Heat treatment method for improving mechanical property of additive manufacturing GH4169 high-temperature alloy part

Abstract

The invention discloses a heat treatment method for improving the mechanical property of an additive manufacturing GH4169 high-temperature alloy part, which comprises the following steps: S1, putting the additive manufacturing GH4169 high-temperature alloy part into hot isostatic pressing equipment for heat preservation and pressure maintaining treatment; s2, the additive manufacturing GH4169 high-temperature alloy workpiece obtained in the step S1 is put into a vacuum heat treatment furnace to be subjected to aging treatment; s3, the additive manufacturing GH4169 high-temperature alloy workpiece obtained in the step S2 is put into a cryogenic control box to be subjected to cryogenic treatment; s4, the cooled additive manufacturing GH4169 high-temperature alloy workpiece obtained in the step S3 is put into a vacuum heat treatment furnace to be subjected to heat treatment; s5, the additive manufacturing GH4169 high-temperature alloy part obtained in the step S4 and subjected to aging treatment is put into a cryogenic control box to be subjected to cryogenic treatment; and S6, the cooled additive manufacturing GH4169 high-temperature alloy workpiece obtained in the step S5 is put into a vacuum heat treatment furnace to be heated. The method has the advantages that heat treatment procedures are reduced, and working hours are reduced.

Description

Technical Field

[0001] The invention relates to the technical field of heat treatment, and in particular to a heat treatment method for improving the mechanical properties of additively manufactured GH4169 high-temperature alloy parts. Background Art

[0002] GH4169 high-temperature alloy is a precipitation-strengthened nickel-based high-temperature alloy with good high-temperature mechanical properties, oxidation resistance and corrosion resistance. It is one of the important materials for manufacturing aircraft engine parts. With the rapid development of aircraft engines, aircraft engine parts are also developing towards complexity and structural integration. The existing traditional manufacturing technology is difficult to meet the manufacturing requirements of complex structural parts, which greatly limits the improvement of aircraft engine performance. Additive manufacturing technology is a near-net shaping process. Compared with traditional manufacturing processes, it is more suitable for the manufacture of complex structural parts. Therefore, it has been more and more widely used in the field of aircraft engine manufacturing.

[0003] The additive manufacturing process cools quickly, so the deposited mechanical properties of GH4169 superalloy usually cannot meet the use requirements and must be heat treated before use. At present, the additive manufacturing of GH4169 superalloy usually uses the same heat treatment process as the traditional manufacturing process.

[0004] There are usually pores in additively manufactured metal materials, which may have an adverse effect on the mechanical properties of the formed materials. At present, the mechanical properties of materials are usually improved by hot isostatic pressing, solution treatment and aging treatment, but the conventional process has more steps and takes a long time. Summary of the invention

[0005] The present invention provides a heat treatment method for improving the mechanical properties of additively manufactured GH4169 high-temperature alloy parts, so as to solve the technical problems of more existing process steps and longer working hours.

[0006] According to one aspect of the present invention, a heat treatment method for improving the mechanical properties of additively manufactured GH4169 high-temperature alloy parts is provided, comprising the following steps: S1, placing the additively manufactured GH4169 high-temperature alloy part into a hot isostatic pressing device for heat preservation and pressure holding treatment;

[0007] S2, placing the additively manufactured GH4169 high-temperature alloy component obtained in step S1 after hot isostatic pressing and solution treatment into a vacuum heat treatment furnace for aging treatment;

[0008] S3, placing the additively manufactured GH4169 high-temperature alloy product obtained in step S2 and subjected to aging treatment into a cryogenic control box for cryogenic treatment;

[0009] S4, placing the additively manufactured GH4169 high-temperature alloy part obtained in step S3 and subjected to cooling treatment into a vacuum heat treatment furnace for heating treatment;

[0010] S5, placing the additively manufactured GH4169 high-temperature alloy product obtained in step S4 and subjected to aging treatment into a cryogenic control box for cryogenic treatment;

[0011] S6, placing the additively manufactured GH4169 high-temperature alloy component obtained in step S5 and subjected to cooling treatment into a vacuum heat treatment furnace for heating treatment.

[0012] Optionally, in step S1, the temperature of the heat preservation and pressure holding treatment in the hot isostatic pressing equipment is 1100-1250°C, the pressure is 130MPa-150MPa, and the time is 1h±15min.

