Novel high-temperature-resistant high-temperature alloy casting and preparation method thereof

Abstract

The invention discloses a novel high-temperature-resistant high-temperature alloy casting and a preparation method thereof, and relates to the technical field of alloy castings. Through reasonable proportioning of the elements and particularly addition of the elements such as copper, zinc, boron, manganese and titanium, the aluminum alloy die casting has excellent processability, an aluminum alloy structure with fine grains and uniform distribution is obtained, the mechanical property of the aluminum alloy is improved, and the service life of the aluminum alloy die casting is prolonged. Through cooperation of the elements, deformation of the aluminum alloy die casting and overburning caused by melting of locally-gathered low-melting-point structures are effectively avoided. In addition, a lanthanum chloride solution is used during quenching, the lanthanum element can cover the surface of the casting, fill pores and increase the content of rare earth elements in the product while the casting is rapidly cooled, so that the mechanical property and the wear resistance of the product are improved, the alloy structure phase is optimized by reacting with elements in the product through remelting heating treatment, and the wear resistance of the product is improved. And the mechanical property of the product is further improved.

Description

Technical Field

[0001] The invention relates to the technical field of alloy castings, and in particular to a new type of high-temperature resistant high-temperature alloy casting and a preparation method thereof. Background Art

[0002] Due to the light weight, high strength and good toughness of aluminum alloy, many automobile parts at home and abroad are made of aluminum alloy. Aluminum alloy is the most widely used type of non-ferrous metal structural material in industry, and has been widely used in aviation, aerospace, automobile, machinery manufacturing, shipbuilding, aluminum alloy and chemical industries. Aluminum and aluminum alloys have been widely used in marine industry, power system and aviation due to their good physical and chemical properties.

[0003] In the field of aerospace manufacturing, not only low density materials are needed, but also high heat resistance is required to meet the design requirements of engine weight reduction and increased operating temperature. In order to improve the high temperature resistance of aluminum alloys and reduce density, nickel and titanium elements are added to the alloys to effectively achieve this goal.

[0004] With the objective requirements of sustainable world economy, energy conservation, environmental protection and low-carbon development, heavy-duty gas turbines and their combined devices with advantages such as high efficiency, water saving and low carbon emissions have become the mainstream of new power generation equipment in the world. With the increase of the air inlet temperature of the ground gas turbine turbine, the turbine blade material has been severely tested. On the one hand, the material is required to have good mechanical properties and stability: on the other hand, the service environment of the blade material is complex, the fuel contains impurities such as S and Na and the erosion damage of high-temperature gas, requiring the alloy to have better resistance to high-temperature oxidation and thermal corrosion: in addition, due to the complexity of the inner cavity structure of the blade, the material is also required to have good casting performance. Existing gas turbine blade materials usually have good organizational stability and heat corrosion resistance, but they mainly have the following disadvantages: 1. The temperature bearing capacity of the material is usually low, which cannot meet the temperature bearing capacity requirements of higher-level gas turbines for blade materials: 2. In terms of the element matching of alloy design, the casting process performance is usually not taken into account. It is difficult to cast turbine blades with complex hollow structures, and it is also difficult to cast large-size blades that are prone to casting defects, thus increasing the difficulty of mass production. In order to make the alloy have high temperature bearing capacity, good heat corrosion resistance, casting process performance and structural stability, it is necessary to properly balance the chemical composition of the alloy and control it. This is the difficulty in improving the technology of gas turbine blade materials and also the technical requirement for developing more advanced industrial gas turbine high-temperature materials. Summary of the invention

[0005] The purpose of the present invention is to provide a new type of high temperature resistant high temperature alloy casting and a preparation method thereof, so as to solve the problems existing in the prior art.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: a method for preparing a high temperature resistant new high temperature alloy casting, comprising the following preparation steps:

[0007] (1) The temperature is raised to 780-810°C, pure aluminum, pure magnesium, aluminum silicon alloy, aluminum titanium alloy, electrolytic copper, aluminum boron alloy, aluminum zinc alloy, and aluminum manganese alloy are added to the vacuum furnace, heated until completely melted, cooled to 730-750°C, and a refining agent is sprayed in. After refining for 10-30 minutes, the mixture is allowed to stand for 5-10 minutes, the surface slag is scraped off, the temperature is lowered to 680-700°C, and the mixture is sent to a pressure casting device. The mixture is cast through a metal mold. The mold temperature is 220°C, the low speed is 0.1 m / s, and the high speed is 5 m / s to obtain an aluminum alloy die casting.

[0008] (2) cooling the aluminum alloy die casting in a lanthanum chloride solution to obtain a blank;

[0009] (3) The blank is returned to the furnace for heating and then discharged to obtain the finished steel casting.

