CN111733352A - High-strength die-casting aluminum alloy - Google Patents
High-strength die-casting aluminum alloy Download PDFInfo
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- CN111733352A CN111733352A CN202010651678.1A CN202010651678A CN111733352A CN 111733352 A CN111733352 A CN 111733352A CN 202010651678 A CN202010651678 A CN 202010651678A CN 111733352 A CN111733352 A CN 111733352A
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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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- 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
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Abstract
The invention relates to the technical field of aluminum alloy, and discloses a high-strength die-casting aluminum alloy which comprises the following components in percentage by weight: si: 3-8%, Al-Cu alloy: 1-5%, Fe: 1-2%, Al-Mn alloy: 0.5-1.5%, Mg: 0.2-0.5%, Ni: 0.2-0.5% and the balance of Al. The aluminum alloy prepared by the invention has good mechanical property, the structure property of the aluminum alloy can be greatly refined by pressure casting, the distribution is relatively uniform, the defect of large interior is avoided, the aluminum alloy has good air tightness, the problem of poor sealing property caused by small air holes generated during the work of the product is solved, the aluminum alloy has good wear resistance and good machining property, and the service life of the product is prolonged.
Description
Technical Field
The invention relates to the technical field of aluminum alloy, in particular to a high-strength die-casting aluminum alloy.
Background
Aluminum alloys are the most widely used class of non-ferrous structural materials in industry and have found a number of applications in the aerospace, automotive, mechanical manufacturing, marine and chemical industries. The rapid development of industrial economy has increased the demand for aluminum alloy welded structural members, and the research on the weldability of aluminum alloys is also deepened. Aluminum alloys are currently the most used alloys.
Aluminum alloys are widely used as industrial materials in many fields such as vehicles, civil engineering, construction, shipbuilding, chemistry, aerospace, and food; however, the existing die-casting aluminum alloy has lower strength and elongation, is easy to have the phenomenon that mechanical parts are fractured due to deformation of Shenzhen, cannot meet the working requirements of mechanical parts needing to bear larger dynamic load, and has shorter service life.
Disclosure of Invention
The invention aims to provide a high-strength die-casting aluminum alloy, which solves the problem that the die-casting aluminum alloy in the prior art is low in strength and elongation.
In order to achieve the purpose, the invention provides the following technical scheme: a high-strength die-casting aluminum alloy comprises the following components in percentage by weight: si: 3-8%, Al-Cu alloy: 1-5%, Fe: 1-2%, Al-Mn alloy: 0.5-1.5%, Mg: 0.2-0.5%, Ni: 0.2-0.5% and the balance of Al.
The method for preparing the high-strength die-casting aluminum alloy comprises the following steps of:
step one, raw material preparation: preparing raw materials according to the weight percentage, and treating oil stains and oxide layers on the surfaces of the raw materials;
step two, preheating Al, Al-Cu alloy, Al-Mn alloy and Mg to 130 ℃ at 100 ℃, and preserving heat for 0.5-1 h;
step three, adding the preheated Al, Al-Cu alloy and Al-Mn alloy into a medium-frequency induction furnace, and adding the preheated Al, Al-Cu alloy and Al-Mn alloy to the temperature of 1000-1100 ℃ until the Al, Al-Cu alloy and Al-Mn alloy are completely melted;
step four, after melting, sequentially adding Si, Fe and Ni until all the materials are melted and stirring for 0.5-1 h;
step five, cooling to 680-700 ℃, adding preheated Mg into the medium-frequency induction furnace, and standing for 6-10 min;
and step six, introducing nitrogen and a chlorine refining agent into the medium-frequency induction furnace for refining for 10-12 min.
Step seven, adding an alloy modifier into the medium-frequency induction furnace, heating to 830 ℃, and preserving heat for 8-12 min;
and step eight, casting or die-casting after the temperature in the medium-frequency induction furnace is reduced to 670-690 ℃.
Preferably, in the fourth step, if scum occurs after stirring, the scum needs to be fished out and secondary refining is carried out.
Preferably, in the sixth step, nitrogen and chlorine are introduced in a selective gas injection mode, and the refining agent is uniformly distributed in the medium-frequency induction furnace by gas injection, so that the high-speed rotation of a rotor in the medium-frequency induction furnace is facilitated to break bubbles;
preferably, in the sixth step, the purity of the nitrogen and the chlorine is more than 98%.
Preferably, in the sixth step, the refining temperature is 710-750 ℃, and the vacuum in the medium frequency induction furnace is raised to be below 0.05 MPa.
Preferably, in the seventh step, the modifier is an Al-3P master alloy modifier or an Al-Si master alloy modifier.
