Hot isostatic pressing forming method for additive manufacturing based on in-situ powder filling

Abstract

The invention provides an additive manufacturing hot isostatic pressing forming method based on in-situ powder filling, and belongs to the technical field of titanium alloy forming manufacturing. A near-net forming HIP sheath is designed on the basis of a reverse optimization technology, accurate and rapid forming of a pre-HIP prefabricated part is achieved through an additive manufacturing technology, meanwhile, powder filling is conducted layer by layer, and the forming precision of the pre-HIP prefabricated part is improved. The expected period is reduced by 50-80%, and all-around improvement of efficiency, including improvement of time efficiency, material efficiency, quality qualification rate and design degree of freedom, is realized; on the basis of the additive manufacturing technology, the additive manufacturing technology is combined with the HIP pretreatment process of sheath manufacturing and powder filling, layer-by-layer powder filling is achieved while sheath layer-by-layer printing is achieved, the procedures of the HIP pretreatment process are reduced to a great extent, the problems that the prefabricated body preparation period is long and the procedures are multiple before HIP are solved, and the production efficiency of the prefabricated body is improved. And a new stage of application and popularization of the additive manufacturing technology in the HIP is realized.

Description

Technical Field

[0001] This invention relates to the field of titanium alloy forming and manufacturing technology, and specifically to a hot isostatic pressing forming method based on in-situ powder filling additive manufacturing. Background Technology

[0002] Titanium alloys are excellent lightweight metal alloys, widely used in key components in the aerospace field due to their superior comprehensive properties such as low density, high specific strength, high fracture toughness, and strong corrosion resistance. However, current technologies for processing titanium alloys suffer from limitations including complex processing procedures, low material utilization, difficulty in controlling microstructure and properties, and challenges in manufacturing complex structures.

[0003] Encasing is a core bottleneck in the application of hot isostatic pressing (HIP) technology, and the quality of the encasing directly determines the success or failure of HIP. During the HIP process, pressure is applied to the outer surface of the encasing, and the pressure is transmitted to the interior of the powder through the contraction of the encasing, making the powder completely dense.

[0004] In existing technologies, the sleeve needs to leave enough margin, and after HIP, the warped part caused by shrinkage deformation needs to be removed by machining, which greatly increases the processing cycle and overall cost of the parts.

[0005] However, the sleeves produced by existing machining and welding methods are difficult to form, have low dimensional accuracy, and account for a large proportion of the total cycle and cost of HIP forming. They have low forming efficiency, high processing cost, and the number and distribution of welds affect forming stability.

[0006] In particular, for complex-shaped claddings after reverse optimization, existing processing methods are poorly adapted to complex shapes. The large number and asymmetrical distribution of welds reduce the thermal stability of the cladding and increase the risk of air leakage.

[0007] Powder filling of complex-shaped enclosures still faces significant challenges. Excessive corners and variable cross-sections make powder filling difficult, which will affect the quality of the final HIP-formed parts. Summary of the Invention

[0008] In view of the above problems, this invention proposes a hot isostatic pressing (HIP) method based on in-situ powder filling additive manufacturing. This invention designs a near-net-shape HIP casing based on reverse optimization technology. Through additive manufacturing technology, it achieves precise and rapid prototyping of the pre-formed component before HIP while simultaneously filling powder layer by layer. The cycle time is expected to be reduced by 50-80%, achieving a comprehensive improvement in efficiency, including time efficiency, material efficiency, quality pass rate, and design freedom. This invention combines additive manufacturing technology with the HIP pre-processing flow of casing manufacturing and powder filling, enabling layer-by-layer printing and powder filling of the casing. This significantly reduces the number of steps in the HIP pre-processing flow, solving the problems of long pre-formed component preparation cycles and numerous steps before HIP, and realizing a new stage in the application and promotion of additive manufacturing technology in HIP.

