A method for heat treating a strengthened superalloy casting

Abstract

The application discloses a kind of reinforced high-temperature alloy casting heat treatment method, comprising: after high-temperature box of casting is directly sent into program control trolley furnace, and carry out step temperature homogenization treatment, eliminate casting composition segregation by multi-section gradient heating and section heat preservation, release solidification stress, and obtain homogeneous casting semi-finished product after cooling;Again, semi-finished product is heated and heat treated to carry out solid solution treatment, dissolve coarse brittle impurities, and obtain pure saturated metal matrix;Finally, multi-temperature zone section differentiation rate controlled cooling is used, and the buffer is set in the heat preservation at medium temperature, and quickly avoids harmful phase precipitation sensitive interval.The application can effectively avoid the problem of casting cracking and uneven structure, balance the room temperature mechanical properties and high-temperature durability stability, and meet the long-term service manufacturing requirements of supercritical unit high-temperature pressure parts.

Description

Technical Field

[0001] This invention belongs to the field of alloy heat treatment technology, and relates to a heat treatment method for strengthening high-temperature alloy castings. Background Technology

[0002] With the industrialization of 650℃-class ultra-supercritical units, core high-temperature pressure-bearing components such as cylinders and valve bodies are using precipitation-strengthened nickel-iron-based thick-walled complex castings, operating in the temperature range of 650℃~700℃. This alloy has poor melt fluidity, low thermal conductivity, and large solidification shrinkage, making the castings prone to porosity, looseness, and shrinkage cavities during solidification. Simultaneously, differences in wall thickness lead to enormous solidification stress, resulting in severe dendrite formation and compositional segregation, making them highly susceptible to crack initiation and threatening the safe operation of the unit. Existing conventional heat treatment processes suffer from a lack of multi-stage buffering and heat preservation during uniform heating, resulting in large temperature differences between the surface and interior of thick-walled parts. This makes them prone to cracking during the heating phase and fails to adequately eliminate compositional segregation. Traditional solution treatment processes cannot completely dissolve coarse and brittle phases, leading to insufficient matrix solution and inherently damaging the casting's plasticity and high-temperature creep resistance. Cooling often employs a single cooling rate, failing to avoid the sensitive range of 700-930℃ for harmful phase precipitation. Excessive cooling generates cooling stress, while excessively slow cooling induces the precipitation of chain-like brittle phases, making it difficult to balance strength, plasticity, and high-temperature performance. Traditional processes involve high-temperature castings being air-cooled and then reheated, introducing secondary temperature stress. Homogenization and multiple-furnace processing cause repeated hot and cold cycles, leading to continuous accumulation of internal stress and easy deformation during machining. The existing process's overall temperature change rate, segmented heat preservation, and graded controlled cooling parameters are incompatible with the characteristics of this nickel-iron-based alloy. Defects such as casting segregation, cracks, and harmful phase precipitation cannot be effectively controlled, making it difficult to stably produce power plant thick-walled castings with uniform microstructure and satisfactory high-temperature creep resistance, thus limiting engineering manufacturing. Summary of the Invention

[0003] The purpose of this invention is to solve the problems that conventional heat treatment processes in the prior art cannot be adapted to thick-walled complex nickel-iron-based high-temperature alloy castings for power plants, which are prone to casting segregation, heat treatment cracking, precipitation of harmful brittle phases, and difficulty in balancing high and low temperature mechanical properties. This invention provides a heat treatment method for strengthening high-temperature alloy castings.

[0004] To achieve the above objectives, the present invention employs the following technical solution: A heat treatment method for strengthening high-temperature alloy castings, comprising: Molten alloy is poured into the sand box to solidify and form the casting. The sand box is then disassembled and the casting blank is removed while the casting is kept at a high temperature. Set the first heating rate and heat the casting blank in stages. When the composition of the casting becomes homogeneous, cool the casting to room temperature to obtain the semi-finished casting. The semi-finished casting is heated at a set second heating rate until it reaches the performance treatment temperature range, and the heated semi-finished casting is kept at the temperature to obtain a pure matrix with uniform composition and no brittle large particles. According to different cooling rates, the pure matrix is ​​cooled in stages until it is cooled to room temperature, thus obtaining a reinforced high-temperature alloy casting.

