CN115418519A - Novel modification process of aluminum-silicon alloy - Google Patents
Novel modification process of aluminum-silicon alloy Download PDFInfo
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- CN115418519A CN115418519A CN202211046835.1A CN202211046835A CN115418519A CN 115418519 A CN115418519 A CN 115418519A CN 202211046835 A CN202211046835 A CN 202211046835A CN 115418519 A CN115418519 A CN 115418519A
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- 238000012986 modification Methods 0.000 title claims abstract description 58
- 230000004048 modification Effects 0.000 title claims abstract description 57
- 238000000034 method Methods 0.000 title claims abstract description 35
- 230000008569 process Effects 0.000 title claims abstract description 33
- CSDREXVUYHZDNP-UHFFFAOYSA-N alumanylidynesilicon Chemical compound [Al].[Si] CSDREXVUYHZDNP-UHFFFAOYSA-N 0.000 title claims abstract description 20
- 229910000676 Si alloy Inorganic materials 0.000 title claims abstract description 18
- 229910052712 strontium Inorganic materials 0.000 claims abstract description 114
- CIOAGBVUUVVLOB-UHFFFAOYSA-N strontium atom Chemical compound [Sr] CIOAGBVUUVVLOB-UHFFFAOYSA-N 0.000 claims abstract description 103
- 239000007788 liquid Substances 0.000 claims abstract description 62
- 239000003607 modifier Substances 0.000 claims abstract description 42
- 239000000155 melt Substances 0.000 claims abstract description 34
- 238000004519 manufacturing process Methods 0.000 claims abstract description 31
- 229910000838 Al alloy Inorganic materials 0.000 claims abstract description 29
- 238000007670 refining Methods 0.000 claims abstract description 16
- -1 strontium modified aluminum Chemical class 0.000 claims abstract description 12
- 238000005266 casting Methods 0.000 claims abstract description 10
- 238000004321 preservation Methods 0.000 claims abstract description 9
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 28
- 229910052782 aluminium Inorganic materials 0.000 claims description 28
- 229910045601 alloy Inorganic materials 0.000 claims description 27
- 239000000956 alloy Substances 0.000 claims description 27
- 239000000463 material Substances 0.000 claims description 14
- 238000005070 sampling Methods 0.000 claims description 7
- 238000003756 stirring Methods 0.000 claims description 7
- 238000009529 body temperature measurement Methods 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 2
- 229910021364 Al-Si alloy Inorganic materials 0.000 claims 10
- 238000012360 testing method Methods 0.000 claims 2
- 238000013102 re-test Methods 0.000 claims 1
- 230000008901 benefit Effects 0.000 abstract description 8
- 230000002035 prolonged effect Effects 0.000 abstract description 4
- 239000000654 additive Substances 0.000 abstract description 2
- 230000000996 additive effect Effects 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 41
- 239000000047 product Substances 0.000 description 19
- 230000006866 deterioration Effects 0.000 description 11
- 238000001514 detection method Methods 0.000 description 8
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 7
- 229910052708 sodium Inorganic materials 0.000 description 7
- 239000011734 sodium Substances 0.000 description 7
- 238000005259 measurement Methods 0.000 description 5
- 238000002360 preparation method Methods 0.000 description 5
- 238000012795 verification Methods 0.000 description 5
- 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
- 238000005516 engineering process Methods 0.000 description 3
- 230000005496 eutectics Effects 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- YNDGDLJDSBUSEI-UHFFFAOYSA-N aluminum strontium Chemical compound [Al].[Sr] YNDGDLJDSBUSEI-UHFFFAOYSA-N 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 238000004090 dissolution Methods 0.000 description 2
- 239000006052 feed supplement Substances 0.000 description 2
- 238000011534 incubation Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical class [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005660 chlorination reaction Methods 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 229910052736 halogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000002715 modification method Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 159000000000 sodium salts Chemical class 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 239000002341 toxic gas Substances 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/06—Making non-ferrous alloys with the use of special agents for refining or deoxidising
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/026—Alloys based on aluminium
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention discloses a new modification process of aluminum-silicon alloy, wherein a strontium modifier is added before the aluminum alloy liquid is produced and used to form strontium modified aluminum liquid, the strontium modifier accounts for 0.008-0.01% of the total mass of furnace charge, the strontium modifier is transferred into a machine side heat preservation furnace of a casting machine for standby after the determination meets the requirement, the strontium modifier is added half an hour before the aluminum alloy liquid is produced and used, or is added during the refining, and the Sr element content of a melt is determined after the refining is finished. The consumption of the modifier is reduced by using the strontium element with the addition amount of less than 0.01 percent, the modification effective period is prolonged from about 2 hours to about 3.5 hours, and compared with the common additive amount, the modifier can obviously reduce the production cost, can reduce the production cost and obviously improve the economic benefit and the production efficiency.
