Electric arc fuse wire additive manufacturing method and equipment for regulating and controlling performance of high-strength steel

Abstract

The invention discloses an electric arc fuse wire additive manufacturing method for regulating and controlling the performance of high-strength steel, which comprises the following steps: after the deposition of a first layer is completed, controlling a workbench to descend for a certain distance; then the cooling cavities on the two sides of the deposition layer are controlled to be close to each other, and the outer surfaces of the cooling cavities are tightly attached to the side face of the deposition layer; next layer deposition is started; after deposition is finished, the cooling cavities on the two sides of the deposition layer are controlled to be away from each other, so that the cooling cavities are separated from the deposition layer; then the workbench is controlled to continuously descend by a certain distance; fused salt is introduced into the cooling cavity; and the steps are repeated, the formed deposition layer gradually descends along with the substrate and is immersed into the fused salt in the temperature-adjustable container below, and the temperature of the fused salt is 240-350 DEG C until the deposition of the whole formed part is completed. The method has the advantages that residual austenite at the austenite dendritic crystal boundary can be promoted to be converted into fine bainite, a formed part is free of cracks, the hardness and strength are improved, and meanwhile good ductility and toughness are kept.

Description

Technical Field

[0001] The invention relates to the technical field of metal material additive manufacturing, and in particular to an arc fuse additive manufacturing method for regulating the performance of high-strength steel. Background Art

[0002] High-strength low-alloy (HSLA) steel is a structural material. Compared with other high-strength steels, HSLA steel is widely used in the fields of automobiles, marine resource development engineering, tools and molds due to its excellent weldability, high strength and high toughness. In the process of additive manufacturing of high-strength steel, the microstructure and mechanical properties of the overlap zone are often affected by multiple factors such as thermal cycle, cooling rate and heat treatment process. During the thermal cycle, the material will undergo repeated heating and cooling. The overlap zone of high-strength steel will be subjected to multiple thermal shocks due to the superposition of multiple layers, resulting in uneven phase transformation and grain coarsening, which will increase the difference in mechanical properties in different directions. Too fast cooling rate will inhibit the precipitation of beneficial phases in the overlap zone, may skip the medium-temperature transformation zone, lack of toughness phase, and the difference in structure will cause local stress concentration, thereby accelerating fatigue failure. Too fast cooling may also prevent the gas from escaping in time, forming pores, and solidification shrinkage stress is easy to induce microcracks. These factors lead to problems such as uneven structure and decreased mechanical properties in the overlap zone, especially in the deposition direction, where ductility is often significantly lower than in the horizontal direction. Traditional additive manufacturing methods are difficult to effectively control these microstructures and mechanical properties, which limits the application of high-strength steel additive manufacturing parts in the field of high-end manufacturing. Therefore, it is very important to develop an arc fuse additive manufacturing process that can control the microstructure and mechanical properties of the overlap zone of additively manufactured high-strength steel. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide an arc fuse additive manufacturing method for regulating the performance of high-strength steel, which can improve the hardness and strength of the molded parts while maintaining good ductility and toughness.

[0004] In order to solve the above technical problems, the present invention discloses an arc fuse additive manufacturing method for regulating the performance of high-strength steel. After the first layer of deposition is completed, the workbench is controlled to descend a certain distance; then the cooling cavities on both sides of the deposition layer are controlled to approach each other so that the outer surface of the cooling cavity is close to the side of the deposition layer; the next layer of deposition is started; after the deposition is completed, the cooling cavities on both sides of the deposition layer are controlled to move away from each other so that the cooling cavity is separated from the deposition layer; then the workbench is controlled to continue to descend a certain distance; molten salt is introduced into the cooling cavity; Repeat the above steps, the formed deposition layer gradually descends with the substrate and is immersed in the molten salt in the temperature-adjustable container below, the temperature of the molten salt is 240℃-350℃, until the deposition of the entire molded part is completed; After the deposition is completed, the entire molded part is immersed in the molten salt for 1h-2h; the molded part is taken out and air-cooled to room temperature.

