CN108977677B - Modification treatment method for aluminum alloy in low-pressure casting process - Google Patents
Modification treatment method for aluminum alloy in low-pressure casting process Download PDFInfo
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- CN108977677B CN108977677B CN201810869647.6A CN201810869647A CN108977677B CN 108977677 B CN108977677 B CN 108977677B CN 201810869647 A CN201810869647 A CN 201810869647A CN 108977677 B CN108977677 B CN 108977677B
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- 238000005266 casting Methods 0.000 title claims abstract description 50
- 229910000838 Al alloy Inorganic materials 0.000 title claims abstract description 28
- 230000004048 modification Effects 0.000 title claims abstract description 14
- 238000006011 modification reaction Methods 0.000 title claims abstract description 14
- 238000007872 degassing Methods 0.000 claims abstract description 17
- XKRFYHLGVUSROY-UHFFFAOYSA-N argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims abstract description 14
- 239000007788 liquid Substances 0.000 claims abstract description 12
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 8
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminum Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 8
- 229910052786 argon Inorganic materials 0.000 claims abstract description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 7
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 7
- 239000010439 graphite Substances 0.000 claims abstract description 7
- 238000007670 refining Methods 0.000 claims abstract description 5
- 238000003723 Smelting Methods 0.000 claims abstract description 4
- 230000000630 rising Effects 0.000 claims description 4
- 239000012535 impurity Substances 0.000 claims description 3
- 238000007689 inspection Methods 0.000 abstract description 2
- 238000002715 modification method Methods 0.000 abstract description 2
- 230000005496 eutectics Effects 0.000 description 7
- 239000003607 modifier Substances 0.000 description 4
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 4
- 229910052710 silicon Inorganic materials 0.000 description 4
- 239000010703 silicon Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 229910000979 O alloy Inorganic materials 0.000 description 2
- 238000002425 crystallisation Methods 0.000 description 2
- 230000005712 crystallization Effects 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- REDXJYDRNCIFBQ-UHFFFAOYSA-N aluminium(3+) Chemical class [Al+3] REDXJYDRNCIFBQ-UHFFFAOYSA-N 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 235000012438 extruded product Nutrition 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000004642 transportation engineering Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making alloys
- C22C1/02—Making alloys by melting
- C22C1/026—Alloys based on aluminium
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D18/00—Pressure casting; Vacuum casting
- B22D18/04—Low pressure casting, i.e. making use of pressures up to a few bars to fill the mould
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
- B22D27/20—Measures not previously mentioned for influencing the grain structure or texture; Selection of compositions therefor
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making alloys
- C22C1/06—Making alloys with the use of special agents for refining or deoxidising
Abstract
The invention provides a method for modifying aluminum alloy in a low-pressure casting process, which comprises the following steps: (1) and smelting aluminum liquid: adding 200kg of aluminum alloy ingot into a graphite crucible in a resistance crucible furnace, electrifying and preheating to 400-500 ℃, and preserving heat for 0.5 h; (2) refining treatment: raising the temperature of the furnace burden in the last step to 720-750 ℃, adding an Al-Ti-B grain refiner with the content of 0.3% after the furnace burden is completely melted, and introducing argon with the purity of 99.99% for rotary degassing; (3) and modification treatment: after the degassing and slagging-off operation is finished, low-pressure casting is carried out, and a Sr alterant with the content of 0.01 percent is introduced in the low-pressure casting liquid-raising stage; (4) and a pressure relief part: and after the low-pressure pouring cycle is finished, releasing pressure and taking out the casting to perform the next pouring cycle. The casting produced by the modification method has no pinhole defect through X-ray inspection.
Description
Technical Field
The invention relates to a low-pressure casting method of aluminum and aluminum alloy, belongs to the technical field of aluminum and aluminum alloy casting, and particularly relates to a modification treatment method of aluminum alloy in a low-pressure casting process.
Background
Aluminum is the most common metal in nonferrous metals, and aluminum alloy is widely applied to the fields of transportation, machinery, aerospace and the like due to a series of advantages of small density, high specific strength, excellent electric and heat conductivity and the like.
