CN115927987A - Heat treatment method of high-temperature alloy disc shaft type forge piece and disc shaft type forge piece manufactured by same - Google Patents
Heat treatment method of high-temperature alloy disc shaft type forge piece and disc shaft type forge piece manufactured by same Download PDFInfo
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 77
- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 66
- 239000000956 alloy Substances 0.000 title claims abstract description 66
- 238000000034 method Methods 0.000 title claims abstract description 39
- 238000001816 cooling Methods 0.000 claims abstract description 115
- 230000032683 aging Effects 0.000 claims abstract description 16
- 238000005242 forging Methods 0.000 claims description 30
- 229910000601 superalloy Inorganic materials 0.000 claims description 22
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 10
- 229910052759 nickel Inorganic materials 0.000 claims description 5
- 238000004090 dissolution Methods 0.000 claims description 3
- 238000013316 zoning Methods 0.000 claims description 2
- 239000000243 solution Substances 0.000 abstract description 31
- 238000010008 shearing Methods 0.000 abstract description 6
- 239000006104 solid solution Substances 0.000 abstract description 6
- 230000035882 stress Effects 0.000 abstract description 6
- 238000010791 quenching Methods 0.000 description 13
- 230000000171 quenching effect Effects 0.000 description 13
- 230000000052 comparative effect Effects 0.000 description 9
- 238000005728 strengthening Methods 0.000 description 5
- 238000005192 partition Methods 0.000 description 4
- 239000011159 matrix material Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 101000912561 Bos taurus Fibrinogen gamma-B chain Proteins 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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- 239000000126 substance Substances 0.000 description 1
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Abstract
The invention relates to the technical field of high-temperature alloy heat treatment, in particular to a heat treatment method of a high-temperature alloy disc shaft type forge piece and the disc shaft type forge piece manufactured by the same. The method comprises the following steps: carrying out solution heat treatment on the high-temperature alloy disc shaft type forge piece to be treated, cooling, and carrying out aging heat treatment; in the cooling process, the air cooling in a subarea mode is firstly carried out, and then the oil cooling is carried out; in the subarea air cooling, except the area with the minimum section thickness, the air cooling wind speed V of the other areas meets the following requirements: v = k × α + b, α is an average value of the interfacial heat transfer coefficients of the respective regions at the start of air cooling; k is 0.185-0.195, b is 0.7-0.9. After solid solution, the invention adopts double media to cool, namely, the air cooling is controlled in a short time and in a subarea way, and then the oil cooling is carried out; before oil cooling, the air flow rates of different areas are controlled to generate a temperature gradient opposite to that of oil cooling, so that the temperature gradient of the workpiece after entering the oil is reduced, and the shearing stress and the like are reduced.
Description
Technical Field
The invention relates to the technical field of high-temperature alloy heat treatment, in particular to a heat treatment method of a high-temperature alloy disc shaft type forge piece and the disc shaft type forge piece manufactured by the same.
Background
The high-temperature alloy disc shaft type forged piece is the most important hot end bearing part in an aeroengine and a rocket engine, and the comprehensive mechanical property and the dimensional precision of the high-temperature alloy disc shaft type forged piece can obviously influence the performance of the engine. The aging strengthening type nickel-based high-temperature alloy is usually prepared by adopting the aging strengthening type nickel-based high-temperature alloy, and the structure and the performance of the aging strengthening type nickel-based high-temperature alloy are jointly determined by factors such as chemical components, a deformation process, a heat treatment process and the like. The heat treatment of age-strengthened nickel-base superalloys typically consists of a solution heat treatment, cooling after solution, and an aging heat treatment. The purpose of the solution treatment is to dissolve part or all of coarse gamma 'phase formed in the high-temperature alloy in the hot deformation process into the matrix, and the purpose of the aging heat treatment is to precipitate uniformly distributed gamma' phase in the gamma matrix so as to achieve the maximum strengthening effect of the alloy. The cooling speed after solid solution is an important factor influencing the size, the shape and the distribution rule of the gamma' phase.
