CN110983120A - 300 MPa-grade high-strength plastic non-heat-treatment self-strengthening die-casting aluminum alloy and manufacturing method thereof - Google Patents
300 MPa-grade high-strength plastic non-heat-treatment self-strengthening die-casting aluminum alloy and manufacturing method thereof Download PDFInfo
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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
- C22C21/04—Modified aluminium-silicon alloys
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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
- B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
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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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- 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
Abstract
The invention discloses a 300 MPa-grade high-strength plastic non-heat treatment self-strengthening die-casting aluminum alloy and a manufacturing method thereof, wherein the die-casting aluminum alloy comprises the following components in percentage by mass: 7.5 to 8.5 percent of Si, 1.0 to 1.3 percent of Cu, 0.1 to 0.3 percent of Fe, 0.7 to 1.0 percent of Mn, 0.35 to 0.5 percent of Mg, 0.1 to 0.2 percent of Ti, 0.05 to 0.1 percent of Cr, 0.02 to 0.03 percent of Sr and the balance of Al. The manufacturing method comprises the following steps: remelting a pure aluminum ingot, melting other components, and uniformly stirring after completely melting the pure aluminum ingot until no sediment exists at the bottom of the pot; keeping the temperature of the molten metal at 720 ℃ for 30min, removing slag and gas, cooling the temperature of the molten metal to 680-690 ℃, and pressing pure Mg wrapped by aluminum foil into the molten aluminum by using a bell jar; after all the materials are melted, uniformly stirring for 5-10 min, and removing slag; and after smelting, adopting a cold chamber horizontal die casting machine to cast the molten alloy into a metal die to obtain an alloy casting. The tensile strength of the non-heat-treated self-reinforced die-casting aluminum alloy can reach 300MPa or above before heat treatment, the elongation is more than or equal to 8 percent, and the non-heat-treated self-reinforced die-casting aluminum alloy is a novel high-strength plastic aluminum alloy and can be popularized and used in industry.
Description
Technical Field
The invention belongs to the technical field of non-ferrous metal materials, and particularly relates to a 300 MPa-grade high-strength plastic non-heat treatment self-strengthening die-casting aluminum alloy and a manufacturing method thereof.
Background
The aluminum and the aluminum alloy have the characteristics of small density, high specific strength, good plasticity, excellent mechanical property, low thermal expansion coefficient, good corrosion resistance, excellent electrical conductivity and thermal conductivity, easy processing, recyclability and the like, are widely applied to the fields of aviation, aerospace, automobiles, mechanical manufacturing, ships, chemical industry, packaging and the like, become a type of nonferrous metal material which is most widely applied in modern industry (particularly the automobile industry), and are also green, environment-friendly and sustainable development nonferrous metal materials. The density of the aluminum alloy is only about 1/3 of that of steel, and researches show that the aluminum alloy is used for replacing low-carbon steel, cast iron or high-strength steel, the weight reduction effect of 30-60% can be realized, and the emission of greenhouse gases of 13-20 kg can be reduced when each kilogram of the aluminum alloy is used. The aluminum is used for replacing steel, which is a development trend of the automobile light weight technology, and the aluminum is more obviously used on luxury automobile models. The aluminum alloy for the automobile mainly comprises wrought aluminum alloy and cast aluminum alloy, wherein the cast aluminum alloy accounts for mainly 80% of the aluminum content of the automobile, and is mainly used for manufacturing engine cylinder bodies, cylinder covers, clutch housings, bumpers, wheels and the like, and the wrought aluminum alloy is mainly used for manufacturing automobile body covering parts, such as Audi A8 all-aluminum automobile bodies. In addition, aluminum matrix composites, foamed aluminum, and powder metallurgy aluminum alloys are also used in automotive applications. For example, the AlSi binary near eutectic aluminum-silicon alloy is suitable for manufacturing parts with complex, thin walls and relaxed force bearing requirements, such as instrument panels, guard plates, shells and the like.
