CN107058819A - A kind of Modification Manners of Casting Al-Si magnesium automotive hub alloy - Google Patents

A kind of Modification Manners of Casting Al-Si magnesium automotive hub alloy Download PDF

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Publication number
CN107058819A
CN107058819A CN201710480822.8A CN201710480822A CN107058819A CN 107058819 A CN107058819 A CN 107058819A CN 201710480822 A CN201710480822 A CN 201710480822A CN 107058819 A CN107058819 A CN 107058819A
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China
Prior art keywords
casting
magnesium
alloy
automotive hub
modification manners
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CN201710480822.8A
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Chinese (zh)
Inventor
谷和文
丁思潮
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ANHUI YINLI FOUNDRY Co Ltd
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ANHUI YINLI FOUNDRY Co Ltd
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Priority to CN201710480822.8A priority Critical patent/CN107058819A/en
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    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C21/00Alloys based on aluminium
    • C22C21/02Alloys based on aluminium with silicon as the next major constituent
    • C22C21/04Modified aluminium-silicon alloys
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C1/00Making alloys
    • C22C1/02Making alloys by melting
    • C22C1/026Alloys based on aluminium
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C1/00Making alloys
    • C22C1/02Making alloys by melting
    • C22C1/03Making alloys by melting using master alloys
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C1/00Making alloys
    • C22C1/06Making alloys with the use of special agents for refining or deoxidising

Abstract

The invention discloses a kind of Modification Manners of Casting Al-Si magnesium automotive hub alloy, the present invention is using impulse electric field combination mechanical agitation, the Modification Manners of supersonic oscillations, the solidified structure of Casting Al-Si magnesium automotive hub alloy is significantly refined, mechanical property is significantly improved, and its effect is better than single impulse electric field processing.The pattern of the Eutectic Silicon in Al-Si Cast Alloys of Casting Al-Si magnesium automotive hub alloy produced by the present invention, size are significantly improved, Morphology of Eutectic Silicon in Al-Si Foundry Alloys is changed into tiny threadiness or lamellar from thick needle-like, sheet, and more than 30% and more than 120% has been respectively increased in the more conventional Metamorphism treatment of tensile strength and elongation of alloy.

