A kind of nanoparticle in situ enhanced nickel-based alloy wire for electric arc additive manufacturing and its preparation method

Abstract

The application discloses a kind of nanometer particle in-situ reinforced nickel-based alloy electric arc additive manufacturing wire and its preparation method.A kind of nanometer particle in-situ reinforced nickel-based alloy electric arc additive manufacturing wire is constituted by outer layer's coating and inner layer's powder, powder is added nano-grade LaB6 particle, and the filling rate of powder is 10%-23%.The application adds LaB6 nano-particle to the powder, reacts with Ti element in nickel-based alloy wire at high temperature, generates La2O3 and TiB2 particle in-situ, these particles and matrix have good wetting relationship, uniformly distribute in alloy matrix after solidification, improve strength at the same time, promote heterogeneous nucleation of equiaxed crystal, refine grain, finally improve the strength and plasticity of alloy, in addition, La2O3 particle generated in-situ is also beneficial to the rapid formation of alloy surface Cr2O3 oxide layer during high-temperature oxidation, further improves the high-temperature oxidation resistance of alloy.

Description

Technical fields:

[0001] This invention relates to the field of nickel-based alloy wire technology, specifically to a wire for arc additive manufacturing of nickel-based alloys reinforced by nanoparticles in situ and its preparation method. Background technology:

[0002] Inconel 625 alloy is a widely used nickel-based alloy. Due to its excellent strength, oxidation resistance, and corrosion resistance at high temperatures, it is commonly used in aerospace, petrochemical, and marine construction fields, such as combustion chambers for aerospace propulsion and industrial gas turbines, high-pressure turbines (blades, blades, disks, shafts), shrouds, seals, low-pressure turbine blades and turbine housings, and turbine engines. Traditional manufacturing methods for Inconel 625 alloy structural components include forging and casting. However, due to its high hardness, high-temperature strength, and low thermal diffusivity, subtractive manufacturing of Inconel 625 alloy structural components is costly, has low material utilization, and is difficult to produce complex structures.

[0003] Arc additive manufacturing is a processing technology that combines welding methods with computer-aided design. Its principle is to use an electric arc to melt a wire and manufacture the desired parts according to a pre-set path. It can also construct very complex geometries using a layer-by-layer welding process. Compared to traditional casting and forging methods, arc additive manufacturing overcomes the waste caused by post-forming subtraction, resulting in higher material utilization. Furthermore, computer assistance significantly reduces design and manufacturing time. Compared to powder laser additive manufacturing, the wire used in arc additive manufacturing is easier to preserve and has a higher deposition rate. Therefore, arc additive manufacturing is more suitable for the industrial application of Inconel 625 alloy.

[0004] However, arc additive manufacturing of Inconel 625 alloy still faces certain challenges. Due to the layer-by-layer printing characteristic of additive manufacturing, repeated heating and cooling occur, leading to in-situ heat treatment of the deposited alloy during the manufacturing process. This promotes epitaxial growth of the solidified structure and results in coarse grains. Simultaneously, it causes elements such as Nb and Mo to enrich in the interdendritic region at the end of solidification, forming secondary phases such as Laves phase and MC carbides. While this improves strength, it significantly impairs ductility. Secondly, due to Nb segregation, a large amount of Nb forms in the surface Cr2O3 oxide layer during the high-temperature oxidation of Inconel 625 alloy. 1.5 Cr 0.5 O4 particles reduce the adhesion of the Cr2O3 oxide layer to the substrate surface and create a large number of voids in the oxide layer, ultimately leading to a decrease in the high-temperature oxidation resistance of Inconel 625 alloy.

