Arc wire and arc additive manufacturing method and equipment for regulating properties of high-strength steel

Abstract

The present invention discloses an arc fuse additive manufacturing method for regulating the performance of high-strength steel. 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; the above steps are repeated, and the formed deposition layer gradually descends along with the substrate and is immersed in the molten salt in the thermostatic container below, the temperature of the molten salt is 240℃-350℃, until the entire molded part is deposited. The advantages of the present invention are: it can promote the conversion of residual austenite at the boundary of austenite dendrites into fine bainite, the molded part is crack-free, the hardness and strength are improved, and good ductility and toughness are maintained.

Description

Technical Field

[0001] The present invention relates to the technical field of additive manufacturing of metal materials, 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 to other high-strength steels, HSLA steel is widely used in the automotive, marine resource development, and tool and mold industries due to its superior weldability, high strength, and high toughness. During the additive manufacturing process of high-strength steel, the microstructure and mechanical properties of the lap joint are often affected by multiple factors, including thermal cycling, cooling rate, and heat treatment. During thermal cycling, the material undergoes repeated heating and cooling. Due to the multiple layers of superimposed high-strength steel, the lap joint is subjected to multiple thermal shocks, leading to uneven phase transformation and grain coarsening, which in turn increases the difference in mechanical properties along different directions. Excessively rapid cooling rates inhibit the precipitation of beneficial phases in the lap joint, potentially skipping the intermediate temperature transformation region. This lack of ductile phases leads to localized stress concentrations, accelerating fatigue failure. Excessively rapid cooling can also delay gas escape, forming pores. Furthermore, solidification shrinkage stresses can easily induce microcracks. These factors lead to microstructural inhomogeneity and decreased mechanical properties in the lap joint. In particular, ductility in the deposition direction is often significantly lower than in the horizontal direction. Conventional additive manufacturing methods struggle to effectively control these microstructures and mechanical properties, limiting the application of high-strength steel additively manufactured parts in high-end manufacturing. Therefore, developing an arc-fuse additive manufacturing process that can control the microstructure and mechanical properties of the lap joints in additively manufactured high-strength steel is crucial. 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 surfaces of the cooling cavities are closely attached to the sides 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 cavities are separated from the deposition layer; then the workbench is controlled to continue to descend a certain distance; molten salt is introduced into the cooling cavities;

[0005] Repeat the above steps, and the formed deposition layer gradually descends along 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 entire molded part is deposited.

[0006] After the deposition is completed, immerse the entire formed part in the molten salt for 1 h - 2 h; take out the formed part and air-cool it to room temperature.

[0007] 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 falls back into the temperature-adjustable container.

[0008] 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.

[0009] 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.

[0010] Furthermore, the welding process adopted by the arc wire feeding additive manufacturing technology is one of gas metal arc welding, gas tungsten arc welding or plasma arc welding.

[0011] The present invention also discloses an arc wire feeding additive manufacturing device, including 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; the temperature-adjustable container is filled with molten salt; a circulating molten salt is introduced into the cooling cavities.

[0012] Furthermore, it further includes a high-temperature resistant circulating pump, one end of which 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.

[0013] 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 connected to the outlet pipe is located at the upper part.

[0014] 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; a threaded hole is provided at the other end 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 penetrates through the temperature-adjustable container; and the lead screw is driven to rotate by a braking motor and a transmission assembly.

[0015] Furthermore, cooling pipes are wound around the outside of several groups of the outer rods; a coolant is introduced into the cooling pipes.

[0016] Further, an installation plate is detachably installed on the inner wall of the temperature-adjustable container; the outer rod is detachably installed on the installation plate.

[0017] Further, the braking motor is installed on the support plate, and an installation frame is installed on the support plate; the lead screw is rotatably installed on the installation frame and the installation plate.

[0018] Beneficial effects of the present invention:

[0019] The present invention adopts an improved arc wire and arc additive manufacturing method. During additive manufacturing, double-sided clamping and cooling are carried out, and on-line salt bath treatment is performed, which 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, and at the same time, good ductility and toughness are maintained, 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.