[0005] A further improvement of the present invention is that: Furthermore, the reinforced high-temperature alloy casting is made of nickel-iron based alloy, with an application temperature of 650℃~700℃, wherein the mass fraction of Fe and Co in the alloy is controlled at 40%≤Fe<47% and 0.005%≤Co≤0.3%.

[0006] Furthermore, the second heating rate is not less than the first heating rate.

[0007] Furthermore, the first heating rate is set, and the casting blank is heated in stages. After the composition of the casting becomes homogenized, the casting is cooled to room temperature to obtain a semi-finished casting. Specifically, the high-temperature casting blank is fed into a programmable trolley furnace and heated at a constant heating rate of 25℃ / h. When the first heating range of 700℃~1100℃ is reached, the casting blank is held in stages at 200℃ intervals, with each stage lasting 2.5h~4h. Used to release thermal stress in thick-walled castings; when the second heating range of 1100℃~1200℃ is reached, the temperature is maintained in segments with a temperature interval of 50℃, and the duration of each segment is 4.5h~5.5h, to eliminate dendritic segregation; the temperature is continuously raised to the homogenization final temperature of 1200℃~1210℃ and held at that temperature for 33h~36h to achieve homogenization of the casting composition; after the homogenization holding is completed, the casting is cooled to room temperature at a furnace cooling rate of 10℃ / h~15℃ / h to obtain the semi-finished casting.

[0008] Furthermore, the process of heating the semi-finished casting at a set second heating rate until it reaches the performance treatment temperature range, and then holding the heated semi-finished casting at that temperature to obtain a pure matrix with uniform composition and no brittle large particles, specifically involves: heating the semi-finished casting to room temperature at a heating rate of 25℃ / h to 35℃ / h to the performance treatment temperature range of 1005℃ to 1020℃, and holding it at that temperature for 6h to 10h; dissolving the coarse and brittle impurities in the semi-finished casting to obtain a pure matrix with uniform composition and no brittle large particles.

[0009] Furthermore, the pure matrix is ​​cooled in stages according to different cooling rates until it reaches room temperature to obtain a reinforced high-temperature alloy casting. Specifically, the pure matrix is ​​cooled to the first temperature zone of 900℃ to 930℃ at a cooling rate of 10℃ / h to 15℃ / h and held at that temperature for 2h to 3h. After holding, the pure matrix in the first temperature zone is cooled to the second temperature zone of 700℃ to 750℃ at a cooling rate of 70℃ / h to 75℃ / h, passing through the sensitive range for the precipitation of harmful brittle phases and avoiding the formation of chain-like and blocky brittle phases. When cooled to 700℃ to 750℃, the cooling rate is switched again to 10℃ / h to 15℃ / h to cool to room temperature to obtain a reinforced nickel-iron-based high-temperature alloy casting.

[0010] Furthermore, before heating the casting blank in stages, the process also includes: after removing the high-temperature casting blank from the sand box, without air cooling or open-air transfer, directly sending the blank into the programmable trolley furnace.

[0011] Furthermore, the segmented and stepped heating of the casting blank, the heating of the semi-finished casting at a set second heating rate, and the phased cooling of the pure matrix are all carried out by the temperature control system of the programmable trolley furnace itself to ensure that the cooling rate of the casting surface and the interior is synchronized and completed continuously in a closed loop within the same programmable trolley furnace.

[0012] Furthermore, when the furnace temperature reaches the first heating range of 700℃ to 1100℃, it is kept warm in segments with a temperature interval of 200℃, and the duration of each segment is 2.5h to 4h. Specifically, when the furnace temperature reaches 700℃ in the first heating range, a buffer heat preservation is performed every 200℃ increase; the duration of each segment is 2.5h to 4h, until the furnace temperature reaches 1100℃.

