CN115233017A - Method for manufacturing high-pressure cast aluminum alloy - Google Patents
Method for manufacturing high-pressure cast aluminum alloy Download PDFInfo
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- CN115233017A CN115233017A CN202210952185.0A CN202210952185A CN115233017A CN 115233017 A CN115233017 A CN 115233017A CN 202210952185 A CN202210952185 A CN 202210952185A CN 115233017 A CN115233017 A CN 115233017A
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- 229910000838 Al alloy Inorganic materials 0.000 title claims abstract description 89
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 26
- 238000000034 method Methods 0.000 title description 12
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 44
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 37
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 37
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims abstract description 25
- 239000011651 chromium Substances 0.000 claims abstract description 25
- 238000007670 refining Methods 0.000 claims abstract description 25
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 23
- 239000000956 alloy Substances 0.000 claims abstract description 22
- 229910052742 iron Inorganic materials 0.000 claims abstract description 22
- 229910052761 rare earth metal Inorganic materials 0.000 claims abstract description 21
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 20
- 238000005266 casting Methods 0.000 claims abstract description 19
- 239000007788 liquid Substances 0.000 claims abstract description 19
- 150000002910 rare earth metals Chemical class 0.000 claims abstract description 18
- 238000004512 die casting Methods 0.000 claims abstract description 17
- 239000011777 magnesium Substances 0.000 claims abstract description 16
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims abstract description 14
- 239000007789 gas Substances 0.000 claims abstract description 14
- 229910052749 magnesium Inorganic materials 0.000 claims abstract description 14
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 13
- 239000010703 silicon Substances 0.000 claims abstract description 12
- 229910052712 strontium Inorganic materials 0.000 claims abstract description 10
- CIOAGBVUUVVLOB-UHFFFAOYSA-N strontium atom Chemical compound [Sr] CIOAGBVUUVVLOB-UHFFFAOYSA-N 0.000 claims abstract description 10
- 239000010936 titanium Substances 0.000 claims abstract description 9
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims abstract description 8
- 229910052719 titanium Inorganic materials 0.000 claims abstract description 8
- 238000007872 degassing Methods 0.000 claims abstract description 7
- 238000010438 heat treatment Methods 0.000 claims abstract description 7
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 6
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 5
- 239000004411 aluminium Substances 0.000 claims abstract description 5
- YNDGDLJDSBUSEI-UHFFFAOYSA-N aluminum strontium Chemical compound [Al].[Sr] YNDGDLJDSBUSEI-UHFFFAOYSA-N 0.000 claims abstract description 5
- 239000001257 hydrogen Substances 0.000 claims abstract description 5
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 5
- 239000012535 impurity Substances 0.000 claims abstract description 5
- 230000008018 melting Effects 0.000 claims abstract description 5
- 238000002844 melting Methods 0.000 claims abstract description 5
- 238000003825 pressing Methods 0.000 claims abstract description 5
- 239000000706 filtrate Substances 0.000 claims abstract description 4
- 239000010949 copper Substances 0.000 claims description 11
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 10
- 229910052802 copper Inorganic materials 0.000 claims description 9
- 229910052746 lanthanum Inorganic materials 0.000 claims description 7
- 229910052684 Cerium Inorganic materials 0.000 claims description 6
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 6
- GWXLDORMOJMVQZ-UHFFFAOYSA-N cerium Chemical compound [Ce] GWXLDORMOJMVQZ-UHFFFAOYSA-N 0.000 claims description 6
- FZLIPJUXYLNCLC-UHFFFAOYSA-N lanthanum atom Chemical compound [La] FZLIPJUXYLNCLC-UHFFFAOYSA-N 0.000 claims description 6
- 229910052691 Erbium Inorganic materials 0.000 claims description 5
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 5
- 239000011701 zinc Substances 0.000 claims description 5
- 229910052725 zinc Inorganic materials 0.000 claims description 5
- UYAHIZSMUZPPFV-UHFFFAOYSA-N erbium Chemical compound [Er] UYAHIZSMUZPPFV-UHFFFAOYSA-N 0.000 claims description 4
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims description 3
- 229910052748 manganese Inorganic materials 0.000 claims description 3
- 239000011572 manganese Substances 0.000 claims description 3
- 229910052759 nickel Inorganic materials 0.000 claims description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 11