Therefore, if a large amount of aluminum alloy can be used to replace part of steel parts, the weight of the product can be greatly reduced on the premise of ensuring the service performance of the product, thereby not only greatly reducing the energy consumption and saving the resources, but also reducing the emission and reducing the environmental pollution. However, the problem which has plagued this alloy for a long time is that it has low strength and poor machinability, which limits its use. Meanwhile, along with the development of the automobile manufacturing industry, higher requirements are provided for the performance of the used materials, and the development of novel aluminum alloy with high strength, high plasticity, high toughness and good processing and manufacturing performance has important research significance.
The non-heat treatment self-strengthening aluminum alloy is a novel aluminum alloy material which appears in recent years, and is characterized in that parts do not need high-temperature solution treatment and artificial aging, and can achieve higher strength and plasticity only through natural aging, thereby meeting the performance requirements of automobile and aviation parts on high-performance aluminum alloy. Through search, few documents and patents about non-heat treatment self-strengthening at home and abroad are reported, and particularly, the documents and patents about high-strength and high-plasticity non-heat treatment self-strengthening aluminum alloy are rarely reported. The Chinese patent No. CN104831129B discloses a preparation process of non-heat treatment self-strengthening aluminum-silicon alloy, wherein the tensile strength of the prepared and molded aluminum-silicon alloy is more than or equal to 270MPa at room temperature, the yield strength is more than or equal to 160MPa, the elongation is more than or equal to 6 percent, and after solution heat treatment: the tensile strength of the product cast at low pressure is more than or equal to 300MPa at room temperature, the yield strength is more than or equal to 160MPa, and the elongation is more than or equal to 5 percent. The tensile strength, yield strength and elongation of the whole material are still relatively low, and the processing requirements of high-strength industrial parts are difficult to meet.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a 300 MPa-grade high-strength plastic non-heat treatment self-strengthening die-casting aluminum alloy and a manufacturing method thereof, which solve the problems that the formed aluminum-silicon alloy in the prior art has low tensile strength, yield strength and elongation and is difficult to meet the processing requirements of high-strength industrial parts.
The purpose of the invention can be realized by the following technical scheme:
a300 MPa-grade high-strength plastic non-heat treatment self-strengthening die-casting aluminum alloy comprises the following components in percentage by mass: 7.5 to 8.5 percent of Si, 1.0 to 1.3 percent of Cu, 0.1 to 0.3 percent of Fe, 0.7 to 1.0 percent of Mn, 0.35 to 0.5 percent of Mg, 0.1 to 0.2 percent of Ti, 0.05 to 0.1 percent of Cr, 0.02 to 0.03 percent of Sr and the balance of Al;
the quality parameters of the formed aluminum alloy are as follows: the tensile strength is more than or equal to 310MPa, the yield strength is more than or equal to 190MPa, and the elongation is more than or equal to 8 percent at room temperature.
The preparation method of the 300 MPa-grade high-strength plastic non-heat treatment self-strengthening die-casting aluminum alloy is characterized by comprising the following steps of:
s1, remelting the pure aluminum ingot, and sequentially adding intermediate alloys of Al-20Si, Al-10Mn, Al-10Ti, Al-10Cr and Al-10Sr when the temperature in the furnace is raised to 730-740 ℃ until the raw materials are completely melted to obtain molten metal A;
s2, preserving the temperature of the molten metal A for 30min at the temperature of 740 ℃, then reducing the temperature of the molten metal A to 680-700 ℃, adding magnesium ingots, and obtaining molten metal B after the molten metal A is completely melted;
and S3, uniformly stirring the molten metal B for 5-10 min, heating to 720 ℃, refining for 30min, removing slag, cooling to 690 ℃, degassing for 8-10 min to obtain metal liquid C, pouring the metal liquid C into a metal mold, and molding by using injection force of 20MPa to obtain the aluminum alloy casting.
Further, the content percentage of the pure aluminum ingot in the S1 is more than or equal to 99.70%.
Further, in the step S2, the magnesium ingot is wrapped by aluminum foil and then placed in the molten metal a.
Further, the content percentage of the magnesium ingot in the S2 is more than or equal to 99.95%.
Further, after the metal liquid A in the S2 is kept warm, the metal liquid A is stirred for 8-10 min to remove slag and gas, and then the temperature is reduced to 700 ℃.