At present, the solid solution cooling mode of the aging strengthening type nickel-based high-temperature alloy generally comprises oil quenching, salt quenching, air cooling and the like, and the interface heat exchange coefficients of all cooling media are different. The heat exchange coefficient of oil cooling at each temperature is large, the cooling effect is strong, but the heat exchange coefficient difference of different positions of the disc piece is not large, and the regulation and the control are difficult. Therefore, for the disc or the disc shaft part with large section thickness gradient variation, the temperature field difference of each part is large due to the structure and the shape, high-value shearing stress is easy to generate at the parts such as a hub, a spoke and the like, and finally, micro-cracks are generated to cause the disc to be scrapped. And the cooling capacity of air cooling, air cooling and other gas cooling media is weaker, and the mechanical property of the plate body with larger section thickness cannot meet the index requirement. Therefore, a heat treatment method suitable for high-temperature alloy disc parts and disc shaft type forged parts with large section thickness gradient change is urgently needed to be designed.
In view of the above, the present invention is particularly proposed.
Disclosure of Invention
The invention aims to provide a heat treatment method of a high-temperature alloy disc shaft type forging, which aims to solve the technical problem that the heat treatment method in the prior art is not suitable for the high-temperature alloy disc piece, the disc shaft type forging and the like with large section thickness gradient change.
The invention also aims to provide the high-temperature alloy disc shaft type forging piece prepared by the heat treatment method.
In order to achieve the above purpose of the present invention, the following technical solutions are adopted:
the heat treatment method of the high-temperature alloy disc shaft type forge piece comprises the following steps:
carrying out solution heat treatment on the high-temperature alloy disc shaft type forge piece to be treated, cooling, and carrying out aging heat treatment;
wherein, in the cooling, the partitioned air cooling is firstly carried out, and then the oil cooling is carried out;
in the subarea air cooling, except the area with the minimum section thickness, the air cooling wind speed V of the other areas meets the following requirements:
v = k × α + b, α is an average value of the interfacial heat transfer coefficients of the respective regions at the start of air cooling;
k is 0.185-0.195, b is 0.7-0.9.
In a specific embodiment of the present invention, k is 0.185 to 0.192.
In the specific implementation mode of the invention, the high-temperature alloy disc shaft type forging is divided into a plurality of areas according to the axial section thickness of the high-temperature alloy disc shaft type forging, the areas are named as A, B, … and N in sequence from small to large according to the section thicknesses, and the section thicknesses respectively correspond to h A 、h B 、…、h N (ii) a Air cooling is adopted in the area A, and when air cooling is started after the solution heat treatment, the average value alpha of the interfacial heat exchange coefficient of the area A A ＝20W/m 2 K, adjusting the air-cooled wind speed of the rest of the regions to make the average value alpha of the interface heat exchange coefficient of the corresponding region x ＝(h X /h A ) 2 ×α A (ii) a Wherein h is X Is the cross-sectional thickness of the corresponding region.
The heat exchange coefficient changes with the temperature of the interface, and the heat exchange coefficient refers to the corresponding heat exchange coefficient at the corresponding temperature after the solution heat treatment is finished.
In a specific embodiment of the invention, after the air cooling is finished, the section thickness of the high-temperature alloy disc shaft type forge piece is the smallest areaAverage temperature not lower than T s -30℃～T s -100 ℃ of which T s The solution heat treatment temperature.
In an embodiment of the present invention, the air cooling time t satisfies:
t≤c×(30～100℃)×h A ×ρ÷α A ÷(T s -20℃)；
wherein c is the high temperature alloy at T s Specific heat capacity at temperature, rho is the T of the superalloy s Density at temperature.
In a specific embodiment of the present invention, the air cooling time t is 30 to 180 seconds.
In a particular embodiment of the invention, the temperature T of the solution heat treatment s Is T γ’ -30℃～T γ’ +50 ℃; wherein, T γ’ Represents the dissolution temperature of the gamma' phase;
the time of the solution heat treatment is 2 to 6 hours.
In the specific embodiment of the invention, after the zoned air cooling is carried out, the oil cooling is carried out until the temperature is cooled to be below 100 ℃.
In a particular embodiment of the invention, the superalloy is an age-strengthened nickel-base superalloy. Further, the superalloy comprises any one of FGH96, GH4738, GH4251, and GH4720 Li.
In the specific embodiment of the invention, in the axial section of the disc shaft type forging, the ratio of the difference between the maximum thickness and the minimum thickness along the axial direction to the maximum thickness is more than or equal to 50%.
The invention also provides a high-temperature alloy disc shaft type forging piece manufactured by adopting any one of the heat treatment methods.
Compared with the prior art, the invention has the beneficial effects that:
(1) The invention combines the characteristics and advantages of liquid quenching medium (quenching oil) and gas quenching medium (accelerated air), adopts double media to cool after solid solution, firstly carries out short-time zone control air cooling, and then carries out oil cooling; before oil cooling, the air cooling is controlled in different areas, and the temperature gradient opposite to that of the oil cooling is generated by controlling the air flow rate of different areas, so that the temperature gradient of a workpiece after entering the oil is reduced, the shearing stress is reduced, and the like.