Description
Technical Field
The invention relates to the technical field of casting aluminum alloy smelting, in particular to a novel modification process of an aluminum-silicon alloy, which is used for modification treatment of ZL107 alloy, and is particularly suitable for all aluminum alloy products modified by Al-Sr10, so that the production cost can be reduced, and the economic benefit can be obviously improved.
Background
With the further development of modern science and technology and the increasing quality requirements of people on cast aluminum alloys, new modification processing methods, modification mechanisms and modification capabilities of alloys, interaction among modification elements, the relationship between microstructures and mechanical properties and the like are the main research directions in recent years. Therefore, the selection of long-acting alterant with low cost, good effect and little pollution and reasonable modification process are the major trends of modern process research.
The same effect as sodium modification can be obtained by adding 0.02-0.10% of Sr into hypoeutectic aluminum-silicon alloy, and the modification effect has long-acting modification effect, the modification effect effective time can reach 6-7 hours, but the Sr modified alloy liquid has an incubation period of 30-45 minutes. Sr can be added into the melt in various forms, and the aluminum-strontium intermediate alloy is generally used for modification treatment in engineering. The common aluminum-silicon alloy modifier is slowly melted in the melt and can sink to the bottom of the alloy liquid, and the aluminum-silicon alloy modifier is continuously stirred for about 10 minutes when in use.
After the aluminum-silicon alloy is modified by strontium, the eutectic silicon is changed into a fibrous shape from a needle shape, and the alloy structure is refined, so that the alloy performance is improved. The deterioration of strontium is not sensitive to the cooling speed, but the chemical property of strontium is extremely active, so that the strontium is extremely easy to oxidize and the aluminum liquid absorbs hydrogen; the latent period of strontium deterioration is long, the air suction tendency is severe, and the alloy is easy to loosen, so that the compactness is reduced; because the strontium is seriously burnt by chlorination reaction of the strontium, the strontium is not suitable for refining by using chloride when being modified, and argon or nitrogen is preferably introduced; in addition, the modification elements Te, sb and the like have interference effect on the modification of strontium, but can be used together with sodium salt, and the modification elements Te and Sb are complementary to each other and have the effects of no modification latency and enough long-acting property.
When the intermediate alloy modification method is adopted, a modifier is prepared into the intermediate alloy, and then the intermediate alloy is added into alloy liquid or is charged together with a furnace and is melted into the alloy for modification treatment. Generally, the aluminum-strontium intermediate alloy is added into the aluminum liquid by a method of directly adding the aluminum alloy into the aluminum liquid after refining.
The sodium alterant is a high-efficiency alterant and has good modification effect on the aluminum-silicon alloy. After the aluminum-silicon alterant is modified by sodium, the metallographic structure of the aluminum-silicon alterant is in a hypoeutectic state, the tensile strength can be improved by half, the elongation can be improved by 5 times, and the mechanical property and the cutting processing property of the aluminum-silicon alloy can be obviously improved. However, this method has the following disadvantages: the deterioration effect is short in retention time, and the remelting is invalid, so that the requirement of modern mass continuous operation cannot be met; the halogen salt alterant can generate a large amount of toxic gas in high-temperature molten aluminum to pollute plants and corrode equipment; the residual sodium amount in the alloy is not suitable to be controlled, slag inclusion and pollution are easy to generate, the sodium density is small, the sodium is easy to enrich on the surface of the aluminum liquid, the upper aluminum liquid is excessively deteriorated, and the lower aluminum liquid is insufficiently deteriorated, so that the mechanical property is influenced.
