Preparation process of 3J78 precision alloy strip

Abstract

The invention provides a preparation process of a 3J78 precision alloy strip, which comprises the following specific process flows: smelting, forging, hot rolling, solid solution heat treatment, repeated cold rolling annealing and finished product heat treatment, wherein the vacuum induction smelting temperature is 1450-1500 DEG C; the forging and hot rolling temperature is 1100-1150 DEG C, the total deformation amount is 35-70%, and the deformation amount per heating number is 15-35%. The solution treatment temperature is 1100-1200 DEG C, and the heat preservation time is 20-40 minutes. In the intermediate annealing process between every two passes of cold rolling of the strip, the protective atmosphere is ammonia decomposition. The method has the advantages that the cleanliness of the raw materials is guaranteed by selecting a reasonable smelting mode, a reasonable rolling and heat treatment process is formulated by using a multi-roll cold-rolling mill and a continuous annealing furnace subsequently, the strip structure of each pass is recrystallized, the defects of cracks, pits and the like are avoided, the deformation resistance of the alloy is effectively controlled, and the service life of the alloy is prolonged. Therefore, the strip structure is uniform and stable, the batch stability is good, the process is simple, and the operability is good.

Description

Technical Field

[0001] The invention relates to the field of strip preparation technology, and in particular to a 3J78 ​​precision alloy strip preparation technology. Background Art

[0002] 3J78 alloy is a kind of precision alloy material with nickel as the matrix and combined with tungsten, chromium, cobalt, titanium, aluminum and other elements for composite reinforcement. It has been widely used at home and abroad because of its excellent mechanical properties and process performance. Its products include strips, wires, bars, etc., which are mainly used for processing various elastic parts such as wave springs.

[0003] For 3J78 ​​precision alloy strip, there are several main problems:

[0004] (1) Material processing is difficult

[0005] 3J78 precision alloy strip is difficult to form. There are many elements in the alloy, the processing window is narrow, the plasticity is low, the deformation resistance is large, and it is very easy to crack during the forming process.

[0006] (2) Strip forming process research is not systematic and batch stability is insufficient

[0007] If the strip is to meet the final technical index requirements during the preparation process, it is necessary to control the raw materials, equipment capabilities, process parameters and other aspects. The δ0.35mm×240mm 3J78 ​​precision alloy strip provided by the present invention has never been produced before. The reasonable selection of equipment parameters, the optimal design of size and materials, the deformation of the strip in different passes, the frequency of intermediate annealing, the belt speed during heat treatment, and the matching between them all require in-depth and systematic research. For example: If the deformation of the 3J78 ​​precision alloy strip is too large during rolling, it will quickly cause a huge deformation resistance, causing the strip to crack after hardening, and then causing the product to be scrapped. In addition, there are high requirements for the dimensional accuracy and surface quality of the strip for aircraft engines. If the size is out of tolerance or there are metallurgical defects on the surface beyond the requirements of technical standards, the strip will still be unusable. Summary of the invention

[0008] The purpose of the present invention is to solve the problems existing in the background technology, and a preparation process of 3J78 ​​precision alloy strip is provided.

[0009] The invention provides a preparation process of a 3J78 ​​precision alloy strip, and the specific process flow thereof comprises: smelting, forging, hot rolling, solution heat treatment, repeated cold rolling annealing, and finished product heat treatment.

[0010] The vacuum induction melting temperature is 1450℃~1500℃, the electroslag remelting voltage is 35V~45V, and the current is 4500A~5500A; the forging and hot rolling temperature is 1100℃~1150℃, the total deformation is 35%~70%, and the deformation per fire is 15~35%.

[0011] The solution treatment temperature is 1100°C to 1200°C, and the insulation time is 20 to 40 minutes.

[0012] Cold rolling was performed at room temperature.

[0013] During the intermediate annealing process between each cold rolling of the strip, the protective atmosphere is ammonia decomposition, the annealing temperature is 1100℃~1200℃, and the strip speed is controlled at 2.0~2.5m / min.

[0014] The rolling from the strip to the strip includes 6 passes. The first rolling pass uses a large deformation amount, which is 58%, and the subsequent rolling deformation amounts of the second to sixth passes are controlled at 18% to 24%.

[0015] After the finished product is finished, solution heat treatment is carried out, the protective atmosphere is ammonia decomposition, the treatment temperature is 1100℃~1200℃, and the belt speed is 2.0~2.5m / min.

