Solution strengthening type difficult-to-deform nickel-based high-temperature alloy strip and preparation process thereof

Abstract

The invention discloses a solid solution strengthening type difficult-to-deform nickel-based high-temperature alloy strip and a preparation process thereof, and belongs to the technical field of nickel material processing. The solid solution strengthening type difficult-to-deform nickel-based high-temperature alloy strip prepared by the invention comprises the following components in percentage by mass: 0.07 to 0.08 percent of carbon, 0.33 to 0.35 percent of silicon, 0.46 to 0.48 percent of manganese, 21.7 to 22.3 percent of chromium, 0.05 to 0.06 percent of cobalt, 0.34 to 0.36 percent of aluminum, 1.30 to 1.31 percent of molybdenum, 0.26 to 0.27 percent of iron, 13.85 to 13.86 percent of tungsten, 3.23 to 4.40 percent of titanium and the balance of nickel. The preparation method comprises the following steps: melting silicon, manganese, chromium, molybdenum, iron, cobalt, tungsten and nickel in a vacuum induction melting furnace, refining and deoxidizing; after deoxidation, adding carbon, aluminum and titanium under the conditions of argon protection and laser irradiation, stirring, discharging, casting, solidifying and homogenizing; and then cogging forging is carried out, after high-temperature rolling is carried out under the electric pulse condition, first-time solid solution heat treatment, acid pickling, cold rolling annealing and finished product heat treatment are sequentially carried out, and the solid solution strengthening type difficult-to-deform nickel-based high-temperature alloy strip is obtained.

Description

Technical Field

[0001] The present invention relates to a solution-strengthened difficult-to-deform nickel-based superalloy strip and a preparation process thereof. Background Art

[0002] With the rapid development of modern aerospace, aviation, nuclear power and other cutting-edge technologies, the performance requirements for materials in extreme environments are increasing day by day. Nickel-based superalloys have been widely used in the manufacture of key high-temperature-resistant components such as combustion chambers and flame tubes due to their excellent oxidation resistance, corrosion resistance and high-temperature mechanical properties. However, the tensile strength of traditional nickel-based superalloy strips under high-temperature conditions is not satisfactory, which has become one of the main bottlenecks restricting their further application.

[0003] Solution-strengthened nickel-based alloys are obtained by adding a certain amount of alloying elements (such as tungsten W, chromium Cr, cobalt Co, molybdenum Mo, etc.) to nickel-based alloys, so that these elements form solid solutions in the nickel matrix, thereby achieving the effect of strengthening the alloy. This strengthening method is mainly based on the interaction between alloying elements and the nickel matrix, which not only improves the hardness and strength of the alloy, but also improves its stability under high-temperature conditions. The formed single-phase austenite structure endows this type of alloy with excellent thermal stability and mechanical properties, enabling it to maintain a high performance level in extreme environments.

[0004] Nevertheless, nickel-based superalloy strips still face challenges in practical applications. Especially under high-temperature conditions, the material is prone to creep, that is, plastic deformation that gradually occurs over time under stress, which poses a potential threat to equipment operating in high-temperature environments for a long time. In addition, how to further improve the tensile strength of nickel-based superalloy strips without sacrificing other important properties is also a key research direction at present.

[0005] Therefore, the present invention aims to propose a solution-strengthened difficult-to-deform nickel-based superalloy strip and a preparation process thereof to solve the above problems. Summary of the Invention

[0006] The object of the present invention is to provide a solution-strengthened difficult-to-deform nickel-based superalloy strip and a preparation process thereof to solve the technical problems mentioned in the above background art.

[0007] The technical solution for achieving the object of the present invention is as follows: In the first aspect, the present invention discloses a solution-strengthened refractory nickel-based superalloy strip. The composition by mass fraction includes: carbon: 0.07 - 0.08%, silicon: 0.33 - 0.35%, manganese: 0.46 - 0.48%, chromium: 21.7 - 22.3%, cobalt: 0.05 - 0.06%, aluminum: 0.34 - 0.36%, molybdenum: 1.30 - 1.31%, iron: 0.26 - 0.27%, tungsten: 13.85 - 13.86%, and the balance is nickel.

[0008] The main functions of various alloying elements in nickel-based alloys are as follows: Nickel: As a solvent, it can dissolve various elements while keeping the matrix in a face-centered cubic lattice structure. Increasing the nickel content can improve the thermal stability, corrosion resistance, workability, and weldability of the alloy; Chromium: It is an essential alloying element for superalloys, has a high solubility in the matrix, and has a certain solution strengthening effect; Secondly, it combines with carbon to form M 23 C6 carbides at grain boundaries, improving the mechanical properties of the alloy; In addition, chromium can react with oxygen to form a chromium sesquioxide protective layer, improving the high-temperature oxidation resistance, heat resistance, and corrosion resistance of the alloy; Cobalt: It reduces the stacking fault energy of the matrix, but also reduces the solubility of elements such as aluminum and titanium in the matrix, increases the solid solution temperature of the precipitated phase γ', and improves the high-temperature mechanical properties of the alloy; Iron: It reduces the alloy cost and the linear expansion coefficient of the matrix, but increases the tendency to form σ phase; Manganese: A deoxidizer during the melting process; Molybdenum: It is mainly dissolved in the matrix, reduces the stacking fault energy of the matrix, and has a strong solution strengthening effect; And molybdenum has a small diffusion rate in the alloy, which is beneficial to improving its high-temperature creep strength; Molybdenum can also improve the alloy's resistance to corrosion by reducing acids; Tungsten: It is an important solution strengthening element of the alloy, which can effectively improve the creep properties of superalloys; Aluminum: It is an element that forms γ' phase, which can improve the high-temperature strength, oxidation resistance, and sulfidation resistance of the alloy; Titanium: It is an element that forms γ' phase, which can improve the creep resistance of the material; Carbon: By generating stable carbides at grain boundaries, it improves the high-temperature strength of the alloy; Silicon: It can form Ni3Si, improving the alloy strength.

