CN115709255B - GH4780 alloy forging and preparation method and application thereof - Google Patents
GH4780 alloy forging and preparation method and application thereof Download PDFInfo
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- CN115709255B CN115709255B CN202310005753.0A CN202310005753A CN115709255B CN 115709255 B CN115709255 B CN 115709255B CN 202310005753 A CN202310005753 A CN 202310005753A CN 115709255 B CN115709255 B CN 115709255B
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Abstract
The invention belongs to the field of metal material manufacturing, and particularly relates to a GH4780 alloy forging and a preparation method and application thereof. The method comprises the following steps: (1) Homogenizing the GH4780 alloy cast ingot to obtain a homogenized cast ingot; (2) Rolling the homogenized cast ingot to obtain a rolled bar; (3) Forging the rolled bar to obtain an upset cake bar; (4) Performing die forging treatment on the upset cake bar to obtain a forged piece; (5) Carrying out solution treatment on the forged forging to obtain a solution forged piece; and (6) carrying out aging treatment on the solid solution forging. The GH4780 alloy forged piece developed by the invention has uniform grain structure, and the mechanical property of the forged piece at high service temperature is obviously improved.
Description
Technical Field
The invention belongs to the field of metal material manufacturing, and particularly relates to a GH4780 alloy forging and a preparation method and application thereof.
Background
The GH4780 nickel-based superalloy can be used for preparing various forgings for aero-engines and ground gas turbines which can be used at the temperature of 800 ℃. The GH4780 alloy in the prior art comprises the following components: 0.06 to 0.12 percent of carbon, 0.005 to 0.07 percent of zirconium, 22 to 23 percent of chromium, less than or equal to 0.2 percent of molybdenum, 1.8 to 2.2 percent of tungsten, 18.5 to 19.5 percent of cobalt, less than or equal to 0.7 percent of iron, 0.65 to 0.95 percent of niobium, 1.1 to 1.4 percent of aluminum, 2.1 to 2.4 percent of titanium, less than or equal to 0.015 percent of phosphorus, 0.002 to 0.007 percent of boron, 0.85 to 1.15 percent of tantalum, less than or equal to 0.1 percent of copper, less than or equal to 0.1 percent of manganese, less than or equal to 0.15 percent of silicon, less than or equal to 0.1 percent of vanadium, less than or equal to 0.007 percent of magnesium, less than or equal to 0.007 percent of sulfur and the balance of nickel.
The existing preparation method comprises the following steps: (1) Drawing and upsetting GH4780 alloy cast ingot for at least two times at 900-1160 ℃ to make the deformation amount of the GH4780 alloy cast ingot be 10% -50%, and obtaining GH4780 alloy blank; (2) And forging the GH4780 alloy blank at 1010-1080 ℃ for two times to ensure that the deformation of the GH4780 alloy blank is 10% -50%, thus obtaining the GH4780 alloy forging. The tensile strength of GH4780 alloy forging prepared by the prior art at room temperature is lower than 1300MPa, the tensile strength at 800 ℃ is lower than 900MPa, and the endurance life of GH4780 alloy forging prepared by the prior art at 800 ℃/500MPa is lower than 20h.
In the prior art, the content of C in GH4780 alloy reaches 0.06wt% -0.12wt%, which causes the formation of a large amount of MC carbides with larger sizes, the MC carbides are unevenly distributed and easily form mixed crystal tissues, and the MC carbides easily form stress concentration to induce the generation of cracks. In addition, in the prior art, the content of Ti (2.1 wt% -2.4 wt%) and Ta (0.85 wt% -1.15 wt%) in the GH4780 alloy is low, so that the content of gamma' phase is not high, and the high-temperature strength of the forged piece needs to be further improved. The existing preparation method can not meet the development requirement of GH4780 alloy forgings.
The strength of the forged piece prepared by the existing preparation method needs to be improved, and the use requirement at higher service temperature cannot be met.
Disclosure of Invention
The invention aims to solve the problems that a forging prepared by the prior art has a mixed crystal structure and the mechanical property at a high service temperature cannot meet the requirement, and provides a GH4780 alloy forging and a preparation method and application thereof. Compared with the prior art, the GH4780 alloy forging developed by the invention has uniform structure, and the mechanical property of the forging is obviously improved at high service temperature.
In order to achieve the purpose, the invention provides a preparation method of a GH4780 alloy forging, which is characterized by comprising the following steps:
(1) Homogenizing the GH4780 alloy cast ingot to obtain a homogenized cast ingot;
(2) Rolling the homogenized cast ingot to obtain a rolled bar;
(3) Forging the rolled bar to obtain an upset cake bar;
(4) Performing die forging treatment on the upset cake bar to obtain a forged piece;
(5) Carrying out solution treatment on the forged forging to obtain a solution forged piece;
(6) Carrying out aging treatment on the solid solution forging; wherein
The heat preservation temperature of the die forging treatment is 1050-1100 ℃; the temperature of the solution treatment is 1010-1120 ℃; the temperature of the aging treatment is 700-840 ℃.
