CN102747244A - Method for compound modification refining of aluminum alloy cast structure - Google Patents

Method for compound modification refining of aluminum alloy cast structure Download PDF

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Publication number
CN102747244A
CN102747244A CN2012102148470A CN201210214847A CN102747244A CN 102747244 A CN102747244 A CN 102747244A CN 2012102148470 A CN2012102148470 A CN 2012102148470A CN 201210214847 A CN201210214847 A CN 201210214847A CN 102747244 A CN102747244 A CN 102747244A
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China
Prior art keywords
aluminium alloy
aluminum alloy
cast
duraluminum
refining
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CN2012102148470A
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Chinese (zh)
Inventor
梁宇
梁益龙
孙中源
余凌锋
石芷伊
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Guizhou University
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Guizhou University
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Priority to CN2012102148470A priority Critical patent/CN102747244A/en
Publication of CN102747244A publication Critical patent/CN102747244A/en
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Abstract

The invention discloses a method for compound modification refining of an aluminum alloy cast structure. The method comprises the following steps of 1, smelting, deslagging and degassing of an aluminum alloy to obtain aluminum alloy melt, wherein an aluminum alloy smelting temperature is in a range of 695 to 740 DEG C and a compound modification temperature is in a range of 500 to 740 DEG C, 2, adding Al-5Ti-1B as a refining agent into the aluminum alloy melt at a temperature of 695 to 740 DEG C, wherein the mass of the Al-5Ti-1B is 0.05 to 3% of the total mass of the aluminum alloy melt, and 3, applying a pulse current having frequency of 30 to 50Hz and electric current density of 100 to 1200A/cm<2> to the aluminum alloy melt with the refining agent for 30 to 500s, and after current supply is finished, naturally cooling the aluminum alloy melt for solidification to obtain a hard aluminum alloy ingot (casting) finished product having an even and fine cast structure. The method can effectively improve aluminum alloy cast structure morphology and alloy element segregation, has simple processes, can be operated conveniently, has a low preparation cost, and can obviously improve quality of the existing aluminum alloy ingot (casting) product.

