CN117564231A - AQ80M magnesium alloy oversized ingot blank and preparation method and application thereof - Google Patents
AQ80M magnesium alloy oversized ingot blank and preparation method and application thereof Download PDFInfo
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- CN117564231A CN117564231A CN202311380854.2A CN202311380854A CN117564231A CN 117564231 A CN117564231 A CN 117564231A CN 202311380854 A CN202311380854 A CN 202311380854A CN 117564231 A CN117564231 A CN 117564231A
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- 229910000861 Mg alloy Inorganic materials 0.000 title claims abstract description 99
- 238000002360 preparation method Methods 0.000 title claims abstract description 28
- 238000009749 continuous casting Methods 0.000 claims abstract description 98
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 63
- 239000000956 alloy Substances 0.000 claims abstract description 63
- 238000007670 refining Methods 0.000 claims abstract description 58
- 239000000498 cooling water Substances 0.000 claims abstract description 27
- 230000005672 electromagnetic field Effects 0.000 claims abstract description 26
- 239000002893 slag Substances 0.000 claims abstract description 23
- 239000002994 raw material Substances 0.000 claims abstract description 19
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 34
- 238000000034 method Methods 0.000 claims description 31
- 239000011777 magnesium Substances 0.000 claims description 25
- 238000002844 melting Methods 0.000 claims description 25
- 230000008018 melting Effects 0.000 claims description 25
- 238000003756 stirring Methods 0.000 claims description 23
- 229910052786 argon Inorganic materials 0.000 claims description 17
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 15
- 229910052749 magnesium Inorganic materials 0.000 claims description 15
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 12
- 229910052782 aluminium Inorganic materials 0.000 claims description 12
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 12
- 239000000155 melt Substances 0.000 claims description 12
- 229910052709 silver Inorganic materials 0.000 claims description 11
- 230000005284 excitation Effects 0.000 claims description 8
- 239000002245 particle Substances 0.000 claims description 8
- 239000004332 silver Substances 0.000 claims description 6
- 229910052725 zinc Inorganic materials 0.000 claims description 6
- 239000011701 zinc Substances 0.000 claims description 6
- 230000007123 defense Effects 0.000 claims description 5
- 229910052748 manganese Inorganic materials 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 3
- 239000003795 chemical substances by application Substances 0.000 description 20
- 230000008569 process Effects 0.000 description 19
- 238000001816 cooling Methods 0.000 description 10
- 238000005266 casting Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 8
- 239000007788 liquid Substances 0.000 description 8
- 238000005070 sampling Methods 0.000 description 8
- 238000005336 cracking Methods 0.000 description 7
- 238000010438 heat treatment Methods 0.000 description 6
- 230000007547 defect Effects 0.000 description 5
- 229910052742 iron Inorganic materials 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 2
- 238000002425 crystallisation Methods 0.000 description 2
- 230000008025 crystallization Effects 0.000 description 2
- 238000004880 explosion Methods 0.000 description 2
- 238000007667 floating Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- 230000007480 spreading Effects 0.000 description 1
- 239000011232 storage material Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
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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
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/001—Continuous casting of metals, i.e. casting in indefinite lengths of specific alloys
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/03—Making non-ferrous alloys by melting using master alloys
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C23/00—Alloys based on magnesium
- C22C23/02—Alloys based on magnesium with aluminium as the next major constituent
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Continuous Casting (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention provides an AQ80M magnesium alloy oversized ingot blank and a preparation method and application thereof, and belongs to the field of magnesium alloy semi-continuous casting. The invention sequentially carries out slag skimming and refining after the alloy raw materials are melted, and then carries out semi-continuous casting to obtain an AQ80M magnesium alloy oversized ingot blank; the semi-continuous casting is one-section semi-continuous casting and two-section semi-continuous casting; parameters of the semi-continuous casting include: the temperature is 640-660 ℃, the frequency of the electromagnetic field is 10-20 HZ, the low-frequency current is 80-100 mA, the ingot pulling speed is 10-20 mm/min, and the cooling water strength is 25-38 m 3 /h; parameters for the two-stage semi-continuous casting include: the temperature is 640-660 ℃, the frequency of the electromagnetic field is 15-25 HZ, the low-frequency current is 90-120 mA, the ingot pulling speed is 20-35 mm/min, and the cooling water strength is 38-50 m 3 /h。
Description
Technical Field
The invention relates to the field of magnesium alloy semi-continuous casting, in particular to an AQ80M magnesium alloy oversized ingot blank, a preparation method and application thereof.
Background
The magnesium alloy is the lightest metal structural material in the actual application at present, has the advantages of high specific strength, high specific rigidity, good damping performance, electromagnetic shielding performance and the like, and is widely applied to the fields of aerospace, national defense and military industry, transportation and the like. The AQ80M magnesium alloy is a medium-strength heat-resistant magnesium alloy, and the high-temperature mechanical property of the magnesium alloy is improved by adding a proper amount of Ag and RE elements, and the heat-resistant temperature reaches 150 ℃. High-quality ingot casting is the most important step for ensuring the quality of structural member products prepared by subsequent processing (forging, extrusion, rolling and the like), and deforming magnesium alloy is mainly adopted to produce ingot blanks by adopting a semi-continuous casting technology at present.