(2) The high-temperature alloy disc shaft type forge piece prepared by the invention has a complete structure and meets the requirements on the structure performance.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic axial cross-sectional view of a superalloy disc shaft forging according to an embodiment of the present invention;
FIG. 2 is a schematic axial cross-sectional view of a superalloy disk provided in example 1 of the present invention;
FIG. 3 is a schematic axial cross-sectional view of a superalloy disk shaft provided in example 2 of the present invention.
Detailed Description
The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings and the detailed description, but those skilled in the art will understand that the following described embodiments are some, not all, of the embodiments of the present invention, and are only used for illustrating the present invention, and should not be construed as limiting the scope of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are conventional products which are not indicated by manufacturers and are commercially available.
The interface heat exchange coefficient in the invention refers to the heat exchange coefficient between the corresponding interface and the corresponding quenching medium.
In the prior art, in the solid solution cooling treatment of the high-temperature alloy forged piece with a variable section, the cooling speed of the central part of the forged piece is low, so that the requirements of the structure and the performance after heat treatment are difficult to meet, or the shearing stress generated in the oil cooling process is difficult to reduce.
The heat treatment method of the high-temperature alloy disc shaft type forge piece comprises the following steps:
carrying out solution heat treatment on the high-temperature alloy disc shaft type forge piece to be treated, cooling, and carrying out aging heat treatment;
wherein, in the cooling, the zoning air cooling is firstly carried out, and then the oil cooling is carried out;
in the subarea air cooling, except the area with the minimum section thickness, the air cooling wind speed V of the other areas meets the following requirements:
v = k × α + b, α is an average value of the interfacial heat transfer coefficients of the respective regions at the start of air cooling;
k is 0.185-0.195, b is 0.7-0.9.
The invention combines the characteristics and advantages of liquid quenching medium (quenching oil) and gas quenching medium (accelerated air), adopts double media to cool after solid solution, firstly carries out short-time zone control air cooling, and then carries out oil cooling. Before oil cooling, the air cooling is controlled in different areas, and the temperature gradient opposite to that of the oil cooling is generated by controlling the air flow rate of different areas, so that the temperature gradient of a workpiece after entering the oil is reduced, the shearing stress is reduced, and the like.
As in various embodiments, k can be illustratively 0.185, 0.186, 0.187, 0.188, 0.189, 0.19, 0.191, 0.19176, 0.192, 0.193, 0.194, 0.195, etc., preferably 0.185 to 0.192.
As in various embodiments, b can be illustratively 0.7, 0.71, 0.72, 0.73, 0.74, 0.75, 0.76, 0.77, 0.78, 0.79, 0.8, 0.80256, 0.81, 0.82, 0.83, 0.84, 0.85, 0.86, 0.87, 0.88, 0.89, 0.9, and the like.
Wherein, in V = k × α + b, the unit of V is m/s, and the unit of α is W/m 2 ·K。
In an embodiment of the present invention, the air-cooled wind speed V satisfies: v =0.19176 × α +0.80256.
In the specific implementation mode of the invention, the high-temperature alloy disc shaft type forging is divided into a plurality of areas according to the axial section thickness of the high-temperature alloy disc shaft type forging, the areas are named as A, B, … and N in sequence from small to large according to the section thicknesses, and the section thicknesses respectively correspond to h A 、h B 、…、h N (ii) a Air cooling is adopted in the area A, and when air cooling is started after the solution heat treatment, the average value alpha of the interface heat exchange coefficient of the area A A ＝20W/m 2 K, adjusting the air-cooled wind speed of the rest of the regions to make the average value alpha of the interface heat exchange coefficients of the corresponding regions x ＝(h X /h A ) 2 ×α A (ii) a Wherein h is X Is the cross-sectional thickness of the corresponding region.
For example, the average value α of the heat transfer coefficient of the interface corresponding to the B region B ＝(h B /h A ) 2 ×α A Average value of heat transfer coefficient of interface of N region N ＝(h N /h A ) 2 ×α A 。
Wherein, the air cooling adopted in the area A means that the wind speed is 0m/s.