The high-strength die-casting aluminum alloy provided by the invention has the beneficial effects that: the aluminum alloy prepared by the invention has good mechanical property, the structure property of the aluminum alloy can be greatly refined by pressure casting, the distribution is relatively uniform, the defect of large interior is avoided, the aluminum alloy has good air tightness, the problem of poor sealing property caused by small air holes generated during the work of the product is solved, the aluminum alloy has good wear resistance and good machining property, and the service life of the product is prolonged.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention, 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.
Embodiment 1, the present invention provides a technical solution: a high-strength die-casting aluminum alloy comprises the following components in percentage by weight: si: 4%, Al-Cu alloy: 2%, Fe: 1.5%, Al-Mn alloy: 0.8%, Mg: 0.3%, Ni: 0.4 percent, and the balance of Al.
The method for preparing the high-strength die-casting aluminum alloy comprises the following steps of:
step one, raw material preparation: preparing raw materials according to the weight percentage, and treating oil stains and oxide layers on the surfaces of the raw materials; secondly, preheating Al, Al-Cu alloy, Al-Mn alloy and Mg to 115 ℃, and preserving heat for 0.8 h; adding preheated Al, Al-Cu alloy and Al-Mn alloy into a medium-frequency induction furnace, and adding the preheated Al, Al-Cu alloy and Al-Mn alloy to 1050 ℃ until the Al, Al-Cu alloy and Al-Mn alloy are completely molten; step four, after melting, sequentially adding Si, Fe and Ni until all the materials are melted, stirring for 0.7h, and if scum appears after stirring, fishing out the scum and carrying out secondary refining; step five, cooling to 690 ℃, adding preheated Mg into a medium-frequency induction furnace, and standing for 8 min; introducing nitrogen and a chlorine refining agent with the purity of more than 98% into the medium-frequency induction furnace for refining treatment for 11min, wherein the refining temperature is 730 ℃, the vacuum in the medium-frequency induction furnace is raised to be below 0.05MPa, and the gas is blown in a selected gas blowing mode to uniformly distribute the refining agent in the medium-frequency induction furnace and facilitate the high-speed rotation of a rotor in the medium-frequency induction furnace to break bubbles; step seven, adding an alloy modifier into the medium-frequency induction furnace, heating to 820 ℃, and preserving heat for 10min, wherein the modifier is an Al-3P intermediate alloy modifier; and step eight, casting or die-casting after the temperature in the medium-frequency induction furnace is reduced to 680 ℃.
Embodiment 2, the present invention provides a technical solution: a high-strength die-casting aluminum alloy comprises the following components in percentage by weight: si: 5%, Al-Cu alloy: 3%, Fe: 1.2%, Al-Mn alloy: 1.3%, Mg: 0.4%, Ni: 0.3 percent and the balance of Al.
The method for preparing the high-strength die-casting aluminum alloy comprises the following steps of:
step one, raw material preparation: preparing raw materials according to the weight percentage, and treating oil stains and oxide layers on the surfaces of the raw materials; secondly, preheating Al, Al-Cu alloy, Al-Mn alloy and Mg to 120 ℃, and preserving heat for 0.7 h; step three, adding the preheated Al, Al-Cu alloy and Al-Mn alloy into a medium-frequency induction furnace to 1060 ℃ until the Al, the Al-Cu alloy and the Al-Mn alloy are completely molten; step four, after melting, sequentially adding Si, Fe and Ni until all the materials are melted, stirring for 0.8h, and if scum appears after stirring, fishing out the scum and carrying out secondary refining; step five, cooling to 690 ℃, adding preheated Mg into a medium-frequency induction furnace, and standing for 9 min; introducing nitrogen and a chlorine refining agent with the purity of more than 98% into the medium-frequency induction furnace for refining treatment for 12min, wherein the refining temperature is 740 ℃, the vacuum in the medium-frequency induction furnace is raised to be below 0.05MPa, and the gas is blown in a selected gas blowing mode to uniformly distribute the refining agent in the medium-frequency induction furnace and facilitate the high-speed rotation of a rotor in the medium-frequency induction furnace to break bubbles; step seven, adding an alloy modifier into the medium-frequency induction furnace, heating to 815 ℃, and keeping the temperature for 11min, wherein the modifier is an Al-Si intermediate alloy modifier; and step eight, casting or die-casting after the temperature in the medium-frequency induction furnace is reduced to 690 ℃.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. A high strength die-cast aluminum alloy characterized in that: the high-strength die-casting aluminum alloy comprises the following components in percentage by weight: si: 3-8%, Al-Cu alloy: 1-5%, Fe: 1-2%, Al-Mn alloy: 0.5-1.5%, Mg: 0.2-0.5%, Ni: 0.2-0.5% and the balance of Al.