[0009] This invention provides a rapid hot isostatic pressing method for titanium alloys based on additive manufacturing cladding, comprising: Step 1: Calculate the deformation shrinkage rate of the powder based on the dimensions of the target part, and design a conformal sleeve that matches the shape of the target part; A prefabricated model of HIP (High-Intensity Integrated Circuit) is established using CAD software, including a powder model and a conformal encapsulation model, wherein the powder model and the conformal encapsulation model form an encapsulation structure; The prefabricated model before HIP is meshed and inversely optimized to obtain the inversely optimized prefabricated model. Numerical simulations were performed using MSC.marc software to obtain simulation parameters for the hot isostatic pressing process. Step 2: Design the placement angle and structural support of the prefabricated model after reverse optimization; Along the height direction, the reverse-optimized prefabricated model is sliced ​​into equal-height layers along the z-axis to obtain a series of two-dimensional contour information; Based on the two-dimensional contour information and scanning strategy, a corresponding printing scanning path for laser selective melting SLM is generated; Step 3: Prepare spherical titanium alloy powder and dry it; Step 4: Perform powder spreading and compaction treatment on each two-dimensional slice to obtain the powder bed ready for printing; The laser selectively melts the powder in the powder bed to be printed according to a preset scanning path; Step 5: Remove the external supports of the precast component, heat it, and simultaneously perform internal vacuuming. After vacuuming is completed, the casing is immediately sealed by welding. Step 6: Perform hot isostatic pressing (HIP) on the preform after sealing and welding to obtain the shaped part.

[0010] Optionally, the simulation parameters include relative density, stress, and strain.

[0011] Optionally, the reverse-optimized preform model includes an outer shell and an internal powder cavity.

[0012] Optionally, the scanning strategy for slices containing a bezel region employs a combination of contour offset scanning and internal filling scanning. Using a contour offset scanning method, the laser scans 1-2 circles along the inner and outer boundaries of the casing contour to ensure the clarity and compactness of the contour and guarantee the airtightness of the casing. The encapsulated solid area is internally filled by scanning with stripe scanning or checkerboard scanning. The scanning path direction is rotated 67° or 90° between adjacent layers to reduce anisotropy and internal stress.

[0013] Optionally, the laser spot diameter of the scanning path is 90-110μm, the scanning laser power is 200-350W, the scanning spacing is 0.08-0.12mm, and the scanning speed is 700-1200 mm / s.

[0014] Optionally, the reverse-optimized preform model is placed on the forming platform at a certain tilt angle; The tilt angle refers to the angle between the model's main axis and the XY plane of the forming platform.

[0015] Optionally, an external support structure design is adopted, whose main functions include: resisting deformation caused by molding thermal stress, ensuring the geometric accuracy of the casing, and providing necessary physical support for tilted models; The external support is a composite support structure that combines block support and linear support.

[0016] Optionally, the powder particle size is 15μm-53μm, the sphericity is >95%, and the bulk density is ≥40%.

[0017] Optionally, the HIP process includes: placing the prefabricated component in a HIP device and heating and pressurizing it for 1.5-3 hours to bring the device temperature to 900-940°C.

[0018] Optionally, it also includes: pressing the internal pressure to 100-150MPa, maintaining the temperature and pressure for 2-4 hours, and then cooling and depressurizing for 1.5-3 hours.

[0019] Compared with the prior art, the present invention has at least the following beneficial effects: (1) This invention employs reverse optimization technology, analyzes the shrinkage and deformation of the HIP process casing, and uses an optimization algorithm to compensate for the size of the casing shrinkage portion, thereby achieving near-net-shape forming in one HIP process. The part formed after reverse optimization can directly realize powder-to-target part forming, greatly reducing the processing cycle and overall cost of the part; (2) The rapid prototyping of HIP sleeves in this invention adopts additive manufacturing technology, which is a digital manufacturing technology that constructs a three-dimensional solid by stacking materials layer by layer. It is particularly suitable for complex structural parts. It meets the processing requirements of complex-shaped sleeves designed by reverse optimization.

[0020] Additive manufacturing technology has broken through the limitations of traditional processes by improving adaptability to complex shapes, increasing manufacturing precision, reducing processing cycles, enhancing the thermal stability of the casing, and reducing the risk of air leakage. It has shortened the parts manufacturing cycle, increased material utilization, and reduced parts manufacturing costs, and has excellent adaptability to the processing of complex casings. (3) The rapid powder loading method for HIP sleeves of the present invention innovatively combines the technical characteristics of laser selective melting (SLM) technology with layer-by-layer powder laying, and performs powder filling and sleeve manufacturing simultaneously, which greatly improves the powder loading efficiency of complex-shaped sleeves and significantly shortens the manufacturing cycle. Compared with the conventional solution of manufacturing the sleeve first and then filling it with powder, the rapid powder loading method for HIP sleeves of the present invention avoids the problems of insufficient powder loading and low efficiency of the conventional solution by laying powder layer by layer and compacting it, simplifies the cumbersome powder loading process, and greatly reduces the processing cycle and overall cost of parts. Attached Figure Description

[0021] The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of the invention.