[0010] Furthermore, the aluminum alloy die-casting in step (1) includes the following raw material components in weight percentage: 1.0-2.5% magnesium, 0.8-1.8% silicon, 1.2-1.9% titanium, 0.1-0.8% copper, 0.1-0.4% boron, 4.5-7.0% zinc, 0.03-0.08% manganese, 0.2% other metal and non-metal impurity elements, and the rest is aluminum.

[0011] Furthermore, the mass ratio of hexachloroethane, sodium fluoride, magnesium chloride and potassium chloride in the refining agent of step (1) is 1-10:5-10:2-8:10-20.

[0012] Furthermore, the amount of the refining agent added in step (1) is 3 to 4 kg per ton of alloy liquid.

[0013] Furthermore, in the lanthanum chloride solution of step (2), lanthanum chloride and water are mixed in a mass ratio of 1:10 to 1:15.

[0014] Furthermore, the reheating in step (3) is as follows: the temperature is raised to 610-650° C., a first heat preservation is performed, and then the temperature is lowered to 420-440° C., and a second heat preservation is performed.

[0015] Furthermore, the heating rate is 15-30°C / min.

[0016] Furthermore, the cooling rate is 3-8°C / min.

[0017] Furthermore, the first insulation time is 30 to 50 minutes.

[0018] Furthermore, the second insulation time is 1 hour.

[0019] Compared with the prior art, the beneficial effects achieved by the present invention are:

[0020] Through the reasonable proportion of elements, and the addition of copper, zinc, boron, manganese, titanium and other elements, the aluminum alloy die casting has excellent processing performance, and obtains an aluminum alloy structure with fine grains and uniform distribution, thereby improving the mechanical properties of the aluminum alloy. The coordination of elements effectively avoids deformation of the aluminum alloy die casting and melting of locally aggregated low-melting-point structures to cause overburning. In addition, the present invention uses lanthanum chloride solution in quenching. While the casting is rapidly cooled, the lanthanum element can cover the surface of the casting and fill the pores, thereby increasing the rare earth element content in the product, thereby improving the mechanical properties and wear resistance of the product, and the remelting heating treatment reacts with the elements in the product to optimize the alloy structure phase, thereby further improving the mechanical properties of the product. DETAILED DESCRIPTION

[0021] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] Example 1

[0023] (1) Heat to 784°C, add pure aluminum, pure magnesium, aluminum silicon alloy, aluminum titanium alloy, electrolytic copper, aluminum boron alloy, aluminum zinc alloy, and aluminum manganese alloy into the vacuum furnace, heat until completely melted, cool to 732°C, spray refining agent, refine for 10 minutes, let stand for 5 minutes, scrape out the surface slag, cool to 690°C, send to pressure casting equipment, pass through metal mold, cast, mold temperature is 220°C, low speed is 0.1m / s, high speed is The speed is 5m / s, and an aluminum alloy die casting is obtained; the aluminum alloy die casting comprises the following raw material components in weight percentage: 1.0% magnesium, 0.8% silicon, 1.2% titanium, 0.1% copper, 0.1% boron, 4.5% zinc, 0.03% manganese, 0.2% other metal and non-metal impurity elements, and the rest is aluminum; the mass ratio of hexachloroethane, sodium fluoride, magnesium chloride, and potassium chloride in the refining agent is 1:5:2:10, and the addition amount is 3kg / ton alloy liquid;

[0024] (2) cooling the aluminum alloy die casting in a lanthanum chloride solution to obtain a blank; wherein the lanthanum chloride solution contains lanthanum chloride and water in a mass ratio of 1:10;

[0025] (3) The blank is heated in the furnace and discharged to obtain a finished steel casting; the heating in the furnace is as follows: the temperature is raised to 610°C at a heating rate of 15°C / min, kept at this temperature for 30 minutes, and then the temperature is lowered to 420°C at a heating rate of 3°C / min, and kept at this temperature for 1 hour.

[0026] Example 2

[0027] (1) Heat to 784°C, add pure aluminum, pure magnesium, aluminum silicon alloy, aluminum titanium alloy, electrolytic copper, aluminum boron alloy, aluminum zinc alloy, and aluminum manganese alloy into the vacuum furnace, heat until completely melted, cool to 732°C, spray in refining agent, refine for 20 minutes, let stand for 5 minutes, scrape out the surface slag, cool to 690°C, send to pressure casting equipment, pass through metal mold, cast into shape, mold temperature is 220°C, low speed is 0.1m / s, high speed is The speed is 5m / s, and an aluminum alloy die casting is obtained; the aluminum alloy die casting comprises the following raw material components in weight percentage: 1.3% magnesium, 1.0% silicon, 1.4% titanium, 0.55% copper, 0.15% boron, 5.1% zinc, 0.04% manganese, 0.2% other metal and non-metal impurity elements, and the rest is aluminum; the mass ratio of hexachloroethane, sodium fluoride, magnesium chloride and potassium chloride in the refining agent is 3:6:5:15, and the addition amount is 3kg / ton alloy liquid;

[0028] (2) cooling the aluminum alloy die casting in a lanthanum chloride solution to obtain a blank; wherein the lanthanum chloride solution contains lanthanum chloride and water in a mass ratio of 1:12;

[0029] (3) The blank is heated in the furnace and discharged to obtain a finished steel casting; the heating in the furnace is as follows: the temperature is raised to 630°C at a heating rate of 20°C / min, kept at that temperature for 40 minutes, and then cooled to 430°C at a heating rate of 5°C / min, and kept at that temperature for 1 hour.

