CN114622115B - High-strength high-toughness automobile aluminum alloy bar and production method thereof - Google Patents
High-strength high-toughness automobile aluminum alloy bar and production method thereof Download PDFInfo
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- CN114622115B CN114622115B CN202210201744.4A CN202210201744A CN114622115B CN 114622115 B CN114622115 B CN 114622115B CN 202210201744 A CN202210201744 A CN 202210201744A CN 114622115 B CN114622115 B CN 114622115B
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
- C22C21/02—Alloys based on aluminium with silicon as the next major constituent
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/04—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of bars or wire
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D43/00—Mechanical cleaning, e.g. skimming of molten metals
- B22D43/001—Retaining slag during pouring molten metal
- B22D43/004—Retaining slag during pouring molten metal by using filtering means
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0075—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for rods of limited length
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/026—Alloys based on aluminium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/03—Making non-ferrous alloys by melting using master alloys
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/002—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working by rapid cooling or quenching; cooling agents used therefor
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
- C22F1/043—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon of alloys with silicon as the next major constituent
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Abstract
The invention belongs to the technical field of metal processing, and particularly relates to a high-strength high-toughness automobile aluminum alloy bar and a production method thereof. The high-strength high-toughness automobile aluminum alloy bar consists of the following chemical components in percentage by mass: 1.1 to 1.2 percent of Si, less than 0.15 percent of Fe, 0.55 to 0.65 percent of Cu, 0.6 to 0.7 percent of Mn, 0.9 to 1.0 percent of Mg, 0.2 to 0.25 percent of Cr, less than 0.05 percent of Zn, less than 0.03 percent of Ti, and the balance of Al and unavoidable impurities. The high-strength high-toughness automobile aluminum alloy bar produced by the invention has the yield strength of more than 395MPa, the tensile strength of more than 425MPa and the elongation of 10 percent, and the performance of the automobile aluminum alloy bar is improved by more than 20 percent compared with the performance of aluminum alloy used in the market. And (3) refining for three times in the production process respectively, namely refining for two times in the holding furnace, and online degassing in the casting process, and homogenizing after casting is finished to improve the performance and ensure two-stage homogenization.
Description
Technical Field
The invention belongs to the technical field of metal processing, and particularly relates to a high-strength high-toughness automobile aluminum alloy bar and a production method thereof.
Background
The light weight has become one of the hot spots in the world automobile industry, and the aluminum alloy has the characteristics of light weight and high strength, so that the aluminum alloy is the most main light weight material. However, the general automotive materials in the market today can only reach: the yield strength is 320MPa, the tensile strength is 360MPa, the elongation is 10%, the mechanical property is poor, and the increasingly strict use requirements cannot be met.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a high-strength high-toughness automobile aluminum alloy bar which has the characteristics of high yield strength, high tensile strength and high elongation; the invention also provides a preparation method thereof, which is scientific, reasonable, simple and easy to implement.
The high-strength high-toughness automobile aluminum alloy bar provided by the invention comprises the following chemical components in percentage by mass: 1.1 to 1.2 percent of Si, less than 0.15 percent of Fe, 0.55 to 0.65 percent of Cu, 0.6 to 0.7 percent of Mn, 0.9 to 1.0 percent of Mg, 0.2 to 0.25 percent of Cr, less than 0.05 percent of Zn, less than 0.03 percent of Ti, and the balance of Al and unavoidable impurities.
The invention relates to a production method of a high-strength high-toughness automobile aluminum alloy bar, which comprises the following steps:
(1) Preparing and feeding:
the aluminum material is prepared according to chemical components and put into a furnace.
1. And determining the weight of solid materials and the type of furnace burden according to the production plan.
2. Charging materials are added according to the sequence of small sheets, thin plates, thick plates, coils and aluminum ingots; the aluminum ingot must be removed from the strip before it can be added. Ensuring the purity of the material.
3. The wet materials and the waste materials with much oil are not allowed to be added, the scattered waste materials are firstly added during the feeding, and the massive waste materials or aluminum ingots are subsequently added, so that the burning loss is reduced.
4. The cooling material is controlled within 30 minutes as much as possible, so that excessive heat loss and increase of hydrogen content are avoided.
(2) Melting:
the smelting temperature is controlled between 730 and 760 ℃. If the melt is over-temperature (760 ℃ or above), solid materials with the charge amount of 5% -10% are added for cooling.