[0013] Optionally, in step S1, after the heat and pressure maintenance is completed, the pressure is first reduced to below 100 MPa, and then argon gas is filled in to cool down. When the pressure in the furnace drops below 31 MPa, the filling of argon gas is stopped.

[0014] Optionally, in step S1, when the furnace temperature drops below 300°C, pressure relief is started until the pressure in the furnace reaches 0.

[0015] Optionally, in step S2, the temperature of the vacuum heat treatment furnace is raised to 700-750°C and then kept at this temperature for 6-9 hours; after the temperature is kept at 700-750°C, it is cooled to 600-650°C at a cooling rate of 30-50°C / h and kept at this temperature for 6-9 hours.

[0016] Optionally, in step S2, after the vacuum heat treatment furnace is kept at 600-650°C, argon gas is filled into it and cooled to room temperature.

[0017] Optionally, in the cryogenic treatment described in step 3, the cooling rate is 5 to 10°C / min, and after cooling to -130 to 180°C, the temperature is kept at this temperature for 24 to 48 hours.

[0018] Optionally, in the heating treatment of step 4, after heating to 700-750°C, keep warm for 6-9 hours; after the insulation at 700-750°C is completed, cool to 600-650°C at a cooling rate of 30-50°C / h, and keep warm for 6-9 hours; after the insulation at 600-650°C is completed, fill with argon gas and cool to room temperature.

[0019] Optionally, in the cryogenic treatment described in step 5, the cooling rate is 5 to 10°C / min, and after cooling to -130 to 180°C, the temperature is kept at this temperature for 24 to 48 hours.

[0020] Optionally, in the heating treatment described in step 6, after heating to 700-750°C, keep warm for 6-9 hours; after keeping warm at 700-750°C, cool to 600-650°C at a cooling rate of 30-50°C / h, and keep warm for 6-9 hours; after keeping warm at 600-650°C, fill with argon gas and cool to room temperature.

[0021] In summary, the present application includes at least one of the following beneficial technical effects:

[0022] The present invention simultaneously performs hot isostatic pressing and solution treatment on the additively manufactured GH4169 high-temperature alloy. Through high-temperature solution treatment, the harmful phase formed during the rapid cooling process of additive manufacturing can be fully dissolved. Through hot isostatic pressing, defects such as pores and microcracks in the material can be eliminated. The solution treatment is completed simultaneously during the hot isostatic pressing treatment, which can simplify the process steps and shorten the process time. For the GH4169 high-temperature alloy, the traditional heat treatment system only includes solution aging treatment. For the additively manufactured GH4169 high-temperature alloy, due to the fast cooling speed of the additive manufacturing process, the size of the grain of the formed material is small and the mechanical properties are good. However, after heat treatment, the grain size may grow, resulting in a decrease in mechanical properties. Therefore, the present invention performs two cycles of deep cryogenic treatment on the additively manufactured GH4169 high-temperature alloy that has been subjected to hot isostatic pressing and heat treatment, which can not only refine the grains, but also rotate the grains to form a large number of twins, and can reduce the matrix lattice constant and promote the precipitation of second phase particles. By carrying out the above-mentioned heat treatment targeting the microstructure and performance characteristics of the additively manufactured GH4169 high-temperature alloy, its mechanical properties can be improved and the engineering application of additively manufactured GH4169 high-temperature alloy parts can be promoted.

[0023] In addition to the above-described objects, features and advantages, the present invention has other objects, features and advantages. The present invention is further described in detail below. DETAILED DESCRIPTION

[0024] The following is a detailed description of the embodiments of the present invention, but the present invention can be implemented in many different ways as defined and covered below.

[0025] The present application is described in further detail below.