[0022] Figure 1 This is a schematic diagram of the additive manufacturing process based on in-situ filled powder according to the present invention; Figure 2 A schematic diagram of reverse optimization for manufacturing a TC4 titanium alloy spiral structure part as an example of the present invention; Figure 3 This is a schematic diagram illustrating the pre-fabrication process of a TC4 titanium alloy spiral structure part manufactured using in-situ powder filling additive manufacturing technology, as an example of the present invention. Detailed Implementation

[0023] To better understand the above-described objectives, features, and advantages of the present invention, the invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments of the present invention and the features thereof can be combined with each other. Furthermore, the present invention can be implemented in other ways different from those described herein; therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0024] A specific embodiment of the present invention, such as Figure 1-3 A rapid prototyping method for titanium alloys based on additive manufacturing cladding is disclosed, comprising the following steps: Step 1: Calculate the deformation shrinkage rate of the powder based on the dimensions of the target part, and design a conformal sleeve that matches the shape of the target part; A prefabricated model of HIP (High-Intensity Integrated Circuit) is established using CAD software, including a powder model and a conformal encapsulation model, wherein the powder model and the conformal encapsulation model form an encapsulation structure; The prefabricated model before HIP is meshed and inversely optimized to obtain the inversely optimized prefabricated model. Numerical simulations were performed using MSC.marc software to obtain simulation parameters for the hot isostatic pressing process; optionally, the simulation parameters include relative density, stress, and strain; these parameters are used to analyze the encapsulation deformation, density changes, and stress distribution results during the forming process.

[0025] Optionally, based on the inverse optimization algorithm, the design sensitivity is used to represent the derivative of the object function with respect to design variables (point set coordinates, etc.). The design sensitivity is calculated using the direct differentiation method and iteratively optimized using the gradient descent method. The optimized model point set coordinates are output to establish the model, and finite element simulation is performed. Based on the simulation results, the dimensional error between the formed part and the target part is calculated. Repeat the above optimization process 2-3 times until the dimensional error is less than 0.5mm and the relative density of the formed part reaches more than 95%. This is used as the final prefabricated model before HIP.

[0026] Optionally, the reverse-optimized preform model includes an outer shell and an internal powder cavity; Step 2: Design the placement angle and structural support of the prefabricated model after reverse optimization; Along the height direction, the reverse-optimized prefabricated model is sliced ​​into equal-height layers along the z-axis to obtain a series of two-dimensional contour information; Based on the two-dimensional contour information and scanning strategy, a corresponding printing scanning path for laser selective melting SLM is generated; Optionally, the layer thickness is 30-60 μm. The layer thickness range set in this invention can ensure vertical dimensional accuracy while also considering component surface quality and data processing efficiency. Contour data of the encapsulated region in each slice layer is extracted as the geometric basis for subsequent scanning path generation.

[0027] The scanning strategy is designed for slices containing a bezel region and employs a combination of contour offset scanning and internal filling scanning. Using a contour offset scanning method, the laser scans 1-2 circles along the inner and outer boundaries of the sheath contour to ensure the clarity and compactness of the contour and guarantee the airtightness of the sheath. The encapsulated solid area is internally filled by scanning with stripe scanning or checkerboard scanning. The scanning path direction is rotated 67° or 90° between adjacent layers to reduce anisotropy and internal stress.

[0028] Optionally, the laser spot diameter of the scanning path is 90-110μm, the scanning laser power is 200-350W, the scanning spacing is 0.08-0.12mm, and the scanning speed is 700-1200 mm / s.

[0029] Preferably, the reverse-optimized preform model is placed on the forming platform at a certain tilt angle.

[0030] The tilt angle refers to the angle between the model's main axis and the XY plane of the forming platform; The tilt angle is 30°-45°. This angle helps reduce the size of large-span overhanging structures, improves the feasibility of support removal, and also ensures high printing efficiency.

[0031] This invention tilts the model to avoid collapse during vertical printing, thus ensuring the overall forming quality.

