Precipitation hardening type nickel-based high-temperature alloy strip and preparation method thereof

Abstract

The invention discloses a precipitation hardening type nickel-based high-temperature alloy belt and a preparation method thereof, and belongs to the technical field of nickel alloy belts. The precipitation hardening type nickel-based high-temperature alloy strip comprises the following components in percentage by mass: 0.03 to 0.07 percent of carbon, less than or equal to 0.002 percent of boron, 1.3 to 1.7 percent of aluminum, 0.9 to 1.1 percent of titanium, 19 to 21 percent of chromium, 4.2 to 4.4 percent of tungsten, 5.38 to 5.64 percent of molybdenum, 4.2 to 4.4 percent of tantalum and the balance of nickel. The precipitation hardening type nickel-based high-temperature alloy strip is prepared by the following steps: weighing the ingredients according to the formula, melting and refining by adopting a vacuum induction furnace, then carrying out cogging forging and high-temperature rolling, and sequentially carrying out primary solid solution, three-section cold rolling annealing, secondary solid solution and aging treatment to obtain the precipitation hardening type nickel-based high-temperature alloy strip, and the room-temperature and high-temperature mechanical properties and durability of the prepared precipitation hardening type nickel-based high-temperature alloy strip are improved.

Description

Technical Field

[0001] The present invention relates to a precipitation-hardening nickel-based superalloy strip and a preparation method thereof. Background Art

[0002] Nickel-based superalloys, also known as heat-resistant alloys or superalloys, are new high-temperature-resistant metal materials that emerged with the development of modern aviation industry. They can work stably in a high-temperature environment of 600 - 1100 °C for a long time, and can withstand corrosion, oxidation and complex stresses at high temperatures without failure, which makes them show great application potential in many fields such as aerospace and energy power.

[0003] Nickel-based superalloys can be generally divided into iron-based nickel-based superalloys, nickel-based superalloys and cobalt-based nickel-based superalloys according to their compositions. Among them, cobalt-based nickel-based superalloys have been widely used due to their good tissue stability, high-temperature strength, and antioxidant and corrosion-resistant effects.

[0004] According to the strengthening method, nickel-based superalloys can be further divided into solid-solution strengthened alloys and precipitation-strengthened alloys, and their properties mainly depend on chemical composition and microstructure. In industrial applications, high requirements are placed on the room-temperature, high-temperature mechanical properties and creep properties of precipitation-hardening nickel-based superalloy strips. However, there are certain deficiencies in these properties of current precipitation-hardening nickel-based superalloy strips, making it difficult to fully meet the usage requirements under extreme working conditions. For example, in high-temperature and high-stress working environments such as hot-end components of aero-engines, existing precipitation-hardening nickel-based superalloy strips may have problems such as insufficient strength and poor creep properties, affecting the overall performance and service life of the equipment.

[0005] Therefore, it is of great practical significance to develop a material and a preparation method that can effectively improve the room-temperature, high-temperature mechanical properties and creep properties of precipitation-hardening nickel-based superalloy strips. Summary of the Invention

[0006] The purpose of the present invention is to provide a precipitation-hardening nickel-based superalloy strip and a preparation method thereof to solve the technical problems mentioned in the above background art.

[0007] The technical solution to achieve the purpose of the present invention is as follows: In a first aspect, the present invention provides a precipitation-hardening nickel-based superalloy strip, and the alloy components by mass percentage include carbon: 0.03 - 0.07%, boron ≤ 0.002%, aluminum: 1.3 - 1.7%, titanium: 0.9 - 1.1%, chromium: 19 - 21%, tungsten: 4.2 - 4.4%, molybdenum: 5.38 - 5.64%, tantalum: 4.2 - 4.4%, and the balance is nickel.

[0008] Carbon: A grain boundary strengthening element, which is beneficial for deoxidation during alloy melting, improves the purity of the alloy, and can form carbide with a dispersed distribution at the grain boundary during additive manufacturing, improving the mechanical properties of the components.

[0009] Aluminum: A γ'-phase forming element, which increases the dissolution temperature and stability of the γ'-phase, and can significantly increase the volume fraction of the γ'-phase. Aluminum can form a dense oxide film at high temperatures, improving the oxidation resistance of the alloy.

[0010] Titanium: A γ'-phase forming element, which significantly increases the dissolution temperature and stability of the γ'-phase, and can enhance the high-temperature mechanical properties of the alloy.

[0011] Chromium: Plays a solid solution strengthening effect in nickel-based superalloys and forms an oxide layer on the metal surface at high temperatures to improve the oxidation resistance of the alloy.

[0012] Tungsten: Dissolves in both the γ matrix and the γ'-phase, increases the dissolution temperature and stability of the γ'-phase, can increase the volume fraction of the γ'-phase, and has an obvious solid solution strengthening effect, and can control the coarsening rate of the γ'-phase.

[0013] Molybdenum: Segregates to the matrix, is a solid solution strengthening element, and is beneficial to the forming performance and mechanical properties of the alloy.

[0014] Furthermore, the mass ratio of tungsten to molybdenum is 0.78.

[0015] Furthermore, the precipitation-hardening nickel-based superalloy strip is obtained by melting and refining the foregoing component raw materials using a vacuum induction furnace, followed by cogging forging and hot rolling, and then successively performing primary solution treatment, three-stage cold rolling and annealing, secondary solution treatment, and aging treatment.