[0005] Research on high-performance nickel-based alloys has revealed that adding specific ceramic particles can effectively improve oxidation resistance and ductility. These ceramic particles are uniformly distributed in the solidification structure of the alloy, playing a role in dispersion strengthening. Furthermore, some ceramic particles can promote the transformation of coarse columnar crystals to equiaxed crystals, refining the grain size and providing more diffusion channels for Cr elements during high-temperature oxidation. This promotes the rapid formation of a dense oxide layer on the alloy surface, thereby improving the alloy's high-temperature oxidation resistance. For example, CN116623040A discloses a method for refining the microstructure of nickel-based alloys and its application. This method introduces nanoscale La2O3 (100-300 nm, average size 200 nm) with a semi-coherent interface to the matrix, causing it to generate a large number of dispersed nucleation points in the molten pool, promoting the transformation of columnar crystals to equiaxed crystals and refining the grain size. However, directly added La2O3 particles have poor wetting relationships with the matrix, and the gaps between the particles and the matrix easily become initiation points for tensile fracture and intrusion points for oxidation. Mechanical properties and high-temperature oxidation resistance are not sufficiently improved, and these particles are prone to agglomeration and coarsening, severely affecting their strengthening effect. Patent CN112008087A discloses a method for enhancing the high-temperature oxidation resistance of nickel-based superalloys using carbon nanomaterials. This method utilizes a dense nickel layer coated on the surface of carbon nanomaterials and obtains a uniformly dispersed mixed powder of carbon nanomaterials through a specific ball milling process, achieving further uniform dispersion of the carbon nanomaterials and solving the problem of poor high-temperature oxidation resistance caused by the easy agglomeration of carbon nanomaterials and poor interfacial bonding with the matrix.

[0006] Zhang's article, "Microhardness and microstructure evolution of TiB2 reinforced Inconel 625 / TiB2 composite produced by selective laser melting," points out that adding TiB2 to nickel-based alloys can refine grains and increase hardness, but the introduced TiB2 tends to aggregate between grains, ultimately impairing the alloy's plasticity. Wang's article, "Rare earth elements modification of laser-clad nickel-based alloy coatings," indicates that the addition of La2O3 can promote grain refinement in nickel-based alloy coatings. This is because La2O3 has a high melting point, providing heterogeneous nucleation sites during the cooling and crystallization process of nickel-based alloys, effectively promoting equiaxed grain transformation and hindering grain growth. However, undissolved La2O3 particles are prone to agglomeration, significantly increasing the number of inclusions in the melt pool.

[0007] In summary, the use of ceramic particles to promote alloy grain refinement has been studied to some extent, and it can improve the strength and high-temperature oxidation resistance of alloys. However, directly adding ceramic particles is difficult to achieve uniform distribution in the matrix due to poor wettability with the alloy matrix. Furthermore, directly introduced ceramic particles tend to agglomerate and coarsen into large particles at high temperatures, ultimately leading to the failure of nano-ceramic particles and easy cracking during cladding, resulting in a decrease in the plasticity of the alloy. Therefore, it is necessary to explore a novel method for introducing nanoparticles that avoids agglomeration and coarsening of nanoparticles while ensuring good wettability with the matrix. Summary of the Invention:

[0008] To overcome the aforementioned problems in existing technologies, this invention provides a nanoparticle-reinforced nickel-based alloy arc additive manufacturing wire and its preparation method. This invention involves adding LaB6 nanoparticles to the core powder, which react with Ti elements in the nickel-based alloy wire at high temperature to generate La2O3 and TiB2 particles in situ. These particles have good wetting relationships with the matrix and, after solidification, are uniformly distributed within the alloy matrix. This not only improves strength but also promotes heterogeneous nucleation of equiaxed crystals, refines the grain size, and ultimately enhances the alloy's strength and ductility. Furthermore, the in-situ generated La2O3 particles facilitate the rapid formation of a Cr2O3 oxide layer on the alloy surface during high-temperature oxidation, further improving the alloy's high-temperature oxidation resistance.

[0009] The first objective of this invention is to provide a wire for arc additive manufacturing of nickel-based alloys reinforced in situ with nanoparticles, which consists of an outer coating and an inner core powder, wherein the core powder contains nano-sized LaB6 particles and the core powder has a filling rate of 10%-23%.

[0010] Preferably, the core powder, by weight percentage (100%), is composed of the following raw materials: Cr 20%-26%, Mo 7%-10%, Nb 3%-5%, Ti 0.2%-1%, C<0.05%, Cu<0.5%, Fe<5%, Mn<0.5%, P<0.02%, S<0.015%, Si<0.5%, Al<0.4%, LaB6 0.25%-1%, rutile 1%-1.4%, MnO≤0.5%, feldspar 1%-2.8%, mullite 0.4%-1.0%, with the remainder being Ni.

[0011] Further preferably, the core powder, based on a total mass percentage of 100%, is composed of the following raw materials: Cr 20%-23%, Mo 8%-10%, Nb 3.15%-4.15%, Ti 0.5%-1%, C<0.05%, Cu<0.5%, Fe<5%, Mn<0.5%, P<0.02%, S<0.015%, Si<0.5%, Al<0.4%, LaB6 0.25%-0.5%, rutile 1%-1.4%, MnO≤0.5%, feldspar 1%-2.8%, mullite 0.4%-1.0%, with the remainder being Ni.

