CN115323208A - Cast structural part with low hydrogen and low slag inclusion content and casting production method thereof - Google Patents
Cast structural part with low hydrogen and low slag inclusion content and casting production method thereof Download PDFInfo
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/03—Making non-ferrous alloys by melting using master alloys
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/026—Alloys based on aluminium
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- 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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- C22C21/02—Alloys based on aluminium with silicon as the next major constituent
- C22C21/04—Modified aluminium-silicon alloys
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/002—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working by rapid cooling or quenching; cooling agents used therefor
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
- C22F1/043—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon of alloys with silicon as the next major constituent
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Abstract
The invention discloses a cast structural member with low hydrogen and low slag inclusion content and a casting production method thereof, belonging to the technical field of casting. The cast structural part is a D357 or ZL114A cast structural part, and when the cast structural part is prepared, a D357 or ZL114A prefabricated aluminum ingot is firstly prepared, and then the prefabricated aluminum ingot is remelted, refined and cast to obtain the cast structural part. The hydrogen content is less than 0.06cm 3 H 2 100g, density equivalent is less than 1.0 percent; the average total area of slag inclusion with the length of more than 0.1mm is less than 1.0mm 2 Section area.
Description
Technical Field
The invention relates to the technical field of casting, in particular to a cast structural member with low hydrogen and low slag inclusion content and a casting production method thereof.
Background
Among the current aluminum-silicon materials, D357 and ZL114A have the highest tensile strength and better elongation, and are widely used in the manufacture of parts in the fields of military equipment, aerospace and the like in international manufacturing industry. At present, domestic ZL114A casting ingots only have requirements on components and pinholes in the supply market, and in the fields of military industry and aerospace, only 99.99 percent of high-purity aluminum ingots can be adopted to manufacture ZL114A prefabricated ingots in order to obtain materials and cast aluminum parts meeting aerospace standards, or a foundry automatically adopts 99.99 percent of high-purity aluminum ingots to prepare ZL114A aluminum alloy materials for casting production. The manufacturing cost of ZL114A is basically about 15000 yuan based on 00 aluminum ingots. The D357 alloy is a material which is internationally adopted and has higher performance than the national standard ZL114A, and the material is not applied at home at present. The mechanical properties of the D357 material were compared to ZL114A as shown in Table 1 and FIG. 1.
TABLE 1 mechanical Properties of D357 T6 materials compared with HB962 ZL114A T data
| D357 | ZL114A | D357 is a percentage higher than ZL114A data | |
| Rm，MPa | ≧352 | ≧300 | 17.33％ |
| Rp0.2，MPa | 290-324 | ≧220 | 31.82-47.27％ |
| A，％ | - | ≧4 | - |
Disclosure of Invention
In order to solve the problem of high cost of ZL114A materials in the fields of military equipment, aerospace and the like, a D357 material with better domestic performance is introduced; the invention aims to provide a low-hydrogen low-slag-inclusion cast structural part and a casting production method thereof, aiming at the condition that military equipment and aerospace parts have requirements on product structure strength and internal quality, and a D357 or ZL114A cast part with low H content and low slag inclusion content is obtained through component and process control, so that the purposes of reducing cost and obtaining parts with higher strength can be achieved.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a casting production method of a cast structural part with low hydrogen and low slag inclusion content comprises the following steps (1) to (4):
(1) Preparing raw materials:
prefabricating an aluminum ingot, an AlBe ingot, an Al5TiB rod, an Al10Sr rod and an Mg ingot;
(2) Remelting a prefabricated aluminum ingot:
a melting furnace is started, a crucible is preheated, meanwhile, a prefabricated aluminum ingot is added, the temperature is raised and melted, and after the prefabricated aluminum ingot is melted, the temperature is controlled to be 690-700 ℃;
(3) Refining, metamorphism and refining: when the temperature of the aluminum liquid is 690-700 ℃, adding an AlBe ingot, an Al-5Ti-B rod, an Al10Sr rod and an Mg ingot, and stirring to ensure that the components are uniform; meanwhile, refining and degassing for 15 minutes by rotating and blowing argon, and then sealing and standing for 10 minutes;
(4) And testing the hydrogen content and density of the aluminum liquid after refining, and casting after meeting the requirements to obtain the D357 or ZL114A cast structural component.
