Heat treatment method of nickel-based heat-resistant alloy casting and nickel-based heat-resistant alloy product prepared by heat treatment method

Abstract

The invention relates to the technical field of metal materials, in particular to a heat treatment method of a nickel-based heat-resistant alloy casting material and a nickel-based heat-resistant alloy product prepared through the heat treatment method. The heat treatment method of the nickel-based heat-resistant alloy casting comprises the following steps: sequentially carrying out high-temperature diffusion heat treatment, solid solution heat treatment and aging heat treatment on the nickel-based heat-resistant alloy casting to obtain a nickel-based heat-resistant alloy product; wherein the high-temperature diffusion heat treatment and the solid solution heat treatment are both stepped heating processes. A nickel-based heat-resistant alloy product is prepared based on the heat treatment method of the nickel-based heat-resistant alloy casting. According to the heat treatment method for the nickel-based heat-resistant alloy casting and the nickel-based heat-resistant alloy product prepared through the heat treatment method, the strength of the nickel-based heat-resistant alloy casting can be guaranteed, the plasticity of the nickel-based heat-resistant alloy casting can be improved, and the obtained large nickel-based heat-resistant alloy product is stable in mechanical property and good in heat resistance. The method is suitable for production of large-scale key castings (such as cylinders and valve bodies) of steam turbines.

Description

Technical Field

[0001] The present invention relates to the technical field of metal materials, and in particular to a heat treatment method for a nickel-based heat-resistant alloy casting material and a nickel-based heat-resistant alloy product prepared therefrom. Background Art

[0002] Under the background of the current national "dual carbon" strategy, vigorously developing clean and efficient coal-fired power technology represented by large-capacity and high-parameter ultra-supercritical power plants has become one of the important measures for my country to achieve energy conservation and emission reduction goals. With the continuous development of the ultra-supercritical coal-fired power industry, the improvement of steam parameters and thermal efficiency has become an inevitable choice for the current industry progress. But at the same time, the further increase in steam temperature has put forward more stringent requirements on material properties. The performance indicators of traditional ferritic heat-resistant steel can no longer meet the needs of the current development of high-parameter ultra-supercritical units. Therefore, the key casting materials of steam turbines above 650℃ generally use nickel-based heat-resistant alloys.

[0003] The cast nickel-based heat-resistant alloy is easy to deform because it does not undergo subsequent hot and cold processing, and its plasticity and toughness index is generally low. Therefore, a reasonable heat treatment process is crucial to the mechanical properties of cast nickel-based heat-resistant alloys. Since the nickel-based heat-resistant alloy castings of ultra-supercritical units have many alloy elements, large size, thick wall, and complex internal structure, it is difficult to formulate its heat treatment process. How to ensure the strength of the material while improving the plasticity and toughness of the nickel-based heat-resistant alloy castings as much as possible is the core factor restricting the development of 650℃ ultra-supercritical nickel-based heat-resistant alloy castings.

[0004] In the prior art, CN108441704A discloses a preparation process for a nickel-based heat-resistant alloy material, which includes smelting, homogenization, forging and heat treatment steps; the heat treatment includes two processes: solution treatment and aging pretreatment, wherein the solution treatment temperature is 1050-1200°C, and the temperature is kept for 1-5 hours and then water-cooled; the aging pretreatment temperature is 700-800°C, and the temperature is kept for 5-30 hours and then air-cooled. However, its smelting method is a two-step process (vacuum induction melting + electroslag remelting or vacuum induction melting + vacuum consumable remelting) or a three-step process (vacuum induction melting + electroslag remelting + vacuum consumable remelting), which increases the manufacturing cost and has a long production cycle; and the nickel-based heat-resistant alloy involved has a simple structure and relatively low production difficulty; more importantly, the patent subjects the material to forging treatment before heat treatment. It is well known that the organizational structure of the metal material is greatly improved after forging, and the internal microscopic defects are repaired to a certain extent, so the comprehensive mechanical properties of the material are improved, but the performance processing technology of the material that has not undergone forging processing has not been explained and compared.

