Alloy powder for additive manufacturing and method of making same, alloy part

Abstract

This disclosure provides alloy powder for additive manufacturing, its preparation method, and alloy parts; the preparation method includes: mixing an initial raw material powder with reinforcing nanoparticles in a set proportion to obtain a mixed raw material powder; placing the mixed raw material powder in a sleeve and obtaining an alloy rod to be melted by hot isostatic pressing; performing induction melting on the alloy rod to be melted to obtain a raw material melt; and performing gas atomization treatment on the raw material melt to prepare alloy powder.

Description

Technical Field

[0001] This disclosure relates to the field of additive manufacturing technology, and in particular to alloy powders for additive manufacturing, methods for preparing the same, and alloy parts. Background Technology

[0002] Additive manufacturing, also known as 3D printing, is a technology that manufactures solid parts by depositing materials layer by layer based on three-dimensional model data. This technology can produce parts with complex shapes and structures and offers advantages such as mass production, short production cycles, and high precision of the formed products. One of the core aspects of additive manufacturing technology is the alloy powder used, whose properties directly affect the quality and performance of the final additively manufactured alloy parts.

[0003] However, alloy powders prepared using current methods in related technologies often result in alloy parts with insufficient strength when manufactured using additive manufacturing techniques, limiting their applications. Therefore, there is an urgent need to provide a method for preparing alloy powders that can be used to manufacture high-strength alloy parts. Summary of the Invention

[0004] This disclosure provides alloy powder for additive manufacturing, a method for preparing the same, and alloy parts; it enables the preparation of alloy powder for additive manufacturing to produce high-strength alloy parts.

[0005] The technical solution disclosed herein is implemented as follows: In a first aspect, this disclosure provides a method for preparing alloy powder for additive manufacturing, the method comprising: The initial raw material powder and the reinforcing nanoparticles are mixed in a set ratio to obtain the mixed raw material powder. The mixed raw material powder is placed in a sleeve and the alloy rod to be melted is obtained by hot isostatic pressing. The alloy rod to be melted is subjected to induction melting to obtain raw material molten liquid; The raw material molten liquid is subjected to gas atomization treatment to prepare alloy powder.

[0006] In some possible implementations, the reinforcing nanoparticles include one or more of nanocarbide particles, nanoboride particles, nanooxide particles, and nanonitride particles.

[0007] In some possible implementations, the reinforcing nanoparticles include nano-TiC particles and / or nano-TiB2 particles.

[0008] In some possible implementations, the preparation method includes: The mixed raw material powder is obtained by mixing titanium powder, aluminum powder, vanadium powder and nano TiC particles in a set ratio. The mixed raw material powder is placed in the package, and the alloy rod to be melted is obtained by the hot isostatic pressing method; The alloy rod to be melted is subjected to induction melting to obtain raw material molten liquid; The raw material molten liquid is subjected to gas atomization treatment to prepare titanium alloy powder; The titanium alloy powder, by mass percentage, comprises: Al: 5.5 wt.% to 6.75 wt.%; V: 3.5 wt.% to 4.5 wt.%; C: 0.05 wt.% to 0.15 wt.%; Fe: ≤0.30 wt.%; O: ≤0.20 wt.%; N: ≤0.05 wt.%; H: ≤0.015 wt.%; the remainder being Ti.

[0009] In some possible implementations, the hot isostatic pressing method corresponds to a process temperature greater than or equal to 900°C and less than or equal to 950°C, a pressure greater than or equal to 120MPa and less than or equal to 150MPa, a holding time greater than or equal to 1h and less than or equal to 5h, and is cooled with the furnace.

[0010] In some possible implementations, the hot isostatic pressing method corresponds to a process temperature greater than or equal to 400°C and less than or equal to 500°C, a pressure greater than or equal to 120MPa and less than or equal to 150MPa, a holding time greater than or equal to 1h and less than or equal to 5h, and is cooled with the furnace.

[0011] In some possible implementations, the hot isostatic pressing process corresponds to a process temperature greater than or equal to 1100°C and less than or equal to 1200°C, a pressure greater than or equal to 120MPa and less than or equal to 150MPa, a holding time greater than or equal to 1h and less than or equal to 5h, and is cooled with the furnace.

[0012] In some possible implementations, the diameter of the alloy bar to be melted is greater than or equal to 50 mm and less than or equal to 70 mm, and the length of the alloy bar to be melted is greater than or equal to 600 mm and less than or equal to 800 mm.

[0013] In some possible implementations, during the induction melting, the heating power is in the range of 10kW to 80kW, and the feed rate of the alloy bar to be melted is in the range of 0.2mm / s to 3.0mm / s.

[0014] In some possible embodiments, the preparation method further includes: performing particle size sieving on the prepared alloy powder.

[0015] In a second aspect, this disclosure provides an alloy powder for additive manufacturing, which is prepared according to the method for preparing alloy powder for additive manufacturing described in the first aspect.

[0016] In some possible implementations, the particle size of the alloy powder is greater than or equal to 15 μm and less than or equal to 53 μm, or the particle size of the alloy powder is greater than or equal to 75 μm and less than or equal to 180 μm.

[0017] In some possible implementations, the sphericity of the alloy powder is greater than or equal to 0.9, and the hollow powder ratio of the alloy powder is less than or equal to 0.3%.

[0018] Thirdly, this disclosure provides an alloy part, which is obtained by additive manufacturing based on the alloy powder for additive manufacturing described in the second aspect.

[0019] This disclosure provides alloy powder for additive manufacturing, a method for preparing the same, and alloy parts. The method involves mixing initial raw material powder with reinforcing nanoparticles in a predetermined ratio to obtain a mixed raw material powder. This mixed raw material powder is then placed in a casing, and an alloy rod to be melted is obtained through hot isostatic pressing. Finally, after induction melting of the alloy rod to be melted to obtain a raw material molten liquid, the alloy powder is prepared through gas atomization. This disclosure allows for the thorough and uniform mixing of reinforcing nanoparticles into the initial raw material powder, avoiding the growth and agglomeration of the reinforcing nanoparticles, thus enabling the acquisition of high-strength alloy parts by adding reinforcing nanoparticles. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of a method for preparing alloy powder for additive manufacturing provided in this disclosure.

[0021] Figure 2 This is a schematic diagram of another method for preparing alloy powder for additive manufacturing provided in this disclosure.

[0022] Figure 3 Metallographic diagram of the deposited titanium alloy part provided in Embodiment 1 of this disclosure.

[0023] Figure 4 The metallographic structure of the heat-treated titanium alloy part provided in Embodiment 1 of this disclosure is shown.

[0024] Figure 5 Metallographic diagram of the deposited titanium alloy part provided in Embodiment 2 of this disclosure.