For the high-temperature alloy after the solution heat treatment temperature treatment, the average value of the interfacial heat transfer coefficient of the A area is basically 20W/m 2 K is about 20W/m 2 ·K。
As shown in fig. 1, which is a schematic cross-sectional view of a superalloy disc shaft forging provided in an embodiment of the present invention along an axial direction. According to the schematic cross-sectional view of the high-temperature alloy disc shaft type forging, the high-temperature alloy disc shaft type forging is divided into a plurality of regions according to the cross-sectional thickness along the axial direction. As shown in fig. 1, the high-temperature alloy disc shaft type forging is divided into two areas, wherein the two areas are respectively provided with a section thickness of h A Has a cross-sectional thickness of h B And (3) region B.
In the region A, the corresponding interface heat exchange coefficients refer to the upper end surface and the lower end surface alpha of the same thickness region as shown in FIG. 1 A Face and alpha A ' side; in the B region, the corresponding interface heat transfer coefficients refer to the upper end surface and the lower end surface alpha of the same thickness region as shown in FIG. 1 B Face and alpha B ' side of the plane.
FIG. 1 is a schematic view of a high-temperature alloy disc shaft type forged piece with two different section thicknesses, but the invention is not limited to the high-temperature alloy disc shaft type forged piece with a plurality of different section thicknesses, and the heat treatment method of the invention is also applicable to the high-temperature alloy disc shaft type forged piece with a plurality of different section thicknesses.
In a specific embodiment of the invention, after the air cooling is finished, the average temperature of the area with the smallest section thickness of the high-temperature alloy disc shaft type forge piece is not lower than T s -30℃～T s -100 ℃ of which T s The solution heat treatment temperature.
In different embodiments, after the air cooling is finished, the average temperature corresponding to the area with the minimum section thickness of the high-temperature alloy disc shaft type forge piece, namely the area A, is not lower than T s -30℃、T s -40℃、T s -50℃、T s -60℃、T s -70℃、T s -80℃、T s -90 ℃ or T s -100 ℃ and the like.
In an embodiment of the present invention, the air cooling time t satisfies:
t≤c×(30～100℃)×h A ×ρ÷α A ÷(T s -20℃)；
wherein alpha is A ＝20W/m 2 ·K；h A Is the cross-sectional thickness of the region A, in mm; c is the high temperature alloy at T s The specific heat capacity at temperature in J/(kg & K); rho is the high-temperature alloy at T s Density at temperature in g/cm 3 。
According to the shape and the size of the high-temperature alloy disc shaft type forging, the sectional thickness is mainly adopted, and the time of zone air cooling matched with the sectional thickness is adopted.
In a preferred embodiment of the present invention, the air-cooling time t satisfies:
t≤c×(30～50℃)×h A ×ρ÷α A ÷(T s -20℃)。
in a specific embodiment of the present invention, the air cooling time t is 30 to 180 seconds.
As in the different embodiments, the air-cooling time t may be exemplarily 30s, 40s, 50s, 60s, 70s, 80s, 90s, 100s, 110s, 120s, 130s, 140s, 150s, 160s, 170s, 180s, and the like.
In a specific embodiment of the invention, the temperature T of the solution heat treatment s Is T γ’ -30℃～T γ’ +50 ℃; wherein, T γ’ Represents the dissolution temperature of the gamma' phase;
the time of the solution heat treatment is 2 to 6 hours.
As in various embodiments, the temperature T of the solution heat treatment s May be exemplified by T γ’ -30℃、T γ’ -20℃、T γ’ -10℃、T γ’ 、T γ’ +10℃、T γ’ +20℃、T γ’ +30℃、T γ’ +40℃、T γ’ +50 ℃ and the like; the time of the solution heat treatment may be exemplified by 2h, 3h, 4h, 5h, 6h, and the like.
The above solution heat treatment temperatures are used to ensure that the gamma' phase is partially or completely dissolved into the gamma matrix.
In the specific embodiment of the invention, after the zoned air cooling is carried out, the oil cooling is carried out until the temperature is cooled to be below 100 ℃.
In actual practice, the aging heat treatment is carried out according to the conventional aging heat treatment regime for the superalloy.
In a particular embodiment of the invention, the superalloy is an age-strengthened nickel-base superalloy. Further, the superalloy comprises any one of FGH96, GH4738, GH4251, and GH4720 Li.
In the specific implementation mode of the invention, in the axial section of the disc-shaft type forging, the ratio of the difference between the maximum thickness and the minimum thickness along the axial direction to the maximum thickness is more than or equal to 50%. I.e. (h) N -h A )/h N ≥50％。
The heat treatment method is suitable for high-temperature alloy disc shaft type forgings with large section thickness gradient change.