[0005] CN115613141A discloses a continuous temperature increase heat treatment process for a second-generation nickel-based single crystal high-temperature alloy, comprising: placing a second-generation nickel-based single crystal high-temperature alloy test rod in a heat treatment furnace; in the heat treatment furnace, heating the second-generation nickel-based single crystal high-temperature alloy test rod from room temperature to 1280°C and keeping it warm for 60 minutes; heating the test rod to 1290°C after the insulation is completed and keeping it warm for 120 minutes; heating the test rod to 1300°C after the insulation is completed and keeping it warm for 180 minutes; heating the test rod to 1305°C after the insulation is completed and keeping it warm for 180 minutes; heating the test rod to 1310°C after the insulation is completed and slowly heating the test rod to 1315°C at a heating rate of 1°C / h, opening the furnace and taking it out after reaching the temperature, air cooling the second-generation nickel-based single crystal high-temperature alloy test rod to room temperature, and obtaining the second-generation nickel-based single crystal high-temperature alloy test rod that has been solution treated. However, the heat treatment process for this material requires a vacuum furnace with a maximum temperature of 1350°C. This vacuum furnace needs to use a special heat source to provide heating energy. The effective heating area of ​​the furnace is small and the temperature control accuracy requirements are high. It cannot be used for the heat treatment of large industrial nickel-based components.

[0006] In view of this, it is of great significance to provide a heat treatment method for nickel-based heat-resistant alloy casting materials and a nickel-based heat-resistant alloy product prepared therefrom. Summary of the invention

[0007] The present invention provides a heat treatment method for a nickel-based heat-resistant alloy casting and a nickel-based heat-resistant alloy product prepared therefrom, which can both ensure the strength of the nickel-based heat-resistant alloy casting and improve the plasticity of the nickel-based heat-resistant alloy casting.

[0008] A heat treatment method for a nickel-based heat-resistant alloy casting, the heat treatment method comprising the steps of sequentially performing high-temperature diffusion heat treatment, solid solution heat treatment, and aging heat treatment on the nickel-based heat-resistant alloy casting to obtain a nickel-based heat-resistant alloy product; wherein the high-temperature diffusion heat treatment and the solid solution heat treatment are both step-by-step heating processes.

[0009] In a specific embodiment of the present invention, the chemical element composition and mass percentage of the nickel-based heat-resistant alloy casting are:

[0010] C≤0.05%; Si≤0.3%; Mn≤0.1%; P≤0.01%; S≤0.005%; Cr 21~26%;

[0011] Mo 9~11%;Nb 3.5~5.5%;Fe≤5%;Co≤0.1%;Ti≤0.4%;Al≤0.4%;N≤0.015%;Pb≤0.001%;Bi≤0.0001%;As≤0.005%;Sb≤0.01%;Sn≤0.01%;O≤0.008%;B≤0.006%;Ni is the balance.

[0012] In a specific embodiment of the present invention, the nickel-based heat-resistant alloy casting is made by smelting and pouring.

[0013] In a specific embodiment of the present invention, the step-wise heating process of the high-temperature diffusion heat treatment comprises:

[0014] Keep in a high temperature furnace at a temperature of ≤270℃ for 3 to 6 hours;

[0015] Raise the temperature to 590-610°C at the first high temperature diffusion heating rate and keep it at that temperature for 6-8h;

[0016] Raise the temperature to 910-930°C at the second high temperature diffusion heating rate and keep it for 6-8h;

[0017] Heat the sample to a temperature of 1190-1210°C at the third high temperature diffusion heating rate and keep the temperature for 15-20 hours;

[0018] The furnace is cooled to the temperature of the parts ≤200℃ before being taken out of the furnace;

[0019] Among them, the first high-temperature diffusion heating rate, the second high-temperature diffusion heating rate and the third high-temperature diffusion heating rate are all ≤100°C / h.

[0020] In a specific embodiment of the present invention, the first high-temperature diffusion heating rate, the second high-temperature diffusion heating rate and the third high-temperature diffusion heating rate are all ≤60° C. / h.

[0021] In a specific embodiment of the present invention, the step-wise heating process of the solution heat treatment comprises:

[0022] Keep in a high temperature furnace at a temperature of ≤270℃ for 3 to 6 hours;

[0023] Heat to 790-810°C at the first solid solution heating rate and keep warm for 4-6 hours;

[0024] Raise the temperature to 1040-1060°C at the second solid solution heating rate and keep it for 4-6 hours;

[0025] Heat the sample to a temperature of 1190-1210°C at the third solid solution heating rate and keep the temperature for 15-20 hours;

[0026] Water cooling to the temperature of the parts ≤ 50℃ and then discharge water;

[0027] Among them, the first solid solution heating rate, the second solid solution heating rate and the third solid solution heating rate are all ≤100°C / h.