[0026] The present application embodiment discloses a heat treatment method for improving the mechanical properties of additively manufactured GH4169 high temperature alloy parts, comprising:

[0027] S1, placing the additively manufactured GH4169 high temperature alloy part into a hot isostatic pressing device for heat preservation and pressure holding treatment;

[0028] S2, placing the additively manufactured GH4169 high-temperature alloy component obtained in step S1 after hot isostatic pressing and solution treatment into a vacuum heat treatment furnace for aging treatment;

[0029] S3, placing the additively manufactured GH4169 high-temperature alloy product obtained in step S2 and subjected to aging treatment into a cryogenic control box for cryogenic treatment;

[0030] S4, placing the additively manufactured GH4169 high-temperature alloy part obtained in step S3 and subjected to cooling treatment into a vacuum heat treatment furnace for heating treatment;

[0031] S5, placing the additively manufactured GH4169 high-temperature alloy product obtained in step S4 and subjected to aging treatment into a cryogenic control box for cryogenic treatment;

[0032] S6, placing the additively manufactured GH4169 high-temperature alloy component obtained in step S5 and subjected to cooling treatment into a vacuum heat treatment furnace for heating treatment.

[0033] Specifically, in step S1, the temperature of the heat preservation and pressure treatment in the hot isostatic pressing equipment is 1100-1250°C, the pressure is 130MPa-150MPa, and the time is 1h±15min. In step S1, after the heat preservation and pressure treatment is completed, the pressure is first reduced to below 100MPa, and then argon is filled to cool down. When the pressure in the furnace drops below 31MPa, the filling of argon is stopped. In step S1, when the furnace temperature drops to below 300°C, the pressure is released until the pressure in the furnace is 0.

[0034] The role of step S1 is that, through the combination of hot isostatic pressing and high-temperature solution treatment, it can significantly improve the defects such as pores and microcracks formed in the additive manufacturing process, and improve the density and uniformity of the material. In the high-temperature solution process, harmful phases and inhomogeneous phases are dissolved in the matrix, so that the microstructure of the material is restored to uniformity, providing a more ideal basis for subsequent aging treatment. At the same time, the hot isostatic pressing process can also rearrange the grains in the material, reduce the residual stress in the material, optimize the grain structure, and significantly improve the plasticity and toughness of the material. In addition, by simultaneously performing hot isostatic pressing and solution treatment under high temperature and high pressure environment, the process steps are simplified, the entire processing flow is shortened, the production efficiency is improved, and time and energy costs are saved. Therefore, the key to step 1 is to eliminate the microscopic defects in the additive manufacturing process, optimize the microstructure, and improve the mechanical properties of the material by simultaneously performing hot isostatic pressing and solution treatment, laying a solid foundation for subsequent aging and deep cryogenic treatment, so that the GH4169 high-temperature alloy has excellent comprehensive performance under high temperature and high stress conditions.

[0035] In step S2, the temperature of the vacuum heat treatment furnace is raised to 700-750°C and then kept at this temperature for 6-9 hours; after the temperature is kept at 700-750°C, the temperature is cooled to 600-650°C at a cooling rate of 30-50°C / h and kept at this temperature for 6-9 hours. In step S2, after the temperature is kept at 600-650°C, the vacuum heat treatment furnace is filled with argon gas and cooled to room temperature.

[0036] The purpose of step 2 is to further improve the microstructure and mechanical properties of the alloy by performing aging treatment on the additively manufactured GH4169 high-temperature alloy component after hot isostatic pressing and solution treatment in step 1. In this step, the workpiece is placed in a vacuum heat treatment furnace for aging treatment, usually heated to 700-750℃, so that the alloy elements inside the material can be redistributed and the precipitation of γ' phase and γ" phase can be promoted. The formation of these precipitated phases can significantly improve the strength, hardness and creep resistance of the alloy, thereby enhancing the durability and stability of the material in a high temperature environment. At the same time, the aging treatment can also improve the lattice structure of the material, making it more stable, and can reduce the residual stress inside the workpiece due to the solution treatment, and improve the toughness and ductility of the material. In addition, through reasonable aging treatment, the morphology and size of the precipitated phase can be controlled, thereby optimizing the microstructure of the material, so that the GH4169 alloy can show excellent comprehensive performance when subjected to high temperature and high pressure conditions. Therefore, the aging treatment in step 2 is not only a further supplement to the previous hot isostatic pressing and solution treatment, but also can achieve the best mechanical properties of the alloy by micro-regulating the internal structure of the material and the precipitation of strengthening phases, providing a more optimized material basis for subsequent deep cryogenic treatment and heating treatment.