Further, the degassing in S3 is performed by: and pressing the hexachloroethane-containing degassing block into the bottom of the molten metal B by using an iron cover with holes to degas for 8-10 min until the degassing block is burnt out.
Further, in the step S3, the melting and casting are performed by pouring molten metal C into a metal mold by using a cold chamber horizontal die casting machine.
Further, before the compression casting operation in the S3, preheating a metal die to 180-200 ℃, wherein the compression casting pressure is 20 MPa.
Further, the inner surface of the metal mold in S3 is treated by spraying paint before casting.
The Al-Si alloy in the cast aluminum alloy has the most extensive application and most varieties, the Si content is generally between 4 percent and 11 percent, the Al-Si alloy has the characteristics of good fluidity, small shrinkage, good air tightness and the like, and the mechanical property, the processing property and the physical property of the Al-Si alloy are excellent after modification and heat treatment. The invention is based on Al-Si series alloy, and innovatively adopts Al-Si-Cu-Fe-Mn-Sr series alloy, thereby ensuring good die-casting process performance and low cost of the alloy system. Si is the main component for improving the fluidity of the aluminum alloy, and the best fluidity can be obtained from eutectic to hypereutectic. However, Si precipitated by crystallization is liable to form hard spots, which deteriorates machinability, and Si improves tensile strength, hardness, machinability, and strength at high temperature, which lowers elongation, and the high-silicon aluminum alloy has a serious erosion effect on the casting crucible. The addition of Si in the invention is 7.5-8.5%, which can reduce the erosion effect of aluminum alloy to the casting crucible.
The addition of Cu reacts with Si in the alloy to generate Al2Cu strengthening phases, which are all beneficial to improving the strength and the fatigue resistance of the aluminum alloy, and generate solid solution strengthening and precipitation strengthening in the alloy. The addition amount of Cu is controlled to be 1.0-1.3%, so that the serious segregation of Cu elements in the casting caused by overlarge addition amount is avoided, and the performance, particularly the plasticity of the casting is seriously reduced.
By adding Fe, most of Fe in the aluminum alloy can form Chinese character-shaped or fishbone-shaped Al in the solidification process15(Fe,Mn)3Si2(α -Fe) phase and acicular Al5The FeSi (β -Fe) phase and the iron-containing intermetallic compound are favorable for improving the high-temperature performance of the aluminum-silicon alloy, in addition, the Fe element can effectively prevent the occurrence of the mucosa phenomenon and reduce the corrosion of the aluminum alloy to a forming die in casting, and the addition amount of the Fe is controlled to be 0.1-0.3 percent in the invention, so that the alloy capacity caused by the overhigh content of the Fe can be reducedThe needle-shaped β -Fe phase is easy to form, and the needle-shaped β -Fe phase seriously cracks a matrix, so that the room-temperature mechanical property of the alloy is reduced.
The Mg is added into the high-silicon aluminum alloy, so that the strength and yield limit of the aluminum alloy can be improved, and the cutting processing performance of the aluminum alloy is improved. Magnesium is added into the Al-Si-Cu alloy to generate solid solution strengthening and precipitation strengthening, so that the strength of the aluminum-silicon alloy is effectively improved. Mg can react with Cu and Si to generate Al5Cu2Mg8Si6Phase and Al2The CuMg phase is beneficial to improving the strength of the aluminum alloy. As the casting process performance of the aluminum alloy is reduced due to the excessively high Mg addition, the strength and the plasticity are reduced at high temperature, the shrinkage rate of a casting is large during cooling, and the defects of thermal cracks, shrinkage cavities, shrinkage porosity and the like are easily generated, the Mg addition amount is controlled to be 0.35-0.5 percent, and the defects can be reduced.
The Mn is added in an amount of 0.7-1.0 percent, so that the excessive content of precipitated particles caused by the excessive Mn addition amount is reduced, and the plasticity of castings is reduced.