[0025] Figure 6 This is a metallographic diagram of a heat-treated titanium alloy part provided in Embodiment 2 of this disclosure.

[0026] Figure 7 This is a surface morphology diagram of the titanium alloy powder provided in Embodiment 3 of this disclosure.

[0027] Figure 8 This is a cross-sectional morphology diagram of the titanium alloy powder provided in Embodiment 3 of this disclosure.

[0028] Figure 9 Metallographic diagram of the deposited titanium alloy part provided in Embodiment 3 of this disclosure.

[0029] Figure 10 This is a metallographic diagram of a heat-treated titanium alloy part provided in Embodiment 3 of this disclosure.

[0030] Figure 11 Metallographic diagram of the deposited titanium alloy part provided in Embodiment 4 of this disclosure.

[0031] Figure 12 This is a metallographic diagram of a heat-treated titanium alloy part provided in Embodiment 4 of this disclosure.

[0032] Figure 13 Metallographic diagram of a deposited titanium alloy part provided as Comparative Example 1 of this disclosure.

[0033] Figure 14 Metallographic diagram of a heat-treated titanium alloy part provided as Comparative Example 1 of this disclosure.

[0034] Figure 15 Metallographic diagram of a deposited titanium alloy part provided as Comparative Example 2 of this disclosure.

[0035] Figure 16 Metallographic diagram of a heat-treated titanium alloy part provided in Comparative Example 2 of this disclosure. Detailed Implementation

[0036] The technical solutions in this disclosure will now be clearly and completely described with reference to the accompanying drawings.

[0037] See Figure 1 The present disclosure illustrates a method for preparing alloy powder for additive manufacturing, which includes the following steps.

[0038] In step S101, the initial raw material powder and the reinforcing nanoparticles are mixed in a set ratio to obtain the mixed raw material powder.

[0039] In some examples, when mixing the initial raw material powder with the reinforcing nanoparticles, the initial raw material powder and the reinforcing nanoparticles can be placed in, for example, a mixer for mixing, so that the reinforcing nanoparticles can be uniformly dispersed in the initial raw material powder.

[0040] In step S102, the mixed raw material powder is placed in a sleeve and the alloy rod to be melted is obtained by hot isostatic pressing.

[0041] Understandably, once the alloy rod to be melted is obtained by hot isostatic pressing, the shroud can be removed to obtain the shaped alloy rod to be melted.

[0042] In related technologies, after the initial raw material powder is uniformly mixed and melted in a vacuum environment to obtain a molten alloy, reinforcing nanoparticles are then added to the molten alloy. However, this method of adding reinforcing nanoparticles to the initial raw material powder causes the reinforcing nanoparticles to grow during the melting and solidification process in the molten alloy, and they tend to float and sink in the molten alloy, resulting in the reinforcing nanoparticles not being completely and uniformly mixed into the initial raw material powder.

[0043] In this disclosure, firstly, in step S101, the initial raw material powder and reinforcing nanoparticles are uniformly mixed. Then, in step S102, the mixed raw material powder is formed into corresponding alloy rods to be smelted using hot isostatic pressing (HIP). It is understood that in the specific implementation process, HIP uses high-pressure gas as a medium to apply isostatic pressure to the mixed raw material powder, thereby causing the mixed raw material powder to undergo a powder metallurgy process. Therefore, in the process of preparing the alloy rods to be smelted in this disclosure, the phenomenon of agglomeration and loss of reinforcing nanoparticles in the initial raw material powder, as seen in related technologies, is avoided, allowing the reinforcing nanoparticles to be uniformly mixed into the initial raw material powder.

[0044] In step S103, the alloy bar to be melted is subjected to induction melting to obtain raw material melt.

[0045] Understandably, in this disclosure, the alloy rod to be melted obtained in step S102 needs to be subjected to electrode induction melting to prepare the raw material melt for alloy powder. Understandably, during the induction melting of the alloy rod to be melted and the formation of the raw material melt, secondary mixing of the reinforcing nanoparticles in the initial raw material powder is involved to ensure that they can be more uniformly dispersed in the initial raw material powder. This method can improve the uniformity of the prepared alloy powder.

[0046] In step S104, the raw material melt is subjected to gas atomization treatment to prepare alloy powder.

[0047] In some examples, the induction melting and gas atomization of the alloy rod to be melted can be performed in an Electrode Induction Melting Gas Atomization (EIGA) apparatus. It is understood that after the alloy rod to be melted, prepared in step S102, is loaded into the EIGA apparatus, it is heated using an induction coil to melt the rod. The resulting alloy droplets are then forcibly broken up and cooled as they pass through a high-pressure inert gas nozzle in the EIGA apparatus, thereby forming the alloy powder.

[0048] It is understandable that adding reinforcing nanoparticles to the initial raw material powder to prepare alloy powder for additive manufacturing is primarily because, during the additive manufacturing of alloy parts, the reinforcing nanoparticles disperse and precipitate at the grain boundaries of the matrix, thereby promoting the nucleation process and increasing the nucleation rate. Simultaneously, they inhibit grain growth, fundamentally refining the alloy grains and significantly improving the alloy strength without compromising its plasticity. Furthermore, based on the prepared alloy powder, the rapid melting and solidification processes during additive manufacturing allow the reinforcing nanoparticles in the powder to be fully melted, while also preventing their growth and agglomeration. This results in finely dispersed reinforcing nanoparticles distributed in a network structure at the grain boundaries of the alloy parts, thus improving both the strength and plasticity of the alloy parts.

[0049] The technical solution provided in this disclosure involves mixing initial raw material powder with reinforcing nanoparticles in a predetermined ratio to obtain a mixed raw material powder. This mixed raw material powder is then placed in a sleeve to obtain an alloy rod to be melted via hot isostatic pressing. Finally, after induction melting of the alloy rod to be melted to obtain a raw material molten liquid, alloy powder can be prepared through gas atomization. This disclosure allows for the thorough and uniform mixing of reinforcing nanoparticles into the initial raw material powder, avoiding the growth and agglomeration of the reinforcing nanoparticles, thus enabling the acquisition of high-strength alloy parts by adding reinforcing nanoparticles.

[0050] for Figure 1 In some possible implementations of the technical solutions shown, the enhanced nanoparticles include one or more of nanocarbide particles, nanoboride particles, nanooxide particles, and nanonitride particles.

[0051] Understandably, reinforcing nanoparticles can refine the grain size of the matrix material, thereby improving its fracture toughness and reducing the likelihood of brittle fracture. Nanoparticles of carbides, borates, oxides, and nitrides, due to their high hardness and strength, can effectively improve the wear resistance, strength, and hardness of the matrix material. For example, nanoparticles of oxides possess good chemical stability and hardness, nanoparticles of carbides exhibit high strength and wear resistance, and nanoparticles of nitrides exhibit high thermal conductivity.