[0037] In the cryogenic treatment described in step 3, the cooling rate is 5 to 10 ° C / min, and the temperature is kept for 24 to 48 hours after cooling to -130 to 180 ° C. The purpose of step 3 is to further optimize the microstructure and mechanical properties of the material by performing cryogenic treatment on the additively manufactured GH4169 high-temperature alloy parts after aging treatment in step 2. In this step, the parts are placed in a cryogenic control box, and the temperature is rapidly reduced to -130 ° C to -180 ° C at a cooling rate of 510 ° C / minute, and maintained at this temperature for 24-48 hours. Through such cryogenic treatment, the grain structure of the material can be significantly refined, and the grains are induced to rotate and rearrange to a certain extent, which helps to form a twin structure, thereby improving the strength and hardness of the material. In addition, cryogenic treatment helps to reduce the residual stress inside the material and reduce the stress concentration area caused by rapid cooling and processing, thereby improving the toughness and impact resistance of the material and further enhancing its fatigue resistance. Cryogenic treatment will also cause subtle changes in the lattice constant of the material, promoting the precipitation of second-phase particles. This change in microstructure helps to improve the overall stability and wear resistance of the alloy. Therefore, the cryogenic treatment in step 3 plays a key role in the microstructural regulation of the material. Through the effects of grain refinement, twin formation, and residual stress reduction, the additively manufactured GH4169 high-temperature alloy parts have better physical properties and a more stable organizational foundation during the subsequent heating treatment process, thereby significantly improving the performance of the material in harsh use environments.

[0038] In the heating treatment of step 4, after heating to 700-750°C, keep warm for 6-9h; after the insulation at 700-750°C, cool to 600-650°C at a cooling rate of 30-50°C / h, and keep warm for 6-9h; after the insulation at 600-650°C, fill with argon and cool to room temperature. The purpose of this process is to release the stress concentration points generated during the cryogenic treatment through moderate heating, and at the same time promote the transformation of some hard and brittle phases that are broken or precipitated during the cryogenic treatment into more stable dispersed particles, thereby improving the toughness and fatigue resistance of the material. In addition, this heating treatment can further stabilize the grain structure inside the material, avoid the increase of brittleness caused by excessive refinement after cryogenic treatment, and restore the grains to the optimal state by heating, which helps to maintain a fine and uniform organizational structure, thereby enhancing the durability of the material under high temperature and complex stress conditions.

[0039] In the cryogenic treatment described in step 5, the cooling rate is 5 to 10°C / min, and the temperature is kept at -130 to 180°C for 24 to 48 hours. The purpose of this process is that the second cryogenic treatment can cause the grain structure in the material to rotate and rearrange more significantly, so that twins and other strengthening structures are further increased, thereby improving the hardness and strength of the material. In addition, the repetition of cryogenic treatment can reduce the residual stress that may be generated in the previous heating treatment, making the internal structure of the material more stable, while reducing the risk of internal stress concentration, and improving the impact resistance and toughness of the material. The secondary cryogenic treatment can also further promote the precipitation and distribution of the second phase particles, increase the stability and wear resistance of the alloy, so that the material performs better in high temperature and high stress environments. .

[0040] In the heating treatment described in step 6, after heating to 700-750°C, keep warm for 6-9h; after the insulation at 700-750°C is completed, cool to 600-650°C at a cooling rate of 30-50°C / h, and keep warm for 6-9h; after the insulation at 600-650°C is completed, fill with argon and cool to room temperature. The core function of this process is to further homogenize the microstructure produced after deep cryogenic treatment through moderate heat treatment, so that the residual stress and unevenness in the material are completely eliminated. At the same time, the heating treatment helps to stabilize the fine hard and brittle phases precipitated in the previous deep cryogenic processes, so that they are evenly distributed in the matrix, further improving the toughness and fatigue resistance of the material. In addition, this heating treatment can also optimize the grain structure of the material, so that it is further stabilized on the basis of refinement after deep cryogenic treatment, forming uniform and fine grains, thereby enhancing the durability and creep resistance of the material in high temperature environments. Through the slow cooling process, the microcracks and potential defects inside the material are minimized, so that the alloy has higher stability and stronger crack resistance.

