CN116219234A - High-strength aluminum alloy section bar for energy storage device and preparation method thereof - Google Patents

Abstract

The invention discloses an energy-storage high-strength aluminum alloy section bar and a preparation method thereof, wherein the aluminum alloy comprises the following chemical components in percentage by weight: 1.0 to 1.05 percent, si:0.70 to 0.75 percent, cu:0.28 to 0.33 percent, mn:0.05 to 0.1 percent, cr:0.08 to 0.13 percent, ti:0.03 to 0.08 percent, fe:0.1 to 0.2 percent, zn:0 to 0.05 percent, zr:0.03 to 0.06 percent, and the balance of Al. According to the invention, the ingredients of the ingredients are improved, a gradient heating process is adopted, namely, the temperature of the heated aluminum rod before extrusion is gradually reduced along the axis direction from front to back, so that a temperature gradient is formed, isothermal extrusion is realized, the metal flow rate is uniform during extrusion, the change of crystal grains is small, the surface color is uniform, the mechanical property deviation is small, a secondary aging process is adopted, the alloy strengthening item is fully desolventized, the tensile strength of the section bar reaches more than 380MPa, the yield strength reaches more than 330MPa, the product quality is greatly improved, and the quality of the integral energy storage device is improved.

Description

High-strength aluminum alloy profile for energy storage device and preparation method thereof

technical field

The invention belongs to the technical field of alloy profile and alloy preparation technology, and in particular relates to an energy storage high-strength aluminum alloy profile and a preparation method thereof.

Background technique

Alloys are substances with metallic properties that are synthesized by two or more metals and metals or nonmetals by a certain method. It is generally obtained by melting into a homogeneous liquid and solidifying. According to the number of constituent elements, it can be divided into binary alloys, ternary alloys and multi-component alloys. Usually, two or more metal elements or other non-metallic elements are added based on metals through alloying processes (smelting, mechanical alloying) Metal materials with metallic properties formed by melting, sintering, vapor deposition, etc.) are called alloys. But alloys may contain only one metallic element, such as steel.

Defects in the prior art:

1. The alloy formed by proportioning in the prior art, due to the deployment of silicon, copper, manganese and chromium content, the parameters in terms of mechanical properties, corrosion resistance, fluidity and mechanical properties are not uniform enough, which affects the use of the alloy. For The amount of zinc and aluminum used may cause shrinkage and affect the overall strength.

2. The existing preparation process uses single temperature heating, no temperature gradient and isothermal extrusion, resulting in the production of alloys with uneven metal flow rate, large grain changes, uneven surface color quality, large deviation in mechanical properties, and single failure process, resulting in poor strength, poor tensile and compressive properties, which have an impact on the quality of energy storage devices.

Description of drawings

The accompanying drawings are used to provide a further understanding of the present invention, and constitute a part of the description, and are used together with the embodiments of the present invention to explain the present invention, and do not constitute a limitation to the present invention.

Fig. 1 is a curve diagram of a tensile test report of an embodiment of the present invention;

Fig. 2 is the graph of report of tensile test of embodiment two of the present invention;

Fig. 3 is a curve diagram of a tensile test report in Example 3 of the present invention.

Detailed ways

The object of the present invention is to provide an energy storage high-strength aluminum alloy profile and a preparation method thereof, so as to solve the problems raised in the above-mentioned background technology.

In order to achieve the above object, the present invention provides the following technical solutions: an energy storage high-strength aluminum alloy profile and its preparation method, the chemical composition of the aluminum alloy is Mg: 1.0-1.05%, Si: 0.70-0.75%, Cu : 0.28～0.33%, Mn: 0.05～0.1%, Cr: 0.08～0.13%, Ti: 0.03～0.08%, Fe: 0.1～0.2%, Zn: 0～0.05%, Zr: 0.03～0.06%, balance for Al.

