An optimized annealing process for n07718 high temperature alloy foil strip

Abstract

The application discloses an optimized annealing process of N07718 high-temperature alloy foil strip, which comprises the following steps: S1, unwinding, the strip is loaded into an unwinder, the strip is made flat by a straightening roller to enter an annealing furnace; S2, protective gas is filled into the annealing furnace; S3, a gradient temperature rise is carried out on a preheating zone of the annealing furnace, and the temperature of the preheating zone is 300 DEG C-500 DEG C; S4, a heating zone of the annealing furnace is kept warm, the temperature of the heating zone is 1040 DEG C-1060 DEG C, and the strip passes through the heating zone at a speed of 5 m / min-7 m / min; and S5, a fan is used to rapidly cool the strip after annealing. Compared with the prior art, the application can solve the problem of low intermediate heat treatment efficiency of the existing N07718 high-temperature alloy, and the problem of affecting production efficiency is solved.

Description

Technical Field

[0001] This invention belongs to the field of alloy material processing technology, and in particular relates to an optimized annealing process for N07718 high-temperature alloy foil strip. Background Technology

[0002] In foil production, due to the need for multi-pass rolling, post-cold rolling heat treatment is a common process to restore the material's plasticity for continued production. N07718 is a common high-temperature alloy, and the standard requires a solution heat treatment temperature of 941~996℃. In the production of 0.2mm thick N07718 foil, due to the material's high strength, intermediate heat treatment is particularly necessary to fully restore its plasticity. However, temperature limitations result in low intermediate heat treatment capacity. This process aims to optimize the intermediate heat treatment process to facilitate production and subsequent rolling. Summary of the Invention

[0003] The purpose of this invention is to provide an optimized annealing process for N07718 high-temperature alloy foil strips in order to solve the problem of low intermediate heat treatment efficiency of existing N07718 high-temperature alloys, which affects production efficiency.

[0004] To achieve the above objectives, the present invention provides an optimized annealing process for N07718 high-temperature alloy foil strip, comprising the following steps:

[0005] S1. Uncoiling: The strip is loaded into the uncoiling machine, and the straightening rollers eliminate the bending of the strip, so that the strip is flat and enters the annealing furnace.

[0006] S2. A protective gas is introduced into the annealing furnace;

[0007] S3. Gradual heating is performed on the preheating zone of the annealing furnace, and the temperature of the preheating zone is 300℃-500℃;

[0008] S4. The heating zone of the annealing furnace is kept at a temperature of 1040℃-1060℃, and the strip passes through the heating zone at a speed of 5m / min-7m / min.

[0009] S5. Use a fan to rapidly cool the annealed strip.

[0010] As a further description of the above technical solution:

[0011] The temperature of the heating zone is 1050℃.

[0012] As a further description of the above technical solution:

[0013] The strip passes through the heating zone at a speed of 6 m / min.

[0014] As a further description of the above technical solution:

[0015] The thickness of the strip is 0.2 mm.

[0016] As a further description of the above technical solution:

[0017] The protective gas is nitrogen, argon, or an argon-hydrogen mixture.

[0018] As a further description of the above technical solution:

[0019] The hydrogen content in the argon-hydrogen mixture is no higher than 3%.

[0020] As a further description of the above technical solution:

[0021] The fan is a dual-frequency fan.

[0022] In summary, due to the adoption of the above technical solution, the beneficial effects of this invention are as follows: In this invention, annealing is performed at a temperature of 1050℃, an annealing speed of 6m / min, and rapid cooling is achieved using a 35Hz + 30Hz fan. The resulting strip exhibits the following tensile properties: tensile strength: 946MPa, yield strength: 457MPa, and elongation: 48.5%. These properties meet the requirements of slow annealing at 990℃, satisfying the needs of subsequent rolling. The annealing speed is increased by 50%, thus optimizing the heat treatment process and improving production efficiency. Attached Figure Description

[0023] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a grain structure diagram of the strip prepared according to the present invention. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0026] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0027] Implementation 1:

[0028] Please see Figure 1 This invention provides an optimized annealing process for N07718 high-temperature alloy foil strip, comprising the following steps:

[0029] S1. Uncoiling: The strip is loaded into the uncoiling machine, and the straightening rollers eliminate the bending of the strip, so that the strip is flat and enters the annealing furnace.

[0030] S2. A protective gas is introduced into the annealing furnace;

[0031] S3. Gradual heating is performed on the preheating zone of the annealing furnace, and the temperature of the preheating zone is 300℃-500℃;

[0032] S4. The heating zone of the annealing furnace is kept at a temperature of 1040℃-1060℃, and the strip passes through the heating zone at a speed of 5m / min-7m / min.

[0033] S5. Use a fan to rapidly cool the annealed strip.