[0012] Preferably, the coating is an Inconel 625 coating.

[0013] Preferably, the diameter of the wire is 1.2 mm.

[0014] Preferably, the nanoscale LaB6 particles have a particle size of 50-150 nm and an average size of 100 nm.

[0015] The present invention proposes a nickel-based alloy arc additive manufacturing wire incorporating LaB6 nanoparticles with an average size of 100 nm. Through in-situ reaction with the nickel-based alloy matrix at high temperature, dispersed La2O3 is generated. During additive manufacturing solidification, this La2O3 serves as an effective heterogeneous nucleation site, promoting equiaxed crystal nucleation and refining the grain size. Simultaneously, the generated TiB2 particles are uniformly distributed in the matrix, significantly improving the mechanical properties of the alloy. Furthermore, the effective grain refinement increases the number of grain boundaries, providing more diffusion channels for Cr elements during high-temperature oxidation, promoting the rapid formation of a dense oxide layer. The in-situ generated La2O3 particles also act as nucleation sites for oxides on the alloy surface, increasing the density of the oxide film, thereby improving the high-temperature oxidation resistance of the arc additive manufactured nickel-based alloy.

[0016] The mullite, feldspar, and rutile added to the flux-cored powder act as slag-forming agents, stabilizing the electric arc, regulating the physical properties of the molten slag, and protecting the weld droplets and molten pool. The MnO added to the flux-cored powder has a desulfurization effect; the Mn element reacts with S to form high-melting-point MnS, which can prevent the formation of FeS, thereby reducing the hot cracking susceptibility of nickel-based alloys. The reaction processes are: 2MnO→2Mn+O2, Si+O2→SiO2, Mn+S→MnS.

[0017] A second objective of this invention is to provide a method for preparing the aforementioned filament for arc additive manufacturing, comprising the following steps:

[0018] S1. Add the core powder and LaB6 nanoparticles to the ball mill container in proportion. After ball milling, dry the mixed powder.

[0019] S2. After drying the coating material, roll it into a U-shaped coating. Then, add the mixed powder dried in step S1 into the U-shaped coating according to the above filling ratio. Then, draw the filament into the filament for arc additive manufacturing.

[0020] Preferably, the ball milling process parameters in step S1 are set as follows: forward rotation for 14-16 minutes, stop for 4-6 minutes, reverse rotation for 14-16 minutes, stop for 4-6 minutes, and repeat the above steps for a total time of 72-88 minutes.

[0021] Further preferred, the ball milling process parameters in step S1 are set as follows: forward rotation for 15 minutes, stop for 5 minutes, reverse rotation for 15 minutes, stop for 5 minutes, and repeat the above steps for a total time of 80 minutes.

[0022] To uniformly mix the core powder and LaB6 nanoparticles, this invention obtained optimal ball milling parameters by continuously adjusting the milling process parameters. The average sizes of the core powder and LaB6 nanoparticles used in the core milling were 150 mm and 100 nm, respectively. When the ball milling time was long (30 min forward, 20 min stop, 30 min reverse), some stratification of the LaB6 and Inconel 625 core powders occurred. This is because the longer the fine LaB6 nanoparticles rotate in the same direction, the greater the inertia of the ball mill. Under the action of van der Waals forces, the LaB6 particles are more likely to agglomerate. During subsequent reverse ball milling, the previously agglomerated LaB6 particles will separate to some extent, but agglomeration will recur after a long reverse time, ultimately resulting in the stratification of the LaB6 and Inconel 625 core powders. To solve this problem, this invention improved the ball milling parameters and shortened the forward and reverse rotation times, ultimately resulting in a uniform distribution of LaB6 nanoparticles on the surface of the core powder.

[0023] Preferably, the drying conditions in step S1 are: heating to 100°C and holding at that temperature for 1 hour.

[0024] A third object of the present invention is to provide the application of the aforementioned arc additive manufacturing filament in the fabrication of Inconel 625 arc additive manufacturing parts.

[0025] Compared with the prior art, the present invention has the following advantages:

[0026] 1. The electric arc additive manufacturing filament produced by this invention has good formability after additive manufacturing, and is free from surface defects and internal pores.