Addition of Cr and Ti alloying elements, the main purpose being that chromium (Cr) forms (CrFe) Al in aluminium7And (CrMn) Al12The intermetallic compounds hinder the nucleation and growth process of recrystallization, have certain strengthening effect on the alloy, and can also improve the toughness of the alloy and reduce the stress corrosion cracking sensitivity. The amount of chromium added to the aluminum alloy generally does not exceed 0.35% and decreases with increasing transition elements in the alloy. Ti is a commonly used additive element in aluminum alloys and is added in the form of Al-Ti or Al-Ti-B master alloys. Titanium and aluminum form TiAl2 phase, which becomes non-spontaneous core during crystallization, and refining casting is performedThe strength of the aluminum alloy can be improved by the structure. When the Al — Ti alloy undergoes peritectic reaction, the critical content of titanium is about 0.15%, and the reduction rate is as small as 0.01% if boron is present. Therefore, in the invention, Ti: 0.1-0.2%, Cr: 0.05 to 0.1 percent.
The addition of Sr to high-silicon wrought aluminium alloy can reduce the primary crystal to the minimum, the mechanical property is also significantly improved, the tensile strength is improved from 233MPa to 236MPa, the yield strength is improved from 204MPa to 210MPa, the elongation is increased from 9% to 12%, the addition of strontium to hypereutectic Al-Si alloy can reduce the primary crystal particle, the plasticity of the primary crystal particle is improved, the size of the primary crystal particle is improved, the hot rolling porosity of the aluminium alloy is increased from 0.02% to 0.03%, and the hot rolling porosity of the aluminium alloy is increased from 0.02% to 0.07%.
The invention has the beneficial effects that:
1. the 300 MPa-grade high-strength plastic non-heat treatment self-strengthening die-casting aluminum alloy and the manufacturing method thereof provided by the invention have the advantages that the tensile strength of the manufactured non-heat treatment self-strengthening die-casting aluminum alloy can reach 300MPa or above before heat treatment, the elongation is more than or equal to 8%, and the non-heat treatment self-strengthening die-casting aluminum alloy is a novel high-strength plastic aluminum alloy and can be popularized and used in industry.
2. The manufacturing method provided by the invention is simple to operate, can reduce the corrosion action of the aluminum alloy on the casting crucible, can increase the plasticity of the aluminum alloy, and can reduce the defects of heat crack, shrinkage cavity, shrinkage porosity and the like.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1:
the embodiment of the invention provides a 300 MPa-grade high-strength plastic non-heat treatment self-strengthening die-casting aluminum alloy, which comprises the following nominal components: 7.5%, Cu: 1.0%, Fe: 0.2%, Mn: 0.7%, Mg: 0.40%, Ti: 0.1%, Cr: 0.05%, Sr: 0.03 percent and the balance of Al (the content is the mass percentage).
The used raw materials comprise 99.70 percent (mass percentage, the same below) of industrial pure aluminum, 99.95 percent of pure magnesium and intermediate alloys of Al-20Si, Al-10Mn, Al-10Ti, Al-10Cr and Al-10Sr, and the crucible resistance furnace is adopted to smelt the alloy.
The manufacturing method of the 300 MPa-grade high-strength plastic non-heat treatment self-strengthening die-casting aluminum alloy comprises the following steps:
and S1, remelting the pure aluminum ingot, and sequentially adding intermediate alloys of Al-20Si, Al-10Mn, Al-10Ti, Al-10Cr and Al-10Sr when the temperature in the furnace is raised to 730 ℃ until the raw materials are completely melted to obtain molten metal A.
S2, preserving the temperature of the molten metal A at 740 ℃ for 30min, stirring for 8min to remove slag and gas, then cooling the temperature of the molten metal A to 700 ℃, wrapping a magnesium ingot with aluminum foil, placing the wrapped magnesium ingot in the molten metal A, and obtaining molten metal B after the magnesium ingot is completely melted.
