Preparation method of scandium-containing aluminum magnesium alloy wire

Abstract

The invention discloses a preparation method of a scandium-containing aluminum-magnesium alloy wire, and relates to the field of manufacturing methods of scandium-containing aluminum-magnesium alloy wires for fasteners. The invention aims at solving the technical maturity of manufacturing scandium-containing aluminum alloy wires and improving the production efficiency of fastener products at the same time. The method comprises the following steps: carrying out extrusion production on a scandium-containing aluminum-magnesium alloy uniform fire ingot blank; carrying out hot rolling production on the extrusion rod; intermediate annealing; carrying out drawing production; and detecting the performance. The prepared scandium-containing aluminum-magnesium alloy wire meets the design material selection requirements of fasteners for aerospace, and popularization and application of the scandium-containing aluminum-magnesium alloy wire are better facilitated. The scandium-containing aluminum-magnesium alloy wire prepared by the method is used for aerospace fasteners.

Description

Technical Field

[0001] The invention relates to the field of a method for manufacturing a scandium-containing aluminum-magnesium alloy wire for fasteners. Background Art

[0002] Aluminum-magnesium alloy has the characteristics of high strength, light weight, small elastic modulus and good heat dissipation, but it is difficult to process. Scandium belongs to transition metals and rare earth elements. It is light, soft, has a high melting point and active chemical properties. The aluminum-magnesium-scandium alloy obtained by adding scandium as a trace element to aluminum-magnesium alloy can reduce the grain size, increase the recrystallization temperature, further improve the strength, improve the welding performance, and has the advantages of high temperature resistance and corrosion resistance.

[0003] With the demand for high strength, corrosion resistance, and high temperature resistance of fastener wires in aerospace, people are gradually focusing on applying scandium-containing aluminum alloy wires to fastener products. However, at present, scandium-containing aluminum alloy wires are mainly welding wire products at home and abroad, and there are few reports on fastener wires, and their preparation methods are still in the exploratory stage. Summary of the invention

[0004] The present invention provides a method for preparing a scandium-containing aluminum-magnesium alloy wire in order to solve the technical maturity of manufacturing scandium-containing aluminum alloy wires, provide new wire products for improving the material selection of fastener products, broaden the application fields of fastener products and improve the market competitiveness.

[0005] A method for preparing a scandium-containing aluminum-magnesium alloy wire is specifically carried out according to the following steps:

[0006] 1. homogenizing the scandium-containing aluminum-magnesium alloy ingot, sawing it, and lathing it to obtain a scandium-containing aluminum-magnesium alloy homogenizing ingot;

[0007] 2. Extruding the scandium-containing aluminum-magnesium alloy tempered ingot obtained in step 1 to obtain an extruded rod;

[0008] 3. hot-rolling the extruded rod obtained in step 2 to obtain a hot-rolled coil;

[0009] Fourth, the hot-rolled coil obtained in step three is subjected to intermediate annealing treatment, and then subjected to multiple cold-drawing production, sampling, and testing to obtain the scandium-containing aluminum-magnesium alloy wire.

[0010] Furthermore, the homogenization process in step 1 is as follows: heating the scandium-containing aluminum-magnesium alloy ingot to a temperature of 350-480° C., keeping the temperature for 5-10 hours, and then taking it out of the furnace and air cooling it.

[0011] Furthermore, the extrusion production temperature in step 2 is 380-460° C., and the extrusion speed is controlled to be ≤1.3 mm / s.

[0012] Furthermore, the hot rolling temperature in step 3 is 450-510°C.

[0013] Furthermore, the annealing process described in step 4 is: keeping the temperature at 430-510°C for 4 hours, then cooling to a temperature ≤ 200°C, and then air cooling out of the furnace.

[0014] Furthermore, in step 4, the cold drawing production controls the drawing deformation rate to be 20% to 60%.

[0015] Furthermore, in the cold drawing process of step 4, the last drawing deformation controls the wire properties, and the penultimate drawing deformation controls the grain size of the wire.

[0016] The present invention adopts the method of extrusion + hot rolling, combined with wire drawing production with a certain deformation processing rate, to replace traditional small coil weight and small coil diameter wire with large coil weight and large coil diameter wire, so that its comprehensive performance meets the aerospace requirements for fastener wire.

[0017] The key points of the present invention are: (1) adopting a new production process of scandium-containing aluminum-magnesium alloy wire, changing from extrusion + drawing to extrusion + hot rolling + drawing to solve the problems of poor forming and uniform structure caused by direct hot rolling, and obtaining scandium-containing aluminum-magnesium alloy wire with qualified structure and performance; (2) formulating a suitable hot rolling process to reduce the deformation resistance during the rolling process, thereby solving the hot rolling cracking problem and improving the hot rolling formability of the scandium-containing aluminum-magnesium alloy; (3) matching a suitable cold drawing deformation processing rate, which can not only improve the performance of the wire, but also control the grain size of the wire, thereby meeting the rivet upsetting requirements of the wire.