According to the document search of the prior art, the Chinese patent number ZL201710180011.6 (the name of the invention: an electromagnetic semi-continuous casting process of an AQ80M magnesium alloy large ingot blank) discloses an electromagnetic semi-continuous casting process of the AQ80M magnesium alloy large ingot blank, and the diameter of the ingot blank can be 300-650mm by the method. Along with the increasing demands of the fields of aerospace, national defense and military industry and the like on large-size structural members, the magnesium alloy ingot blank with the diameter of 300-650mm does not meet the demands of the larger-size structural members in the fields of aerospace, national defense and military industry. The existing AQ80M magnesium alloy oversized ingot blank with the diameter of 650-800 mm is not reported, and is mainly due to the preparation problems of easiness in cracking, cold insulation depth and the like when the AQ80M magnesium alloy ingot blank with the diameter of 650-800 mm is produced by the traditional semi-continuous casting process, and the preparation difficulty is high.
Therefore, the preparation process of the high-quality AQ80M magnesium alloy oversized ingot with the diameter of 650-800 mm is provided, and the technical problem to be solved in the field is urgent.
Disclosure of Invention
The invention aims to provide an AQ80M magnesium alloy oversized ingot blank, and a preparation method and application thereof, and the preparation method provided by the invention can obtain the high-quality AQ80M magnesium alloy oversized ingot blank with the diameter of 650-800 mm, the length of 1500-4500 mm, stable and uniform components, smooth surface and no internal cracks.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides a preparation method of an AQ80M magnesium alloy oversized ingot blank, which comprises the following steps:
(1) Sequentially carrying out slag skimming and refining after the alloy raw materials are melted to obtain alloy melt;
(2) Performing semi-continuous casting on the alloy melt obtained in the step (1) to obtain an AQ80M magnesium alloy oversized ingot blank;
the semi-continuous casting comprises a first-stage semi-continuous casting and a second-stage semi-continuous casting which are sequentially carried out;
the parameters of the one-stage semi-continuous casting include: the temperature is 640-660 ℃, the frequency of the electromagnetic field is 10-20 HZ, the low-frequency current is 80-100 mA, the ingot pulling speed is 10-20 mm/min, and the cooling water strength is 25-38 m 3 /h; the length of the ingot obtained by the semi-continuous casting of the section is 100-500 mm;
the parameters of the two-stage semi-continuous casting include: the temperature is 640-660 ℃, the frequency of the electromagnetic field is 15-25 HZ, the low-frequency current is 90-120 mA, the ingot pulling speed is 20-35 mm/min, and the cooling water strength is 38-50 m 3 /h; the diameter of the AQ80M magnesium alloy oversized ingot blank is 650-800 mm.
Preferably, the alloy raw material in the step (1) comprises high-purity magnesium ingots, high-purity aluminum ingots, high-purity zinc ingots and MnCl 2 Particles, mg-RE intermediate alloy, mg-Ca intermediateAlloys and high purity silver.
Preferably, the melting in the step (1) is as follows: firstly, melting a high-purity magnesium ingot, and then sequentially adding a high-purity aluminum ingot, a high-purity zinc ingot and MnCl 2 Particles, mg-RE master alloys, mg-Ca master alloys and high purity silver.
Preferably, the refining temperature in the step (1) is 700-780 ℃, and the refining time is 5-20 min.
Preferably, in the step (1), argon is introduced into the bottom of the melt for stirring and refining.
Preferably, the semi-continuous casting in step (2) is performed in a crystallizer equipped with an excitation coil.
Preferably, the semi-continuous casting atmosphere in the step (2) is SF 6 +CO 2 And (5) mixing the atmosphere.
Preferably, the components of the oversized AQ80M magnesium alloy ingot blank in the step (2) are as follows in percentage by mass: al:7.5 to 9.0 percent of Ag:0.02 to 0.80 percent of Zn:0.35 to 0.55 percent of Mn:0.05 to 0.30 percent of RE:0.01 to 0.10 percent of Ca: 0.001-0.020%, fe less than or equal to 0.02%, si less than or equal to 0.05%, cu less than or equal to 0.02%, ni less than or equal to 0.001% and the balance Mg.
The invention provides the AQ80M magnesium alloy oversized ingot blank prepared by the preparation method.
The invention provides application of the AQ80M magnesium alloy oversized ingot blank in the fields of aerospace, national defense, military industry and transportation.