The invention provides a GH4780 alloy forging prepared by the method.
In a third aspect, the invention provides an application of the GH4780 alloy forging in disk forgings, annular parts, rotating shafts and blades of aeroengines or ground gas turbines.
Through the technical scheme, the GH4780 alloy forging and the preparation method and application thereof provided by the invention have the following beneficial effects:
by adopting a specific treatment mode, the method not only can effectively reduce the quantity and the size of MC carbide, but also can improve the content of gamma' phase in the alloy. Compared with the prior art, the mechanical property of the GH4780 alloy forged piece developed by the invention is obviously improved at high service temperature.
Detailed Description
The endpoints of the ranges and any values disclosed herein are not limited to the precise range or value, and such ranges or values should be understood to encompass values close to those ranges or values. For ranges of values, between the endpoints of each of the ranges and the individual points, and between the individual points may be combined with each other to give one or more new ranges of values, and these ranges of values should be considered as specifically disclosed herein.
In order to achieve the purpose, the invention provides a preparation method of a GH4780 alloy forging, which is characterized by comprising the following steps:
(1) Homogenizing the GH4780 alloy cast ingot to obtain a homogenized cast ingot;
(2) Rolling the homogenized cast ingot to obtain a rolled bar;
(3) Forging the rolling bar to obtain an upset cake bar;
(4) Carrying out die forging treatment on the upset cake bar to obtain a forged forging;
(5) Carrying out solution treatment on the forged forging to obtain a solution forged piece;
(6) Carrying out aging treatment on the solid solution forging; wherein
The heat preservation temperature of the die forging treatment is 1050-1100 ℃; the temperature of the solution treatment is 1010-1120 ℃; the temperature of the aging treatment is 700-840 ℃.
The preparation method of the GH4780 alloy ingot is not particularly limited, and the GH4780 alloy ingot can be obtained by a conventional method in the field, for example, the GH4780 alloy ingot is obtained by triple smelting of vacuum induction smelting, electroslag remelting and vacuum consumable remelting, or the GH4780 alloy ingot is obtained by double smelting of vacuum induction smelting and vacuum consumable remelting.
According to the invention, the homogenization treatment comprises:
(1-1) upsetting the GH4780 alloy ingot to obtain an upset ingot;
(1-2) carrying out drawing treatment on the upset ingot to obtain a drawn ingot;
(1-3) carrying out first heat preservation treatment on the drawn ingot, and then cooling the drawn ingot to room temperature along with the furnace to obtain the homogenized ingot.
The furnace cooling in the invention refers to: the blank is cooled in the furnace as the furnace temperature decreases, and the same is not described in detail below.
According to the invention, said upsetting treatment comprises the following steps: and (2) heating the GH4780 alloy ingot from T1 to 200 ℃ to T2 to 1180 to 1220 ℃ at a heating rate of 10 to 30 ℃/min, and carrying out heat preservation treatment for 20 to 40 hours.
According to the invention, the deformation B1 of the upsetting treatment is 20-50%.
According to the invention, the pressing-down speed of the upsetting treatment is 5-15mm/min.
The pressing speed referred to in the present invention means: the pressing amount of the anvil of the forging press per unit time is the same as described below, and will not be described again.
According to the present invention, the drawing conditions include: the heat preservation temperature of the drawing treatment is 1140-1180 ℃, and the heat preservation time of the drawing treatment is 20-40h.
According to the invention, the deformation B2 of the elongation treatment is 20-50%.
The deformation amount referred to in the present invention means: the variation of the blank along the deformation direction before and after the deformation is processed will not be described in detail below.
According to the invention, the pressing speed of the drawing process is 5-15mm/min.
According to the present invention, the conditions of the first soak treatment include: the heat preservation temperature of the first heat preservation treatment is 1140-1180 ℃, and the heat preservation time of the first heat preservation treatment is 10-20h.
According to the invention, the rolling process comprises:
(2-1) carrying out hot continuous rolling treatment on the homogenized cast ingot to obtain a hot continuous rolled bar;
(2-2) carrying out warm rolling treatment on the hot continuous rolled bar to obtain a warm rolled bar;
and (2-3) carrying out cold rolling treatment on the warm rolled bar to obtain the rolled bar.
According to the invention, the hot continuous rolling process comprises the following steps: preserving the heat of the homogenized cast ingot for 1-4h at 1165-1195 ℃, and then performing first rolling, wherein the furnace cooling is performed to 1050-1100 ℃ at a cooling speed of 10-20 ℃/min.
The cold speed in the invention refers to: the temperature decrease rate, hereinafter referred to as cooling rate, is the same as that referred to herein and will not be described further.
According to the invention, the time of the first rolling is 60-180s.
According to the invention, the first rolling is carried out 1 to 3 times with a fire.
According to the invention, the deformation B3 of the hot continuous rolling treatment is 30-60%.