- 238000005452 bending Methods 0.000 description 9
- 239000000463 material Substances 0.000 description 9
- 239000000047 product Substances 0.000 description 8
- 238000005728 strengthening Methods 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- 239000011159 matrix material Substances 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 230000007423 decrease Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000005496 eutectics Effects 0.000 description 3
- 229910018182 Al—Cu Inorganic materials 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 239000006104 solid solution Substances 0.000 description 2
- 229910018131 Al-Mn Inorganic materials 0.000 description 1
- 229910018461 Al—Mn Inorganic materials 0.000 description 1
- 229910018575 Al—Ti Inorganic materials 0.000 description 1
- 229910019018 Mg 2 Si Inorganic materials 0.000 description 1
- 229910017706 MgZn Inorganic materials 0.000 description 1
- 229910000676 Si alloy Inorganic materials 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000003679 aging effect Effects 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- CSDREXVUYHZDNP-UHFFFAOYSA-N alumanylidynesilicon Chemical compound [Al].[Si] CSDREXVUYHZDNP-UHFFFAOYSA-N 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000001953 recrystallisation Methods 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 235000014347 soups Nutrition 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
Images
Classifications
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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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
-
- 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
-
- 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
- C22C1/06—Making non-ferrous alloys with the use of special agents for refining or deoxidising
-
- 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
- C22C21/04—Modified aluminium-silicon alloys
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The application discloses a manufacturing method of a high-pressure cast aluminum alloy, which comprises the following steps: melting aluminum ingots, and controlling the temperature of aluminum liquid to be between 710 and 730 ℃; the heat treatment-free high-pressure cast aluminum alloy comprises the following components: 7.0 to 9.0% by weight of silicon, 0.1 to 0.25% by weight of iron, 0.15 to 0.35% by weight of chromium, 0.1 to 0.4% by weight of magnesium, 0.05 to 0.15% by weight of titanium, 0.01 to 0.03% by weight of strontium, 0.01 to 0.3% by weight of rare earths, up to 0.03% by weight of a single impurity element, and the remainder being aluminium, wherein the ratio of chromium to iron is greater than 2.0, and cannot exceed 3.5:1, adding chromium elements and rare earth into the filtrate in a ratio of more than 1.5 to less than 1 to less than 2.5, and heating the molten aluminum to melt the added components; pressing an aluminum alloy sodium-free refining agent into the aluminum alloy by a degassing machine for refining, adding an aluminum-strontium intermediate alloy containing 0.01-0.03 wt% of strontium during refining, and refining for a preset time; detecting the gas content by a hydrogen detector, and when the gas content reaches below 0.15ml/100g, die-casting by aluminum alloy high-pressure casting equipment.
Description
Technical Field
The invention relates to the field of high-pressure cast aluminum alloy, in particular to a manufacturing method of high-pressure cast aluminum alloy.
Background
The weight of the pure electric vehicle power system is increased by about 40% compared with that of a fuel power system, and the material selection and arrangement of a vehicle body structure and related parts are seriously influenced. Experiments prove that the mass of the automobile is reduced by half, and the fuel consumption is also reduced by nearly half. The lightweight is a necessary way for improving the driving range of the new energy automobile.
The aluminum alloy has low density, high strength similar to or superior to that of high quality steel, high plasticity, excellent electric conductivity, heat conductivity and corrosion resistance. Aluminum alloy materials are increasingly widely applied to electric automobiles, and aluminum alloy casting processes are basically popularized for automobile parts, mobile parts, engine parts, transmission parts, air conditioners, parts of air conditioners and the like. Especially, in the current pure electric vehicle structural part, the die casting of the die casting machine with 6000 tons begins from Tesla, and the domestic new energy host factory correspondingly develops products matched with the die casting machine with 6000 tons or more, and the mechanical performance requirement is required to be met under the condition of filling due to large projection area and long flow of the products.