[0034] Specifically, the temperature of the heating zone is 1050°C.

[0035] Specifically, the strip passes through the heating zone at a speed of 6 m / min.

[0036] Specifically, the thickness of the strip is 0.2 mm.

[0037] Specifically, the protective gas is nitrogen, argon, or an argon-hydrogen mixture.

[0038] The hydrogen content in the argon-hydrogen mixture is no higher than 3%. Hydrogen can optimize the microstructure of nickel-based alloys, thereby effectively reducing their work hardening.

[0039] The fan is a dual-frequency fan. Specifically, the dual-frequency fan can switch between operating at 35Hz and 30Hz to achieve energy saving.

[0040] The tensile properties of the strip were tested and found to be: tensile strength: 946 MPa, yield strength: 457 MPa, and elongation: 48.5%.

[0041] Example 2:

[0042] S1. Uncoiling: The strip is loaded into the uncoiling machine, and the straightening rollers eliminate the bending of the strip, so that the strip is flat and enters the annealing furnace.

[0043] S2. A protective gas is introduced into the annealing furnace;

[0044] S3. Gradual heating is performed on the preheating zone of the annealing furnace, and the temperature of the preheating zone is 300℃-500℃;

[0045] S4. The heating zone of the annealing furnace is kept at a temperature of 990°C, and the strip passes through the heating zone at a speed of 3m / min.

[0046] S5. Use a fan to rapidly cool the annealed strip.

[0047] The tensile properties of the strip were tested and found to be: tensile strength: 934 MPa, yield strength: 490 MPa, elongation: 43.2%, and grain size: 10.5 grade.

[0048] Example 3:

[0049] S1. Uncoiling: The strip is loaded into the uncoiling machine, and the straightening rollers eliminate the bending of the strip, so that the strip is flat and enters the annealing furnace.

[0050] S2. A protective gas is introduced into the annealing furnace;

[0051] S3. Gradual heating is performed on the preheating zone of the annealing furnace, and the temperature of the preheating zone is 300℃-500℃;

[0052] S4. The heating zone of the annealing furnace is kept at a temperature of 1050°C, and the strip passes through the heating zone at a speed of 3m / min.

[0053] S5. Use a fan to rapidly cool the annealed strip.

[0054] The tensile properties of the strip were tested as follows: tensile strength: 875 MPa, yield strength: 432 MPa, elongation: 48.3%, and grain size: 9.5. The tensile strength decreased by 6%, the yield strength decreased by 11.8%, and the elongation increased by 11.8%, making it more suitable for rolling. The microstructure showed no precipitates and no abnormal grain growth.

[0055] In summary, due to the adoption of the above technical solution, the beneficial effects of this invention are as follows: In this invention, annealing is performed at a temperature of 1050℃, an annealing speed of 6m / min, and rapid cooling is achieved using a 35Hz + 30Hz fan. The resulting strip exhibits the following tensile properties: tensile strength: 946MPa, yield strength: 457MPa, and elongation: 48.5%. These properties meet the requirements of slow annealing at 990℃, satisfying the needs of subsequent rolling. The annealing speed is increased by 50%, thus optimizing the heat treatment process and improving production efficiency.

[0056] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. An optimized annealing process for N07718 high-temperature alloy foil strip, characterized in that, Includes the following steps: S1. Uncoiling: The strip is loaded into the uncoiling machine, and the straightening rollers eliminate the bending of the strip, so that the strip is flat and enters the annealing furnace. S2. A protective gas is introduced into the annealing furnace; S3. Gradual heating is performed on the preheating zone of the annealing furnace, and the temperature of the preheating zone is 300℃-500℃; S4. The heating zone of the annealing furnace is kept at a temperature of 1040℃-1060℃, and the strip passes through the heating zone at a speed of 5m / min-7m / min. S5. Use a fan to rapidly cool the annealed strip.

2. The optimized annealing process for N07718 high-temperature alloy foil strip according to claim 1, characterized in that, The temperature of the heating zone is 1050℃.

3. The optimized annealing process for N07718 high-temperature alloy foil strip according to claim 1, characterized in that, The strip passes through the heating zone at a speed of 6 m / min.

4. The optimized annealing process for N07718 high-temperature alloy foil strip according to claim 1, characterized in that, The thickness of the strip is 0.2 mm.

5. The optimized annealing process for N07718 high-temperature alloy foil strip according to claim 1, characterized in that, The protective gas is nitrogen, argon, or an argon-hydrogen mixture.

6. The optimized annealing process for N07718 high-temperature alloy foil strip according to claim 5, characterized in that, The hydrogen content in the argon-hydrogen mixture is no higher than 3%.

7. The optimized annealing process for N07718 high-temperature alloy foil strip according to claim 1, characterized in that, The fan is a dual-frequency fan.

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