S3, stirring the molten metal B uniformly for 8min, raising the temperature to 720 ℃, refining for 30min, fishing out floating slag on the surface of the metal B, cooling to 690 ℃, and degassing for 8-10 min (degassing method is that a degassing block containing hexachloroethane is pressed into the bottom of the metal B by using an iron cover with holes to degas for 8-10 min until the degassing block is burnt out, the same applies below), thus obtaining metal liquid C; spraying paint on the inner surface of the metal die before casting, then pouring molten metal C into the metal die by using a cold chamber horizontal die casting machine, preheating the metal die before casting to 180 ℃, and performing injection molding under the pressure of 20MPa to finally complete the die casting of the aluminum alloy casting.
The quality parameters of the formed aluminum alloy casting are as follows: tensile strength of 310MPa, yield strength of 190MPa and elongation of 10.1% at room temperature.
Example 2:
the embodiment of the invention provides a 300 MPa-grade high-strength plastic non-heat treatment self-strengthening die-casting aluminum alloy, which comprises the following nominal components: 8.5%, Cu: 1.3%, Fe: 0.3%, Mn: 0.9%, Mg: 0.35%, Ti: 0.15%, Cr: 0.08%, Sr: 0.025 percent and the balance of Al (the content is the mass percentage).
The used raw materials comprise 99.70 percent (mass percentage, the same below) of industrial pure aluminum, 99.95 percent of pure magnesium and intermediate alloys of Al-20Si, Al-10Mn, Al-10Ti, Al-10Cr and Al-10Sr, and the crucible resistance furnace is adopted to smelt the alloy.
The manufacturing method of the 300 MPa-grade high-strength plastic non-heat treatment self-strengthening die-casting aluminum alloy comprises the following steps:
and S1, remelting the pure aluminum ingot, and sequentially adding intermediate alloys of Al-20Si, Al-10Mn, Al-10Ti, Al-10Cr and Al-10Sr when the temperature in the furnace is increased to 740 ℃ until the raw materials are completely melted to obtain molten metal A.
S2, preserving the temperature of the molten metal A at 740 ℃ for 30min, stirring for 8min to remove slag and gas, then cooling the temperature of the molten metal A to 700 ℃, wrapping a magnesium ingot with aluminum foil, placing the wrapped magnesium ingot in the molten metal A, and obtaining molten metal B after the magnesium ingot is completely melted.
S3, uniformly stirring the molten metal B for 5min, raising the temperature to 720 ℃, refining for 30min, fishing out floating slag on the surface of the metal B, cooling to 680 ℃, and degassing for 8-10 min to obtain metal C; spraying paint on the inner surface of the metal die before casting, then pouring molten metal C into the metal die by using a cold chamber horizontal die casting machine, preheating the metal die before casting to 200 ℃, and performing injection molding under the pressure of 20MPa to finally complete the die casting of the aluminum alloy casting.
The quality parameters of the formed aluminum alloy casting are as follows: tensile strength 340MPa, yield strength 215MPa and elongation 8.2 percent at room temperature.
Example 3:
the embodiment of the invention provides a 300 MPa-grade high-strength plastic non-heat treatment self-strengthening die-casting aluminum alloy, which comprises the following nominal components: 8.0%, Cu: 1.2%, Fe: 0.25%, Mn: 1.0%, Mg: 0.5%, Ti: 0.2%, Cr: 0.1%, Sr: 0.02 percent and the balance of Al (the content is the mass percentage).
The used raw materials comprise 99.70 percent (mass percentage, the same below) of industrial pure aluminum, 99.95 percent of pure magnesium and intermediate alloys of Al-20Si, Al-10Mn, Al-10Ti, Al-10Cr and Al-10Sr, and the crucible resistance furnace is adopted to smelt the alloy.
The manufacturing method of the 300 MPa-grade high-strength plastic non-heat treatment self-strengthening die-casting aluminum alloy comprises the following steps:
and S1, remelting the pure aluminum ingot, and sequentially adding intermediate alloys of Al-20Si, Al-10Mn, Al-10Ti, Al-10Cr and Al-10Sr when the temperature in the furnace is raised to 730 ℃ until the raw materials are completely melted to obtain molten metal A.
S2, preserving the temperature of the molten metal A at 740 ℃ for 30min, stirring for 10min to remove slag and gas, then cooling the temperature of the molten metal A to 700 ℃, wrapping a magnesium ingot with aluminum foil, placing the wrapped magnesium ingot in the molten metal A, and obtaining molten metal B after the magnesium ingot is completely melted.