Aluminum alloy alterants are divided into single alterants and composite alterants. The Sr alterant has the advantages of good modification effect, long maintenance time, simple operation, no pollution and the like, thereby being developed rapidly compared with other alterants. Meanwhile, Sr element is active in chemical property and easy to oxidize, the Sr element is continuously oxidized and burnt with the extension of the heat preservation time of the melt, and the existence of Sr element increases the gas absorption tendency of the melt, so that the compactness of the alloy is reduced.
In the case of casting, when an aluminum alloy using an Sr alterant is poured for a long time, pinhole defects are easily generated in a casting.
Disclosure of Invention
The invention aims at the characteristic of long pouring process of low-pressure casting, and adopts an aluminum alloy modification treatment method to solve the problem of casting pinhole defect caused by long-time pouring due to the addition of Sr modifier in the production process.
The technical scheme of the invention is as follows:
in order to solve the technical problem, the invention provides a method for modifying aluminum alloy in a low-pressure casting process, which is characterized by comprising the following steps of:
(1) and smelting aluminum liquid: adding 200kg of aluminum alloy ingot into a graphite crucible in a resistance crucible furnace, electrifying and preheating to 400-500 ℃, and preserving heat for 0.5 h;
(2) refining treatment: raising the temperature of the furnace burden in the last step to 720-750 ℃, adding an Al-Ti-B grain refiner with the content of 0.3% after the furnace burden is completely melted, and introducing argon with the purity of 99.99% for rotary degassing;
(3) and modification treatment: after the degassing and slagging-off operation is finished, low-pressure casting is carried out, and a Sr alterant with the content of 0.007-0.01% is introduced in the low-pressure casting liquid rising stage;
(4) and a pressure relief part: and after the low-pressure pouring cycle is finished, releasing pressure and taking out the casting to perform the next pouring cycle.
The scheme is further improved, the aluminum alloy ingot adopts A356.0, and the content of each element is as follows: 6.5-7.5% of Si, 0-0.2% of Fe, 0-0.2% of Cu, 0-0.1% of Mn, 0.25-0.45% of Mg, 0-0.1% of Zn, 0-0.2% of Ti, no more than 0.05% of each impurity element, no more than 0.15% of total amount and the balance of Al.
In a further improvement of the scheme, the content of the Sr alterant in the step 3 is 0.01 percent.
In a further improvement of the above scheme, the degassing time in step 2 is 30 min.
The scheme is further improved, the Sr alterant needs to be prefabricated into a required shape, and the alterant is clamped between two filter screens during casting: the first filter screen and the second filter screen are arranged between the first filter screen and the second filter screen and are arranged at the position of the riser pipe orifice.
Has the advantages that:
1. the Sr alterant is introduced in the low-pressure casting liquid-lifting process, and the Sr alterant with the content of 0.01 percent is added in each working cycle.
2. The tensile strength of the A356.0 alloy after being heat treated by 0.01 percent Sr content modification is 282MPa, the yield strength is 200MPa, the elongation is 9.1 percent, and the performance of the A356.0 alloy is obviously improved compared with the performance of the aluminum alloy without adding Sr modifier and 0.007 percent of Sr modifier.
3. The casting produced by the modification method has no pinhole defect through X-ray inspection.
Drawings
Fig. 1 is a schematic view of the placement of an Sr alterant.
FIG. 2 is a metallographic structure of a casting according to example 1.
FIG. 3 is a metallographic structure of a casting according to example 2.
FIG. 4 is a metallographic structure of a casting according to example 3.
FIG. 5 shows mechanical properties of the aluminum alloys subjected to the respective refining and modifying treatments.
Detailed Description
The invention is further illustrated by the following specific figures and examples.
A modification treatment method of aluminum alloy in a low-pressure casting process is characterized by comprising the following steps:
(1) and smelting aluminum liquid: adding 200kg of aluminum alloy ingot into a graphite crucible in a resistance crucible furnace, electrifying and preheating to 400-500 ℃, and preserving heat for 0.5 h;
(2) refining treatment: raising the temperature of the furnace burden in the last step to 720-750 ℃, adding an Al-Ti-B grain refiner with the content of 0.3% after the furnace burden is completely melted, and introducing argon with the purity of 99.99% for rotary degassing;
(3) and modification treatment: after the degassing and slagging-off operation is finished, low-pressure casting is carried out, and a Sr alterant with the content of 0.007-0.01% is introduced in the low-pressure casting liquid rising stage;
(4) and a pressure relief part: and after the low-pressure pouring cycle is finished, releasing pressure and taking out the casting to perform the next pouring cycle.