Description

The method of composite modifying-refining duraluminum as-cast structure
Technical field
The present invention relates to a kind of method of composite modifying-refining duraluminum as-cast structure, belong to metal alloy manufacturing technology field.
Background technology
In the aluminium alloy casting process; The characteristics of solidifying according to ingot casting; Often inwardly form thick dendritic structure on ingot casting time top layer, remaining lower melting point liquid phase often is adsorbed between the dendritic structure, forms dendritic segregation; Cause all uneven phenomenon of tissue, composition of ingot casting, the performance of ingot casting is caused very big influence.On the one hand, because aluminium alloy cast ingot structural constituent inhomogeneous, make the stress level that bears in the ingot casting casting cycle descend, thermal stresses makes ingot casting or foundry goods deform, ftracture in ingot casting or the foundry goods process of cooling, causes serious industrial accident; On the other hand, even if the ingot casting moulding in next step deep-processing process, makes the ingot casting processing difficulties, scrap rate rises.So control ingot casting or foundry goods microtexture, the composition segregation that improves in the duraluminum has significant meaning.
The method that present stage is improved the metal structure segregation is divided into kind methods such as improving casting operation technology, chemical process, physical method substantially.Technologies such as the melt stirring of cast sections, melt time of repose, pouring temperature, poring rate all can have influence on the segregation degree of foundry goods; But along with the progress of material science, this kind only improvement on operating procedure can not satisfy the requirement of high efficiency industrialization and high-quality Al alloy; Chemical method is promptly added chemical element in the aluminium alloy smelting process; Control segregation phenomena through the rotten method of handling; Though this kind method can suppress segregation to a certain extent; But be based on lot of documents and practical application data, when smelt stage is added alterant, can bring new impurity element into to alloy to a certain extent, make foundry goods form new being mingled with; Physical method mainly concentrates on and alloy melt is applied magnetic field, ultrasonic wave, vibration etc. adds field intensity; Impel the inner solute element of alloy that the phenomenon of reallocation takes place; Thereby improve segregation; This kind method has obtained extensive concern in recent years, but in practical application since these technologies to appointed condition require, energy charge is high, also brought the cost problem of great number.Use pulsed current to improve aluminum alloy organization's technology and belong to the physical method category, proposed first early than just beginning the eighties in last century, and draw the conclusion that this kind technology can thinning microstructure, but its effect is very unobvious.
Each above-mentioned method all has its advantage, but its shortcoming is also arranged, and the aluminium liquid that brings like chemical treatment pollutes highly energy-consuming that physical method brought and equipment cost input etc.So the method for existing refinement duraluminum as-cast structure is not ideal.
Summary of the invention
The objective of the invention is: a kind of method that can effectively improve duraluminum as-cast structure pattern and alloying element segregation and the composite modifying-refining duraluminum as-cast structure that technology is simple, easy to operate, cost of manufacture is lower, quality product is higher is provided, to overcome the deficiency of prior art.
The present invention is achieved in that the method for a kind of composite modifying-refining duraluminum as-cast structure of the present invention does; This method comprises existing aluminium alloy cast ingot; And by usual manner carry out aluminium alloy smelting, remove slag, after the degasification the duraluminum of molten state; When duraluminum is molten state; The temperature that makes aluminium alloy melt is 695 ℃~740 ℃, adds into as the Al-5Ti-1B of fining agent by 0.05%~3% amount of aluminium alloy melt total mass then, and then the molten aluminium alloy that is added with fining agent being fed frequency is that 30~50Hz, current density are 100 A/cm 2~1200A/cm 2Pulsed current, be 30 seconds~500 seconds its conduction time, treats that energising is accomplished and after the molten aluminium alloy naturally cooling solidifies, can make the aluminium alloy cast ingot finished product of composite modifying-refining duraluminum as-cast structure.
Above-mentioned existing aluminium alloy cast ingot is that Al-Zn-Mg-Cu is hard aluminium alloy ingot casting or foundry goods.
Owing to adopted technique scheme, the tissue of the aluminium alloy cast ingot that obtains through the present invention is to be main with equiax crystal, and the dendritic segregation situation of its Cu, Fe element significantly alleviates.The results showed; After feeding electricimpulse and add fining agent, the present invention can suppress the growth of secondary dendrite; And can effectively improve the pattern of the cast structure of 7000 series alloys, its alloy matrix aluminum after the present invention handles mainly is uniform equiax crystal and subsphaeroidal crystal grain; Simultaneously, find that with the sample contrast of directly solidifying Cu and Fe elements segregation phenomenon are to a certain degree alleviated in the duraluminum of the present invention, especially the Fe element distributes and is tending towards evenly, and this helps improving the properties for follow of duraluminum very much.The present invention is through serial fundamental research; Through process method optimization; With its compound use; Given full play to chemical treatment and physical method advantage separately, greatly reduced demand, obtained positive effect (relatively) aspect control of duraluminum as-cast structure and the homogenization of composition simultaneously referring to accompanying drawing to alterant and electric field energy.So; The present invention compared with prior art; The present invention not only has the advantage that can effectively improve aluminium alloy cast ingot (foundry goods) as-cast structure pattern and alloying element segregation; But also have advantages such as technology is simple, easy to operate, cost of manufacture is lower, adopt the present invention can improve existing aluminium alloy cast ingot quality product significantly.
Description of drawings
Fig. 1 is existing 7075 duraluminums and the grain morphology of the as-cast structure of 7075 duraluminums of handling through the present invention changes comparison diagram; (a) among its Fig. 1 is the solidified structure figure of aluminium alloy melt after without any processing, (b) for adopting 7075 aluminium alloy melt solidified structure figure after the present invention handles;
Fig. 2 is the distribution diagram of element of the face scan image 800X of existing 7075 duraluminum as-cast structures; (a) among its Fig. 2 is scanning field of view figure; (b) being the distribution plan of Al element, (c) is the distribution plan of Zn element, (d) is the distribution plan of Mg element; (e) being the distribution plan of Cu element, (f) is the distribution plan of Fe element;
Fig. 3 is the distribution diagram of element of the face scan image 800X of the 7075 duraluminum as-cast structures handled through the present invention; (a) among its Fig. 3 is scanning field of view figure; (b) being the distribution plan of Al element, (c) is the distribution plan of Zn element, (d) is the distribution plan of Mg element; (e) being the distribution plan of Cu element, (f) is the distribution plan of Fe element.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is done further to say in detail.
Embodiments of the invention: the present invention is a kind of method that adopts chemical method and physics method composite modifying-refining aluminium alloy cast ingot as-cast structure; Can be suitable for all hard aluminium aluminium alloy cast ingot productions of the prior art; But preferably be used for the hard aluminium alloy ingot production that Al-Zn-Mg-Cu of the prior art is; During embodiment of the present invention; Earlier to existing aluminium alloy cast ingot or foundry goods (being preferably existing Al-Zn-Mg-Cu is hard aluminium alloy ingot casting or foundry goods) by traditional method carry out melting, remove slag, after the degasification the duraluminum of molten state; And the temperature of aluminium alloy melt that makes this molten state is in 695 ℃~740 ℃ intervals; To add as the Al-5Ti-1B of fining agent simultaneously in the aluminium alloy melt of molten state into, the add-on of its Al-5Ti-1B is added by 0.05%~3% amount of aluminium alloy melt total mass, is that 30~50Hz, current density are 100 A/cm to feeding frequency in the molten aluminium alloy that is added with fining agent then 2~1200A/cm 2Pulsed current, be 30 seconds~500 seconds its conduction time, treats that energising is accomplished and after the molten aluminium alloy naturally cooling solidifies, can obtain even, tiny aluminium alloy cast ingot of as-cast structure or casting finished products.
In aforesaid method, aluminium alloy melt temperature of fusion scope of the present invention is 695 ℃~740 ℃, and the TR of its composite inoculating is 500 ℃~740 ℃.
(b) among Fig. 1 and Fig. 3 are the metallographs that adopts 7075 aluminium alloy cast ingots of explained hereafter of the present invention; From figure, can find out significantly; To a certain degree alleviated through Cu and Fe elements segregation phenomenon in the duraluminum after the present invention's processing; Especially the Fe element distributes and to be tending towards evenly, and the tissue of its aluminium alloy cast ingot is to be main with equiax crystal, and the dendritic segregation situation of its Cu, Fe element significantly alleviates.