(3) And (3) batching:
other raw materials are added according to chemical components under continuous stirring.
1. When the metal additive or the intermediate alloy is added into the alloy, the temperature is controlled to be 740-760 ℃, and the electromagnetic stirrer is started in advance before the alloy is added into the alloy, so that the timely absorptivity of the additive is ensured.
2. The stirring time is not less than 30 minutes, and the uniformity of the components is ensured.
(4) Refining:
the powder spraying refining agent and high-purity argon are adopted, the purity of the argon is guaranteed to be 99.999 percent, the refining time is 10 to 40 minutes, and preferably 20 to 40 minutes are needed in each furnace.
The powder spraying refining agent adopts the brand of Du Ersha Litt of the Germany ROESC group.
(5) Slag skimming;
and carrying out large cleaning after each furnace is completed, so as to ensure that no residue of the last furnace is left in the furnace.
(6) Sampling and assaying;
sampling points: both sides of the furnace door;
when sampling, two samples are taken at two sides of the furnace door, the components are required to be approximately similar, when the difference of the main alloy element values is 20% or the mass percentage value of any element is more than 0.1%, the components are regarded as uneven, and the samples are required to be sampled and tested after being stirred again and standing for 10 minutes.
(7) Converter and secondary refining;
the temperature of the converter is controlled to 740-760 ℃, high-purity argon is adopted, and the refining time is 10-40 minutes, preferably 20-40 minutes.
1. The residence time of the melt in the converter is too long (more than 2 hours), and the chemical components must be confirmed by sampling again before the converter.
2. The temperature of the converter is controlled to 740-760 ℃, wherein the front of the high magnesium alloy converter is controlled according to the middle upper limit.
3. And (3) strictly forbidden smelting furnace, wherein the refining is started without the completion of the converter, and 99.99% high-purity argon is used for refining. Refining time in winter and spring is not less than 20 minutes. The refining time in summer and autumn is not less than 30 minutes.
(8) Standing, cross casting, casting production preparation, filling, casting, homogenizing treatment and ending:
1. sampling at two sides of the furnace door of the heat preservation furnace before casting to confirm whether the chemical components are qualified or not, ensuring that the components are not lower than the lower limit, and ensuring that the casting temperature is controlled at +/-3 ℃.
2. If the residence time of the aluminum liquid in the holding furnace is too long (more than 2 hours), refining is needed again 1 hour before casting is prepared, chemical components are confirmed by sampling again, and casting can be performed after refining again, and the standing time of more than 30 minutes is needed.
3. The cast filter plates were rated for filtration using an Inlet Sili 50 mesh filter plate.
4. All residues in the launders must be cleaned up and cleaned up by using a dust collector, and the cleaning is completed to uniformly brush boron nitride, so that the launders are smooth and tidy.
5. The aluminum liquid is slowly put into a degassing furnace box before being filled with the aluminum liquid, the excessive burning phenomenon is caused by the excessively high forbidden temperature before the aluminum liquid enters the filtering box, the filtering plate is fully preheated before the aluminum liquid enters the filtering box, and the filtering plate is found to have floating condition during casting to immediately stop casting.
6. Slag is forbidden to be formed in the launder in the casting process;
7. the internal guide type hydraulic casting machine has the advantages of large bearing capacity, stable and reliable operation, high control precision, convenient construction and installation and the like, and the internal guide type hydraulic casting machine arranges the guide posts in the hydraulic cylinder, so that the influence of aluminum liquid splashing on the guide posts is effectively avoided, and the running stability of the casting machine is greatly improved.
The homogenizing treatment steps are as follows: heating is started after charging, the furnace temperature reaches 280-350 ℃, heat preservation is started for 8 hours, after heat preservation is performed for 8 hours, heating is started to 545-555 ℃, and heat preservation is performed for 10 hours;
preferably, the homogenizing treatment step is: heating is started after charging, the furnace temperature reaches 280-350 ℃, the temperature is delayed for 1.5-2.5 hours, the heat preservation is started for 8 hours, after the heat preservation is performed for 8 hours, the temperature is started to be heated to 545-555 ℃, the temperature is delayed for 1.5-2 hours, and the heat preservation is performed for 10 hours;
more preferably, the homogenizing step is: heating is started after charging, the furnace temperature reaches 300 ℃ and then is delayed for 2 hours to enable the material temperature to reach 300 ℃, heat preservation is started for 8 hours, heating is started to 550 ℃ after heat preservation is performed for 8 hours, and the furnace temperature reaches 550 ℃ and then is delayed for 1 hour and 50 minutes to enable the material temperature to reach 550 ℃, and heat preservation is performed for 10 hours;
hot extrusion: the rod speed of the homogenized cast ingot is 2-7 mm, preferably 6mm, at the temperature of 460-520 ℃; the product speed is 1-15 m/min, preferably 15m/min;
quenching: carrying out online quenching on the extruded product, and cooling to below 50 ℃ at an outlet temperature of 530-560 ℃;
stretching: the stretching amount is 0.5-2%;
aging heat treatment: the artificial aging temperature is 150-200 ℃, and the heat preservation time is 2-10 h.
