Preparation method of super-large-specification ring piece capable of resisting temperature of 800 DEG C

Abstract

The invention relates to the technical field of rolling of high-temperature alloy ring forgings, particularly discloses a preparation method of an ultra-large-specification ring piece capable of resisting the temperature of 800 DEG C, and solves the problems that due to the fact that the size of the ring forgings is increased through alloy, cracking is prone to occurring, and the structure property control difficulty is large. The preparation method comprises the following steps that an alloy bar is cut and blanked according to the feeding weight of the ring forge piece, upsetting and punching are conducted on the bar after heat preservation treatment is conducted on the bar at the temperature of 1000-1150 DEG C, trestle chambering is conducted on a cake blank after heat preservation treatment is conducted on the cake blank at the temperature of 1000-1150 DEG C, rolling is conducted after heat preservation treatment is conducted on the cake blank at the temperature of 1000-1150 DEG C, and an alloy forge piece blank is obtained; and then standard heat treatment is conducted, and finally the GH4586 alloy ring forge piece with the diameter ranging from 400 mm to 1600 mm is obtained. According to the preparation process, the cracking tendency of the ring forge piece is greatly reduced, a uniform structure is obtained, and the comprehensive performance of the GH4586 large-size ring forge piece is guaranteed.

Description

Technical Field

[0001] The present application relates to the technical field of rolling high-temperature alloy ring forgings, and in particular to a method for preparing an ultra-large-sized ring with a temperature resistance of 800°C. Background Art

[0002] GH4586 alloy is a highly alloyed nickel-based deformable high-temperature alloy independently developed in my country. It has a temperature resistance of 850°C and good comprehensive mechanical properties. It is mainly used for high-temperature rotating disk forgings of engines such as aerospace rockets and hypersonic torpedoes.

[0003] With the development of new engines, it is urgent to develop the preparation process of large-size ring forgings of GH4586 alloy. Since the content of precipitation strengthening phase γ′ phase of GH4586 alloy is close to 30%, and the content of solid solution strengthening elements Mo+W elements exceeds 11%, it is a difficult-to-deform high-temperature alloy and is prone to cracks during hot working. The alloy contains a certain amount of MC, M6C, M 23 Carbides such as C6 are prone to carbide aggregation due to improper hot working technology, resulting in poor uniformity of organizational properties. Cracks and uneven organization are very likely to occur during the rolling process, which brings great difficulties to the preparation process.

[0004] Therefore, it is urgently necessary to develop a preparation method for large-size ring forgings of GH4586 alloy based on existing domestic equipment, and to trial-produce large-size ring forgings that meet size and performance requirements. Summary of the invention

[0005] The purpose of the present invention is to provide a method for preparing ultra-large-sized rings resistant to 800°C temperature, so as to solve the technical problems existing in the existing technology that the preparation process cannot ensure that the large-sized ring forgings have uniform structure, are not prone to cracking, and have stable comprehensive performance.

[0006] In a first aspect, the present invention provides a method for preparing a GH4586 large-size ring forging, comprising sequentially performing the following steps: The GH4586 alloy bars are cut and cut according to the weight of the ring forgings, and the cut bars are subjected to heat preservation treatment at 1000-1150°C, and then upsetting and punching are performed to obtain cake blanks; The blank is heat treated at 1000-1150°C, then expanded by a rack, and then pre-rolled and final rolled after heat treatment at 1000-1150°C to obtain a GH4586 ring forging blank; In the horse rack hole expansion process: the blank spacing is ≥30mm, stacking is not allowed, the heating temperature is 1000-1150°C, the insulation time is 2-4h, the ring blank horse rack hole expansion is completed according to 1-3 turns, and the total deformation is 15%-25%; Then, solution heat treatment and aging heat treatment are carried out to finally obtain large-size ring forgings of GH4586 alloy.

[0007] The technical solution provided in this application analyzes the changes in temperature field and strain field (such as Figure 1-2 As shown), combined with on-site equipment to control the key process parameters in the forging process of large-size ring forgings, control the uniformity of the organization, clarify the rolling process window and accurately control the process parameters, thereby improving the yield rate of GH4586 alloy super-large-size ring forgings and reducing the economic cost; and the technical solution provided in this application is used to prepare GH4586 large-size ring forgings, and the forgings have excellent mechanical properties.

[0008] The parameters of the horse frame hole expansion are as follows: the spacing between the blanks is ≥30 mm, stacking is not allowed, the heating temperature is 1000-1150° C., the insulation time is 2-4 hours, the hole expansion is completed in 1-3 turns, and the total deformation is 15%-25%.