[0013] Furthermore, when the furnace temperature reaches the second heating range of 1100℃~1200℃, it is kept warm in segments with a temperature interval of 50℃, and the duration of each segment is 4.5h~5.5h. Specifically, when the furnace temperature reaches 1100℃ in the second heating range, a buffer heat preservation is performed every 20℃ increase; the duration of each segment is 4.5h~5.5h, until the furnace temperature reaches a homogeneous final temperature of 1200℃~1210℃, and after completing 33h~36h of homogeneous heat preservation, the temperature is lowered.

[0014] Compared with the prior art, the present invention has the following beneficial effects: This invention involves directly feeding the high-temperature casting into a programmable furnace and performing a stepped temperature homogenization process. Multi-stage gradient heating and segmented holding eliminate casting component segregation and release solidification stress, resulting in a homogeneous semi-finished casting after cooling. The semi-finished casting is then subjected to solution treatment at elevated temperatures to dissolve coarse and brittle impurities, yielding a pure saturated metal matrix. Finally, multi-temperature segmented differentiated rate controlled cooling is employed, with a mid-temperature holding buffer and rapid avoidance of sensitive areas prone to harmful phase precipitation. This invention effectively avoids casting cracking and uneven microstructure, achieving a balanced combination of room-temperature mechanical properties and high-temperature long-term stability, meeting the long-term service requirements of high-temperature pressure-bearing components in supercritical units. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic flowchart of a heat treatment method for reinforced high-temperature alloy castings according to the present invention. Figure 2 Schematic diagram of the metallographic structure of the high-pressure inner cylinder casting test block; Figure 3 A schematic diagram of the metallographic structure of the valve body casting test block. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0018] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0019] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0020] In the description of the embodiments of the present invention, it should be noted that if terms such as "upper," "lower," "horizontal," or "inner" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of the invention is in use, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. Furthermore, terms such as "first" and "second" are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0021] Furthermore, the use of the term "horizontal" does not imply that the component must be absolutely horizontal, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0022] In the description of the embodiments of the present invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention according to the specific circumstances.

[0023] The present invention will now be described in further detail with reference to the accompanying drawings: See Figure 1 This invention discloses a heat treatment method for reinforced high-temperature alloy castings, comprising: S101: The molten alloy is poured into the sand box to solidify and form the casting, and the sand box is disassembled to remove the casting blank while the casting is kept at a high temperature. The reinforced high-temperature alloy casting is made of nickel-iron based alloy, with an application temperature of 650℃~700℃. The mass fraction of Fe and Co in the alloy is controlled at 40%≤Fe<47% and 0.005%≤Co≤0.3%. Before the segmented step heating of the casting blank, the process includes: after disassembling the sand box and removing the high-temperature casting blank, without air cooling or open-air transfer, the blank is directly sent into the programmable trolley furnace.

[0024] S102: Set the first heating rate and perform segmented step heating on the casting blank. When the composition of the casting reaches homogenization, cool the casting to room temperature to obtain a semi-finished casting. The high-temperature casting blank is fed into a programmable trolley furnace and heated at a constant heating rate of 25℃ / h. When the first heating range of 700℃ to 1100℃ is reached, it is held in sections at 200℃ intervals for 2.5 to 4 hours to release thermal stress in thick-walled castings. When the second heating range of 1100℃ to 1200℃ is reached, it is held in sections at 50℃ intervals for 4.5 to 5.5 hours to eliminate dendritic segregation. The temperature is then continuously increased to a homogenization final temperature of 1200℃ to 1210℃ and held at that temperature for 33 to 36 hours to achieve homogenization of the casting composition. After the homogenization holding is completed, the casting is cooled to room temperature at a furnace cooling rate of 10℃ to 15℃ / h to obtain a semi-finished casting.

[0025] S103: The semi-finished casting is heated at a set second heating rate until it reaches the performance treatment temperature range, and the heated semi-finished casting is kept at the temperature to obtain a pure matrix with uniform composition and no brittle large particles; the second heating rate is not less than the first heating rate.