[0009] Further, the solution-strengthened difficult-to-deform nickel-based superalloy strip is prepared by first melting silicon, manganese, chromium, molybdenum, iron, cobalt, tungsten, and nickel in a vacuum induction melting furnace, followed by refining and deoxidation; after deoxidation, under the conditions of argon protection and laser irradiation, carbon, aluminum, and titanium are added, stirred, and then taken out of the furnace for casting, solidification, and homogenization treatment; subsequently, ingot forging is carried out, and then hot rolling is carried out under the condition of electric pulse, followed by solution heat treatment, surface pickling, cold rolling annealing, and finished product heat treatment to obtain the solution-strengthened difficult-to-deform nickel-based superalloy strip.

[0010] In the second aspect, a preparation process of the solution-strengthened difficult-to-deform nickel-based superalloy strip as described in the first aspect, the process steps include: (1) Preparation of nickel alloy billet: Take carbon: 0.07~0.08%, silicon: 0.33~0.35%, manganese: 0.46~0.48%, chromium: 21.7~22.3%, cobalt: 0.05~0.06%, aluminum: 0.34~0.36%, molybdenum: 1.30~1.31%, iron: 0.26~0.27%, tungsten: 13.85~13.86%, titanium: 3.23~4.40% by mass percentage, and the balance is nickel; then put silicon, manganese, chromium, molybdenum, iron, cobalt, tungsten, and nickel into a vacuum induction melting furnace to be completely melted, followed by refining for 20~40 min, adding a deoxidizer for deoxidation after refining, and under the conditions of argon protection and laser irradiation, adding carbon, aluminum, and titanium, stirring for 4~6 min, then taking out of the furnace for casting, solidification, homogenization treatment, and air cooling to room temperature to obtain a nickel alloy billet; (2) Open-die forging the nickel alloy billet obtained in step (1) at 1120~1160 °C to obtain a nickel alloy plate, wherein the deformation amount per pass of the open-die forging is not less than 30%, and the final total deformation amount is not less than 70%; (3) Scrape off the surface oxide scale of the nickel alloy plate obtained in step (2), with a turning depth of 0.5~0.8 nm, then heat the rolling rolls to 1120~1160 °C, and carry out hot rolling under the condition of electric pulse, with the deformation amount per pass not less than 35%, and the final total deformation amount not less than 80%, and set the roll speed to 42.5 mm / s to obtain a nickel-based alloy strip; (4) Subject the nickel-based alloy strip obtained in step (3) to first solution heat treatment, pickling, cold rolling annealing, and finished product heat treatment in sequence to obtain the solution-strengthened difficult-to-deform nickel-based superalloy strip.

[0011] Further, the vacuum degree of the vacuum induction melting furnace is 0.3~0.5 Pa.

[0012] Further, the deoxidizer includes coke and nickel-magnesium alloy, and the mass ratio of coke to nickel-magnesium alloy is 80~120:300~400; wherein, the addition amount of coke is 30~50% of the mass of carbon element in the composition of the solution-strengthened difficult-to-deform nickel-based superalloy strip.

[0013] Furthermore, the single-pulse energy of the laser radiation is 10~20 μJ, the frequency is 0.5~2.5 MHz, the scanning pitch is 10~50 μm, and the scanning speed is 1000~5000 mm / s.

[0014] Furthermore, the casting temperature is 1400~1600 °C; the homogenization treatment temperature is 1050~1110 °C, and the homogenization treatment time is 24~72 h.

[0015] Furthermore, the electric pulse voltage is 24 V, the pulse width is 100 μs, and the frequency is 500 Hz.

[0016] Furthermore, the cold rolling and annealing steps are as follows: The strip blank is rolled in multiple passes using a four-high reversible cold rolling mill. Among them, the deformation rate of the first cold rolling is controlled at about 17%, the intermediate cold rolling deformation rate of each subsequent pass is controlled at 20~43%, and the final cold rolling deformation rate is controlled at about 25%; between every two passes of cold rolling, continuous heat treatment annealing is carried out using a protective atmosphere furnace, the annealing temperature is 1150~1250 °C, and the moving speed is 0.5~1.5 m / min; by controlling the deformation rates of the first cold rolling, intermediate cold rolling, and final cold rolling, the work hardening effect is optimized.