[0027] 2. In this invention, LaB6 nanoparticles react in situ with nickel-based alloys during additive manufacturing. The resulting La2O3 and TiB2 are uniformly distributed in the matrix and have good wetting relationship with the matrix. This can play a role in dispersion strengthening and inducing heterogeneous nucleation, thereby significantly improving the strength of the deposited metal while also exhibiting excellent plasticity.

[0028] 3. This invention effectively refines the grains of La2O3, thereby increasing the number of grain boundaries. This provides more diffusion channels for Cr elements during high-temperature oxidation, promoting the rapid formation of a dense oxide layer. Furthermore, the in-situ generated La2O3 particles can also serve as nucleation sites for oxides on the alloy surface, increasing the density of the oxide film and thus improving the high-temperature oxidation resistance of nickel-based alloys manufactured by arc additive manufacturing.

[0029] 4. In the process of ball milling and mixing drug core powder and LaB6 nanoparticles, this invention solves the problem of LaB6 nanoparticles agglomerating due to excessive inertia of the ball mill by shortening the time of one forward and reverse rotation and increasing the number of forward and reverse rotations without changing the total ball milling time. This effectively makes the LaB6 nanoparticles evenly distributed on the drug core powder.

[0030] 5. Compared with solid welding wire, the flux-cored welding wire proposed in this invention has greater flexibility in controlling the alloy composition. The composition of the deposited metal can be controlled by directly changing the flux composition, making it easier to regulate its composition. On the other hand, the production cost of flux-cored welding wire is lower.

[0031] In summary, this invention, by adding LaB6 nanoparticles to the core powder and allowing them to react in situ with a nickel-based alloy, and employing an improved ball milling process, promotes the uniform distribution of the in-situ generated reinforcing particles within the nickel-based alloy matrix. This not only ensures increased strength but also enhances the plasticity and high-temperature oxidation resistance of the arc additive manufacturing component. It solves the problems of poor wettability between ceramic particles and the alloy matrix, easy agglomeration of ceramic particles, and easy formation of coarse and harmful phases at grain boundaries when ceramic particles are directly added in arc additive manufacturing. Attached image description:

[0032] Figure 1 This is a microstructure diagram of Example 3;

[0033] Figure 2 This is a microscopic image of the tissue structure in Comparative Example 1;

[0034] Figure 3 This is a microstructure diagram of Comparative Example 2. Detailed implementation method:

[0035] The following embodiments are further illustrations of the present invention, but not limitations thereof.

[0036] Unless otherwise defined, all technical terms used herein have the same meaning as commonly understood by those skilled in the art. The technical terms used herein are for the purpose of describing particular embodiments only and are not intended to limit the scope of the invention. Unless otherwise specified, the experimental materials and reagents used herein are commercially available products conventionally available in this technical field.

[0037] Example 1

[0038] A nickel-based alloy arc additive manufacturing wire uses Inconel 625 tape as the outer sheath to wrap flux-cored powder. The flux-cored powder filling rate is 15%, and the drawn diameter of the flux-cored wire is 1.2 mm. Based on a total mass percentage of 100%, the flux-cored powder consists of the following raw materials: Cr 23%, Mo 8.5%, Nb 4%, Ti 0.6%, LaB6 1%, C 0.04%, Cu 0.4%, Fe 4%, Mn 0.4%, P 0.01%, S 0.01%, Si 0.4%, Al 0.3%, rutile 1.2%, MnO 0.4%, feldspar 1.9%, mullite 0.7%, with the remainder being Ni.

[0039] The specific steps of the preparation method for the above-mentioned nickel-based alloy arc additive manufacturing wire are as follows:

[0040] Step S1: Add the core powder and LaB6 nanoparticles to the ball mill jar in proportion. Set the ball milling process parameters as follows: rotate forward for 15 minutes, stop for 5 minutes, rotate backward for 15 minutes, stop for 5 minutes, and repeat the above steps for a total time of 80 minutes. After ball milling, put the mixed powder into a drying oven and heat it to 100°C. Keep it at that temperature for 1 hour to obtain dried powder.

[0041] Step S2: The Inconel 625 strip is placed in a large drying oven and heated to 100°C and kept at that temperature for 1 hour. After cooling, the Inconel 625 strip is rolled into a U-shape using forming rollers in a dust-free workshop. Then, the mixed powder obtained in step S1 is added to the U-shaped strip according to the above filling rate through a powder feeding device. Finally, the strip is rolled into a core filament with a diameter of 1.2 mm through a drawing die.