According to the invention, the warm rolling treatment comprises the following steps: and (3) preserving the heat of the hot continuous rolled bar for 1-4h at 1050-1100 ℃, then carrying out secondary rolling, and cooling in air to room temperature.
According to the invention, the time of the second rolling is 30-100s.
According to the invention, the second rolling is carried out 1 to 3 fires.
According to the invention, the deformation B4 of the warm rolling treatment is 10-30%.
According to the invention, the cold rolling treatment has a deformation B5 of 10 to 20%.
According to the invention, the time of the cold rolling treatment is 30-100s.
According to the invention, the forging treatment conditions of the upset cake comprise: the heat preservation temperature of the upsetting cake forging treatment is 850-1040 ℃, and the heat preservation time of the upsetting cake forging treatment is 1-4h.
According to the invention, the deformation B6 of the heading cake forging treatment is 50-70%.
According to the invention, the method further comprises the step of coating an oxidation-resistant coating on the surface of the heading bar before the die forging treatment.
The antioxidant used in the present invention is not particularly limited, and for example, a glass protecting lubricant can be used as the antioxidant.
According to the present invention, the conditions of the swaging process include: the temperature for the die forging treatment is 1050-1100 ℃, and the time for the die forging treatment is 1-4h.
According to the present invention, the deformation amount B7 of the swaging process is 20 to 60%.
According to the present invention, the finish forging temperature of the swaging process is not lower than 850 ℃.
According to the invention, the solution treatment comprises the following steps:
(5-1) keeping the temperature of the forged forging for 1-4h at 1010-1040 ℃, and then cooling the forged forging to room temperature in air to obtain a primary solid solution forging;
(5-2) preserving the temperature of the primary solid solution forging for 1-4h at 1060-1120 ℃, and then cooling the primary solid solution forging to room temperature to obtain the solid solution forging.
According to the invention, the ageing treatment comprises the following steps:
(6-1) keeping the temperature of the solid solution forging at 700-760 ℃ for 8-16h, and then cooling the solid solution forging to room temperature in air to obtain an aged forging; (6-2) keeping the temperature of the aged forge piece at 780-840 ℃ for 8-16h, and then cooling the aged forge piece to room temperature in an air cooling mode to obtain the GH4780 alloy forge piece.
According to the invention, the GH4780 alloy ingot comprises the following elements, based on the total mass of the GH4780 alloy ingot: 0.01 to 0.03wt% carbon, 2.5 to 3.5wt% titanium, 1.2 to 3.5wt% tantalum, 0.005 to 0.07wt% zirconium, 22 to 23wt% chromium, not more than 0.2wt% molybdenum, 1.8 to 2.2wt% tungsten, 18.5 to 19.5wt% cobalt, not more than 0.7wt% iron, 0.65 to 0.95wt% niobium, 1.1 to 1.4wt% aluminum, not more than 0.015wt% phosphorus, 0.002 to 0.007wt% boron, not more than 0.1wt% copper, not more than 0.1wt% manganese, not more than 0.15wt% silicon, not more than 0.1wt% vanadium, not more than 0.007wt% magnesium, not more than 0.007wt% sulfur, and 45 to 55wt% nickel.
In the present invention, the length of the GH4780 alloy ingot is denoted as L, and the GH4780 alloy ingot is treated as follows: (A) Homogenizing a GH4780 alloy ingot, wherein the homogenizing comprises the following steps:
(A-1) heating the GH4780 alloy cast ingot from T1 to 200 ℃ to T2 to 1180 to 1220 ℃ at a heating rate of 10 to 30 ℃/min, and carrying out upsetting treatment after heat preservation treatment for 20 to 40 hours to obtain an upset cast ingot;
(A-2) preserving the temperature of the upset ingot casting at 1140-1180 ℃ for 20-40h, and then carrying out drawing treatment to obtain a drawn ingot casting;
(A-3) carrying out first heat preservation treatment on the drawn ingot, wherein the heat preservation temperature of the first heat preservation treatment is 1140-1180 ℃, the heat preservation time of the first heat preservation treatment is 10-20 hours, and then cooling to the room temperature along with a furnace to obtain a homogenized ingot;
(B) Carrying out rolling treatment on the homogenized cast ingot, wherein the rolling treatment process comprises the following steps:
