Preparation method and application of large-size titanium steel bimetallic ring piece

Abstract

The present application belongs to the technical field of metal material forming, and particularly relates to a preparation method and application of a large-size titanium steel bimetallic ring piece. The preparation method of the present application prepares a titanium steel bimetallic ring blank by adopting an advanced densification forming hot isostatic pressing technology, uses ring rolling device and rolling dies to perform ring binding on the titanium steel bimetallic ring blank, further adopts an electromagnetic induction heating device to separately heat the material with a high phase change point to a rolling temperature, adopts an infrared temperature measuring instrument to measure the temperature in real time, uses a main roller and a core roller to perform ring rolling on the titanium steel bimetallic ring blank, and prepares a large-size titanium steel bimetallic ring piece. The prepared bimetallic ring piece has a high degree of densification, strong bonding force and large final forming size, can effectively solve the problems of difficult welding, poor bonding force and inability to large-size forming of a traditional large-size bimetallic ring piece, greatly improves the yield of the large-size titanium steel bimetallic ring piece, and greatly reduces the production cost.

Description

Technical Field

[0001] This invention belongs to the field of metal material forming technology, specifically relating to a method for preparing and applying a large-size titanium-steel bimetallic ring. Background Technology

[0002] Titanium-steel bimetallic composite rings have attracted much attention in aerospace, energy equipment and other fields due to their lightweight, corrosion resistance and high strength and toughness. However, traditional composite processes face significant challenges. Titanium alloy (Ti6Al4V) and steel have a large difference in thermal expansion coefficients (approximately 50%), are prone to forming brittle intermetallic compounds (such as TiFe2) at high temperatures, and their rolling temperature windows are mismatched (titanium requires low-temperature oxidation prevention, while steel requires high-temperature plastic forming). This results in poor bonding, high residual stress, and insufficient yield (<70%). Existing technologies such as explosive welding are limited by the shape of the billet, and hot rolling composites cause interface delamination due to temperature conflicts. Diffusion welding has low efficiency and is difficult to scale up. The difference in plastic rheological behavior between titanium and steel in the ring rolling process further exacerbates the asynchronous deformation and cracking risk. Furthermore, the actual application requirements for bimetallic rings are large, and existing forming technologies cannot meet the production needs of large-size rings.

[0003] Although existing studies have shown that bimetallic composite plates can be produced through mechanical meshing, cold rolling pre-composite, followed by hot rolling, or by laser cladding to pre-deposit a titanium alloy layer on a steel substrate and then ring rolling, Chinese patents (patent publication numbers: CN110665969A, CN119237461A, CN118061648A) can produce bimetallic composite plates with a short process, the ring parts cannot be mass-produced, and the size of the final product is limited, making it difficult to control the stability of the production process.

[0004] To avoid poor bonding of bimetallic rings during ring rolling, researchers mainly use mechanical meshing and pre-composite methods to strengthen the bimetallic interface, which has been put into use in bimetallic sheet rolling. However, the production yield and production size are limited, and with the extension of the service time, interface cracking is very likely to occur, affecting product quality.

[0005] To address the technical challenges of bimetallic forming, large temperature differences in bimetallic ring rolling, poor bonding strength, and size limitations in existing technologies, a method for manufacturing titanium-steel bimetallic rings is urgently needed. This paper proposes an innovative solution integrating forming methods, temperature-zone rolling, and online monitoring to overcome the bottleneck in the efficient manufacturing of large-size titanium-steel composite rings, providing support and assurance for the widespread use of large-size titanium-steel bimetallic rings in aerospace, gas turbines, nuclear power, and other fields.

[0006] In view of this, the present invention is hereby proposed. Summary of the Invention

[0007] The purpose of this invention is to overcome the shortcomings of the prior art and provide a method for preparing large-size titanium-steel bimetallic rings and their applications.

[0008] To achieve the above objectives, the present invention provides the following technical solution:

[0009] On the one hand, this invention provides a method for preparing a large-size titanium-steel bimetallic ring, specifically including the following steps:

[0010] Step 1: First, prepare master alloy rods according to the titanium alloy composition, then grind and sieve them, and select titanium alloy powder of a set particle size range as raw material for preparing titanium steel bimetallic rings.