The scheme is further improved, the aluminum alloy ingot adopts A356.0, and the content of each element is as follows: 6.5-7.5% of Si, 0-0.2% of Fe, 0-0.2% of Cu, 0-0.1% of Mn, 0.25-0.45% of Mg, 0-0.1% of Zn, 0-0.2% of Ti, no more than 0.05% of each impurity element, no more than 0.15% of total amount and the balance of Al.
In a further improvement of the scheme, the content of the Sr alterant in the step 3 is 0.01 percent.
In a further improvement of the above scheme, the degassing time in step 2 is 30 min.
The scheme is further improved, the Sr alterant needs to be prefabricated into a required shape, and the alterant is clamped between two filter screens during casting: the first filter screen 1 and the second filter screen 2 are arranged between the riser pipe orifices.
As shown in fig. 1 to 5, example 1:
(1) adding 200kg of A356.0 aluminum alloy ingot into a graphite crucible in a resistance crucible furnace, electrifying and preheating to 400-500 ℃, and preserving heat for 0.5 h;
(2) and raising the temperature to 720-750 ℃, adding an Al-Ti-B grain refiner with the content of 0.3% after the furnace burden is completely melted, and introducing argon with the purity of 99.99% for rotary degassing for 30 min.
(3) After the degassing and slagging-off operation is finished, low-pressure casting is carried out, and in this case, no alterant is added.
(4) And after the low-pressure pouring cycle is finished, releasing pressure and taking out the casting to perform the next pouring cycle.
Example 2:
(1) 200kg of A356.0 aluminum alloy ingot is added into a graphite crucible in a resistance crucible furnace, and is electrified and preheated to 400-500 ℃, and the temperature is kept for 0.5 h.
(2) And raising the temperature to 720-750 ℃, adding an Al-Ti-B grain refiner with the content of 0.3% after the furnace burden is completely melted, and introducing argon with the purity of 99.99% for rotary degassing for 30 min.
(3) After the degassing and slagging-off operation is finished, low-pressure casting is carried out, and a Sr alterant with the content of 0.007 percent is introduced in the low-pressure casting liquid rising stage.
(4) And after the low-pressure pouring cycle is finished, releasing pressure and taking out the casting to perform the next pouring cycle.
Example 3:
(1) 200kg of A356.0 aluminum alloy ingot is added into a graphite crucible in a resistance crucible furnace, and is electrified and preheated to 400-500 ℃, and the temperature is kept for 0.5 h.
(2) And raising the temperature to 720-750 ℃, adding an Al-Ti-B grain refiner with the content of 0.3% after the furnace burden is completely melted, and introducing argon with the purity of 99.99% for rotary degassing for 30 min.
(3) After the degassing and slagging-off operation is finished, low-pressure casting is carried out, and a Sr alterant with the content of 0.01 percent is introduced in the low-pressure casting liquid-raising stage.
(4) And after the low-pressure pouring cycle is finished, releasing pressure and taking out the casting to perform the next pouring cycle.
The same position of the casting produced in each example after the heat treatment was sampled, and the metallographic structure thereof was as shown in fig. 2, 3, and 4. It can be seen that the eutectic silicon phase is not refined and is dispersed in the eutectic structure in the form of long stripes when the Sr alterant is not added. When 0.007% of Sr alterant is added, the eutectic silicon phase begins to be refined, but the refinement is incomplete, and the eutectic silicon phase is dispersed in a point-shaped or rod-shaped manner in the eutectic structure. When 0.01% of Sr alterant is added, the eutectic silicon is completely refined and is uniformly dispersed in the eutectic structure in a dotted manner.