[0017] Furthermore, the finished product heat treatment uses a continuous heat treatment furnace with a pure hydrogen protective atmosphere, the annealing temperature is 950~980 °C, and the moving speed is 2.0 m / min.

[0018] Adopting the above technical solutions, the present invention has the following beneficial effects: (1) The solution-strengthened difficult-to-deform nickel-based superalloy strip prepared by the present invention, by mass fraction, the composition includes: carbon: 0.07~0.08%, silicon: 0.33~0.35%, manganese: 0.46~0.48%, chromium: 21.7~22.3%, cobalt: 0.05~0.06%, aluminum: 0.34~0.36%, molybdenum: 1.30~1.31%, iron: 0.26~0.27%, tungsten: 13.85~13.86%, titanium: 3.23~4.40%, and the balance is nickel; the nickel-based superalloy strip solution-strengthened by molybdenum and tungsten in the present invention, M6C carbide has good thermal stability in nickel-based, and at the same time introducing titanium can form γ' phase to improve the creep resistance of the material. The solution-strengthened difficult-to-deform nickel-based superalloy strip prepared by the present invention has a higher tensile strength and better high-temperature resistance.

[0019] (2) The solid solution strengthened nickel-based high temperature alloy strip of the present invention first melts silicon, manganese, chromium, molybdenum, iron, cobalt, tungsten and nickel in a vacuum induction melting furnace, and then refines and deoxidizes them; after deoxidation, carbon, aluminum and titanium are added and stirred under argon protection and laser irradiation, and then cast, solidify and homogenize them; then, the strip is forged, and then high-temperature rolled under electric pulse conditions, and then solid solution heat treatment, pickling, cold rolling annealing and finished product heat treatment are carried out in sequence to obtain the solid solution strengthened nickel-based high temperature alloy strip; the solid solution strengthened nickel-based high temperature alloy strip prepared by the present invention has higher tensile strength and better high temperature resistance.

[0020] (3) The solid solution strengthened hard-to-deform nickel-based high-temperature alloy strip of the present invention is subjected to laser irradiation during the stirring and melting process of carbon, aluminum and titanium. The shared electrons of the metal crystals produce inelastic collisions with photons in the laser beam and absorb the photons, causing the electron energy to leap and strengthen the lattice oscillation. The temperature of the alloy layer increases, the activity increases, and it is helpful to form crystal nuclei, promote grain refinement, reduce intergranular and grain boundary defects, and improve the tensile strength of the solid solution strengthened hard-to-deform nickel-based high-temperature alloy strip.

[0021] (4) In the preparation process of the present invention, high-temperature rolling is performed under electric pulse conditions, and the dislocation density in the obtained solid solution strengthened difficult-to-deform nickel-based high-temperature alloy strip is increased. When stress is applied, the mutual intersection between dislocations increases the resistance to dislocation movement and hinders dislocation movement; the entanglement and intersection between high-density dislocations will form dislocation cells, which have a pinning effect on dislocation movement; on the other hand, the number of interfaces between the refined grains increases, and when a dislocation passes through the grain boundary from one grain to another grain with a different grain boundary orientation, it must change its movement direction at the grain boundary, which greatly hinders the dislocation movement; under the combined effect of grain boundary strengthening, dislocation intersection and pinning, the tensile strength of the solid solution strengthened difficult-to-deform nickel-based high-temperature alloy strip is further improved.

[0022] (5) In the cold rolling process, the present invention controls the deformation amount of each pass so that the strip structure undergoes recrystallization in each pass without producing defects such as cracks and pits; intermediate annealing can eliminate cold rolling stress and restore machinability; heat treatment of the finished product achieves a balance between hardness retention and plasticity improvement, breaking through the traditional recovery temperature theory and having the advantages of high dimensional accuracy and smooth strip surface, saving raw materials and labor hours, and having a simple process, economy and good benefits. DETAILED DESCRIPTION

[0023] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with specific implementation methods.

[0024] Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0025] The following embodiments are only used to more clearly illustrate the technical solutions of the present invention and shall not be used to limit the protection scope of the present invention.