[0009] Preferably, when the bar material is heated, the distance between the blanks is ≥30 mm, stacking is not allowed, the heating temperature is 1000-1150° C., and the insulation time is 2-3.5 h.

[0010] Preferably, when the bar material is heated, the spacing between the blanks is ≥30 mm, stacking is not allowed, the heating temperature is 1020-1150° C., and the insulation time is 2-3 hours.

[0011] Preferably, during the bar blank upsetting, the deformation amount is 50% to 70%, and the surface temperature of the ring forging is not less than 900° C. after the bar blank upsetting and punching are completed.

[0012] Preferably, the bar blank is deformed by upsetting by 50% to 60%, and the surface temperature of the ring forging is not less than 900° C. after the bar is upset and punched.

[0013] In the horse rack hole expansion process: the spacing between the heated ring blanks is ≥30mm, stacking is not allowed, the heating temperature is 1020-1100°C, and the insulation time is 2.5-3.5h; the ring blank horse rack hole expansion is completed according to 1-3 turns, and the total deformation is 18%-22%.

[0014] Preferably, in the pre-rolling process, the ring billet heating temperature is 1000-1150°C, the holding time is 1-3h, the billet spacing is ≥30mm; the core roller temperature is greater than 200°C, the rolling time is ≤240s, the transfer time is ≤90s, and the rolling deformation is 15-30%.

[0015] Preferably, in the pre-rolling process, the ring billet heating temperature is 1020-1150°C, the holding time is 1.5-2.5h, the billet spacing is ≥30mm; the core roller temperature is greater than 200°C, the rolling time is ≤180s, the transfer time is ≤90s, and the rolling deformation is 15-25%.

[0016] Preferably, in the final forging process, the heating temperature is 1000-1150° C., the holding time is 1-3 hours, the spacing between the billets is ≥30 mm, and stacking is not allowed.

[0017] Preferably, in the final forging process, the heating temperature is 1020-1150° C., the holding time is 1-3 hours, the spacing between the billets is ≥30 mm, and stacking is not allowed.

[0018] Preferably, in the final forging process, the core roll temperature is greater than 200° C., the rolling time is ≤180 s, the transfer time is ≤90 s, and the rolling deformation is 20-30%.

[0019] Preferably, in the final forging process, the core roll temperature is greater than 200° C., the rolling time is ≤150 s, the transfer time is ≤90 s, and the rolling deformation is 20-25%.

[0020] Preferably, the solution heat treatment of the GH4586 alloy ring forging includes: insulation treatment at 1050-1100° C. for 2-6 hours.

[0021] Preferably, the solution heat treatment of the GH4586 alloy ring forging comprises: heat preservation treatment at 1050-1080° C. for 2-6 hours, and oil cooling to room temperature.

[0022] Preferably, the aging heat treatment of the GH4586 alloy ring forging comprises: keeping at 700-850° C. for 2-16 hours, and air cooling to room temperature.

[0023] Preferably, the aging heat treatment of the GH4586 alloy ring forging comprises: keeping at 750-850° C. for 8-16 hours, and air cooling to room temperature.

[0024] In a second aspect, the present application provides a GH4586 large-size ring forging, which is prepared using the above-mentioned preparation method.

[0025] Specifically, the diameter of the GH4586 alloy large-size ring forging is 400-1600 mm; the element composition of the GH4586 large-size ring forging, by weight percentage, is: Cr: 18-20%, Co: 10-12%, Mo: 7-9%, W: 2-4%, Al: 1.3-1.8%, Ti: 2.9-3.5%, B: 0.003-0.01%, Fe: 0.005-2%, C: 0.01-0.08%, Mg: 0.01-0.05%, Zr: 0-1.5%, and the balance is Ni and unavoidable impurities; the weight percentage content of Mo+W is ≥11%.

[0026] Through the above technical scheme, under the original preparation process conditions, the present application appropriately adjusts key process parameters such as deformation temperature, deformation rate and deformation amount through Deform simulation calculation and repeated verification, thereby improving the thermoplasticity of the bar, reducing the cracking tendency during hot working, and ensuring the uniformity of the organization of the ring forging, thereby creating conditions for the preparation of large-size ring forgings of GH4586 alloy.

[0027] In summary, the technical solution of this application has the following effects: The technical solution provided in this application can open up the preparation process of super-large ring forgings of GH4586 alloy, master the key parameters in the forging process of large-size ring forgings, control the uniformity of the structure, clarify the mechanism of microstructure evolution in the forging process, clarify the rolling process window and accurately control the process parameters, improve the yield rate of super-large ring forgings of GH4586 alloy, and reduce economic costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a strain field simulation diagram of the GH4586 alloy ring forging preparation process in this application.