The invention provides a preparation method of an AQ80M magnesium alloy oversized ingot blank, which comprises the following steps:
(1) Sequentially carrying out slag skimming and refining after the alloy raw materials are melted to obtain alloy melt; (2) Performing semi-continuous casting on the alloy melt obtained in the step (1) to obtain an AQ80M magnesium alloy oversized ingot blank; the semi-continuous casting comprises a first-stage semi-continuous casting and a second-stage semi-continuous casting which are sequentially carried out; the parameters of the one-stage semi-continuous casting include: the temperature is 640-660 ℃, the frequency of the electromagnetic field is 10-20 HZ, the low-frequency current is 80-100 mA, the ingot pulling speed is 10-20 mm/min, and the cooling water strength is 25-38 m 3 /h; the length of the ingot obtained by the semi-continuous casting of the section is 100-500 mm; the parameters of the two-stage semi-continuous casting include: the temperature is 640-660 ℃, the frequency of the electromagnetic field is 15-25 HZ, the low-frequency current is 90-120 mA, the ingot pulling speed is 20-35 mm/min, and the cooling water strength is 38-50 m 3 /h; the diameter of the AQ80M magnesium alloy oversized ingot blank is 650-800 mm. According to the invention, the electromagnetic field is introduced to reduce the transverse temperature gradient from the side part to the core part during solidification and crystallization of the melt, so that the flow of the magnesium solution is improved, and the depth of a liquid cavity is reduced; through the control of inclusions, full stirring, and the regulation and reasonable collocation of the ranges of electromagnetic frequency, low-frequency current, casting temperature, ingot pulling speed and cooling water strength, the high-quality AQ80M magnesium alloy oversized ingot blank with the diameter of 650-800 mm, the length of 1500-4500 mm, stable and uniform components, smooth surface and no cracks in the interior is obtained. The results of the examples show that the surface of the AQ80M magnesium alloy oversized ingot blank prepared by the preparation method provided by the invention has no cracking phenomenon and defects, and when the sectional control is not adopted, cracking explosion occurs when the length of the magnesium alloy ingot is pulled to be 200mm by semi-continuous casting, the ingot blank is taken out for observation after cooling, and the AQ80M magnesium alloy ingot with the diameter phi 715mm is cast to fail due to the longitudinal crack penetrating the whole ingot along the casting direction.
Drawings
FIG. 1 is a physical diagram of an AQ80M magnesium alloy oversized ingot blank prepared in example 1 of the present invention;
FIG. 2 is a physical diagram of an oversized AQ80M magnesium alloy ingot blank prepared in example 2 of the present invention;
FIG. 3 is a whole physical diagram of an AQ80M magnesium alloy oversized ingot blank prepared in example 2 of the present invention;
fig. 4 is a physical diagram of an AQ80M magnesium alloy oversized ingot prepared in example 3 of the present invention.
Detailed Description
The invention provides a preparation method of an AQ80M magnesium alloy oversized ingot blank, which comprises the following steps:
(1) Sequentially carrying out slag skimming and refining after the alloy raw materials are melted to obtain alloy melt;
(2) Performing semi-continuous casting on the alloy melt obtained in the step (1) to obtain an AQ80M magnesium alloy oversized ingot blank;
the semi-continuous casting comprises a first-stage semi-continuous casting and a second-stage semi-continuous casting which are sequentially carried out;
the parameters of the one-stage semi-continuous casting include: the temperature is 640-660 ℃, the frequency of the electromagnetic field is 10-20 HZ, the low-frequency current is 80-100 mA, the ingot pulling speed is 10-20 mm/min, and the cooling water strength is 25-38 m 3 /h; the length of the ingot obtained by the semi-continuous casting of the section is 100-500 mm;
the parameters of the two-stage semi-continuous casting include: the temperature is 640-660 ℃, the frequency of the electromagnetic field is 15-25 HZ, the low-frequency current is 90-120 mA, the ingot pulling speed is 20-35 mm/min, and the cooling water strength is 38-50 m 3 /h; the diameter of the AQ80M magnesium alloy oversized ingot blank is 650-800 mm.
The invention sequentially carries out slag skimming and refining after melting the alloy raw materials to obtain alloy melt.
In the invention, the alloy raw material preferably comprises high-purity magnesium ingot, high-purity aluminum ingot, high-purity zinc ingot and MnCl 2 Particles, mg-RE master alloys, mg-Ca master alloys and high purity silver. In the present invention, the Mg-RE master alloy is preferably a Mg-30RE master alloy, more preferably a Mg-30 (y+ce) master alloy, wherein the mass ratio of Y to Ce is preferably 1:1, a step of; the Mg-Ca master alloy is preferably a Mg-30Ca master alloy. The particle size of the alloy raw material is not particularly limited, and may be determined according to the technical common knowledge of a person skilled in the art. The specific source of the alloy raw material is not particularly limited in the present invention, and commercially available products known to those skilled in the art may be used.
In the present invention, the melting means is preferably: firstly, melting a high-purity magnesium ingot, and then sequentially adding a high-purity aluminum ingot, a high-purity zinc ingot and MnCl 2 Particles, mg-RE master alloys, mg-Ca master alloys and high purity silver.
In the present invention, the melting temperature is preferably 700 to 775 ℃, more preferably 720 to 760 ℃, and even more preferably 740 to 750 ℃. In the present invention, when the melting temperature is lower than 700 ℃, the present invention preferably heats the alloy melt. The heating mode is not particularly limited in the present invention, and the melting temperature may be maintained within the range of 700 to 775 ℃. The invention controls the melting temperature, the temperature is always reduced in the process of adding alloy raw materials, when the temperature is lower than 700 ℃, the intermediate alloy cannot be melted in, the intermediate alloy is lost, the temperature is too high, and the burning loss is easy to be caused, so that the melting temperature is required to be controlled within the range of 700-775 ℃.
In the present invention, the melting is preferably performed under stirring conditions, and the stirring is preferably performed by introducing argon gas. The invention can avoid the oxidation of introduced oxygen by adopting an argon stirring mode.