In the step (1), the prefabricated aluminum ingot is a D357 or ZL114A prefabricated aluminum ingot, and the chemical components of the D357 prefabricated aluminum ingot are as follows by weight percent: si 6.70-7.30%, mg 0.56-0.60%, ti 0.07-0.10%, be 0.05-0.07%, fe < 0.12%, cu < 0.01%, zn < 0.01%, mn/Fe = 1/2-2/3%, sn < 0.01%, P < 0.0012%, zr < 0.01%, bi < 0.001%, na < 0.0015%, pb < 0.003%, cr < 0.012%, and Al in balance;
the chemical components of the ZL114A prefabricated aluminum ingot are as follows in percentage by weight: 6.70-7.30% of Si, 0.50-0.65% of Mg0.07-0.10% of Ti, 0.05-0.07% of Be, less than 0.12% of Fe, less than 0.08% of Cu, less than 0.08% of Zn, 1/2-2/3% of Mn/Fe, less than 0.01% of Sn, less than 0.0012% of P, less than 0.15% of Zr, less than 0.001% of Bi, less than 0.0015% of Na, less than 0.003% of Pb, less than 0.012% of Cr and the balance of Al.
In the step (1), the hydrogen content in the prefabricated aluminum ingot is less than 0.10cm 3 H 2 100g, density equivalent <1.0 percent; the average total area of slag inclusion with the length of more than 0.1mm is less than 1.0mm 2 Section area.
In the step (1), the preparation process of the prefabricated aluminum ingot comprises the following steps (a) to (d):
(a) After the reflection melting furnace is ignited, pouring electrolytic pure aluminum liquid, or adding a pure aluminum ingot and melting into aluminum liquid; the purities of the electrolytic pure aluminum liquid and the pure aluminum ingot are more than or equal to 99.75 percent;
(b) Heating the aluminum liquid to 720-730 ℃, and adding metal silicon according to the component ratio; after the metallic silicon is melted, adding Al5Ti ingot according to the composition ratio at 720-730 ℃; analyzing the components of the molten metal, calculating and adding AlMn ingots with Mn content of 1/2-2/3 of Fe content according to the analysis value of Fe, wherein the adding temperature is 720-730 ℃; adjusting the temperature of the aluminum liquid to 690-700 ℃, and adding Mg ingots; when the temperature is adjusted to 690-700 ℃, adding a refining agent, and introducing nitrogen into the aluminum liquid for degassing for 30-40 minutes;
(c) After the density and the hydrogen content of the aluminum liquid are detected to meet the requirements, analyzing the components of the aluminum liquid, and supplementing magnesium to the required middle limit after the components are analyzed;
(d) Adding a slag removing agent on the surface of the aluminum liquid, and removing the scum on the surface of the aluminum liquid; and beginning to cast the aluminum ingot at 690-700 ℃ to obtain the prefabricated aluminum ingot.
In the step (3), the addition amount of the AlBe ingots is 0.04-0.07% of the weight of the aluminum liquid, the addition amount of the Al-5Ti-B rods is 0.05-0.08% of the weight of the aluminum liquid, the addition amount of the Al10Sr rods is 0.006-0.009% of the weight of the aluminum liquid, and the addition amount of the Mg ingots is 0.1% of the weight of the aluminum liquid.
In the step (4), the casting temperature is 720-730 ℃.
The cast structural part with low hydrogen and low slag inclusion content is produced by the method, the material is D357 or ZL114A material, and the D357 material comprises the following chemical components in percentage by weight: 6.50 to 7.50 percent of Si, 0.55 to 0.60 percent of Mg0.05 to 0.10 percent of Ti, 0.04 to 0.07 percent of Be, less than 0.12 percent of Fe, less than 0.01 percent of Cu, less than 0.01 percent of Zn, 1/2 to 2/3 percent of Mn/Fe, less than 0.01 percent of Sn, less than 0.0015 percent of P, less than 0.01 percent of Zr, less than 0.0015 percent of Bi, less than 0.002 percent of Na, less than 0.03 percent of Pb, less than 0.015 percent of Cr and the balance of Al;
the ZL114A material comprises the following chemical components in percentage by weight: 6.50 to 7.50 percent of Si, 0.45 to 0.75 percent of Mg, 0.05 to 0.10 percent of Ti, 0.04 to 0.07 percent of Be, less than 0.12 percent of Fe, less than 0.10 percent of Cu, less than 0.10 percent of Zn, 1/2 to 2/3 percent of Mn/Fe, less than 0.01 percent of Sn, less than 0.0015 percent of P, less than 0.2 percent of Zr, less than 0.0015 percent of Bi, less than 0.002 percent of Na, less than 0.03 percent of Pb, less than 0.015 percent of Cr and the balance of Al.