[0011] Step 2: Design a steel ring sleeve of the appropriate size based on the weight and dimensions of the final titanium-steel bimetallic ring;

[0012] Step 3: First, weld, clean, and dry the steel annular sleeve, then fill the steel annular sleeve with titanium alloy powder, and perform vacuuming, degassing, and sealing welding.

[0013] Step 4: After hot isostatic pressing, the steel ring sleeve with sealing welding is machined to remove excess steel ring sleeve from the surface, and obtain titanium steel bimetallic ring blank A.

[0014] Step 5: Heat and hold the titanium-steel bimetallic ring blank A at the specified temperature;

[0015] Step 6: First, perform ring rolling on the heat-insulated titanium steel bimetallic ring billet A according to the corresponding rolling die designed according to the dimensions, and then perform heat treatment to obtain titanium steel bimetallic ring billet B.

[0016] Step 7: Machining the titanium steel bimetallic ring blank B to finally obtain the titanium steel bimetallic ring of the required size.

[0017] Specifically, in step 1, the particle size of the titanium alloy powder is 15μm-250μm, and the loose packing density of the powder needs to be ≥50% of the theoretical density.

[0018] Specifically, in step 2, the steel annular sheath is made of alloy steel.

[0019] Specifically, in step 3, when the sheath is evacuated, it needs to be heated to 400℃-500℃, and the vacuum degree needs to be ≤5.5×10-5Pa.

[0020] Specifically, in step 4, the hot isostatic pressing temperature is 800℃-950℃, the pressure is 130 MPa-150 MPa, and the holding time is 2h-3h.

[0021] Specifically, in step 5, the heating temperature is 950℃-980℃, and the holding time is 0.5h-2h.

[0022] Specifically, in step 6, a ring rolling device and rolling die are used to perform ring rolling on the heat-insulated titanium-steel bimetallic ring billet A. The ring rolling device includes a main roll, a core roll, a magnetic induction heating device, and an infrared thermometer. After the titanium-steel bimetallic ring billet A is heated and heat-insulated, it is placed on the ring rolling device. The magnetic induction heating device heats the material with a high phase transformation point to the rolling temperature. The infrared thermometer measures the temperature in real time. The titanium-steel bimetallic ring billet A is rolled by the cooperation of the main roll and the core roll.

[0023] Specifically, in step 6, the heating temperature during heat treatment is the annealing temperature of the titanium steel bimetallic ring billet A after ring rolling.

[0024] Specifically, in step 7, the excess dimensions of the titanium steel bimetallic ring blank B are removed by machining according to the design dimensions to obtain the titanium steel bimetallic ring of the required dimensions.

[0025] On the other hand, the present invention provides an application of the titanium steel bimetallic ring prepared by the above-described method for large-size titanium steel bimetallic rings, specifically in the fields of aerospace, gas turbines, and nuclear power.

[0026] Compared with the prior art, the technical solution provided by the present invention has the following beneficial effects:

[0027] The preparation method of this invention involves preparing a titanium-steel bimetallic ring blank using advanced densification forming hot isostatic pressing technology. The titanium-steel bimetallic ring blank is then ring-rolled using a ring rolling device and rolling dies. A magnetic induction heating device is used to separately heat the material with a high phase transformation point to the rolling temperature, and an infrared thermometer is used to measure the temperature in real time. The titanium-steel bimetallic ring blank is then ring-rolled using a main roll and a core roll to produce a large-size titanium-steel bimetallic ring. The prepared bimetallic ring has a high degree of densification, strong bonding force, and a large final formed size. This effectively solves the problems of difficult welding, poor bonding force, and inability to form large-size bimetallic rings in traditional methods, significantly improving the yield of large-size titanium-steel bimetallic rings and greatly reducing production costs. Attached Figure Description

[0028] The accompanying drawings are incorporated in and form part of this specification, and together with the description serve to explain the principles of the invention.

[0029] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is a flowchart of the preparation method of the present invention;

[0031] Figure 2 This is a top view of the ring rolling apparatus of the present invention;

[0032] Figure 3 This is a three-dimensional schematic diagram of the ring rolling apparatus of the present invention;

[0033] Figure 4 This is a schematic diagram of the titanium-steel bimetallic ring prepared in Example 1.

[0034] Among them: 1 is the main roll; 2 is the core roll; 3 is the magnetic induction heating device; 4 is stainless steel; 5 is titanium alloy; 6 is an infrared thermometer. Detailed Implementation

[0035] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples consistent with some aspects of the invention as detailed in the appended claims.