The patent with publication number CN110735072A discloses an aluminum alloy, which relies on balanced proportioning of three elements of copper, magnesium and zinc to reach material performance by long-time natural aging, and the strengthening phase is mainly Mg 2 Si、MgZn 2 、Al 2 Cu solid solution strengthening and excess phase intergranular strengthening, but the excess strengthening phase produces brittle phases in intergranular spaces, resulting in brittle materials being formed.
At present, for meeting SPR riveting of a subsequent procedure, the automobile structural part needs to meet the requirement that the elongation of a product body is more than 10%. The process commonly available on the market is T7 treated with SF36 material. After T7 treatment, the tensile strength of the aluminum alloy material is larger than 180Mpa, the yield strength is larger than 120Mpa, and the elongation is larger than 10%. However, in the whole production process, the investment cost is high, the process is complicated, and the air hole defect is inevitably generated in the high-pressure casting process, so that air bubbles appear during high-temperature heat treatment, and the product is unqualified.
Disclosure of Invention
One advantage of the present invention is to provide a method for manufacturing a high pressure cast aluminum alloy, wherein the die cast aluminum alloy manufactured by the method for manufacturing a high pressure cast aluminum alloy has a tensile yield limit rp0.2 of >120MPa, a breaking elongation a of >10.0%, a tensile strength Rm of >240MPa, and a bending angle of greater than 35 degrees in an as-cast state, and meets a requirement that the bending angle of an automobile structure is 20 ° or more due to collision.
An advantage of the present invention is to provide a manufacturing method of a die-cast aluminum alloy, in which a die-cast aluminum alloy product manufactured by the manufacturing method of a high-pressure cast aluminum alloy can also have a bending angle of up to 20 ° or more at the wall thickness and have high hardness and plasticity.
To achieve at least one of the above advantages, the present invention provides a heat treatment-free method, wherein the method for manufacturing the high-pressure cast aluminum alloy comprises the steps of:
melting aluminum ingots, and controlling the temperature of aluminum liquid to be between 710 and 730 ℃;
wherein the high pressure cast aluminum alloy comprises the following components:
7.0 to 9.0 wt% silicon;
0.1 to 0.25 wt.% of iron;
0.15 to 0.35 weight percent chromium;
0.1 to 0.4% by weight of magnesium;
0.05 to 0.15 weight percent titanium;
0.01 to 0.03 weight percent strontium; 0.01 to 0.3% by weight of rare earths, up to 0.03% by weight of the individual impurity elements, and the balance aluminium, wherein the ratio of chromium to iron is greater than 2.0 and cannot exceed 3.5:1, adding chromium elements and rare earth into the filtrate in a ratio of more than 1.5 to less than 1 to less than 2.5, and heating aluminum liquid to melt the added components;
pressing an aluminum alloy sodium-free refining agent into the aluminum alloy by a degassing machine for refining, adding an aluminum-strontium intermediate alloy containing 0.01-0.03 weight percent of strontium during refining, and refining for a preset time to remove gas in the aluminum liquid;
detecting the gas content by a hydrogen detector, and when the gas content reaches below 0.15ml/100g, die-casting by aluminum alloy high-pressure casting equipment to form the high-pressure casting heat-treatment-free aluminum alloy, otherwise, continuously refining.
According to an embodiment of the invention, the iron content is between 0.1 and 0.15 wt.%.
According to an embodiment of the present invention, the content of the rare earth is 0.1 to 0.25 wt%.
According to an embodiment of the present invention, the rare earth is at least one selected from lanthanum, cerium, and erbium.
According to an embodiment of the invention, the high pressure cast aluminum alloy includes at most 0.2 wt.% copper.
According to an embodiment of the invention, the high pressure cast aluminum alloy includes up to 0.1 wt.% manganese.
According to an embodiment of the invention, the high pressure cast aluminum alloy includes at most 0.1 wt.% nickel.
According to an embodiment of the invention, the high pressure cast aluminum alloy includes at most 0.1 wt.% zinc.
According to one embodiment of the invention, the ratio of chromium to iron is 2.5.
According to an embodiment of the invention, the ratio between chromium and rare earth is preferably 2.0.
Drawings
FIG. 1 is a schematic diagram showing the effect of the amount of elemental silicon added on the fluidity of an as-cast aluminum alloy.
