Heat treatment method for cold metal transition electric arc additive manufacturing of GW63K magnesium alloy and alloy product

Abstract

The invention provides a heat treatment method for cold metal transition electric arc additive manufacturing of GW63K magnesium alloy and an alloy product. The prepared GW63K magnesium alloy sample is cut and cleaned and then put into a heat treatment furnace for heat preservation; after heat preservation is finished, the GW63K magnesium alloy is taken out and subjected to water-cooling quenching; the quenched GW63K magnesium alloy is put into a low-temperature heat treatment furnace for low-temperature long-time heat preservation; according to the method, a water cooling mode is adopted, high-temperature short-time solid solution and low-temperature long-time aging are combined, effective solid solution of a grain boundary eutectic phase is achieved, a large number of beta'nanometer strengthening phases are separated out, the structure of the GW63K magnesium alloy is effectively improved, and the strength is greatly improved while the plasticity and hardness of the obtained material are met; the problem that the 3D printing rare earth magnesium alloy is poor in strength is solved, the solid solution strengthening and aging strengthening effects are effectively achieved, and the tensile strength of the GW63K magnesium alloy is improved.

Description

Technical Field

[0001] The invention belongs to a technical method for heat treatment of metal materials, and specifically relates to a heat treatment method for cold metal transition arc additive manufacturing of GW63K magnesium alloy. Background Art

[0002] Lightweight rare earth magnesium alloys (Mg-RE) are gaining increasing attention in the automotive, aerospace, and aircraft sectors because of the excellent properties that can be achieved through customized heat treatment schemes. Moreover, the aforementioned advanced equipment manufacturing industries attach great importance to the development of large-size, monolithic lightweight components. However, due to the special hexagonal close-packed (HCP) crystal structure of Mg-RE alloys, their machinability at room temperature is poor. Therefore, there is a great need to shift the research focus to the emerging additive manufacturing (AM) process, which is known for its ability to manufacture components with complex geometries.

[0003] So far, some studies have successfully applied the wire arc additive manufacturing (WAAM) process to the preparation of Mg-RE alloy parts. However, the yield strength and elongation of Mg-RE alloys prepared by the reported wire arc additive manufacturing method are limited to 200-220 MPa and 2%-7%, respectively. In addition, the effects of different heat treatment parameters on the type and precipitation behavior of nanoprecipitates in Mg-RE alloys have not been clearly understood.

[0004] Therefore, it is necessary to develop a heat treatment method suitable for arc additive manufacturing of Mg-RE alloys to improve the age hardening ability and strength. Summary of the invention

[0005] Purpose of the invention: The purpose of the present invention is to provide a heat treatment method and alloy product of GW63K magnesium alloy manufactured by cold metal transition arc additive manufacturing.

[0006] Technical solution: The first aspect of the present invention provides a heat treatment method for cold metal transfer arc additive GW63K magnesium alloy, that is, a heat treatment method for cold metal transfer-wire arc additive manufacturing (CMT-WAAM) GW63K magnesium alloy, comprising the following steps: (1) Preparation of GW63K magnesium alloy samples based on CMT-WAAM technology; (2) The GW63K magnesium alloy thin-walled samples prepared by CMT-WAAM technology were cut using wire-cut electric discharge technology, and the sample surface was cleaned after cutting to remove surface oil and oxides; (3) Set the temperature of the heat treatment furnace, increase the temperature, and use a high-sensitivity thermocouple to test the actual temperature of the furnace chamber to ensure that the actual temperature is the preset temperature; (4) placing the GW63K magnesium alloy sample in step (2) in the center of the heat treatment furnace chamber after the temperature is raised in step (3) for heat treatment, keeping the temperature and timing; (5) After the insulation is completed, the GW63K magnesium alloy is quickly taken out of the furnace chamber and placed in cold water for quenching; (6) Drying the surface of the GW63K magnesium alloy after quenching treatment, placing it in the center of the furnace chamber of a low-temperature heat treatment furnace for heat treatment, keeping the temperature and timing; In the step (3), the preset temperature is 400-450°C; In the step (6), the preset temperature of the low temperature heat treatment furnace is 200±35°C, and the holding time is 6-144 h.