[0005] Furthermore, the molten salt in the temperature-adjustable container is pumped into the cooling cavity through a high-temperature-resistant circulating pump, and finally discharged through the outlet on the cooling cavity via a liquid outlet pipe and then falls back into the temperature-adjustable container.

[0006] Furthermore, during the deposition process, the moving speed of the welding torch is 200 mm / min - 500 mm / min, the welding voltage is 20 V - 30 V, and the welding current is 150 A - 300 A; the wire feeding speed is 5 m / min - 7 m / min, and the argon gas flow rate is 5 L / min - 7 L / min.

[0007] Furthermore, the distance between the lower surface of the current deposition layer and the liquid level of the molten salt in the temperature-adjustable container is 10 mm - 20 mm.

[0008] Furthermore, the welding process adopted by the arc wire additive manufacturing technology is one of gas metal arc welding, gas tungsten arc welding or plasma arc welding.

[0009] The present invention also discloses an arc wire additive manufacturing device, which includes a liftable workbench, a temperature-adjustable container for placing and heating molten salt, cooling cavities on both sides, and a telescopic assembly for driving the movement of the cooling cavities; molten salt is placed in the temperature-adjustable container; circulating molten salt is introduced into the cooling cavities.

[0010] Furthermore, it also includes a high-temperature-resistant circulating pump. One end of the high-temperature-resistant circulating pump extends into the molten salt placed in the temperature-adjustable container through a pipeline, and the other end is connected to the cooling cavity through a high-temperature-resistant hose.

[0011] Furthermore, the high-temperature-resistant circulating pump is connected to one of the cooling cavities, and an outlet pipe is connected to one side of the other cooling cavity; the two cooling cavities are connected through a high-temperature-resistant hose; the interface of the cooling cavity connected to the high-temperature-resistant circulating pump for connecting the high-temperature-resistant hose is located at the lower part, and the interface of the other cooling cavity for connecting the outlet pipe is located at the upper part.

[0012] Furthermore, the telescopic assembly includes a plurality of outer rods and square inner rods slidably installed in the inner cavities of the outer rods; one end of the inner rod is detachably connected to the cooling cavity; threaded holes are provided at the other ends of one group of inner rods; one end of a lead screw is connected to the threaded hole of the inner rod, and the other end passes through the temperature-adjustable container; and the lead screw is driven to rotate by a braking motor and a transmission assembly.

[0013] Furthermore, cooling pipes are wound around the outside of several groups of the outer rods; coolant is introduced into the cooling pipes.

[0014] Furthermore, a mounting plate is detachably installed on the inner wall of the temperature-adjustable container; the outer rods are detachably installed on the mounting plate.

[0015] Further, the braking motor is installed on a support plate, and a mounting bracket is installed on the support plate; the lead screw is rotatably installed on the mounting bracket and the mounting plate.

[0016] Advantages of the present invention: The present invention adopts an improved arc wire feeding additive manufacturing method, which performs double-sided clamping and cooling during additive manufacturing and online salt bath treatment, can reduce the influence of the heat input of the previous layer, promote the transformation of retained austenite at the austenite dendrite boundary into fine bainite, the formed part has no cracks, the hardness and strength are improved, while maintaining good ductility and toughness, the interlayer bonding effect is good, the uniformity of mechanical properties is improved, the longitudinal sample shows higher strength, and the transverse sample shows higher elongation.

[0017] The process of the present invention is simple and easy to operate, can realize the homogenization of the microstructure, improve the tissue stability, provides new ideas and methods for arc wire feeding additive manufacturing of bainitic steel thin-walled structures, can manufacture complex formed parts with excellent mechanical properties and crack resistance, and meets the requirements of the mechanical properties of additive manufactured parts of high-strength steel in high-end manufacturing fields such as aerospace, automotive manufacturing, and energy. Description of the drawings

[0018] Figure 1 Microstructure distribution diagrams of different regions of the upper, middle, and lower parts of the thin-walled parts of Example 3, Comparative Example 1, and Comparative Example 2; Figure 2 Front view of the overall structure of Example 4; Figure 3 Side view of the overall structure of Example 4; Figure 4 For Figure 3 Enlarged view of the local structure in; Figure 5 Top view of the local structure of Example 4.