[0029] Figure 2 This is a stress field simulation diagram of the GH4586 alloy ring forging preparation process in this application.

[0030] Figure 3 This is the metallographic structure diagram (100X) of the GH4586 large-size ring forging in Example 1.

[0031] Figure 4 This is the metallographic structure diagram (200X) of the GH4586 large-size ring forging in Example 1. DETAILED DESCRIPTION

[0032] The technical scheme of the present invention will be clearly and completely described below in conjunction with specific embodiments. The embodiments described below are part of the embodiments of the present invention, rather than all of the embodiments, and are only used to illustrate the present invention, and should not be considered as limiting the scope of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present invention. The present application is further described in detail below in conjunction with embodiments, comparative examples and performance testing tests, and these embodiments cannot be construed as limiting the scope of protection claimed in the present application.

[0033] The preparation method of GH4586 large-size ring forgings includes the following steps: (1) Cutting: Cut the GH4586 alloy bar into pieces according to the weight of the ring forging to obtain bars of appropriate size and weight.

[0034] (2) Bar heating: When heating the bar, the spacing between the blanks is ≥30 mm, and stacking is not allowed. The heating temperature is 1000-1150°C and the holding time is 2-3.5 hours.

[0035] (3) Upsetting + punching: The punch and anvil should be preheated in advance, the preheating temperature should be above 200℃, the upsetting deformation of the bar blank should be 50% to 70%, and the surface temperature of the ring forging should not be lower than 900℃ after the bar is upset and punched.

[0036] (4) Ring blank heating + horse rack expansion: The spacing between the ring blanks during heating is ≥30 mm, and stacking is not allowed. The heating temperature is 1000-1150°C, the insulation time is 2-4 hours, and the horse rack expansion is completed in 1-3 turns. The total deformation is 15%-25%.

[0037] (5) Ring billet heating + pre-rolling: the ring billet heating temperature is 1000-1150°C, the holding time is 1-3h, the billet spacing is ≥30mm, the core roller temperature in the pre-rolling process is greater than 200°C, the rolling time is ≤240s, the transfer time is ≤90s, and the rolling deformation is 15-30%.

[0038] (6) Ring billet heating + final rolling: Ring billet heating temperature 1000 ~ 1150 ℃, holding time 1 ~ 3h, billet spacing ≥ 30mm, stacking is not allowed, core roll temperature greater than 200 ℃, rolling time ≤ 180s, transfer time ≤ 90s, rolling deformation 20 ~ 30%.

[0039] (7) Solution + aging heat treatment: The solution heat treatment of ring forgings is 1050-1100℃ for 2-6h, and the aging heat treatment is 700-850℃ for 2-16h.

[0040] The present application is further described in detail below in combination with embodiments, performance testing and accompanying drawings. Example

[0041] Example 1 Example 1 provides a GH4586 large-size ring forging and a preparation method thereof.

[0042] The preparation method of the GH4586 large-size ring forging in this embodiment specifically includes the following steps: Cutting, bar heating, upsetting and punching, ring blank heating, rack expansion, ring blank heating, pre-rolling, ring blank heating, final rolling, heat treatment; (1) Cutting The blanking specification is 300×290mm bar blank, with both end faces chamfered R15.

[0043] (2) Billet heating The rods should be loaded into the furnace within the effective heating area, with a spacing of 40 mm between the billets. Stacking is not allowed. The heating temperature is 1080°C and the holding time is 3.5 h.

[0044] (3) Upsetting + Punching The punch and anvil should be preheated in advance, and the preheating temperature is 205℃; after the ring blank is heated and kept warm, it is taken out of the furnace for upsetting + punching. The upsetting size is 100±5mm, and the punching is done with a 210mm punch.

[0045] (4) First fire ring blank heating + horse rack hole expansion The ring billet loading furnace should be within the effective area of ​​the heating furnace, with a billet spacing of 40mm, and stacking is not allowed. The heating temperature is 1080℃ and the insulation time is 3h. After heating and insulation, the billet is taken out of the furnace for hole expansion, which is completed in 3 circles, with a total deformation of 23%.

[0046] (5) Second fire ring blank heating + horse rack hole expansion The ring billet loading furnace should be within the effective area of ​​the heating furnace, the billet spacing is 40mm, stacking is not allowed, the heating temperature is 1080℃, and the insulation time is 3h; after heating and insulation, the billet is taken out of the furnace for hole expansion, and the hole expansion is completed in 3 circles, with a total deformation of 20%.

