4 titanium alloy according to claim 2, characterized in that, The annealing process was carried out at a temperature of 730°C for 2.5 hours.

6. The method for preparing a microalloyed, high-temperature mechanically enhanced as-cast ZTC4 titanium alloy according to claim 2, characterized in that, The aging process described in step 3 involves holding the titanium alloy ingot at 750°C for 2 hours.

7. The method for preparing a microalloyed, high-temperature mechanically enhanced as-cast ZTC4 titanium alloy according to claim 2, characterized in that, In step 1, the elements are smelted using a vacuum induction suspension melting method. The ingot is repeatedly remelted three times, and the melting power is controlled at 160-180KW to obtain the required titanium alloy ingot.

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