[0016] In a second aspect, the present invention provides a method for preparing a precipitation-hardening nickel-based superalloy strip as described in the first aspect, and the preparation steps are as follows: (1) Weigh and mix the alloy components according to the mass percentages of the foregoing alloy components; (2) Melt the alloy components prepared in step (1) using a vacuum induction melting furnace and refine for 5 - 10 min. After the refining is completed, deoxidize, pour out and cast, and solidify to obtain a nickel alloy billet; (3) Perform cogging forging on the nickel alloy billet obtained in step (2) at 1150 - 1220 °C to obtain a nickel alloy plate. Among them, the deformation amount per pass of cogging forging is not less than 30%, and the final total deformation amount is not less than 70%; (4) Scrape off the surface oxide scale of the nickel alloy plate obtained in step (3), with a turning depth of 0.5 - 1 nm. Then heat the roll to 980 - 1000 °C, and then perform hot rolling, with the deformation amount per pass not less than 35% and the final total deformation amount not less than 80%. Set the roll speed to 42.5 mm / s to obtain a nickel-based alloy strip. (5) The nickel-based alloy strip obtained in step (4) is successively subjected to one solution treatment, three-stage cold rolling and annealing, finish annealing, secondary solution treatment, and aging treatment to obtain a precipitation-hardened nickel-based superalloy strip.

[0017] Further, the vacuum degree of the vacuum induction melting furnace is 0.3~0.5 Pa, and the temperature is 1550~1570 °C.

[0018] Further, the deoxidizer uses coke, and the addition amount of coke is 30~50% of the carbon mass in the alloy components.

[0019] Further, the casting temperature is 1400~1420 °C.

[0020] Further, the temperature of the one solution treatment is 1180~1210 °C, and the solution time is 2~4 h.

[0021] Further, the three-stage cold rolling and annealing is carried out by a four-high reversible cold rolling mill. The specific steps include initial cold rolling and annealing, intermediate cold rolling and annealing, and finish cold rolling. The intermediate cold rolling and annealing is carried out by multiple passes of cold rolling. Among them, the deformation amount of each pass of the initial cold rolling and annealing, intermediate cold rolling and annealing, and finish cold rolling is 17%, 20~40%, and 25~35% respectively, and the rolling speed is 0.3~1 m / s.

[0022] The initial cold rolling and annealing and intermediate cold rolling and annealing are annealed by a protective atmosphere continuous heat treatment furnace, the temperature is 1180~1250 °C, and the strip running speed is 0.5~3.5 m / min.

[0023] The secondary solution treatment is heat-treated by a pure hydrogen protective atmosphere continuous annealing furnace, the temperature is 1180~1210 °C, and the strip running speed is 3~4 m / min; the aging treatment temperature is 700~800 °C, the time is 5~8 h, and the heating rate is 10~30 °C / min.

[0024] Adopting the above technical solution, the present invention has the following beneficial effects: (1) The precipitation-hardened nickel-based superalloy strip prepared by the present invention, by mass percentage, includes carbon: 0.03~0.07%, boron ≤ 0.002%, aluminum: 1.3~1.7%, titanium: 0.9~1.1%, chromium: 19~21%, tungsten: 4.2~4.4%, molybdenum: 5.38~5.64%, tantalum: 4.2~4.4%, and the balance is nickel. First, it is weighed according to the foregoing formula and melted and refined by a vacuum induction furnace, and then subjected to blooming forging and hot rolling. Subsequently, it is successively subjected to one solution treatment, three-stage cold rolling and annealing, secondary solution treatment, and aging treatment to obtain. The room temperature, high temperature mechanical properties and creep properties of the prepared precipitation-hardened nickel-based superalloy strip are better, and the corrosion resistance is better.

[0025] (2) The precipitation hardening nickel - based superalloy strip of the present invention has alloy components adding 4.2 - 4.4% tantalum. Adding tantalum to the alloy can increase the number of γ' phases in the alloy and the tantalum content in the γ' phase composition. Since tantalum dissolves in the γ' phase, the dissolution temperature of the γ' phase in the γ direction is increased, and tantalum reduces the aggregation rate of the γ' phase, thereby improving the stability of the γ' phase. Moreover, tantalum combines with carbon to form stable tantalum - rich MC - type carbides, which can effectively delay the transformation of carbides, effectively improving the high - temperature mechanical properties and creep properties of the precipitation hardening nickel - based superalloy strip. In addition, the tantalum pentoxide formed after adding tantalum to the alloy can react with sodium sulfate to form solid sodium tantalate, which can effectively inhibit marine gas corrosion.

[0026] (3) The precipitation hardening nickel - based superalloy strip of the present invention has alloy components adding 4.2 - 4.4% tungsten and 5.38 - 5.64% molybdenum. Among them, the mass ratio of tungsten to molybdenum is 0.78. The addition of tungsten metal greatly strengthens the binding force between atoms in the γ solid solution, slowing down the decomposition process of the γ solid solution during aging. At the same time, adding molybdenum with a mass ratio of tungsten to molybdenum of 0.78 makes the γ solid solution proceed according to a continuous mechanism during the aging process, thereby reducing the diffusion rate between grains and further enhancing the high - temperature mechanical properties and creep properties of the precipitation hardening nickel - based superalloy strip.