[0052] In some examples of the above-described embodiments, the reinforcing nanoparticles include nano-TiC particles and / or nano-TiB2 particles.

[0053] When the reinforcing nanoparticles are nano-TiC particles and / or nano-TiB2 particles, they can improve the strength of the matrix by hindering dislocation movement in the matrix material, refining the matrix grains, and promoting dislocation multiplication. For example, when nano-TiC particles and nano-TiB2 particles are used as reinforcing phases in Al-Si series alloy powders, they act as nucleation points, promoting grain nucleation in aluminum alloys, thereby refining the microstructure of the aluminum alloy and improving the strength and plasticity of aluminum alloy parts.

[0054] for Figure 1 In some possible embodiments of the technical solution shown, the preparation method includes: The raw material powder is obtained by mixing titanium powder, aluminum powder, vanadium powder and nano TiC particles in a set ratio. The mixed raw material powder is placed in a sleeve and the alloy rod to be melted is obtained by hot isostatic pressing. The alloy bars to be melted are induction melted to obtain the raw material molten liquid; Titanium alloy powder is prepared by gas atomization of the raw material molten liquid; The titanium alloy powder, by mass percentage, comprises: Al: ≥5.5 wt.% and ≤6.75 ​​wt.%; V: ≥3.5 wt.% and ≤4.5 wt.%; C: ≥0.05 wt.% and ≤0.15 wt.%; Fe: ≤0.30 wt.%; O: ≤0.20 wt.%; N: ≤0.05 wt.%; H: ≤0.015 wt.%; with the remainder being Ti.

[0055] In the specific process of preparing titanium alloy powder, titanium powder, aluminum powder, vanadium powder and nano TiC particles in a set ratio can be mixed to obtain mixed raw material powder, which can then be used to obtain the corresponding alloy rod to be melted by hot isostatic pressing. Finally, titanium alloy powder can be prepared using an EIGA device.

[0056] Understandably, when nano-TiC particles are used as a reinforcing phase in titanium alloys, they can inhibit grain growth in the titanium matrix and promote recrystallization nucleation, thereby helping to improve the mechanical properties of the material, such as strength and hardness. Furthermore, when nano-TiC particles are used as a reinforcing phase in titanium alloys, the carbon element also enables the titanium alloy to exhibit good isotropy.

[0057] for Figure 1 In some possible implementations of the technical solution shown, the hot isostatic pressing method corresponds to a process temperature greater than or equal to 900°C and less than or equal to 950°C, a pressure greater than or equal to 120MPa and less than or equal to 150MPa, a heat preservation and pressure holding time greater than or equal to 1h and less than or equal to 5h, and cooling with the furnace.

[0058] In the preparation of titanium alloys, the hot isostatic pressing process is carried out at a high temperature in the range of 900°C to 950°C and a high pressure in the range of 120 MPa to 150 MPa.

[0059] for Figure 1 In some possible implementations of the technical solution shown, the hot isostatic pressing method corresponds to a process temperature greater than or equal to 400°C and less than or equal to 500°C, a pressure greater than or equal to 120MPa and less than or equal to 150MPa, a heat preservation and pressure holding time greater than or equal to 1h and less than or equal to 5h, and is cooled with the furnace.

[0060] In the preparation of aluminum alloys, the hot isostatic pressing process is carried out at a high temperature in the range of 400°C to 500°C and a high pressure in the range of 120MPa to 150MPa.

[0061] for Figure 1 In some possible implementations of the technical solution shown, the hot isostatic pressing method corresponds to a process temperature greater than or equal to 1100℃ and less than or equal to 1200℃, a pressure greater than or equal to 120MPa and less than or equal to 150MPa, a heat preservation and pressure holding time greater than or equal to 1h and less than or equal to 5h, and is cooled with the furnace.

[0062] In the preparation of high-temperature alloys, the hot isostatic pressing process is carried out at high temperatures ranging from 1100°C to 1200°C and high pressures ranging from 120 MPa to 150 MPa.

[0063] Understandably, the combined effects of high temperature and high pressure effectively eliminate porosity within the alloy material, thereby improving its density. Furthermore, the bar stock obtained through hot isostatic pressing optimizes the microstructure of the alloy, resulting in more uniform and finer grains, reducing adverse changes such as secondary crystallization and high-temperature decomposition, thus improving the overall performance of the alloy. Consequently, due to the improved density and microstructure, the hot isostatically pressed alloy exhibits higher mechanical properties, such as strength and hardness.

[0064] for Figure 1 In some possible implementations of the technical solution shown, the casing is made of stainless steel.

[0065] During hot isostatic pressing (HIP), the cladding protects the raw material powder from external environmental contamination, ensuring its purity under the high temperature and pressure of sintering. Furthermore, the vacuum seal of the cladding removes air and water, preventing oxidation and hindering the sintering process, thus preserving the powder's properties. In addition, the cladding effectively inhibits deformation and shrinkage of the bars to be melted during HIP.

[0066] It should be noted that, in practice, the material of the sheath is not limited to stainless steel. For example, when preparing the titanium alloy powder mentioned above, the sheath can also be made of titanium alloy.

[0067] for Figure 1 In some possible implementations of the technical solution shown, the diameter of the alloy bar to be melted is greater than or equal to 50 mm and less than or equal to 70 mm, and the length of the alloy bar to be melted is greater than or equal to 600 mm and less than or equal to 800 mm.

[0068] The diameter and length of the alloy rod to be melted affect the size of the resulting molten alloy droplets, which in turn influences the particle size distribution of the subsequent alloy powder. Understandably, a larger diameter may lead to the formation of larger alloy droplets. On the other hand, the size of the alloy rod to be melted also affects the heating power and melting efficiency of induction melting. For example, a larger alloy rod may require more heat to melt, which will affect the efficiency of induction melting.

[0069] Furthermore, in the EIGA process, the EIGA device is a crucibleless melting system, meaning that the alloy bar to be melted extends into the induction coil during induction melting. Therefore, by controlling the diameter of the alloy bar to be melted, conductive arcing between it and the induction coil can be prevented. Moreover, controlling the size of the alloy bar to be melted allows for increased heating power during induction melting, improving the yield of fine powder and significantly reducing the proportion of slag.

[0070] for Figure 1 In some possible implementations of the technical solution shown, the heating power is in the range of 10kW to 80kW during induction melting, and the feed speed of the alloy bar to be melted is in the range of 0.2mm / s to 3.0mm / s.