FIG. 2 is a schematic diagram showing the effect of the added amount of silicon on the bending angle of the aluminum alloy after casting.
Detailed Description
The following description is presented to disclose the invention so as to enable any person skilled in the art to practice the invention. The preferred embodiments in the following description are given by way of example only, and other obvious variations will occur to those skilled in the art. The basic principles of the invention, as defined in the following description, may be applied to other embodiments, variations, modifications, equivalents, and other technical solutions without departing from the spirit and scope of the invention.
The heat-treatment-free high-pressure cast aluminum alloy includes:
7.0 to 9.0 wt% silicon;
0.1 to 0.25 wt.% of iron;
up to 0.2 wt% copper;
0.15 to 0.35 weight percent chromium;
up to 0.1 wt.% manganese;
0.1 to 0.4% by weight of magnesium;
up to 0.1 wt.% nickel;
up to 0.1 wt.% zinc;
0.05 to 0.15 weight percent titanium;
0.01 to 0.03 weight percent strontium;
0.01 to 0.3 wt% of rare earth, at most 0.03 wt% of single impurity element, and the balance of aluminum.
Preferably, the rare earth is at least one selected from lanthanum, cerium and erbium.
In particular, it is worth mentioning that the ratio of chromium to iron is greater than 2.0, and cannot exceed 3.5:1. preferably, the ratio of chromium to iron is 2.5. Also preferably, the ratio between the chromium element and the rare earth is preferably 2.0.
It is worth mentioning that the addition of chromium in an amount of at most 0.35 wt.% to the high pressure cast aluminum alloy can prevent the high pressure cast aluminum alloy from sticking during the casting process; too much Cr will result in more Al 3 The Cr phase, which leads to an increase in strength, but causes a decrease in elongation of the cast aluminum alloy and a decrease in plasticity of the high-pressure cast aluminum alloy, tends to make the finally formed high-pressure cast aluminum alloy poor in bending properties, particularly at thick walls of the high-pressure cast aluminum alloy.
In addition, the addition of the chromium element can avoid the formation of coarse flaky AlFeSi phases, and once the proportion of the added chromium and iron is not well controlled, the coarse flaky AlFeSi phases tend to reduce the plasticity of the finally formed high-pressure cast aluminum alloy, so that the mechanical properties of the high-pressure cast aluminum alloy, such as elongation at break, bending property and the like, cannot meet the corresponding requirements. That is, the ratio of chromium to iron is controlled to simultaneously improve the as-cast properties (non-sticking) of the cast aluminum alloy and the mechanical properties after casting.
The proportion of iron in the high-pressure cast aluminium alloy is at most 0.25% by weight, with iron in this range. Preferably 0.1 to 0.15 wt%. And an increase in iron content increases the strength of the cast aluminum alloy but decreases the plasticity of the cast aluminum alloy. The iron content is too low, and the mold sticking condition can be generated due to the affinity of aluminum liquid and a mold in the die casting process of a large structural part.
It is worth mentioning that the addition of the rare earth elements can increase the recrystallization temperature of the alloy and significantly refine the grains.
Especially for the wall thickness position of large casting cast aluminum alloy, the rare earth elements can refine the size of an aluminum matrix, improve the appearance of an iron phase and improve the tensile strength, elongation and hardness of a product.
However, if the ratio of the added chromium to (at least one rare earth of lanthanum, cerium and bait) is too high, the rare earth can not fully refine the blocky AlFeSi phase, so that the ratio of the blocky AlFeSi phase is high, the plasticity of the material is influenced, and the bending performance of the finally formed high-pressure cast aluminum alloy is poor; if the ratio is too low, the excessive rare earth is dissolved in the aluminum matrix in a solid state to increase the strength of the high-pressure cast aluminum alloy, or the plasticity of the high-pressure cast aluminum alloy is lowered, so that the bending angle cannot be satisfied. Preferably, 0.01-0.3 wt% of at least one rare earth of lanthanum, cerium and bait is added. More preferably 0.1 to 0.25 wt% of at least one rare earth of lanthanum, cerium, erbium.