[0047] (6) First fire ring billet heating + pre-rolling The ring billet should be loaded into the effective area of ​​the heating furnace, with a billet spacing of 40mm, and stacking is not allowed. The heating temperature is 1080℃ and the holding time is 2h. Then the ring billet is rolled out of the furnace, with the core roller temperature of 206℃, the core roller specification of 220-320mm, the rolling time of 145s, the transfer time of 53s, and the rolling deformation of 22%.

[0048] (7) Second fire ring billet heating + pre-rolling The ring billet should be loaded into the effective area of ​​the heating furnace, with a billet spacing of 40mm, and stacking is not allowed. The heating temperature is 1080℃ and the holding time is 2h. Then the ring billet is rolled out of the furnace, with the core roller temperature of 205℃, the core roller specification of 220-320mm, the rolling time of 139s, the transfer time of 54s, and the rolling deformation of 23%.

[0049] (8) Ring billet heating + final rolling The ring billet should be loaded into the effective area of ​​the heating furnace, with a billet spacing of 40mm, and stacking is not allowed. The heating temperature is 1080℃ and the insulation time is 1.5h. Then the ring billet is rolled out of the furnace, with the core roller temperature of 203℃, the core roller specification of 220-320mm, the rolling time of 147s, the transfer time of 55s, and the rolling deformation of 20%.

[0050] (9) Solution heat treatment + aging heat treatment The ring billet should be loaded into the effective zone of the heating furnace, the solution treatment heating temperature is 1080℃, the holding time is 4h, and the oil cooling is to room temperature. The aging heat treatment heating temperature is 760℃, the holding time is 8h, and the air cooling is to room temperature.

[0051] In this embodiment, the GH4586 large-size ring forging has the following elemental composition by weight percentage: Cr: 19.2%, Co: 10.3%, Mo: 8.6%, W: 2.7%, Al: 1.5%, Ti: 3.1%, B: 0.008%, Fe: 0.015%, C: 0.05%, Mg: 0.03%, Zr: 0.8%, and the remainder is Ni and unavoidable impurities; the weight percentage content of Mo+W is ≥11%.

[0052] The obtained GH4586 alloy forgings were tested, and the test results are shown in Table 1.

[0053] Example 2 Example 2 provides a GH4586 large-size ring forging and a preparation method thereof.

[0054] The above embodiment is different from embodiment 1 in that: the preparation method of GH4586 large-size ring forgings includes heating of bar material, heating of first fire ring blank + horse rack expansion, heating of second fire ring blank + horse rack expansion, heating of first fire ring blank + pre-rolling, heating of second fire ring blank + pre-rolling, heating of ring blank + final rolling. The details are as follows. The remaining process parameters in this embodiment are the same as those in embodiment 1.

[0055] (1) Cutting The blanking specification is 300×290mm bar blank, with both end faces chamfered R15.

[0056] (2) Billet heating The rods should be loaded into the furnace within the effective heating area, with a spacing of 40 mm between the billets. Stacking is not allowed. The heating temperature is 1070°C and the holding time is 3.5 h.

[0057] (3) Upsetting + Punching The punch and anvil should be preheated in advance, and the preheating temperature is 205℃; after the ring blank is heated and kept warm, it is taken out of the furnace for upsetting + punching. The upsetting size is 100±5mm, and the punching is done with a 210mm punch.

[0058] (4) First fire ring blank heating + horse rack hole expansion The ring billet loading furnace should be within the effective area of ​​the heating furnace, with a billet spacing of 40mm, and stacking is not allowed. The heating temperature is 1070℃ and the insulation time is 3h. After heating and insulation, the billet is taken out of the furnace for hole expansion, which is completed in 3 circles, with a total deformation of 23%.

[0059] (5) Second fire ring blank heating + horse rack hole expansion The ring billet loading furnace should be within the effective area of ​​the heating furnace, with a billet spacing of 40mm, and stacking is not allowed. The heating temperature is 1070℃ and the insulation time is 3h. After heating and insulation, the billet is taken out of the furnace for hole expansion, which is completed in 3 circles with a total deformation of 20%.

[0060] (6) First fire ring billet heating + pre-rolling The ring billet should be loaded into the effective area of ​​the heating furnace, with a billet spacing of 40mm, and stacking is not allowed. The heating temperature is 1070℃ and the holding time is 2h. Then the ring billet is rolled out of the furnace, with the core roller temperature of 206℃, the core roller specification of 220-320mm, the rolling time of 141s, the transfer time of 57s, and the rolling deformation of 22%.