[0026] (Embodiment 1) A preparation process of a solution-strengthened difficult-to-deform nickel-based superalloy strip, the process steps include: (1) Preparation of nickel alloy billet: Take carbon: 0.07%, silicon: 0.33%, manganese: 0.46%, chromium: 21.7%, cobalt: 0.05%, aluminum: 0.34%, molybdenum: 1.30%, iron: 0.26%, tungsten: 13.85%, titanium: 4.40% by mass percentage, and the balance is nickel; then put silicon, manganese, chromium, molybdenum, iron, cobalt, tungsten, and nickel into a vacuum induction melting furnace with a vacuum degree of 0.3 Pa and a temperature of 1580 °C to be completely melted and then refined for 20 min. After refining, a deoxidizer is added for deoxidation. After deoxidation, under the conditions of argon protection and laser irradiation, carbon, aluminum, and titanium are added, stirred for 4 min, and then cast out at a casting temperature of 1400 °C, solidified, homogenized at 1050 °C for 24 h, and air-cooled to room temperature to obtain a nickel alloy billet; wherein, the single-pulse energy of the laser radiation is 10 μJ, the frequency is 0.5 MHz, the scanning pitch is 10 μm, and the scanning speed is 1000 mm / s; wherein, the deoxidizer includes coke and nickel-magnesium alloy, and the mass ratio of coke to nickel-magnesium alloy is 80:300; wherein, the addition amount of coke is 30% of the mass of carbon element in the composition of the solution-strengthened difficult-to-deform nickel-based superalloy strip; (2) The nickel alloy billet obtained in step (1) is subjected to cogging forging at 800 °C to obtain a nickel alloy plate, wherein the deformation amount per pass of the cogging forging is 33%, and the final total deformation amount is 80%; (3) The surface oxide scale of the nickel alloy plate obtained in step (2) is removed, the turning depth is 0.5 nm, and then the rolling mill rolls are heated to 700 °C and hot-rolled under the condition of electric pulse, with the deformation amount per pass being 35% and the final total deformation amount being 82%, and the roll speed is set to 42.5 mm / s to obtain a 3-mm-thick nickel-based alloy strip; wherein, the electric pulse voltage is 24 V, the pulse width is 100 μs, and the frequency is 500 Hz; (4) The nickel-based alloy strip after step (3) is solution-treated at 1150 °C for 40 min, then air-cooled to room temperature, surface pickled, and then the strip blank is rolled in multiple passes using a four-high reversible cold rolling mill. Among them, the initial cold rolling deformation rate is controlled at 17%, the intermediate cold rolling deformation rate for each subsequent pass is controlled at 20%, and the final cold rolling controlled deformation rate is controlled at 25%; between every two passes of cold rolling, continuous heat treatment annealing is carried out using a protective atmosphere nitrogen continuous heat treatment furnace, the annealing temperature is 1150 °C, the moving speed is 0.5 m / min, and then the finished product obtained by cold rolling annealing is subjected to finished product heat treatment using a pure hydrogen protective atmosphere continuous heat treatment furnace, the annealing temperature is 950 °C, the moving speed is 2.0 m / min, to obtain a solution-strengthened difficult-to-deform nickel-based superalloy strip with a thickness of 0.3 mm.

[0027] (Example 2) A preparation process of a solution-strengthened difficult-to-deform nickel-based superalloy strip, the process steps include: (1) Preparation of nickel alloy billet: Take carbon: 0.075%, silicon: 0.34%, manganese: 0.47%, chromium: 22%, cobalt: 0.055%, aluminum: 0.35%, molybdenum: 1.305%, iron: 0.265%, tungsten: 13.85%, titanium: 3.50% by mass percentage, and the balance is nickel; then put silicon, manganese, chromium, molybdenum, iron, cobalt, tungsten, and nickel into a vacuum induction melting furnace with a vacuum degree of 0.4 Pa and a temperature of 1580 °C to be completely melted and then refined for 30 min. After refining, a deoxidizer is added for deoxidation. After deoxidation, under the conditions of argon protection and laser irradiation, carbon, aluminum, and titanium are added, stirred for 5 min, and then cast out at a casting temperature of 1500 °C, solidified, homogenized at 1180 °C for 48 h, and air-cooled to room temperature to obtain a nickel alloy billet; among them, the single pulse energy of the laser radiation is 15 μJ, the frequency is 2 MHz, the scanning pitch is 30 μm, and the scanning speed is 4000 mm / s; among them, the deoxidizer includes coke and nickel-magnesium alloy, and the mass ratio of coke to nickel-magnesium alloy is 100:350; among them, the addition amount of coke is 40% of the mass of carbon element in the composition of the solution-strengthened difficult-to-deform nickel-based superalloy strip. (2) The nickel alloy billet obtained in step (1) is subjected to cogging forging at 900 °C to obtain a nickel alloy plate, among which the deformation amount for each pass of cogging forging is 33%, and the final total deformation amount is 80%. (3) The surface oxide scale of the nickel alloy plate obtained in step (2) is removed by turning, the turning depth is 0.7 nm, and then the roll is heated to 750 °C and hot rolled under the condition of electric pulse, the deformation amount for each pass is 35%, the final total deformation amount is 82%, and the roll speed is set at 42.5 mm / s to obtain a 3-mm-thick nickel-based alloy strip; among them, the electric pulse voltage is 24 V, the pulse width is 100 μs, and the frequency is 500 Hz. (4) The nickel-based alloy strip obtained in step (3) is solution-treated at 1200 °C for 50 min, then air-cooled to room temperature, surface pickled, and then the strip blank is rolled in multiple passes using a four-high reversible cold rolling mill. Among them, the first cold rolling deformation rate is controlled at 17%, the intermediate cold rolling deformation rate of each subsequent pass is controlled at 30%, and the final cold rolling deformation rate is controlled at 25%; between every two passes of cold rolling, continuous heat treatment annealing is carried out using a protective atmosphere nitrogen continuous heat treatment furnace, the annealing temperature is 1200 °C, the moving speed is 1 m / min, and then the finished product obtained by cold rolling annealing is subjected to finished product heat treatment using a pure hydrogen protective atmosphere continuous heat treatment furnace, the annealing temperature is 965 °C, and the moving speed is 2.0 m / min to obtain a solution-strengthened and difficult-to-deform nickel-based superalloy strip with a thickness of 0.3 mm.