(B-1) carrying out hot continuous rolling treatment on the homogenized ingot, wherein the hot continuous rolling treatment comprises the following steps: preserving the heat of the homogenized cast ingot for 1-4h at the temperature of 1165-1195 ℃, performing first rolling, and cooling to 1050-1100 ℃ in a furnace at the cooling speed of 10-20 ℃/min to obtain a hot continuous rolling bar;
(B-2) carrying out warm rolling treatment on the hot continuous rolled bar, wherein the warm rolling treatment comprises the following steps: preserving the heat of the hot continuous rolled bar for 1-4h at 1050-1100 ℃, then carrying out second rolling, and carrying out air cooling to room temperature to obtain a warm rolled bar;
(B-3) cold rolling the warm rolled bar, wherein the deformation of the cold rolling is 10-20%,
obtaining a rolled bar;
(C) And carrying out upset cake forging treatment on the rolled bar, wherein the upset cake forging treatment conditions comprise: the heat preservation temperature of the upsetting cake forging treatment is 850-1040 ℃, and the heat preservation time of the upsetting cake forging treatment is 1-4 hours, so that an upsetting bar is obtained;
(D) Coating an oxidation-resistant coating on the surface of the upsetting bar, and then carrying out die forging treatment, wherein the die forging treatment conditions comprise: the heat preservation temperature of the die forging treatment is 1050-1100 ℃, the heat preservation time of the die forging treatment is 1-4h, and a forged forging piece is obtained; (E) Carrying out solution treatment on the forged forging, wherein the solution treatment comprises the following steps:
(E-1) keeping the temperature of the forged forging for 1-4h at 1010-1040 ℃, and then cooling the forged forging to room temperature in air to obtain a primary solid solution forging;
(E-2) keeping the temperature of the primary solid solution forging at 1060-1120 ℃ for 1-4h, and then cooling the primary solid solution forging to room temperature to obtain a solid solution forging;
(F) Carrying out aging treatment on the solid solution forging, wherein the aging treatment comprises the following steps:
(F-1) keeping the temperature of the solid solution forging at 700-760 ℃ for 8-16h, and then cooling the solid solution forging to room temperature in air to obtain an aged forging; (F-2) keeping the temperature of the aged forging at 780-840 ℃ for 8-16h, and then cooling the aged forging to room temperature to obtain the GH4780 alloy forging.
The GH4780 alloy forging piece prepared by the treatment method has a grain structure, and the thermal deformation capacity of the bar can be improved. Preferably, the grain size of the GH4780 alloy forging is 4-6 grade, the room-temperature tensile strength is not less than 1450MPa, the 800-DEG C tensile strength is not less than 1050MPa, and the lasting life of 800 ℃/500MPa is not less than 40h.
The invention provides a GH4780 alloy forging prepared by the method.
Preferably, the grain size of the GH4780 alloy forging is 4-6 grade, the room-temperature tensile strength is not less than 1450MPa, the 800-DEG C tensile strength is not less than 1050MPa, and the lasting life of 800 ℃/500MPa is not less than 40h.
In a third aspect, the invention provides an application of the GH4780 alloy forging in disk forgings, annular parts, rotating shafts and blades of aeroengines or ground gas turbines.
In the following examples, various raw materials used were commercially available unless otherwise specified.
The following is a test method related to performance parameters in the embodiment of the invention:
(1) Tensile strength at room temperature: GB/T228.1 metallic Material tensile test part 1: room temperature test method.
(2) Tensile strength at 800 ℃: part 2 of the tensile test of GB/T228.2 metallic materials: high temperature test method.
(3) 800 ℃/500MPa of endurance life: GB/T2039 metal material uniaxial tensile creep and endurance test method.
(4) Grain size: GB/T6394 method for measuring average grain size of metal.
Example 1
GH4780 alloy cast ingots (the ingot shape is phi 508 +/-20 mm) are obtained by smelting through a duplex process, and the composition is as follows: 0.02wt% carbon, 3wt% titanium, 2.8wt% tantalum, 0.06wt% zirconium, 22wt% chromium, 0.2wt% molybdenum, 1.8wt% tungsten, 18.7wt% cobalt, 0.5wt% iron, 0.9wt% niobium, 1.2wt% aluminum, 0.01wt% phosphorus, 0.003wt% boron, 0.08wt% copper, 0.08wt% manganese, 0.12wt% silicon, 0.02wt% vanadium, 0.003wt% magnesium, 0.004wt% sulfur, and 48.5wt% nickel.