[0020] 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 the arc wire and arc 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 high-strength steel additive manufactured parts in high-end manufacturing fields such as aerospace, automotive manufacturing, and energy. Description of the drawings

[0021] Figure 1 It is a microstructure distribution diagram of different regions of the upper, middle, and lower parts of the thin-walled parts in Example 3, Comparative Example 1, and Comparative Example 2;

[0022] Figure 2 It is the front view of the overall structure of Example 4;

[0023] Figure 3 It is the side view of the overall structure of Example 4;

[0024] Figure 4 For Figure 3 The enlarged view of the local structure in;

[0025] Figure 5 It is the top view of the local structure of Example 4.

[0026] 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 - installation plate, 13 - outer rod, 14 - inner rod, 15 - lead screw, 16 - transmission assembly, 17 - braking motor, 18 - support plate, 19 - installation frame, 20 - cooling pipe, 21 - cantilever. Detailed implementation manners

[0027] The specific implementation manners of the present invention will be further described below in conjunction with the accompanying drawings. It should be noted here that the description of these implementation manners is used to help understand the present invention, but does not constitute a limitation on the present invention. In addition, the technical features involved in the various implementation manners of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0028] Example 1

[0029] An arc wire - feeding additive manufacturing method for regulating the properties of high - strength steel includes the following steps:

[0030] S1. Select a substrate matching the wire material, remove the dirt and oxide layer on the surface of the substrate, preheat the substrate to a certain temperature and then install it on the workbench, and fill the welding wire into the arc wire - feeding additive manufacturing system;

[0031] S2. Model and layer - slice the formed part, plan the trajectory of arc wire - feeding forming, and import the generated data file into the system software of additive manufacturing;

[0032] S3. Start deposition according to the programmed path;

[0033] S4. After the first layer of deposition is completed, control the workbench to descend a certain distance; in this example, the distance of each descent is the layer thickness of the preset deposition layer;

[0034] S5. Then control the cooling cavities on both sides of the deposition layer to approach each other so that the outer surfaces of the cooling cavities are in close contact with the sides of the deposition layer; start the next - layer 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 cavities are separated from the deposition layer; then control the workbench to continue descending a certain distance; there is molten salt in the cooling cavities;

[0035] S6. Repeat step S5, and the formed deposition layer gradually descends with the substrate and is immersed in 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;

[0036] S7. After the deposition is completed, control the substrate to descend further and immerse the entire formed part in the molten salt for 1 h;

[0037] S8. Control the substrate to rise, take out the formed part, and air - cool it to room temperature.

[0038] Specifically, the molten salt in the adjustable - temperature container is pumped into the cooling cavities through a high - temperature - resistant circulation pump, and finally discharged through the outlet on the cooling cavity via the liquid outlet pipe and falls back into the adjustable - temperature container.

[0039] Specifically, during the deposition process, the moving speed of the welding torch is 200 mm / min, the welding voltage is 20 V, and the welding current is 150 A; the wire feeding speed is 5 m / min, and the argon gas flow rate is 5 L / min.

[0040] Specifically, 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.

[0041] 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 tungsten inert gas welding or plasma arc welding.

[0042] Example 2

[0043] For the arc wire - feeding additive manufacturing method for regulating the properties of high - strength steel, compared with Example 1, some parameters are modified. In S6, the temperature of the molten salt is 350 °C. In S7, after the deposition is completed, the entire formed part is immersed in the molten salt for 2 h. In step S3, during the deposition process, 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.

[0044] Example 3

[0045] For the arc wire - feeding additive manufacturing method for regulating the properties of high - strength steel, compared with Example 1, some parameters are modified. In S6, the temperature of the molten salt is 300 °C. In S7, after the deposition is completed, the entire formed part is immersed in the molten salt for 1.5 h. In step S3, during the deposition process, 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.

[0046] Comparative Example 1

[0047] An arc wire - feeding additive manufacturing method includes the following steps:

[0048] S1. Select a substrate that matches 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;

[0049] 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;

[0050] S3. Start deposition according to the programmed path;

[0051] S4. Whenever a layer is deposited, the workbench is controlled to descend by a certain distance, and the deposited layers descend layer by layer and are immersed in the molten salt in the adjustable-temperature container below. The temperature of the molten salt is 300 °C until the entire formed part is deposited;

[0052] S5. After deposition, the entire formed part is immersed in the molten salt for 1.5 h;

[0053] S6. Take out the formed part and air-cool it to room temperature.