[0028] (Example 3) A preparation process for a solution-strengthened and difficult-to-deform nickel-based superalloy strip, the process steps include: (1) Preparation of nickel alloy billet: By mass percentage, take carbon: 0.08%, silicon: 0.35%, manganese: 0.48%, chromium: 22.3%, cobalt: 0.06%, aluminum: 0.36%, molybdenum: 1.31%, iron: 0.27%, tungsten: 13.86%, titanium: 3.23%, and the balance is nickel; then put silicon, manganese, chromium, molybdenum, iron, cobalt, tungsten, and nickel into a vacuum induction melting furnace with a vacuum degree of 0.5 Pa and a temperature of 1580 °C to be completely melted and then refined for 40 min. After refining, a deoxidizer is added for deoxidation. After deoxidation, under the conditions of argon protection and laser irradiation, carbon, aluminum, and titanium are added, stirred for 6 min, and then cast out at a casting temperature of 1600 °C, solidified, homogenized at 1110 °C for 72 h, and air-cooled to room temperature to obtain a nickel alloy billet; among them, the single-pulse energy of the laser radiation is 20 μJ, the frequency is 2.5 MHz, the scanning spacing is 50 μm, and the scanning speed is 5000 mm / s; among them, the deoxidizer includes coke and nickel-magnesium alloy, and the mass ratio of coke to nickel-magnesium alloy is 120:400; among them, the addition amount of coke is 50% of the mass of the carbon element in the composition of the solution-strengthened and difficult-to-deform nickel-based superalloy strip. (2) The nickel alloy billet obtained in step (1) is subjected to cogging forging at 1000 °C to obtain a nickel alloy plate, among which, the deformation amount of each pass of cogging forging is 33%, and the final total deformation amount is 80%. (3) The surface oxide scale of the nickel alloy plate obtained in step (2) is removed by turning, the turning depth is 0.8 nm, and then the roll is heated to 800 °C and hot-rolled under the condition of electric pulse, the deformation amount of each pass is 35%, the final total deformation amount is 82%, and the roll speed is set at 42.5 mm / s to obtain a nickel-based alloy strip with a thickness of 3 mm; among them, the electric pulse voltage is 24 V, the pulse width is 100 μs, and the frequency is 500 Hz. (4) The nickel-based alloy strip obtained in step (3) is solution-treated at 1200 °C for 50 min, then air-cooled to room temperature, surface pickled, and then the strip blank is rolled in multiple passes using a four-high reversible cold rolling mill. Among them, the initial cold rolling deformation rate is controlled at 17%, the intermediate cold rolling deformation rate of each subsequent pass is controlled at 43%, and the final cold rolling deformation rate is controlled at 25%; between every two passes of cold rolling, continuous heat treatment furnace annealing is carried out using protective atmosphere nitrogen, the annealing temperature is 1250 °C, the moving speed is 1.5 m / min, and then the finished product obtained by cold rolling and annealing is subjected to finished product heat treatment using a continuous heat treatment furnace with a pure hydrogen protective atmosphere, the annealing temperature is 980 °C, the moving speed is 2.0 m / min, and a solution-strengthened and difficult-to-deform nickel-based superalloy strip with a thickness of 0.3 mm is obtained.

[0029] (Comparative Example 1) A preparation process for a solution-strengthened and difficult-to-deform nickel-based superalloy strip, the process steps include: (1) Preparation of nickel alloy billet: By mass percentage, take carbon: 0.075%, silicon: 0.34%, manganese: 0.47%, chromium: 22%, cobalt: 0.055%, aluminum: 0.35%, molybdenum: 1.305%, iron: 0.265%, tungsten: 13.85%, and the balance is nickel; then put silicon, manganese, chromium, molybdenum, iron, cobalt, tungsten, and nickel into a vacuum induction melting furnace with a vacuum degree of 0.4 Pa and a temperature of 1580 °C to be completely melted and then refined for 30 min. After refining, a deoxidizer is added for deoxidation. After deoxidation, under the conditions of argon protection and laser irradiation, carbon and aluminum are added, stirred for 5 min, and then cast out, solidified at a casting temperature of 1500 °C, homogenized at 1180 °C for 48 h, and air-cooled to room temperature to obtain a nickel alloy billet; among them, the single-pulse energy of the laser radiation is 15 μJ, the frequency is 2 MHz, the scanning pitch is 30 μm, and the scanning speed is 4000 mm / s; among them, the deoxidizer includes coke and nickel-magnesium alloy, and the mass ratio of coke to nickel-magnesium alloy is 100:350; among them, the addition amount of coke is 40% of the mass of carbon element in the composition of the solution-strengthened and difficult-to-deform nickel-based superalloy strip. (2) The nickel alloy billet obtained in step (1) is subjected to cogging forging at 900 °C to obtain a nickel alloy plate, among which the deformation amount of each pass of cogging forging is 33%, and the final total deformation amount is 80%. (3) The surface oxide scale of the nickel alloy plate obtained in step (2) is removed by turning, the turning depth is 0.7 nm, and then the roll is heated to 750 °C and hot rolled under the condition of electric pulse, the deformation amount of each pass is 35%, the final total deformation amount is 82%, and the roll speed is set at 42.5 mm / s to obtain a 3-mm-thick nickel-based alloy strip; among them, the electric pulse voltage is 24 V, the pulse width is 100 μs, and the frequency is 500 Hz. (4) The nickel-based alloy strip obtained in step (3) is solution-treated at 1200 °C for 50 min, then air-cooled to room temperature, surface pickled, and then the strip blank is rolled in multiple passes using a four-high reversible cold rolling mill. Among them, the deformation rate of the first cold rolling is controlled at 17%, the intermediate cold rolling deformation rate of each subsequent pass is controlled at 30%, and the final cold rolling deformation rate is controlled at 25%; between every two passes of cold rolling, continuous heat treatment annealing is carried out using a protective atmosphere nitrogen continuous heat treatment furnace, the annealing temperature is 1200 °C, the moving speed is 1 m / min, and then the finished product obtained by cold rolling and annealing is subjected to finished product heat treatment using a pure hydrogen protective atmosphere continuous heat treatment furnace, the annealing temperature is 965 °C, and the moving speed is 2.0 m / min to obtain a solution-strengthened difficult-to-deform nickel-based superalloy strip with a thickness of 0.3 mm.