The strontium alterant can achieve the sodium modification effect and has the advantages of long-acting property, high absorption rate, capability of keeping the original performance after being remelted for many times, no over-modification phenomenon and the like. The strontium alterant mainly influences the growth of eutectic silicon by adsorbing element strontium on the surface of a silicon phase structure of the aluminum-silicon alloy, thereby achieving the effect of refining the eutectic silicon. But the excellent performance of the aluminum-silicon alloy is influenced by the defects of deterioration decline, long incubation period, quick oxidation and burning loss, low compactness, high price and the like of the strontium.
Compared with the prior art, the modification technology of the Sr element content of the melt of more than or equal to 0.008 percent and less than 0.01 percent plays the effects of reducing the addition amount of the Sr element and reducing the production cost; the Al-Sr10 flake alterant with the thickness of 1mm is used, so that the rapid dissolution and dispersion are facilitated, and the production efficiency is improved.
In summary, the Sr content of the melt in the prior art is more than 0.02%, and the modification technology of the Sr content of the melt which is more than or equal to 0.008% and less than 0.01% achieves the effects of reducing the Sr element addition and reducing the production cost compared with the prior art.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a novel modification process of an aluminum-silicon alloy. The invention uses less than 0.01 percent of strontium element to reduce the consumption of the alterant, and the modification effective period is prolonged from about 2 hours to about 3.5 hours. Compared with the common additive amount, the production cost can be obviously reduced, and the economic benefit of enterprises is improved. The invention is suitable for the modification treatment of ZL107 alloy, in particular to all aluminum alloy products modified by Al-Sr10, and can reduce the production cost and obviously improve the economic benefit.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a new modification process for aluminum-silicon alloy is characterized in that a strontium modifier is added to form strontium modified aluminum liquid before the aluminum alloy liquid is produced and used, the adding amount of the strontium modifier accounts for 0.008% -0.01% of the total mass of furnace charge, and the strontium modifier is transferred to a machine-side heat preservation furnace of a casting machine for standby after being determined to meet the requirements.
The strontium alterant is added half an hour before the production and use of the aluminum alloy liquid, or is added during refining, and the Sr element content of the melt is measured after the refining is finished.
The temperature of the aluminum alloy liquid is kept at 700 +/-20 ℃ when the strontium alterant is put into the furnace.
The temperature measurement of the aluminum alloy liquid is carried out at the middle position of the depth size of the aluminum liquid.
The strontium alterant is Al-Sr10 intermediate alloy flake alterant with the thickness of 1 mm.
The flaky alterant is placed beside a furnace to be roasted and preheated before being put into the furnace, so that the temperature of the alterant can be improved through roasting and preheating, the influence of the addition of alterant materials on the temperature of a melt is reduced as much as possible, moisture can be eliminated, the safety of operators is ensured, and the product quality is improved.
The strontium modified aluminum liquid is used within the specified time of the process, if the strontium modified aluminum liquid is not used within the specified time, the strontium content needs to be detected again in the subsequent production, and the Al-Sr10 intermediate alloy flake modifier is added again, so that the total input amount of the strontium modifier accounts for 0.008% -0.01% of the total mass of the furnace burden.
The strontium modified aluminum liquid is required to be used within 3-3.5 hours specified by the process.
And (3) when the strontium content is detected again, the melt is stirred properly, molten aluminum splashing and gas entrainment can not be caused in the stirring process, and after the melt components are uniform, the sampling and detection are finished at the middle position of the melt depth to ensure the representativeness of the sampled product.
The invention has the beneficial effects that:
1. according to the invention, the addition amount of the strontium element is less than 0.01%, the addition amount of the Sr element is reduced, the consumption amount of the alterant is reduced, the modification effective period is prolonged from about 2 hours to 3.5 hours, the excellent performance of the aluminum-silicon alloy can be ensured, compared with the common addition amount in the prior art, the production cost can be obviously reduced, and the economic benefit of an enterprise is improved.
2. The invention is suitable for the modification treatment of ZL107 alloy, is particularly suitable for all aluminum alloy products modified by Al-Sr10, can reduce the production cost and obviously improve the economic benefit.