[0030] Example 3

[0031] (1) Heat to 784°C, add pure aluminum, pure magnesium, aluminum silicon alloy, aluminum titanium alloy, electrolytic copper, aluminum boron alloy, aluminum zinc alloy, and aluminum manganese alloy into the vacuum furnace, heat until completely melted, cool to 732°C, spray in refining agent, refine for 20 minutes, let stand for 7 minutes, scrape out the surface slag, cool to 690°C, send to pressure casting equipment, pass through metal mold, cast, mold temperature is 220°C, low speed is 0.1m / s, high speed is The speed is 5m / s, and an aluminum alloy die casting is obtained; the aluminum alloy die casting comprises the following raw material components in weight percentage: 1.8% magnesium, 1.3% silicon, 1.6% titanium, 0.4% copper, 0.2% boron, 5.7% zinc, 0.05% manganese, 0.2% other metal and non-metal impurity elements, and the rest is aluminum; the mass ratio of hexachloroethane, sodium fluoride, magnesium chloride, and potassium chloride in the refining agent is 5:7:5:15, and the addition amount is 3kg / ton alloy liquid;

[0032] (2) cooling the aluminum alloy die casting in a lanthanum chloride solution to obtain a blank; wherein the lanthanum chloride solution contains lanthanum chloride and water in a mass ratio of 1:12;

[0033] (3) The blank is heated in the furnace and discharged to obtain a finished steel casting; the heating in the furnace is as follows: the temperature is raised to 630°C at a heating rate of 20°C / min, kept at that temperature for 40 minutes, and then cooled to 430°C at a heating rate of 5°C / min, and kept at that temperature for 1 hour.

[0034] Example 4

[0035] (1) Heat to 784°C, add pure aluminum, pure magnesium, aluminum silicon alloy, aluminum titanium alloy, electrolytic copper, aluminum boron alloy, aluminum zinc alloy, and aluminum manganese alloy into the vacuum furnace, heat until completely melted, cool to 732°C, spray refining agent, refine for 30 minutes, let stand for 10 minutes, scrape out the surface slag, cool to 690°C, send to pressure casting equipment, pass through metal mold, cast, mold temperature is 220°C, low speed is 0.1m / s, high speed is The speed is 5m / s, and an aluminum alloy die casting is obtained; the aluminum alloy die casting comprises the following raw material components in weight percentage: 2.1% magnesium, 1.5% silicon, 1.7% titanium, 0.6% copper, 0.3% boron, 6.4% zinc, 0.07% manganese, 0.2% other metal and non-metal impurity elements, and the rest is aluminum; the mass ratio of hexachloroethane, sodium fluoride, magnesium chloride and potassium chloride in the refining agent is 10:10:8:20, and the addition amount is 3kg / ton alloy liquid;

[0036] (2) cooling the aluminum alloy die casting in a lanthanum chloride solution to obtain a blank; wherein the lanthanum chloride solution contains lanthanum chloride and water in a mass ratio of 1:15;

[0037] (3) The blank is returned to the furnace for heating and discharged to obtain a finished steel casting; the heating is carried out by heating the blank to 650°C at a heating rate of 30°C / min, keeping the temperature for 50min, then cooling the temperature to 440°C at a heating rate of 8°C / min, and keeping the temperature for 1h.

[0038] Example 5

[0039] (1) Heat to 784°C, add pure aluminum, pure magnesium, aluminum silicon alloy, aluminum titanium alloy, electrolytic copper, aluminum boron alloy, aluminum zinc alloy, and aluminum manganese alloy into the vacuum furnace, heat until completely melted, cool to 732°C, spray refining agent, refine for 30 minutes, let stand for 10 minutes, scrape out the surface slag, cool to 690°C, send to pressure casting equipment, pass through metal mold, cast, mold temperature is 220°C, low speed is 0.1m / s, high speed is The speed is 5m / s, and an aluminum alloy die casting is obtained; the aluminum alloy die casting comprises the following raw material components in weight percentage: 2.5% magnesium, 1.8% silicon, 1.9% titanium, 0.8% copper, 0.4% boron, 7.0% zinc, 0.08% manganese, 0.2% other metal and non-metal impurity elements, and the rest is aluminum; the mass ratio of hexachloroethane, sodium fluoride, magnesium chloride and potassium chloride in the refining agent is 10:10:8:20, and the addition amount is 3kg / ton alloy liquid;