The invention also provides a high-temperature alloy disc shaft type forging piece manufactured by adopting any one of the heat treatment methods.
Example 1
The embodiment provides a heat treatment method of an FGH96 superalloy disk, which comprises the following steps:
(1) The superalloy disk is shown in FIG. 2 in an axial cross-sectional view, wherein the thickness h of region A A 60mm, thickness h of the B region B Is 150mm; and carrying out solution heat treatment on the disc piece at 1150 +/-10 ℃ for 4h.
(2) Carrying out partition air cooling on the disc after the solution heat treatment in the step (1), transferring the disc into quenching oil, and cooling the disc to be below 100 ℃;
the subarea air cooling is carried out by selecting the matched wind speed of the subarea air cooling according to the shape and the size (section thickness) of the disc. Cooling the area A by air cooling, wherein the average value of the corresponding interface heat exchange coefficient is alpha A ＝20W/m 2 K; interfacial heat transfer coefficient alpha of B region B ＝(h B /h A ) 2 ×α A ＝125W/m 2 K, wind speed was calculated from V =0.19176 × α +0.80256, and wind speed was set to 24 to 25m/s.
And the partition air cooling time is selected according to the shape and the size of the disc. The specific heat capacity c = 720J/(kg.K) of the FGH96 alloy in a high-temperature section and the density is 8.14g/cm 3 (ii) a According to t is less than or equal to c x (30-100 ℃) x h A ×ρ÷α A ÷(T s -20 ℃) and the air cooling time was chosen to be 120s.
(3) And (3) carrying out aging heat treatment on the forged piece cooled in the step (2), wherein the aging heat treatment comprises the following steps: 760 ℃/16h, and air cooling to room temperature.
Example 2
The embodiment provides a heat treatment method of a GH4738 high-temperature alloy disk shaft, which comprises the following steps:
(1) A schematic axial cross-section of the superalloy disk shaft is shown in FIG. 3, where the thickness h in area A is A Is 40mm, and the thickness h of the B region B Is 100mm, and the thickness h of the C region C Is 160mm; the disc shaft is subjected to solution heat treatment for 4h at 1025 +/-10 ℃.
(2) Carrying out partition air cooling on the disc shaft member subjected to the solution heat treatment in the step (1), transferring the disc shaft member into quenching oil, and cooling the disc shaft member to be below 100 ℃;
and selecting the wind speed of the zone air cooling matched with the forged piece according to the shape and the size (section thickness) of the forged piece. Cooling the region A by air cooling, wherein the average value of the corresponding interface heat exchange coefficients is alpha A ＝20W/m 2 K; interfacial heat transfer coefficient alpha of B region B ＝(h B /h A ) 2 ×α A ＝125W/m 2 K, calculating a wind speed from V =0.19176 × α +0.80256, the wind speed being set to 24 to 25m/s; interfacial heat transfer coefficient alpha of C region C ＝(h C /h A ) 2 ×α A ＝320W/m 2 K, wind speed was calculated from V =0.19176 × α +0.80256, and wind speed was set to 60 to 63m/s.
And the partition air cooling time is selected according to the shape and the size of the disc. The specific heat capacity c = 710J/(kg. K) of the GH4738 alloy in a high-temperature section and the density is 8.22g/cm 3 (ii) a According to t is not more than c x (30-100 ℃) x h A ×ρ÷α A ÷(T s -20 ℃) and the air-cooling time was chosen to be 150s.
(3) And (3) carrying out aging heat treatment on the forged piece subjected to cooling treatment in the step (2), wherein the aging heat treatment comprises the following steps: 845 ℃/4h, air-cooling to room temperature, 760 ℃/16h, and air-cooling to room temperature.
Example 3
This example refers to the heat treatment method of example 2, with the only difference that: in the step (2), the air cooling time is 600s.
Comparative example 1
Comparative example 1 the heat treatment method of example 1 was referred to, except that: in the step (2), the wind speed in the B area is 100m/s.
Comparative example 2
Comparative example 2 the heat treatment method of example 1 was referred to, except that: the cooling manner in the step (2) is different.
The cooling method of comparative example 2 was: transferring the disc after the solution heat treatment into quenching oil, and cooling to below 100 ℃.
Comparative example 3
Comparative example 3 the heat treatment method of example 2 was referenced, except that: the cooling manner in the step (2) is different.