3. The flaky alterative is placed beside a furnace for baking and preheating before being put into use, so that the temperature of the alterative can be increased through baking and preheating, the influence of the addition of alterative materials on the temperature of a melt is reduced to the greatest extent, moisture can be eliminated, the safety of operators is ensured, and the product quality is improved.
4. The Al-Sr10 flake alterant with the thickness of 1mm is adopted, so that the rapid dissolution and dispersion are facilitated, and the production efficiency is improved.
5. The invention has good metamorphic effect through detection, and compared with the common strontium element with the addition amount of 0.02-0.10 percent, the invention has similar effect on the premise of meeting the requirement of mechanical property, thereby obviously reducing the production cost.
6. The temperature of the aluminum alloy liquid is measured at the middle position of the depth size of the aluminum liquid. And detecting the strontium content again, properly stirring the melt during sampling detection, wherein molten aluminum splashing and gas entrainment can not be caused in the stirring process, and after the melt components are uniform, sampling and detecting are finished at the middle position of the melt depth to ensure the representativeness of the sampled product. The accuracy of the detection result is ensured, the accuracy of the addition amount of the added strontium element is ensured, the production cost is reduced on the premise of meeting the requirements of the process and the product quality, and the economic benefit and the production efficiency of enterprises are improved.
Drawings
FIG. 1 is a diagram illustrating the modification effect of 0.0099% strontium element in accordance with an embodiment of the present invention;
FIG. 2 is a graph showing the deterioration effect of 0.0088% strontium element in the example of the present invention;
FIG. 3 is a graph showing the deterioration effect of 0.0080% strontium element in the example of the present invention;
FIG. 4 is a graph showing the deterioration effect of 0.0071% strontium in the embodiment of the present invention;
FIG. 5 is a graph showing the deterioration effect of 0.0150% strontium element in the example of the present invention;
Detailed Description
A new modification process for aluminum-silicon alloy is characterized in that a strontium modifier is added before the aluminum alloy liquid is produced and used to form strontium modified aluminum liquid, the addition amount of the strontium modifier accounts for 0.008% -0.01% of the total mass of added furnace charge, and the strontium modifier is transferred into a machine-side heat preservation furnace of a casting machine for standby after being measured and meeting the requirements.
The strontium alterant is added half an hour before the aluminum alloy liquid is produced and used, or is added during refining, and the Sr element content of the melt is measured after the refining is finished, so that the requirement is met. The Sr element content is based on the actually measured Sr content in the molten aluminum after the subsequent Al-Sr10 alloy rod is dissolved, and the Sr content should be controlled to be more than or equal to 0.008 percent and less than 0.01 percent.
The temperature of the aluminum alloy liquid is kept at 700 +/-20 ℃ when the strontium alterant is added. The temperature measurement of the aluminum alloy liquid is carried out at the middle position of the depth size of the aluminum liquid.
The strontium alterant is Al-Sr10 intermediate alloy flake alterant with the thickness of 1 mm.
The flaky alterant is placed beside a furnace to be roasted and preheated before being put into the furnace, so that the temperature of the alterant can be improved through roasting and preheating, the influence of the addition of alterant materials on the temperature of a melt is reduced as much as possible, moisture can be eliminated, the safety of operators is ensured, and the product quality is improved.
The strontium modified aluminum liquid is used within the specified time of the process, and if the strontium modified aluminum liquid is required to be used within 3-3.5 hours of the process specification, the strontium-containing aluminum liquid is used. If the strontium is not used up within the specified time, the strontium content needs to be detected again during the subsequent production, and the Al-Sr10 intermediate alloy flake alterant is added again, so that the total input amount of the strontium alterant accounts for 0.008% -0.01% of the total mass of the furnace burden.
When the sampling detection is carried out again, the melt needs to be properly stirred, the aluminum liquid can not splash and gas entrainment can not occur in the stirring process, 5 minutes can be carried out after the stirring reaches the time specified by the process, and after the melt components are uniform, the sampling is finished at the middle position of the melt depth, so as to ensure the representativeness of the sampled product.
Compared with the existing strontium element addition amount (mass fraction is 0.02%), the strontium element addition amount of less than 0.01% reduces the consumption of the alterant, and the modification effective period is prolonged from about 2 hours to 3.5 hours.