A method for preparing an energy-storage high-strength aluminum alloy profile, the method comprising the following steps:

Step 1: Melting and casting: Put the prepared raw materials into the melting furnace to melt, and effectively remove the slag inclusions and gases in the melt by means of degassing and slag removal refining, and cast the smelted aluminum liquid into aluminum through the deep well casting system alloy ingot;

Step 2: Homogenization: place the aluminum alloy ingot at 565±5°C for homogenization treatment, and heat for 6-8h;

Step 3: Cooling: cooling with strong water to 80±5°C;

Step 4: Extrusion: send the homogenized aluminum rods into the natural gas aluminum rod heating furnace for heating through a mechanical device. There are four heating areas in the aluminum rod furnace. The first stage is set at 350 °C, and the second stage The setting is 450°C, the third stage is set at 480°C, and the fourth stage is set at 510°C. The ingot is cut into short aluminum rods with a length of 800-1200mm by a hot saw device and then sent into the ingot barrel of the extruder. Extrusion molding, the outlet temperature of the extruded profile is 520-540°C;

Step 5: Stretch: Stretch and straighten the extruded profile according to the deformation amount of 0.8%-1.2%, and eliminate the internal stress;

Step 6: Artificial aging: Cut the stretched profile into a frame and send it to the aging furnace for aging treatment within 8 hours. The aging is divided into two levels. The aging temperature is 160±5°C, heat preservation for 2 hours, and after being out of the furnace, use an axial fan to blow and cool to room temperature to obtain the finished aluminum alloy profile.

Furthermore, the aluminum alloy ingot is heated by hot air, and the gas is fed into the hot air furnace for combustion. After the high temperature flue gas generated by the combustion is mixed with the cold air, it is sent into the silo by the induced draft fan through the pipeline to cool the alloy. For heating, the gas is injected through multiple groups of air supply pipes evenly arranged on the inner wall of the main pipeline, and at a position close to one end of the air supply pipe, it is fed and mixed at a uniform speed by a fan. It is characterized by uniform heating, not easy to sinter, and makes the pressure of each position in the interior uniform and the same to avoid air explosion.

Further, the extruding machine ingot barrel is extruded and extruded by means of spiral propulsion, and the spiral propulsion is multi-spiral roller propulsion.

Beneficial technical effect of the present invention:

The invention discloses a high-strength aluminum alloy profile for an energy storage device and a preparation method thereof. By improving the ingredients and adopting a gradient heating process, the temperature of the aluminum rod that has been heated before extrusion is gradually reduced from the front to the rear along the axis direction, forming a temperature Gradient, to achieve isothermal extrusion, so that the metal flow rate is uniform during extrusion, the grain change is small, the surface color is uniform, and the mechanical property deviation is small. The secondary aging process is adopted to make the alloy strengthening item fully desolvated, and the tensile strength of the profile reaches Above 380MPa, the yield strength reaches above 330MPa, which greatly improves the product quality, thereby improving the quality of the overall energy storage device.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

The present invention provides a technical scheme of a threat information collection and fusion system based on multi-source network space: the chemical composition of the aluminum alloy is Mg: 1.0-1.05%, Si: 0.70-0.75%, Cu: 0.28-0.33%, Mn: 0.05-0.1%, Cr: 0.08-0.13%, Ti: 0.03-0.08%, Fe: 0.1-0.2%, Zn: 0-0.05%, Zr: 0.03-0.06%, and the balance is Al.

A method for preparing an energy-storage high-strength aluminum alloy profile, characterized in that the preparation method includes the following steps:

Step 1: Melting and casting: Put the prepared raw materials into the melting furnace to melt, and effectively remove the slag inclusions and gases in the melt by means of degassing and slag removal refining, and cast the smelted aluminum liquid into aluminum through the deep well casting system alloy ingot;

Step 2: Homogenization: place the aluminum alloy ingot at 565±5°C for homogenization treatment, and heat for 6-8h;

Step 3: Cooling: cooling with strong water to 80±5°C;

Step 4: Extrusion: send the homogenized aluminum rods into the natural gas aluminum rod heating furnace for heating through a mechanical device. There are four heating areas in the aluminum rod furnace. The first stage is set at 350 °C, and the second stage The setting is 450°C, the third stage is set at 480°C, and the fourth stage is set at 510°C. The ingot is cut into short aluminum rods with a length of 800-1200mm by a hot saw device and then sent into the ingot barrel of the extruder. Extrusion molding, the outlet temperature of the extruded profile is 520-540°C;

Step 5: Stretch: Stretch and straighten the extruded profile according to the deformation amount of 0.8%-1.2%, and eliminate the internal stress;

Step 6: Artificial aging: Cut the stretched profile into a frame and send it to the aging furnace for aging treatment within 8 hours. The aging is divided into two levels. The aging temperature is 160±5°C, heat preservation for 2 hours, and after being out of the furnace, use an axial fan to blow and cool to room temperature to obtain the finished aluminum alloy profile.