[0071] In this disclosure, by controlling the heating power during induction melting, the alloy rod to be melted can be rapidly and uniformly melted, avoiding problems such as local overheating or insufficient melting, thereby improving melting efficiency and quality. In practical implementation, the appropriate combination of heating power and feed rate can precisely control the formation and atomization process of alloy droplets, resulting in a more uniform powder particle size distribution and better sphericity. More importantly, at an appropriate feed rate, the alloy droplets can achieve rapid solidification during atomization, resulting in a uniform microstructure with no or minimal segregation. This helps to increase the cooling rate of the alloy powder, thereby obtaining finer and more uniform alloy powder particles.

[0072] for Figure 1 The technical solution shown, in some possible implementations, such as Figure 2 As shown, the preparation method further includes step S105.

[0073] In step S105, the prepared alloy powder is subjected to particle size sieving.

[0074] Understandably, the particle size of alloy powder has a significant impact on the additive manufacturing process. For example, smaller particle sizes result in larger specific surface areas, increasing the sintering driving force during additive manufacturing and facilitating the sintering process. Furthermore, fine alloy powder particles can fill the voids in coarse particles, increasing the packing density and improving the strength and surface quality of the additively manufactured alloy parts. Conversely, if the selected powder has a large particle size and a wide range, stratification is likely to occur during powder spreading, and the alloy powder is prone to uneven melting or incomplete melting upon heating, leading to increased porosity and surface roughness in the formed alloy parts. Therefore, this disclosure also requires particle size sieving of the alloy powder obtained from gas atomization to suit the additive manufacturing process.

[0075] In addition, this disclosure also provides an alloy powder for additive manufacturing, which is prepared according to the preparation method of the alloy powder for additive manufacturing described in the foregoing technical solution.

[0076] In some possible implementations, the particle size of the alloy powder is greater than or equal to 15 μm and less than or equal to 53 μm, or the particle size of the alloy powder is greater than or equal to 75 μm and less than or equal to 180 μm.

[0077] In additive manufacturing, the particle size of alloy powder has a significant impact on powder flowability. Generally speaking, smaller particle size alloy powder can improve powder flowability, but excessively fine alloy powder may attract each other due to electrostatic effects, reducing flowability.

[0078] For additive manufacturing technologies employing powder spreading processes, smaller particle sizes of alloy powders (e.g., 15 μm to 53 μm) facilitate uniform spreading during the process. Furthermore, smaller particle sizes provide a larger surface area, thereby improving laser energy absorption efficiency and contributing to better melting and solidification uniformity. For additive manufacturing technologies employing powder feeding processes, a wider range of alloy powder particle sizes is permitted, such as 75 μm to 180 μm.

[0079] In some possible implementations, the sphericity of the alloy powder is greater than or equal to 0.9, and the hollow powder ratio of the alloy powder is less than or equal to 0.3%.

[0080] On the one hand, high sphericity alloy powder is beneficial for powder spreading and feeding in additive manufacturing. This is because spherical alloy powder particles have better flowability than irregular or angular alloy powders, preventing the agglomeration of reinforcing nanoparticles during powder spreading and feeding. On the other hand, fewer hollow alloy powder particles can reduce the formation of localized porosity defects. Moreover, hollow alloy powder may not completely melt during the melting process, leading to porosity in the formed alloy parts and affecting their strength and reliability.

[0081] Finally, this disclosure provides an alloy part, which is obtained by additive manufacturing using alloy powder for additive manufacturing as described in the foregoing technical solution.

[0082] The technical solution provided in this disclosure enables the reinforcing nanoparticles to be uniformly distributed in the initial raw material powder, thus preventing uneven distribution and agglomeration of the reinforcing nanoparticles in the prepared additive manufacturing alloy powder. This achieves the goal of improving the tensile mechanical properties of the alloy parts obtained through additive manufacturing. Taking the titanium alloy powder obtained by the aforementioned solution as an example, after manufacturing the corresponding titanium alloy parts using the Selective Laser Melting (SLM) method and undergoing heat treatment, the tensile strength of the titanium alloy parts is greater than or equal to 1030 MPa, the yield strength is greater than or equal to 945 MPa, the elongation is greater than or equal to 15%, and the reduction of area is greater than or equal to 40%.

[0083] The technical solution of this disclosure will be described in detail below through specific embodiments.

[0084] Example 1: Step S1: Mix titanium powder, aluminum powder, vanadium powder and nano TiC particles in a set ratio to obtain the mixed raw material powder.

[0085] Step S2: The mixed raw material powder is placed in a stainless steel sleeve and the alloy bar to be melted is obtained by hot isostatic pressing; wherein the hot isostatic pressing process temperature is 950℃, the pressure is 120MPa, the holding time is 3h and the furnace is cooled.

[0086] Step S3: Induction melting is performed on the alloy bar to be melted to obtain raw material molten liquid; wherein, during induction melting, the heating power is 20kW and the feed speed of the alloy bar to be melted is 0.2mm / s.

[0087] Step S4: The raw material melt is subjected to gas atomization treatment to prepare titanium alloy powder; wherein, by mass percentage, the titanium alloy powder comprises: Al: 5.5 wt.%; V: 3.5 wt.%; C: 0.05 wt.%; Fe: 0.30 wt.%; O: 0.20 wt.%; N: 0.02 wt.%; H: 0.015 wt.%; the remainder is Ti.

[0088] Step S5: Perform particle size sieving on the titanium alloy powder obtained in step S4; wherein, the particle size of the titanium alloy powder after particle size sieving is in the range of 15μm to 53μm, and the sphericity of the titanium alloy powder is greater than or equal to 0.9, and the hollow powder rate is less than or equal to 0.3%.

[0089] Step S6: A deposited titanium alloy part is prepared using selective laser melting (SLM) technology, and then subjected to heat treatment. The heat treatment temperature is 800℃, the holding time is 4 hours, and the part is cooled to room temperature under an argon protective gas atmosphere. See [link / reference]. Figure 3 and Figure 4 The diagrams show the metallographic structures of the deposited and heat-treated titanium alloy parts, respectively. Table 1 shows the tensile mechanical properties of the deposited and heat-treated titanium alloy parts, respectively.

[0090]

[0091] Table 1 It should be noted that the forming direction H mentioned above refers to the direction parallel to the substrate in the forming chamber of the selective laser melting equipment, and the forming direction S mentioned above refers to the direction perpendicular to the substrate.

[0092] Example 2: Step S1: Mix titanium powder, aluminum powder, vanadium powder and nano TiC particles in a set ratio to obtain the mixed raw material powder.

[0093] Step S2: The mixed raw material powder is placed in a stainless steel sleeve and the alloy bar to be melted is obtained by hot isostatic pressing; wherein the hot isostatic pressing process temperature is 900℃, the pressure is 150MPa, the holding time is 3h and the furnace is cooled.