Description

A kind of Modification Manners of Casting Al-Si magnesium automotive hub alloy
Technical field
The present invention relates to a kind of Modification Manners of Casting Al-Si magnesium automotive hub alloy, belong to casting technology field.
Background technology
Casting Al-Si magnesium alloy, which is one, has the cast aluminium alloy gold of outstanding combination property, and it not only has casting well Make performance(Good fluidity, linear shrinkage is small, air-tightness is good, without hot cracking tendency), it may be cast as thin-walled and complex-shaped casting, and Higher mechanical strength, good plasticity and high impact toughness can reach by heat treatment, therefore become automotive casting aluminium wheel The preferred material of hub.
When Si mass percent is more than 6% in Casting Al-Si magnesium alloy, Eutectic Silicon in Al-Si Cast Alloys is in thick needle-like, sheet, and alloy holds Easily ftractureed along the border of crystal grain or en plaque silicon body and form crackle, alloy is become fragile, cause the mechanical property of alloy especially Toughness is reduced, accordingly, it would be desirable to which to carrying out Metamorphism treatment, to improve silicon phase morphology, crystal grain thinning improves its mechanical property.At present, It is before the cast of Casting Al-Si magnesium automotive hub alloy to use chemometamorphism method more, Eutectic Silicon in Al-Si Cast Alloys tissue is gone bad and improves them and organizes While form, new impurity is but introduced to aluminium alloy.
Electric Pulse Treatment is a kind of novel coagulation effect mechanism, and it improves solution by applying impulse electric field to molten metal Structure, and then refining alloy solidified structure.The simple technical method, flexibly, and need not add extra alterant so that There is no the addition of other elements in production process, it is to avoid the pollution of molten metal, therefore, using Electric Pulse Treatment technology to metal Material process, can both reach the purpose of thinning metal solidification texture, will not cause any pollution to metal again, thus with weight The researching value wanted.The current document report for being related to Electric Pulse Treatment technology applied to alusil alloy, but single electricity The need for pulse Metamorphism treatment can not meet Solidification Structure refinement.In order to significantly refine Casting Al-Si magnesium automotive hub The solidified structure of alloy and its mechanical property is significantly improved, the present invention develops a kind of impulse electric field combination mechanical agitation, ultrasound The Modification Manners of ripple vibration.
The content of the invention
The invention provides a kind of Modification Manners of Casting Al-Si magnesium automotive hub alloy.The present invention uses impulse electric field knot Mechanical agitation, the Modification Manners of supersonic oscillations are closed, the solidified structure of Casting Al-Si magnesium automotive hub alloy has significantly been refined, from And significantly improve its mechanical property.
To achieve the above object, the present invention is adopted the following technical scheme that:
A kind of Modification Manners of Casting Al-Si magnesium automotive hub alloy, it is characterised in that comprise the following steps:
(1)According to the alloying element of following mass percent:Si 6.9-7.8、Mg 0.3-0.6、Cu≤0.2、Mn≤0.1、Fe ≤ 0.15, Zn≤0.1, Ti≤0.2, surplus are that Al carries out burdening calculation;
(2)Melting furnace is preheated into 1-2h at 150-200 DEG C, 660-690 DEG C is then heated to, added according to the amount of burdening calculation Aluminium ingot melts, then is warming up to 680-720 DEG C, by the amount addition Al-Si alloys of burdening calculation, after after alloy melting, by proportioning meter The amount of calculation adds magnesium rod;770-810 DEG C is then heated to, refining agent refining 10-15min is added, skims, stand after 15-20min Carry out Metamorphism treatment:First adjustment temperature stirs 20-30min, then adjust to 740-780 DEG C under 2000-4000r/min rotating speed Whole temperature handles 30-60s to 765-805 DEG C in the case where pulse voltage is the impulse electric field that 300-500V, pulse frequency are 4-6Hz, Finally adjustment temperature is to 750-790 DEG C, the supersonic oscillations 10-20min under 300-400W power;Used after the completion of Metamorphism treatment Mixed gas carries out refinery by de-gassing, and gas pressure is 50-100kpa, and gas flow is 1.5-2.0m3/ min, refines 5-10min, Skim, stand and start cast after 3-6min;
(3)Metal pattern die is preheating to 180-220 DEG C before cast, then the casting ingot-forming at a temperature of 730-760 DEG C.
The purity of the aluminium ingot is more than 99.99%.
Si weight/mass percentage composition is 32-36% in the Al-Si alloys.
The refining agent is carbon trichloride, and the addition of carbon trichloride is the 0.5-1% of aluminium alloy quality.
The mixed gas is according to volume ratio 3-5 by argon gas, nitrogen, carbon dioxide:2-4:1-3 is mixed.
Beneficial effects of the present invention:
The present invention is closed using impulse electric field combination mechanical agitation, the Modification Manners of supersonic oscillations, Casting Al-Si magnesium automotive hub The solidified structure of gold is significantly refined, and mechanical property is significantly improved, and its effect is better than single impulse electric field processing.The present invention is made The pattern of Eutectic Silicon in Al-Si Cast Alloys of Casting Al-Si magnesium automotive hub alloy, size significantly improve, Morphology of Eutectic Silicon in Al-Si Foundry Alloys is by thick needle-like, piece Shape is changed into tiny threadiness or lamellar, and the more conventional Metamorphism treatment of tensile strength and elongation of alloy has been respectively increased 30% Above with more than 120%.