[0030] (Comparative Example 2) A preparation process for a solution-strengthened difficult-to-deform nickel-based superalloy strip, the process steps include: (1) Preparation of nickel alloy billet: By mass percentage, take carbon: 0.075%, silicon: 0.34%, manganese: 0.47%, chromium: 22%, cobalt: 0.055%, aluminum: 0.35%, molybdenum: 1.305%, iron: 0.265%, tungsten: 13.85%, titanium: 3.50%, and the balance is nickel; then put silicon, manganese, chromium, molybdenum, iron, cobalt, tungsten, and nickel into a vacuum induction melting furnace with a vacuum degree of 0.4 Pa and a temperature of 1580 °C to be completely melted and then refined for 30 min. After refining, a deoxidizer is added for deoxidation. After deoxidation, under argon protection, carbon, aluminum, and titanium are added, stirred for 5 min, and then cast out at a casting temperature of 1500 °C, solidified, homogenized at 1180 °C for 48 h, and air-cooled to room temperature to obtain a nickel alloy billet; among them, the deoxidizer includes coke and nickel-magnesium alloy, and the mass ratio of coke to nickel-magnesium alloy is 100:350; among them, the addition amount of coke is 40% of the mass of carbon element in the composition of the solution-strengthened difficult-to-deform nickel-based superalloy strip; (2) The nickel alloy billet obtained in step (1) is subjected to cogging forging at 900 °C to obtain a nickel alloy sheet, among which the deformation amount of each cogging forging pass is 30%, and the final total deformation amount is 80%; (3) The surface oxide scale of the nickel alloy sheet obtained in step (2) is removed, the turning depth is 0.7 nm, and then the roll is heated to 750 °C and hot rolled under electric pulse conditions. The deformation amount of each pass is 35%, and the final total deformation amount is 82%. The roll speed is set at 42.5 mm / s to obtain a 3-mm-thick nickel-based alloy strip; among them, the electric pulse voltage is 24 V, the pulse width is 100 μs, and the frequency is 500 Hz; (4) The nickel-based alloy strip obtained in step (3) is solution-treated at 1200 °C for 50 min, then air-cooled to room temperature, surface pickled, and then the strip blank is rolled in multiple passes using a four-high reversible cold rolling mill. Among them, the deformation rate of the first cold rolling is controlled at 17%, the intermediate cold rolling deformation rate of each subsequent pass is controlled at 30%, and the final cold rolling deformation rate is controlled at 25%; between every two passes of cold rolling, continuous heat treatment annealing is carried out using a protective atmosphere nitrogen continuous heat treatment furnace, the annealing temperature is 1200 °C, the moving speed is 1 m / min, and then the finished product obtained by cold rolling annealing is subjected to finished product heat treatment using a pure hydrogen protective atmosphere continuous heat treatment furnace, the annealing temperature is 965 °C, the moving speed is 2.0 m / min, to obtain a solution-strengthened difficult-to-deform nickel-based superalloy strip with a thickness of 0.3 mm.