[0094] Step S3: Induction melting is performed on the alloy bar to be melted to obtain raw material molten liquid; wherein, during induction melting, the heating power is 35kW and the feed speed of the alloy bar to be melted is 0.35mm / s.

[0095] Step S4: The raw material melt is subjected to gas atomization treatment to prepare titanium alloy powder; wherein, by mass percentage, the titanium alloy powder comprises: Al: 5.7 wt.%; V: 4.0 wt.%; C: 0.08 wt.%; Fe: 0.20 wt.%; O: 0.15 wt.%; N: 0.03 wt.%; H: 0.012 wt.%; the remainder is Ti.

[0096] Step S5: Perform particle size sieving on the titanium alloy powder obtained in step S4; wherein, the particle size of the titanium alloy powder after particle size sieving is in the range of 15μm to 53μm, and the sphericity of the titanium alloy powder is 0.93, and the hollow powder rate is 0.28%.

[0097] Step S6: A deposited titanium alloy part is prepared using selective laser melting (SLM) technology, and then subjected to heat treatment. The heat treatment temperature is 800℃, the holding time is 4 hours, and the part is cooled to room temperature under an argon protective gas atmosphere. See [link / reference]. Figure 5 and Figure 6The diagrams show the metallographic structures of the deposited and heat-treated titanium alloy parts, respectively. Table 2 shows the tensile mechanical properties of the deposited and heat-treated titanium alloy parts, respectively.

[0098]

[0099] Table 2 Example 3: Step S1: Mix titanium powder, aluminum powder, vanadium powder and nano TiC particles in a set ratio to obtain the mixed raw material powder.

[0100] Step S2: The mixed raw material powder is placed in a stainless steel sleeve and the alloy bar to be melted is obtained by hot isostatic pressing; wherein the hot isostatic pressing process temperature is 920℃, the pressure is 140MPa, the holding time is 3h and the furnace is cooled.

[0101] Step S3: Induction melting is performed on the alloy bar to be melted to obtain raw material molten liquid; wherein, during induction melting, the heating power is 45kW and the feed speed of the alloy bar to be melted is 1.0mm / s.

[0102] Step S4: The raw material melt is subjected to gas atomization treatment to prepare titanium alloy powder; wherein, by mass percentage, the titanium alloy powder comprises: Al: 6.75 wt.%; V: 4.5 wt.%; C: 0.10 wt.%; Fe: 0.15 wt.%; O: 0.10 wt.%; N: 0.015 wt.%; H: 0.01 wt.%; the remainder is Ti.

[0103] Step S5: The titanium alloy powder obtained in step S4 is subjected to particle size sieving; wherein, the particle size of the titanium alloy powder after particle size sieving is in the range of 15μm to 53μm, and the sphericity of the titanium alloy powder is 0.95, and the hollow powder rate is 0.25%. (See also...) Figure 7 and Figure 8 The images show the surface morphology and cross-sectional morphology of the titanium alloy powder, respectively.

[0104] Step S6: A deposited titanium alloy part is prepared using selective laser melting (SLM) technology, and then subjected to heat treatment. The heat treatment temperature is 800℃, the holding time is 4 hours, and the part is cooled to room temperature under an argon protective gas atmosphere. See [link / reference]. Figure 9 and Figure 10 The diagrams show the metallographic structures of the deposited and heat-treated titanium alloy parts, respectively. Table 3 shows the tensile mechanical properties of the deposited and heat-treated titanium alloy parts, respectively.

[0105]

[0106] Table 3 Example 4: Step S1: Mix titanium powder, aluminum powder, vanadium powder and nano TiC particles in a set ratio to obtain the mixed raw material powder.

[0107] Step S2: The mixed raw material powder is placed in a stainless steel sleeve and the alloy bar to be melted is obtained by hot isostatic pressing; wherein the hot isostatic pressing process temperature is 920℃, the pressure is 150MPa, the holding time is 3h and the furnace is cooled.

[0108] Step S3: Induction melting is performed on the alloy bar to be melted to obtain raw material molten liquid; wherein, during induction melting, the heating power is 55kW and the feed speed of the alloy bar to be melted is 3.0mm / s.

[0109] Step S4: The raw material molten liquid is subjected to gas atomization treatment to prepare titanium alloy powder; wherein, by mass percentage, the titanium alloy powder comprises: Al: 6.70 wt.%; V: 4.31 wt.%; C: 0.12 wt.%; Fe: 0.14 wt.%; O: 0.10 wt.%; N: 0.015 wt.%; H: 0.01 wt.%; the remainder is Ti.

[0110] Step S5: Perform particle size sieving on the titanium alloy powder obtained in step S4; wherein, the particle size of the titanium alloy powder after particle size sieving is in the range of 15μm to 53μm, and the sphericity of the titanium alloy powder is 0.95, and the hollow powder rate is 0.25%.

[0111] Step S6: A deposited titanium alloy part is prepared using selective laser melting (SLM) technology, and then subjected to heat treatment. The heat treatment temperature is 800℃, the holding time is 4 hours, and the part is cooled to room temperature under an argon protective gas atmosphere. See [link / reference]. Figure 11 and Figure 12 The diagrams show the metallographic structures of the deposited and heat-treated titanium alloy parts, respectively. Table 4 shows the tensile mechanical properties of the deposited and heat-treated titanium alloy parts, respectively.

[0112]

[0113] Table 4 Example 5: Step S1: Mix titanium powder, aluminum powder, vanadium powder and nano TiC particles in a set ratio to obtain the mixed raw material powder.

[0114] Step S2: The mixed raw material powder is placed in a stainless steel sleeve and the alloy bar to be melted is obtained by hot isostatic pressing; wherein the hot isostatic pressing process temperature is 920℃, the pressure is 150MPa, the holding time is 3h and the furnace is cooled.

[0115] Step S3: Induction melting is performed on the alloy bar to be melted to obtain raw material molten liquid; wherein, during induction melting, the heating power is 45kW and the feed speed of the alloy bar to be melted is 1.0mm / s.

[0116] Step S4: The raw material melt is subjected to gas atomization treatment to prepare titanium alloy powder; wherein, by mass percentage, the titanium alloy powder comprises: Al: 6.70 wt.%; V: 4.31 wt.%; C: 0.15 wt.%; Fe: 0.14 wt.%; O: 0.10 wt.%; N: 0.015 wt.%; H: 0.01 wt.%; the remainder is Ti.

[0117] Step S5: Perform particle size sieving on the titanium alloy powder obtained in step S4; wherein, the particle size of the titanium alloy powder after particle size sieving is in the range of 15μm to 53μm, and the sphericity of the titanium alloy powder is 0.95, and the hollow powder rate is 0.25%.