[0027] (4) The precipitation hardening nickel - based superalloy strip of the present invention is obtained by successively performing primary solution treatment, three - stage cold rolling and annealing, finish annealing, secondary solution treatment, and aging treatment. Among them, the secondary solution treatment is carried out by heat treatment in a continuous annealing furnace under a pure hydrogen protective atmosphere, with a temperature of 1180 - 1210 °C and a strip running speed of 3 - 4 m / min; the aging treatment temperature is 700 - 800 °C, the time is 5 - 8 h, and the heating rate is 10 - 30 °C / min. This can enable the precipitation hardening nickel - based superalloy strip to obtain an appropriate number of carbides and good morphology and distribution, and further improve the room - temperature, high - temperature mechanical properties and creep properties of the precipitation hardening nickel - based superalloy strip. Specific Embodiments

[0028] In order to better understand the above - mentioned technical solutions, the following will describe the above - mentioned technical solutions in detail in combination with specific embodiments.

[0029] Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts fall within the protection scope of the present invention.

[0030] The following embodiments are only used to more clearly illustrate the technical solutions of the present invention and should not be used to limit the protection scope of the present invention.

[0031] (Example 1) A preparation method of a precipitation hardening nickel - based superalloy strip, the preparation steps are as follows: (1)Weigh and mix the alloy components according to the following mass percentages: carbon: 0.03%, boron: 0.002%, aluminum: 1.3%, titanium: 0.9%, chromium: 19%, tungsten: 4.2%, molybdenum: 5.38%, tantalum: 4.2%, and the balance is nickel; (2)Melt the alloy components prepared in step (1) in a vacuum induction melting furnace with a vacuum degree of 0.3 Pa and a temperature of 1550 °C, then refine for 5 minutes. After refining, deoxidize, pour and solidify to obtain a nickel alloy billet; among them, the deoxidizer is coke, and the addition amount of coke is 30% of the mass of carbon in the alloy components; the pouring temperature is 1400 °C; (3)Perform cogging forging on the nickel alloy billet obtained in step (2) at 1150 °C to obtain a nickel alloy plate. Among them, the deformation amount per pass of cogging forging is not less than 30%, and the final total deformation amount is not less than 70%; (4)Scrape off the surface oxide scale of the nickel alloy plate obtained in step (3), with a turning depth of 0.5 nm. Then heat the roll to 850 °C, and then perform hot rolling. The deformation amount per pass is not less than 35%, and the final total deformation amount is not less than 80%. The roll speed is set at 42.5 mm / s to obtain a 3-mm-thick nickel-based alloy strip; (5)Solutionize the nickel-based alloy strip obtained in step (4) in vacuum at 1180 °C for 2 h, then air-cool to room temperature. Then, use a four-high reversible cold rolling mill to perform initial cold rolling annealing, intermediate cold rolling annealing, and finish cold rolling in sequence; multiple passes are used for intermediate cold rolling annealing. Among them, the deformation amounts per pass of initial cold rolling annealing, intermediate cold rolling annealing, and finish cold rolling are 17%, 20%, and 25% respectively, and the rolling speed is 0.3 m / s. Initial cold rolling annealing and intermediate cold rolling annealing are annealed in a protective atmosphere continuous heat treatment furnace at a temperature of 1180 °C and a strip running speed of 0.5 m / min. Secondary solutionizing is heat-treated in a pure hydrogen protective atmosphere continuous annealing furnace at a temperature of 1180 °C and a strip running speed of 3 m / min; the aging treatment temperature is 700 °C, the time is 5 h, and the heating rate is 10 °C / min to obtain a 0.2-mm-thick precipitation-hardening nickel-based superalloy strip.

[0032] (Example 2) A method for preparing a precipitation-hardening nickel-based superalloy strip, the preparation steps are as follows: (1)Weigh and mix the alloy components according to the following mass percentages: carbon: 0.05%, boron 0.002%, aluminum: 1.5%, titanium: 1%, chromium: 20%, tungsten: 4.3%, molybdenum: 5.5%, tantalum: 4.3%, and the balance is nickel; (2) Melt the alloy components prepared in step (1) in a vacuum induction melting furnace with a vacuum degree of 0.4 Pa and a temperature of 1560 °C, then refine for 8 minutes. After the refining is completed, deoxidize, pour out of the furnace for casting, and solidify to obtain a nickel alloy billet. Among them, the deoxidizer is coke, and the addition amount of coke is 40% of the carbon mass in the alloy components; the casting temperature is 1410 °C; (3) Perform cogging forging on the nickel alloy billet obtained in step (2) at 1180 °C to obtain a nickel alloy plate. Among them, the deformation amount of each cogging forging pass is not less than 30%, and the final total deformation amount is not less than 70%; (4) Scrape off the surface scale of the nickel alloy plate obtained in step (3), with a turning depth of 0.8 nm. Then heat the rolling roll to 880 °C, and then perform hot rolling. The deformation amount of each pass is not less than 35%, and the final total deformation amount is not less than 80%. The roll speed is set at 42.5 mm / s to obtain a nickel-based alloy strip with a thickness of 3 mm; (5) Solutionize the nickel-based alloy strip obtained in step (4) in a vacuum at 1200 °C for 3 h, then air-cool to room temperature. Then, use a four-high reversible cold rolling mill to perform initial cold rolling annealing, intermediate cold rolling annealing, and finish cold rolling in sequence. The intermediate cold rolling annealing is carried out in multiple passes. Among them, the deformation amounts of each pass of the initial cold rolling annealing, intermediate cold rolling annealing, and finish cold rolling are 17%, 30%, and 30% respectively, and the rolling speed is 0.6 m / s. The initial cold rolling annealing and intermediate cold rolling annealing are annealed in a protective atmosphere continuous heat treatment furnace at a temperature of 1200 °C and a strip running speed of 2 m / min. The secondary solution treatment is heat-treated in a pure hydrogen protective atmosphere continuous annealing furnace at a temperature of 1200 °C and a strip running speed of 3.5 m / min; the aging treatment temperature is 750 °C, the time is 7 h, and the heating rate is 20 °C / min to obtain a precipitation-hardening nickel-based superalloy strip with a thickness of 0.2 mm.