The cooling method of comparative example 3 was: transferring the disc after the solution heat treatment into quenching oil, and cooling to below 100 ℃.
Experimental example 1
The heat treatment methods of the different examples and comparative examples were compared and the results are shown in table 1.
TABLE 1 comparison of different heat treatment methods
Remarking: the average cooling speed of the central part of the hub of the FGH96 alloy disk piece is measured to be the average cooling speed within the range of 1080-850 ℃; the average cooling rate of the hub center part of the GH4738 alloy disk shaft member was measured at an average cooling rate in the range of 950 to 700 ℃.
According to the test results, the heat treatment method disclosed by the invention is characterized in that the air cooling is controlled in different areas before the oil cooling, and the temperature gradient opposite to the oil cooling is generated by controlling the air flow rates of different areas, so that the temperature gradient of the workpiece after the oil entering is reduced, the shearing stress is reduced, and finally the high-temperature alloy forging with a complete structure and the structure performance meeting the requirements is prepared.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and these modifications or substitutions do not depart from the spirit of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. The heat treatment method of the high-temperature alloy disc shaft type forge piece is characterized by comprising the following steps of:
carrying out solution heat treatment on the high-temperature alloy disc shaft type forge piece to be treated, cooling, and carrying out aging heat treatment;
wherein, in the cooling, the zoning air cooling is firstly carried out, and then the oil cooling is carried out;
in the subarea air cooling, except the area with the minimum section thickness, the air cooling wind speed V of the other areas meets the following conditions:
v = k × α + b, α is an average value of the interfacial heat transfer coefficients of the respective regions at the start of air cooling;
k is 0.185-0.195, b is 0.7-0.9.
2. The heat treatment method of the high-temperature alloy disc shaft type forged piece according to claim 1, wherein the high-temperature alloy disc shaft type forged piece is divided into a plurality of areas according to the axial section thickness of the high-temperature alloy disc shaft type forged piece, the areas are named A, B, … and N in sequence from small to large according to the section thicknesses, and the section thicknesses respectively correspond to h A 、h B 、…、h N (ii) a Air cooling is adopted in the area A, and when air cooling is started after the solution heat treatment, the average value alpha of the interface heat exchange coefficient of the area A A ＝20W/m 2 K, adjusting the air-cooled wind speed of the rest of the regions to make the average value alpha of the interface heat exchange coefficients of the corresponding regions x ＝(h X /h A ) 2 ×α A (ii) a Wherein h is X Is the cross-sectional thickness of the corresponding region.
3. The heat treatment method of the high-temperature alloy disc shaft type forge piece according to claim 2, wherein after the air cooling is finished, the average temperature of the area with the smallest section thickness of the high-temperature alloy disc shaft type forge piece is not lower than T s -30℃～T s -100 ℃ of which T s The solution heat treatment temperature.
4. The heat treatment method of the high-temperature alloy disc shaft type forging piece according to claim 3, wherein the air cooling time t is as follows:
t≤c×(30～100℃)×h A ×ρ÷α A ÷(T s -20℃)；
wherein c is the high temperature alloy at T s Specific heat capacity at temperature, rho is the T of the superalloy s Density at temperature.
5. The heat treatment method for the high-temperature alloy disc shaft type forging piece according to claim 1, wherein the air cooling time t is 30-180 s.
6. The method of heat treating a superalloy disc shaft forging as claimed in claim 1, wherein the temperature T of the solution heat treatment is s Is T γ’ -30℃～T γ’ +50 ℃; wherein, T γ’ The dissolution temperature of the gamma' phase;
preferably, the time of the solution heat treatment is 2 to 6 hours.
7. The heat treatment method for the high-temperature alloy disc shaft type forging piece according to claim 1, wherein after the zoned air cooling, the oil cooling is carried out until the temperature is cooled to be below 100 ℃.
8. The heat treatment method of a superalloy disc shaft forging according to claim 1, wherein the superalloy is an age-strengthened nickel-based superalloy;
preferably, the superalloy comprises any of FGH96, GH4738, GH4251 and GH4720 Li.
9. The heat treatment method of the high-temperature alloy disc shaft type forging piece according to claim 1, wherein in the axial section of the disc shaft type forging piece, the ratio of the difference between the maximum thickness and the minimum thickness along the axial direction to the maximum thickness is not less than 50%.
10. The high-temperature alloy disc shaft type forging piece manufactured by adopting the heat treatment method of the high-temperature alloy disc shaft type forging piece according to any one of claims 1 to 9.
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