The method for preparing the high-strength die-casting aluminum alloy comprises the following steps of:
step one, raw material preparation: preparing raw materials according to the weight percentage, and treating oil stains and oxide layers on the surfaces of the raw materials;
step two, preheating Al, Al-Cu alloy, Al-Mn alloy and Mg to 130 ℃ at 100 ℃, and preserving heat for 0.5-1 h;
step three, adding the preheated Al, Al-Cu alloy and Al-Mn alloy into a medium-frequency induction furnace, and adding the preheated Al, Al-Cu alloy and Al-Mn alloy to the temperature of 1000-1100 ℃ until the Al, Al-Cu alloy and Al-Mn alloy are completely melted;
step four, after melting, sequentially adding Si, Fe and Ni until all the materials are melted and stirring for 0.5-1 h;
step five, cooling to 680-700 ℃, adding preheated Mg into the medium-frequency induction furnace, and standing for 6-10 min;
and step six, introducing nitrogen and a chlorine refining agent into the medium-frequency induction furnace for refining for 10-12 min.
Step seven, adding an alloy modifier into the medium-frequency induction furnace, heating to 830 ℃, and preserving heat for 8-12 min;
and step eight, casting or die-casting after the temperature in the medium-frequency induction furnace is reduced to 670-690 ℃.
2. The high-strength die-cast aluminum alloy according to claim 1, wherein: in the fourth step, if scum appears after stirring, the scum needs to be fished out and secondary refining is carried out.
3. The high-strength die-cast aluminum alloy according to claim 1, wherein: and sixthly, introducing nitrogen and chlorine, and adopting a selective gas injection mode, wherein the refining agent is uniformly distributed in the medium-frequency induction furnace by gas injection, and the high-speed rotation of a rotor in the medium-frequency induction furnace is facilitated to break bubbles.
4. The high-strength die-cast aluminum alloy according to claim 1, wherein: in the sixth step, the purity of the nitrogen and the chlorine is more than 98%.
5. The high-strength die-cast aluminum alloy according to claim 1, wherein: in the sixth step, the refining temperature is 710-750 ℃, and the vacuum in the medium frequency induction furnace is increased to be below 0.05 MPa.
6. The high-strength die-cast aluminum alloy according to claim 1, wherein: in the seventh step, the modifier is an Al-3P master alloy modifier or an Al-Si master alloy modifier.
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| CN202010651678.1A CN111733352B (en) | 2020-07-08 | 2020-07-08 | High-strength die-casting aluminum alloy |
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| CN202010651678.1A CN111733352B (en) | 2020-07-08 | 2020-07-08 | High-strength die-casting aluminum alloy |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6923935B1 (en) * | 2003-05-02 | 2005-08-02 | Brunswick Corporation | Hypoeutectic aluminum-silicon alloy having reduced microporosity |
| JP2006207024A (en) * | 2005-01-25 | 2006-08-10 | Brunswick Corp | Aluminum-silicon alloy having reduced microporosity |
| CN105220032A (en) * | 2015-11-11 | 2016-01-06 | 太仓海嘉车辆配件有限公司 | A kind of aluminium alloy for high strength and endurance quality support and preparation method thereof |
| CN105296819A (en) * | 2015-11-11 | 2016-02-03 | 太仓海嘉车辆配件有限公司 | High-pressure-resistant end cover aluminum alloy for dual clutch transmission system and preparation method of high-pressure-resistant end cover aluminum alloy |
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2020
- 2020-07-08 CN CN202010651678.1A patent/CN111733352B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6923935B1 (en) * | 2003-05-02 | 2005-08-02 | Brunswick Corporation | Hypoeutectic aluminum-silicon alloy having reduced microporosity |
| JP2006207024A (en) * | 2005-01-25 | 2006-08-10 | Brunswick Corp | Aluminum-silicon alloy having reduced microporosity |
| CN105220032A (en) * | 2015-11-11 | 2016-01-06 | 太仓海嘉车辆配件有限公司 | A kind of aluminium alloy for high strength and endurance quality support and preparation method thereof |
| CN105296819A (en) * | 2015-11-11 | 2016-02-03 | 太仓海嘉车辆配件有限公司 | High-pressure-resistant end cover aluminum alloy for dual clutch transmission system and preparation method of high-pressure-resistant end cover aluminum alloy |
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| CN111733352B (en) | 2021-06-11 |
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