The content of hydrogen in the cast structural member is less than 0.06cm 3 H 2 100g, density equivalent is less than 1.0 percent.
The cast structure has uniform fracture structure of the cast ingot and fine crystal grains; the average total area of slag inclusion with the length of more than 0.1mm is less than 1.0mm 2 Section area.
The invention has the following beneficial effects:
1. aiming at the characteristics of high requirements of parts in the fields of military equipment and aerospace on aluminum alloy ingot casting materials, the invention ensures that the produced D357 or ZL114A parts (such as a casing, a cabin door and the like) completely meet the design quality requirements through a specific D357 or ZL114A prefabricated aluminum ingot preparation process and a casting part preparation process.
2. Firstly, preparing prefabricated D357 or ZL114A aluminum ingot, and controlling the components and the process to ensure that the hydrogen content in the prefabricated ingot is less than 0.10cm 3 H 2 100g, density equivalent is less than 1.0 percent; the average total area of slag inclusion with the length of more than 0.1mm is less than 1.0mm 2 Section (c). Further casting the cast product from the precast ingot, and controlling the components and the process to ensure that the hydrogen content of the final D357 or ZL114A cast part product is less than 0.06cm 3 H 2 100g, density equivalent less than 1.0 percent, and average total area of slag inclusion with length more than 0.1mm less than 1.0mm 2 Section area. Can meet the use requirements of military equipment and aerospace parts.
3. The production cost of the ZL114A material can be reduced by 2/3.
4. The D357 material and the casting with higher mechanical property index can be obtained, and a better choice can be provided for the design and manufacture of parts in the fields of domestic war industry and aerospace.
Drawings
FIG. 1 is a graph comparing the mechanical properties of D357T 6 material with those of HB962 ZL114A T.
Fig. 2 shows the structure of parts of the casing prepared in example 1.
FIG. 3 is a photograph of a fracture of a prefabricated aluminum ingot prepared in example 1 and a photograph of a fracture of a rejected prefabricated aluminum ingot; wherein: (a) example 1; (b) failing to fracture.
Figure 4 shows the part structure of the ZL114A aircraft spoiler actuator prepared in example 2.
FIG. 5 shows a D357 structure of a door part of an airplane prepared in example 3.
Detailed Description
For a further understanding of the present invention, the following description is given in conjunction with the examples which are set forth to illustrate, but are not to be construed to limit the present invention, features and advantages.
The invention provides a preparation process of a D357 or ZL114A cast part, which comprises the steps of firstly preparing a D357 or ZL114A prefabricated aluminum ingot and then preparing a corresponding D357 or ZL114A cast part by adopting the prefabricated aluminum ingot. The following examples were prepared as follows:
1. preparing a D357 or ZL114A prefabricated aluminum ingot by the following process:
(1) Preparing raw materials according to chemical components of a prefabricated aluminum ingot: electrolytic aluminum solution or pure aluminum ingot (purity is more than or equal to 99.75%), metallic silicon, alBe alloy ingot, al5Ti alloy ingot, aluminum-manganese alloy and the like. The chemical composition of the D357 precast aluminum ingot is as follows (wt.%): si 6.70-7.30%, mg 0.56-0.60%, ti 0.07-0.10%, be 0.05-0.07%, fe < 0.12%, cu < 0.01%, zn < 0.01%, mn/Fe = 1/2-2/3%, sn < 0.01%, P < 0.0012%, zr < 0.01%, bi < 0.001%, na < 0.0015%, pb < 0.003%, cr < 0.012%, and Al in balance; the total content of other impurities (Hg, cd, ni, B, li, be, V, ga, etc.) is less than 0.09%.