In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the drawings in the embodiment of the present invention, and it is obvious that the described embodiment is only a part of the embodiment of the present invention, and not all embodiments.
Example 1
Referring to FIG. 1, FIG. 1 is a diagram showing the effect of this example after modification at 720 ℃ for 1 hour by using a modification process with a molten strontium content of 0.0099%.
1.1 preparation of the Material
Taking Al-Sr10 flaky alterant with the thickness of 1mm, and baking and preheating the alterant at the furnace side, so that on one hand, the temperature of the alterant can be increased, and the influence of the addition of alterant materials on the temperature of a melt is reduced as much as possible; on the other hand, moisture can be eliminated, the safety of operators is guaranteed, and the product quality is improved.
1.2 addition of alterants
1) The input time of the strontium modifier is as follows: the strontium modifier is put into operation half an hour before the aluminum alloy liquid is produced and used (strontium modification operation can be carried out during refining), and the temperature of the aluminum alloy liquid is kept at 720 ℃ during putting.
2) The input amount of the strontium modifier is as follows: the adding amount of strontium accounts for 0.0099 percent of the total mass of the furnace burden.
3) And after the measurement meets the requirements, transferring the product into a machine edge heat preservation furnace of a low-pressure casting machine for production.
1.3 supplement
The using time of the modified aluminum liquid is as follows: and (3) requiring that the strontium-containing aluminum liquid is used up within 3 hours, if the strontium-containing aluminum liquid is not used up within the specified time, detecting the strontium content during secondary production, and adding the Al-Sr10 intermediate alloy again according to the total mass of the residual aluminum liquid which is more than or equal to 0.008 percent and less than 0.01 percent.
1.4 Effect verification
The detection shows that the deterioration effect is shown in figure 1, and the mechanical property meets the requirement. Compared with the common strontium element with the addition amount of 0.02-0.10%, the effect is similar, but the production cost is obviously reduced.
Example 2
Referring to fig. 2, fig. 2 is a graph showing the effect of the present example after modification for 1 hour at 700 ℃ by using a modification process with a strontium element content of 0.0088% in the melt.
2.1 preparation of the Material
Taking Al-Sr10 flaky alterant with the thickness of 1mm, and baking and preheating the alterant at the furnace side, so that on one hand, the temperature of the alterant can be increased, and the influence of the addition of alterant materials on the temperature of a melt is reduced as much as possible; on the other hand, moisture can be eliminated, the safety of operators is guaranteed, and the product quality is improved.
2.2 addition of modificators
1) The input time of the strontium modifier is as follows: the strontium modifier is put into operation half an hour before the aluminum alloy liquid is produced and used (strontium modification operation can be carried out during refining), and the temperature of the aluminum alloy liquid is kept at 700 ℃ during putting.
2) The input amount of the strontium modifier is as follows: the adding amount of strontium accounts for 0.0088% of the total mass of the furnace charge.
3) And after the measurement meets the requirements, transferring the product into a machine edge heat preservation furnace of a low-pressure casting machine for production.
2.3 feed supplement
The using time of the deteriorated aluminum liquid is as follows: and (3) requiring that the strontium-containing aluminum liquid is used up within 3 hours, if the strontium-containing aluminum liquid is not used up within the specified time, detecting the strontium content during secondary production, and adding the Al-Sr10 intermediate alloy again according to the total mass of the residual aluminum liquid which is more than or equal to 0.008 percent and less than 0.01 percent.
2.4 Effect verification
The detection shows that the modification effect is shown in figure 2, and the mechanical property meets the requirement. Compared with the common strontium element with the addition amount of 0.02-0.10%, the effect is similar, but the production cost is obviously reduced.
Example 3
Referring to fig. 3, fig. 3 is a graph showing the effect of the present embodiment after modification for 1 hour at a modification temperature of 720 ℃ by using a modification process with a strontium element content of 0.0088% in the melt.
3.1 preparation of the Material
Taking Al-Sr10 flaky alterant with the thickness of 1mm, and baking and preheating the alterant at the furnace side, so that on one hand, the temperature of the alterant can be increased, and the influence of the addition of alterant materials on the temperature of a melt is reduced as much as possible; on the other hand, moisture can be eliminated, the safety of operators is guaranteed, and the product quality is improved.