Embodiment
Embodiment 1
A kind of Modification Manners of Casting Al-Si magnesium automotive hub alloy, it is characterised in that comprise the following steps:
(1)According to the alloying element of following mass percent:Si 6.9-7.8、Mg 0.3-0.6、Cu≤0.2、Mn≤0.1、Fe ≤ 0.15, Zn≤0.1, Ti≤0.2, surplus are that Al carries out burdening calculation;
(2)Melting furnace is preheated into 2h at 150 DEG C, 660 DEG C are then heated to, aluminium ingot fusing is added according to the amount of burdening calculation, 680 DEG C are warming up to again, Al-Si alloys are added by the amount of burdening calculation, and after after alloy melting, magnesium is added by the amount of burdening calculation Bar;770 DEG C are then heated to, refining agent refining 15min is added, skims, Metamorphism treatment is carried out after standing 15min:First adjust temperature Degree stirs 30min to 740 DEG C under 2000r/min rotating speed, then adjusts temperature to 765 DEG C, is 300V, arteries and veins in pulse voltage Rush under the impulse electric field that frequency is 4Hz and handle 60s, finally adjust temperature to 750 DEG C, the supersonic oscillations under 300W power 20min;Refinery by de-gassing is carried out after the completion of Metamorphism treatment with mixed gas, gas pressure is 50kpa, and gas flow is 1.5m3/ Min, refines 10min, skims, and stands and starts cast after 3min;
(3)Metal pattern die is preheating to 180 DEG C before cast, then the casting ingot-forming at a temperature of 730 DEG C.
The purity of the aluminium ingot is more than 99.99%.
Si weight/mass percentage composition is 32% in the Al-Si alloys.
The refining agent is carbon trichloride, and the addition of carbon trichloride is the 0.5% of aluminium alloy quality.
The mixed gas is according to volume ratio 3 by argon gas, nitrogen, carbon dioxide:2:1 mixes.
Embodiment 2
A kind of Modification Manners of Casting Al-Si magnesium automotive hub alloy, it is characterised in that comprise the following steps:
(1)According to the alloying element of following mass percent:Si 6.9-7.8、Mg 0.3-0.6、Cu≤0.2、Mn≤0.1、Fe ≤ 0.15, Zn≤0.1, Ti≤0.2, surplus are that Al carries out burdening calculation;
(2)Melting furnace is preheated into 1.5h at 180 DEG C, 675 DEG C are then heated to, adding aluminium ingot according to the amount of burdening calculation melts Change, then be warming up to 700 DEG C, by the amount addition Al-Si alloys of burdening calculation, after after alloy melting, by the amount addition of burdening calculation Magnesium rod;795 DEG C are then heated to, refining agent refining 12min is added, skims, Metamorphism treatment is carried out after standing 18min:First adjust Temperature stirs 25min to 760 DEG C under 3000r/min rotating speed, then adjusts temperature to 785 DEG C, pulse voltage be 400V, Pulse frequency adjusts temperature to handle 45s under 5Hz impulse electric field, finally to 770 DEG C, the supersonic oscillations under 350W power 15min;Refinery by de-gassing is carried out after the completion of Metamorphism treatment with mixed gas, gas pressure is 75kpa, and gas flow is 1.8m3/ Min, refines 7min, skims, and stands and starts cast after 3-6min;
(3)Metal pattern die is preheating to 200 DEG C before cast, then the casting ingot-forming at a temperature of 745 DEG C.
The purity of the aluminium ingot is more than 99.99%.
Si weight/mass percentage composition is 34% in the Al-Si alloys.
The refining agent is carbon trichloride, and the addition of carbon trichloride is the 0.7% of aluminium alloy quality.
The mixed gas is according to volume ratio 4 by argon gas, nitrogen, carbon dioxide:3:2 mix.
Embodiment 3
A kind of Modification Manners of Casting Al-Si magnesium automotive hub alloy, it is characterised in that comprise the following steps:
(1)According to the alloying element of following mass percent:Si 6.9-7.8、Mg 0.3-0.6、Cu≤0.2、Mn≤0.1、Fe ≤ 0.15, Zn≤0.1, Ti≤0.2, surplus are that Al carries out burdening calculation;
(2)Melting furnace is preheated into 1h at 200 DEG C, 690 DEG C are then heated to, aluminium ingot fusing is added according to the amount of burdening calculation, 720 DEG C are warming up to again, Al-Si alloys are added by the amount of burdening calculation, and after after alloy melting, magnesium is added by the amount of burdening calculation Bar;810 DEG C are then heated to, refining agent refining 10min is added, skims, Metamorphism treatment is carried out after standing 20min:First adjust temperature Degree stirs 20min to 780 DEG C under 4000r/min rotating speed, then adjusts temperature to 805 DEG C, is 500V, arteries and veins in pulse voltage Rush under the impulse electric field that frequency is 6Hz and handle 30s, finally adjust temperature to 790 DEG C, the supersonic oscillations under 400W power 10min;Refinery by de-gassing is carried out after the completion of Metamorphism treatment with mixed gas, gas pressure is 100kpa, and gas flow is 2.0m3/ Min, refines 5min, skims, and stands and starts cast after 6min;
(3)Metal pattern die is preheating to 220 DEG C before cast, then the casting ingot-forming at a temperature of 760 DEG C.
The purity of the aluminium ingot is more than 99.99%.
Si weight/mass percentage composition is 32-36% in the Al-Si alloys.
The refining agent is carbon trichloride, and the addition of carbon trichloride is the 1% of aluminium alloy quality.
The mixed gas is according to volume ratio 5 by argon gas, nitrogen, carbon dioxide:4:3 mix.