Wherein:
in the step (3), the stirring time is not less than 30 minutes.
In the step (6), when the sampling test is unqualified, stirring again, standing, sampling test, and entering the next step after the sampling test is qualified; and when the product is still unqualified, feeding or diluting. After the material is fed, stirring is carried out for more than 30 minutes to ensure that the components are uniformly mixed, and intermediate alloy is used for feeding; and diluting, namely adopting an aluminum ingot or electrolyzing pure aluminum water.
In the step (8), the standing time is 1 to 1.5 hours.
In the step (8), the cooling mode is through water cooling.
Compared with the prior art, the invention has the following beneficial effects:
1. the high-strength high-toughness automobile aluminum alloy bar produced by the invention has the yield strength of more than 395MPa, the tensile strength of more than 425MPa and the elongation of 10 percent, and the performance of the automobile aluminum alloy bar is improved by more than 20 percent compared with the performance of aluminum alloy used in the market, so that the automobile aluminum alloy bar reaches the best foreign (automobile aluminum alloy) level. At present, the novel material is successfully applied to some vehicle types, wherein the weight of a 4.5 ton light truck all-aluminum carriage in Futian is reduced by more than 50%, and according to the current industry policy, 700 kg of cargoes can be pulled up, so that the novel material has the advantages of energy saving, consumption reduction and considerable economic benefit.
2. The invention respectively performs three refining processes in the production process, namely online degassing in the two refining and casting processes of the holding furnace, and performs homogenization treatment after casting is finished to improve the performance and ensure two-stage homogenization.
Detailed Description
The invention is further illustrated below with reference to examples.
Example 1
The high-strength high-toughness automobile aluminum alloy bar consists of the following chemical components in percentage by mass: si1.13%, fe0.12%, cu0.60%, mn0.65%, mg0.95%, cr0.2%, zn0.03%, ti0.02%, and the balance of Al and unavoidable impurities.
The preparation method comprises the following steps:
(1) Preparing and feeding:
preparing aluminum materials according to chemical components and putting the aluminum materials into a furnace;
(2) Melting:
the smelting temperature is controlled at 750 ℃;
(3) And (3) batching:
adding other raw materials according to chemical components under continuous stirring;
(4) Refining:
adopting a powder spraying refining agent and high-purity argon, wherein the refining time is 20 minutes;
(5) Slag skimming;
(6) Sampling and assaying;
sampling points: both sides of the furnace door;
(7) Converter and secondary refining;
the temperature of the converter is controlled at 750 ℃, high-purity argon is adopted, and the refining time is 20 minutes;
(8) Standing, cross casting, casting production preparation, filling, casting, homogenizing treatment and ending:
the homogenizing treatment steps are as follows: heating is started after charging, the furnace temperature reaches 300 ℃ and then is delayed for 2 hours to enable the material temperature to reach 300 ℃, heat preservation is started for 8 hours, heating is started to 550 ℃ after heat preservation is performed for 8 hours, and the furnace temperature reaches 550 ℃ and then is delayed for 1 hour and 50 minutes to enable the material temperature to reach 550 ℃, and heat preservation is performed for 10 hours;
hot extrusion: the ingot after homogenization treatment has a rod speed of 6mm and a product speed of 15m/min at the temperature of 500 ℃;
quenching: carrying out online quenching on the extruded product, and cooling to below 50 ℃ at an outlet temperature of 550 ℃;
stretching: the stretching amount is 1.5%;
aging heat treatment: the artificial aging temperature is 170 ℃, and the heat preservation time is 5 hours.