The chemical composition (wt.%) of the ZL114A preform aluminum ingot is: 6.70 to 7.30 percent of Si, 0.50 to 0.65 percent of Mg, 0.07 to 0.10 percent of Ti, 0.05 to 0.07 percent of Be, less than 0.12 percent of Fe, less than 0.08 percent of Cu, less than 0.08 percent of Zn, 1/2 to 2/3 percent of Mn/Fe, less than 0.01 percent of Sn, less than 0.0012 percent of P, less than 0.15 percent of Zr, less than 0.001 percent of Bi, less than 0.0015 percent of Na, less than 0.003 percent of Pb, less than 0.012 percent of Cr and the balance of Al.
(2) After the reflection melting furnace is ignited, pouring electrolytic pure aluminum liquid, or adding a pure aluminum ingot (00 pure aluminum ingot) and melting into aluminum liquid;
(3) Heating the aluminum liquid to 725 ℃, and adding metal silicon; after the metal silicon is melted, adding an AlBe alloy ingot and an Al5Ti alloy ingot at 725 ℃; analyzing the components of the alloy liquid, calculating and adding AlMn alloy with Mn content of 1/2-2/3 of Fe content according to the analysis value of Fe, wherein the adding temperature is 725 ℃;
(4) Adjusting the temperature of the aluminum liquid to 695 ℃, and adding an Mg ingot; then adding a proper amount of conventional aluminum alloy refining agent at 695 ℃, and introducing nitrogen with the purity of 99.99% into the aluminum liquid for degassing for 30-40 minutes;
(5) Testing the density on a density equivalent instrument; testing the hydrogen content of the aluminum liquid by using a hydrogen tester; taking component samples, and supplementing magnesium to the required middle limit after analyzing the components; then adding a slag removing agent on the surface of the aluminum liquid, and fishing out scum on the surface of the aluminum liquid;
(6) Opening a tapping hole of the furnace body, and beginning to cast aluminum ingots, wherein the casting temperature is controlled at 695 ℃; filtering the alloy liquid before pouring, and then forming into a prefabricated aluminum ingot.
During the preparation process, the composition, density equivalent and area of the fracture oxide of the material are monitored at the early, middle and late stages.
The prepared prefabricated aluminum ingot has the following requirements: hydrogen content < 0.10cm 3 H 2 100g, density equivalent less than 1.0%; the average total area of slag inclusion with the length of more than 0.1mm is less than 1.0mm 2 Section (c).
2. Preparation of D357 or ZL114A cast parts:
(1) Preparing raw materials:
d357 or ZL114A prefabricated aluminum ingot; an AlBe alloy ingot, an Al5TiB alloy rod, an Al10Sr alloy rod, an Mg ingot and a deslagging agent; before use, pre-cast ingots, alBe alloy ingots, al5TiB alloy rods, al10Sr alloy rods, mg ingots and slag removing agents are placed beside a furnace for preheating, the ingots are lightly taken and placed, and furnace burden is strictly forbidden to be thrown.
(2) Remelting a prefabricated aluminum ingot:
opening a melting furnace, preheating a crucible, and simultaneously adding a prefabricated aluminum ingot, wherein the aluminum ingot slides into the bottom of the crucible along the wall of the crucible; heating and melting, wherein in the melting process, the scum on the surface of the melt is continuously skimmed; after the aluminum ingot is melted, controlling the temperature at 725 ℃;
(3) Alloying, refining and modifying: when the temperature of the aluminum liquid is 725 ℃, adding an AlBe alloy ingot, an Al-5Ti-B alloy rod and an Al10Sr alloy rod, and stirring to ensure that the components are uniform; wherein: the adding amount of the AlBe alloy ingot is 0.04-0.07% of the weight of the aluminum liquid, the adding amount of the Al-5Ti-B alloy rod is 0.05-0.08% of the weight of the aluminum liquid, and the adding amount of the Al10Sr alloy rod accounts for 0.006-0.009% of the weight of the aluminum liquid;
(4) Degassing and refining: adjusting the temperature of the aluminum liquid to 695 ℃, adding Mg ingots accounting for 0.1 percent of the weight of the aluminum liquid, simultaneously carrying out rotary blowing, refining and degassing for 15 minutes by argon, then covering a cover and standing for 10 minutes, brushing zinc oxide coating on the inner surface of the cover, and if standing for a long time, introducing a little argon into the cover;
(5) And testing the hydrogen content and density of the aluminum liquid after refining, and pouring at 725 ℃ after meeting the requirements to obtain the D357 or ZL114A cast structural part.