[0118] Step S6: A deposited titanium alloy part is prepared using selective laser melting (SLM) technology, and then subjected to heat treatment. The heat treatment temperature is 800℃, the holding time is 4h, and the part is cooled to room temperature under argon protective gas. See Table 5, which shows the tensile mechanical properties of the deposited and heat-treated titanium alloy parts, respectively.

[0119]

[0120] Table 5 Example 6: Step S1: Mix titanium powder, aluminum powder, vanadium powder and nano TiB2 particles in a set ratio to obtain the mixed raw material powder.

[0121] Step S2: The mixed raw material powder is placed in a stainless steel sleeve and the alloy bar to be melted is obtained by hot isostatic pressing; wherein the hot isostatic pressing process temperature is 920℃, the pressure is 150MPa, the holding time is 3h and the furnace is cooled.

[0122] Step S3: Induction melting is performed on the alloy bar to be melted to obtain raw material molten liquid; wherein, during induction melting, the heating power is 45kW and the feed speed of the alloy bar to be melted is 1.0mm / s.

[0123] Step S4: The raw material melt is subjected to gas atomization treatment to prepare titanium alloy powder; wherein, by mass percentage, the titanium alloy powder comprises: Al: 6.70 wt.%; V: 4.31 wt.%; C: 0.01 wt.%; Fe: 0.14 wt.%; O: 0.10 wt.%; N: 0.15 wt.%; H: 0.01 wt.%; B: 0.02 wt.%; the remainder is Ti.

[0124] Step S5: Perform particle size sieving on the titanium alloy powder obtained in step S4; wherein, the particle size of the titanium alloy powder after particle size sieving is in the range of 15μm to 53μm, and the sphericity of the titanium alloy powder is 0.9, and the hollow powder rate is 0.25%.

[0125] Step S6: A deposited titanium alloy part is prepared using selective laser melting (SLM) technology, and then subjected to heat treatment. The heat treatment temperature is 800℃, the holding time is 4 hours, and the part is cooled to room temperature under argon protective gas. See Table 6, which shows the tensile mechanical properties of the deposited and heat-treated titanium alloy parts, respectively.

[0126]

[0127] Table 6 Example 7: Step S1: Mix titanium powder, aluminum powder, vanadium powder, nano TiC particles and nano TiB2 particles in a set ratio to obtain the mixed raw material powder.

[0128] Step S2: The mixed raw material powder is placed in a stainless steel sleeve and the alloy bar to be melted is obtained by hot isostatic pressing; wherein the hot isostatic pressing process temperature is 920℃, the pressure is 150MPa, the holding time is 3h and the furnace is cooled.

[0129] Step S3: Induction melting is performed on the alloy bar to be melted to obtain raw material molten liquid; wherein, during induction melting, the heating power is 55kW and the feed speed of the alloy bar to be melted is 2.5mm / s.

[0130] Step S4: The raw material melt is subjected to gas atomization treatment to prepare titanium alloy powder; wherein, by mass percentage, the titanium alloy powder comprises: Al: 6.65wt.%; V: 4.27wt.%; C: 0.05wt.%; Fe: 0.21wt.%; O: 0.15wt.%; N: 0.19wt.%; H: 0.015wt.%; B: 0.01wt.%; the remainder is Ti.

[0131] Step S5: Perform particle size sieving on the titanium alloy powder obtained in step S4; wherein, the particle size of the titanium alloy powder after particle size sieving is in the range of 15μm to 53μm, and the sphericity of the titanium alloy powder is 0.95, and the hollow powder rate is 0.25%.

[0132] Step S6: A deposited titanium alloy part is prepared using selective laser melting (SLM) technology, and then the deposited titanium alloy part is subjected to heat treatment. The heat treatment temperature is 800℃, the holding time is 4h, and then it is cooled to room temperature under argon protective gas.

[0133] Table 7 shows the tensile mechanical properties of titanium alloy parts in the deposited state and the heat-treated state, respectively.

[0134]

[0135] Table 7 Example 8: Step S1: Mix aluminum powder and nano TiC particles in a set ratio to obtain mixed raw material powder.

[0136] Step S2: The mixed raw material powder is placed in a stainless steel sleeve and the alloy bar to be melted is obtained by hot isostatic pressing; wherein the hot isostatic pressing process temperature is 400℃, the pressure is 120MPa, the holding time is 1h and the furnace is cooled.

[0137] Step S3: Induction melting is performed on the alloy bar to be melted to obtain raw material molten liquid; wherein, during induction melting, the heating power is 10kW and the feed speed of the alloy bar to be melted is 0.4mm / s.

[0138] Step S4: The raw material melt is subjected to gas atomization treatment to prepare TiC reinforced aluminum alloy powder; wherein, by mass percentage, the aluminum alloy powder comprises: Si: 10.5 wt.%; Mg: 0.4 wt.%; Fe: 0.078 wt.%; O: 0.028 wt.%; C: 0.05 wt.%; the remainder is Al.

[0139] Step S5: Perform particle size sieving on the aluminum alloy powder obtained in step S4; wherein, the particle size of the aluminum alloy powder after particle size sieving is in the range of 15μm to 53μm, and the sphericity of the aluminum alloy powder is 0.9, and the hollow powder rate is 0.3%.

[0140] Step S6: A deposited aluminum alloy part is prepared using selective laser melting (SLM) technology, and then subjected to heat treatment. The heat treatment temperature is 320℃, the holding time is 1.5h, and the part is cooled to room temperature under argon protective gas. See Table 8, which shows the tensile mechanical properties of the deposited and heat-treated aluminum alloy parts, respectively.

[0141]

[0142] Table 8 Example 9: Step S1: Mix the high-temperature alloy powder and nano TiC particles in a set ratio to obtain the mixed raw material powder.

[0143] Step S2: The mixed raw material powder is placed in a high-temperature alloy sleeve and the alloy bar to be melted is obtained by hot isostatic pressing; wherein, the hot isostatic pressing process temperature is 1150℃, the pressure is 150MPa, the holding time is 3h and the furnace is cooled.

[0144] Step S3: Induction melting is performed on the alloy bar to be melted to obtain raw material molten liquid; wherein, during induction melting, the heating power is 80kW and the feed speed of the alloy bar to be melted is 0.5mm / s.

[0145] Step S4: The raw material molten liquid is subjected to gas atomization treatment to prepare TiC-reinforced high-temperature alloy powder; wherein, by mass percentage, the TiC-reinforced high-temperature alloy powder comprises: Si: 0.05wt.%; Cr: 18.8wt.%; Nb: 5.42wt.%; Mg: 0.09wt.%; Co: 0.2wt.%; Mo: 2.99wt.%; Al: 0.53wt.%; Ti: 1%wt.%; Ni: 52.49wt.%; O: 0.085wt.%; C: 0.05wt.%; N: 0.004wt.%; H: 0.001wt.%; the remainder is Fe.