[0041] This scheme uses two cryogenic treatments, which has significant advantages over multiple cooling according to gradient, including more significant grain refinement effect, more thorough stress release, more uniform precipitation of strengthening phases, simplified process flow, and improved low-temperature resistance of materials. First, by subjecting the material to an extremely low temperature environment in a short period of time, cryogenic treatment can cause the grains to rotate and rearrange, forming fine grains and twin structures, thereby significantly improving the strength and hardness of the material. However, multiple cooling according to gradient has a slower cooling rate and insufficient driving force for grain refinement, making it difficult to achieve the same effect. Secondly, through two cryogenic treatments, the residual stress generated during the high-temperature heat treatment process can be quickly eliminated after each treatment, thereby effectively reducing the brittleness of the material and improving its toughness. In comparison, the stress release effect of gradient cooling is not as thorough as that of cryogenic treatment. Cryogenic treatment can also promote the precipitation of fine strengthening phases (such as γ' phase and γ” phase) inside the alloy and make them more evenly distributed in the matrix, thereby improving the wear resistance and creep resistance of the alloy, while gradient cooling may lead to insufficient precipitation of strengthening phases. In terms of process flow, although cryogenic treatment needs to be carried out at extremely low temperatures, by concentrating on two cryogenic treatments, the overall heat treatment cycle can be shortened, the complex operation and control difficulties caused by multiple treatments can be avoided, and production efficiency can be improved. Finally, cryogenic treatment gives the material higher low-temperature resistance, making its application performance in extreme temperature environments better, while gradient cooling is difficult to achieve the same low-temperature strengthening effect. Therefore, compared with multiple cooling according to the gradient, this scheme significantly improves the mechanical properties and heat treatment efficiency of the additively manufactured GH4169 high-temperature alloy through two cryogenic treatments, so that the material has better performance in both high and low temperature environments.

[0042] Example 1

[0043] The heat treatment method of the additively manufactured GH4169 high temperature alloy material includes the following steps:

[0044] (1) Additive manufacturing of GH4169 high-temperature alloy parts using laser powder bed fusion technology;

[0045] (2) The additively manufactured GH4169 high-temperature alloy was placed in a hot isostatic pressing device for heat preservation and pressure holding treatment at a temperature of 1200°C, a pressure of 140 MPa, and a time of 1 h.

[0046] (3) After the heat and pressure maintenance is completed, the pressure is reduced to 90 MPa and argon gas is filled in to cool down.

[0047] (4) When the pressure in the furnace drops to 28 MPa, stop charging argon.

[0048] (5) When the furnace temperature drops to 290°C, start to release the pressure until the pressure inside the furnace reaches 0.

[0049] (6) After the heat and pressure treatment, the workpiece is placed in an argon furnace for aging treatment, the temperature is raised to 750°C and kept at this temperature for 7 hours.

[0050] (7) After the insulation is completed, cool to 650°C at a cooling rate of 30°C / h and keep it at this temperature for 8h.

[0051] (8) After the insulation is completed, fill with argon gas and cool to room temperature.

[0052] (9) The aging treated parts are placed in a deep cold control box for cooling at a cooling rate of 10°C / min. After cooling to -160°C, they are kept warm for 36 hours.

[0053] (10) The cryogenically treated workpiece is placed in an argon furnace for heating treatment, the temperature is raised to 700°C and kept at this temperature for 9 h.

[0054] (11) After the insulation is completed, cool to 650°C at a cooling rate of 30°C / h and keep it at this temperature for 6h.

[0055] (12) After the insulation is completed, argon gas is filled in and cooled to room temperature.

[0056] (13) The heated workpiece is placed in a cryogenic control box for cooling at a cooling rate of 10°C / min. After cooling to -160°C, keep the temperature for 36 hours.

[0057] (14) The cryogenically treated workpiece is placed in an argon furnace for heating treatment, the temperature is raised to 700 °C and kept at this temperature for 9 h.

[0058] (15) After the insulation is completed, cool to 650°C at a cooling rate of 30°C / h and keep it at this temperature for 6h.

[0059] (16) After the insulation is completed, argon gas is filled in and cooled to room temperature.

[0060] Example 2

[0061] The heat treatment method of the additively manufactured GH4169 high temperature alloy material includes the following steps:

[0062] (1) Additive manufacturing of GH4169 high-temperature alloy parts using laser powder bed fusion technology;

[0063] (2) The additively manufactured GH4169 high-temperature alloy was placed in a hot isostatic pressing device for heat preservation and pressure holding treatment at a temperature of 1100°C, a pressure of 150 MPa, and a time of 1 h 10 min.