[0026] For the semi-finished castings cooled to room temperature, the castings are heated to a performance treatment temperature range of 1005℃~1020℃ at a heating rate of 25℃ / h~35℃ / h and held at that temperature for 6h~10h; this process dissolves the coarse and brittle impurities in the semi-finished castings, resulting in a pure matrix with uniform composition and no brittle large particles.

[0027] S104: According to different cooling rates, the pure matrix is ​​cooled in stages until it is cooled to room temperature to obtain a reinforced high-temperature alloy casting.

[0028] The pure matrix is ​​cooled to the first temperature zone of 900℃~930℃ at a cooling rate of 10℃ / h~15℃ / h and held at that temperature for 2h~3h. After holding, the pure matrix in the first temperature zone is cooled to the second temperature zone of 700℃~750℃ at a cooling rate of 70℃ / h~75℃ / h to pass through the sensitive range of harmful brittle phase precipitation and avoid the formation of chain-like and blocky brittle phases. When cooled to 700℃~750℃, the cooling rate is switched again to 10℃ / h~15℃ / h to cool to room temperature to obtain the reinforced nickel-iron-based high-temperature alloy casting.

[0029] The process involves segmented, stepped heating of the casting blank, heating of the semi-finished casting at a set second heating rate, and phased cooling of the pure matrix. The heating and cooling of the casting is achieved through the programmable trolley furnace's own temperature control system, ensuring synchronized cooling rates between the surface and interior of the casting, and completing this process continuously in a closed loop within the same programmable trolley furnace. When the first heating range of 700℃ to 1100℃ is reached, segmented holding is performed at 200℃ intervals, with each segment holding lasting 2.5 to 4 hours. Specifically, when the furnace temperature reaches 700℃ in the first heating range, a buffer holding is performed every 200℃ increase; each segment holding lasts 2.5 to 4 hours until the furnace temperature reaches 1100℃. When the furnace temperature reaches the second heating range of 1100℃~1200℃, it is kept in sections with a temperature interval of 50℃, and the duration of each section is 4.5h~5.5h. Specifically, when the furnace temperature reaches 1100℃ in the second heating range, a buffer heat preservation is performed every 20℃ increase; the duration of each section is 4.5h~5.5h, until the furnace temperature reaches a homogeneous final temperature of 1200℃~1210℃, and after completing 33h~36h of homogeneous heat preservation, the temperature is lowered.

[0030] Example: This invention discloses a heat treatment method for reinforced high-temperature alloy castings, comprising: a high-pressure inner cylinder for power plants, wherein the mass percentage of Fe is approximately 42% and the mass percentage of Co is approximately 0.007%. During the cylinder casting process, after smelting, pouring, heat preservation, and molding, the cylinder is directly fed into a programmable trolley furnace. The furnace temperature is increased at a rate of 25°C / h to 700°C. Within the temperature range of 700°C to 1100°C, the temperature is increased by 200°C and held for 3 hours. After reaching 1100°C and holding for 3 hours, the furnace temperature is increased at a rate of 25°C / h. When 1100°C < t (furnace temperature) < 1200°C, the temperature is increased by 50°C and held for 4.5 hours. That is, when the furnace temperature reaches 1150°C, the temperature is held for 4.5 hours. When the furnace temperature reaches the final homogenization treatment temperature (third stage temperature) of 1200°C, the temperature is held for 34 hours. After that, the furnace temperature is cooled to room temperature at a rate of 10°C / h. After the casting cools to room temperature in the furnace, the furnace temperature is increased to 1010℃ at a rate of 25℃ / h and held for 8 hours. After the holding time is completed, the casting is cooled to 900℃ at a rate of 10℃ / h in the first temperature zone and held for 3 hours. Then, it is cooled to 700℃ at a rate of 70℃ / h in the second temperature zone, and finally cooled to room temperature at a rate of 10℃ / h in the third temperature zone. The heat treatment is then complete.

[0031] Performance tests were conducted on the cast test blocks. Table 1 shows the test results of the mechanical properties of the high-pressure inner cylinder. Figure 2 Table 2 shows the metallographic images of the high-pressure inner cylinder and the test results of its high-temperature creep performance. The results indicate that the reinforcing phase is uniformly distributed in the microstructure of the high-pressure inner cylinder, with no obvious defects or inclusions, demonstrating good high-temperature performance.