[0007] As a preferred embodiment of the present invention, the GW63K magnesium alloy sample in step (1) is a high-strength, heat-resistant magnesium alloy with extremely high aging strengthening effect. The main alloying elements are gadolinium (Gd), yttrium (Y), and zirconium (Zr), and it belongs to the Mg-Gd-Y heavy rare earth magnesium alloy. The preparation method is: preheating the substrate to 120-200°C, using argon as a protective gas, and annealing the test block at 150-200°C for 2-5 hours after printing.

[0008] As a preferred embodiment of the present invention, in step (2), the sample after wire cutting is polished with 400# sandpaper, and then placed in an acetone solution and cleaned with an ultrasonic cleaner to remove surface oil and oxides.

[0009] As a preferred embodiment of the present invention, in step (3), the heat treatment furnace is selected from one or more of a vacuum tube furnace and an atmosphere protection furnace.

[0010] As a preferred embodiment of the present invention, in step (3), the preset temperature is set to 450°C.

[0011] As a preferred embodiment of the present invention, in step (4), the insulation time is 120±5 min.

[0012] As a preferred embodiment of the present invention, in step (5), the cooling method is water cooling with a relatively fast cooling speed, and the medium is high-purity distilled water.

[0013] As a preferred embodiment of the present invention, in step (6), the aging temperature of the heat treatment of the GW63K magnesium alloy is 200° C., and the holding time is 96 h.

[0014] A second aspect of the present invention is to provide an alloy product.

[0015] Compared with the prior art, the present invention has the following beneficial effects: The present invention adopts a water-cooling cooling method, a high-temperature short-time solid solution and a low-temperature long-time aging combination, so that the grain boundary eutectic phase is effectively dissolved and a large amount of β' nano-reinforced phase is precipitated, which effectively improves the GW63K magnesium alloy structure. Therefore, the obtained material has greatly improved strength while meeting the plasticity and hardness requirements; thereby solving the problem of poor strength of 3D printed rare earth magnesium alloys, effectively playing the role of solid solution strengthening and aging strengthening, and improving the tensile strength of the GW63K magnesium alloy. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic diagram of the process of preparing GW63K magnesium alloy using the CMT-WAAM technology of the present invention; Figure 2 Metallographic morphology of heat treatment of GW63K magnesium alloy prepared by CMT-WAAM technology in the embodiments of the present invention (in the figures, (a) corresponds to Embodiment 2, (b) corresponds to Embodiment 3, (c) corresponds to Embodiment 1, (d) corresponds to Embodiment 4, (e) corresponds to Embodiment 5, and (f) corresponds to Embodiment 6); Figure 3 An aging hardening curve diagram of aging heat treatment of GW63K magnesium alloy prepared by CMT-WAAM technology in Example 1 of the present invention; Figure 4 Transmission electron microscopy images of the heat-treated GW63K magnesium alloy prepared by the CMT-WAAM technology in Example 1 of the present invention (in the figure, (a) TEM image of β′ phase; (b) HAADF image of β′ phase and corresponding EDS images of Mg, Gd, Y, and Zr elements; (c) SAED pattern of the matrix; (d) HR-TEM image and FFT of nanoprecipitates and (e) size distribution of nanoprecipitates); Figure 5 This is a diagram of the room temperature tensile results obtained by the heat treatment method for preparing GW63K magnesium alloy using the CMT-WAAM technology according to Example 1 of the present invention (in the figure, (a) is a room temperature tensile curve diagram, and (b) is a room temperature tensile data diagram). DETAILED DESCRIPTION

[0017] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be further described below.

[0018] Example 1

[0019] The heat treatment method for preparing GW63K magnesium alloy based on CMT-WAAM technology in this embodiment includes the following steps: (1) Preparation of GW63K magnesium alloy samples using CMT-WAAM technology. The wire material is GW63K magnesium alloy wire with a diameter of 1.2 mm provided by the Magnesium and Magnesium Alloy Research Institute of Baosteel Metal Co., Ltd. The CMT-WAAM equipment is the S1 Adv additive manufacturing system of ENIGMA. The printing path is as follows: Figure 1 Before formal printing, the substrate needs to be preheated to 120~200℃. High-purity argon is used as the protective gas during printing. After printing, the test block is annealed at 150~200℃ for 2~5 hours. The printing parameter settings are shown in Table 1.