[0032] Optionally, an external support structure design is adopted, whose main functions include: resisting deformation caused by molding thermal stress, ensuring the geometric accuracy of the casing, and providing necessary physical support for tilted models; The external support is a composite support structure that combines block support and linear support. The block support is used for the large area where the part contacts the substrate. Its internal structure is a grid structure with a unit size of 2mm×2mm to balance support strength and removability. The linear support is used to support the lower surface of the suspended structure and stress concentration areas such as external bosses and corners. The linear support has a support diameter of 0.8-1.2 mm and a support spacing of 3-5 mm.

[0033] Optionally, the material of the structural support structure and the sheath body is titanium alloy; Optionally, the thickness of the two-dimensional slice is 30-60 μm to ensure dimensional accuracy and surface finish in the vertical direction.

[0034] Step 3: Prepare spherical titanium alloy powder by electrode induction gas atomization (EIGA) or plasma rotating electrode atomization (PREP), and dry it in an environment of 80-100℃ under vacuum / inert gas for 6-8 hours to remove adsorbed water on the powder surface and prevent the titanium alloy powder from being oxidized in a high-temperature environment. Optionally, the powder particle size is 15μm-53μm, sphericity >95%, and bulk density ≥40%; The substrate is preheated by a resistance heating system integrated under or inside the substrate of the SLM equipment, and the preheating temperature is maintained between 80-200℃ through precise program control. The construction chamber is filled with inert gases such as high-purity argon as protective gases, maintaining an oxygen content of ≤500ppm to isolate oxygen / nitrogen and prevent oxidation / nitriding of titanium alloy during the printing process. The gas flow rate range is 10-30L / min, and the pressure in the construction chamber is maintained at a slightly positive pressure environment of 1010-1030mbar to ensure that external gases cannot penetrate into the construction chamber. Step 4: Perform powder compaction processing on each two-dimensional contour information to obtain the powder bed ready for printing; The laser selectively melts the powder in the powder bed prepared for printing according to the printing scanning path; Optionally, the laser-scanned area is precisely melted and shaped into a sealing housing for hot isostatic pressing.

[0035] During the layer-by-layer printing process, the metal powder that is not melted by the laser is naturally encapsulated inside the growing encapsulation cavity, thus achieving simultaneous encapsulation generation and powder filling in the same process. The laser parameters are as follows: spot diameter is 90-100μm, scanning laser power is 200-300W, scanning spacing is 0.08-0.12μm, and scanning speed is 1000-1200mm / s; This invention prints a prefabricated model layer by layer according to the slicing path setting and under appropriate process parameters. Before each layer of printing begins, a scraper reciprocates to spread metal powder, and the powder platform vibrates after each layer to ensure more complete powder loading. During printing, a laser scans and melts the metal powder bed along the path, and the dense outer shell of the layer-by-layer printing sleeve forms a cavity to contain the powder. The powder is retained inside the sleeve cavity during the layer-by-layer printing process, thus achieving simultaneous sleeve printing and powder loading. After the entire part is printed, the sleeve is sealed and the powder remains inside the sleeve, realizing the printing of the prefabricated model before HIP. Optionally, the specific steps of the powder spreading and compaction include: spreading metal powder using a scraper in reciprocating motion; after each powder spreading, starting the powder platform to vibrate so that the powder is filled more fully, with a vibration frequency of 30-90Hz; The powder coating thickness is 30-60 μm, and the relative density of the powder layer is 50%-60%; the number of reciprocating cycles is 2-3. Optionally, the layer-by-layer printing includes: the laser scanning the envelope area layer by layer along the path, the laser spot diameter being 90-100μm, the laser power being 200-300W, the scanning interval being 0.08-0.12μm, the scanning speed being 1000-1200mm / s, and the interlayer rotation angle being 67° or 90°.

[0036] During the printing process, the laser scanning part forms a dense outer shell of the casing, and the powder accumulates layer by layer inside the casing cavity. As the casing is sealed, the powder remains inside the casing, realizing the printing of pre-made models before HIP.

[0037] Step 5: Remove the external supports of the precast component, heat it, and simultaneously perform internal vacuuming. After vacuuming is completed, the casing is immediately sealed by welding. Optionally, after the required vacuum level is reached, a sealing operation should be performed immediately, and the delay time should not exceed 30 seconds, in order to avoid a decrease in vacuum level due to system leakage. Optionally, the laser power for sealing is 300-500 W, the welding speed is 5-15 mm / s, the spot diameter is 0.2-0.5 mm, the shielding gas is high-purity argon, and the gas flow rate is 10-15 L / min.