In the above-described examples, the aluminum alloy for high-pressure casting contains silicon in an amount of 7.0 to 9.0 wt.% based on the aluminum alloy for high-pressure casting, and the aluminum alloy for die casting in this range is a hypoeutectic aluminum alloy, and has excellent natural aging properties and good fluidity (fig. 1) after die casting, and can achieve both a bending angle (fig. 2), and has a low solidification shrinkage and a low tendency to hot cracking of a casting.
The addition of 0.1 to 0.4 wt.% magnesium, up to 0.2 wt.% copper, up to 0.1 wt.% manganese, and up to 0.1 wt.% zinc all contribute to strengthening of the high pressure cast aluminum alloy when it is made, thereby increasing the as-cast tensile yield rp0.2 and tensile strength Rm of the high pressure cast aluminum alloy.
In particular, in the above-mentioned high-pressure cast aluminum alloy, when the content of magnesium in the high-pressure cast aluminum alloy is 0.1 to 0.4 wt.%, magnesium can enhance the strength and hardness of the alloy because a small amount of magnesium added to the aluminum-silicon alloy can form Mg 2 The specific content of the magnesium can be adjusted according to practical requirements of material properties by the Si phase, but the elongation is reduced when the content of the magnesium is increased.
According to the test, the tensile strength and yield strength are correspondingly increased within 5-10 MPa when the magnesium content is increased by 0.1%, but the elongation is reduced by 1-2.5%.
The proportion of copper in the cast aluminium alloy is at most 0.2 wt.%, and the copper forms Al with the aluminium matrix 2 Cu is in solid solution with an aluminum matrix, so that the strength is improved; under the condition of meeting the corrosion condition, the strength of the proper amount of copper reaches the peak value after the copper with the weight percent of 0.2 at most is added and naturally aged for 48 hours through field tests, and the strength is improved more after the copper is baked.
The content of titanium in the cast aluminum alloy is 0.05-0.15 wt%, and the ALTi is produced by titanium and aluminum 3 The effect of refining grains can be achieved, but the increase of the titanium content can cause the aluminum liquid to be subjected to segregation and precipitation when the aluminum liquid is static, and the fatigue strength of the product can be reduced.
And the added strontium can modify the form of the eutectic silicon, so that the generation of coarse flaky silicon phases is avoided. In other words, a fine rod-like eutectic silicon structure can be formed after the strontium is added. Therefore, the modified eutectic silicon has great influence on the mechanical properties of casting products, and particularly can greatly improve the elongation at break.
According to another aspect of the present invention, there is provided a method of making a high pressure cast aluminum alloy, wherein the method of making the high pressure cast aluminum alloy comprises:
s1, melting an aluminum ingot, and controlling the temperature of aluminum liquid to be 710-730 ℃;
wherein the high pressure cast aluminum alloy comprises the following components:
7.0 to 9.0 wt% silicon;
0.1 to 0.25 wt.% of iron;
0.15 to 0.35 weight percent chromium;
0.1 to 0.4 wt% magnesium;
0.05 to 0.15 weight percent titanium;
0.01 to 0.3% by weight of rare earths, up to 0.03% by weight of the individual impurity elements, and the balance aluminium, wherein the ratio of chromium to iron is greater than 2.0 and cannot exceed 3.5:1, adding chromium elements and rare earth into the filtrate in a ratio of more than 1.5 to less than 1 to less than 2.5, and heating aluminum liquid to melt the added components;
s2, pressing a sodium-free aluminum alloy refining agent into the aluminum alloy for refining through a degassing machine, adding an aluminum-strontium intermediate alloy containing 0.01-0.03 weight percent of strontium during refining, and refining for a preset time to remove gas in the aluminum liquid;
and S3, detecting the gas content through a hydrogen detector, and when the gas content reaches below 0.15ml/100g, die-casting through aluminum alloy high-pressure casting equipment to form the high-pressure casting heat-treatment-free aluminum alloy.
Preferably, the method for manufacturing the high-pressure casting heat-treatment-free aluminum alloy comprises the following steps:
s4, preparing materials and cleaning a furnace: preparing materials according to the alloy component proportion, and cleaning the furnace after the materials are prepared.
It is worth mentioning that the alloying elements are added in the form of pure alloys or master alloys.