3.2 addition of alterants
1) The input time of the strontium modifier is as follows: the strontium alterant is put into operation half an hour before the aluminum alloy liquid is produced and used (strontium alterative operation can be carried out during refining), and the temperature of the aluminum alloy liquid is kept at 680 ℃ during putting.
2) The input amount of the strontium modifier is as follows: the adding amount of strontium accounts for 0.008 percent of the total mass of the furnace burden.
3) And after the measurement meets the requirements, transferring the product into a machine edge heat preservation furnace of a low-pressure casting machine for production.
3.3 feed supplement
The using time of the deteriorated aluminum liquid is as follows: and (3) requiring that the strontium-containing aluminum liquid is used up within 3 hours, if the strontium-containing aluminum liquid is not used up within the specified time, detecting the strontium content during secondary production, and adding the Al-Sr10 intermediate alloy again according to the total mass of the residual aluminum liquid which is more than or equal to 0.008 percent and less than 0.01 percent.
3.4 Effect verification
The detection shows that the modification effect is shown in figure 3, and the mechanical property meets the requirement. Compared with the common strontium element with the addition amount of 0.02-0.10%, the effect is similar, but the production cost is obviously reduced.
Example 4:
referring to FIG. 4, FIG. 4 is a graph showing the effect of the present example after modification for 1 hour at a modification temperature of 720 ℃ by using a modification process with a strontium element content of 0.0071% in the melt.
4.1 preparation of the Material
The Al-Sr10 flaky alterant with the thickness of 1mm is taken, and is baked and preheated at the furnace edge, so that on one hand, the temperature of the alterant can be increased, and the influence of the addition of the alterant material on the temperature of a melt is reduced as much as possible; on the other hand, moisture can be eliminated, the safety of operators is guaranteed, and the product quality is improved.
4.2 addition of alterants
1) The input time of the strontium modifier is as follows: the strontium modifier is put into operation half an hour before the aluminum alloy liquid is produced and used (strontium modification operation can be carried out during refining), and the temperature of the aluminum alloy liquid is kept at 680 ℃ during putting.
2) The input amount of the strontium modifier is as follows: the addition of strontium accounts for 0.0071% of the total mass of the furnace burden.
3) And after the measurement meets the requirement, transferring the mixture into a machine edge heat preservation furnace of a low-pressure casting machine for production.
4.3 Effect verification
The detected deterioration effect is shown in figure 4, and the mechanical property is low. Compared with the common strontium element with the addition amount of 0.02-0.10%, the effect is poor.
Example 5:
referring to FIG. 5, FIG. 5 is a graph showing the effect of the present example after modification for 1 hour at a modification temperature of 720 ℃ by using a modification process with a strontium element content of 0.015% in the melt.
5.1 preparation of the Material
The Al-Sr10 flaky alterant with the thickness of 1mm is taken, and is baked and preheated at the furnace edge, so that on one hand, the temperature of the alterant can be increased, and the influence of the addition of the alterant material on the temperature of a melt is reduced as much as possible; on the other hand, moisture can be eliminated, the safety of operators is guaranteed, and the product quality is improved.
5.2 addition of modificators
1) The input time of the strontium modifier is as follows: the strontium modifier is put into operation half an hour before the aluminum alloy liquid is produced and used (strontium modification operation can be carried out during refining), and the temperature of the aluminum alloy liquid is kept at 680 ℃ during putting.
2) The input amount of the strontium modifier is as follows: the addition of strontium accounts for 0.015 percent of the total mass of the furnace burden.
3) And after the measurement meets the requirements, transferring the product into a machine edge heat preservation furnace of a low-pressure casting machine for production.
5.3 Effect verification
The detected deterioration effect is shown in figure 5, and the mechanical property is low. Compared with the common strontium element with the addition amount of 0.008% -0.010% the effect is similar, and the effect is not obviously improved.
The above description is of the preferred embodiment of the present invention, and the description of the specific embodiment is only for better understanding of the idea of the present invention. It will be appreciated by those skilled in the art that various modifications and equivalents may be made in accordance with the principles of the invention and are considered to be within the scope of the invention.