Example 2
The high-strength high-toughness automobile aluminum alloy bar consists of the following chemical components in percentage by mass: si1.12%, fe0.13%, cu0.57%, mn0.65%, mg0.95%, cr0.21%, zn0.04%, ti0.01%, and the balance of Al and unavoidable impurities.
The preparation method comprises the following steps:
(1) Preparing and feeding:
preparing aluminum materials according to chemical components and putting the aluminum materials into a furnace;
(2) Melting:
the smelting temperature is controlled at 730 ℃;
(3) And (3) batching:
adding other raw materials according to chemical components under continuous stirring;
(4) Refining:
adopting a powder spraying refining agent and high-purity argon, wherein the refining time is 22 minutes;
(5) Slag skimming;
(6) Sampling and assaying;
sampling points: both sides of the furnace door;
(7) Converter and secondary refining;
the temperature of the converter is controlled at 740 ℃, high-purity argon is adopted, and the refining time is 21 minutes;
(8) Standing, cross casting, casting production preparation, filling, casting, homogenizing treatment and ending:
the homogenizing treatment steps are as follows: heating is started after charging, the temperature of the furnace is delayed for 2 hours after reaching 280 ℃ to enable the temperature of the material to reach 280 ℃, heat preservation is started for 8 hours, heating is started to 545 ℃ after heat preservation is performed for 8 hours, the temperature of the furnace is delayed for 1 hour and 50 minutes after reaching 545 ℃ to enable the temperature of the material to reach 545 ℃, and heat preservation is performed for 10 hours;
hot extrusion: the ingot after homogenization treatment has a rod speed of 5mm and a product speed of 15m/min at 480 ℃;
quenching: carrying out online quenching on the extruded product, and cooling to below 50 ℃ at the outlet temperature of 530 ℃;
stretching: the stretching amount was 1.7%;
aging heat treatment: the artificial aging temperature is 150 ℃, and the heat preservation time is 10 hours.
Example 3
The high-strength high-toughness automobile aluminum alloy bar consists of the following chemical components in percentage by mass: si1.2%, fe0.14%, cu0.6%, mn0.63%, mg0.97%, cr0.24%, zn0.03%, ti0.02%, and the balance of Al and unavoidable impurities.
The preparation method comprises the following steps:
(1) Preparing and feeding:
preparing aluminum materials according to chemical components and putting the aluminum materials into a furnace;
(2) Melting:
the smelting temperature is controlled to 760 ℃;
(3) And (3) batching:
adding other raw materials according to chemical components under continuous stirring;
(4) Refining:
adopting a powder spraying refining agent and high-purity argon, wherein the refining time is 21 minutes;
(5) Slag skimming;
(6) Sampling and assaying;
sampling points: both sides of the furnace door;
(7) Converter and secondary refining;
the temperature of the converter is controlled at 760 ℃, high-purity argon is adopted, and the refining time is 21 minutes;
(8) Standing, cross casting, casting production preparation, filling, casting, homogenizing treatment and ending:
the homogenizing treatment steps are as follows: heating is started after charging, the furnace temperature reaches 350 ℃ and then is delayed for 2 hours to enable the material temperature to reach 350 ℃, heat preservation is started for 8 hours, heating is started to reach 555 ℃ after heat preservation is performed for 8 hours, and the furnace temperature reaches 555 ℃ and then is delayed for 1 hour and 50 minutes to enable the material temperature to reach 555 ℃ and then heat preservation is performed for 10 hours;
hot extrusion: homogenizing the ingot, wherein the rod speed is 7mm and the product speed is 15m/min at 520 ℃;
quenching: carrying out online quenching on the extruded product, and cooling to below 50 ℃ at the outlet temperature of 548 ℃;
stretching: the stretching amount is 0.5%;
aging heat treatment: the artificial aging temperature is 180 ℃, and the heat preservation time is 2 hours.
Example 4
The high-strength high-toughness automobile aluminum alloy bar consists of the following chemical components in percentage by mass: si1.1%, fe0.12%, cu0.63%, mn0.69%, mg0.93%, cr0.22%, zn0.04%, ti0.01%, and the balance of Al and unavoidable impurities.