[0064] (3) After the heat and pressure maintenance is completed, the pressure is reduced to 75 MPa and argon gas is filled in to cool down.

[0065] (4) When the pressure in the furnace drops to 30 MPa, stop charging argon.

[0066] (5) When the furnace temperature drops to 260°C, start to release the pressure until the pressure inside the furnace reaches 0.

[0067] (6) After the heat and pressure treatment, the workpiece is placed in an argon furnace for aging treatment, the temperature is raised to 740°C and kept at this temperature for 6.5 hours.

[0068] (7) After the insulation is completed, cool to 620°C at a cooling rate of 40°C / h and keep it at this temperature for 7h.

[0069] (8) After the insulation is completed, fill with argon gas and cool to room temperature.

[0070] (9) The aging treated parts are placed in a deep cold control box for cooling at a cooling rate of 8°C / min. After cooling to -180°C, they are kept warm for 24 hours.

[0071] (10) The cryogenically treated workpiece is placed in an argon furnace for heating treatment, the temperature is raised to 750°C and kept at this temperature for 6 h.

[0072] (11) After the insulation is completed, cool to 600°C at a cooling rate of 50°C / h and keep it at this temperature for 9h.

[0073] (12) After the insulation is completed, argon gas is filled in and cooled to room temperature.

[0074] (13) The heated workpiece is placed in a cryogenic control box for cooling at a cooling rate of 8°C / min. After cooling to -180°C, keep the temperature for 24 hours.

[0075] (14) The cryogenically treated workpiece is placed in an argon furnace for heating treatment, the temperature is raised to 750 °C and kept at this temperature for 6 h.

[0076] (15) After the insulation is completed, cool to 600°C at a cooling rate of 50°C / h and keep it at this temperature for 9h.

[0077] (16) After the insulation is completed, argon gas is filled in and cooled to room temperature.

[0078] Example 3

[0079] The heat treatment method of the additively manufactured GH4169 high temperature alloy material includes the following steps:

[0080] (1) Additive manufacturing of GH4169 high-temperature alloy parts using laser powder bed fusion technology;

[0081] (2) The additively manufactured GH4169 high-temperature alloy was placed in a hot isostatic pressing device for heat preservation and pressure holding treatment at a temperature of 1250°C, a pressure of 130 MPa, and a time of 50 min.

[0082] (3) After the heat and pressure maintenance is completed, the pressure is reduced to 95 MPa and argon gas is filled in to cool down.

[0083] (4) When the pressure in the furnace drops to 27 MPa, stop charging argon.

[0084] (5) When the furnace temperature drops to 290°C, start to release the pressure until the pressure inside the furnace reaches 0.

[0085] (6) After the heat and pressure treatment, the workpiece is placed in an argon furnace for aging treatment, the temperature is raised to 700°C and kept at this temperature for 9 hours.

[0086] (7) After the insulation is completed, cool to 600°C at a cooling rate of 35°C / h and keep it at this temperature for 9 hours.

[0087] (8) After the insulation is completed, fill with argon gas and cool to room temperature.

[0088] (9) The aging treated parts are placed in a cryogenic control box for cooling at a cooling rate of 8°C / min. After cooling to -130°C, they are kept warm for 48 hours.

[0089] (10) The cryogenically treated workpiece is placed in an argon furnace for heating treatment, the temperature is raised to 730 °C and kept at this temperature for 7 h.

[0090] (11) After the insulation is completed, cool to 610°C at a cooling rate of 50°C / h and keep it at this temperature for 8h.

[0091] (12) After the insulation is completed, argon gas is filled in and cooled to room temperature.

[0092] (13) The heated workpiece is placed in a cryogenic control box for cooling at a cooling rate of 8°C / min. After cooling to -130°C, keep the temperature for 48 hours.

[0093] (14) The cryogenically treated workpiece is placed in an argon furnace for heating treatment, the temperature is raised to 730 °C and kept at this temperature for 7 h.

[0094] (15) After the insulation is completed, cool to 610°C at a cooling rate of 50°C / h and keep it at this temperature for 8h.

[0095] (16) After the insulation is completed, argon gas is filled in and cooled to room temperature.