[0042] Example 2:

[0043] A nickel-based alloy arc additive manufacturing wire uses Inconel 625 tape as the outer sheath to wrap flux-cored powder. The flux-cored powder filling rate is 15%, and the drawn diameter of the flux-cored wire is 1.2 mm. Based on a total mass percentage of 100%, the flux-cored powder consists of the following raw materials: Cr 23%, Mo 8.5%, Nb 4%, Ti 0.6%, LaB6 0.75%, C 0.04%, Cu 0.4%, Fe 4%, Mn 0.4%, P 0.01%, S 0.01%, Si 0.4%, Al 0.3%, rutile 1.2%, MnO 0.4%, feldspar 1.9%, mullite 0.7%, with the remainder being Ni.

[0044] The preparation method of the nickel-based alloy arc additive manufacturing wire is the same as in Example 1.

[0045] Example 3:

[0046] A nickel-based alloy arc additive manufacturing wire uses Inconel 625 tape as the outer sheath to wrap flux-cored powder. The flux-cored powder filling rate is 15%, and the drawn diameter of the flux-cored wire is 1.2 mm. Based on a total mass percentage of 100%, the flux-cored powder consists of the following raw materials: Cr 23%, Mo 8.5%, Nb 4%, Ti 0.6%, LaB6 0.5%, C 0.04%, Cu 0.4%, Fe 4%, Mn 0.4%, P 0.01%, S 0.01%, Si 0.4%, Al 0.3%, rutile 1.2%, MnO 0.4%, feldspar 1.9%, mullite 0.7%, with the remainder being Ni.

[0047] The preparation method of the nickel-based alloy arc additive manufacturing wire is the same as in Example 1.

[0048] like Figure 1 As shown, the arc additive manufacturing structure obtained in this embodiment is composed entirely of fine equiaxed crystals. This structure can improve the strength and plasticity of the structure, as well as its high-temperature oxidation resistance.

[0049] Example 4:

[0050] A nickel-based alloy arc additive manufacturing wire uses Inconel 625 tape as the outer sheath to wrap flux-cored powder. The flux-cored powder filling rate is 15%, and the drawn diameter of the flux-cored wire is 1.2 mm. Based on a total mass percentage of 100%, the flux-cored powder consists of the following raw materials: Cr 23%, Mo 8.5%, Nb 4%, Ti 0.6%, LaB6 0.25%, C 0.04%, Cu 0.4%, Fe 4%, Mn 0.4%, P 0.01%, S 0.01%, Si 0.4%, Al 0.3%, rutile 1.2%, MnO 0.4%, feldspar 1.9%, mullite 0.7%, with the remainder being Ni.

[0051] The preparation method of the nickel-based alloy arc additive manufacturing wire is the same as in Example 1.

[0052] Comparative Example 1:

[0053] Referring to Example 1, the difference is that the core powder does not contain LaB6 nanoparticles.

[0054] A nickel-based alloy arc additive manufacturing wire uses Inconel 625 tape as the outer sheath to wrap flux-cored powder. The flux-cored powder filling rate is 15%, and the drawn diameter of the flux-cored wire is 1.2 mm. Based on a total mass percentage of 100%, the flux-cored powder consists of the following raw materials: Cr 23%, Mo 8.5%, Nb 4%, Ti 0.6%, C 0.04%, Cu 0.4%, Fe 4%, Mn 0.4%, P 0.01%, S 0.01%, Si 0.4%, Al 0.3%, rutile 1.2%, MnO 0.4%, feldspar 1.9%, mullite 0.7%, with the remainder being Ni.

[0055] The preparation method of the nickel-based alloy arc additive manufacturing wire is the same as in Example 1.

[0056] like Figure 2 As shown, the arc additive manufacturing structure obtained in this comparative example is composed of coarse columnar crystals. This structure has poor strength and plasticity, and is prone to the segregation of elements such as Nb and Mo in nickel-based alloys, which reduces the high-temperature oxidation resistance of the structure.

[0057] Comparative Example 2:

[0058] Referring to Example 1, the difference is that the core powder contains La2O3 nanoparticles with an average particle size of 100 nm.