[0028] In a specific embodiment of the present invention, the first solid solution heating rate, the second solid solution heating rate and the third solid solution heating rate are all ≤60°C / h.

[0029] In a specific embodiment of the present invention, the aging heat treatment comprises:

[0030] Keep in a high temperature furnace at a temperature of ≤270℃ for 1 to 3 hours;

[0031] Heat up to the temperature of 690-710℃ at the aging heating rate and keep warm for 16-36h;

[0032] Air cool after leaving the oven;

[0033] Among them, the aging heating rate is ≤100℃ / h.

[0034] In a specific embodiment of the present invention, the aging heating rate is ≤50°C / h.

[0035] The nickel-based heat-resistant alloy product is made by the above-mentioned heat treatment method.

[0036] The chemical composition and mass percentage of the nickel-based heat-resistant alloy product are as follows: C≤0.05%; Si≤0.3%; Mn≤0.1%; P≤0.01%; S≤0.005%; Cr 21-26%; Mo 9-11%; Nb 3.5-5.5%; Fe≤5%; Co≤0.1%; Ti≤0.4%; Al≤0.4%; N≤0.015%; Pb≤0.001%; ​​Bi≤0.0001%; ​​As≤0.005%; Sb≤0.01%; Sn≤0.01%; O≤0.008%; B≤0.006%; Ni is the balance.

[0037] The mechanical properties requirements of the nickel-based heat-resistant alloy products are as follows:

[0038] 20℃ room temperature test: R p0.2 ≥480MPa; R m ≥580MPa; A≥18%; Z≥30%; KV2≥80J;

[0039] 650℃ test: R p0.2 ≥300MPa; R m ≥340MPa; A≥15%; Z≥25%;

[0040] Among them, R p0.2 Expressed as yield strength, R m It is expressed as tensile strength, A is expressed as elongation, Z is expressed as cross-sectional shrinkage; KV2 is expressed as impact absorption energy.

[0041] In the heat treatment method of the present invention, high-temperature diffusion heat treatment is performed on the nickel-based heat-resistant alloy casting to eliminate the alloy element segregation of the nickel-based heat-resistant alloy casting and improve the uniformity of the alloy composition and structure; solid solution heat treatment is performed to dissolve the carbides, uniformly distribute the elements of the nickel-based heat-resistant alloy casting, and improve the strength of the casting; aging heat treatment is performed to regulate the number, size and distribution of carbides and related strengthening phases in the microstructure of the nickel-based heat-resistant alloy casting so that the material performance meets the standards.

[0042] The beneficial effects of adopting the technical solution are: the nickel-based heat-resistant alloy castings adopt a step-by-step high-temperature diffusion heat treatment + step-by-step solution heat treatment + aging heat treatment process, which is simple to operate, and while ensuring the strength of the nickel-based heat-resistant alloy castings, the plasticity of large nickel-based heat-resistant alloy castings is improved. The obtained large nickel-based heat-resistant alloy products have stable mechanical properties and are suitable for the production of large key castings of steam turbines (such as cylinders and valve bodies). DETAILED DESCRIPTION

[0043] To make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other implementation methods obtained by ordinary technicians in this field without creative work belong to the scope of protection of the present invention.

[0044] A heat treatment method for a nickel-based heat-resistant alloy casting, the heat treatment method comprising the steps of sequentially performing high-temperature diffusion heat treatment, solid solution heat treatment, and aging heat treatment on the nickel-based heat-resistant alloy casting to obtain a nickel-based heat-resistant alloy product; wherein the high-temperature diffusion heat treatment and the solid solution heat treatment are both step-by-step heating processes.

[0045] In some examples, the chemical element composition and mass percentage of the nickel-based heat-resistant alloy casting are:

[0046] C≤0.05%; Si≤0.3%; Mn≤0.1%; P≤0.01%; S≤0.005%; Cr 21~26%;

[0047] Mo 9~11%;Nb 3.5~5.5%;Fe≤5%;Co≤0.1%;Ti≤0.4%;Al≤0.4%;N≤0.015%;Pb≤0.001%;Bi≤0.0001%;As≤0.005%;Sb≤0.01%;Sn≤0.01%;O≤0.008%;B≤0.006%;Ni is the balance.

[0048] In some examples, the nickel-based heat-resistant alloy casting is made by smelting and pouring.