[0016] Compared with the prior art, the present invention has the following advantages:

[0017] The preparation process of the 3J78 ​​precision alloy strip described in the present invention selects a reasonable smelting method to ensure the cleanliness of the raw materials, and subsequently uses a multi-roll cold rolling mill and a continuous annealing furnace to formulate a reasonable rolling and heat treatment process, so that the strip structure is recrystallized in each pass, and no defects such as cracks and pits are generated, the deformation resistance of the alloy is effectively controlled, the strip structure is uniform and stable, and has good batch stability, simple process and good operability. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments:

[0019] Figure 1 This is the finished strip organization diagram of Example 1;

[0020] Figure 2 This is the finished strip organization diagram of Example 2;

[0021] Figure 3 This is the organizational diagram of the finished strip of Example 3. DETAILED DESCRIPTION

[0022] The present invention will be further explained below in conjunction with specific implementation plans, but the present invention is not limited thereto. The structures, proportions, sizes, etc. illustrated in the drawings of the specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the restrictive conditions under which the present invention can be implemented. Therefore, they have no substantive technical significance. Any structural modification, change in proportional relationship or adjustment of size should still fall within the scope of the technical content disclosed by the present invention without affecting the effects and purposes that can be achieved by the present invention.

[0023] Example 1

[0024] After vacuum induction melting and electroslag remelting, the 3J78 ​​alloy ingot is forged into a 20mm thick slab at 1100℃, with a deformation of about 70%, and then hot rolled into a 3mm strip at 1100℃, and then subjected to 1100℃×30 minutes solid solution heat treatment, and then the strip is cold rolled (intermediate annealing is performed between each cold rolling pass), and finally rolled into a 3J78 ​​strip with a specification of δ0.35mm×240mm. The finished product structure is shown in Figure 1 , rolling process parameters are shown in Table 1.

[0025] Table 1 Rolling process parameters of Example 1

[0026]

[0027] Example 2

[0028] After vacuum induction melting and electroslag remelting, the 3J78 ​​alloy ingot is forged into a 20mm thick slab at 1150℃, with a deformation of about 70%, and then hot rolled into a 3mm strip at 1150℃, and then subjected to a solid solution heat treatment at 1150℃×30 minutes, and then the strip is cold rolled (intermediate annealing is performed between each cold rolling pass), and finally rolled into a 3J78 ​​strip with a specification of δ0.35mm×240mm. The finished product structure is shown in Figure 2 , rolling process parameters are shown in Table 2.

[0029] Table 2 Rolling process parameters of Example 2

[0030]

[0031] Example 3

[0032] After vacuum induction melting and electroslag remelting, the 3J78 ​​alloy ingot is forged into a 20mm thick slab at 1150℃, with a deformation of about 70%, and then hot rolled into a 3mm strip at 1150℃, and then subjected to 1200℃×30 minutes solid solution heat treatment, and then the strip is cold rolled (intermediate annealing is performed between each cold rolling pass), and finally rolled into a 3J78 ​​strip with a specification of δ0.35mm×240mm. The finished product structure is shown in Figure 3, rolling process parameters are shown in Table 3.

[0033] Table 3 Rolling process parameters of Example 3

[0034]

[0035] Matters not covered by the present invention are known technologies.

[0036] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A process for preparing 3J78 ​​precision alloy strip, characterized in that: The process flow is: vacuum induction melting, forging, hot rolling, solution heat treatment, repeated cold rolling annealing, and finished product heat treatment.

2. The preparation process of 3J78 ​​precision alloy strip according to claim 1, characterized in that: The vacuum induction melting temperature is 1450℃~1500℃, the electroslag remelting voltage is 35V~45V, and the current is 4500A~5500A; the forging and hot rolling temperatures are 1100℃~1150℃, the total deformation is 35%~70%, and the deformation per fire is 15~35%.

3. The preparation process of 3J78 ​​precision alloy strip according to claim 1, characterized in that: The solution heat treatment temperature is 1100° C. to 1200° C., and the heat preservation time is 20 to 40 minutes.

4. The preparation process of 3J78 ​​precision alloy strip according to claim 1, characterized in that: Cold rolling is carried out at room temperature. In the intermediate annealing process between each cold rolling of the strip, the protective atmosphere is ammonia decomposition, the annealing temperature is 1100℃~1200℃, and the strip speed is controlled at 2.0~2.5m / min.

5. The preparation process of 3J78 ​​precision alloy strip according to claim 1, characterized in that: The rolling from the strip to the strip includes 6 passes in total. The first rolling pass uses a large deformation amount, which is 58%. The subsequent rolling deformation amounts of the second to sixth rolling passes are controlled at 18% to 24%.

6. The process for preparing the 3J78 ​​precision alloy strip according to claim 1, characterized in that: After the finished product is finished, solution heat treatment is carried out, the protective atmosphere is ammonia decomposition, the treatment temperature is 1100℃~1200℃, and the belt speed is 2.0~2.5m / min.

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