In the present invention, the length of the GH4780 alloy ingot is denoted as L, and the GH4780 alloy ingot is treated in the following manner: (A) Homogenizing a GH4780 alloy ingot, wherein the homogenizing comprises the following steps:
(A-1) heating the GH4780 alloy cast ingot from T1 to 300 ℃ to T2 to 1220 ℃ at a heating rate of 30 ℃/min, and carrying out upsetting treatment after heat preservation treatment for 40h, wherein the pressing speed of the upsetting treatment is 15mm/min, the deformation of the upsetting treatment is 50%, so as to obtain an upset cast ingot;
(A-2) keeping the temperature of the upset ingot at 1180 ℃ for 40 hours, wherein the pressing speed of the drawing treatment is 15mm/min, and the deformation of the drawing treatment is 50%, so that a drawn ingot is obtained;
(A-3) carrying out first heat preservation treatment on the drawn ingot, wherein the heat preservation temperature of the first heat preservation treatment is 1180 ℃, the heat preservation time of the first heat preservation treatment is 20 hours, and then cooling to room temperature along with a furnace to obtain a homogenized ingot;
(B) Carrying out rolling treatment on the homogenized ingot, wherein the rolling treatment process comprises the following steps:
(B-1) carrying out hot continuous rolling treatment on the homogenized ingot, wherein the hot continuous rolling treatment comprises the following steps: keeping the temperature of the homogenized cast ingot at 1195 ℃ for 4 hours, then carrying out first rolling, carrying out furnace cooling to 1100 ℃ at a cooling speed of 20 ℃/min, wherein the time of the first rolling is 180s, the first rolling is carried out for 3 times, the deformation of the hot continuous rolling treatment is 60%, and thus obtaining a hot continuous rolling bar;
(B-2) carrying out warm rolling treatment on the hot continuous rolled bar, wherein the warm rolling treatment comprises the following steps: keeping the temperature of the hot continuous rolled bar at 1100 ℃ for 4 hours, performing second rolling for 100s for 3 times, performing warm rolling for 30% of deformation, and performing air cooling to room temperature to obtain a warm rolled bar;
(B-3) performing cold rolling treatment on the warm rolled bar, wherein the deformation of the cold rolling treatment is 20%;
the time of the cold rolling treatment is 100s, and a rolled bar is obtained;
(C) And carrying out upset cake forging treatment on the rolled bar, wherein the upset cake forging treatment conditions comprise: the heat preservation temperature of the forging treatment of the upsetting cake is 1040 ℃, the heat preservation time of the forging treatment of the upsetting cake is 4 hours, and the deformation of the forging treatment of the upsetting cake is 70 percent to obtain an upsetting bar;
(D) Coating glass protection lubricant on the surface of the upsetting bar, and then performing die forging treatment, wherein the conditions of the die forging treatment comprise: the heat preservation temperature of the die forging treatment is 1100 ℃, the heat preservation time of the die forging treatment is 4h, the deformation amount of the die forging treatment is 60%, and the finish forging temperature of the die forging treatment is 1000 ℃, so that a forged forging piece is obtained;
(E) Carrying out solution treatment on the forged forging, wherein the solution treatment comprises the following steps:
(E-1) keeping the temperature of the forged forging for 4 hours at 1040 ℃, and then cooling the forged forging to room temperature to obtain a primary solid solution forging; (E-2) keeping the temperature of the primary solid solution forging at 1120 ℃ for 4 hours, and then cooling the primary solid solution forging to room temperature in an air cooling mode to obtain a solid solution forging; (F) Carrying out aging treatment on the solid solution forging, wherein the aging treatment comprises the following steps:
(F-1) keeping the temperature of the solid solution forging at 760 ℃ for 16h, and then cooling the solid solution forging to room temperature in air to obtain an aged forging;
(F-2) keeping the temperature of the aged forge piece at 840 ℃ for 16h, and then cooling the aged forge piece to room temperature in air to obtain the GH4780 alloy forge piece.
The obtained GH4780 alloy forging was tested, and the test results are shown in Table 1.
Example 2
GH4780 alloy ingot was the same as in example 1.
In the present invention, the length of the GH4780 alloy ingot is denoted as L, and the GH4780 alloy ingot is treated in the following manner: (A) Homogenizing a GH4780 alloy ingot, wherein the homogenizing comprises the following steps:
(A-1) heating the GH4780 alloy ingot from T1 to 200 ℃ at a heating rate of 10 ℃/min to T2 of 1180 ℃, and carrying out heat preservation treatment for 20 hours, wherein the pressing rate of the upsetting treatment is 5mm/min, and the deformation of the upsetting treatment is 20%, so as to obtain an upset ingot;
(A-2) keeping the temperature of the upset ingot at 1140 ℃ for 20 hours, then keeping the pressing speed of the drawing treatment at 5mm/min, and keeping the deformation of the drawing treatment at 20% to obtain a drawn ingot;
(A-3) carrying out first heat preservation treatment on the drawn ingot, wherein the heat preservation temperature of the first heat preservation treatment is 1140 ℃, the heat preservation time of the first heat preservation treatment is 10 hours, and then cooling the ingot to the room temperature along with a furnace to obtain a homogenized ingot;
(B) Carrying out rolling treatment on the homogenized ingot, wherein the rolling treatment process comprises the following steps:
(B-1) carrying out hot continuous rolling treatment on the homogenized ingot, wherein the hot continuous rolling treatment comprises the following steps: keeping the temperature of the homogenized cast ingot at 1165 ℃ for 1h, then performing first rolling, cooling the homogenized cast ingot to 1050 ℃ at a cooling speed of 10 ℃/min, wherein the time of the first rolling is 60s, the first rolling is performed for 1 heating time, the deformation of the hot continuous rolling treatment is 30%, and thus obtaining a hot continuous rolled bar;
(B-2) carrying out warm rolling treatment on the hot continuous rolled bar, wherein the warm rolling treatment comprises the following steps: keeping the temperature of the hot continuous rolled bar at 1050 ℃ for 1h, performing second rolling for 30s for 1 heating time, performing warm rolling for 10% deformation, and performing air cooling to room temperature to obtain a warm rolled bar;