In the present invention, it is preferable that a covering agent is further added each time an alloy raw material is added. The specific amount of the covering agent is not particularly limited, and the covering agent can just cover the surface of the molten liquid. According to the invention, the covering agent is sprayed in, so that the oxidation of metal elements in the stirring process can be avoided, and meanwhile, excessive covering agent is added, so that the magnesium liquid inclusion in the casting process is increased, and more internal defects are easy to generate when the ultra-large diameter AQ80M magnesium alloy ingot is prepared, so that the surface of molten liquid is just covered.
The specific operation of the skimming is not particularly limited, and slag floating on the liquid surface can be removed.
In the present invention, the refining temperature is preferably 700 to 780 ℃, more preferably 760 to 780 ℃; the refining time is preferably 5 to 25 minutes, more preferably 10 to 20 minutes. The invention can better remove gas and slag by controlling the refining temperature and time.
In the invention, the refining mode is preferably stirring refining by introducing argon into the bottom of the melt. According to the invention, the stirring refining is carried out in the mode, so that the stirring is sufficient, the solute atoms are more uniformly dispersed in the melt, and the macrosegregation of the follow-up oversized-diameter cast ingot is reduced.
In the present invention, the refining process preferably further includes sprinkling a covering agent. The invention does not have special limitation on the spreading amount of the covering agent, and the covering agent just covers the surface of the alloy molten liquid.
In the invention, the refining process preferably further comprises the steps of sampling and analyzing components of the refined product, carrying out secondary slag skimming on the refined product when the components of the refined product are qualified, and then cooling and standing; and when the components of the refined product are not qualified, re-feeding is calculated according to a batching table, and then the operations of skimming and refining are repeated until the components of the refined product are qualified. In the invention, the temperature of the cooling and standing is preferably 670-690 ℃, more preferably 675-685 ℃; the temperature-reducing and standing heat-preserving time is preferably 1-3 hours. The specific operations of the analysis and re-feeding of the sampled components are not particularly limited in the present invention, and may be determined according to the technical common knowledge of those skilled in the art. According to the invention, through component analysis, the chemical components of the alloy melt can be ensured to meet the requirements of the AQ80M magnesium alloy.
After the analysis of the sampling components is finished, the invention preferably carries out secondary deslagging on the qualified product. The specific operation of the secondary slag skimming is not particularly limited, and slag floating on the liquid surface can be removed.
After the alloy melt is obtained, the alloy melt is subjected to semi-continuous casting, and the AQ80M magnesium alloy oversized ingot blank is obtained.
In the present invention, the semi-continuous casting includes a first-stage semi-continuous casting and a second-stage semi-continuous casting which are sequentially performed.
In the present invention, the semi-continuous casting is preferably performed in a mold equipped with an exciting coil.
In the present invention, the atmosphere of the semi-continuous casting is preferably SF 6 +CO 2 And (5) mixing the atmosphere. The invention aims at the SF 6 +CO 2 SF in mixed atmosphere 6 And CO 2 The volume ratio of (2) is not particularly limited and may be determined according to the technical common knowledge of a person skilled in the art. The invention can avoid metal oxidation by controlling the atmosphere of semi-continuous casting.
In the present invention, the parameters of the one-stage semi-continuous casting include: temperature (temperature)The temperature is 640-660 ℃, the frequency of an electromagnetic field is 10-20 HZ, the low-frequency current is 80-100 mA, the ingot pulling speed is 10-20 mm/min, and the strength of cooling water is 25-38 m 3 /h; preferably, it is: the temperature is 645-650 ℃, the frequency of the electromagnetic field is 15-20 HZ, the low-frequency current is 90-100 mA, the ingot pulling speed is 15-20 mm/min, and the cooling water strength is 30-38 m 3 /h。
In the present invention, the length of the ingot obtained by the one-stage semi-continuous casting is preferably 100 to 500mm, more preferably 200 to 450mm, and still more preferably 250 to 400mm.
In the present invention, the parameters of the two-stage semi-continuous casting include: the temperature is 640-660 ℃, the frequency of the electromagnetic field is 15-25 HZ, the low-frequency current is 90-120 mA, the ingot pulling speed is 20-35 mm/min, and the cooling water strength is 38-50 m 3 /h; preferably, it is: the temperature is 645-650 ℃, the frequency of the electromagnetic field is 20-25 HZ, the low-frequency current is 100-110 mA, the ingot pulling speed is 20-30 mm/min, and the cooling water strength is 38-45 m 3 /h。
In the invention, the diameter of the AQ80M magnesium alloy oversized ingot blank is 650-800 mm; the length of the AQ80M magnesium alloy oversized ingot blank is preferably 1500-4500 mm, more preferably 2000-3500 mm, and even more preferably 2500-3000 mm.
In the invention, the components of the AQ80M magnesium alloy oversized ingot blank are preferably as follows in percentage by mass: al:7.5 to 9.0 percent of Ag:0.02 to 0.80 percent of Zn:0.35 to 0.55 percent of Mn:0.05 to 0.30 percent of RE:0.01 to 0.10 percent of Ca: 0.001-0.020%, fe less than or equal to 0.02%, si less than or equal to 0.05%, cu less than or equal to 0.02%, ni less than or equal to 0.001% and the balance Mg.