[0146] Step S5: Perform particle size sieving on the TiC-reinforced high-temperature alloy powder prepared in step S4; wherein, the particle size of the TiC-reinforced high-temperature alloy powder after particle size sieving is in the range of 15μm to 53μm, and the sphericity of the TiC-reinforced high-temperature alloy powder is 0.9, and the hollow powder rate is 0.3%.

[0147] Step S6: A high-temperature alloy part in the deposited state is prepared using selective laser melting (SLM) technology, and then subjected to heat treatment. The heat treatment process involves holding at 1000℃ for 2 hours, cooling to 700℃ for 5 hours, and then cooling to room temperature under an argon protective gas atmosphere. See Table 9, which shows the tensile mechanical properties of the high-temperature alloy part in the deposited state and the heat-treated state, respectively.

[0148]

[0149] Table 9 Comparative Example 1: Step S1: Mix titanium powder, aluminum powder, vanadium powder and nano TiC particles in a set ratio to obtain the mixed raw material powder.

[0150] Step S2: The mixed raw material powder is placed in a stainless steel sleeve and the alloy bar to be melted is obtained by hot isostatic pressing; wherein the hot isostatic pressing process temperature is 920℃, the pressure is 150MPa, the holding time is 3h and the furnace is cooled.

[0151] Step S3: Induction melting is performed on the alloy bar to be melted to obtain raw material molten liquid; wherein, during induction melting, the heating power is 45kW and the feed speed of the alloy bar to be melted is 1.0mm / s.

[0152] Step S4: The raw material melt is subjected to gas atomization treatment to prepare titanium alloy powder; wherein, by mass percentage, the titanium alloy powder comprises: Al: 6.65wt.%; V: 4.27wt.%; C: 0.005wt.%; Fe: 0.21wt.%; O: 0.15wt.%; N: 0.005wt.%; H: 0.015wt.%; the remainder is Ti.

[0153] Step S5: Perform particle size sieving on the titanium alloy powder obtained in step S4; wherein, the particle size of the titanium alloy powder after particle size sieving is in the range of 15μm to 53μm, and the sphericity of the titanium alloy powder is 0.95, and the hollow powder rate is 0.3%.

[0154] Step S6: A deposited titanium alloy part is prepared using selective laser melting (SLM) technology, and then subjected to heat treatment. The heat treatment temperature is 800℃, the holding time is 4 hours, and the part is cooled to room temperature under an argon protective gas atmosphere. See [link / reference]. Figure 13 and Figure 14 The diagrams show the metallographic structures of the deposited and heat-treated titanium alloy parts, respectively. Table 10 shows the tensile mechanical properties of the deposited and heat-treated titanium alloy parts, respectively.

[0155]

[0156] Table 10 Comparative Example 2: Step S1: Mix titanium powder, aluminum powder, vanadium powder and nano TiC particles in a set ratio to obtain the mixed raw material powder.

[0157] Step S2: The mixed raw material powder is placed in a stainless steel sleeve and the alloy bar to be melted is obtained by hot isostatic pressing; wherein the hot isostatic pressing process temperature is 920℃, the pressure is 150MPa, the holding time is 3h and the furnace is cooled.

[0158] Step S3: Induction melting is performed on the alloy bar to be melted to obtain raw material molten liquid; wherein, during induction melting, the heating power is 45kW and the feed speed of the alloy bar to be melted is 1.0mm / s.

[0159] Step S4: The raw material melt is subjected to gas atomization treatment to prepare titanium alloy powder; wherein, by mass percentage, the titanium alloy powder comprises: Al: 6.50 wt.%; V: 4.0 wt.%; C: 0.2 wt.%; Fe: 0.17 wt.%; O: 0.15 wt.%; N: 0.015 wt.%; H: 0.015 wt.%; the remainder is Ti.

[0160] Step S5: Perform particle size sieving on the titanium alloy powder obtained in step S4; wherein, the particle size of the titanium alloy powder after particle size sieving is in the range of 15μm to 53μm, and the sphericity of the titanium alloy powder is 0.9, and the hollow powder rate is 0.3%.

[0161] Step S6: A deposited titanium alloy part is prepared using selective laser melting (SLM) technology, and then subjected to heat treatment. The heat treatment temperature is 800℃, the holding time is 4 hours, and the part is cooled to room temperature under an argon protective gas atmosphere. See [link / reference]. Figure 15 and Figure 16 The diagrams show the metallographic structures of titanium alloy parts in the deposited state and the heat-treated state, respectively. Figure 15 and Figure 16 It can be seen that the titanium alloy parts manufactured in Comparative Example 2 exhibited cracking. See Table 11, which shows the tensile mechanical properties of the deposited titanium alloy parts and the heat-treated titanium alloy parts, respectively.

[0162]

[0163] Table 11 Comparative Example 3: Step S1: Mechanically mix titanium alloy powder with nano-TiC particles to obtain TiC-reinforced titanium alloy powder; wherein, by mass percentage, the TiC-reinforced titanium alloy powder comprises: Al: 6.75 wt.%; V: 4.5 wt.%; C: 0.10 wt.%; Fe: 0.15 wt.%; O: 0.10 wt.%; N: 0.015 wt.%; H: 0.01 wt.%; the remainder being Ti.

[0164] Step S2: Perform particle size sieving on the TiC reinforced titanium alloy powder obtained in step S1; wherein, the particle size of the TiC reinforced titanium alloy powder after particle size sieving is in the range of 15μm to 53μm, and the sphericity of the TiC reinforced titanium alloy powder is 0.9, and the hollow powder rate is 0.3%.

[0165] Step S3: A TiC-reinforced titanium alloy part in the deposited state is manufactured using selective laser melting (SLM) technology, and then subjected to heat treatment. The heat treatment temperature is 800℃, the holding time is 4 hours, and the part is cooled to room temperature under an argon protective gas atmosphere. See Table 12, which shows the tensile mechanical properties of the deposited TiC-reinforced titanium alloy part and the heat-treated TiC-reinforced titanium alloy part, respectively.

[0166]

[0167] Table 12 Comparative Example 4: Step S1: The aluminum-based master alloy of a set ratio is melted three times in a vacuum environment to obtain molten aluminum alloy.

[0168] Step S2: After homogenizing the molten aluminum alloy obtained in step S1 by adding an aluminum-based master alloy containing nano-TiC particles, the alloy is then cast to obtain a cast aluminum alloy; wherein the preset content of C is 0.1 wt.%.