[0031] (Comparative Example 3) A preparation process for a solution-strengthened difficult-to-deform nickel-based superalloy strip, the process steps include: (1) Preparation of nickel alloy billet: By mass percentage, take carbon: 0.075%, silicon: 0.34%, manganese: 0.47%, chromium: 22%, cobalt: 0.055%, aluminum: 0.35%, molybdenum: 1.305%, iron: 0.265%, tungsten: 13.85%, titanium: 3.50%, and the balance is nickel; then put silicon, manganese, chromium, molybdenum, iron, cobalt, tungsten, and nickel into a vacuum induction melting furnace with a vacuum degree of 0.4 Pa and a temperature of 1580 °C to be completely melted, then refined for 30 min, after refining, a deoxidizer is added for deoxidation, and after deoxidation, under the conditions of argon protection and laser irradiation, carbon, aluminum, and titanium are added, stirred for 5 min, and then cast out at a casting temperature of 1500 °C, solidified, homogenized at 1180 °C for 48 h, and air-cooled to room temperature to obtain a nickel alloy billet; among them, the single-pulse energy of the laser radiation is 15 μJ, the frequency is 2 MHz, the scanning pitch is 30 μm, and the scanning speed is 4000 mm / s; among them, the deoxidizer includes coke and nickel-magnesium alloy, and the mass ratio of coke to nickel-magnesium alloy is 100:350; among them, the addition amount of coke is 40% of the mass of the carbon element in the composition of the solution-strengthened difficult-to-deform nickel-based superalloy strip; (2) The nickel alloy billet obtained in step (1) is subjected to cogging forging at 900 °C to obtain a nickel alloy plate, among which, the deformation amount of each pass of cogging forging is 30%, and the final total deformation amount is 80%; (3) The surface oxide scale of the nickel alloy plate obtained in step (2) is removed by turning with a turning depth of 0.7 nm, then the rolling rolls are heated to 750 °C for hot rolling, the deformation amount of each pass is 35%, the final total deformation amount is 82%, and the roll speed is set at 42.5 mm / s to obtain a nickel-based alloy strip; (4) The nickel-based alloy strip after step (3) is solution-treated at 1200 °C for 50 min, then air-cooled to room temperature, surface pickled, and then the strip blank is rolled in multiple passes using a four-high reversible cold rolling mill. Among them, the deformation rate of the first cold rolling is controlled at 17%, the intermediate cold rolling deformation rate of each subsequent pass is controlled at 30%, and the final cold rolling deformation rate is controlled at 25%; between every two passes of cold rolling, continuous heat treatment annealing is carried out using a protective atmosphere nitrogen continuous heat treatment furnace, the annealing temperature is 1200 °C, the moving speed is 1 m / min, and then the finished product obtained by cold rolling annealing is subjected to finished product heat treatment using a pure hydrogen protective atmosphere continuous heat treatment furnace, the annealing temperature is 965 °C, and the moving speed is 2.0 m / min, to obtain a solution-strengthened and difficult-to-deform nickel-based superalloy strip with a thickness of 0.3 mm.

[0032] (Effect example) Tensile strength, tensile strength at high temperature: The solution-strengthened and difficult-to-deform nickel-based superalloy strips prepared in the examples and comparative examples were 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".

[0033] The following Table 1 shows the performance test results of the solution-strengthened and difficult-to-deform nickel-based superalloy strips prepared in the examples and comparative examples: Table 1

[0034] As can be seen from the above, the tensile strength and tensile strength at high temperature of the solution-strengthened and difficult-to-deform nickel-based superalloy strips in Examples 1 to 3 are good.

[0035] The difference between Comparative Example 1 and Example 2 is only that the solution-strengthened and difficult-to-deform nickel-based superalloy strip in Comparative Example 1 does not contain titanium element, and the tensile strength and tensile strength at high temperature of the solution-strengthened and difficult-to-deform nickel-based superalloy strip in Comparative Example 1 are weaker than those in Example 2.

[0036] The difference between Comparative Example 2 and Example 2 is only that the solution-strengthened and difficult-to-deform nickel-based superalloy strip in Comparative Example 2 is not subjected to laser irradiation during the stirring and melting process of carbon, aluminum, and titanium, and the tensile strength and tensile strength at high temperature of the solution-strengthened and difficult-to-deform nickel-based superalloy strip in Comparative Example 2 are weaker than those in Example 2.

[0037] The difference between Comparative Example 3 and Example 2 is only that the solution-strengthened and difficult-to-deform nickel-based superalloy strip in Comparative Example 3 is directly hot-rolled during the preparation process, rather than hot-rolled under electric pulse conditions, and the tensile strength and tensile strength at high temperature of the solution-strengthened and difficult-to-deform nickel-based superalloy strip in Comparative Example 3 are weaker than those in Example 2.

[0038] In summary, as can be seen from the above table, the tensile strength of the solution-strengthened difficult-to-deform nickel-based superalloy strip prepared by the present invention and the tensile strength at high temperature are good, which is enhanced by the synergistic effect of the addition of component titanium, the process of stirring and melting carbon, aluminum and titanium under laser irradiation conditions, and hot rolling at high temperature under electric pulse conditions.

[0039] The specific embodiments described above have further elaborated on the purpose, technical solution and beneficial effects of the present invention. It should be understood that the above description is only the specific embodiments of the present invention and is 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 within the protection scope of the present invention.

Claims

1. A solution-strengthened refractory nickel-based superalloy strip, characterized in that, The components by mass fraction include: carbon: 0.07 - 0.08%, silicon: 0.33 - 0.35%, manganese: 0.46 - 0.48%, chromium: 21.7 - 22.3%, cobalt: 0.05 - 0.06%, aluminum: 0.34 - 0.36%, molybdenum: 1.30 - 1.31%, iron: 0.26 - 0.27%, tungsten: 13.85 - 13.86%, titanium: 3.23 - 4.40%, and the balance is nickel.