[0033] (Example 3) A preparation method of a precipitation-hardening nickel-based superalloy strip, the preparation steps are as follows: (1) Weigh and prepare ingredients according to the following mass percentages of each alloy component: carbon: 0.07%, boron 0.002%, aluminum: 1.7%, titanium: 1.1%, chromium: 21%, tungsten: 4.4%, molybdenum: 5.64%, tantalum: 4.4%, and the balance is nickel; (2) Melt the alloy components prepared in step (1) in a vacuum induction melting furnace with a vacuum degree of 0.5 Pa and a temperature of 1570 °C, then refine for 10 minutes. After the refining is completed, deoxidize, pour out of the furnace for casting, and solidify to obtain a nickel alloy billet. Among them, the deoxidizer is coke, and the addition amount of coke is 50% of the carbon mass in the alloy components; the casting temperature is 1420 °C; (3) The nickel alloy billet obtained in step (2) is subjected to cogging forging at 1220 °C to obtain a nickel alloy plate, wherein the deformation per pass of the cogging forging is not less than 30%, and the final total deformation is not less than 70%; (4) The oxide scale on the surface of the nickel alloy plate obtained in step (3) is removed by turning with a depth of 1 nm. Subsequently, the rolling mill is heated to 900 °C, and then hot rolling is carried out. The deformation per pass is not less than 35%, and the final total deformation is not less than 80%. The roller speed is set at 42.5 mm / s to obtain a 3-mm-thick nickel-based alloy strip; (5) The nickel-based alloy strip obtained in step (4) is solution-treated in vacuum at 1210 °C for 4 h and then air-cooled to room temperature. Then, it is successively subjected to initial cold rolling annealing, intermediate cold rolling annealing, and finish cold rolling using a four-high reversible cold rolling mill; the intermediate cold rolling annealing is carried out by cold rolling in multiple passes. Among them, the deformation per pass of the initial cold rolling annealing, intermediate cold rolling annealing, and finish cold rolling is 17%, 40%, and 35% respectively, and the rolling speed is 1 m / s. The initial cold rolling annealing and intermediate cold rolling annealing are annealed using a protective atmosphere continuous heat treatment furnace at a temperature of 1250 °C and a strip running speed of 3.5 m / min. The secondary solution treatment is heat-treated using a pure hydrogen protective atmosphere continuous annealing furnace at a temperature of 1210 °C and a strip running speed of 4 m / min; the aging treatment temperature is 800 °C, the time is 8 h, and the heating rate is 30 °C / min to obtain a 0.2-mm-thick precipitation-hardening nickel-based superalloy strip.

[0034] (Comparative Example 1) A method for preparing a precipitation-hardening nickel-based superalloy strip, the preparation steps are as follows: (1) Weigh and prepare ingredients according to the mass percentages of the following alloy components: carbon: 0.05%, boron 0.002%, aluminum: 1.5%, titanium: 1%, chromium: 20%, tungsten: 4.3%, molybdenum: 6%, tantalum: 4.3%, and the balance is nickel; (2) The alloy components prepared in step (1) are melted using a vacuum induction melting furnace with a vacuum degree of 0.4 Pa and a temperature of 1560 °C and then refined for 8 min. After the refining is completed, deoxidation, pouring, and solidification are carried out to obtain a nickel alloy billet; among them, the deoxidizer is coke, and the addition amount of coke is 40% of the mass of carbon in the alloy components; the pouring temperature is 1410 °C; (3) The nickel alloy billet obtained in step (2) is subjected to cogging forging at 1180 °C to obtain a nickel alloy plate, wherein the deformation per pass of the cogging forging is not less than 30%, and the final total deformation is not less than 70%; (4) Scrape the scale on the surface of the nickel alloy plate obtained in step (3), with a turning depth of 0.8 nm. Then heat the rolling mill to 880 °C, and then conduct hot rolling. The deformation per pass is not less than 35%, and the final total deformation is not less than 80%. Set the roller speed to 42.5 mm / s to obtain a nickel-based alloy strip with a thickness of 3 mm; (5) Solutionize the nickel-based alloy strip obtained in step (4) in vacuum at 1200 °C for 3 h and then air-cool to room temperature. Then, use a four-high reversible cold rolling mill to conduct initial cold rolling annealing, intermediate cold rolling annealing, and finish cold rolling in sequence. The intermediate cold rolling annealing is carried out by cold rolling in multiple passes. Among them, the deformation per pass of the initial cold rolling annealing, intermediate cold rolling annealing, and finish cold rolling are 17%, 30%, and 30% respectively, the rolling speed is 0.6 m / s. The initial cold rolling annealing and intermediate cold rolling annealing are annealed using a protective atmosphere continuous heat treatment furnace at a temperature of 1200 °C and a strip running speed of 2 m / min. The secondary solutionizing is heat-treated using a pure hydrogen protective atmosphere continuous annealing furnace at a temperature of 1200 °C and a strip running speed of 3.5 m / min. The aging treatment temperature is 750 °C, the time is 7 h, and the heating rate is 20 °C / min to obtain a precipitation-hardened nickel-based superalloy strip with a thickness of 0.2 mm.