[0096] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A heat treatment method for improving the mechanical properties of additively manufactured GH4169 high-temperature alloy parts, characterized in that: The steps include: S1, placing the additively manufactured GH4169 high temperature alloy part into a hot isostatic pressing device for heat preservation and pressure holding treatment; S2, placing the additively manufactured GH4169 high-temperature alloy component obtained in step S1 after hot isostatic pressing and solution treatment into a vacuum heat treatment furnace for aging treatment; S3, placing the additively manufactured GH4169 high-temperature alloy product obtained in step S2 and subjected to aging treatment into a cryogenic control box for cryogenic treatment; S4, placing the additively manufactured GH4169 high-temperature alloy part obtained in step S3 and subjected to cooling treatment into a vacuum heat treatment furnace for heating treatment; S5, placing the additively manufactured GH4169 high-temperature alloy product obtained in step S4 and subjected to aging treatment into a cryogenic control box for cryogenic treatment; S6, placing the additively manufactured GH4169 high-temperature alloy component obtained in step S5 and subjected to cooling treatment into a vacuum heat treatment furnace for heating treatment.

2. The heat treatment method for improving the mechanical properties of additively manufactured GH4169 high-temperature alloy parts according to claim 1, characterized in that: In step S1, the temperature of the heat preservation and pressure preservation treatment in the hot isostatic pressing equipment is 1100-1250°C, the pressure is 130MPa-150MPa, and the time is 1h±15min.

3. The heat treatment method for improving the mechanical properties of additively manufactured GH4169 high-temperature alloy parts according to claim 2, characterized in that: In step S1, after the heat preservation and pressure maintenance are completed, the pressure is first reduced to below 100 MPa, and then argon gas is filled in to cool down. When the pressure in the furnace drops below 31 MPa, the filling of argon gas is stopped.

4. The heat treatment method for improving the mechanical properties of additively manufactured GH4169 high-temperature alloy parts according to claim 3, characterized in that: In step S1, when the furnace temperature drops below 300°C, pressure relief begins until the pressure in the furnace reaches 0.

5. The heat treatment method for improving the mechanical properties of additively manufactured GH4169 high-temperature alloy parts according to claim 1, characterized in that: In step S2, the temperature of the vacuum heat treatment furnace is raised to 700-750°C and then kept at this temperature for 6-9 hours; After the insulation at 700-750℃ is completed, cool to 600-650℃ at a cooling rate of 30-50℃ / h and keep it at this temperature for 6-9h.

6. The heat treatment method for improving the mechanical properties of additively manufactured GH4169 high-temperature alloy parts according to claim 5, characterized in that: In step S2, after the vacuum heat treatment furnace is kept at 600-650°C, argon gas is filled into it and cooled to room temperature.

7. The heat treatment method for improving the mechanical properties of additively manufactured GH4169 high-temperature alloy parts according to claim 1, characterized in that: In the cryogenic treatment described in step 3, the cooling rate is 5 to 10°C / min, and after cooling to -130 to 180°C, the temperature is kept for 24 to 48 hours.

8. The heat treatment method for improving the mechanical properties of additively manufactured GH4169 high temperature alloy parts according to claim 1, characterized in that: In the heating treatment of step 4, the temperature is raised to 700-750° C. and then kept at this temperature for 6-9 hours; After the temperature is kept at 700-750°C, cool to 600-650°C at a cooling rate of 30-50°C / h and keep warm for 6-9h; After the temperature was kept at 600-650℃, argon gas was filled in and cooled to room temperature.

9. The heat treatment method for improving the mechanical properties of additively manufactured GH4169 high-temperature alloy parts according to claim 1, characterized in that: In the cryogenic treatment described in step 5, the cooling rate is 5 to 10°C / min, and after cooling to -130 to 180°C, the temperature is kept for 24 to 48 hours.

10. The heat treatment method for improving the mechanical properties of additively manufactured GH4169 high temperature alloy parts according to claim 1, characterized in that: In the heating treatment described in step 6, the temperature is raised to 700-750° C. and then kept at this temperature for 6-9 hours; After the temperature is kept at 700-750°C, cool to 600-650°C at a cooling rate of 30-50°C / h and keep warm for 6-9h; After the temperature was kept at 600-650℃, argon gas was filled in and cooled to room temperature.