(B-3) performing cold rolling treatment on the warm rolled bar, wherein the deformation of the cold rolling treatment is 10%;
the time of the cold rolling treatment is 30s, and a rolled bar is obtained;
(C) Carrying out upsetting cake forging treatment on the rolled bar, wherein the upsetting cake forging treatment conditions comprise: the heat preservation temperature of the upsetting cake forging treatment is 850 ℃, the heat preservation time of the upsetting cake forging treatment is 1h, and the deformation of the upsetting cake forging treatment is 50%, so that an upsetting bar is obtained;
(D) Coating glass protection lubricant on the surface of the upsetting bar, and then performing die forging treatment, wherein the conditions of the die forging treatment comprise: the heat preservation temperature of the die forging treatment is 1050 ℃, the heat preservation time of the die forging treatment is 1h, the deformation of the die forging treatment is 20%, and the finish forging temperature of the die forging treatment is 850 ℃ to obtain a forged forging;
(E) Carrying out solution treatment on the forged forging piece, wherein the solution treatment comprises the following steps:
(E-1) keeping the temperature of the forged forging for 1h at 1010 ℃, and then cooling the forged forging to room temperature in air to obtain a primary solid solution forging; (E-2) keeping the temperature of the primary solid solution forging at 1060 ℃ for 1h, and then cooling the primary solid solution forging to room temperature in an air manner to obtain a solid solution forging; (F) Carrying out aging treatment on the solid solution forging, wherein the aging treatment comprises the following steps:
(F-1) keeping the temperature of the solid solution forging at 700 ℃ for 8 hours, and then cooling the solid solution forging to room temperature in an air cooling mode to obtain an aged forging;
(F-2) keeping the temperature of the aged forge piece at 780 ℃ for 8h, and then cooling the aged forge piece to room temperature in an air cooling mode to obtain the GH4780 alloy forge piece.
The obtained GH4780 alloy forging was tested, and the test results are shown in Table 1.
Example 3
GH4780 alloy ingot was the same as in example 1.
In the invention, the length of the GH4780 alloy ingot is marked L, and the GH4780 alloy ingot is treated in the following way: (A) Homogenizing a GH4780 alloy ingot, wherein the homogenizing comprises the following steps:
(A-1) heating the GH4780 alloy cast ingot from T1 to 250 ℃ to T2 to 1200 ℃ at a heating rate of 20 ℃/min, and carrying out heat preservation treatment for 30h, wherein the pressing rate of upsetting treatment is 10mm/min, and the deformation of upsetting treatment is 35%, so as to obtain an upset cast ingot;
(A-2) keeping the temperature of the upset ingot for 30 hours at 1160 ℃, wherein the pressing speed of the drawing treatment is 10mm/min, and the deformation of the drawing treatment is 35%, so as to obtain a drawn ingot;
(A-3) carrying out first heat preservation treatment on the drawn ingot, wherein the heat preservation temperature of the first heat preservation treatment is 1160 ℃, the heat preservation time of the first heat preservation treatment is 15 hours, and then cooling to the room temperature along with the furnace to obtain a homogenized ingot;
(B) Carrying out rolling treatment on the homogenized ingot, wherein the rolling treatment process comprises the following steps:
(B-1) carrying out hot continuous rolling treatment on the homogenized ingot, wherein the hot continuous rolling treatment comprises the following steps: keeping the temperature of the homogenized cast ingot at 1180 ℃ for 2.5 hours, carrying out first rolling, carrying out furnace cooling to 1075 ℃ at a cooling speed of 15 ℃/min, wherein the time of the first rolling is 120s, the first rolling is carried out for 2 times, the deformation of the hot continuous rolling treatment is 45%, and thus obtaining a hot continuous rolling bar;
(B-2) carrying out warm rolling treatment on the hot continuous rolled bar, wherein the warm rolling treatment comprises the following steps: keeping the temperature of the hot continuous rolled bar at 1075 ℃ for 2.5 hours, then carrying out second rolling for 70s, carrying out 2 times of heating on the second rolling, and carrying out air cooling to room temperature to obtain a warm rolled bar, wherein the deformation of the warm rolling treatment is 20%;
(B-3) performing cold rolling treatment on the warm rolled bar, wherein the deformation of the cold rolling treatment is 15%;
the time of the cold rolling treatment is 70s, and a rolled bar is obtained;
(C) And carrying out upset cake forging treatment on the rolled bar, wherein the upset cake forging treatment conditions comprise: the heat preservation temperature of the forging treatment of the upsetting cake is 945 ℃, the heat preservation time of the forging treatment of the upsetting cake is 2.5 hours, and the deformation of the forging treatment of the upsetting cake is 60 percent to obtain an upsetting bar;
(D) Coating glass protection lubricant on the surface of the upsetting bar, and then performing die forging treatment, wherein the conditions of the die forging treatment comprise: the heat preservation temperature of the die forging treatment is 1075 ℃, the heat preservation time of the die forging treatment is 2.5h, the deformation amount of the die forging treatment is 40%, and the final forging temperature of the die forging treatment is 950 ℃ to obtain a forged piece;
(E) Carrying out solution treatment on the forged forging, wherein the solution treatment comprises the following steps:
(E-1) keeping the temperature of the forged forging piece at 1025 ℃ for 2.5 hours, and then cooling the forged forging piece to room temperature in air to obtain a primary solid solution forging piece; (E-2) keeping the temperature of the primary solid solution forging at 1090 ℃ for 2.5 hours, and then cooling the primary solid solution forging to room temperature in an air mode to obtain a solid solution forging; (F) Carrying out aging treatment on the solid solution forging, wherein the aging treatment comprises the following steps:
(F-1) keeping the temperature of the solid solution forging at 730 ℃ for 12h, and then cooling the solid solution forging to room temperature in an air cooling mode to obtain an aged forging;
(F-2) keeping the temperature of the aged forge piece at 810 ℃ for 12h, and then cooling the aged forge piece to room temperature in air to obtain the GH4780 alloy forge piece.