Claims (9)
1. A novel modification process of aluminum-silicon alloy is characterized in that a strontium modifier is added to form strontium modified aluminum liquid before the aluminum alloy liquid is produced and used, the adding amount of the strontium modifier accounts for 0.008% -0.01% of the total mass of furnace charge, and the strontium modifier is transferred to a machine-side heat preservation furnace of a casting machine for standby after being measured to meet the requirements.
2. A process for the new modification of Al-Si alloy as claimed in claim 1, wherein the strontium modifier is added half an hour before the production and use of the Al-Si alloy liquid, or during the refining, and the Sr content of the melt is measured after the refining.
3. A novel process for modifying an Al-Si alloy according to claim 1, wherein the temperature of the Al-Si alloy melt is maintained at 700. + -. 20 ℃ when the strontium modifier is added.
4. The process for newly modifying Al-Si alloy according to claim 3, wherein the aluminum alloy liquid temperature measurement is performed at the middle position of the depth dimension of the aluminum liquid.
5. A novel process for modifying an Al-si alloy as claimed in claim 1, wherein the strontium modifier is a 1mm thick sheet of Al-Sr10 master alloy.
6. A novel process for modifying Al-Si alloy according to claim 5, characterized in that the lamellar modifier is put in the furnace for baking and preheating before the charging, the baking and preheating can raise the modifier temperature, reduce the influence of modifier material addition on the melt temperature and eliminate moisture.
7. The new modification process of aluminum-silicon alloy as claimed in claim 1, wherein the strontium modified aluminum liquid is used up within a specified time, if the strontium modified aluminum liquid is not used up within the specified time, the strontium content needs to be detected again in the subsequent production, and the Al-Sr10 intermediate alloy flake modifier is added again, so that the total input amount of the strontium modifier accounts for 0.008% -0.01% of the total mass of the furnace burden.
8. A new process for modifying Al-Si alloy according to claim 7, wherein the strontium modified Al-Si alloy is used up within 3-3.5 hr.
9. The process of modifying an Al-Si alloy according to claim 7, wherein the step of re-testing the strontium content is performed by stirring the melt during the sampling test, wherein no splashing and entrainment of molten aluminum occurs during the stirring process, and wherein after the melt is uniform in composition, the sampling and testing are performed at the middle position of the melt depth to ensure the representativeness of the sampled product.
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| US20010031219A1 (en) * | 2000-02-28 | 2001-10-18 | Trond Sagstad | Master alloy for modification and grain refining of hypoeutectic and eutectic Al-Si foundry alloys |
| US20090297394A1 (en) * | 2004-12-02 | 2009-12-03 | Cast Centre Pty Ltd | Aluminium casting alloy |
| CN102994824A (en) * | 2012-12-04 | 2013-03-27 | 闫卫平 | Stable operation method for restraining deteriorated alusil alloy strontium from inhaling |
| CN103981386A (en) * | 2014-04-30 | 2014-08-13 | 苏州有色金属研究院有限公司 | Method for modification and refinement of hypoeutectic and eutectic Al-Si alloy |
| CN113059128A (en) * | 2021-03-16 | 2021-07-02 | 苏州优尼昂精密金属制造有限公司 | Die-casting aluminum alloy strontium modification process |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20010031219A1 (en) * | 2000-02-28 | 2001-10-18 | Trond Sagstad | Master alloy for modification and grain refining of hypoeutectic and eutectic Al-Si foundry alloys |
| US20090297394A1 (en) * | 2004-12-02 | 2009-12-03 | Cast Centre Pty Ltd | Aluminium casting alloy |
| CN102994824A (en) * | 2012-12-04 | 2013-03-27 | 闫卫平 | Stable operation method for restraining deteriorated alusil alloy strontium from inhaling |
| CN103981386A (en) * | 2014-04-30 | 2014-08-13 | 苏州有色金属研究院有限公司 | Method for modification and refinement of hypoeutectic and eutectic Al-Si alloy |
| CN113059128A (en) * | 2021-03-16 | 2021-07-02 | 苏州优尼昂精密金属制造有限公司 | Die-casting aluminum alloy strontium modification process |
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