[0032] Table 1. Test results of mechanical properties of the high-pressure inner cylinder cast specimen.

[0033] Table 2. High-Temperature Creep Performance Test Results of Cast-in-Place Specimens for High-Pressure Inner Cylinder

[0034] Example 2 The heat treatment method for precipitation-strengthened high-temperature alloy castings for power plants provided by this invention includes: a power plant iron-nickel-based valve shell, wherein the mass percentage of Fe is approximately 43% and the mass percentage of Co is approximately 1.0%. During the valve shell casting process, after smelting, pouring, heat preservation, and molding, the valve shell is directly fed into a programmable trolley furnace. The furnace temperature is increased to 700℃ at a rate of 25℃ / h. Within the temperature range of 700℃ to 1100℃, the temperature is increased by 200℃ and held for 4 hours. When the temperature reaches 1100℃ and is held for 4 hours, the furnace temperature is increased by 25℃ / h. When 1100℃ < t (furnace temperature) < 1210℃, the temperature is increased by 50℃ and held for 5 hours. That is, when the furnace temperature reaches 1150℃ and 1200℃, the temperature is held for 5 hours respectively. When the furnace temperature reaches the final homogenization treatment temperature (third stage temperature) of 1210℃, the temperature is held for 33 hours, and then the furnace temperature is cooled to room temperature at a rate of 12℃ / h. After the casting cools to room temperature in the furnace, the furnace temperature is increased to 1020℃ at a rate of 25℃ / h and held for 6 hours. After the holding time is completed, the casting is cooled to 930℃ at a rate of 15℃ / h in the first temperature zone and held for 2 hours. Then, it is cooled to 750℃ at a rate of 75℃ / h in the second temperature zone, and finally cooled to room temperature at a rate of 15℃ / h in the third temperature zone. The heat treatment is then complete.

[0035] Performance tests were conducted on the cast test blocks. Table 3 shows the results of the valve shell tensile hardness test. Figure 3 Table 4 shows the metallographic structure of the valve body and the results of the high-temperature creep performance test of the valve body.

[0036] Table 3. Test results of mechanical properties of valve body castings

[0037] Table 4. High-Temperature Creep Performance Test Results of Valve Shell Cast Specimens

[0038] The results show that the reinforcing phase is uniformly distributed in the valve body structure, with no obvious defects or inclusions found, and the high-temperature performance is good.

[0039] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A heat treatment method for reinforced high-temperature alloy castings, characterized in that, include: Molten alloy is poured into the sand box to solidify and form the casting. The sand box is then disassembled and the casting blank is removed while the casting is kept at a high temperature. Set the first heating rate and heat the casting blank in stages. When the composition of the casting becomes homogeneous, cool the casting to room temperature to obtain the semi-finished casting. The semi-finished casting is heated at a set second heating rate until it reaches the performance treatment temperature range, and the heated semi-finished casting is kept at the temperature to obtain a pure matrix with uniform composition and no brittle large particles. According to different cooling rates, the pure matrix is ​​cooled in stages until it is cooled to room temperature, thus obtaining a reinforced high-temperature alloy casting.

2. The heat treatment method for reinforced high-temperature alloy castings according to claim 1, characterized in that, The reinforced high-temperature alloy casting is made of nickel-iron based alloy and has an application temperature of 650℃~700℃. The mass fraction of Fe and Co in the alloy is controlled at 40%≤Fe<47% and 0.005%≤Co≤0.3%.

3. The heat treatment method for reinforced high-temperature alloy castings according to claim 2, characterized in that, The second heating rate is not less than the first heating rate.