[0059] A nickel-based alloy arc additive manufacturing wire uses Inconel 625 tape as the outer sheath to wrap flux-cored powder. The flux-cored powder filling rate is 15%, and the drawn diameter of the flux-cored wire is 1.2 mm. Based on a total mass percentage of 100%, the flux-cored powder consists of the following raw materials: Cr 23%, Mo 8.5%, Nb 4%, Ti 0.6%, La₂O₃ 1%, C 0.04%, Cu 0.4%, Fe 4%, Mn 0.4%, P 0.01%, S 0.01%, Si 0.4%, Al 0.3%, rutile 1.2%, MnO 0.4%, feldspar 1.9%, mullite 0.7%, with the remainder being Ni.

[0060] The preparation method of the nickel-based alloy arc additive manufacturing wire is the same as in Example 1.

[0061] like Figure 3 As shown, the arc additive manufacturing structure obtained in this comparative example consists of coarse columnar crystals and some equiaxed crystals. This indicates that the added La2O3 particles may have greatly reduced their effect on strengthening nickel-based alloys due to poor wetting relationship with the matrix or partial agglomeration and coarseness.

[0062] The flux-cored welding wires suitable for arc additive manufacturing prepared in Examples 1-4 and Comparative Examples 1-2 were deposited on Q235 low-carbon low-alloy steel using arc additive manufacturing (CMT) equipment. The welding speed was 7 mm / s, the welding voltage was 167 V, the welding current was 26.6 A, the wire extension was 12 mm, the interpass cooling was 150 °C, and the shielding gas was 98% Ar + CO2 with a flow rate of 10 L / min. Furthermore, the performance of the additively manufactured structural parts was tested, and the mechanical property testing methods referred to GB / T 39254-2020 "General Rules for Evaluation of Mechanical Properties of Additively Manufactured Metal Parts". High-temperature oxidation tests were conducted in a high-temperature muffle furnace without a protective atmosphere at a temperature of 1000 °C for 150 h. The experimental procedures and testing methods followed the national standard GB / T13303-91 "Methods for Determination of Oxidation Resistance of Steel". Using Inconel 625 flux-cored wire without LaB6 nanoparticles as a comparative example, the performance test results are shown in Table 1 below.

[0063] Table 1. Performance test results of additively manufactured structural components of Examples 1-4 and Comparative Examples 1-2.

[0064]

[0065]

[0066] Example 5

[0067] A nickel-based alloy arc additive manufacturing wire uses Inconel 625 tape as the outer sheath to wrap flux-cored powder. The flux-cored powder filling rate is 10%, and the drawn diameter of the flux-cored wire is 1.2 mm. Based on a 100% total mass percentage, the flux-cored powder consists of the following raw materials: Cr 20%, Mo 7%, Nb 3%, Ti 0.2%, C 0.04%, Cu 0.4%, Fe 4%, Mn 0.4%, P 0.01%, S 0.01%, Si 0.4%, Al 0.3%, LaB6 0.5%, rutile 1%, MnO 0.5%, feldspar 1%, mullite 0.4%, with the remainder being Ni.

[0068] The specific steps of the preparation method for the above-mentioned nickel-based alloy arc additive manufacturing wire are as follows:

[0069] Step S1: Add the core powder and LaB6 nanoparticles to the ball mill jar in proportion. Set the ball milling process parameters as follows: rotate forward for 14 min, stop for 4 min, rotate backward for 14 min, stop for 4 min, repeat the above steps, and the total time is 72 min. After ball milling, put the mixed powder into a drying oven and heat it to 100℃. Keep it at that temperature for 1 h to obtain dried powder.

[0070] Step S2: The Inconel 625 strip is placed in a large drying oven and heated to 100°C and kept at that temperature for 1 hour. After cooling, the Inconel 625 strip is rolled into a U-shape using forming rollers in a dust-free workshop. Then, the mixed powder obtained in step S1 is added to the U-shaped strip according to the above filling rate through a powder feeding device. Finally, the strip is rolled into a core filament with a diameter of 1.2 mm through a drawing die.

[0071] Example 6

[0072] A nickel-based alloy arc additive manufacturing wire uses Inconel 625 tape as the outer sheath to wrap flux-cored powder. The flux-cored powder filling rate is 23%, and the drawn diameter of the flux-cored wire is 1.2 mm. Based on a total mass percentage of 100%, the flux-cored powder consists of the following raw materials: Cr 26%, Mo 10%, Nb 5%, Ti 1%, C 0.04%, Cu 0.4%, Fe 4%, Mn 0.4%, P 0.01%, S 0.01%, Si 0.4%, Al 0.3%, LaB6 0.5%, rutile 1.4%, MnO 0.5%, feldspar 2.8%, mullite 1.0%, with the remainder being Ni.