The obtained GH4780 alloy forging was tested, and the test results are shown in Table 1.
Comparative example 1
A GH4780 alloy forging was made according to a procedure similar to that of example 3, except that the holding temperature for the forging process in step (D) was 1020 ℃.
The obtained GH4780 alloy forging was tested, and the test results are shown in Table 1.
Comparative example 2
GH4780 alloy forging was prepared according to a procedure similar to that of example 3, except that
(E-1) keeping the temperature of the forged forging for 1h at 980 ℃, and then cooling the forged forging to room temperature in air to obtain a primary solid solution forging; (E-2) keeping the temperature of the primary solid solution forging at 1020 ℃ for 1h, and then cooling the primary solid solution forging to room temperature in air to obtain a solid solution forging; (F-1) keeping the temperature of the solid solution forging at 650 ℃ for 8 hours, and then cooling the solid solution forging to room temperature in air to obtain an aged forging;
(F-2) keeping the temperature of the aged forge piece at 760 ℃ for 8h, and then cooling the aged forge piece to room temperature in air.
The obtained GH4780 alloy forging was tested, and the test results are shown in Table 1.
Comparative example 3
A GH4780 alloy forging was prepared according to a procedure similar to that of example 3, except that: the treatment method does not perform rolling treatment.
The obtained GH4780 alloy forging was tested, and the test results are shown in Table 1.
TABLE 1
As can be seen from the examples, the comparative examples and the data in Table 1, the grain size of the GH4780 alloy forging prepared by the examples 1-3 can reach 6 grades, the grain size difference between the center and the edge is less than 2, the room-temperature tensile strength is not less than 1480 MPa, the 800 ℃ tensile strength is not less than 1120 MPa, and the 800 ℃/500MPa endurance life is not less than 43h. The GH4780 alloy forging piece prepared by the method has a uniform structure, has higher high-temperature strength and can meet the condition of high service temperature.
The preferred embodiments of the present invention have been described above in detail, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, many simple modifications can be made to the technical solution of the invention, including combinations of various technical features in any other suitable way, and these simple modifications and combinations should also be regarded as the disclosure of the invention, and all fall within the scope of the invention.
Claims (15)
1. A preparation method of a GH4780 alloy forging is characterized by comprising the following steps:
(1) Homogenizing the GH4780 alloy cast ingot to obtain a homogenized cast ingot;
(2) Rolling the homogenized cast ingot to obtain a rolled bar;
(3) Forging the rolled bar to obtain an upset cake bar;
(4) Carrying out die forging treatment on the upset cake bar to obtain a forged forging;
(5) Carrying out solution treatment on the forged forging to obtain a solution forged piece;
(6) Carrying out aging treatment on the solid solution forging; wherein the content of the first and second substances,
the heat preservation temperature of the die forging treatment is 1050-1100 ℃; the temperature of the solution treatment is 1010-1120 ℃; the temperature of the aging treatment is 700-840 ℃;
the rolling treatment process comprises the following steps:
(2-1) carrying out hot continuous rolling treatment on the homogenized cast ingot to obtain a hot continuous rolled bar;
(2-2) carrying out warm rolling treatment on the hot continuous rolled bar to obtain a warm rolled bar;
and (2-3) carrying out cold rolling treatment on the warm rolled bar.
2. The method of claim 1, wherein the homogenizing comprises:
(1-1) upsetting the GH4780 alloy ingot to obtain an upset ingot;
(1-2) carrying out drawing treatment on the upset ingot to obtain a drawn ingot;
(1-3) carrying out first heat preservation treatment on the drawn ingot, and then cooling the ingot to room temperature along with the furnace.