[0038] Preferably, the external support structure is removed and polished using a CNC machine tool or precision milling equipment; The vacuuming of the preform includes: placing the preform before HIP in a heating furnace, ensuring that the sheath is always upright, and heating it at a temperature of 350-400℃, so that the vacuum degree inside the sheath reaches below 10-3 Pa.

[0039] Step 6: Perform hot isostatic pressing (HIP) on the preform after sealing and welding to obtain the shaped part.

[0040] Preferably, the HIP treatment includes: placing the prefabricated component in the HIP equipment, heating and pressurizing it for 1.5-3 hours to bring the equipment temperature to 900-940℃ and the internal pressure to 100-150MPa, maintaining the temperature and pressure for 2-4 hours, and then cooling and depressurizing it for 1.5-3 hours. The post-processing includes: precision machining according to the dimensions of the target part.

[0041] This example includes the following steps: Step 1: Based on the structural characteristics of a certain TC4 titanium alloy spiral structure target part (such as...) Figure 2 (a) shows the design of a conventional casing (such as...). Figure 2 (b) and a prefabricated model of the component before HIP was created using CAD software; The model was meshed and finite element analysis was performed using MSC.Marc software. Based on the analysis results, the deformation, stress cloud diagram and density change curve of the model during the HIP process were obtained. Size compensation is performed based on the deformation and shrinkage of the casing. The model after the initial optimization is then subjected to finite element analysis again, and the above optimization steps are repeated to finally derive the final model after iterative optimization. Step 2: Place the reverse-optimized prefabricated model at a 45° tilt angle, and design a small number of structural supports at the external and internal corners of the model to prevent the parts from collapsing during the printing process; The 3D model is divided into 2D slices with a thickness of 50μm by performing layer cutting along the height direction. The scanning paths of each 2D slice are parallel and equally spaced. Step 3: Select Ti-6Al-4V powder as the raw material for SLM forming, wherein the powder with a particle size of less than 15μm accounts for 3%~5% by weight, the powder with a particle size of greater than 53μm accounts for no more than 10% by weight, and the remaining particle size ranges from 15 to 53μm; the flowability is ≤45s, and the loose packing density is 2.2~2.5g / cm3; the composition of Ti-6Al-4V powder is: Al: 5.5~6.75%, V: 3.5~4.5%, Fe: ≤0.3%, C: ≤0.08%, N: ≤0.05%, H: ≤0.012%, O: ≤0.13%, Ti: balance; prepare spherical titanium alloy powder using the rotating electrode method and dry it at 80-100℃ for 6-8h; preheat the substrate of the SLM equipment to 200℃ and fill the construction chamber with argon gas to reduce the oxygen content; Step 4: Following the scan path settings in Step 2, print the prefabricated model before HIP layer by layer; before starting the printing of each layer (e.g., Figure 3 As shown, a scraper reciprocates to spread the metal powder, and the powder platform vibrates at a frequency of 50Hz after each spreading operation to ensure more thorough powder loading. This spreading operation is repeated 2-3 times. During printing, a laser scans and melts the metal powder bed along a predetermined path. The laser spot diameter is 90μm, the laser power is 300W, the scanning interval is 0.08μm, the scanning speed is 1100mm / s, and the interlayer rotation angle is 67° or 90°. During printing, the dense outer shell of the sheath forms a cavity to contain the powder, which is trapped inside the cavity and accumulates layer by layer (e.g., ...). Figure 3 As shown in the figure, this allows for rapid powder loading while the sleeve is being printed. After the entire part is printed, the sleeve is sealed, and the powder remains inside the sleeve, thus achieving pre-fabricated model printing before HIP. Step 5: Remove the external support from the printed HIP preform blank; then place the preform in a heating furnace and heat it to 400°C. Vacuum treatment is performed to make the vacuum degree inside the sleeve reach below 10-3 Pa, and the sleeve is sealed immediately after the vacuum is completed. Step 6: Place the pre-formed HIP component after sealing into the equipment for HIP treatment. The entire forming process lasts for 7 hours. The heating and pressurization stage lasts for 2 hours, with the equipment temperature rising to 920℃ and the pressure increasing to 120MPa. The heat preservation and pressure holding stage lasts for 3 hours, during which the internal metal powder is completely densified. The cooling and depressurization stage lasts for 2 hours, after which the part is completely cooled and removed. The formed part only requires a small amount of machining to obtain the target part.