4. The heat treatment method for reinforced high-temperature alloy castings according to claim 3, characterized in that, The process involves setting a first heating rate and performing segmented, step-by-step heating on the casting blank. Once the composition of the casting reaches homogenization, the casting is cooled to room temperature to obtain a semi-finished casting. Specifically: The high-temperature casting blank is fed into a programmable trolley furnace and heated at a constant heating rate of 25℃ / h. When the first heating range of 700℃ to 1100℃ is reached, it is held in sections at 200℃ intervals for 2.5 to 4 hours to release thermal stress in thick-walled castings. When the second heating range of 1100℃ to 1200℃ is reached, it is held in sections at 50℃ intervals for 4.5 to 5.5 hours to eliminate dendritic segregation. The temperature is then continuously increased to a homogenization final temperature of 1200℃ to 1210℃ and held at that temperature for 33 to 36 hours to achieve homogenization of the casting composition. After the homogenization holding is completed, the casting is cooled to room temperature at a furnace cooling rate of 10℃ to 15℃ / h to obtain a semi-finished casting.

5. The heat treatment method for reinforced high-temperature alloy castings according to claim 4, characterized in that, The process involves heating the semi-finished casting at a set second heating rate until it reaches the performance treatment temperature range, and then holding the heated semi-finished casting at that temperature to obtain a pure matrix with uniform composition and no brittle large particles. Specifically, the semi-finished casting cooled to room temperature is heated to the performance treatment temperature range of 1005℃ to 1020℃ at a heating rate of 25℃ / h to 35℃ / h, and held at that temperature for 6h to 10h. This process dissolves the coarse and brittle impurities in the semi-finished casting, resulting in a pure matrix with uniform composition and no brittle large particles.

6. The heat treatment method for reinforced high-temperature alloy castings according to claim 5, characterized in that, The process involves cooling the pure matrix in stages according to different cooling rates until it reaches room temperature, thereby obtaining a reinforced high-temperature alloy casting. Specifically, the pure matrix is ​​cooled to the first temperature zone (900℃~930℃) at a cooling rate of 10℃ / h~15℃ / h and held at that temperature for 2h~3h. After holding, the pure matrix in the first temperature zone is cooled to the second temperature zone (700℃~750℃) at a cooling rate of 70℃ / h~75℃ / h, thus passing through the sensitive range for the precipitation of harmful brittle phases and avoiding the formation of chain-like and blocky brittle phases. When cooled to 700℃~750℃, the cooling rate is switched again to 10℃ / h~15℃ / h to cool it to room temperature, thereby obtaining a reinforced nickel-iron-based high-temperature alloy casting.

7. The heat treatment method for reinforced high-temperature alloy castings according to claim 6, characterized in that, Before heating the casting blank in stages, the process also includes: after removing the high-temperature casting blank from the sand box, without air cooling or open-air transfer, the blank is directly sent into the programmable trolley furnace.

8. The heat treatment method for reinforced high-temperature alloy castings according to claim 7, characterized in that, The process of segmented and stepped heating of the casting blank, heating of the semi-finished casting at a set second heating rate, and phased cooling of the pure matrix relies on the temperature control system of the programmable trolley furnace itself to heat or cool the casting, ensuring that the cooling rate of the casting surface and the interior is synchronized, and is completed continuously in a closed loop within the same programmable trolley furnace.

9. A heat treatment method for reinforced high-temperature alloy castings according to claim 8, characterized in that, When the furnace temperature reaches the first heating range of 700℃ to 1100℃, it is kept warm in segments with a temperature interval of 200℃. The duration of each segment is 2.5h to 4h. Specifically, when the furnace temperature reaches 700℃ in the first heating range, a buffer heat preservation is performed every 200℃ increase. The duration of each segment is 2.5h to 4h until the furnace temperature reaches 1100℃.

10. A heat treatment method for reinforced high-temperature alloy castings according to claim 9, characterized in that, When the furnace temperature reaches the second heating range of 1100℃~1200℃, it is kept in sections with a temperature interval of 50℃, and the duration of each section is 4.5h~5.5h. Specifically, when the furnace temperature reaches 1100℃ in the second heating range, a buffer heat preservation is performed every 20℃ increase; the duration of each section is 4.5h~5.5h, until the furnace temperature reaches a homogeneous final temperature of 1200℃~1210℃, and after completing 33h~36h of homogeneous heat preservation, the temperature is lowered.

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