[0061] (7) Second fire ring billet heating + pre-rolling The ring billet should be loaded into the effective area of ​​the heating furnace, with a spacing of 40mm between billets, and stacking is not allowed. The heating temperature is 1070℃ and the holding time is 2h. Then the billet is rolled out of the furnace, with the core roller temperature of 205℃, the core roller specification of 220-320mm, the rolling time of 145s, the transfer time of 51s, and the rolling deformation of 23%.

[0062] (8) Ring billet heating + final rolling The ring billet should be loaded into the effective area of ​​the heating furnace, with a billet spacing of 40mm, and stacking is not allowed. The heating temperature is 1070℃ and the holding time is 1.5h. Then the ring billet is rolled out of the furnace, with the core roller temperature of 203℃, the core roller specification of 220-320mm, the rolling time of 140s, the transfer time of 51s, and the rolling deformation of 20%.

[0063] (9) Solution heat treatment + aging heat treatment The ring billet should be loaded into the effective zone of the heating furnace, the solution treatment heating temperature is 1080℃, the holding time is 4h, and the oil cooling is to room temperature. The aging heat treatment heating temperature is 760℃, the holding time is 8h, and the air cooling is to room temperature.

[0064] The obtained GH4586 alloy forgings were tested, and the test results are shown in Table 1.

[0065] Example 3 Example 3 provides a GH4586 large-size ring forging and a preparation method thereof.

[0066] The above embodiment is different from embodiment 1 in that: the first fire ring blank heating + horse rack expansion, the second fire ring blank heating + horse rack expansion, the first fire ring blank heating + pre-rolling, the second fire ring blank heating + pre-rolling, the ring blank heating + final rolling in the preparation method of GH4586 large-size ring forgings are as follows. The remaining process parameters in this embodiment are the same as those in embodiment 1.

[0067] (1) Cutting The blanking specification is 300×290mm bar blank, with both end faces chamfered R15.

[0068] (2) Billet heating The rods should be loaded into the furnace within the effective heating area, with a spacing of 40 mm between the billets. Stacking is not allowed. The heating temperature is 1080°C and the holding time is 3.5 h.

[0069] (3) Upsetting + Punching The punch and anvil should be preheated in advance, and the preheating temperature is 205℃; after the ring blank is heated and kept warm, it is taken out of the furnace for upsetting + punching. The upsetting size is 100±5mm, and the punching is done with a 210mm punch.

[0070] (4) First fire ring blank heating + horse rack hole expansion The ring billet loading furnace should be within the effective area of ​​the heating furnace, the billet spacing is 40mm, stacking is not allowed, the heating temperature is 1080℃, and the insulation time is 3h; after heating and insulation, the billet is taken out of the furnace for hole expansion, and the hole expansion is completed in 3 circles, with a total deformation of 20%.

[0071] (5) Second fire ring blank heating + horse rack hole expansion The ring billet loading furnace should be within the effective area of ​​the heating furnace, with a billet spacing of 40mm, and stacking is not allowed. The heating temperature is 1080℃ and the insulation time is 3h. After heating and insulation, the billet is taken out of the furnace for hole expansion, which is completed in 3 circles, with a total deformation of 18%.

[0072] (6) First fire ring billet heating + pre-rolling The ring billet should be loaded into the effective area of ​​the heating furnace, with a billet spacing of 40mm, and stacking is not allowed. The heating temperature is 1080℃ and the holding time is 2h. Then the ring billet is rolled out of the furnace, with the core roller temperature of 206℃, the core roller specification of 220-320mm, the rolling time of 145s, the transfer time of 53s, and the rolling deformation of 25%.

[0073] (7) Second fire ring billet heating + pre-rolling The ring billet should be loaded into the effective area of ​​the heating furnace, with a billet spacing of 40mm, and stacking is not allowed. The heating temperature is 1060℃ and the holding time is 2h. Then the ring billet is rolled out of the furnace, with the core roller temperature of 205℃, the core roller specification of 220-320mm, the rolling time of 139s, the transfer time of 54s, and the rolling deformation of 28%.

[0074] (8) Ring billet heating + final rolling The ring billet should be loaded into the effective area of ​​the heating furnace, with a billet spacing of 40mm, and stacking is not allowed. The heating temperature is 1060℃ and the insulation time is 1.5h. Then the ring billet is rolled out of the furnace, with the core roller temperature of 203℃, the core roller specification of 220-320mm, the rolling time of 147s, the transfer time of 55s, and the rolling deformation of 25%.