(6) Heat treatment, the heat treatment system is as follows: solution treatment: quenching in water at 543 + -3 deg.C, 10h,60-90 deg.C; and (3) aging treatment: 175 plus or minus 5 ℃ for 2 to 10 hours.
The chemical composition of the prepared D357 cast part is (wt.%): 6.50 to 7.50 percent of Si, 0.55 to 0.60 percent of Mg, 0.05 to 0.10 percent of Ti, 0.04 to 0.07 percent of Be, less than 0.12 percent of Fe, less than 0.01 percent of Cu, less than 0.01 percent of Zn, 1/2 to 2/3 percent of Mn/Fe, less than 0.01 percent of Sn, less than 0.0015 percent of P, less than 0.01 percent of Zr, less than 0.0015 percent of Bi, less than 0.002 percent of Na, less than 0.03 percent of Pb, less than 0.015 percent of Cr and the balance of Al; the total content of other impurities (Hg, cd, ni, B, li, be, V, ga, etc.) is less than 0.1%.
The chemical composition of the prepared ZL114A cast part is (wt.%): 6.50 to 7.50 percent of Si, 0.45 to 0.75 percent of Mg, 0.05 to 0.10 percent of Ti, 0.04 to 0.07 percent of Be, less than 0.12 percent of Fe, less than 0.10 percent of Cu, less than 0.10 percent of Zn, 1/2 to 2/3 percent of Mn/Fe, less than 0.01 percent of Sn, less than 0.0015 percent of P, less than 0.2 percent of Zr, less than 0.0015 percent of Bi, less than 0.002 percent of Na, less than 0.03 percent of Pb, less than 0.015 percent of Cr and the balance of Al; the total content of other impurities (Hg, cd, ni, B, li, be, V, ga, etc.) is less than 0.1%.
The prepared casting part requires: hydrogen content less than 0.06cm 3 H 2 100g, density equivalent less than 1.0 percent, and average total area of slag inclusion with length more than 0.1mm less than 1.0mm 2 Section (c).
Example 1:
in this example, an ingot of ZL114A preform was first prepared, and then a certain casing part was prepared from the ingot, and the structure of the part is shown in FIG. 2.
The method comprises the following steps of taking 5 finished ingots before, in and at the later stage of casting of the prefabricated aluminum ingot, and taking a fracture for inspection at 1/3 and 2/3 positions of each ingot, wherein the inspection result is as follows:
(1) The fracture tissue is uniform and the crystal grains are fine;
(2) Shrinkage zone loose tissue without white layer (aluminum hydroxide) tissue;
(3) Average total area of slag inclusion with length of more than 0.1 mm: 1.0mm 2 Section;
(4) The photographs of the fractures are shown in FIG. 3.
Taking 1 finished ingot before, during and after casting, and detecting the metallographic structure result: the alpha aluminum is fine and uniform.
The design chemical composition/measured value of the casing part produced by using the prefabricated aluminum ingot is shown in table 2, and the hydrogen content/density equivalent/fracture inspection is shown in table 3; the mechanical properties of the castings are tested after the castings are subjected to heat treatment, and the heat treatment system is as follows: solution treatment: quenching in water at 543 +/-3 ℃, 10h and 75 ℃; aging treatment: 175 + -5 deg.C, 5 hours. The mechanical properties of the product are shown in Table 4.
Table 2 ZL114A cast part chemistry (wt.%)
TABLE 3 ZL114A cast parts Hydrogen content/Density equivalent/slag inclusions
TABLE 4 mechanical Properties of ZL114A cast parts
Example 2:
in this example, an airplane spoiler actuator part was prepared by first preparing ZL114A prefabricated aluminum ingots, and then using ZL114A prefabricated aluminum ingots (the components are shown in table 5), and the structure of the part is shown in fig. 4.