According to the invention, the electromagnetic field is introduced to reduce the transverse temperature gradient from the side part to the core part during solidification and crystallization of the melt, so that the flow of the magnesium solution is improved, and the depth of a liquid cavity is reduced; through the control of inclusions, full stirring, and the regulation and reasonable collocation of the ranges of electromagnetic frequency, low-frequency current, casting temperature, ingot pulling speed and cooling water strength, the high-quality AQ80M magnesium alloy oversized ingot blank with the diameter of 650-800 mm, the length of 1500-4500 mm, stable and uniform components, smooth surface and no cracks in the interior is obtained.
The invention also provides an AQ80M magnesium alloy oversized ingot blank prepared by the preparation method.
In the invention, the diameter of the AQ80M magnesium alloy oversized ingot blank is 650-800 mm; the length of the AQ80M magnesium alloy oversized ingot blank is preferably 1500-4500 mm, more preferably 2000-3500 mm, and even more preferably 2500-3000 mm.
In the invention, the components of the AQ80M magnesium alloy oversized ingot blank are preferably as follows in percentage by mass: al:7.5 to 9.0 percent of Ag:0.02 to 0.80 percent of Zn:0.35 to 0.55 percent of Mn:0.05 to 0.30 percent of RE:0.01 to 0.10 percent of Ca: 0.001-0.020%, fe less than or equal to 0.02%, si less than or equal to 0.05%, cu less than or equal to 0.02%, ni less than or equal to 0.001% and the balance Mg.
The invention also provides application of the AQ80M magnesium alloy oversized ingot blank in the fields of aerospace, weaponry, automobile industry and hydrogen storage materials.
The specific application mode of the AQ80M magnesium alloy oversized ingot blank is not particularly limited, and the AQ80M magnesium alloy oversized ingot blank can be used in a mode well known to those skilled in the art.
The technical solutions of the present invention will be clearly and completely described in the following in connection with the embodiments of the present invention. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
A preparation method of an AQ80M magnesium alloy oversized ingot blank comprises the following steps:
(1) Firstly, melting a high-purity magnesium ingot, and then sequentially adding a high-purity aluminum ingot, a high-purity zinc ingot and MnCl 2 The method comprises the steps of (1) introducing argon into the process of adding alloy raw materials to stir and spread a covering agent, sequentially carrying out slag skimming and refining, then carrying out sampling component analysis, carrying out secondary slag skimming, and finally cooling and standing at 685 ℃ for 1.5h to obtain alloy melt; the melting temperature is maintained at 70Heating at a temperature below 700 ℃ in the range of 0-775 ℃; the refining temperature is 750 ℃, the refining time is 10min, and a covering agent is scattered in the refining process; the refining mode is that argon is introduced into the bottom of the melt for stirring refining;
(2) Performing semi-continuous casting on the alloy melt obtained in the step (1) in a crystallizer provided with an excitation coil to obtain an AQ80M magnesium alloy oversized ingot blank;
the semi-continuous casting is a first-stage semi-continuous casting and a second-stage semi-continuous casting which are sequentially carried out; the atmosphere of the semi-continuous casting is SF 6 +CO 2 A mixed atmosphere;
the parameters of the one-section semi-continuous casting are as follows: the temperature is 650 ℃, the frequency of the electromagnetic field is 15HZ, the low-frequency current is 90mA, the ingot pulling speed is 15mm/min, and the cooling water strength is 33m 3 /h; the length of the ingot obtained by the semi-continuous casting of the section is 250mm;
the parameters of the two-section semi-continuous casting are as follows: the temperature is 650 ℃, the frequency of an electromagnetic field is 20HZ, the low-frequency current is 100mA, the ingot pulling speed is 25mm/min, and the strength of cooling water is 40m 3 /h; the diameter of the AQ80M magnesium alloy oversized ingot blank is 715mm, and the length of the AQ80M magnesium alloy oversized ingot blank is 1900mm;
the AQ80M magnesium alloy oversized ingot comprises the following components in percentage by mass: al:8.0%, ag:0.10%, zn:0.40%, mn:0.15%, RE (y+ce): 0.08%, ca:0.010%, fe less than or equal to 0.02%, si less than or equal to 0.05%, cu less than or equal to 0.02%, ni less than or equal to 0.001% and the balance Mg, wherein the mass ratio of Y to Ce is 1:1.
fig. 1 is a physical diagram of an AQ80M magnesium alloy oversized ingot prepared in example 1. As can be seen from FIG. 1, the surface of the AQ80M magnesium alloy oversized ingot blank prepared by the preparation method provided by the invention has no cracking phenomenon and defects.