[0020] Table 1 Cold metal transition additive manufacturing process parameters

[0021] (2) The GW63K magnesium alloy thin-walled samples prepared by CMT-WAAM technology were cut using wire-cutting technology. The cutting positions of the samples are shown in the attached figure. Figure 1 After wire cutting, the sample was polished with 400# sandpaper, placed in acetone solution and cleaned with an ultrasonic cleaner to remove surface oil and oxides, and was numbered As-built.

[0022] (3) Set the temperature of the heat treatment furnace, increase the temperature, and use a high-sensitivity thermocouple to test the actual temperature of the furnace chamber to ensure that the actual temperature is the preset temperature, which is 450°C; (4) placing the GW63K magnesium alloy sample in step (2) in the center of the heat treatment furnace chamber after the temperature is raised in step (3) for heat treatment, keeping the temperature and timing the time, the keeping time is 120 min; (5) After the heat preservation is completed, the GW63K magnesium alloy is quickly taken out of the furnace chamber and placed in cold water for quenching. The medium is high-purity distilled water. The obtained sample number is WAAM-T4; (6) The surface of the GW63K magnesium alloy after quenching treatment was dried and placed in the center of the low-temperature heat treatment furnace for heat treatment. The aging temperature was 200 °C and the insulation time was 96 h. The obtained sample was numbered WAAM-T6.

[0023] Example 2 The heat treatment method of cold metal transition arc additive manufacturing GW63K magnesium alloy in this embodiment comprises the following steps: (1) The GW63K magnesium alloy thin-walled samples prepared by CMT-WAAM technology were cut using wire-cutting technology. The wire-cut samples were polished with 400# sandpaper and then cleaned in acetone solution using an ultrasonic cleaner to remove surface oil and oxides.

[0024] (2) Set the temperature of the heat treatment furnace, increase the temperature, and use a high-sensitivity thermocouple to test the actual temperature of the furnace chamber to ensure that the actual temperature is the preset temperature, which is 400°C; (3) placing the GW63K magnesium alloy sample prepared in step (1) in the center of the heat treatment furnace chamber after the temperature is raised in step (2) for heat treatment, keeping the temperature and timing the heat treatment, the keeping time being 120 min; (4) After the insulation is completed, the GW63K magnesium alloy is quickly taken out of the furnace chamber and placed in cold water for quenching treatment. The medium is high-purity distilled water; (5) The surface of the GW63K magnesium alloy after quenching treatment was dried and placed in the center of the low-temperature heat treatment furnace for heat treatment. The aging temperature was kept at 200 °C and the holding time was 96 h.

[0025] Example 3 The heat treatment method of cold metal transition arc additive manufacturing GW63K magnesium alloy in this embodiment comprises the following steps: (1) The GW63K magnesium alloy thin-walled samples prepared by CMT-WAAM technology were cut using wire-cutting technology. The wire-cut samples were polished with 400# sandpaper and then cleaned in acetone solution using an ultrasonic cleaner to remove surface oil and oxides.

[0026] (2) Set the temperature of the heat treatment furnace, increase the temperature, and use a high-sensitivity thermocouple to test the actual temperature of the furnace chamber to ensure that the actual temperature is the preset temperature, which is 425°C; (3) placing the GW63K magnesium alloy sample prepared in step (1) in the center of the heat treatment furnace chamber after the temperature is raised in step (2) for heat treatment, keeping the temperature and timing the heat treatment, the keeping time being 120 min; (4) After the insulation is completed, the GW63K magnesium alloy is quickly taken out of the furnace chamber and placed in cold water for quenching treatment. The medium is high-purity distilled water; (5) The surface of the GW63K magnesium alloy after quenching treatment was dried and placed in the center of the low-temperature heat treatment furnace for heat treatment. The aging temperature was kept at 200 °C and the holding time was 96 h.

[0027] Example 4 The heat treatment method of cold metal transition arc additive manufacturing GW63K magnesium alloy in this embodiment comprises the following steps: (1) The GW63K magnesium alloy thin-walled samples prepared by CMT-WAAM technology were cut using wire-cutting technology. The wire-cut samples were polished with 400# sandpaper and then cleaned in acetone solution using an ultrasonic cleaner to remove surface oil and oxides.