[0018] The beneficial effects of the present invention are:

[0019] The scandium-containing aluminum-magnesium alloy wire prepared by the present invention not only meets the design and material selection requirements of aerospace fasteners, but will also be more conducive to the promotion and use of scandium-containing aluminum-magnesium alloy wires. The scandium-containing aluminum-magnesium alloy wire prepared by the present invention can achieve high strength, corrosion resistance, and high temperature resistance while ensuring that various properties meet the requirements, and can also achieve uniformity and stability of wire structure performance, and can also broaden the application market of scandium-containing aluminum-magnesium alloy wires and improve the market competitiveness of domestic fastener wires.

[0020] The scandium-containing aluminum-magnesium alloy wire prepared by the invention is used for various types of rivet products for fasteners. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a photo of the scandium-containing aluminum-magnesium alloy wire prepared in Example 1;

[0022] Figure 2 This is the metallographic structure diagram of the scandium-containing aluminum-magnesium alloy wire prepared in Example 1. DETAILED DESCRIPTION

[0023] Specific implementation method 1: This implementation method is a method for preparing a scandium-containing aluminum-magnesium alloy wire, which is specifically carried out according to the following steps:

[0024] 1. homogenizing the scandium-containing aluminum-magnesium alloy ingot, sawing it, and lathing it to obtain a scandium-containing aluminum-magnesium alloy homogenizing ingot;

[0025] 2. Extruding the scandium-containing aluminum-magnesium alloy tempered ingot obtained in step 1 to obtain an extruded rod;

[0026] 3. hot-rolling the extruded rod obtained in step 2 to obtain a hot-rolled coil;

[0027] Fourth, the hot-rolled coil obtained in step three is subjected to intermediate annealing treatment, and then subjected to multiple cold-drawing production, sampling, and testing to obtain the scandium-containing aluminum-magnesium alloy wire.

[0028] Specific embodiment 2: This embodiment is different from specific embodiment 1 in that: the homogenization process in step 1 is: heating the scandium-containing aluminum-magnesium alloy ingot to a temperature of 350-480°C, keeping it warm for 5-10 hours, and then taking it out of the furnace and air cooling it. The rest is the same as specific embodiment 1.

[0029] Specific implementation method 3: This implementation method is different from specific implementation method 1 or 2 in that the extrusion production temperature in step 2 is 380-460°C, and the extrusion speed is controlled to be ≤1.3 mm / s. The rest is the same as specific implementation method 1 or 2.

[0030] Specific embodiment 4: This embodiment is different from specific embodiments 1 to 3 in that the extrusion production temperature in step 2 is 390-450° C. The rest is the same as specific embodiments 1 to 3.

[0031] Specific implementation mode 5: This implementation mode is different from specific implementation modes 1 to 4 in that the hot rolling temperature in step 3 is 450-510° C. The rest is the same as specific implementation modes 1 to 4.

[0032] Specific implementation method 6: This implementation method is different from specific implementation methods 1 to 5 in that the hot rolling temperature in step 3 is 470-500° C. The rest is the same as specific implementation methods 1 to 5.

[0033] Specific embodiment 7: This embodiment differs from specific embodiments 1 to 6 in that the annealing process in step 4 is: keeping the temperature at 430-510°C for 4 hours, then cooling to a temperature ≤ 200°C, and then air cooling. The rest is the same as specific embodiments 1 to 6.

[0034] Specific implementation eight: This implementation differs from specific implementations one to seven in that the cold drawing process deformation rate in step four is controlled to be 20% to 60%. The rest is the same as specific implementations one to seven.

[0035] Specific embodiment 9: This embodiment is different from specific embodiments 1 to 8 in that: step 4 performs 3 to 4 cold drawing passes. The rest is the same as specific embodiments 1 to 8.

[0036] Specific embodiment 10: This embodiment differs from specific embodiments 1 to 9 in that: in step 4, during the cold drawing process, the last drawing deformation controls the wire properties, and the penultimate drawing deformation controls the wire grain size. The rest is the same as specific embodiments 1 to 9.

[0037] The content of the present invention is not limited to the content of the above-mentioned embodiments. The combination of one or several specific embodiments can also achieve the purpose of the invention.