[0075] (9) Solution heat treatment + aging heat treatment The ring billet should be loaded into the effective zone of the heating furnace, the solution treatment heating temperature is 1080℃, the holding time is 4h, and the oil cooling is to room temperature. The aging heat treatment heating temperature is 760℃, the holding time is 8h, and the air cooling is to room temperature.

[0076] The obtained GH4586 alloy forgings were tested, and the test results are shown in Table 1.

[0077] Comparative Example 1 Comparative Example 1 provides a GH4586 large-size ring forging and a preparation method thereof.

[0078] The difference between this comparative example and Example 1 is that the preparation method of GH4586 large-size ring forgings includes heating of bar material, heating of first fire ring blank + horse rack expansion, heating of second fire ring blank + horse rack expansion, heating of first fire ring blank + pre-rolling, heating of second fire ring blank + pre-rolling, and heating of ring blank + final rolling. The details are as follows. The remaining process parameters in this comparative example are the same as those in Example 1.

[0079] (1) Cutting The blanking specification is 300×290mm bar blank, with both end faces chamfered R15.

[0080] (2) Billet heating The rods should be loaded into the furnace within the effective heating area, the spacing between the billets is 40mm, and stacking is not allowed. The heating temperature is 1160℃ and the holding time is 3.5h.

[0081] (3) Upsetting + Punching The punch and anvil should be preheated in advance, and the preheating temperature is 205℃; after the ring blank is heated and kept warm, it is taken out of the furnace for upsetting + punching. The upsetting size is 100±5mm, and the punching is done with a 210mm punch.

[0082] (4) First fire ring blank heating + horse rack hole expansion The ring billets should be loaded into the furnace within the effective area of ​​the heating furnace, with a spacing of 40 mm between billets, and stacking is not allowed. The heating temperature is 1160°C and the insulation time is 3 hours. After heating and insulation, the billets are taken out of the furnace for hole expansion, which is completed in 3 circles with a total deformation of 23%.

[0083] (5) Second fire ring blank heating + horse rack hole expansion The ring billet should be loaded into the effective area of ​​the heating furnace, with a spacing of 40mm between billets. Stacking is not allowed. The heating temperature is 1160℃ and the insulation time is 3h. After heating and insulation, the billet is taken out of the furnace for hole expansion. The hole expansion is completed in 3 circles, and the total deformation is 20%.

[0084] (6) First fire ring billet heating + pre-rolling The ring billet should be loaded into the effective area of ​​the heating furnace, with a billet spacing of 40mm, and stacking is not allowed. The heating temperature is 1160℃ and the holding time is 2h. Then the ring billet is rolled out of the furnace, with the core roller temperature of 206℃, the core roller specification of 220-320mm, the rolling time of 142s, the transfer time of 52s, and the rolling deformation of 22%.

[0085] (7) Second fire ring billet heating + pre-rolling The ring billet should be loaded into the effective area of ​​the heating furnace, with a billet spacing of 40mm, and stacking is not allowed. The heating temperature is 1160℃ and the insulation time is 2h. Then the ring billet is rolled out of the furnace, with the core roller temperature of 205℃, the core roller specification of 220-320mm, the rolling time of 137s, the transfer time of 51s, and the rolling deformation of 23%.

[0086] (8) Ring billet heating + final rolling The ring billet should be loaded into the effective area of ​​the heating furnace, with a billet spacing of 40mm, and stacking is not allowed. The heating temperature is 1160℃ and the holding time is 1.5h. Then the ring billet is rolled out of the furnace, with the core roller temperature of 203℃, the core roller specification of 220-320mm, the rolling time of 148s, the transfer time of 56s, and the rolling deformation of 20%.

[0087] (9) Solution heat treatment + aging heat treatment The ring billet should be loaded into the effective zone of the heating furnace, the solution treatment heating temperature is 1080℃, the holding time is 4h, and the oil cooling is to room temperature. The aging heat treatment heating temperature is 760℃, the holding time is 8h, and the air cooling is to room temperature.

[0088] The obtained GH4586 alloy forgings were tested, and the test results are shown in Table 1.

[0089] Comparative Example 2 Comparative Example 2 provides a GH4586 large-size ring forging and a preparation method thereof.

[0090] The difference between this comparative example and Example 1 is that: the preparation method of GH4586 large-size ring forgings includes first fire ring blank heating + horse rack expansion, second fire ring blank heating + horse rack expansion, first fire ring blank heating + pre-rolling, second fire ring blank heating + pre-rolling, ring blank heating + final rolling. The details are as follows. The remaining process parameters in this comparative example are the same as those in Example 1.