[0036] To enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0037] This invention provides a method for preparing a large-size titanium-steel bimetallic ring, specifically including the following steps:

[0038] Step 1: First, prepare master alloy rods according to the titanium alloy composition, then grind and sieve them, and select titanium alloy powder of a set particle size range as raw material for preparing titanium steel bimetallic rings.

[0039] Step 2: Design a steel ring sleeve of the appropriate size based on the weight and dimensions of the final titanium-steel bimetallic ring;

[0040] Step 3: First, weld, clean, and dry the steel annular sleeve, then fill the steel annular sleeve with titanium alloy powder, and perform vacuuming, degassing, and sealing welding.

[0041] Step 4: After hot isostatic pressing, the steel ring sleeve with sealing welding is machined to remove excess steel ring sleeve from the surface, and obtain titanium steel bimetallic ring blank A.

[0042] Step 5: Heat and hold the titanium-steel bimetallic ring blank A at the specified temperature;

[0043] Step 6: First, perform ring rolling on the heat-insulated titanium steel bimetallic ring billet A according to the corresponding rolling die designed according to the dimensions, and then perform heat treatment to obtain titanium steel bimetallic ring billet B.

[0044] Step 7: Machining the titanium steel bimetallic ring blank B to finally obtain the titanium steel bimetallic ring of the required size.

[0045] Specifically, in step 1, the particle size of the titanium alloy powder is 15μm-250μm, and the loose packing density of the powder needs to be ≥50% of the theoretical density.

[0046] Specifically, in step 2, the steel annular sheath is made of alloy steel.

[0047] Specifically, in step 3, when the sheath is evacuated, it needs to be heated to 400℃-500℃, and the vacuum degree needs to be ≤5.5×10-5Pa.

[0048] Specifically, in step 4, the hot isostatic pressing temperature is 800℃-950℃, the pressure is 130 MPa-150 MPa, and the holding time is 2h-3h.

[0049] Specifically, in step 5, the heating temperature is 950℃-980℃, and the holding time is 0.5h-2h.

[0050] Specifically, in step 6, see... Figure 2 and 3 As shown, a ring rolling device and rolling die are used to perform ring rolling on the heat-insulated titanium-steel bimetallic ring billet A. The ring rolling device includes a main roll 1, a core roll 2, a magnetic induction heating device 3, and an infrared thermometer 6. After the titanium-steel bimetallic ring billet A is heated and heat-insulated, it is placed on the ring rolling device. The magnetic induction heating device 3 heats the material with a high phase transformation point (heating stainless steel 4, but not titanium alloy 5) to the rolling temperature. The infrared thermometer 6 measures the temperature in real time. The titanium-steel bimetallic ring billet A is rolled by the cooperation of the main roll 1 and the core roll 2.

[0051] Specifically, in step 6, the heating temperature during heat treatment is the annealing temperature of the titanium steel bimetallic ring billet A after ring rolling.

[0052] Specifically, in step 7, the excess dimensions of the titanium steel bimetallic ring blank B are removed by machining according to the design dimensions to obtain the titanium steel bimetallic ring of the required dimensions.

[0053] To demonstrate the effectiveness of the preparation method of the present invention, the following examples are provided for verification.

[0054] Example 1

[0055] This embodiment provides a method for fabricating a large-size titanium-steel bimetallic ring. The titanium-steel bimetallic ring can be integrally rolled into shape, and the ring size can exceed 1m. The specific fabrication process is as follows:

[0056] Step 1: Using Ti6Al4V master alloy rods, Ti6Al4V titanium alloy powder with a tap density > 50% of the material density is produced by plasma rotating electrode atomization method. The particle size of the Ti6Al4V titanium alloy powder is 15μm-250μm.

[0057] Step 2: Based on the final dimensions of the titanium steel ring, manufacture a 316 stainless steel ring with an inner diameter of 400mm, an outer diameter of 600mm, and a height of 300mm, wherein the thickness of the 316 stainless steel is 100mm.