In this embodiment, the aluminum alloy ingot is heated by hot air, and the gas is fed into the hot air furnace for combustion. After the high-temperature flue gas generated by the combustion is mixed with cold air, it is sent into the silo by the induced draft fan through the pipeline to cool the alloy. For heating, the gas is injected through multiple groups of air supply pipes evenly arranged on the inner wall of the main pipeline, and at a position close to one end of the air supply pipe, it is fed and mixed at a uniform speed by a fan. It is characterized by uniform heating, not easy to sinter, and makes the pressure of each position in the interior uniform and the same to avoid air explosion.

In this embodiment, the ingot holder of the extruder is extruded and extruded by means of spiral push, and the spiral push is pushed by multiple helical rollers.

In this embodiment, the role of the chemical elements of the present invention in the aluminum alloy is as follows: Mg: Magnesium can improve the mechanical properties and machinability of the aluminum alloy, as well as the corrosion resistance, and can form a strengthening item with silicon to improve the mechanical properties. The content of magnesium in the present invention is controlled at 1.0-1.05%. Si: Silicon can make aluminum alloy flow well, improve corrosion resistance, wear resistance and weldability, and can form strengthening items with magnesium to improve mechanical properties. The silicon content of the present invention is controlled at 0.70-0.75%.

Cu: Copper can improve the mechanical properties and machinability of aluminum alloys, but the corrosion resistance and fluidity will deteriorate, causing intergranular corrosion. The copper content of the present invention is controlled at 0.28-0.33%. Mn: manganese element can increase the recrystallization temperature, prevent the recrystallization process of aluminum alloy, refine the grains, and reduce the harmful effects of iron, but its addition amount should be changed according to the content of iron in the alloy, otherwise coarse primary crystals, mechanical Performance drops significantly. The content of manganese in the present invention is controlled at 0.05-0.1%.

Cr: Chromium has a certain strengthening effect on the alloy, hinders the nucleation and growth process of recrystallization, and can also improve the toughness of the alloy and reduce the sensitivity of stress corrosion cracking, offsetting the adverse effects of copper on corrosion resistance. The chromium content of the present invention is controlled at 0.08-0.13%

Ti: Adding a small amount of titanium element can refine the role of aluminum alloy casting structure and weld structure. The content of titanium in the present invention is controlled at 0.03-0.08%.

Fe: A small amount of iron element can reduce the shrinkage cavity of aluminum alloy and refine the crystal material. The iron content of the present invention is controlled at 0.1-0.2%.

Zn: Adding zinc and magnesium together can significantly strengthen the aluminum alloy, but it tends to resist stress and corrosion, and if the amount is too much, it is easy to produce shrinkage cavities, which should be reduced as much as possible. The zinc content of the present invention is controlled at 0-0.05%.

Zr: Zirconium element can hinder the recrystallization process and refine the recrystallization grains. The content of zirconium in the present invention is controlled to be 0.03-0.06%.

Embodiment one:

Embodiment two:

Embodiment three:

Sample Mechanical Properties

name Tensile strength Rm(Mpa) Yield strength Rp0.2(Mpa) Elongation (%) Sample 1 390 380 12.99 Sample 2 390 380 12.20 Sample 3 395 385 12.46

According to the results of the above three models, the third embodiment has the highest strength, and the second embodiment has the best elongation.