[0035] (Comparative Example 2) A preparation method of a precipitation-hardened nickel-based superalloy strip, and the preparation steps are as follows: (1) Weigh and mix ingredients according to the mass percentages of the following alloy components: carbon: 0.05%, boron: 0.002%, aluminum: 1.5%, titanium: 1%, chromium: 20%, tungsten: 4.3%, molybdenum: 5%, tantalum: 4.3%, and the balance is nickel; (2) Melt the alloy components prepared in step (1) using a vacuum induction melting furnace with a vacuum degree of 0.4 Pa and a temperature of 1560 °C, and then refine for 8 min. After the refining is completed, deoxidize, pour out the molten metal for casting, and solidify to obtain a nickel alloy square billet. Among them, the deoxidizer is coke, and the addition amount of coke is 40% of the mass of carbon in the alloy components; the casting temperature is 1410 °C; (3) Perform cogging forging on the nickel alloy square billet obtained in step (2) at 1180 °C to obtain a nickel alloy plate. Among them, the deformation per pass of the cogging forging is not less than 30%, and the final total deformation is not less than 70%; (4) Scrape the scale on the surface of the nickel alloy plate obtained in step (3), with a turning depth of 0.8 nm. Then heat the rolling mill to 880 °C, and then conduct hot rolling. The deformation per pass is not less than 35%, and the final total deformation is not less than 80%. Set the roller speed to 42.5 mm / s to obtain a nickel-based alloy strip with a thickness of 3 mm; (5) The nickel-based alloy strip after step (4) is solution-treated in vacuum at 1200 °C for 3 h and then air-cooled to room temperature. Subsequently, it is subjected to initial cold rolling annealing, intermediate cold rolling annealing, and finish cold rolling successively using a four-high reversible cold rolling mill. The intermediate cold rolling annealing is carried out in multiple passes. Among them, the deformation per pass of the initial cold rolling annealing, intermediate cold rolling annealing, and finish cold rolling is 17%, 30%, and 30% respectively, the rolling speed is 0.6 m / s. The initial cold rolling annealing and intermediate cold rolling annealing are annealed using a protective atmosphere continuous heat treatment furnace at a temperature of 1200 °C and a strip running speed of 2 m / min. The secondary solution treatment is heat-treated using a pure hydrogen protective atmosphere continuous annealing furnace at a temperature of 1200 °C and a strip running speed of 3.5 m / min. The aging treatment temperature is 750 °C, the time is 7 h, and the heating rate is 20 °C / min to obtain a precipitation-hardening nickel-based superalloy strip with a thickness of 0.2 mm.

[0036] (Comparative Example 3) A preparation method of a precipitation-hardening nickel-based superalloy strip, the preparation steps are as follows: (1) Weigh and mix the alloy components according to the following mass percentages: carbon: 0.05%, boron: 0.002%, aluminum: 1.5%, titanium: 1%, chromium: 20%, tungsten: 4.3%, molybdenum: 4.3%, tantalum: 4.3%, and the balance is nickel; (2) The alloy components prepared in step (1) are melted in a vacuum induction melting furnace with a vacuum degree of 0.4 Pa and a temperature of 1560 °C and then refined for 8 min. After the refining is completed, deoxidation, pouring, and solidification are carried out to obtain a nickel alloy square billet. Among them, the deoxidizer is coke, and the addition amount of coke is 40% of the carbon mass in the alloy components; the pouring temperature is 1410 °C; (3) The nickel alloy square billet obtained in step (2) is subjected to cogging forging at 1180 °C to obtain a nickel alloy plate. Among them, the deformation per pass of the cogging forging is not less than 30%, and the final total deformation is not less than 70%; (4) The oxide scale on the surface of the nickel alloy plate obtained in step (3) is removed by turning with a depth of 0.8 nm. Subsequently, the roll is heated to 880 °C, and then hot rolling is carried out. The deformation per pass is not less than 35%, and the final total deformation is not less than 80%. The roll speed is set at 42.5 mm / s to obtain a nickel-based alloy strip with a thickness of 3 mm; (5) The nickel-based alloy strip after step (4) is solution-treated in vacuum at 1200 °C for 3 h and then air-cooled to room temperature. Subsequently, it is subjected to initial cold rolling annealing, intermediate cold rolling annealing, and finish cold rolling successively using a four-high reversible cold rolling mill. The intermediate cold rolling annealing is carried out in multiple passes. Among them, the deformation per pass of the initial cold rolling annealing, intermediate cold rolling annealing, and finish cold rolling is 17%, 30%, and 30% respectively, the rolling speed is 0.6 m / s. The initial cold rolling annealing and intermediate cold rolling annealing are annealed using a protective atmosphere continuous heat treatment furnace at a temperature of 1200 °C and a strip running speed of 2 m / min. The secondary solution treatment is heat-treated using a pure hydrogen protective atmosphere continuous annealing furnace at a temperature of 1200 °C and a strip running speed of 3.5 m / min. The aging treatment temperature is 750 °C, the time is 7 h, and the heating rate is 20 °C / min to obtain a precipitation-hardening nickel-based superalloy strip with a thickness of 0.2 mm.