[0049] In some embodiments, the step-wise temperature increase process of the high temperature diffusion heat treatment includes:

[0050] Keep in a high temperature furnace at a temperature of ≤270℃ for 3 to 6 hours;

[0051] Raise the temperature to 590-610°C at the first high temperature diffusion heating rate and keep it at that temperature for 6-8h;

[0052] Raise the temperature to 910-930°C at the second high temperature diffusion heating rate and keep it for 6-8h;

[0053] Heat the sample to a temperature of 1190-1210°C at the third high temperature diffusion heating rate and keep the temperature for 15-20 hours;

[0054] The furnace is cooled to the temperature of the parts ≤200℃ before being taken out of the furnace;

[0055] Among them, the first high-temperature diffusion heating rate, the second high-temperature diffusion heating rate and the third high-temperature diffusion heating rate are all ≤100°C / h.

[0056] In some examples, the first high-temperature diffusion heating rate, the second high-temperature diffusion heating rate, and the third high-temperature diffusion heating rate are all ≤60° C. / h.

[0057] In some embodiments, the step-wise temperature ramp of the solution heat treatment includes:

[0058] Keep in a high temperature furnace at a temperature of ≤270℃ for 3 to 6 hours;

[0059] Heat to 790-810°C at the first solid solution heating rate and keep warm for 4-6 hours;

[0060] Raise the temperature to 1040-1060°C at the second solid solution heating rate and keep it for 4-6 hours;

[0061] Heat the sample to a temperature of 1190-1210°C at the third solid solution heating rate and keep the temperature for 15-20 hours;

[0062] Water cooling to the temperature of the parts ≤ 50℃ and then discharge water;

[0063] Among them, the first solid solution heating rate, the second solid solution heating rate and the third solid solution heating rate are all ≤100°C / h.

[0064] In some examples, the first solution heating rate, the second solution heating rate, and the third solution heating rate are all ≤60° C. / h.

[0065] In some examples, the aging heat treatment includes:

[0066] Keep in a high temperature furnace at a temperature of ≤270℃ for 1 to 3 hours;

[0067] Heat up to the temperature of 690-710℃ at the aging heating rate and keep warm for 16-36h;

[0068] Air cool after leaving the oven;

[0069] Among them, the aging heating rate is ≤100℃ / h.

[0070] In some examples, the aging heating rate is ≤50°C / h.

[0071] The nickel-based heat-resistant alloy product is made by the above-mentioned heat treatment method.

[0072] The specific implementation modes of the present invention are further described below in conjunction with embodiments, but the present invention is not limited to the scope of the embodiments.

[0073] Example 1

[0074] This embodiment performs heat treatment on a large nickel-based heat-resistant alloy casting, and its chemical element composition and mass percentage are as follows:

[0075] C 0.01%; Si 0.22%; Mn 0.02%; P 0.005%; S 0.001%; ​​Cr 21.41%; Mo9.28%; Nb 3.94%; Fe 2.27%; Co 0.01%; Ti 0.28%; Al 0.14%; N 0.0073%; O 0.0025%; B0.004%; the balance is Ni.

[0076] The heat treatment of the large nickel-based heat-resistant alloy casting is specifically as follows:

[0077] Place a large nickel-based heat-resistant alloy casting in a high-temperature furnace with a furnace temperature of ≤270℃ and keep it warm for 6h; then heat it to 600℃ at a rate of ≤40℃ / h and keep it warm for 8h; then heat it to 920℃ at a rate of ≤60℃ / h and keep it warm for 8h; then heat it to 1200℃ at a rate of ≤60℃ / h and keep it warm for 16h; finally, furnace cool it to 400℃ and keep it warm for 2h; then furnace cool it to ≤200℃ and take it out of the furnace to complete the high-temperature diffusion heat treatment.

[0078] The large nickel-based heat-resistant alloy castings that have completed high-temperature diffusion heat treatment are placed in a high-temperature furnace with a furnace temperature of ≤270℃ and kept warm for 6 hours; the temperature is increased to 800℃ at a rate of ≤60℃ / h and kept warm for 6 hours; the temperature is then increased to 1050℃ at a rate of ≤60℃ / h and kept warm for 6 hours; then, the temperature is increased to 1200℃ at a rate of ≤60℃ / h and kept warm for 16 hours; finally, the casting is water-cooled to a temperature of ≤50℃ and discharged to complete the solution heat treatment.