[0054] Comparative Example 2

[0055] An arc wire additive manufacturing method includes the following steps:

[0056] S1. Select a substrate matching the wire material, remove the dirt and oxide layer on the substrate surface, preheat the substrate to a certain temperature and then fix it on the workbench, and fill the welding wire into the arc wire additive manufacturing system;

[0057] S2. Model and slice the formed part layer by layer, plan the trajectory of arc wire forming, and import the generated data file into the system software of additive manufacturing;

[0058] S3. Start deposition according to the programmed path;

[0059] S4. Whenever the first layer is deposited, the workbench is controlled to descend by a certain distance, and the deposited layers descend layer by layer until the entire formed part is deposited;

[0060] S5. Take out the formed part and air-cool it to room temperature.

[0061] Example 4

[0062] An arc wire additive manufacturing device, as Figure 2-5 shown, includes a liftable workbench 2, an adjustable-temperature 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 adjustable-temperature 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, so as to drive the workbench 2 to lift and lower. The adjustable-temperature 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 adjustable-temperature container 1.

[0063] 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 formed on the surface of the workbench 2, and the substrate 3 is clamped on the workbench 2 using clamping blocks. After the first layer is deposited, the workbench 2 is controlled to descend by a certain distance; in this embodiment, the distance of each descent is the layer thickness of the preset deposited layer. Then, the telescopic assembly 6 is controlled to extend, so that the cooling cavities 5 on both sides approach each other until the cooling cavities 5 are in close contact with the deposited layer 4. On the one hand, the cooling cavities 5 can cool the deposited layer 4, and on the other hand, an extrusion force can be applied 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 the mechanical properties is improved, the longitudinal samples show higher strength, and the transverse samples show higher elongation.

[0064] 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 achieve 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 a molten salt pump.

[0065] Specifically, the high-temperature resistant circulating pump 7 is connected to one of the cooling cavities 5, and a liquid outlet pipe is connected to one side of the other cooling cavity 5; the two cooling cavities 5 are connected 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 connected to 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 one 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.

[0066] Specifically, the telescopic component 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 penetrates through the temperature-adjustable container 1; and the lead screw 15 is driven to rotate by a braking motor 17 and a transmission component 16. The transmission component 16 can be a chain transmission component or a belt transmission component. In another embodiment, threaded holes can also be provided at one end of each group of inner rods 14, and each inner rod 14 is connected to the lead screw 15, and a plurality of lead screws 15 are connected by a chain transmission component.

[0067] Specifically, cooling pipes 20 are wound around the outside of a plurality of groups of outer rods 13; a coolant is passed through the cooling pipes 20. In this embodiment, the cooling pipes 20 on each outer rod 13 are communicated with each other. The cooling pipes 20 are communicated with a container for storing the coolant, and are communicated with a circulation pump and a refrigerator. By passing a circulating coolant through the cooling pipes 20, the outer rods 13 and the inner rods 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.

[0068] 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.

[0069] Specifically, the braking motor 17 is installed on a support plate 18, and a mounting bracket 19 is installed on the support plate 18; the lead screw 15 is rotatably installed on the mounting bracket 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.

[0070] In order to verify the technical effects of the embodiments, the following tests were carried out:

[0071] Test 1. Vickers hardness

[0072] Samples prepared in Example 1, Example 2, Example 3, Comparative Example 1, and Comparative Example 2 were taken. For each of 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:

[0073] 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

[0074] 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.

[0075] Test 2. Tensile properties

[0076] 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:

[0077]

[0078] 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 of 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 of the comparative examples, indicating that the difference in elongation in the transverse and longitudinal directions of Examples 1-3 is smaller.

[0079] Experiment 3: Microstructure

[0080] 1. Test process

[0081] 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 a 4% nitric acid ethanol solution (4% HNO3, 96% CH3CH2OH) for 10 s. Use a SEM (Hitachi S4800) scanning electron microscope to observe the microstructure of different parts and further analyze the microstructure changes of different samples.

[0082] 2. Test results

[0083] The microstructure distribution maps of different regions in the upper, middle, and lower parts of the samples of Example 3, Comparative Example 1, and Comparative Example 2 are as Figure 1 shown.

[0084] It can be seen from the microstructure diagrams of the upper, middle, and lower parts of Comparative Example 2 that there is a significant tissue gradient in the vertical direction. Coarse martensite is formed in the upper part near the surface layer due to rapid cooling, and austenite or coarse bainite that has not completely undergone a phase change remains in the middle part, resulting in serious mechanical property anisotropy. This is because the room-temperature cooling of Comparative Example 2 leads to a severe non-equilibrium phase change, forming high-hardness martensite, accompanied by high residual stress and the risk of microcracks, deteriorating the mechanical properties. The region dominated by high-brittle martensite is prone to brittle fracture, the elongation is significantly reduced, and the fatigue life is short.