[0028] (2) Set the temperature of the heat treatment furnace, increase the temperature, and use a high-sensitivity thermocouple to test the actual temperature of the furnace chamber to ensure that the actual temperature is the preset temperature, which is 475°C; (3) placing the GW63K magnesium alloy sample prepared in step (1) in the center of the heat treatment furnace chamber after the temperature is raised in step (2) for heat treatment, keeping the temperature and timing the heat treatment, the keeping time being 120 min; (4) After the insulation is completed, the GW63K magnesium alloy is quickly taken out of the furnace chamber and placed in cold water for quenching treatment. The medium is high-purity distilled water; (5) The surface of the GW63K magnesium alloy after quenching treatment was dried and placed in the center of the low-temperature heat treatment furnace for heat treatment. The aging temperature was kept at 200 °C and the holding time was 96 h.

[0029] Example 5 The heat treatment method of cold metal transition arc additive manufacturing GW63K magnesium alloy in this embodiment comprises the following steps: (1) The GW63K magnesium alloy thin-walled samples prepared by CMT-WAAM technology were cut using wire-cutting technology. The wire-cut samples were polished with 400# sandpaper and then cleaned in acetone solution using an ultrasonic cleaner to remove surface oil and oxides.

[0030] (2) Set the temperature of the heat treatment furnace, increase the temperature, and use a high-sensitivity thermocouple to test the actual temperature of the furnace chamber to ensure that the actual temperature is the preset temperature, which is 500°C; (3) placing the GW63K magnesium alloy sample prepared in step (1) in the center of the heat treatment furnace chamber after the temperature is raised in step (2) for heat treatment, keeping the temperature and timing the heat treatment, the keeping time being 120 min; (4) After the insulation is completed, the GW63K magnesium alloy is quickly taken out of the furnace chamber and placed in cold water for quenching treatment. The medium is high-purity distilled water; (5) The surface of the GW63K magnesium alloy after quenching treatment was dried and placed in the center of the low-temperature heat treatment furnace for heat treatment. The aging temperature was kept at 200 °C and the holding time was 96 h.

[0031] Example 6 The heat treatment method of cold metal transition arc additive manufacturing GW63K magnesium alloy in this embodiment comprises the following steps: (1) The GW63K magnesium alloy thin-walled samples prepared by CMT-WAAM technology were cut using wire-cutting technology. The wire-cut samples were polished with 400# sandpaper and then cleaned in acetone solution using an ultrasonic cleaner to remove surface oil and oxides.

[0032] (2) Set the temperature of the heat treatment furnace, increase the temperature, and use a high-sensitivity thermocouple to test the actual temperature of the furnace chamber to ensure that the actual temperature is the preset temperature, which is 525°C; (3) placing the GW63K magnesium alloy sample prepared in step (1) in the center of the heat treatment furnace chamber after the temperature is raised in step (2) for heat treatment, keeping the temperature and timing the heat treatment, the keeping time being 120 min; (4) After the insulation is completed, the GW63K magnesium alloy is quickly taken out of the furnace chamber and placed in cold water for quenching treatment. The medium is high-purity distilled water; (5) The surface of the GW63K magnesium alloy after quenching treatment was dried and placed in the center of the low-temperature heat treatment furnace for heat treatment. The aging temperature was kept at 200 °C and the holding time was 96 h.

[0033] Example 7 The heat treatment method of cold metal transition arc additive manufacturing GW63K magnesium alloy in this embodiment comprises the following steps: (1) The GW63K magnesium alloy thin-walled samples prepared by CMT-WAAM technology were cut using wire-cutting technology. The wire-cut samples were polished with 400# sandpaper and then cleaned in acetone solution using an ultrasonic cleaner to remove surface oil and oxides.

[0034] (2) Set the temperature of the heat treatment furnace, increase the temperature, and use a high-sensitivity thermocouple to test the actual temperature of the furnace chamber to ensure that the actual temperature is the preset temperature, which is 375°C; (3) placing the GW63K magnesium alloy sample prepared in step (1) in the center of the heat treatment furnace chamber after the temperature is raised in step (2) for heat treatment, keeping the temperature and timing the heat treatment, the keeping time being 120 min; (4) After the insulation is completed, the GW63K magnesium alloy is quickly taken out of the furnace chamber and placed in cold water for quenching treatment. The medium is high-purity distilled water; (5) The surface of the GW63K magnesium alloy after quenching treatment was dried and placed in the center of the low-temperature heat treatment furnace for heat treatment. The aging temperature was kept at 200 °C and the holding time was 96 h.