[0169] Step S3: Induction melting is performed on the cast aluminum alloy to obtain raw material molten liquid; wherein, during induction melting, the heating power is 40kW and the feed speed of the alloy bar to be melted is 0.35mm / s.

[0170] Step S4: The raw material molten liquid is subjected to gas atomization treatment to prepare aluminum alloy powder; Step S5: Perform particle size sieving on the aluminum alloy powder obtained in step S4; wherein, the particle size of the aluminum alloy powder after particle size sieving is in the range of 15μm to 53μm, and the sphericity of the aluminum alloy powder is 0.9, and the hollow powder rate is 0.3%.

[0171] Tests showed that the carbon content in the aluminum alloy powder was less than 0.1 wt.%. Furthermore, during the melting and solidification of the molten aluminum alloy, the nano-TiC particles tended to grow and exhibited both floating and sinking phenomena, resulting in incomplete and uneven mixing of the nano-TiC particles into the aluminum alloy. In Comparative Example 4, nano-TiC particles could not be directly added; an aluminum-based master alloy containing nano-TiC particles needed to be smelted, requiring three smelting processes to ensure complete removal of impurities from the master alloy. This preparation process was cumbersome and the composition was uncontrollable.

[0172] As can be seen from Examples 1 to 9 and Comparative Examples 1 to 4 above, the method for preparing alloy powder for additive manufacturing provided in this disclosure enables the reinforcing nanoparticles to be uniformly mixed into the initial raw material powder. This prevents uneven distribution and agglomeration of the reinforcing nanoparticles in the prepared alloy powder, thereby improving the strength of the additively manufactured alloy parts through the reinforcing phase effect of the nanoparticles. Furthermore, adding reinforcing nanoparticles can significantly improve the tensile strength and yield strength of the additively manufactured alloy parts, with good matching between strength and plasticity. However, when the amount of reinforcing nanoparticles added is too high, the plasticity of the manufactured alloy parts is severely reduced, and even cracking may occur.

[0173] It should be noted that the technical solutions described in this disclosure can be combined arbitrarily as long as they do not conflict.

[0174] The above description is merely a specific embodiment of this disclosure, but the scope of protection of this disclosure is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this disclosure should be included within the scope of protection of this disclosure. Therefore, the scope of protection of this disclosure should be determined by the scope of the claims.

Claims

1. A method for the production of an alloy powder for additive manufacturing, characterized in that The preparation method includes: The initial raw material powder and the reinforcing nanoparticles are mixed in a set ratio to obtain the mixed raw material powder. The mixed raw material powder is placed in a sleeve and the alloy rod to be melted is obtained by hot isostatic pressing. The alloy rod to be melted is subjected to induction melting to obtain raw material molten liquid; The raw material molten liquid is subjected to gas atomization treatment to prepare alloy powder.

2. The method of producing an alloy powder for additive manufacturing according to claim 1, characterized in that, The enhanced nanoparticles include one or more of the following: nanocarbide particles, nanoboride particles, nanooxide particles, and nanonitride particles.

3. The method of claim 1, wherein the alloy powder for additive manufacturing is prepared by a method comprising: The reinforcing nanoparticles include nano-TiC particles and / or nano-TiB2 particles. ​ 4. The method of claim 1, wherein the alloy powder for additive manufacturing is prepared by a method comprising: The preparation method includes: ​ The mixed raw material powder is obtained by mixing titanium powder, aluminum powder, vanadium powder and nano TiC particles in a set ratio. The mixed raw material powder is placed in the package, and the alloy rod to be melted is obtained by the hot isostatic pressing method; The alloy rod to be melted is subjected to induction melting to obtain raw material molten liquid; The raw material molten liquid is subjected to gas atomization treatment to prepare titanium alloy powder; The titanium alloy powder, by mass percentage, comprises: Al: 5.5 wt.% to 6.75 wt.%; V: 3.5 wt.% to 4.5 wt.%; C: 0.05 wt.% to 0.15 wt.%; Fe: ≤0.30 wt.%; O: ≤0.20 wt.%; N: ≤0.05 wt.%; H: ≤0.015 wt.%; the remainder being Ti.

5. The method of producing an alloy powder for additive manufacturing according to any one of claims 1 to 4, characterized in that, The hot isostatic pressing method corresponds to a process temperature greater than or equal to 900℃ and less than or equal to 950℃, a pressure greater than or equal to 120MPa and less than or equal to 150MPa, a heat preservation and pressure holding time greater than or equal to 1h and less than or equal to 5h, and cooling with the furnace.

6. The method of producing an alloy powder for additive manufacturing according to any one of claims 1 to 3, characterized in that, The hot isostatic pressing method corresponds to a process temperature greater than or equal to 400℃ and less than or equal to 500℃, a pressure greater than or equal to 120MPa and less than or equal to 150MPa, a heat preservation and pressure holding time greater than or equal to 1h and less than or equal to 5h, and cooling with the furnace.

7. The method for preparing alloy powder for additive manufacturing according to any one of claims 1 to 3, characterized in that, The hot isostatic pressing method corresponds to a process temperature greater than or equal to 1100℃ and less than or equal to 1200℃, a pressure greater than or equal to 120MPa and less than or equal to 150MPa, a heat preservation and pressure holding time greater than or equal to 1h and less than or equal to 5h, and cooling with the furnace.

8. The method for preparing alloy powder for additive manufacturing according to any one of claims 1 to 4, characterized in that, The diameter of the alloy bar to be melted is greater than or equal to 50 mm and less than or equal to 70 mm, and the length of the alloy bar to be melted is greater than or equal to 600 mm and less than or equal to 800 mm.

9. The method for preparing alloy powder for additive manufacturing according to any one of claims 1 to 4, characterized in that, During the induction melting process, the heating power is in the range of 10kW to 80kW, and the feed speed of the alloy bar to be melted is in the range of 0.2mm / s to 3.0mm / s.

10. The method for preparing alloy powder for additive manufacturing according to claim 1, characterized in that, The preparation method further includes: performing particle size sieving on the prepared alloy powder.

11. An alloy powder for additive manufacturing, characterized in that, The alloy powder is prepared by the method for preparing alloy powder for additive manufacturing according to any one of claims 1 to 10.

12. The alloy powder for additive manufacturing according to claim 11, characterized in that, The alloy powder has a particle size greater than or equal to 15 μm and less than or equal to 53 μm, or the alloy powder has a particle size greater than or equal to 75 μm and less than or equal to 180 μm.

13. The alloy powder for additive manufacturing according to claim 11 or 12, characterized in that, The alloy powder has a sphericity greater than or equal to 0.9 and a hollow powder ratio less than or equal to 0.3%.

14. An alloy part, characterized in that, The alloy part is obtained by additive manufacturing using alloy powder for additive manufacturing according to any one of claims 11 to 13.

Images