Claims (2)

1. the method for a composite modifying-refining duraluminum as-cast structure; Comprise existing aluminium alloy cast ingot; And by usual manner carry out aluminium alloy smelting, remove slag, after the degasification the duraluminum of molten state; It is characterized in that: when duraluminum is molten state; The temperature that makes aluminium alloy melt is 695 ℃~740 ℃, adds into as the Al-5Ti-1B of fining agent by 0.05%~3% amount of aluminium alloy melt total mass then, and then the molten aluminium alloy that is added with fining agent being fed frequency is that 30~50Hz, current density are 100 A/cm 2~1200A/cm 2Pulsed current, be 30 seconds~500 seconds its conduction time, treats that energising is accomplished and after the molten aluminium alloy naturally cooling solidifies, can make the aluminium alloy cast ingot finished product of composite modifying-refining duraluminum as-cast structure.
2. the method for composite modifying-refining duraluminum as-cast structure according to claim 1 is characterized in that: said existing aluminium alloy cast ingot is that Al-Zn-Mg-Cu is hard aluminium alloy ingot casting or foundry goods.
CN2012102148470A 2012-06-27 2012-06-27 Method for compound modification refining of aluminum alloy cast structure Pending CN102747244A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103643088A (en) * 2013-11-29 2014-03-19 哈尔滨工业大学 Alterant for ADC12 aluminum alloy and alteration method of alloy
CN104141101A (en) * 2013-05-10 2014-11-12 贵州大学 Pulse current assisted aluminum alloy homogenization heat treatment method
CN107058819A (en) * 2017-06-22 2017-08-18 安徽银力铸造有限公司 A kind of Modification Manners of Casting Al-Si magnesium automotive hub alloy
CN108165785A (en) * 2017-12-29 2018-06-15 西南铝业(集团)有限责任公司 A kind of aluminum grain refinement method

Citations (1)

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Publication number Priority date Publication date Assignee Title
CN102367525A (en) * 2011-10-10 2012-03-07 陈伟军 Preparation method of cast aluminum alloy

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CN102367525A (en) * 2011-10-10 2012-03-07 陈伟军 Preparation method of cast aluminum alloy

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104141101A (en) * 2013-05-10 2014-11-12 贵州大学 Pulse current assisted aluminum alloy homogenization heat treatment method
CN104141101B (en) * 2013-05-10 2017-02-22 贵州大学 Pulse current assisted aluminum alloy homogenization heat treatment method
CN103643088A (en) * 2013-11-29 2014-03-19 哈尔滨工业大学 Alterant for ADC12 aluminum alloy and alteration method of alloy
CN107058819A (en) * 2017-06-22 2017-08-18 安徽银力铸造有限公司 A kind of Modification Manners of Casting Al-Si magnesium automotive hub alloy
CN108165785A (en) * 2017-12-29 2018-06-15 西南铝业(集团)有限责任公司 A kind of aluminum grain refinement method

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Application publication date: 20121024