3. The method according to claim 2, wherein said upsetting process comprises the steps of:
heating the GH4780 alloy ingot from T1 to 200-300 ℃ to T2 to 1180-1220 ℃ at a heating rate of 10-30 ℃/min, and carrying out heat preservation treatment for 20-40h;
and/or the deformation B1 of the upsetting treatment is 20-50%;
and/or the pressing speed of the upsetting treatment is 5-15mm/min.
4. The method according to claim 2 or 3, wherein the conditions of the elongation process include:
the heat preservation temperature of the drawing treatment is 1140-1180 ℃, and the heat preservation time of the drawing treatment is 20-40h;
and/or the deformation B2 of the drawing treatment is 20-50%;
and/or the pressing speed of the drawing treatment is 5-15mm/min.
5. The method according to claim 2 or 3, wherein the conditions of the first soak treatment include:
the heat preservation temperature of the first heat preservation treatment is 1140-1180 ℃, and the heat preservation time of the first heat preservation treatment is 10-20h.
6. The method according to claim 1, wherein the hot continuous rolling process comprises the steps of:
preserving the heat of the homogenized ingot for 1-4h at 1165-1195 ℃, and then performing first rolling at the cooling speed of 10-20 ℃/min to 1050-1100 ℃ in a furnace;
and/or the time of the first rolling is 60-180s;
and/or, the first rolling is carried out for 1-3 times of fire;
and/or the deformation B3 of the hot continuous rolling treatment is 30-60%.
7. Method according to claim 6, wherein the warm rolling process comprises the steps of:
preserving the heat of the hot continuous rolled bar for 1-4h at 1050-1100 ℃, then carrying out second rolling, and cooling the bar to room temperature in air;
and/or the time of the second rolling is 30-100s;
and/or, the second rolling is carried out for 1-3 times;
and/or the deformation B4 of the warm rolling treatment is 10-30%.
8. The method of claim 6, wherein the cold rolling process has a gauge B5 of 10-20%;
and/or the time of the cold rolling treatment is 30-100s.
9. The method of claim 1, wherein the conditions of the upset cake forging process include: the heat preservation temperature of the forging treatment of the upset cake is 850-1040 ℃, and the heat preservation time of the forging treatment of the upset cake is 1-4h;
and/or the deformation B6 of the upsetting cake forging treatment is 50-70%.
10. The method according to claim 1, wherein the method further comprises applying an oxidation resistant coating to the surface of the upset biscuit bar material before the swaging process is performed;
and/or, the conditions of the swaging process include: the heat preservation time of the die forging treatment is 1-4h;
and/or the deformation B7 of the die forging treatment is 20-60%;
and/or the final forging temperature of the die forging treatment is not lower than 850 ℃.
11. The method of claim 1, wherein the solution treatment comprises the steps of:
(5-1) keeping the temperature of the forged forging for 1-4h at 1010-1040 ℃, and then cooling the forged forging to room temperature in air to obtain a primary solid solution forging;
(5-2) keeping the temperature of the primary solid solution forging at 1060-1120 ℃ for 1-4h, and then cooling to room temperature in air.
12. The method of claim 1, wherein the aging process comprises the steps of:
(6-1) keeping the temperature of the solid solution forging at 700-760 ℃ for 8-16h, and then cooling the solid solution forging to room temperature in air to obtain an aged forging;
(6-2) keeping the temperature of the aged forge piece at 780-840 ℃ for 8-16h, and then cooling the aged forge piece to room temperature in air.
13. The method of claim 1, wherein the GH4780 alloy ingot comprises the following elements, based on the total amount of the GH4780 alloy ingot:
0.01 to 0.03wt% carbon, 2.5 to 3.5wt% titanium, 1.2 to 3.5wt% tantalum, 0.005 to 0.07wt% zirconium, 22 to 23wt% chromium, not more than 0.2wt% molybdenum, 1.8 to 2.2wt% tungsten, 18.5 to 19.5wt% cobalt, not more than 0.7wt% iron, 0.65 to 0.95wt% niobium, 1.1 to 1.4wt% aluminum, not more than 0.015wt% phosphorus, 0.002 to 0.007wt% boron, not more than 0.1wt% copper, not more than 0.1wt% manganese, not more than 0.15wt% silicon, not more than 0.1wt% vanadium, not more than 0.007wt% magnesium, not more than 0.007wt% sulfur, and 45 to 55wt% nickel.
14. A GH4780 alloy forging made by the method of any of claims 1-13;
and/or the grain size of the GH4780 alloy forging is 4-6 grade, the room-temperature tensile strength is more than or equal to 1450MPa, the 800-DEG C tensile strength is more than or equal to 1050MPa, and the endurance life of 800 ℃/500MPa is more than or equal to 40h.
15. Use of the GH4780 alloy forging of claim 14 in aircraft engine or ground gas turbine disc forgings, annular parts, rotating shafts and blades.
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