Claims (5)

1. a kind of Modification Manners of Casting Al-Si magnesium automotive hub alloy, it is characterised in that comprise the following steps:
(1)According to the alloying element of following mass percent:Si 6.9-7.8、Mg 0.3-0.6、Cu≤0.2、Mn≤0.1、Fe ≤ 0.15, Zn≤0.1, Ti≤0.2, surplus are that Al carries out burdening calculation;
(2)Melting furnace is preheated into 1-2h at 150-200 DEG C, 660-690 DEG C is then heated to, added according to the amount of burdening calculation Aluminium ingot melts, then is warming up to 680-720 DEG C, by the amount addition Al-Si alloys of burdening calculation, after after alloy melting, by proportioning meter The amount of calculation adds magnesium rod;770-810 DEG C is then heated to, refining agent refining 10-15min is added, skims, stand after 15-20min Carry out Metamorphism treatment:First adjustment temperature stirs 20-30min, then adjust to 740-780 DEG C under 2000-4000r/min rotating speed Whole temperature handles 30-60s to 765-805 DEG C in the case where pulse voltage is the impulse electric field that 300-500V, pulse frequency are 4-6Hz, Finally adjustment temperature is to 750-790 DEG C, the supersonic oscillations 10-20min under 300-400W power;Used after the completion of Metamorphism treatment Mixed gas carries out refinery by de-gassing, and gas pressure is 50-100kpa, and gas flow is 1.5-2.0m3/ min, refines 5-10min, Skim, stand and start cast after 3-6min;
(3)Metal pattern die is preheating to 180-220 DEG C before cast, then the casting ingot-forming at a temperature of 730-760 DEG C.
2. the Modification Manners of a kind of Casting Al-Si magnesium automotive hub alloy according to claim 1, it is characterised in that described The purity of aluminium ingot is more than 99.99%.
3. the Modification Manners of a kind of Casting Al-Si magnesium automotive hub alloy according to claim 1, it is characterised in that described Si weight/mass percentage composition is 32-36% in Al-Si alloys.
4. the Modification Manners of a kind of Casting Al-Si magnesium automotive hub alloy according to claim 1, it is characterised in that described Refining agent is carbon trichloride, and the addition of carbon trichloride is the 0.5-1% of aluminium alloy quality.
5. the Modification Manners of a kind of Casting Al-Si magnesium automotive hub alloy according to claim 1, it is characterised in that described Mixed gas is according to volume ratio 3-5 by argon gas, nitrogen, carbon dioxide:2-4:1-3 is mixed.
CN201710480822.8A 2017-06-22 2017-06-22 A kind of Modification Manners of Casting Al-Si magnesium automotive hub alloy Pending CN107058819A (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113234970A (en) * 2021-05-08 2021-08-10 昆明理工大学 Er-containing high-strength and high-toughness cast aluminum-silicon alloy and preparation method thereof

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CN104498787A (en) * 2014-12-24 2015-04-08 辽宁工业大学 Preparation method of in-situ synthesized Mg2Si particle enhanced aluminum matrix composite

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113234970A (en) * 2021-05-08 2021-08-10 昆明理工大学 Er-containing high-strength and high-toughness cast aluminum-silicon alloy and preparation method thereof

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