[0085] 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. However, due to fluctuations in the local cooling rate, the grain size may be uneven, and coarse bainite or a small amount of martensite may appear 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, which only avoids the quenching effect of room-temperature cooling to a certain extent.

[0086] 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.

[0087] In summary, through the bilateral clamping cooling of the cooling cavity in combination with on-line salt bath treatment in Example 3, the refinement and homogenization of the microstructure are achieved, which is significantly superior to the traditional salt bath treatment and room-temperature cooling processes.

[0088] 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 to these embodiments still fall within the protection scope of the present invention.

Claims

1. An arc wire and arc additive manufacturing method for regulating the properties of high-strength steel, characterized in that: After the deposition of the first layer is completed, control the workbench to descend a certain distance; then control the cooling cavities on both sides of the deposition layer to approach each other, so that the outer surfaces of the cooling cavities are in close contact with the sides of the deposition layer; start the deposition of the next layer; 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 cavities are separated from the deposition layer; then control the workbench to continue to descend a certain distance; molten salt is introduced into the cooling cavities. Repeat the above steps. The formed deposition layer gradually descends with the substrate and is immersed in the molten salt in the adjustable-temperature container below. The temperature of the molten salt is 240°C - 350°C until the entire formed part is deposited. After the deposition is completed, immerse the entire formed part in the molten salt for 1h - 2h; take out the formed part and air-cool it to room temperature.

2. The arc wire feeding additive manufacturing method for regulating the properties of high-strength steel according to claim 1, wherein: During the deposition process, the moving speed of the welding torch is 200mm / min - 500mm / min, the welding voltage is 20V - 30V, and 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 method for arc wire additive manufacturing for regulating the properties of high-strength steel according to claim 1, characterized in that: 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 10mm - 20mm.

4. An arc wire additive manufacturing device for implementing the arc wire additive manufacturing method for regulating the properties of high-strength steel according to any one of claims 1-3 above, characterized in that: It includes a liftable workbench (2), an adjustable-temperature container (1) for placing and heating molten salt (10), cooling cavities (5) on both sides, and a telescopic component (6) for driving the movement of the cooling cavities (5); molten salt is placed in the adjustable-temperature container (1); circulating molten salt (10) is introduced into the cooling cavities (5).

5. The wire arc additive manufacturing equipment according to claim 4, characterized in that: 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 adjustable-temperature container (1) through a pipeline (11), and the other end is connected to the cooling cavity (5) through a high-temperature resistant hose.

6. The wire arc additive manufacturing equipment according to claim 5, characterized in that: The high-temperature resistant circulating pump (7) is connected to one of the cooling cavities (5). An outlet pipe is connected to one side of the other cooling cavity (5); the two cooling cavities (5) are connected through a high-temperature resistant hose; the interface of the cooling cavity (5) connected to the high-temperature resistant hose is located at the lower part, and the interface of the other cooling cavity (5) connected to the outlet pipe is located at the upper part.

7. The wire arc additive manufacturing device according to claim 4, characterized in that: The telescopic component (6) includes a plurality of outer rods (13) and square inner rods (14) slidably installed in the inner cavities of the outer rods (13); one end of the inner rod (14) is detachably connected to the cooling cavity (5); a threaded hole is opened at the other end of one group of inner rods (14); one end of a lead screw (15) is connected to the threaded hole of the inner rod (14), and the other end passes through the adjustable-temperature container (1); and the lead screw (15) is driven to rotate by a braking motor (17) and a transmission component (16).

8. The wire arc additive manufacturing equipment according to claim 7, characterized in that: Cooling pipes (20) are wound around the outside of several groups of the outer rods (13); coolant is introduced into the cooling pipes (20).

9. The wire arc additive manufacturing device according to claim 7, characterized in that: The inner wall of the adjustable-temperature container (1) is detachably installed with a mounting plate (12); the outer rods (13) are detachably installed on the mounting plate (12).

10. The arc wire feeding additive manufacturing equipment according to claim 9, characterized in that: The braking motor (17) is mounted on the support plate (18), and a mounting bracket (19) is mounted on the support plate (18); the lead screw (15) is rotatably mounted on the mounting bracket (19) and the mounting plate (12).

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