[0073] The specific steps of the preparation method for the above-mentioned nickel-based alloy arc additive manufacturing wire are as follows:

[0074] Step S1: Add the core powder and LaB6 nanoparticles to the ball mill jar in proportion. Set the ball milling process parameters as follows: forward rotation for 16 min, stop for 6 min, reverse rotation for 16 min, stop for 6 min, repeat the above steps, and the total time is 88 min. After ball milling, put the mixed powder into a drying oven and heat it to 100℃. Keep it at that temperature for 1 h to obtain dried powder.

[0075] Step S2: The Inconel 625 strip is placed in a large drying oven and heated to 100°C and kept at that temperature for 1 hour. After cooling, the Inconel 625 strip is rolled into a U-shape using forming rollers in a dust-free workshop. Then, the mixed powder obtained in step S1 is added to the U-shaped strip according to the above filling rate through a powder feeding device. Finally, the strip is rolled into a core filament with a diameter of 1.2 mm through a drawing die.

[0076] The above description of the embodiments is only for the purpose of helping to understand the technical solution and core idea of ​​the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made to the present invention without departing from the principle of the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. A wire for arc additive manufacturing of nickel-based alloys reinforced in situ with nanoparticles, comprising an outer coating and an inner core powder, characterized in that, The core powder contains nano-sized LaB6 particles, with a filling rate of 10%-23%. Based on a total mass percentage of 100%, the core powder is composed of the following raw materials. Composition: Cr 20%-26%, Mo 7%-10%, Nb 3%-5%, Ti 0.2%-1%, C<0.05%, Cu<0.5%, Fe<5%, Mn<0.5%, P<0.02%, S<0.015%, Si<0.5%, Al<0.4%, LaB6 0.25%-1%, rutile 1%-1.4%, MnO≤0.5%, feldspar 1%-2.8%, mullite 0.4%-1.0%, balance Ni; the nano-sized LaB6 particles have a particle size of 50-150 nm and an average size of 100 nm. The method for preparing the filament for arc additive manufacturing includes the following steps: S1. Add the core powder and LaB6 nanoparticles to the ball mill container in proportion. After ball milling, dry the mixed powder. Set the ball milling process parameters as follows: forward rotation for 14-16 min, stop for 4-6 min, reverse rotation for 14-16 min, stop for 4-6 min, repeat the above steps, and the total time is 72-88 min. S2. After drying the coating material, roll it into a U-shaped coating. Then, add the mixed powder dried in step S1 into the U-shaped coating according to the above filling ratio. Then, draw the filament into the filament for arc additive manufacturing.

2. The filament for arc additive manufacturing according to claim 1, characterized in that, The core powder, calculated as 100% by total mass, is composed of the following raw materials. Composition: Cr 20%-23%, Mo 8%-10%, Nb 3.15%-4.15%, Ti 0.5%-1%, C<0.05%, Cu<0.5%, Fe<5%, Mn<0.5%, P<0.02%, S<0.015%, Si<0.5%, Al<0.4%, LaB6 0.25%-0.5%, rutile 1%-1.4%, MnO≤0.5%, feldspar 1%-2.8%, mullite 0.4%-1.0%, with the remainder being Ni.

3. The filament for arc additive manufacturing according to claim 1 or 2, characterized in that, The aforementioned drug coating is an Inconel 625 drug coating.

4. The filament for arc additive manufacturing according to claim 1 or 2, characterized in that, The diameter of the wire is 1.2 mm.

5. The method for preparing the filament for arc additive manufacturing according to claim 1 or 2, characterized in that, Includes the following steps: S1. Add the core powder and LaB6 nanoparticles to the ball mill container in proportion. After ball milling, dry the mixed powder. S2. After drying the coating material, roll it into a U-shaped coating. Then, add the mixed powder dried in step S1 into the U-shaped coating according to the above filling ratio. Then, draw the filament into the filament for arc additive manufacturing.

6. The preparation method according to claim 5, characterized in that, The drying conditions described in step S1 are: heating to 100°C and holding at that temperature for 1 hour.

7. The use of the arc additive manufacturing filament as described in claim 1 or 2 in the preparation of Inconel 625 arc additive manufacturing parts.

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