S3, uniformly stirring the molten metal B for 10min, raising the temperature to 720 ℃, refining for 30min, removing floating slag on the surface of the metal B, cooling to 690 ℃, and degassing for 8-10 min to obtain metal C; spraying paint on the inner surface of the metal die before casting, then pouring molten metal C into the metal die by using a cold chamber horizontal die casting machine, preheating the metal die before casting to 190 ℃, and performing injection molding under the pressure of 20MPa to finally complete the die casting of the aluminum alloy casting.
The quality parameters of the formed aluminum alloy casting are as follows: tensile strength at room temperature is 325MPa, yield strength is 209MPa, and elongation is 9.3%.
In conclusion, the 300 MPa-grade high-strength plastic non-heat treatment self-strengthening die-casting aluminum alloy and the manufacturing method thereof provided by the invention have the advantages that the tensile strength of the manufactured non-heat treatment self-strengthening die-casting aluminum alloy can reach 300MPa or above before heat treatment, the elongation is more than or equal to 8%, the performance of the manufactured non-heat treatment self-strengthening die-casting aluminum alloy is superior to that of aluminum alloy castings sold in the current market, and the non-heat treatment self-strengthening die-casting aluminum alloy is a novel high. Meanwhile, the corrosion of the aluminum alloy to the casting crucible can be reduced, the plasticity of the aluminum alloy is increased, the defects of thermal cracks, shrinkage cavities, shrinkage porosity and the like are reduced, and the aluminum alloy is further popularized and used in industry.
In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed.
Claims (10)
1. A300 MPa-grade high-strength plastic non-heat treatment self-strengthening die-casting aluminum alloy is characterized by comprising the following components in percentage by mass: 7.5 to 8.5 percent of Si, 1.0 to 1.3 percent of Cu, 0.1 to 0.3 percent of Fe, 0.7 to 1.0 percent of Mn, 0.35 to 0.5 percent of Mg, 0.1 to 0.2 percent of Ti, 0.05 to 0.1 percent of Cr, 0.02 to 0.03 percent of Sr and the balance of Al;
the quality parameters of the formed aluminum alloy are as follows: the tensile strength is more than or equal to 310MPa, the yield strength is more than or equal to 190MPa, and the elongation is more than or equal to 8 percent at room temperature.
2. The preparation method of the 300MPa grade high-strength plastic non-heat treatment self-strengthening die-casting aluminum alloy is characterized by comprising the following steps of:
s1, remelting the pure aluminum ingot, and sequentially adding intermediate alloys of Al-20Si, Al-10Mn, Al-10Ti, Al-10Cr and Al-10Sr when the temperature in the furnace is raised to 730-740 ℃ until the raw materials are completely melted to obtain molten metal A;
s2, preserving the temperature of the molten metal A for 30min at the temperature of 740 ℃, then reducing the temperature of the molten metal A to 680-700 ℃, adding magnesium ingots, and obtaining molten metal B after the molten metal A is completely melted;
and S3, uniformly stirring the molten metal B for 5-10 min, heating to 720 ℃, refining for 30min, removing slag, cooling to 690 ℃, degassing for 8-10 min to obtain metal liquid C, pouring the metal liquid C into a metal mold, and molding by using injection force of 20MPa to obtain the aluminum alloy casting.
3. The 300MPa grade high-strength plastic non-heat treatment self-strengthening die-casting aluminum alloy as claimed in claim 2, wherein the content percentage of pure aluminum ingots in S1 is more than or equal to 99.70%.
4. The 300MPa grade high strength plastic non-heat treatment self-strengthening die casting aluminum alloy according to claim 2, wherein the magnesium ingot in S2 is wrapped by aluminum foil and then placed in molten metal A.
5. The 300MPa grade high-strength plastic non-heat treatment self-strengthening die-casting aluminum alloy as claimed in claim 2, wherein the content percentage of the magnesium ingot in S2 is more than or equal to 99.95%.