[0019] In the figure, 1 - temperature-adjustable container, 2 - workbench, 3 - substrate, 4 - deposition layer, 5 - cooling cavity, 6 - telescopic assembly, 7 - high-temperature resistant circulating pump, 8 - temperature measuring gun, 9 - welding torch, 10 - molten salt, 11 - pipeline, 12 - mounting plate, 13 - outer rod, 14 - inner rod, 15 - lead screw, 16 - transmission assembly, 17 - braking motor, 18 - support plate, 19 - mounting bracket, 20 - cooling pipe, 21 - cantilever. Specific embodiments

[0020] The following further describes the specific embodiments of the present invention with reference to the drawings. It should be noted here that the description of these embodiments is for helping to understand the present invention, but does not constitute a limitation to the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0021] Example 1 An arc wire - feeding additive manufacturing method for regulating the properties of high - strength steel, comprising the following steps: S1. Select a substrate that matches the wire material, remove the dirt and oxide layer on the substrate surface, preheat the substrate to a certain temperature, then install it on the workbench, and fill the welding wire into the arc wire - feeding additive manufacturing system; S2. Model and slice the formed part layer - by - layer, plan the arc wire - feeding forming trajectory, and import the generated data file into the system software of the additive manufacturing; S3. Start deposition according to the programmed path; S4. When the first layer of deposition is completed, control the workbench to descend a certain distance; in this embodiment, the distance of each descent is the layer thickness of the preset deposition layer; S5. Then control the cooling cavities on both sides of the deposition layer to approach each other, so that the outer surface of the cooling cavity is in close contact with the side surface of the deposition layer; start the next layer of deposition; after the deposition is completed, control the cooling cavities on both sides of the deposition layer to move away from each other, so that the cooling cavity disengages from the deposition layer; then control the workbench to continue to descend a certain distance; molten salt is introduced into the cooling cavity; S6. Repeat step S5, and the formed deposition layer gradually descends with the substrate and immerses into the molten salt in the adjustable - temperature container below. The temperature of the molten salt is 240 °C until the entire formed part is deposited; S7. After the deposition is completed, control the substrate to descend further, immerse the entire formed part into the molten salt for 1 h; S8. Control the substrate to rise, take out the formed part, and air - cool it to room temperature.

[0022] Specifically, the molten salt in the adjustable - temperature container is pumped into the cooling cavity by a high - temperature - resistant circulating pump, and finally discharged through the outlet on the cooling cavity via the liquid outlet pipe and falls back into the adjustable - temperature container.

[0023] Specifically, during the deposition process, the moving speed of the welding torch is 200 mm / min, the welding voltage is 20 V, the welding current is 150 A; the wire - feeding speed is 5 m / min, and the argon gas flow rate is 5 L / min.

[0024] Specifically, the distance between the lower surface of the current deposition layer and the liquid level of the molten salt in the adjustable - temperature container is 10 mm.

[0025] Specifically, the welding process adopted by the arc wire - feeding additive manufacturing technology is gas metal arc welding. In another embodiment, the welding process can also be gas tungsten arc welding or plasma arc welding.

[0026] Example 2 An arc wire - feeding additive manufacturing method for regulating the properties of high - strength steel, compared with Example 1, modifies some parameters. The temperature of the molten salt in S6 is 350 °C. In S7, after deposition, the entire formed part is immersed in the molten salt for 2 h; in step S3 during deposition, the moving speed of the welding torch is 500 mm / min, the welding voltage is 30 V, and the welding current is 300 A; the wire - feeding speed is 7 m / min, and the argon gas flow rate is 7 L / min. Initially in step S3, the distance between the upper surface of the substrate and the liquid level of the molten salt is 20 mm.