[0058] Step 3: The welded 316 stainless steel annular sleeve undergoes vacuum heat treatment at 500℃ for 3 hours, followed by furnace cooling to room temperature to remove residual stress from the welding process. Then, anhydrous ethanol is used to clean the interior of the 316 stainless steel annular sleeve of residual weld slag and other foreign matter, followed by drying at 120℃ for 2 hours to remove residual moisture. Ti6Al4V titanium alloy powder with a particle size of 15μm-250μm is then filled into the 316 stainless steel annular sleeve (filling while vibrating). The 316 stainless steel annular sleeve filled with Ti6Al4V titanium alloy powder is then vacuum-degassed (the 316 stainless steel annular sleeve is placed in a heat treatment furnace at 400℃, and vacuumed to <5.0×10⁻⁶). -4 After degassing (Pa), sealing welding is performed.

[0059] Step 4: First, the 316 stainless steel ring sleeve that has passed the sealing weld in Step 3 is subjected to hot isostatic pressing (HIP) treatment. The HIP temperature is 920℃, the heating rate is 5℃ / min, the holding time is 3h, and the temperature is reduced to room temperature at a cooling rate of 8℃ / min. Then, it is machined to obtain Ti6Al4V-316-titanium steel bimetallic ring blank A with dimensions of 400mm (inner diameter) × 600mm (outer diameter) × 300mm (height).

[0060] Step 5: Heat the Ti6Al4V-316-titanium steel bimetallic ring billet A obtained after machining to 950℃ in a heat treatment furnace and hold for 1 hour;

[0061] Step 6: First, heat-insulate the titanium-steel bimetallic ring billet A in the following way... Figure 2 and 3The ring rolling apparatus shown performs ring rolling, in which the magnetic induction heating device 3 heats only the 316 stainless steel area at a heating temperature of 1050℃, the rolling linear speed is 1.0m / s, the deformation amount of the first pass is 15%, and the deformation amount of the second pass is 40%. After ring rolling, a large-sized Ti6Al4V-316 titanium steel bimetallic ring with dimensions of 980mm (inner diameter) × 1200mm (outer diameter) × 350mm (height) is obtained. The large-sized Ti6Al4V-316 titanium steel bimetallic ring is then heated to 650℃ in a heat treatment furnace, held for 1.5h, and then air-cooled to obtain Ti6Al4V-316-titanium steel bimetallic ring billet B.

[0062] Step 7: The Ti6Al4V-316-titanium steel bimetallic ring blank B is machined to remove the surface oxide layer, finally obtaining a Ti6Al4V-316-titanium steel bimetallic ring X with dimensions of approximately 970mm (inner diameter) × 1150mm (outer diameter) × 340mm (height). Figure 4 As shown.

[0063] Example 2

[0064] This embodiment provides a method for fabricating a large-size titanium-steel bimetallic ring. The titanium-steel bimetallic ring can be integrally rolled into shape, and the ring size can exceed 1m. The specific fabrication process is as follows:

[0065] Step 1: Using Ti6242 master alloy rods, Ti6242 titanium alloy powder with a tap density > 50% of the material density is produced by plasma rotating electrode atomization method. The particle size of the Ti6242 titanium alloy powder is 15μm-250μm.

[0066] Step 2: Based on the final titanium steel ring size, manufacture a 42CrMo steel ring sleeve with an inner diameter of 350mm, an outer diameter of 700mm, and a height of 350mm, wherein the thickness of the 42CrMo steel is 100mm.

[0067] Step 3: The welded 42CrMo steel annular cladding is subjected to vacuum heat treatment at 500℃ for 3 hours, followed by furnace cooling to room temperature to remove residual stress from the welding process. Then, anhydrous ethanol is used to clean the interior of the 42CrMo annular cladding of residual weld slag and other foreign matter, followed by drying at 120℃ for 2 hours to remove residual moisture. Ti6242 titanium alloy powder with a particle size of 15μm-250μm is then filled into the 42CrMo annular cladding (filling while vibrating). The annular cladding filled with Ti6242 titanium alloy powder is then vacuum-degassed (the annular cladding is placed in a heat treatment furnace at 450℃, and vacuumed to <5.2×10⁻⁶). -4 After degassing (Pa), sealing welding is performed.

[0068] Step 4: First, perform hot isostatic pressing (HIP) on the annular sleeve that has passed the sealing weld in Step 3. The HIP temperature is 950℃, the heating rate is 5℃ / min, the holding time is 3h, and the temperature is reduced to room temperature at a cooling rate of 8℃ / min. Then, perform machining to obtain Ti6242-42CrMo titanium steel bimetallic ring blank A with dimensions of 330mm (inner diameter) × 680mm (outer diameter) × 380mm (height).