6. The 300MPa grade high-strength plastic non-heat treatment self-strengthening die-casting aluminum alloy according to claim 2, wherein after the temperature of the molten metal A in the S2 is kept, the molten metal A is stirred for 8-10 min to remove slag and gas, and then the temperature is reduced to 700 ℃.
7. The 300MPa grade high strength plastic non-heat treated self-strengthening die cast aluminum alloy of claim 2, wherein the degassing in S3 is performed by: and pressing the hexachloroethane-containing degassing block into the bottom of the molten metal B by using an iron cover with holes to degas for 8-10 min until the degassing block is burnt out.
8. The 300MPa grade high strength plastic non-heat treatment self-reinforced pressure casting aluminum alloy according to claim 2, wherein the smelting and casting in S3 is to pour molten metal C into a metal die by using a cold chamber horizontal type pressure casting machine.
9. The 300MPa grade high-strength plastic non-heat treatment self-reinforced die-casting aluminum alloy according to claim 2, wherein before the die-casting operation in S3, a metal mold is preheated to 180-200 ℃, wherein the pressure of die-casting is 20 MPa.
10. The 300MPa grade high strength plastic non-heat treatment self-reinforced pressure casting aluminum alloy according to claim 8, wherein the inner surface of the metal mold in S3 is treated by spraying paint before casting.
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| CN112207247A (en) * | 2020-09-23 | 2021-01-12 | 浙江茸创机械制造有限公司 | Casting and heat treatment process of high-strength aluminum alloy |
| CN113373351A (en) * | 2021-06-10 | 2021-09-10 | 广东鸿图科技股份有限公司 | Pressure casting preparation method of aluminum alloy casting part capable of avoiding heat treatment |
| CN114231799A (en) * | 2021-12-10 | 2022-03-25 | 申源创(上海)新材料科技有限公司 | Non-heat-treatment high-toughness die-casting aluminum-silicon alloy and preparation method thereof |
| CN115094281A (en) * | 2022-07-08 | 2022-09-23 | 长三角先进材料研究院 | Heat treatment-free die-casting aluminum-silicon alloy capable of being baked and strengthened, preparation method and baking and strengthening method |
| CN115287506A (en) * | 2022-07-25 | 2022-11-04 | 北京科技大学 | Heat treatment-free high-strength and high-toughness cast aluminum alloy, and preparation method and application thereof |
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2019
- 2019-11-25 CN CN201911163195.0A patent/CN110983120A/en not_active Withdrawn
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| CN112176200A (en) * | 2020-09-01 | 2021-01-05 | 帅翼驰(上海)铝合金设备有限公司 | Recycling production process of aluminum die-casting waste |
| CN112207247A (en) * | 2020-09-23 | 2021-01-12 | 浙江茸创机械制造有限公司 | Casting and heat treatment process of high-strength aluminum alloy |
| CN113373351A (en) * | 2021-06-10 | 2021-09-10 | 广东鸿图科技股份有限公司 | Pressure casting preparation method of aluminum alloy casting part capable of avoiding heat treatment |
| CN114231799A (en) * | 2021-12-10 | 2022-03-25 | 申源创(上海)新材料科技有限公司 | Non-heat-treatment high-toughness die-casting aluminum-silicon alloy and preparation method thereof |
| CN114231799B (en) * | 2021-12-10 | 2022-11-22 | 申源创(上海)新材料科技有限公司 | Non-heat-treatment high-toughness die-casting aluminum-silicon alloy and preparation method thereof |
| CN115094281A (en) * | 2022-07-08 | 2022-09-23 | 长三角先进材料研究院 | Heat treatment-free die-casting aluminum-silicon alloy capable of being baked and strengthened, preparation method and baking and strengthening method |
| CN115094281B (en) * | 2022-07-08 | 2023-09-26 | 长三角先进材料研究院 | Die-casting aluminum-silicon alloy free of heat treatment and capable of being baked and strengthened, preparation method and baking and strengthening method |
| CN115287506A (en) * | 2022-07-25 | 2022-11-04 | 北京科技大学 | Heat treatment-free high-strength and high-toughness cast aluminum alloy, and preparation method and application thereof |
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