[0035] Example 8 The heat treatment method of cold metal transition arc additive manufacturing GW63K magnesium alloy in this embodiment comprises the following steps: (1) The GW63K magnesium alloy thin-walled samples prepared by CMT-WAAM technology were cut using wire-cutting technology. The wire-cut samples were polished with 400# sandpaper and then cleaned in acetone solution using an ultrasonic cleaner to remove surface oil and oxides.

[0036] (2) Set the temperature of the heat treatment furnace, increase the temperature, and use a high-sensitivity thermocouple to test the actual temperature of the furnace chamber to ensure that the actual temperature is the preset temperature, which is 550°C; (3) placing the GW63K magnesium alloy sample prepared in step (1) in the center of the heat treatment furnace chamber after the temperature is raised in step (2) for heat treatment, keeping the temperature and timing the heat treatment, the keeping time being 120 min; (4) After the insulation is completed, the GW63K magnesium alloy is quickly taken out of the furnace chamber and placed in cold water for quenching treatment. The medium is high-purity distilled water; (5) The surface of the GW63K magnesium alloy after quenching treatment was dried and placed in the center of the low-temperature heat treatment furnace for heat treatment. The aging temperature was kept at 200 °C and the holding time was 96 h.

[0037] Performance testing: Characterization of heat treatment microstructure evolution: In order to compare the effect of the microstructure change of the material after heat treatment on the performance and clarify the relationship between the two, it is first necessary to understand the microstructural evolution of GW63K prepared by CMT-WAAM under different heat treatment regimes. Figure 2 As shown in the figure, the microstructure of CMT-WAAM GW63K alloy at different solution temperatures and times was characterized by OM (Optical microscope, OM). Figure 2 In (a), Figure 2 (b) in Figure 2 shows that after solution treatment at 400 °C and 425 °C for 2 h, a large amount of residual eutectic phase remains at the grain boundaries and is not completely dissolved. Figure 2 (c) in the figure shows that after solution treatment at 450 °C for 2 h, the eutectic phase at the grain boundary has been completely dissolved, and the submicron precipitates are uniformly dispersed in the α-Mg matrix. Figure 2 (d) in Figure 3 shows that after solution heat treatment at 475 °C for 2 h, the grains grow abnormally. Figure 2 It can be seen from (e) and (f) in Figure 1 that when the solution treatment temperature exceeds 475 ℃, the grains of CMT-WAAM GW63K alloy grow abnormally (>100 μm), which is unfavorable to the properties of the alloy. In summary, short-time solution treatment at 450 ℃ can optimize the grain size and precipitation phase morphology of CMT-WAAM GW63K alloy.

[0038] Age hardening curve: like Figure 3As shown in Figure 2, the age-hardening response of solution-treated CMT-WAAM GW63K samples was investigated at an aging temperature of 200°C. The hardness of the solution-treated sample was close to 71±1 HV0.1, which was lower than the hardness of the original sample (81±2HV0.1). The reduction in hardness was due to the diffusion of Gd and Y elements during solution heat treatment and the reduction in the volume fraction of the high-hardness Mg24(Gd,Y)5 eutectic phase. After aging, the hardness first increased with time, reaching a peak at about 96 hours, and then gradually decreased. The initial rapid increase in hardness was due to the high supersaturation of alloying elements, which led to the rapid appearance of a large number of precipitates in the early aging state. According to the curve fitting results, the aging condition of 200°C and 96 hours was determined to be the peak aging regime, and the maximum hardness obtained was 119±2 HV0.1.

[0039] Microstructural characterization of the preferred heat treatment regime: In Mg-Gd-Y-Zr alloys, nanoscale precipitates are often formed after T6 treatment. In order to detect and characterize these fine precipitates, TEM (Transmission Electron Microscopy, TEM) analysis was performed to understand the morphology and distribution at the nanoscale in detail. Figure 4 (a) shows the morphology and distribution of the β′ phase. The β′ phase in the T6 treated sample is arranged in an elliptical triangle along the matrix. Figure 4 The results shown in (b) indicate that the nano-β′ precipitated phase is mainly rich in Gd and Y. Figure 4 The selected area electron diffraction pattern in (c) shows that there are additional diffraction spots at the diffraction points of the matrix. Figure 4 As shown in (e), the size of the nano-β′ phase is about 32.9 nm in length and 10.5 nm in width. Due to the precipitation of these β′ phases, the microstructure of the GW63K magnesium alloy is effectively improved. Therefore, the obtained material has greatly improved strength while meeting the requirements of plasticity and hardness, achieving an excellent strength-toughness synergistic effect.