For example, cu element is added in the form of Al-Cu master alloy, si element is added in the form of simple substance 3303 Si, mg element is added in the form of pure Mg ingot, mn element is added in the form of Al-Mn master alloy, ti element is added in the form of Al-Ti master alloy, cr element is added in the form of master alloy, sr element is added in the form of Sr master alloy, and rare earth elements such as La, ce and Er are added in the form of master alloy.
In the molten aluminum ingot, after the surface of the pure aluminum ingot is cleaned, the pure aluminum ingot and 3303 silicon are put into a resistance crucible for heating and smelting, and the temperature of the aluminum liquid is controlled between 710 ℃ and 730 ℃;
in the addition of the master alloy: when the temperature of the aluminum liquid reaches 720 ℃, adding the dried Al-Cu intermediate alloy, magnesium ingot, al-Ti and other intermediate alloys into the aluminum liquid, heating the aluminum liquid to 740 ℃, and preserving the heat for 15 minutes to ensure that the added intermediate alloy is completely melted;
when the temperature of the aluminum liquid is reduced to 710-730 ℃ during refining, modification and degassing, a movable rotary degassing machine is used for pressing the aluminum alloy sodium-free refining agent into the aluminum alloy for refining, and an aluminum-strontium intermediate alloy is added during refining for refining preset time. Preferably 10-30 minutes, and then slagging off and standing. And (3) if standing for 1 hour, detecting the gas content by using an online hydrogen detector after standing, performing die casting when the gas content reaches below 0.15ml/100g, and continuing the refining, modification and degassing process if the gas content does not reach the requirement.
Die-casting production verification:
1) Production equipment and auxiliary parts: 280T powerful die casting machine, automatic soup feeder, mold temperature machine, brand vacuum machine, special imported release agent for commercial die casting structural part, imported particle bead, 3mm 80mm 250mm self-made test piece mold (figure 1), 50mm punch and melting cup;
2) Controlling a die-casting process: controlling the temperature of the die-casting aluminum liquid at 680-690 ℃, the temperature of a die temperature machine at 160-170 ℃, the high-speed at 2.7-2.9m/S, the vacuum degree at 10-40 mbar and the pressurizing pressure at 65MPa;
3) The following is the performance of the die casting test piece with different component proportions tested by a three-stand tensile machine and an inlet extensometer after being cut according to the GBT228 standard test piece line.
The aluminum alloys cast under high pressure of the five examples were manufactured by the above-mentioned manufacturing process, and the properties thereof were measured, as shown in table 1 below.
TABLE 1
It will be appreciated by persons skilled in the art that the embodiments of the invention described above and shown in the drawings are given by way of example only and are not limiting of the invention. The advantages of the present invention have been fully and effectively realized. The functional and structural principles of the present invention have been shown and described in the embodiments, and any variations or modifications may be made to the embodiments of the present invention without departing from the principles described.
Claims (10)
1. The manufacturing method of the high-pressure casting aluminum alloy is characterized by comprising the following steps of:
melting aluminum ingots, and controlling the temperature of aluminum liquid to be between 710 and 730 ℃;
wherein the high pressure cast aluminum alloy comprises the following components:
7.0 to 9.0 wt% silicon;
0.1 to 0.25 wt.% of iron;
0.15 to 0.35 weight percent chromium;
0.1 to 0.4% by weight of magnesium;
0.05 to 0.15 weight percent titanium;
0.01 to 0.03 weight percent strontium;
0.01 to 0.3% by weight of rare earths, up to 0.03% by weight of the individual impurity elements, and the balance aluminium, wherein the ratio of chromium to iron is greater than 2.0 and cannot exceed 3.5:1, adding chromium elements and rare earth into the filtrate in a ratio of more than 1.5 to less than 1 to less than 2.5, and heating aluminum liquid to melt the added components;
pressing an aluminum alloy sodium-free refining agent into the aluminum alloy by a degassing machine for refining, adding an aluminum-strontium intermediate alloy containing 0.01-0.03 weight percent of strontium during refining, and refining for a preset time to remove gas in the aluminum liquid;
detecting the gas content by a hydrogen detector, and when the gas content reaches below 0.15ml/100g, die-casting by aluminum alloy high-pressure casting equipment to form the high-pressure casting heat-treatment-free aluminum alloy, otherwise, continuously refining.