Example 2
A preparation method of an AQ80M magnesium alloy oversized ingot blank comprises the following steps:
(1) Firstly, melting a high-purity magnesium ingot, and then sequentially adding a high-purity aluminum ingot, a high-purity zinc ingot and MnCl 2 Intermediate of particles and Mg-30RE (Y+Ce)Introducing argon into the process of adding the alloy raw materials to stir and scatter a covering agent, sequentially carrying out slag skimming and refining, then carrying out sampling component analysis, carrying out secondary slag skimming after the components are qualified, and finally cooling and standing at 680 ℃ for 1.8 hours to obtain alloy melt; the melting temperature is kept in the range of 700-775 ℃, and heating is carried out when the temperature is lower than 700 ℃; the refining temperature is 760 ℃, the refining time is 15min, and a covering agent is scattered in the refining process; the refining mode is that argon is introduced into the bottom of the melt for stirring refining;
(2) Performing semi-continuous casting on the alloy melt obtained in the step (1) in a crystallizer provided with an excitation coil to obtain an AQ80M magnesium alloy oversized ingot blank;
the semi-continuous casting is a first-stage semi-continuous casting and a second-stage semi-continuous casting which are sequentially carried out; the atmosphere of the semi-continuous casting is SF 6 +CO 2 A mixed atmosphere;
the parameters of the one-section semi-continuous casting are as follows: the temperature is 650 ℃, the frequency of the electromagnetic field is 15HZ, the low-frequency current is 95mA, the ingot pulling speed is 17mm/min, and the cooling water strength is 30m 3 /h; the length of the ingot obtained by the semi-continuous casting of the section is 200mm;
the parameters of the two-section semi-continuous casting are as follows: the temperature is 650 ℃, the frequency of an electromagnetic field is 20HZ, the low-frequency current is 105mA, the ingot pulling speed is 20mm/min, and the cooling water strength is 38m 3 /h; the diameter of the AQ80M magnesium alloy oversized ingot blank is 705mm, and the length of the AQ80M magnesium alloy oversized ingot blank is 2000mm;
the AQ80M magnesium alloy oversized ingot comprises the following components in percentage by mass: al:7.7%, ag:0.12%, zn:0.36%, mn:0.18%, RE (y+ce): 0.07%, ca:0.012 percent of Fe less than or equal to 0.02 percent, si less than or equal to 0.05 percent, cu less than or equal to 0.02 percent, ni less than or equal to 0.001 percent and the balance of Mg, wherein the mass ratio of Y to Ce is 1:1.
fig. 2 is a physical diagram of an AQ80M magnesium alloy oversized ingot prepared in example 2, and fig. 3 is a whole physical diagram of an AQ80M magnesium alloy oversized ingot prepared in example 2. As can be seen from fig. 2 and fig. 3, the AQ80M magnesium alloy oversized ingot blank prepared by the preparation method provided by the invention has no cracking phenomenon and no defects on the surface.
Example 3
A preparation method of an AQ80M magnesium alloy oversized ingot blank comprises the following steps:
(1) Firstly, melting a high-purity magnesium ingot, and then sequentially adding a high-purity aluminum ingot, a high-purity zinc ingot and MnCl 2 The method comprises the steps of (1) introducing argon into the process of adding alloy raw materials to stir and spread a covering agent, sequentially carrying out slag skimming and refining, then carrying out sampling component analysis, carrying out secondary slag skimming, and finally cooling and standing at 683 ℃ for 2.0h to obtain alloy melt, wherein the components are qualified; the melting temperature is kept in the range of 700-775 ℃, and heating is carried out when the temperature is lower than 700 ℃; the refining temperature is 750 ℃, the refining time is 12min, and a covering agent is scattered in the refining process; the refining mode is that argon is introduced into the bottom of the melt for stirring refining;
(2) Performing semi-continuous casting on the alloy melt obtained in the step (1) in a crystallizer provided with an excitation coil to obtain an AQ80M magnesium alloy oversized ingot blank;
the semi-continuous casting is a first-stage semi-continuous casting and a second-stage semi-continuous casting which are sequentially carried out; the atmosphere of the semi-continuous casting is SF 6 +CO 2 A mixed atmosphere;
the parameters of the one-section semi-continuous casting are as follows: the temperature is 650 ℃, the frequency of an electromagnetic field is 20HZ, the low-frequency current is 95mA, the ingot pulling speed is 18mm/min, and the cooling water strength is 33m 3 /h; the length of the ingot obtained by the semi-continuous casting of the section is 300mm;
the parameters of the two-section semi-continuous casting are as follows: the temperature is 650 ℃, the frequency of an electromagnetic field is 20HZ, the low-frequency current is 100mA, the ingot pulling speed is 30mm/min, and the strength of cooling water is 44m 3 /h; the diameter of the AQ80M magnesium alloy oversized ingot blank is 740mm, and the length of the AQ80M magnesium alloy oversized ingot blank is 2500mm;
the AQ80M magnesium alloy oversized ingot comprises the following components in percentage by mass: al:8.5%, ag:0.2%, zn:0.50%, mn:0.25%, RE (y+ce): 0.10%, ca:0.015 percent, less than or equal to 0.02 percent of Fe, less than or equal to 0.05 percent of Si, less than or equal to 0.02 percent of Cu, less than or equal to 0.001 percent of Ni and the balance of Mg, wherein the mass ratio of Y to Ce is 1:1.
fig. 4 is a physical diagram of an AQ80M magnesium alloy oversized ingot prepared in example 3. As can be seen from FIG. 4, the surface of the AQ80M magnesium alloy oversized ingot blank prepared by the preparation method provided by the invention has no cracking phenomenon and defects.