[0037] (Comparative Example 4) A preparation method of a precipitation-hardening nickel-based superalloy strip, the preparation steps are as follows: (1) Weigh and mix ingredients according to the mass percentages of the following alloy components: carbon: 0.05%, boron 0.002%, aluminum: 1.5%, titanium: 1%, chromium: 20%, tungsten: 4.3%, molybdenum: 8.6%, tantalum: 4.3%, and the balance is nickel; (2) The alloy components prepared in step (1) are melted in a vacuum induction melting furnace with a vacuum degree of 0.4 Pa and a temperature of 1560 °C and then refined for 8 min. After the refining is completed, deoxidation, pouring, and solidification are carried out to obtain a nickel alloy billet. Among them, the deoxidizer is coke, and the addition amount of coke is 40% of the mass of carbon in the alloy components; the pouring temperature is 1410 °C; (3) The nickel alloy billet obtained in step (2) is subjected to cogging forging at 1180 °C to obtain a nickel alloy plate. Among them, the deformation per pass of cogging forging is not less than 30%, and the final total deformation is not less than 70%; (4) The oxide scale on the surface of the nickel alloy plate obtained in step (3) is removed, the turning depth is 0.8 nm, and then the rolls are heated to 880 °C, and then hot rolling is carried out. The deformation per pass is not less than 35%, and the final total deformation is not less than 80%. The roll speed is set to 42.5 mm / s to obtain a nickel-based alloy strip with a thickness of 3 mm; (5) The nickel-based alloy strip obtained in step (4) is solutionized in vacuum at 1200 °C for 3 h and then air-cooled to room temperature. Subsequently, it is subjected to initial cold rolling annealing, intermediate cold rolling annealing, and finish cold rolling in turn using a four-high reversing cold rolling mill. The intermediate cold rolling annealing is carried out by cold rolling in multiple passes. Among them, the deformation per pass of the initial cold rolling annealing, intermediate cold rolling annealing, and finish cold rolling is 17%, 30%, and 30% respectively, the rolling speed is 0.6 m / s. The initial cold rolling annealing and intermediate cold rolling annealing are annealed using a protective atmosphere continuous heat treatment furnace at a temperature of 1200 °C and a strip running speed of 2 m / min. The secondary solution treatment is heat-treated using a pure hydrogen protective atmosphere continuous annealing furnace at a temperature of 1200 °C and a strip running speed of 3.5 m / min. The aging treatment temperature is 750 °C, the time is 7 h, and the heating rate is 20 °C / min to obtain a precipitation-hardening nickel-based superalloy strip with a thickness of 0.2 mm.

[0038] (Comparative Example 5) A preparation method of a precipitation-hardening nickel-based superalloy strip, the preparation steps are as follows: (1) Weigh and mix the alloy components according to the following mass percentages: carbon: 0.05%, boron: 0.002%, aluminum: 1.5%, titanium: 1%, chromium: 20%, tungsten: 4.3%, molybdenum: 5.5%, and the balance is nickel; (2) The alloy components prepared in step (1) are melted in a vacuum induction melting furnace with a vacuum degree of 0.4 Pa and a temperature of 1560 °C and then refined for 8 min. After the refining is completed, deoxidation, pouring, and solidification are carried out to obtain a nickel alloy billet. Among them, the deoxidizer is coke, and the addition amount of coke is 40% of the carbon mass in the alloy components; the pouring temperature is 1410 °C; (3) The nickel alloy billet obtained in step (2) is subjected to cogging forging at 1180 °C to obtain a nickel alloy plate. Among them, the deformation per pass of the cogging forging is not less than 30%, and the final total deformation is not less than 70%; (4) Scrape off the surface scale of the nickel alloy plate obtained in step (3), with a turning depth of 0.8 nm. Subsequently, the rolling rolls are heated to 880 °C, and then hot rolling is carried out. The deformation per pass is not less than 35%, and the final total deformation is not less than 80%. The roll speed is set at 42.5 mm / s to obtain a 3-mm-thick nickel-based alloy strip; (5) The nickel-based alloy strip obtained in step (4) is solution-treated in vacuum at 1200 °C for 3 h and then air-cooled to room temperature. Subsequently, it is subjected to initial cold rolling annealing, intermediate cold rolling annealing, and finish cold rolling successively using a four-high reversible cold rolling mill. The intermediate cold rolling annealing is carried out in multiple passes. Among them, the deformation per pass of the initial cold rolling annealing, intermediate cold rolling annealing, and finish cold rolling is 17%, 30%, and 30% respectively, the rolling speed is 0.6 m / s. The initial cold rolling annealing and intermediate cold rolling annealing are annealed using a protective atmosphere continuous heat treatment furnace at a temperature of 1200 °C and a strip running speed of 2 m / min. The secondary solution treatment is carried out using a pure hydrogen protective atmosphere continuous annealing furnace for heat treatment at a temperature of 1200 °C and a strip running speed of 3.5 m / min. The aging treatment temperature is 750 °C, the time is 7 h, and the heating rate is 20 °C / min to obtain a precipitation-hardening nickel-based superalloy strip with a thickness of 0.2 mm.