[0069] Step 5: Heat the Ti6242-42CrMo-titanium steel bimetallic ring billet A obtained after machining to 850℃ in a heat treatment furnace and hold for 2 hours;

[0070] Step 6: First, heat-insulate the titanium-steel bimetallic ring billet A in the following way... Figure 2 and 3 The ring rolling apparatus shown performs ring rolling, in which the magnetic induction heating device 3 heats only the 42CrMo steel area at a heating temperature of 1050℃, the rolling linear speed is 1.5m / s, the deformation amount of the first pass is 10%, and the deformation amount of the second pass is 45%. After ring rolling, a large-sized Ti6242-42CrMo titanium steel bimetallic ring with dimensions of 927mm (inner diameter) × 1070mm (outer diameter) × 450mm (height) is obtained. The large-sized Ti6242-42CrMo-titanium steel bimetallic ring is then heated to 600℃ in a heat treatment furnace, held for 1.5h, and then air-cooled to obtain Ti6242-42CrMo-titanium steel bimetallic ring billet B.

[0071] Step 7: The Ti6242-42CrMo-titanium steel bimetallic ring blank B is machined to remove the surface oxide layer, and finally a Ti6242-42CrMo-titanium steel bimetallic ring Y with dimensions of approximately 920mm (inner diameter) × 1150mm (outer diameter) × 330mm (height) is obtained.

[0072] Example 3

[0073] This embodiment provides a method for fabricating a large-size titanium-steel bimetallic ring. The titanium-steel bimetallic ring can be integrally rolled into shape, and the ring size can exceed 1m. The specific fabrication process is as follows:

[0074] Step 1: Using TA2 master alloy rods, TA2 powder with a tap density > 50% of the material density is produced by plasma rotating electrode atomization method. The particle size of the TA2 powder is 15μm-250μm.

[0075] Step 2: Based on the final titanium steel ring size, manufacture a 20 steel ring sleeve with an inner diameter of 700mm, an outer diameter of 900mm, and a height of 300mm, wherein the thickness of the 20 steel is 120mm.

[0076] Step 3: The welded 20mm steel annular sleeve undergoes vacuum heat treatment at 500℃ for 3 hours, followed by furnace cooling to room temperature to remove residual stress from the welding process. Then, anhydrous ethanol is used to clean the inside of the annular sleeve of residual weld slag and other foreign matter, followed by drying at 120℃ for 2 hours to remove residual moisture. Ti6Al4V titanium alloy powder with a particle size of 15μm-250μm is then filled into the 316 stainless steel annular sleeve (filling while vibrating). The annular sleeve filled with Ti6Al4V titanium alloy powder is then vacuum-degassed (the annular sleeve is placed in a heat treatment furnace, heated to 500℃, and vacuumed to <5.5×10⁻⁶). -4 After degassing (Pa), sealing welding is performed.

[0077] Step 4: First, perform hot isostatic pressing (HIP) on the annular sleeve that has passed the sealing weld in Step 3. The HIP temperature is 820℃, the heating rate is 5℃ / min, the holding time is 2h, and the temperature is reduced to room temperature at a cooling rate of 8℃ / min. Then, perform machining to obtain TA2-20 steel titanium steel bimetallic ring blank A with dimensions of 690mm (inner diameter) × 870mm (outer diameter) × 290mm (height).

[0078] Step 5: Heat the machined TA2-20 steel-titanium steel bimetallic ring billet A to 980℃ in a heat treatment furnace and hold for 0.5h;

[0079] Step 6: First, heat-insulate the titanium-steel bimetallic ring billet A in the following way... Figure 2 and 3 The ring rolling apparatus shown performs ring rolling, in which the magnetic induction heating device 3 heats only the 20 steel area at a heating temperature of 1050℃, the linear speed during rolling is 1.0m / s, the deformation amount of the first pass is 15%, and the deformation amount of the second pass is 40%. After ring rolling, a large-size TA2-20 steel-titanium steel bimetallic ring with dimensions of 1050mm (inner diameter) × 1150mm (outer diameter) × 370mm (height) is obtained. The large-size TA2-20 steel-titanium steel bimetallic ring is then heated to 650℃ in a heat treatment furnace, held for 1.5h, and then air-cooled to obtain TA2-20 steel-titanium steel bimetallic ring billet B.