2. The solution-strengthened difficult-to-deform nickel-based superalloy strip according to claim 1, wherein The solution-strengthened difficult-to-deform nickel-based superalloy strip is first melted with silicon, manganese, chromium, molybdenum, iron, cobalt, tungsten, and nickel in a vacuum induction melting furnace and then refined and deoxidized; after deoxidation, under the conditions of argon protection and laser irradiation, carbon, aluminum, and titanium are added, stirred, and then taken out of the furnace for casting, solidification, and homogenization treatment; then it is subjected to cogging forging, followed by hot rolling under electric pulse conditions, and then successively subjected to solution heat treatment, pickling, cold rolling annealing, and finish heat treatment to obtain the solution-strengthened difficult-to-deform nickel-based superalloy strip.

3. A preparation process for a solution-strengthened refractory nickel-based superalloy strip as described in any one of claims 1 to 2, characterized in that, The technological steps include: (1) Preparation of nickel alloy billet: Take carbon: 0.07 - 0.08%, silicon: 0.33 - 0.35%, manganese: 0.46 - 0.48%, chromium: 21.7 - 22.3%, cobalt: 0.05 - 0.06%, aluminum: 0.34 - 0.36%, molybdenum: 1.30 - 1.31%, iron: 0.26 - 0.27%, tungsten: 13.85 - 13.86%, titanium: 3.23 - 4.40%, and the balance is nickel by mass percentage; then put silicon, manganese, chromium, molybdenum, iron, cobalt, tungsten, and nickel into a vacuum induction melting furnace to be completely melted and then refined for 20 - 40 min. After refining, a deoxidizer is added for deoxidation. After deoxidation, under the conditions of argon protection and laser irradiation, carbon, aluminum, and titanium are added, stirred for 4 - 6 min, then taken out of the furnace for casting, solidification, homogenization treatment, and air-cooled to room temperature to obtain the nickel alloy billet; (2) The nickel alloy billet obtained in step (1) is subjected to cogging forging at 1120 - 1160 °C to obtain a nickel alloy plate, where the deformation per pass of cogging forging is not less than 30%, and the final total deformation is not less than 70%; (3) The surface oxide scale of the nickel alloy plate obtained in step (2) is removed by turning with a depth of 0.5 - 0.8 nm. Subsequently, the rolling rolls are heated to 1120 - 1160 °C and hot rolled under electric pulse conditions with a deformation per pass of not less than 35% and a final total deformation of not less than 80%, and the roll speed is set at 42.5 mm / s to obtain a nickel-based alloy strip; (4) The nickel-based alloy strip obtained in step (3) is successively subjected to the first solution heat treatment, pickling, cold rolling annealing, and finish heat treatment to obtain the solution-strengthened difficult-to-deform nickel-based superalloy strip.

4. The preparation process of the solution-strengthened difficult-to-deform nickel-based superalloy strip according to claim 3, characterized in that, The vacuum degree of the vacuum induction melting furnace is 0.3 - 0.5 Pa.

5. The preparation process of the solution-strengthened refractory nickel-based superalloy strip according to claim 3, characterized in that, The deoxidizer includes coke and nickel-magnesium alloy, and the mass ratio of coke to nickel-magnesium alloy is 80 - 120:300 - 400; among them, the addition amount of coke is 30 - 50% of the mass of carbon element in the composition of the solution-strengthened difficult-to-deform nickel-based superalloy strip.

6. The preparation process of the solution-strengthened difficult-to-deform nickel-based superalloy strip according to claim 3, characterized in that, The single-pulse energy of the laser radiation is 10~20 μJ, the frequency is 0.5~2.5 MHz, the scanning pitch is 10~50 μm, and the scanning speed is 1000~5000 mm / s; the casting temperature is 1400~1600 °C; the homogenization treatment temperature is 1050~1110 °C, and the homogenization treatment time is 24~72 h.

7. The preparation process of the solution-strengthened difficult-to-deform nickel-based superalloy strip according to claim 3, characterized in that, The electric pulse voltage is 24 V, the pulse width is 100 μs, and the frequency is 500 Hz.

8. The preparation process of the solution-strengthened difficult-to-deform nickel-based superalloy strip according to claim 3, characterized in that, The temperature of the vacuum solution treatment is 1150~1250 °C, and the solution treatment time is 40~60 min.

9. The preparation process of the solution-strengthened difficult-to-deform nickel-based superalloy strip according to claim 3, characterized in that, The cold rolling annealing steps are as follows: The strip blank is rolled in multiple passes using a four-high reversible cold rolling mill. Among them, the first cold rolling deformation rate is controlled at about 17%, the intermediate cold rolling deformation rate of each subsequent pass is controlled at 20~43%, and the final cold rolling controlled deformation rate is controlled at about 25%; between every two passes of cold rolling, continuous heat treatment furnace annealing is carried out using a protective atmosphere, the annealing temperature is 1150~1250 °C, and the moving speed is 0.5~1.5 m / min.

10. The preparation process of the solution-strengthened refractory nickel-based superalloy strip according to claim 3, characterized in that, The finished product heat treatment uses a continuous heat treatment furnace with a pure hydrogen protective atmosphere, the annealing temperature is 950~980 °C, and the moving speed is 2.0 m / min.

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