[0091] (1) Cutting The blanking specification is 300×290mm bar blank, with both end faces chamfered R15.

[0092] (2) Billet heating The rods should be loaded into the furnace within the effective heating area, with a spacing of 40 mm between the billets. Stacking is not allowed. The heating temperature is 1080°C and the holding time is 3.5 h.

[0093] (3) Upsetting + Punching The punch and anvil should be preheated in advance, and the preheating temperature is 205℃; after the ring blank is heated and kept warm, it is taken out of the furnace for upsetting + punching. The upsetting size is 100±5mm, and the punching is done with a 210mm punch.

[0094] (4) First fire ring blank heating + horse rack hole expansion The ring billet loading furnace should be within the effective area of ​​the heating furnace, with a billet spacing of 40mm, and stacking is not allowed. The heating temperature is 1080℃ and the insulation time is 3h. After heating and insulation, the billet is taken out of the furnace for hole expansion, which is completed in 3 circles with a total deformation of 10%.

[0095] (5) Second fire ring blank heating + horse rack hole expansion The ring billet loading furnace should be within the effective area of ​​the heating furnace, with a billet spacing of 40mm, and stacking is not allowed. The heating temperature is 1080℃ and the insulation time is 3h. After heating and insulation, the billet is taken out of the furnace for hole expansion, which is completed in 3 circles with a total deformation of 10%.

[0096] (6) First fire ring billet heating + pre-rolling The ring billet should be loaded into the effective area of ​​the heating furnace, with a billet spacing of 40mm, and stacking is not allowed. The heating temperature is 1080℃ and the holding time is 2h. Then the ring billet is rolled out of the furnace, with the core roller temperature of 206℃, the core roller specification of 220-320mm, the rolling time of 135s, the transfer time of 48s, and the rolling deformation of 10%.

[0097] (7) Second fire ring billet heating + pre-rolling The ring billet should be loaded into the effective area of ​​the heating furnace, with a spacing of 40mm between billets, and stacking is not allowed. The heating temperature is 1080℃ and the holding time is 2h. Then the ring billet is rolled out of the furnace, with the core roller temperature of 205℃, the core roller specification of 220-320mm, the rolling time of 140s, the transfer time of 55s, and the rolling deformation of 10%.

[0098] (8) Ring billet heating + final rolling The ring billet should be loaded into the effective area of ​​the heating furnace, with a billet spacing of 40mm, and stacking is not allowed. The heating temperature is 1080℃ and the holding time is 1.5h. Then the ring billet is rolled out of the furnace, with the core roller temperature of 203℃, the core roller specification of 220-320mm, the rolling time of 137s, the transfer time of 53s, and the rolling deformation of 10%.

[0099] (9) Solution heat treatment + aging heat treatment The ring billet should be loaded into the effective zone of the heating furnace, the solution treatment heating temperature is 1080℃, the holding time is 4h, and the oil cooling is to room temperature. The aging heat treatment heating temperature is 760℃, the holding time is 8h, and the air cooling is to room temperature.

[0100] The obtained GH4586 alloy forgings were tested, and the test results are shown in Table 1.

[0101] Performance testing (1) The GH4586 large-size ring forgings obtained in Example 1 were randomly selected for metallographic structure observation. The high-magnification grain morphology is shown in Figure 3 and Figure 4 , Figure 3 The metallographic structure diagram (100X) of the GH4586 large-size ring forging in Example 1; Figure 4 This is the metallographic structure diagram (200X) of the GH4586 large-size ring forging in Example 1. It can be seen from the observation that the grain size distribution of the forging is uniform, without obvious coarse grains, strips and defects.

[0102] (2) Mechanical properties test methods and test performance: GB / T 228.1: Room temperature test method for tensile test of metallic materials; GB / T 228.2: High temperature test method for tensile test of metallic materials; GB / T 2039: Durability test methods for metallic materials; GB / T 6394: Determination of average grain size of metals.

[0103] Test results: as shown in Table 1-3.

[0104] Table 1 Room temperature mechanical properties test results of GH4586 large size ring forgings in the examples and comparative examples Table 2 Test results of 800℃ high temperature tensile properties of GH4586 large-size ring forgings in the examples and comparative examples Table 3 Test results of 800℃ high temperature durability of GH4586 large-size ring forgings in the examples and comparative examples Combined with the test results in Tables 1 to 3, the GH4586 large-size ring forgings obtained by the technical solution provided by the present application have mechanical properties that meet the requirements, and the technical solution greatly reduces the cracking tendency of the ring forgings and obtains a uniform and fine structure through the reasonable selection and matching of the deformation temperature and the deformation amount. Through the fine grain strengthening effect, the strength of the GH4586 large-size ring forgings is increased while the plasticity is also increased, which greatly improves the mechanical properties of the forgings.