[0040] (2) cooling the aluminum alloy die casting in a lanthanum chloride solution to obtain a blank; wherein the lanthanum chloride solution contains lanthanum chloride and water in a mass ratio of 1:15;

[0041] (3) The blank is returned to the furnace for heating and discharged to obtain a finished steel casting; the heating is carried out by heating the blank to 650°C at a heating rate of 30°C / min, keeping the temperature for 50min, then cooling the temperature to 440°C at a heating rate of 8°C / min, and keeping the temperature for 1h.

[0042] Effect example

[0043] Table 1 below shows the performance analysis results of the alloy castings using Examples 1 to 5 of the present invention.

[0044] Table 1

[0045]

[0046]

[0047] Through the reasonable proportion of elements, and the addition of copper, zinc, boron, manganese, titanium and other elements, the aluminum alloy die casting has excellent processing performance, and obtains an aluminum alloy structure with fine grains and uniform distribution, thereby improving the mechanical properties of the aluminum alloy. The coordination of elements effectively avoids deformation of the aluminum alloy die casting and melting of locally aggregated low-melting-point structures to cause overburning. In addition, the present invention uses lanthanum chloride solution in quenching. While the casting is rapidly cooled, the lanthanum element can cover the surface of the casting and fill the pores, thereby increasing the rare earth element content in the product, thereby improving the mechanical properties and wear resistance of the product, and the remelting heating treatment reacts with the elements in the product to optimize the alloy structure phase, thereby further improving the mechanical properties of the product.

[0048] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations within the meaning and scope of the equivalent elements of the claims be included in the invention. Any marking in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A method for preparing a new type of high temperature resistant high temperature alloy casting, characterized in that: The method comprises the following preparation steps: (1) The temperature is raised to 780-810°C, pure aluminum, pure magnesium, aluminum silicon alloy, aluminum titanium alloy, electrolytic copper, aluminum boron alloy, aluminum zinc alloy, and aluminum manganese alloy are added to the vacuum furnace, heated until completely melted, cooled to 730-750°C, and a refining agent is sprayed in. After refining for 10-30 minutes, the mixture is allowed to stand for 5-10 minutes, the surface slag is scraped off, the temperature is lowered to 680-700°C, and the mixture is sent to a pressure casting device. The mixture is cast through a metal mold. The mold temperature is 220°C, the low speed is 0.1 m / s, and the high speed is 5 m / s to obtain an aluminum alloy die casting. (2) cooling the aluminum alloy die casting in a lanthanum chloride solution to obtain a blank; (3) The blank is returned to the furnace for heating and then discharged to obtain the finished steel casting.

2. The method for preparing a high temperature resistant new high temperature alloy casting according to claim 1, characterized in that: The aluminum alloy die-casting in step (1) comprises the following raw material components in weight percentage: 1.0-2.5% magnesium, 0.8-1.8% silicon, 1.2-1.9% titanium, 0.1-0.8% copper, 0.1-0.4% boron, 4.5-7.0% zinc, 0.03-0.08% manganese, 0.2% other metal and non-metal impurity elements, and the rest is aluminum.

3. The method for preparing a high temperature resistant new high temperature alloy casting according to claim 1, characterized in that: The mass ratio of hexachloroethane, sodium fluoride, magnesium chloride and potassium chloride in the refining agent of step (1) is 1-10:5-10:2-8:10-20.

4. The method for preparing a high temperature resistant new high temperature alloy casting according to claim 1, characterized in that: The amount of refining agent added in step (1) is 3-4 kg / ton of alloy liquid.

5. The method for preparing a high temperature resistant new high temperature alloy casting according to claim 1, characterized in that: In the lanthanum chloride solution of step (2), lanthanum chloride and water are mixed in a mass ratio of 1:10 to 1:

15.

6. The method for preparing a high temperature resistant new high temperature alloy casting according to claim 1, characterized in that: The reheating in step (3) is as follows: the temperature is raised to 610-650° C., and the first heat preservation is performed; then the temperature is lowered to 420-440° C., and the second heat preservation is performed.

7. The method for preparing a high temperature resistant new type high temperature alloy casting according to claim 6, characterized in that: The heating rate is 15-30°C / min.

8. The method for preparing a high temperature resistant new high temperature alloy casting according to claim 6, characterized in that: The cooling rate is 3-8°C / min.

9. The method for preparing a high temperature resistant new high temperature alloy casting according to claim 6, characterized in that: The first insulation time is 30 to 50 minutes.

10. The method for preparing a high temperature resistant new type high temperature alloy casting according to claim 6, characterized in that: The second insulation time is 1h.

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