[0079] The large nickel-based heat-resistant alloy castings that have completed the solution heat treatment are placed in a high-temperature furnace with a furnace temperature of ≤270°C and kept warm for 3 hours; the temperature is increased to 700°C at a rate of ≤50°C / h and kept warm for 36 hours; the castings are taken out of the furnace and air-cooled to obtain large nickel-based heat-resistant alloy products.

[0080] The mechanical properties of the attached ingots of large nickel-based heat-resistant alloy products were tested, and the statistical results are shown in Table 1.

[0081] Table 1

[0082]

[0083] Example 2

[0084] This embodiment performs heat treatment on a large nickel-based heat-resistant alloy casting, and its chemical element composition and mass percentage are as follows:

[0085] C 0.016%; Si 0.21%; Mn 0.03%; P 0.007%; S 0.001%; ​​Cr 20.76%; Mo10.02%; Nb 4.1%; Fe 2.43%; Co 0.01%; Ti 0.26%; Al 0.11%; N 0.0065%; O0.0032%; B 0.004%; the balance is Ni.

[0086] The heat treatment of the large nickel-based heat-resistant alloy casting is specifically as follows:

[0087] Place a large nickel-based heat-resistant alloy casting in a high-temperature furnace with a furnace temperature of ≤270℃ and keep it warm for 6h; then heat it to 600℃ at a rate of ≤40℃ / h and keep it warm for 8h; then heat it to 920℃ at a rate of ≤60℃ / h and keep it warm for 8h; then heat it to 1200℃ at a rate of ≤60℃ / h and keep it warm for 16h; finally, furnace cool it to 400℃ and keep it warm for 2h; then furnace cool it to ≤200℃ and take it out of the furnace to complete the high-temperature diffusion heat treatment.

[0088] The large nickel-based heat-resistant alloy castings that have completed high-temperature diffusion heat treatment are placed in a high-temperature furnace with a furnace temperature of ≤270℃ and kept warm for 6 hours; the temperature is increased to 800℃ at a rate of ≤60℃ / h and kept warm for 6 hours; the temperature is then increased to 1050℃ at a rate of ≤60℃ / h and kept warm for 6 hours; then, the temperature is increased to 1200℃ at a rate of ≤60℃ / h and kept warm for 16 hours; finally, the casting is water-cooled to a temperature of ≤50℃ and discharged to complete the solution heat treatment.

[0089] The large nickel-based heat-resistant alloy castings that have completed the solution heat treatment are placed in a high-temperature furnace with a furnace temperature of ≤270°C and kept warm for 3 hours; the temperature is increased to 700°C at a rate of ≤50°C / h and kept warm for 36 hours; the castings are taken out of the furnace and air-cooled to obtain large nickel-based heat-resistant alloy products.

[0090] The mechanical properties of the attached ingots of large nickel-based heat-resistant alloy products were tested, and the statistical results are shown in Table 2.

[0091] Table 2

[0092]

[0093] Example 3

[0094] This embodiment performs heat treatment on a large nickel-based heat-resistant alloy casting, and its chemical element composition and mass percentage are as follows:

[0095] C 0.01%; Si 0.22%; Mn 0.02%; P 0.005%; S 0.001%; ​​Cr 21.41%; Mo9.28%; Nb 3.94%; Fe 2.27%; Co 0.01%; Ti 0.28%; Al 0.14%; N 0.0073%; O 0.0025%; B0.004%; the balance is Ni.

[0096] The heat treatment of the large nickel-based heat-resistant alloy casting is specifically as follows:

[0097] Place the large nickel-based heat-resistant alloy casting in a high-temperature furnace with a furnace temperature of ≤270℃ and keep it warm for 6h; then heat it to 600℃ at a rate of ≤40℃ / h and keep it warm for 8h; then heat it to 910℃ at a rate of ≤60℃ / h and keep it warm for 8h; then heat it to 1190℃ at a rate of ≤60℃ / h and keep it warm for 16h; finally, furnace cool it to 400℃ and keep it warm for 2h; then furnace cool it to ≤200℃ and take it out of the furnace to complete the high-temperature diffusion heat treatment.

[0098] The large nickel-based heat-resistant alloy castings that have completed high-temperature diffusion heat treatment are placed in a high-temperature furnace with a furnace temperature of ≤270℃ and kept warm for 6 hours; the temperature is increased to 790℃ at a rate of ≤60℃ / h and kept warm for 6 hours; the temperature is then increased to 1040℃ at a rate of ≤60℃ / h and kept warm for 6 hours; then, the temperature is increased to 1190℃ at a rate of ≤60℃ / h and kept warm for 16 hours; finally, the casting is water-cooled to a temperature of ≤50℃ and discharged to complete the solution heat treatment.