[0105] Although the present invention has been described in detail above with general descriptions and specific embodiments, it is obvious to those skilled in the art that some modifications or improvements may be made thereto based on the present invention. Therefore, these modifications or improvements made without departing from the spirit of the present invention all fall within the scope of protection claimed by the present invention.

Claims

1. A method for preparing a super-large ring with a temperature resistance of 800°C, characterized in that: The process includes performing the following steps in sequence: The GH4586 alloy bars are cut and cut according to the weight of the ring forgings, and the cut bars are subjected to heat preservation treatment at 1000-1150℃, and then upsetting and punching are performed to obtain cake blanks; The blank is heat treated at 1000-1150°C, then the blank is expanded by a rack, and then the blank is heat treated at 1000-1150°C, then pre-rolled and final rolled to obtain a GH4586 ring forging blank. In the horse rack hole expansion process: the blank spacing is ≥30mm, stacking is not allowed, the heating temperature is 1000~1150℃, the insulation time is 2~4h, the ring blank horse rack hole expansion is completed according to 1~3 turns, and the total deformation is 15%~25%; Then, solution heat treatment and aging heat treatment are carried out to finally obtain large-size ring forgings of GH4586 alloy.

2. The method for preparing the super-large ring with a temperature resistance of 800°C according to claim 1, characterized in that: When the bar material is heated, the spacing between the blanks is ≥30 mm, stacking is not allowed, the heating temperature is 1020~1150°C, and the insulation time is 2~3.5h.

3. The method for preparing the super-large ring with a temperature resistance of 800°C according to claim 1, characterized in that: During the bar billet upsetting process, the deformation amount is 50% to 70%, and the surface temperature of the ring forging is not less than 900° C. after the bar billet upsetting and punching are completed.

4. The method for preparing the super-large ring with a temperature resistance of 800°C according to claim 1, characterized in that: In the horse rack hole expansion process: the blank spacing during ring blank heating is ≥30mm, stacking is not allowed, the heating temperature is 1020~1100℃, and the insulation time is 2.5~3.5h; the ring blank horse rack hole expansion is completed according to 1~3 turns, and the total deformation is 18%~22%.

5. The method for preparing the super-large ring with a temperature resistance of 800°C according to claim 1, characterized in that: In the pre-rolling process, the ring billet heating temperature is 1000-1150° C., the holding time is 1-3 hours, the billet spacing is ≥30 mm; the core roller temperature is greater than 200° C., the rolling time is ≤240 seconds, the transfer time is ≤90 seconds, and the rolling deformation is 15-30%.

6. The method for preparing the super-large ring with a temperature resistance of 800°C according to claim 1, characterized in that: In the final forging process, the heating temperature is 1000-1150° C., the holding time is 1-3 hours, the spacing between the billets is ≥30 mm, and stacking is not allowed.

7. The method for preparing the super-large ring with a temperature resistance of 800°C according to claim 1, characterized in that: In the final forging process, the core roll temperature is greater than 200° C., the rolling time is ≤180 s, the transfer time is ≤90 s, and the rolling deformation is 20-30%.

8. The method for preparing the super-large ring with a temperature resistance of 800°C according to claim 1, characterized in that: The process parameters of the solution heat treatment are: heat preservation at 1050-1100° C. for 2-6 hours, and oil cooling to room temperature.

9. The method for preparing the super-large size ring with a temperature resistance of 800°C according to claim 1, characterized in that: The process parameters of the aging heat treatment are: 700-850° C. for 2-16 hours, and air cooling to room temperature.

10. A GH4586 large-size ring forging, characterized in that: The GH4586 large-size ring forging is prepared by the preparation method according to any one of claims 1 to 9; the element composition of the GH4586 large-size ring forging is, by weight percentage, Cr: 18-20%, Co: 10-12%, Mo: 7-9%, W: 2-4%, Al: 1.3-1.8%, Ti: 2.9-3.5%, B: 0.003-0.01%, Fe: 0.005-2%, C: 0.01-0.08%, Mg: 0.01-0.05%, Zr: 0-1.5%, and the balance is Ni and unavoidable impurities; the weight percentage content of Mo+W is ≥11%.

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