The tensile strength, yield strength and elongation of each sample were further tested, and the results are shown in fig. 5. As can be seen from FIG. 5, by adopting the modification treatment method, various mechanical properties of the aluminum alloy can be remarkably improved, and the application range of the Sr modifier in low-pressure casting of the aluminum alloy is expanded.
No pinhole defect of the castings prepared in the embodiments is found by X-ray detection.
The low pressure casting method of the present invention mainly vacuumizes the air on the die disc, presses the aluminum liquid into the crystallizer through pressure difference, and then realizes the casting of the horizontal liquid level through the adjustment of the liquid level of the discharge hole and the launder, so that the pressure difference of the casting liquid level is reduced, and the crystallization height can be adjusted through the air pressure adjustment of the discharge hole. The present invention maintains the advantages of conventional hot top and gas slide casting, and improves the surface quality of the casting and reduces segregation on the structure, as shown in the following by comparing fig. 3 with fig. 4. In addition, the adjustable crystallization height realizes that one crystallizer meets the requirements of different grades, reduces the production cost and improves the production efficiency and the quality of extruded products.
Finally, it should be noted that the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to examples, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the claims of the present invention.
Claims (4)
1. A modification treatment method of aluminum alloy in a low-pressure casting process is characterized by comprising the following steps:
(1) and smelting aluminum liquid: adding 200kg of aluminum alloy ingot into a graphite crucible in a resistance crucible furnace, electrifying and preheating to 400-500 ℃, and preserving heat for 0.5 h;
(2) refining treatment: raising the temperature of the furnace burden in the last step to 720-750 ℃, adding an Al-Ti-B grain refiner with the content of 0.3% after the furnace burden is completely melted, and introducing argon with the purity of 99.99% for rotary degassing;
(3) and modification treatment: after the degassing and slagging-off operation is finished, low-pressure casting is carried out, and a Sr alterant with the content of 0.007-0.01% is introduced in the low-pressure casting liquid rising stage;
(4) and a pressure relief part: after the low-pressure pouring cycle is finished, releasing pressure and taking out the casting to perform the next pouring cycle;
the Sr alterant needs to be prefabricated into a required shape, and the alterant is clamped between two filter screens during casting: the first filter screen (1) and the second filter screen (2) are arranged between the riser pipe orifice.
2. The method for modifying the aluminum alloy in the low-pressure casting process according to claim 1, wherein the aluminum alloy ingot is A356.0, and the contents of the elements are respectively as follows: 6.5-7.5% of Si, 0-0.2% of Fe, 0-0.2% of Cu, 0-0.1% of Mn, 0.25-0.45% of Mg, 0-0.1% of Zn, 0-0.2% of Ti, no more than 0.05% of each impurity element, no more than 0.15% of total amount and the balance of Al.
3. The method according to claim 1, wherein the content of Sr alterant in the step 3 is 0.01%.
4. The method of claim 1, wherein the degassing time in step 2 is 30 min.
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| CN201810869647.6A CN108977677B (en) | 2018-08-02 | 2018-08-02 | Modification treatment method for aluminum alloy in low-pressure casting process |
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| CN201810869647.6A CN108977677B (en) | 2018-08-02 | 2018-08-02 | Modification treatment method for aluminum alloy in low-pressure casting process |
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| CN108977677B true CN108977677B (en) | 2020-08-04 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110396626A (en) * | 2019-07-22 | 2019-11-01 | 张家港市众欣机械有限公司 | A kind of high tenacity, corrosion resistant aluminum alloy material and preparation method thereof |
| CN111378880A (en) * | 2020-02-24 | 2020-07-07 | 广东润华材料科技有限公司 | Rare earth cast aluminum alloy mobile phone shell and preparation method thereof |
| CN111618276A (en) * | 2020-07-18 | 2020-09-04 | 常州嘉阳轻合金有限公司 | Low-pressure casting process of iron eight-axis aluminum alloy gearbox |
| CN112575231A (en) * | 2020-11-16 | 2021-03-30 | 中国兵器科学研究院宁波分院 | Vacuum refining modification treatment method for A356 high-strength aluminum alloy |
| CN112775414A (en) * | 2021-01-11 | 2021-05-11 | 山东一立动力科技股份有限公司 | Low-pressure casting method of aluminum alloy fan blade |
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