[0099] The large nickel-based heat-resistant alloy castings that have completed the solution heat treatment are placed in a high-temperature furnace with a furnace temperature of ≤270°C and kept warm for 3 hours; the temperature is increased to 690°C at a rate of ≤50°C / h and kept warm for 36 hours; the castings are taken out of the furnace and air-cooled to obtain large nickel-based heat-resistant alloy products.

[0100] The mechanical properties of the attached ingots of large nickel-based heat-resistant alloy products were tested, and the statistical results are shown in Table 3.

[0101] Table 3

[0102]

Claims

1. A method for heat treatment of a nickel-based heat-resistant alloy casting, characterized in that: The heat treatment method comprises the steps of sequentially performing high-temperature diffusion heat treatment, solid solution heat treatment and aging heat treatment on a nickel-based heat-resistant alloy casting to obtain a nickel-based heat-resistant alloy product; wherein the high-temperature diffusion heat treatment and the solid solution heat treatment are both step-by-step heating processes.

2. The heat treatment method according to claim 1, characterized in that: The chemical element composition and mass percentage of the nickel-based heat-resistant alloy casting are: C≤0.05%; Si≤0.3%; Mn≤0.1%; P≤0.01%; S≤0.005%; Cr 21~26%; Mo 9~11%;Nb 3.5~5.5%;Fe≤5%;Co≤0.1%;Ti≤0.4%;Al≤0.4%;N≤0.015%;Pb≤0.001%;Bi≤0.0001%;As≤0.005%;Sb≤0.01%;Sn≤0.01%;O≤0.008%;B≤0.006%;Ni is the balance.

3. The heat treatment method according to claim 1, characterized in that: The nickel-based heat-resistant alloy casting is made by smelting and pouring.

4. The heat treatment method according to claim 1, characterized in that: The step-wise heating process of the high-temperature diffusion heat treatment comprises: Keep in a high temperature furnace at a temperature of ≤270℃ for 3 to 6 hours; Raise the temperature to 590-610°C at the first high temperature diffusion heating rate and keep it at that temperature for 6-8h; Raise the temperature to 910-930°C at the second high temperature diffusion heating rate and keep it for 6-8h; Heat the sample to a temperature of 1190-1210°C at the third high temperature diffusion heating rate and keep the temperature for 15-20 hours; The furnace is cooled to the temperature of the parts ≤200℃ before being taken out of the furnace; Among them, the first high-temperature diffusion heating rate, the second high-temperature diffusion heating rate and the third high-temperature diffusion heating rate are all ≤100°C / h.

5. The heat treatment method according to claim 4, characterized in that: The first high-temperature diffusion heating rate, the second high-temperature diffusion heating rate and the third high-temperature diffusion heating rate are all ≤60°C / h.

6. The heat treatment method according to claim 1, characterized in that: The step-wise heating process of the solution heat treatment comprises: Keep in a high temperature furnace at a temperature of ≤270℃ for 3 to 6 hours; Heat to 790-810°C at the first solid solution heating rate and keep warm for 4-6 hours; Raise the temperature to 1040-1060°C at the second solid solution heating rate and keep it for 4-6 hours; Heat the sample to a temperature of 1190-1210°C at the third solid solution heating rate and keep the temperature for 15-20 hours; Water cooling to the temperature of the parts ≤ 50℃ and then discharge water; Among them, the first solid solution heating rate, the second solid solution heating rate and the third solid solution heating rate are all ≤100°C / h.

7. The heat treatment method according to claim 6, characterized in that: The first solid solution heating rate, the second solid solution heating rate and the third solid solution heating rate are all ≤60°C / h.

8. The heat treatment method according to claim 1, characterized in that: The aging heat treatment comprises: Keep in a high temperature furnace at a temperature of ≤270℃ for 1 to 3 hours; Heat up to the temperature of 690-710℃ at the aging heating rate and keep warm for 16-36h; Air cool after leaving the oven; Among them, the aging heating rate is ≤100℃ / h.

9. The heat treatment method according to claim 8, characterized in that: Aging heating rate ≤50℃ / h.

10. A nickel-based heat-resistant alloy product made by the heat treatment method according to any one of claims 1 to 9.

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