[0039] (Comparative Example 6) A preparation method of a precipitation-hardening nickel-based superalloy strip, the preparation steps are as follows: (1) Weigh and mix the alloy components according to the following mass percentages: carbon: 0.05%, boron: 0.002%, aluminum: 1.5%, titanium: 1%, chromium: 20%, tungsten: 4.3%, molybdenum: 5.5%, tantalum: 4.3%, and the balance is nickel; (2) The alloy components prepared in step (1) are melted in a vacuum induction melting furnace with a vacuum degree of 0.4 Pa and a temperature of 1560 °C and then refined for 8 min. After the refining is completed, deoxidation, pouring, and solidification are carried out to obtain a nickel alloy billet. Among them, the deoxidizer is coke, and the addition amount of coke is 40% of the mass of carbon in the alloy components; the pouring temperature is 1410 °C; (3) The nickel alloy billet obtained in step (2) is subjected to cogging forging at 1180 °C to obtain a nickel alloy plate. Among them, the deformation per pass of the cogging forging is not less than 30%, and the final total deformation is not less than 70%; (4) The surface scale of the nickel alloy plate obtained in step (3) is removed, the turning depth is 0.8 nm, and then the rolls are heated to 880 °C, and then hot rolling is carried out. The deformation per pass is not less than 35%, and the final total deformation is not less than 80%. The roll speed is set at 42.5 mm / s to obtain a nickel-based alloy strip with a thickness of 3 mm; (5) The nickel-based alloy strip after step (4) is solution-treated in vacuum at 1200 °C for 3 h and then air-cooled to room temperature. Subsequently, it is subjected to initial cold rolling annealing, intermediate cold rolling annealing, and finish cold rolling successively using a four-high reversible cold rolling mill. The intermediate cold rolling annealing is carried out in multiple passes. Among them, the deformation per pass of the initial cold rolling annealing, intermediate cold rolling annealing, and finish cold rolling is 17%, 30%, and 30% respectively, the rolling speed is 0.6 m / s. The initial cold rolling annealing and intermediate cold rolling annealing are annealed using a protective atmosphere continuous heat treatment furnace at a temperature of 1200 °C and a strip running speed of 2 m / min. The secondary solution treatment is carried out using a pure hydrogen protective atmosphere continuous annealing furnace for heat treatment at a temperature of 1200 °C and a strip running speed of 3.5 m / min to obtain a precipitation-hardening nickel-based superalloy strip with a thickness of 0.2 mm.

[0040] (Effect example) Tensile strength, tensile strength at high temperature: The precipitation-hardening nickel-based superalloy strips prepared in the examples and comparative examples are respectively tested for tensile strength and tensile strength at high temperature according to "GB / T 228.1-2015 Metallic materials - Tensile testing - Part 1: Method of test at room temperature" and "GB / T 228.2-2015 Metallic materials - Tensile testing - Part 2: Method of test at elevated temperature".

[0041] Corrosion resistance: The precipitation-hardening nickel-based superalloy strips prepared in the examples and comparative examples with a size of 10 mm * 10 mm * 1 mm are selected. The surface is polished and buffed to ensure a smooth and defect-free surface. A marine gas corrosion environment is simulated, mainly including high temperature, high humidity, salt content, and complex gas components. The experimental temperature is set at 900 °C, the sodium sulfate salt spray concentration is 50 ppm, and the corrosion time is 25 hours. Before and after the corrosion test, the sample mass is weighed using a high-precision electronic balance, and the corrosion weight loss value is calculated.

[0042] The following Table 1 shows the performance test results of the precipitation-hardening nickel-based superalloy strips prepared in the examples and comparative examples: Table 1

[0043] It can be seen from the above that the precipitation-hardening nickel-based superalloy strips of Examples 1 to 3 have better mechanical properties at room temperature and high temperature and better corrosion resistance.

[0044] The differences between Comparative Examples 1 to 4 and Example 2 are only that the mass ratios of tungsten to molybdenum in the precipitation-hardening nickel-based superalloy strips of Comparative Examples 1 to 4 are 0.71, 0.86, 1, and 0.5 respectively, rather than 0.78. The mechanical properties at room temperature and high temperature of the precipitation-hardening nickel-based superalloy strips of Comparative Examples 1 to 4 are weaker than those of Example 2.

[0045] The difference between Comparative Example 5 and Example 2 is only that tantalum is not added to the precipitation-hardening nickel-based superalloy strip in Comparative Example 5, and the room-temperature, high-temperature mechanical properties and corrosion resistance of the precipitation-hardening nickel-based superalloy strip in Comparative Example 5 are weaker than those in Example 2.