[0027] Example 3 An arc wire - feeding additive manufacturing method for regulating the properties of high - strength steel, compared with Example 1, modifies some parameters. The temperature of the molten salt in S6 is 300 °C. In S7, after deposition, the entire formed part is immersed in the molten salt for 1.5 h; in step S3 during deposition, the moving speed of the welding torch is 340 mm / min, the welding voltage is 26 V, and the welding current is 230 A; the wire - feeding speed is 6 m / min, and the argon gas flow rate is 6 L / min. Initially in step S3, the distance between the upper surface of the substrate and the liquid level of the molten salt is 15 mm.

[0028] Comparative Example 1 An arc wire - feeding additive manufacturing method includes the following steps: S1. Select a substrate matching the wire material, remove the dirt and oxide layer on the substrate surface, pre - heat the substrate to a certain temperature and then fix it on the workbench, and fill the welding wire into the arc wire - feeding additive manufacturing system; S2. Model and slice the formed part layer - by - layer, plan the arc wire - feeding forming trajectory, and import the generated data file into the system software of the additive manufacturing; S3. Start deposition according to the programmed path; S4. Whenever a layer is deposited, control the workbench to descend a certain distance. The deposited layers descend layer - by - layer and are immersed in the molten salt in an adjustable - temperature container below. The temperature of the molten salt is 300 °C until the entire formed part is deposited; S5. After deposition, immerse the entire formed part in the molten salt for 1.5 h; S6. Take out the formed part and air - cool it to room temperature.

[0029] Comparative Example 2 An arc wire - feeding additive manufacturing method includes the following steps: S1. Select a substrate matching the wire material, remove the dirt and oxide layer on the substrate surface, pre - heat the substrate to a certain temperature and then fix it on the workbench, and fill the welding wire into the arc wire - feeding additive manufacturing system; S2. Model and slice the formed part layer - by - layer, plan the arc wire - feeding forming trajectory, and import the generated data file into the system software of the additive manufacturing; S3. Start deposition according to the programmed path; S4. Whenever the first layer of deposition is completed, control the workbench to descend by a certain distance. The deposited layers descend layer by layer until the entire formed part is deposited; S5. Take out the formed part and air-cool it to room temperature.

[0030] Example 4 An arc wire additive manufacturing device, as Figure 2-5 shown, includes a liftable workbench 2, a temperature-adjustable container 1 for placing and heating molten salt 10, cooling cavities 5 on both sides, and a telescopic assembly 6 for driving the movement of the cooling cavities 5; the temperature-adjustable container 1 contains molten salt 10; circulating molten salt 10 is introduced into the cooling cavities 5. A cantilever 21 is fixedly connected to the side of the workbench 2 and is installed on a liftable platform or device through the cantilever 21, thereby driving the workbench 2 to lift. The temperature-adjustable container 1 can be an electric heating container using PID regulation. The temperature of the molten salt 10 can be controlled to be maintained within a set temperature range through the temperature-adjustable container 1.

[0031] During operation, the cleaned substrate 3 is installed on the workbench 2. The substrate 3 and the workbench 2 can be connected by studs, or grooves can be opened on the surface of the workbench 2, and the substrate 3 can be clamped on the workbench 2 using clamping blocks. When the first layer of deposition is completed, control the workbench 2 to descend by a certain distance; in this embodiment, the distance of each descent is the layer thickness of the preset deposited layer. Then control the telescopic assembly 6 to extend, so that the cooling cavities 5 on both sides approach each other until the cooling cavities 5 are close to the deposited layer 4. On the one hand, the cooling cavities 5 can cool down the deposited layer 4, and on the other hand, they can apply an extrusion force to extrude the deposited layer to a certain extent, which helps to close pores, heal cracks, and redistribute inclusions, thereby improving the density and uniformity of the material. While depositing, the deposited layer 4 gradually descends until the deposited layer 4 gradually descends into the molten salt 10 in the temperature-adjustable container 1. The combination of double-sided clamping cooling and on-line salt bath treatment can reduce the influence of the heat input of the previous layer, promote the transformation of the retained austenite at the austenite dendrite boundary into fine bainite, the formed part has no cracks, the hardness and strength are improved, while maintaining good ductility and toughness, the interlayer bonding effect is good, the uniformity of mechanical properties is improved, the longitudinal samples show higher strength, and the transverse samples show higher elongation.