[0040] Room temperature tensile test: The room temperature tensile test was carried out on the GW63K alloy prepared by CMT-WAAM before and after heat treatment. According to the requirements of GB / T228.1-2010 "Metallic Materials Tensile Test Part 1: Room Temperature Test Method", standard tensile specimens were made and room temperature tensile tests were carried out using SUNS UTM2000 universal testing machine.

[0041] The mechanical properties of CMT-WAAM GW63K samples before and after heat treatment were tested and compared. Figure 5The specific values ​​are shown in Table 2. The yield strength (YS) of the As-built sample is 148 ± 1 MPa, the ultimate tensile strength (UTS) is 267 ± 3 MPa, and the elongation (EL) is 13.7 ± 0.1%. After solution treatment, the UTS and YS of the WAAM-T4 sample slightly decreased, while the EL increased significantly to 26.6 ± 0.9%. The aging process significantly increased the strength of the T6 sample. More specifically, the YS of the WAAM-T6 sample is 246 ± 2 MPa, the UTS is 364 ± 5 ​​MPa, and the EL is 6.9 ± 0.2%.

[0042] Table 2 Room temperature tensile test data (Example 1)

[0043] The above is only a preferred embodiment of the present invention and does not limit the present invention in any way. Any technician in the relevant technical field, without departing from the scope of the technical solution of the present invention, makes any form of equivalent replacement or modification to the technical solution and technical content disclosed in the present invention, which does not depart from the content of the technical solution of the present invention and still falls within the protection scope of the present invention.

Claims

1. A heat treatment method for cold metal transition arc additive manufacturing of GW63K magnesium alloy, characterized in that: The following steps are involved: (1) Preparation of GW63K magnesium alloy samples based on CMT-WAAM technology; (2) Cut the GW63K magnesium alloy sample to remove surface oil and oxides; (3) Set the temperature of the heat treatment furnace, increase the temperature, and test the actual temperature of the furnace chamber to ensure that the actual temperature is the preset temperature; (4) placing the GW63K magnesium alloy sample in step (2) into the heat treatment furnace after the temperature is raised in step (3) for heat treatment, keeping the temperature and timing; (5) After the insulation is completed, the GW63K magnesium alloy is taken out for cold water quenching; (6) Dry the surface of the GW63K magnesium alloy after quenching, place it in a low-temperature heat treatment furnace for heat treatment, keep it warm and time it. In the step (3), the preset temperature is 400-450°C; In the step (6), the preset temperature of the low temperature heat treatment furnace is 200±35°C, and the holding time is 6-144 h.

2. The heat treatment method for cold metal transition arc additive manufacturing of GW63K magnesium alloy according to claim 1, characterized in that: In the step (1), the alloying elements of the GW63K magnesium alloy sample include gadolinium, yttrium and zirconium; the preparation method comprises: preheating the substrate at 120-200° C., using argon as a protective gas, and performing an annealing treatment on the test block at 150-200° C. for 2-5 hours after printing.

3. The heat treatment method for cold metal transition arc additive manufacturing of GW63K magnesium alloy according to claim 1, characterized in that: In step (2), the cut sample is polished and then placed in an acetone solution for ultrasonic cleaning to remove surface oil and oxides.

4. The heat treatment method for cold metal transition arc additive manufacturing of GW63K magnesium alloy according to claim 1, characterized in that: In the step (3), the preset temperature is 450°C.

5. The heat treatment method for cold metal transition arc additive manufacturing of GW63K magnesium alloy according to claim 1, characterized in that: In the step (4), the insulation time is 120±5 min.

6. The heat treatment method for cold metal transition arc additive manufacturing of GW63K magnesium alloy according to claim 1, characterized in that: In the step (5), the cooling method is water cooling, and the medium is distilled water.

7. The heat treatment method for cold metal transition arc additive manufacturing of GW63K magnesium alloy according to claim 1, characterized in that: In the step (6), the aging temperature of the heat treatment of the GW63K magnesium alloy is 200° C., and the holding time is 96 h.

8. An alloy product, characterized in that: The alloy product is obtained by the heat treatment method for cold metal transition arc additive manufacturing of GW63K magnesium alloy as described in any one of claims 1 to 7.

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