[0046] The difference between Comparative Example 6 and Example 2 is only that two-stage aging treatment is not carried out during the secondary solution treatment in the preparation process of the precipitation-hardening nickel-based superalloy strip in Comparative Example 6, and the room-temperature and high-temperature mechanical properties of the precipitation-hardening nickel-based superalloy strip in Comparative Example 6 are weaker than those in Example 2.

[0047] In summary, the precipitation-hardening nickel-based superalloy strip prepared by the present invention has better room-temperature and high-temperature mechanical properties and better corrosion resistance, which are enhanced by the synergistic effect of adding component tantalum, controlling the mass ratio of tungsten to molybdenum at 0.78, and carrying out aging treatment during secondary solution treatment.

[0048] The specific embodiments described above have further detailed the purpose, technical solution and beneficial effects of the present invention. It should be understood that the above are only specific embodiments of the present invention and are not used to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A precipitation-hardening nickel-based superalloy strip, characterized in that, The alloy components by mass percentage include carbon: 0.03 - 0.07%, boron ≤ 0.002%, aluminum: 1.3 - 1.7%, titanium: 0.9 - 1.1%, chromium: 19 - 21%, tungsten: 4.2 - 4.4%, molybdenum: 5.38 - 5.64%, tantalum: 4.2 - 4.4%, and the balance is nickel.

2. The precipitation hardening nickel-based superalloy strip according to claim 1, wherein The mass ratio of tungsten to molybdenum is 0.

78.

3. The precipitation hardening nickel-based superalloy strip according to claim 1, characterized in that, The precipitation-hardening nickel-based superalloy strip is obtained by melting and refining the raw materials of each component in Claim 1 in a vacuum induction furnace, followed by cogging forging, hot rolling, and then successively performing primary solution treatment, three-stage cold rolling and annealing, finish annealing, secondary solution treatment, and aging treatment.

4. A method for preparing a precipitation-hardening nickel-based superalloy strip according to any one of claims 1 to 3, characterized in that, The preparation steps are as follows: (1) Weigh and proportion the alloy components according to the mass percentages of the foregoing alloy components; (2) Melt the alloy components prepared in step (1) in a vacuum induction melting furnace and refine for 5 - 10 min. After the refining is completed, deoxidize, pour out for casting, and solidify to obtain a nickel alloy ingot; (3) Perform cogging forging on the nickel alloy ingot obtained in step (2) at 1150 - 1220 °C to obtain a nickel alloy plate. Among them, the deformation amount of each pass of cogging forging is not less than 30%, and the final total deformation amount is not less than 70%; (4) Scrape off the surface oxide scale of the nickel alloy plate obtained in step (3), with a turning depth of 0.5 - 1 nm. Then heat the rolling rolls to 980 - 1000 °C, and then perform hot rolling. The deformation amount of each pass is not less than 35%, and the final total deformation amount is not less than 80%. Set the roll speed to 42.5 mm / s to obtain a nickel-based alloy strip; (5) Perform primary solution treatment, three-stage cold rolling and annealing, secondary solution treatment, and aging treatment on the nickel-based alloy strip obtained in step (4) in sequence to obtain a precipitation-hardening nickel-based superalloy strip.

5. The preparation method of the precipitation-hardening nickel-based superalloy strip according to claim 4, wherein, The vacuum degree of the vacuum induction melting furnace is 0.3 - 0.5 Pa, and the temperature is 1550 - 1570 °C.

6. The preparation method of the precipitation-hardening nickel-based superalloy strip according to claim 4, wherein, The casting temperature is 1400 - 1420 °C.

7. The preparation method of the precipitation-hardening nickel-based superalloy strip according to claim 4, wherein, The temperature of the primary solution treatment is 1180 - 1210 °C, and the solution treatment time is 2 - 4 h.

8. The method for preparing a precipitation-hardening nickel-based superalloy strip according to claim 4, characterized in that, The three-stage cold rolling and annealing are carried out by a four-high reversible cold rolling mill. The specific steps include initial cold rolling and annealing, intermediate cold rolling and annealing, and finish cold rolling. The intermediate cold rolling and annealing are carried out in multiple passes. Among them, the deformation amounts of each pass of the initial cold rolling and annealing, intermediate cold rolling and annealing, and finish cold rolling are 17%, 20 - 40%, and 25 - 35% respectively, and the rolling speed is 0.3 - 1 m / s.

9. The method for preparing a precipitation-hardening nickel-based superalloy strip according to claim 8, wherein, The initial cold rolling and annealing and intermediate cold rolling and annealing are annealed in a protective atmosphere continuous heat treatment furnace at a temperature of 1180 - 1250 °C, and the strip running speed is 0.5 - 3.5 m / min.

10. The preparation method of the precipitation-hardening nickel-based superalloy strip according to claim 4, characterized in that, The secondary solution treatment is heat-treated in a pure hydrogen protective atmosphere continuous annealing furnace at a temperature of 1180 - 1210 °C, and the strip running speed is 3 - 4 m / min; the aging treatment temperature is 700 - 800 °C, the time is 5 - 8 h, and the heating rate is 10 - 30 °C / min.

Images