The design chemical composition/measured value of the produced aircraft spoiler actuator part is shown in table 5, and the hydrogen content/density equivalent/fracture inspection thereof is shown in table 6; the mechanical properties of the castings are tested after heat treatment, and the heat treatment system is as follows: solution treatment: quenching in water at 543 + -3 deg.C, 10h and 75 deg.C; aging treatment: 175 + -5 deg.C for 5 hours. The mechanical properties of the product are shown in Table 7.
TABLE 5 ZL114A cast part chemistry (wt.%)
TABLE 6 ZL114A cast parts Hydrogen content/Density equivalent/slag inclusions
TABLE 7 mechanical Properties of ZL114A cast parts
Example 3:
in this embodiment, a D357 prefabricated aluminum ingot is prepared first, and then a D357 prefabricated aluminum ingot is used to prepare a cabin door part of an airplane, where the structure of the part is shown in fig. 5.
The aircraft door parts produced were designed with the chemical compositions/measured values shown in table 8 and the hydrogen content/density equivalent/fracture checks shown in table 90; the mechanical properties of the castings are tested after the castings are subjected to heat treatment, and the heat treatment system is as follows: solution treatment: quenching in water at 543 + -3 deg.C, 10h and 75 deg.C; aging treatment: 175 + -5 deg.C for 5 hours. The mechanical properties of the product are shown in Table 10.
Table 8 d357 cast part chemistry (wt.%)
TABLE 9 D357 cast part Hydrogen content/Density equivalent/slag inclusions
TABLE 10 D357 mechanical Properties of cast parts
Claims (9)
1. A casting production method of a cast structural member with low hydrogen and low slag inclusion content is characterized in that: the method comprises the following steps:
(1) Preparing raw materials:
prefabricating an aluminum ingot, an AlBe ingot, an Al5TiB rod, an Al10Sr rod, an Mg ingot and a slag former;
(2) Remelting a prefabricated aluminum ingot:
opening a melting furnace, preheating a crucible, adding a prefabricated aluminum ingot, heating to melt, and controlling the temperature to be 690-700 ℃ after the prefabricated aluminum ingot is melted;
(3) Refining, metamorphism and refining: when the temperature of the aluminum liquid is 690-700 ℃, adding an AlBe rod, an Al-5Ti-B rod, an Al10Sr rod and an Mg ingot, and stirring to ensure that the components are uniform; meanwhile, refining and degassing for 15 minutes by rotating and blowing argon, and then sealing and standing for 10 minutes;
(4) And testing the hydrogen content and density of the aluminum liquid after refining, and casting after meeting the requirements to obtain the D357 or ZL114A cast structural member.
2. The method of cast production of a low hydrogen, low slag inclusion cast structural member of claim 1, wherein: in the step (1), the prefabricated aluminum ingot is a D357 or ZL114A prefabricated aluminum ingot, and the D357 prefabricated aluminum ingot comprises the following chemical components in percentage by weight: si 6.70-7.30%, mg 0.56-0.60%, ti0.07-0.10%, be 0.05-0.07%, fe < 0.12%, cu < 0.01%, zn < 0.01%, mn/Fe = 1/2-2/3%, sn < 0.01%, P < 0.0012%, zr < 0.01%, bi < 0.001%, na < 0.0015%, pb < 0.003%, cr < 0.012%, and Al in balance;
the chemical components of the ZL114A prefabricated aluminum ingot are as follows in percentage by weight: 6.70-7.30% of Si, 0.50-0.65% of Mg0.07-0.10% of Ti, 0.05-0.07% of Be, less than 0.12% of Fe, less than 0.08% of Cu, less than 0.08% of Zn, 1/2-2/3% of Mn/Fe, less than 0.01% of Sn, less than 0.0012% of P, less than 0.15% of Zr, less than 0.001% of Bi, less than 0.0015% of Na, less than 0.003% of Pb, less than 0.012% of Cr and the balance of Al.
3. The method of cast production of a low hydrogen, low slag inclusion cast structural member of claim 1, wherein: in the step (1), the hydrogen content in the prefabricated aluminum ingot is less than 0.10cm 3 H 2 100g, density equivalent less than 1.0%; the average total area of slag inclusion with the length of more than 0.1mm is less than 1.0mm 2 Section (c).