[0042] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A rapid prototyping method for titanium alloys based on additive manufacturing casing, characterized in that, include: Step 1: Calculate the deformation shrinkage rate of the powder based on the dimensions of the target part, and design a conformal sleeve that matches the shape of the target part; A prefabricated model of HIP (High-Intensity Integrated Circuit) is established using CAD software, including a powder model and a conformal encapsulation model, wherein the powder model and the conformal encapsulation model form an encapsulation structure; The prefabricated model before HIP is meshed and inversely optimized to obtain the inversely optimized prefabricated model. Numerical simulations were performed using MSC.marc software to obtain simulation parameters for the hot isostatic pressing process. Step 2: Design the placement angle and structural support of the prefabricated model after reverse optimization; Along the height direction, the reverse-optimized prefabricated model is sliced ​​into equal-height layers along the z-axis to obtain a series of two-dimensional contour information; Based on the two-dimensional contour information and scanning strategy, a corresponding printing scanning path for laser selective melting SLM is generated; Step 3: Prepare spherical titanium alloy powder and dry it; Step 4: Perform powder compaction treatment on each two-dimensional slice to obtain the powder bed ready for printing; The laser selectively melts the powder in the powder bed to be printed according to a preset scanning path; Step 5: Remove the external supports of the precast component, heat it, and simultaneously perform internal vacuuming. After vacuuming is completed, the casing is immediately sealed by welding. Step 6: Perform hot isostatic pressing (HIP) on the preform after sealing and welding to obtain the shaped part.

2. The rapid prototyping method for titanium alloys based on additive manufacturing casing according to claim 1, characterized in that, The simulation parameters include relative density, stress, and strain.

3. The rapid prototyping method for titanium alloys based on additive manufacturing casing according to claim 1, characterized in that, The reverse-optimized preform model includes an outer shell and an internal powder cavity.

4. The rapid prototyping method for titanium alloys based on additive manufacturing casing according to claim 1, characterized in that, The scanning strategy is designed for slices containing a bezel region and employs a combination of contour offset scanning and internal filling scanning. Using a contour offset scanning method, the laser scans 1-2 circles along the inner and outer boundaries of the casing contour to ensure the clarity and compactness of the contour and guarantee the airtightness of the casing. The encapsulated solid area is internally filled by scanning with stripe scanning or checkerboard scanning. The scanning path direction is rotated 67° or 90° between adjacent layers to reduce anisotropy and internal stress.

5. The rapid prototyping method for titanium alloys based on additive manufacturing casing according to claim 1, characterized in that, The laser spot diameter of the scanning path is 90-110μm, the scanning laser power is 200-350W, the scanning spacing is 0.08-0.12mm, and the scanning speed is 700-1200 mm / s.

6. The rapid prototyping method for titanium alloys based on additive manufacturing casing according to claim 1, characterized in that, The reverse-optimized prefabricated model is placed on the forming platform at a certain tilt angle; The tilt angle refers to the angle between the model's main axis and the XY plane of the forming platform.

7. The rapid prototyping method for titanium alloys based on additive manufacturing casing according to claim 1, characterized in that, The external support structure design has the following main functions: resisting deformation caused by molding thermal stress, ensuring the geometric accuracy of the casing, and providing necessary physical support for the tilted model. The external support is a composite support structure that combines block support and linear support.

8. The rapid prototyping method for titanium alloys based on additive manufacturing casing according to claim 1, characterized in that, The powder has a particle size of 15μm-53μm, a sphericity of >95%, and a bulk density of ≥40%.

9. The rapid prototyping method for titanium alloys based on additive manufacturing casing according to claim 1, characterized in that, The HIP process includes: placing the prefabricated component in the HIP equipment and heating and pressurizing it for 1.5-3 hours to bring the equipment temperature to 900-940℃.

10. The rapid prototyping method for titanium alloys based on additive manufacturing casing according to claim 9, characterized in that, Also includes: The internal pressure is increased to 100-150MPa, and the temperature and pressure are maintained for 2-4 hours, followed by a cooling and depressurization process for 1.5-3 hours.

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