[0080] Step 7: Machining the TA2-20 steel-titanium steel bimetallic ring blank B to remove the surface oxide layer, finally obtaining the TA2-20 steel-titanium steel bimetallic ring Z with dimensions of approximately 1045mm (inner diameter) × 1145mm (outer diameter) × 360mm (height).

[0081] To further demonstrate the effectiveness of the present invention, the titanium-steel bimetallic ring X, titanium-steel bimetallic ring Y, and titanium-steel bimetallic ring Z prepared in the examples were tested as follows:

[0082] The titanium-steel bimetallic rings prepared in Examples 1-3 above were tested and samples were taken. The test results are shown in Table 1 below:

[0083] Table 1

[0084]

[0085] As shown in the table, this preparation method can produce large-sized titanium-steel bimetallic rings with an inner diameter greater than or equal to 920 mm, an outer diameter greater than or equal to 1145 mm, and a height greater than or equal to 330 mm. The prepared titanium-steel bimetallic rings have a density greater than or equal to 99.8% and a bonding strength greater than 500 MPa, meeting the requirements for use in aerospace, gas turbine, nuclear power and other fields.

[0086] The above description is merely a specific embodiment of the present invention, enabling those skilled in the art to understand or implement the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention.

[0087] It should be understood that the present invention is not limited to the content already described above, and various modifications and changes can be made without departing from its scope. The scope of the present invention is limited only by the appended claims.

Claims

1. A method for preparing a large-size titanium-steel bimetallic ring, characterized in that, Specifically, the following steps are included: Step 1: First, prepare master alloy rods according to the titanium alloy composition, then grind and sieve them, and select titanium alloy powder of a set particle size range as raw material for preparing titanium steel bimetallic rings. Step 2: Design a steel ring sleeve of the appropriate size based on the weight and dimensions of the final titanium-steel bimetallic ring; Step 3: First, weld, clean, and dry the steel annular sleeve, then fill the steel annular sleeve with titanium alloy powder, and perform vacuuming, degassing, and sealing welding. Step 4: After hot isostatic pressing of the sealed steel ring sleeve, machine it to remove excess steel ring sleeve from the surface and obtain titanium steel bimetallic ring blank A; the hot isostatic pressing temperature is 800℃-950℃, the pressure is 130 MPa-150 MPa, and the holding time is 2h-3h. Step 5: Heat and hold the titanium-steel bimetallic ring blank A at the specified temperature; The heating temperature is 950℃-980℃, and the holding time is 0.5h-2h; Step 6: First, perform ring rolling on the heat-insulated titanium steel bimetallic ring billet A according to the corresponding rolling die designed according to the dimensions, and then perform heat treatment to obtain titanium steel bimetallic ring billet B. A ring rolling device and rolling dies are used to perform ring rolling on the titanium-steel bimetallic ring billet A after heat preservation. The ring rolling device includes a main roll, a mandrel, a magnetic induction heating device, and an infrared thermometer. After the titanium-steel bimetallic ring billet A is heated and preserved, it is placed on the ring rolling device. The magnetic induction heating device heats the material with a high phase transformation point to the rolling temperature. The infrared thermometer measures the temperature in real time. The titanium-steel bimetallic ring billet A is rolled by the cooperation of the main roll and the mandrel. Step 7: Machining the titanium steel bimetallic ring blank B to finally obtain the titanium steel bimetallic ring of the required size.

2. The preparation method according to claim 1, characterized in that, In step 1, the particle size of the titanium alloy powder is 15μm-250μm, and the loose packing density of the powder needs to be ≥50% of the theoretical density.

3. The preparation method according to claim 1, characterized in that, In step 2, the steel annular sheath is made of alloy steel.

4. The preparation method according to claim 1, characterized in that, In step 3, when evacuating the sheath, it needs to be heated to 400℃-500℃, and the vacuum degree needs to be ≤5.5×10⁻⁶. -5 Pa.

5. The preparation method according to claim 1, characterized in that, In step 6, the heating temperature during heat treatment is the annealing temperature of the titanium steel bimetallic ring billet A after ring rolling.

6. The preparation method according to claim 1, characterized in that, In step 7, the excess dimensions of the titanium steel bimetallic ring blank B are removed by machining according to the design dimensions to obtain the titanium steel bimetallic ring of the required dimensions.

7. The application of the titanium-steel bimetallic ring prepared by the method described in any one of claims 1-6, characterized in that, Applications in aerospace, gas turbine, and nuclear power.

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