[0032] Specifically, it further includes a high-temperature resistant circulating pump 7. One end of the high-temperature resistant circulating pump 7 extends into the molten salt 10 placed in the temperature-adjustable container 1 through a pipeline 11, and the other end is connected to the cooling cavity 5 through a high-temperature resistant hose. The use of the high-temperature resistant circulating pump 7 can realize the circulation of the molten salt 10 in the temperature-adjustable container 1 and the cooling cavity 5. In this embodiment, the high-temperature resistant circulating pump 7 is selected as a molten salt pump.

[0033] Specifically, the high-temperature resistant circulating pump 7 communicates with the cooling cavity 5 on one side, and a liquid outlet pipe is connected to one side of the other cooling cavity 5; the two cooling cavities 5 are communicated through a high-temperature resistant hose; the interface of the cooling cavity 5 connected to the high-temperature resistant circulating pump 7 for connecting the high-temperature resistant hose is located at the lower part, and the interface of the other cooling cavity 5 for connecting the liquid outlet pipe is located at the upper part. In another embodiment, two high-temperature resistant circulating pumps 7 can also be respectively connected to the lower part of a cooling cavity 5, the high-temperature resistant hose connecting the two cooling cavities 5 in this embodiment is cancelled, and liquid outlet pipes are installed at the upper part of each cooling cavity 5.

[0034] Specifically, the telescopic assembly 6 includes a plurality of outer rods 13 and a square inner rod 14 slidably installed in the inner cavity of the outer rod 13; one end of the inner rod 14 is detachably connected to the cooling cavity 5; a threaded hole is provided at the other end of one group of inner rods 14; one end of the lead screw 15 is connected to the threaded hole of the inner rod 14, and the other end passes through the temperature-adjustable container 1; and the lead screw 15 is driven to rotate by a braking motor 17 and a transmission assembly 16. The transmission assembly 16 can be a chain transmission assembly or a belt transmission assembly. In another embodiment, threaded holes can also be provided at one end of each group of inner rods 14, each inner rod 14 is connected to the lead screw 15, and a plurality of lead screws 15 are connected through a chain transmission assembly.

[0035] Specifically, a cooling pipe 20 is wound around the outside of a plurality of groups of outer rods 13; a coolant is introduced into the cooling pipe 20. In this embodiment, the cooling pipes 20 on each outer rod 13 are communicated with each other. The cooling pipe 20 is communicated with a container for storing the coolant, and is communicated with a circulating pump and a refrigerator. By introducing a circulating coolant into the cooling pipe 20, the outer rod 13 and the inner rod 14 can be cooled. In another embodiment, the cooling pipes 20 on each outer rod 13 are not communicated with each other and are independent of each other.

[0036] Specifically, for the convenience of installation and maintenance, a mounting plate 12 is detachably installed on the inner wall of the temperature-adjustable container 1; the outer rod 13 is detachably installed on the mounting plate 12.

[0037] Specifically, the braking motor 17 is installed on the support plate 18, and a mounting frame 19 is installed on the support plate 18; the lead screw 15 is rotatably installed on the mounting frame 19 and the mounting plate 12 through bearings. The support plate 18 is fixedly arranged, and the support plate 18 can be supported and fixed by other objects.

[0038] In order to verify the technical effects of the embodiments, the following tests were carried out: Test 1, Vickers hardness Samples prepared in Example 1, Example 2, Example 3, Comparative Example 1, and Comparative Example 2 were taken. For the five processes, 3 samples were taken for each process, and the Vickers hardness of the upper, middle, and lower parts of all samples was measured, and then the average value was calculated. The results are as follows: Hardness (HV) Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Upper part 386.2 369.7 378.1 329.2 317.6 Middle part 371.6 350.5 363.2 303.6 308.2 Lower part 373.1 353.4 367.4 305.0 297.2 As can be seen from the above table, the hardness of the upper, middle, and lower parts of the samples in Examples 1-3 is significantly improved compared with those in Comparative Examples 1 and 2.