The preparation method comprises the following steps:
(1) Preparing and feeding:
preparing aluminum materials according to chemical components and putting the aluminum materials into a furnace;
(2) Melting:
the smelting temperature is controlled at 745 ℃;
(3) And (3) batching:
adding other raw materials according to chemical components under continuous stirring;
(4) Refining:
adopting a powder spraying refining agent and high-purity argon, wherein the refining time is 40 minutes;
(5) Slag skimming;
(6) Sampling and assaying;
sampling points: both sides of the furnace door;
(7) Converter and secondary refining;
the temperature of the converter is controlled at 755 ℃, high-purity argon is adopted, and the refining time is 25 minutes;
(8) Standing, cross casting, casting production preparation, filling, casting, homogenizing treatment and ending:
the homogenizing treatment steps are as follows: heating is started after charging, the furnace temperature reaches 320 ℃ and then is delayed for 2 hours to enable the material temperature to reach 320 ℃, heat preservation is started for 8 hours, heating is started to 550 ℃ after heat preservation is performed for 8 hours, and the furnace temperature reaches 550 ℃ and then is delayed for 1 hour and 50 minutes to enable the material temperature to reach 550 ℃, and heat preservation is performed for 10 hours;
hot extrusion: the ingot after homogenization treatment has a rod speed of 2mm and a product speed of 1m/min at the temperature of 510 ℃;
quenching: carrying out online quenching on the extruded product, and cooling to below 50 ℃ at an outlet temperature of 560 ℃;
stretching: the stretching amount was 2.0%;
aging heat treatment: the artificial aging temperature is 200 ℃, and the heat preservation time is 2 hours.
Example 5
The high-strength high-toughness automobile aluminum alloy bar consists of the following chemical components in percentage by mass: si1.15%, fe0.10%, cu0.65%, mn0.60%, mg1.0%, cr0.25%, zn0.02%, ti0.02%, and the balance of Al and unavoidable impurities.
The preparation method comprises the following steps:
(1) Preparing and feeding:
preparing aluminum materials according to chemical components and putting the aluminum materials into a furnace;
(2) Melting:
the smelting temperature is controlled at 745 ℃;
(3) And (3) batching:
adding other raw materials according to chemical components under continuous stirring;
(4) Refining:
adopting a powder spraying refining agent and high-purity argon, wherein the refining time is 23 minutes;
(5) Slag skimming;
(6) Sampling and assaying;
sampling points: both sides of the furnace door;
(7) Converter and secondary refining;
the temperature of the converter is controlled at 755 ℃, high-purity argon is adopted, and the refining time is 40 minutes;
(8) Standing, cross casting, casting production preparation, filling, casting, homogenizing treatment and ending:
the homogenizing treatment steps are as follows: heating is started after charging, the furnace temperature reaches 330 ℃ and then is delayed for 2 hours to enable the material temperature to reach 330 ℃, heat preservation is started for 8 hours, heating is started to 550 ℃ after heat preservation is performed for 8 hours, and the furnace temperature reaches 550 ℃ and then is delayed for 1 hour and 50 minutes to enable the material temperature to reach 550 ℃, and heat preservation is performed for 10 hours;
hot extrusion: the ingot after homogenization treatment has a rod speed of 6mm and a product speed of 15m/min at the temperature of 460 ℃;
quenching: carrying out online quenching on the extruded product, and cooling to below 50 ℃ at an outlet temperature of 545 ℃;
stretching: the stretching amount is 1.8%;
aging heat treatment: the artificial aging temperature is 170 ℃, and the heat preservation time is 4 hours.
Comparative example 1
The chemical composition and the preparation method of the automobile aluminum alloy bar are the same as those of the embodiment 1, and the differences are that: the homogenizing treatment steps are as follows:
and after the furnace is charged, heating is started, after the furnace temperature reaches 300 ℃, heat preservation is started for 8 hours, after heat preservation is performed for 8 hours, heating is started to 550 ℃, and heat preservation is performed for 10 hours.
Performance test:
the mechanical properties of the automobile aluminum alloy bars prepared in examples 1 to 5 and comparative example 1 were tested, and the test results are shown in Table 1.
Comparative example 2
The preparation method of the automobile aluminum alloy bar is the same as that of the embodiment 1, and the difference is that: the chemical components of the alloy are Si1.0, fe0.18, cu0.35%, mn0.45%, mg0.7%, cr0.1%, zn0.03%, ti0.02% and the balance of Al and unavoidable impurities.