Example 4
A preparation method of an AQ80M magnesium alloy oversized ingot blank comprises the following steps:
(1) Firstly, melting a high-purity magnesium ingot, and then sequentially adding a high-purity aluminum ingot, a high-purity zinc ingot and MnCl 2 The method comprises the steps of (1) introducing argon into the process of adding alloy raw materials to stir and spread a covering agent, sequentially carrying out slag skimming and refining, then carrying out sampling component analysis, carrying out secondary slag skimming, and finally cooling and standing at 677 ℃ for 1.6h to obtain alloy melt, wherein the components are qualified; the melting temperature is kept in the range of 700-775 ℃, and heating is carried out when the temperature is lower than 700 ℃; the refining temperature is 750 ℃, the refining time is 15min, and a covering agent is scattered in the refining process; the refining mode is that argon is introduced into the bottom of the melt for stirring refining;
(2) Performing semi-continuous casting on the alloy melt obtained in the step (1) in a crystallizer provided with an excitation coil to obtain an AQ80M magnesium alloy oversized ingot blank;
the semi-continuous casting is a first-stage semi-continuous casting and a second-stage semi-continuous casting which are sequentially carried out; the atmosphere of the semi-continuous casting is SF 6 +CO 2 A mixed atmosphere;
the parameters of the one-section semi-continuous casting are as follows: the temperature is 645 ℃, the frequency of the electromagnetic field is 15HZ, the low-frequency current is 95mA, the ingot pulling speed is 20mm/min, and the cooling water strength is 31m 3 /h; the length of the ingot obtained by the semi-continuous casting of the section is 400mm;
the parameters of the two-section semi-continuous casting are as follows: the temperature is 645 ℃, the frequency of the electromagnetic field is 25HZ, the low-frequency current is 100mA, the ingot pulling speed is 25mm/min, and the ingot is cooledThe strength of the cooling water is 39m 3 /h; the diameter of the AQ80M magnesium alloy oversized ingot blank is 680mm, and the length of the AQ80M magnesium alloy oversized ingot blank is 4000mm;
the AQ80M magnesium alloy oversized ingot comprises the following components in percentage by mass: al:7.9%, ag:0.15%, zn:0.40%, mn:0.15%, RE (y+ce): 0.05%, ca:0.01 percent of Fe less than or equal to 0.02 percent, si less than or equal to 0.05 percent, cu less than or equal to 0.02 percent, ni less than or equal to 0.001 percent and the balance of Mg, wherein the mass ratio of Y to Ce is 1:1.
example 5
A preparation method of an AQ80M magnesium alloy oversized ingot blank comprises the following steps:
(1) Firstly, melting a high-purity magnesium ingot, and then sequentially adding a high-purity aluminum ingot, a high-purity zinc ingot and MnCl 2 The method comprises the steps of (1) introducing argon into the process of adding alloy raw materials to stir and spread a covering agent, sequentially carrying out slag skimming and refining, then carrying out sampling component analysis, carrying out secondary slag skimming, and finally cooling and standing at 680 ℃ for 1.5h to obtain alloy melt, wherein the components are qualified; the melting temperature is kept in the range of 700-775 ℃, and heating is carried out when the temperature is lower than 700 ℃; the refining temperature is 765 ℃, the refining time is 18min, and a covering agent is scattered in the refining process; the refining mode is that argon is introduced into the bottom of the melt for stirring refining;
(2) Performing semi-continuous casting on the alloy melt obtained in the step (1) in a crystallizer provided with an excitation coil to obtain an AQ80M magnesium alloy oversized ingot blank;
the semi-continuous casting is a first-stage semi-continuous casting and a second-stage semi-continuous casting which are sequentially carried out; the atmosphere of the semi-continuous casting is SF 6 +CO 2 A mixed atmosphere;
the parameters of the one-section semi-continuous casting are as follows: the temperature is 645 ℃, the frequency of the electromagnetic field is 15HZ, the low-frequency current is 100mA, the ingot pulling speed is 15mm/min, and the cooling water strength is 35m 3 /h; the length of the ingot obtained by the semi-continuous casting of the section is 150mm;
the parameters of the two-section semi-continuous casting are as follows: the temperature is 645 ℃, and the frequency of the electromagnetic field20HZ, 105mA low-frequency current, 25mm/min ingot pulling speed and 40m cooling water strength 3 /h; the diameter of the AQ80M magnesium alloy oversized ingot blank is 750mm, and the length of the AQ80M magnesium alloy oversized ingot blank is 1800mm;
the AQ80M magnesium alloy oversized ingot comprises the following components in percentage by mass: al:8.0%, ag:0.05%, zn:0.35%, mn:0.20%, RE (y+ce): 0.10%, ca:0.01 percent of Fe less than or equal to 0.02 percent, si less than or equal to 0.05 percent, cu less than or equal to 0.02 percent, ni less than or equal to 0.001 percent and the balance of Mg, wherein the mass ratio of Y to Ce is 1:1.