[0039] Experiment 2: Tensile properties Take a number of specimens prepared in Example 1, Example 2, Example 3, Comparative Example 1, and Comparative Example 2. For 5 processes, take 3 longitudinal samples and 3 transverse samples for each process. Conduct tensile tests on all samples, calculate the average yield strength, ultimate tensile strength, and elongation corresponding to the five processes, and calculate the elongation ratio of the longitudinal samples to the transverse samples. The results are as follows: It can be seen that the yield strength and ultimate tensile strength of the transverse and longitudinal samples in Examples 1-3 are improved to a certain extent compared with those in the comparative examples, and at the same time, the elongation does not decrease significantly. Moreover, the elongation ratio of the transverse and longitudinal samples in Examples 1-3 is larger than that in the comparative examples, indicating that the difference in elongation in the transverse and longitudinal directions in Examples 1-3 is smaller.

[0040] Experiment 3: Microstructure 1. Test process Use the standard metallographic preparation method to prepare samples for microstructure characterization of Example 3, Comparative Example 1, and Comparative Example 2 respectively. The samples are etched with 4% nitric acid ethanol solution (4% HNO 3 , 96% CH 3 CH 2 OH) for 10 s. Use SEM (Hitachi S4800) scanning electron microscope to observe the microstructure of different parts, and further analyze the microstructure changes of different samples.

[0041] 2. Test results The microstructure distribution maps of the upper, middle, and lower parts of the samples in Example 3, Comparative Example 1, and Comparative Example 2 are as Figure 1 shown.

[0042] From the microstructure diagrams of the upper, middle, and lower parts of Comparative Example 2, it can be seen that there is a significant tissue gradient in the vertical direction. In the upper part near the surface layer, coarse martensite is formed due to rapid cooling, and in the middle part, there are residual austenite or coarse bainite that have not completely undergone phase transformation, resulting in severe mechanical property anisotropy. This is because the room temperature cooling in Comparative Example 2 leads to severe non-equilibrium phase transformation, forming high-hardness martensite, accompanied by high residual stress and the risk of microcracks, the mechanical properties deteriorate, brittle fracture is prone to occur in the region dominated by high-brittle martensite, the elongation is significantly reduced, and the fatigue life is short.

[0043] It can be seen from the microstructural diagrams of the upper, middle, and lower parts of Comparative Example 1 that bainite is generated during the isothermal process, but the grain size may be uneven due to fluctuations in the local cooling rate, and coarse bainite or a small amount of martensite appears in some areas. This is because after the deposition layer in Comparative Example 1 was just deposited, it first underwent rapid room-temperature cooling and then salt bath treatment. There is still a certain temperature gradient in the vertical direction, only avoiding the quenching effect of room-temperature cooling to a certain extent.

[0044] The microstructure of the upper, middle, and lower parts of Example 3 is more uniform than that of Comparative Example 1 and Comparative Example 2. Through the design of the cooling cavity, the thermal field distribution is significantly optimized, and the temperature gradient in the vertical direction is reduced. The bilateral clamping cooling of the cooling cavity in combination with on-line salt bath treatment can promote the formation of phase transformation structures such as bainite in a more uniform temperature field, allow sufficient diffusion phase transformation, form fine bainite, and at the same time inhibit the formation of coarse martensite or retained austenite, significantly improving the strength-ductility matching. The grain size and phase composition differences in different regions in the vertical direction are small, the tensile strength, elongation, and fatigue performance are stable, and the residual stress is low.

[0045] In summary, Example 3 realizes the refinement and homogenization of the microstructure through the bilateral clamping cooling of the cooling cavity in combination with on-line salt bath treatment, which is significantly superior to the traditional salt bath treatment and room-temperature cooling processes.

[0046] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. For those skilled in the art, without departing from the principle and spirit of the present invention, various changes, modifications, substitutions, and variations made to these embodiments still fall within the protection scope of the present invention.