The working principle and application process of the present invention: put the prepared raw materials into the smelting furnace for melting according to the technological requirements, and effectively remove the slag inclusions and gas in the melt by means of degassing and slag removal refining, and smelt the molten aluminum Cast aluminum alloy ingots through a deep well casting system, place the aluminum alloy ingots at 565±5°C for homogenization, heat for 6-8 hours, and cool them with strong water until they are cooled to 80±5°C. The homogenized aluminum rods are sent into the natural gas aluminum rod heating furnace for heating through mechanical devices. There are four heating zones in the aluminum rod furnace. The first stage is set at 350°C, the second stage is set at 450°C, and the third stage The setting is 480°C, and the fourth stage is set at 510°C. The ingot is sawed into short aluminum rods with a length of 800-1200mm by the hot saw device, and then sent into the ingot barrel of the extrusion machine for extrusion molding, and the extruded profile is exported The temperature is 520-540°C, and the extruded profiles are stretched and straightened according to the deformation of 0.8%-1.2%, and the internal stress is eliminated. The stretched profiles are sawed and framed, and sent to the aging furnace within 8 hours The aging treatment is carried out inside, and the aging is divided into two stages. The first-stage time temperature is 125±5°C, and the heat preservation is 4h. The second-stage aging temperature is 160±5°C, and the heat preservation is 2h. finished product.

The above are the preferred embodiments of the present invention, and those skilled in the art of the present invention can also change and modify the above-mentioned embodiments. Therefore, the present invention is not limited to the above-mentioned specific embodiments. Any obvious improvements, substitutions or variations made on the basis of the above-mentioned methods belong to the protection scope of the present invention.

Claims (5)

1. A high-strength aluminum alloy profile for energy storage, characterized in that: the chemical composition of the aluminum alloy is Mg: 1.0-1.05%, Si: 0.70-0.75%, Cu: 0.28-0.33%. Mn: 0.05～0.1%, Cr: 0.08～0.13%, Ti: 0.03～0.08%, Fe: 0.1～0.2%, Zn: 0～0.05%, Zr: 0.03～0.06%, The balance is Al. 2. A method for preparing an energy-storage high-strength aluminum alloy profile according to claim 1, wherein the method comprises the following steps: Step 1: Melting and casting: Put the prepared raw materials into the melting furnace to melt, and effectively remove the slag inclusions and gases in the melt by means of degassing and slag removal refining, and cast the smelted aluminum liquid into aluminum through the deep well casting system alloy ingot; Step 2: Homogenization: place the aluminum alloy ingot at 565±5°C for homogenization treatment, and heat for 6-8h; Step 3: Cooling: cooling with strong water to 80±5°C; Step 4: Extrusion: send the homogenized aluminum rods into the natural gas aluminum rod heating furnace for heating through a mechanical device. There are four heating areas in the aluminum rod furnace. The first stage is set at 350 °C, and the second stage The setting is 450°C, the third stage is set at 480°C, and the fourth stage is set at 510°C. The ingot is cut into short aluminum rods with a length of 800-1200mm by a hot saw device and then sent into the ingot barrel of the extruder. Extrusion molding, the outlet temperature of the extruded profile is 520-540°C; Step 5: Stretch: Stretch and straighten the extruded profile according to the deformation amount of 0.8%-1.2%, and eliminate the internal stress; Step 6: Artificial aging: Cut the stretched profile into a frame and send it to the aging furnace for aging treatment within 8 hours. The aging is divided into two levels. The aging temperature is 160±5°C, heat preservation for 2 hours, and after being out of the furnace, use an axial fan to blow and cool to room temperature to obtain the finished aluminum alloy profile. 3. A method for preparing energy-storage high-strength aluminum alloy profiles according to claim 2, characterized in that: the aluminum alloy ingot is heated by hot air, and the gas is fed into the hot air furnace for combustion, and the combustion generates After the high-temperature flue gas and cold air are mixed, the induced draft fan sends it into the silo through the pipeline to heat the alloy. The fan is used to feed and mix at a constant speed. 4. It is characterized by uniform heating, not easy to sinter, and makes the pressure of each position inside the same uniform to avoid air explosion. 5. A method for preparing an energy-storage high-strength aluminum alloy profile according to claim 2, characterized in that: the extruding machine ingot barrel is extruded and extruded by a screw push method, and the screw push is multiple Spiral roller push.

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