4. The method of cast production of a low hydrogen, low slag inclusion cast structural member of claim 1, wherein: in the step (1), the preparation process of the prefabricated aluminum ingot comprises the following steps (a) to (d):
(a) After the reflection melting furnace is ignited, pouring electrolytic pure aluminum liquid, or adding a pure aluminum ingot and melting into aluminum liquid; the purities of the electrolytic pure aluminum liquid and the pure aluminum ingot are more than or equal to 99.75 percent;
(b) Heating the aluminum liquid to 720-730 ℃, and adding metal silicon according to the component ratio; after the metal silicon is melted, adding AlBe and Al5Ti ingots according to the component proportion at 720-730 ℃; analyzing the components of the molten metal, calculating and adding AlMn ingots with Mn content of 1/2-2/3 of Fe content according to the analysis value of Fe, wherein the adding temperature is 720-730 ℃; adjusting the temperature of the aluminum liquid to 690-700 ℃, and adding Mg ingots; when the temperature is adjusted to 690-700 ℃, adding a refining agent, and introducing nitrogen into the aluminum liquid for degassing for 30-40 minutes;
(c) After the density and the hydrogen content of the aluminum liquid are detected to meet the requirements, analyzing the components of the aluminum liquid, and supplementing magnesium to the required middle limit after the components are analyzed;
(d) Adding a slag removing agent on the surface of the aluminum liquid, and removing the scum on the surface of the aluminum liquid; and beginning to cast the aluminum ingot at 690-700 ℃ to obtain the prefabricated aluminum ingot.
5. The method of cast production of a low hydrogen, low slag inclusion cast structural member of claim 1, wherein: in the step (3), the adding amount of the AlBe ingots is 0.04-0.07% of the weight of the aluminum liquid, the adding amount of the Al-5Ti-B rods is 0.05-0.08% of the weight of the aluminum liquid, the adding amount of the Al10Sr rods is 0.006-0.009% of the weight of the aluminum liquid, and the adding amount of the Mg ingots is 0.1% of the weight of the aluminum liquid.
6. The method of cast production of a low hydrogen, low slag inclusion cast structural member of claim 4, wherein: in the step (4), the pouring temperature is 720-730 ℃.
7. A low hydrogen, low slag inclusion cast structural member produced by the method of any one of claims 1 to 6, wherein: the cast structural part is a D357 or ZL114A cast structural part, and the D357 cast structural part comprises the following chemical components in percentage by weight: 6.50 to 7.50 percent of Si, 0.55 to 0.60 percent of Mg, 0.05 to 0.10 percent of Ti, 0.04 to 0.07 percent of Be, less than 0.12 percent of Fe, less than 0.01 percent of Cu, less than 0.01 percent of Zn, 1/2 to 2/3 percent of Mn/Fe, less than 0.01 percent of Sn, less than 0.0015 percent of P, less than 0.01 percent of Zr, less than 0.0015 percent of Bi, less than 0.002 percent of Na, less than 0.03 percent of Pb, less than 0.015 percent of Cr and the balance of Al;
the chemical components of the ZL114A cast structural component comprise the following components in percentage by weight: 6.50 to 7.50 percent of Si, 0.45 to 0.75 percent of Mg0.05 to 0.10 percent of Ti, 0.04 to 0.07 percent of Be, less than 0.12 percent of Fe, less than 0.10 percent of Cu, less than 0.10 percent of Zn, 1/2 to 2/3 percent of Mn/Fe, less than 0.01 percent of Sn, less than 0.0015 percent of P, less than 0.2 percent of Zr, less than 0.0015 percent of Bi, less than 0.002 percent of Na, less than 0.03 percent of Pb, less than 0.015 percent of Cr and the balance of Al.
8. The low hydrogen, low slag inclusion cast structure of claim 7, wherein: in the cast structural member, the hydrogen content is less than 0.06cm 3 H 2 100g, density equivalent is less than 1.0 percent.
9. The low hydrogen, low slag inclusion cast structure of claim 7, wherein: the cast structure has uniform fracture structure of the cast ingot and fine crystal grains; the average total area of slag inclusion with the length of more than 0.1mm is less than 1.0mm 2 Section area.
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