Claims

1. An arc fuse additive manufacturing method for regulating the performance of high-strength steel, characterized in that: When the first layer of deposition is completed, the workbench is controlled to descend a certain distance; then the cooling cavities on both sides of the deposition layer are controlled to approach each other so that the outer surface of the cooling cavity is close to the side of the deposition layer; the next layer of deposition begins; after the deposition is completed, the cooling cavities on both sides of the deposition layer are controlled to move away from each other so that the cooling cavity is separated from the deposition layer; then the workbench is controlled to continue to descend a certain distance; molten salt is introduced into the cooling cavity; Repeat the above steps, the formed deposition layer gradually descends with the substrate and is immersed in the molten salt in the temperature-adjustable container below, the temperature of the molten salt is 240℃-350℃, until the deposition of the entire molded part is completed; After the deposition is completed, the entire molded part is immersed in the molten salt for 1h-2h; the molded part is taken out and air-cooled to room temperature.

2. The arc fuse additive manufacturing method for regulating high-strength steel performance according to claim 1, characterized in that: During the deposition process, the welding gun moving speed is 200mm / min-500mm / min, the welding voltage is 20V-30V, the welding current is 150A-300A; the wire feeding speed is 5m / min-7m / min, and the argon gas flow rate is 5L / min-7L / min.

3. The arc fuse additive manufacturing method for regulating high-strength steel performance according to claim 1, characterized in that: The distance between the lower surface of the current sedimentation layer and the liquid surface of the molten salt in the thermostatic container is 10 mm-20 mm.

4. An arc fuse additive manufacturing device for realizing the arc fuse additive manufacturing method for regulating the performance of high-strength steel as described in any one of claims 1 to 3, characterized in that: The invention comprises a liftable workbench (2), a temperature-adjustable container (1) for placing and heating molten salt (10), cooling cavities (5) on both sides, and a telescopic component (6) for driving the cooling cavity (5) to move; molten salt is placed in the temperature-adjustable container (1); and circulating molten salt (10) is introduced into the cooling cavity (5).

5. The arc fuse additive manufacturing device according to claim 4, characterized in that: It also includes a high temperature resistant circulation pump (7), one end of which extends through a pipeline (11) into the molten salt (10) placed in the temperature-adjustable container (1), and the other end of which is connected to the cooling cavity (5) through a high temperature resistant hose.

6. The arc fuse additive manufacturing device according to claim 5, characterized in that: The high temperature resistant circulation pump (7) is connected to the cooling cavity (5) on one side, and a liquid outlet pipe is connected to one side of the other cooling cavity (5); the two cooling cavities (5) are connected via a high temperature resistant hose; the interface of the cooling cavity (5) connected to the high temperature resistant circulation pump (7) connected to the high temperature resistant hose is located at the bottom, and the interface of the other cooling cavity (5) connected to the liquid outlet pipe is located at the top.

7. The arc fuse additive manufacturing device according to claim 4, characterized in that: The telescopic assembly (6) comprises a plurality of outer rods (13) and a square inner rod (14) slidably mounted in the inner cavity of the outer rod (13); one end of the inner rod (14) is detachably connected to the cooling cavity (5); a threaded hole is formed at the other end of one group of the inner rods (14); one end of a screw rod (15) is connected to the threaded hole of the inner rod (14), and the other end passes through the temperature-adjustable container (1); and the screw rod (15) is driven to rotate via a brake motor (17) and a transmission assembly (16).

8. The arc fuse additive manufacturing device according to claim 7, characterized in that: A cooling tube (20) is wound around the outside of each of the groups of outer rods (13); a cooling liquid is passed through the cooling tube (20).

9. The arc fuse additive manufacturing device according to claim 7, characterized in that: A mounting plate (12) is detachably mounted on the inner wall of the temperature-adjustable container (1); and the outer rod (13) is detachably mounted on the mounting plate (12).

10. The arc fuse additive manufacturing device according to claim 9, characterized in that: The brake motor (17) is mounted on a support plate (18), and a mounting frame (19) is mounted on the support plate (18); the screw rod (15) is rotatably mounted on the mounting frame (19) and the mounting plate (12).

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