Table 1 test results
| Yield strength (MPa) | Tensile Strength (MPa) | Elongation (%) | |
| Example 1 | 410 | 437 | 11.2 |
| Example 2 | 402 | 430 | 11.0 |
| Example 3 | 397 | 431 | 10.0 |
| Example 4 | 401 | 430 | 10.3 |
| Example 5 | 395 | 425 | 10.1 |
| Comparative example 1 | 331 | 380 | 10.0 |
| Comparative example 2 | 325 | 364 | 10.0 |
Claims (6)
1. The utility model provides a high-strength high-toughness car aluminum alloy rod which characterized in that: the composite material consists of the following chemical components in percentage by mass: 1.1 to 1.2 percent of Si, less than 0.15 percent of Fe, 0.55 to 0.65 percent of Cu, 0.6 to 0.7 percent of Mn, 0.9 to 1.0 percent of Mg, 0.2 to 0.25 percent of Cr, less than 0.05 percent of Zn, less than 0.03 percent of Ti, and the balance of Al and unavoidable impurities;
the production method of the high-strength high-toughness automobile aluminum alloy bar comprises the following steps:
(1) Preparing and feeding:
preparing aluminum materials according to chemical components and putting the aluminum materials into a furnace;
(2) Melting:
the smelting temperature is controlled at 730-760 ℃;
(3) And (3) batching:
adding other raw materials according to chemical components under continuous stirring;
(4) Refining:
adopting a powder spraying refining agent and high-purity argon, wherein the refining time is 10-40 minutes;
(5) Slag skimming;
(6) Sampling and assaying;
sampling points: both sides of the furnace door;
(7) Converter and secondary refining;
the temperature of the converter is controlled to 740-760 ℃, high-purity argon is adopted, and the refining time is 10-40 minutes;
(8) Standing, cross casting, casting production preparation, filling, casting, homogenizing treatment and ending:
the homogenizing treatment steps are as follows: heating is started after charging, the furnace temperature reaches 300 ℃ and then is delayed for 2 hours to enable the material temperature to reach 300 ℃, heat preservation is started for 8 hours, heating is started to 550 ℃ after heat preservation is performed for 8 hours, and the furnace temperature reaches 550 ℃ and then is delayed for 1 hour and 50 minutes to enable the material temperature to reach 550 ℃, and heat preservation is performed for 10 hours;
hot extrusion: the rod speed of the homogenized cast ingot is 2-7 mm/s and the product speed is 1-15 m/min under the temperature of 460-520 ℃;
quenching: carrying out online quenching on the extruded product, and cooling to below 50 ℃ at an outlet temperature of 550 ℃;
stretching: the stretching amount is 0.5-2%;
aging heat treatment: the artificial aging temperature is 170 ℃, and the heat preservation time is 5 hours.
2. The high strength and toughness automotive aluminum alloy bar according to claim 1, wherein: in the step (3), the stirring time is not less than 30 minutes.
3. The high strength and toughness automotive aluminum alloy bar according to claim 1, wherein: in the step (6), when the sampling test is unqualified, stirring again, standing, sampling test, and entering the next step after the sampling test is qualified; and when the product is still unqualified, feeding or diluting.
4. A high strength and toughness automotive aluminum alloy bar according to claim 3, wherein: after the material is supplemented, stirring is carried out for more than 30 minutes; and diluting, namely adopting an aluminum ingot or electrolyzing pure aluminum water.
5. The high strength and toughness automotive aluminum alloy bar according to claim 1, wherein: in the step (8), the standing time is 1 to 1.5 hours.
6. The high strength and toughness automotive aluminum alloy bar according to claim 1, wherein: in the step (8), the cooling mode is through water cooling.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210201744.4A CN114622115B (en) | 2022-03-03 | 2022-03-03 | High-strength high-toughness automobile aluminum alloy bar and production method thereof |
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| CN106350708A (en) * | 2016-08-31 | 2017-01-25 | 无锡海特铝业有限公司 | High-strength coarse-grain-ring-free aluminum alloy bar for automotive control arm and preparation method of aluminum alloy bar |
| CN108118210A (en) * | 2017-11-28 | 2018-06-05 | 中铝材料应用研究院有限公司 | A kind of processing method of aluminium alloy and its extrudate |
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| CN106350708A (en) * | 2016-08-31 | 2017-01-25 | 无锡海特铝业有限公司 | High-strength coarse-grain-ring-free aluminum alloy bar for automotive control arm and preparation method of aluminum alloy bar |
| CN108118210A (en) * | 2017-11-28 | 2018-06-05 | 中铝材料应用研究院有限公司 | A kind of processing method of aluminium alloy and its extrudate |
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