[0038] Example:

[0039] The present embodiment provides a method for preparing a φ3.5 mm scandium-containing aluminum-magnesium alloy wire, which is specifically carried out in the following steps:

[0040] 1. The scandium-containing aluminum-magnesium alloy ingot with a specification of φ425mm×5000mm is homogenized, sawed, and turned into a sheet to obtain a scandium-containing aluminum-magnesium alloy homogenized ingot with a specification of φ405mm×1000mm; the homogenization process is: heating the scandium-containing aluminum-magnesium alloy ingot to a temperature of 380°C, keeping it warm for 10 hours, and then taking it out of the furnace and air cooling it;

[0041] 2. Extruding the scandium-containing aluminum-magnesium alloy tempered ingot obtained in step 1 at a temperature of 400° C. and controlling the extrusion speed to be ≤1.3 mm / s to obtain an extruded rod with a specification of φ145 mm×6000 mm;

[0042] 3. hot rolling the extruded rod obtained in step 2 at a temperature of 500° C. to obtain a hot rolled coil with a specification of φ8 mm;

[0043] 4. The hot-rolled coil obtained in step 3 is subjected to intermediate annealing treatment, and the annealing process is as follows: keeping the temperature at 430-510°C for 4 hours, then cooling to a temperature ≤ 200°C, and then air-cooling; then 3-4 cold drawing passes are performed, sampling and testing are performed, and the scandium-containing aluminum-magnesium alloy wire with a specification of φ3.5mm is obtained.

[0044] The photo of the aluminum-magnesium alloy wire containing scandium with a specification of φ3.5 mm described in this embodiment is as follows Figure 1 As shown, the metallographic structure diagram is as follows Figure 2The mechanical properties test results are shown in Table 1.

[0045] Table 1

[0046]

[0047] The scandium-containing aluminum-magnesium alloy wire prepared by the present invention can achieve uniformity and stability of organizational performance, and its comprehensive performance is significantly better than that of the scandium-free aluminum-magnesium alloy wire. At the same time, it can achieve large coil diameter and large coil weight, and can meet the requirements of improving production efficiency and reducing production costs of aerospace fasteners. With the price of aluminum-scandium master alloys falling, it is also conducive to the promotion and use of scandium-containing aluminum-magnesium alloy wires in aerospace fasteners.

Claims

1. A method for preparing a scandium-containing aluminum-magnesium alloy wire, characterized in that The method is specifically carried out in the following steps:

1. homogenizing the scandium-containing aluminum-magnesium alloy ingot, sawing it, and lathing it to obtain a scandium-containing aluminum-magnesium alloy homogenizing ingot; 2. Extruding the scandium-containing aluminum-magnesium alloy tempered ingot obtained in step 1 to obtain an extruded rod; 3. hot-rolling the extruded rod obtained in step 2 to obtain a hot-rolled coil; Fourth, the hot-rolled coil obtained in step three is subjected to intermediate annealing treatment, and then subjected to multiple cold-drawing production, sampling, and testing to obtain the scandium-containing aluminum-magnesium alloy wire.

2. The method for preparing a scandium-containing aluminum-magnesium alloy wire according to claim 1, characterized in that The homogenization process in step 1 is as follows: heating the scandium-containing aluminum-magnesium alloy ingot to a temperature of 350-480° C., keeping the temperature for 5-10 hours, and then taking it out of the furnace and air cooling it.

3. The method for preparing a scandium-containing aluminum-magnesium alloy wire according to claim 1, characterized in that The extrusion production temperature in step 2 is 380-460° C., and the extrusion speed is controlled to be ≤1.3 mm / s.

4. The method for preparing a scandium-containing aluminum-magnesium alloy wire according to claim 3, characterized in that The temperature of the extrusion production in step 2 is 390-450°C.

5. The method for preparing a scandium-containing aluminum-magnesium alloy wire according to claim 1, characterized in that The hot rolling temperature in step 3 is 450-510°C.

6. The method for preparing a scandium-containing aluminum-magnesium alloy wire according to claim 5, characterized in that The hot rolling temperature in step 3 is 470-500°C.

7. The method for preparing a scandium-containing aluminum-magnesium alloy wire according to claim 1, characterized in that The annealing process in step 4 is: keep the temperature at 430-510°C for 4 hours, then cool to a temperature ≤ 200°C, and then take out of the furnace and air cool.

8. The method for preparing a scandium-containing aluminum-magnesium alloy wire according to claim 1, characterized in that In step 4, the cold drawing production controls the drawing deformation rate to be 20% to 60%.

9. The method for preparing a scandium-containing aluminum-magnesium alloy wire according to claim 1, characterized in that Step 4 is to carry out 3 to 4 passes of cold drawing production.

10. The method for preparing a scandium-containing aluminum-magnesium alloy wire according to claim 1, characterized in that Step 4: During the cold drawing process, the deformation in the last drawing pass controls the wire properties, and the deformation in the second to last drawing pass controls the grain size of the wire.

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