2. The method of making a high pressure cast aluminum alloy of claim 1, wherein the iron content is from 0.1 to 0.15 wt.%.
3. The method of making a high pressure cast aluminum alloy of claim 1, wherein the rare earth is present in an amount of 0.1 to 0.25 wt.%.
4. The method of making a high pressure cast aluminum alloy as recited in any one of claims 1 to 3, wherein the rare earth is selected from at least one of lanthanum, cerium, and erbium.
5. The method of making a high pressure cast aluminum alloy of any of claims 1-3, wherein the high pressure cast aluminum alloy includes up to 0.2 wt.% copper.
6. The method of making a high pressure cast aluminum alloy of any of claims 1-3, wherein the high pressure cast aluminum alloy includes up to 0.1 wt.% manganese.
7. The method of making a high pressure cast aluminum alloy of any of claims 1-3, wherein the high pressure cast aluminum alloy includes up to 0.1 wt.% nickel.
8. The method of making a high pressure cast aluminum alloy of any of claims 1-3, wherein the high pressure cast aluminum alloy includes up to 0.1 wt.% zinc.
9. The method of making a high pressure cast aluminum alloy according to any one of claims 1 to 3, wherein the ratio of chromium to iron is 2.5.
10. The method of making a high pressure cast aluminum alloy according to any one of claims 1 to 3, wherein the ratio between chromium and rare earth is preferably 2.0.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116065063A (en) * | 2022-12-01 | 2023-05-05 | 帅翼驰新材料集团有限公司 | High-strength high-pressure casting aluminum alloy for new energy vehicle shell |
| CN116179903A (en) * | 2023-02-07 | 2023-05-30 | 帅翼驰新材料集团有限公司 | Low-carbon heat-treatment-free high-pressure casting aluminum alloy |
| CN116200635A (en) * | 2023-02-07 | 2023-06-02 | 帅翼驰新材料集团有限公司 | Manufacturing method of low-carbon heat-treatment-free high-pressure casting aluminum alloy |
| CN116287889A (en) * | 2023-03-07 | 2023-06-23 | 帅翼驰新材料集团有限公司 | Manufacturing method of high-pressure casting aluminum alloy for battery tray |
| CN116377262A (en) * | 2023-04-10 | 2023-07-04 | 帅翼驰新材料集团有限公司 | Manufacturing method of high-pressure casting aluminum alloy for brazing |
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| CN104498784A (en) * | 2014-12-25 | 2015-04-08 | 马鸿斌 | Novel aluminum-titanium alloy and preparation process thereof |
| CN113373352A (en) * | 2021-06-22 | 2021-09-10 | 帅翼驰新材料集团有限公司 | High-pressure cast aluminum alloy and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104498784A (en) * | 2014-12-25 | 2015-04-08 | 马鸿斌 | Novel aluminum-titanium alloy and preparation process thereof |
| CN113373352A (en) * | 2021-06-22 | 2021-09-10 | 帅翼驰新材料集团有限公司 | High-pressure cast aluminum alloy and preparation method thereof |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116065063A (en) * | 2022-12-01 | 2023-05-05 | 帅翼驰新材料集团有限公司 | High-strength high-pressure casting aluminum alloy for new energy vehicle shell |
| CN116179903A (en) * | 2023-02-07 | 2023-05-30 | 帅翼驰新材料集团有限公司 | Low-carbon heat-treatment-free high-pressure casting aluminum alloy |
| CN116200635A (en) * | 2023-02-07 | 2023-06-02 | 帅翼驰新材料集团有限公司 | Manufacturing method of low-carbon heat-treatment-free high-pressure casting aluminum alloy |
| CN116287889A (en) * | 2023-03-07 | 2023-06-23 | 帅翼驰新材料集团有限公司 | Manufacturing method of high-pressure casting aluminum alloy for battery tray |
| CN116377262A (en) * | 2023-04-10 | 2023-07-04 | 帅翼驰新材料集团有限公司 | Manufacturing method of high-pressure casting aluminum alloy for brazing |
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