comparative example 1
A preparation method of an AQ80M magnesium alloy oversized ingot blank comprises the following steps:
(1) Firstly, melting a high-purity magnesium ingot, and then sequentially adding a high-purity aluminum ingot, a high-purity zinc ingot and MnCl 2 The method comprises the steps of (1) introducing argon into the process of adding alloy raw materials to stir and spread a covering agent, sequentially carrying out slag skimming and refining, then carrying out sampling component analysis, carrying out secondary slag skimming, and finally cooling and standing at 685 ℃ for 1.5h to obtain alloy melt; the melting temperature is kept in the range of 700-775 ℃, and heating is carried out when the temperature is lower than 700 ℃; the refining temperature is 750 ℃, the refining time is 10min, and a covering agent is scattered in the refining process; the refining mode is that argon is introduced into the bottom of the melt for stirring refining;
(2) Performing semi-continuous casting on the alloy melt obtained in the step (1) in a crystallizer provided with an excitation coil to obtain an AQ80M magnesium alloy oversized ingot blank;
the parameters of the semi-continuous casting in the step (2) are as follows: the temperature is 650 ℃, the frequency of an electromagnetic field is 20HZ, the low-frequency current is 100mA, the ingot pulling speed is 25mm/min, and the strength of cooling water is 40m 3 /h; the diameter of the AQ80M magnesium alloy oversized ingot blank is 715mm, and the length of the AQ80M magnesium alloy oversized ingot blank is 1900mm; the atmosphere of the semi-continuous casting is SF 6 +CO 2 A mixed atmosphere;
the AQ80M magnesium alloy oversized ingot comprises the following components in percentage by mass: al:8.0%, ag:0.10%, zn:0.40%, mn:0.15%, RE (y+ce): 0.08%, ca:0.010%, fe less than or equal to 0.02%, si less than or equal to 0.05%, cu less than or equal to 0.02%, ni less than or equal to 0.001% and the balance Mg, wherein the mass ratio of Y to Ce is 1:1.
in the preparation method of the comparative example 1, since the sectional control is not adopted, when semicontinuous casting is performed to the position where the length of the magnesium alloy ingot is 200mm, cracking explosion occurs, after cooling, taking out and observing, longitudinal cracks penetrating the whole ingot appear along the casting direction, and the casting of the AQ80M magnesium alloy ingot with the diameter phi 715mm fails.
The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which are intended to be comprehended within the scope of the present invention.
Claims (10)
1. A preparation method of an AQ80M magnesium alloy oversized ingot comprises the following steps:
(1) Sequentially carrying out slag skimming and refining after the alloy raw materials are melted to obtain alloy melt;
(2) Performing semi-continuous casting on the alloy melt obtained in the step (1) to obtain an AQ80M magnesium alloy oversized ingot blank;
the semi-continuous casting comprises a first-stage semi-continuous casting and a second-stage semi-continuous casting which are sequentially carried out;
the parameters of the one-stage semi-continuous casting include: the temperature is 640-660 ℃, the frequency of the electromagnetic field is 10-20 HZ, the low-frequency current is 80-100 mA, the ingot pulling speed is 10-20 mm/min, and the cooling water strength is 25-38 m 3 /h; the length of the ingot obtained by the semi-continuous casting of the section is 100-500 mm;
the parameters of the two-stage semi-continuous casting include: the temperature is 640-660 ℃, the frequency of the electromagnetic field is 15-25 HZ, the low-frequency current is 90-120 mA, the ingot pulling speed is 20-35 mm/min, and the cooling water strength is 38-50 m 3 /h; the diameter of the AQ80M magnesium alloy oversized ingot blank is 650-800 mm.
2. According to claim 1The preparation method is characterized in that the alloy raw materials in the step (1) comprise high-purity magnesium ingots, high-purity aluminum ingots, high-purity zinc ingots and MnCl 2 Particles, mg-RE master alloys, mg-Ca master alloys and high purity silver.
3. The method according to claim 2, wherein the melting in the step (1) is performed by: firstly, melting a high-purity magnesium ingot, and then sequentially adding a high-purity aluminum ingot, a high-purity zinc ingot and MnCl 2 Particles, mg-RE master alloys, mg-Ca master alloys and high purity silver.
4. The method according to claim 1, wherein the refining temperature in the step (1) is 700 to 780 ℃ and the refining time is 5 to 20min.
5. The method according to claim 1 or 4, wherein the refining in the step (1) is performed by introducing argon into the bottom of the melt and stirring and refining.
6. The method of claim 1, wherein the semi-continuous casting in step (2) is performed in a crystallizer equipped with an excitation coil.
7. The method according to claim 1, wherein the semi-continuous casting atmosphere in the step (2) is SF 6 +CO 2 And (5) mixing the atmosphere.
8. The preparation method according to claim 1, wherein the AQ80M magnesium alloy oversized ingot in the step (2) comprises the following components in percentage by mass: al:7.5 to 9.0 percent of Ag:0.02 to 0.80 percent of Zn:0.35 to 0.55 percent of Mn:0.05 to 0.30 percent of RE:0.01 to 0.10 percent of Ca: 0.001-0.020%, fe less than or equal to 0.02%, si less than or equal to 0.05%, cu less than or equal to 0.02%, ni less than or equal to 0.001% and the balance Mg.
9. The AQ80M magnesium alloy oversized ingot prepared by the method of any one of claims 1 to 8.
10. The use of the AQ80M magnesium alloy oversized ingot of claim 9 in aerospace, defense and military and transportation applications.
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