CN103572081A - Casting process of 7475 aluminium alloy slab ingot - Google Patents
Casting process of 7475 aluminium alloy slab ingot Download PDFInfo
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- CN103572081A CN103572081A CN201310581913.2A CN201310581913A CN103572081A CN 103572081 A CN103572081 A CN 103572081A CN 201310581913 A CN201310581913 A CN 201310581913A CN 103572081 A CN103572081 A CN 103572081A
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Abstract
The invention relates to a casting process for a 7475 aluminium alloy slab ingot. By the control to chemical components, regulation of the casting stress, improvement on melt purity, strengthening of grain refinement and the like, the defects of cracks and loosening of the 7475 aluminium alloy slab ingot in the casting process are prevented.
Description
Technical field
The invention belongs to aluminium alloy casting technology field, be specifically related to a kind of 7475 founding aluminium alloy slab ingots.
Background technology
7475 aluminium alloys are used for producing aerospace component, and this structural part requires to have high strength, high tenacity, antifatigue, the performance such as corrosion-resistant, and its end article requires to check through A level flaw detection and fracture oxide film.In order to guarantee the performance and used life of alloy product, in the founding stage, except requiring good cast form, also should strictly control its principal constituent, reduce foreign matter content, guarantee the high clarity of metal.
During current 7475 aluminium alloy flat bloom casting, easily there is crackle, rarefaction defect.
Summary of the invention
The object of the present invention is to provide a kind of 7475 founding aluminium alloy slab ingots, comprise following steps:
(1) batching, is used this alloy one-level waste material≤30%, fine aluminium ingot >=30%, Cu, Mg, Zn required in alloy add with form of pure metal, and Cr adds with Al-Cr master alloy form, does not allow to use complexification material and additive, during batching, control Si<0.25wt%, Fe<0.1wt%, Cu:1.3-1.5wt%, Mn≤0.20wt%, Zn:5.2-5.8wt%, Mg:2.3-2.8wt%, Ti≤0.10wt%, Cr content is allocated into by middle limit;
(2) melting, adopts electric furnace to haul oneself willingly into solid material fusing mode, 740 ℃-750 ℃ of smelting temperatures, and smelting time is no more than 40 minutes;
(3) refining, leads stokehold to twice prepurging of standing furnace, while leading stove, at the chute of coming out of the stove, adds aluminum grain refiner, and melt adds refining agent and uses argon gas refining 30 minutes, standing 20 minutes after importing standing furnace;
(4) casting, casting temp is controlled at 700-730 ℃, in castingprocesses, with degasifying device, carry out online degasification, with ceramic plate, filter, and sow online Al-5Ti-B silk crystal grain thinning, the temperature field in castingprocesses in balance ingot casting, make it the side of ingot casting corresponding position and wide temperature distribution even as far as possible, in castingprocesses, guarantee uniformly distributing liquid stream, guarantee that wide both sides water-cooled is even.
Adjust the ratio of wide and side water coolant, the cooling water pressure that as far as possible makes the cooling water pressure of side be less than wide, makes the contraction of wide and side approach as far as possible synchronous.
The present invention is by controlling chemical composition, adjust casting stress, improve melt purification, strengthening grain refining, limited crackle, the rarefaction defect of occurring while having prevented 7475 aluminium alloy flat blooms casting.
Embodiment
(1) batching, is used this alloy one-level waste material≤30%, fine aluminium ingot >=30%, Cu, Mg, Zn required in alloy add with form of pure metal, and Cr adds with Al-Cr master alloy form, does not allow to use complexification material and additive, during batching, control Si<0.25wt%, Fe<0.1wt%, Cu:1.3-1.5wt%, Mn≤0.20wt%, Zn:5.2-5.8wt%, Mg:2.3-2.8wt%, Ti≤0.10wt%, Cr content is allocated into by middle limit;
Impurity F e can form some coarsening compounds with other elements, affects intensity and the plasticity of alloy, and the negative interaction of Si is larger than Fe's, along with Si content increases, the red brittleness of alloy is increased sharply, and therefore controls Fe<0.1wt%, Si<0.25wt%;
By test of many times, along with Mg content increases crackle reduction in propensity.Therefore, little to performance impact in the situation that, should improve as far as possible Mg content, warp considers the requirement of product end properties, castability, and Mg is controlled to 2.3～2.8wt%;
Cu element can significantly increase the red brittleness of alloy, and when Cu>1.5wt%, red brittleness is larger, and therefore, in the situation that guaranteeing alloy strength, Cu content should be low as far as possible, and Cu is controlled to 1.3～1.5wt%.
(2) melting, adopts electric furnace to haul oneself willingly into solid material fusing mode, 740 ℃-750 ℃ of smelting temperatures, and smelting time is no more than 40 minutes;
(3) refining, leads stokehold to twice prepurging of standing furnace, while leading stove, at the chute of coming out of the stove, adds aluminum grain refiner, and melt adds refining agent and uses argon gas refining 30 minutes, standing 20 minutes after importing standing furnace;
(4) casting, casting temp is controlled at 700-730 ℃, in castingprocesses, with degasifying device, carry out online degasification, with ceramic plate, filter, and sow online Al-5Ti-B silk crystal grain thinning, the temperature field in castingprocesses in balance ingot casting, make it the side of ingot casting corresponding position and wide temperature distribution even as far as possible, in castingprocesses, guarantee uniformly distributing liquid stream, guarantee that wide both sides water-cooled is even.
Adjust the ratio of wide and side water coolant, the cooling water pressure that as far as possible makes the cooling water pressure of side be less than wide, makes the contraction of wide and side approach as far as possible synchronous.
The ingot casting flawless defect making with above-mentioned 7475 founding aluminium alloy slab ingots.At this alloy flat bloom, take up an official post and get a test piece and carry out low power, mirco structure, mechanical property inspection.
Metallographic structure:
Macrostructure is not found slag inclusion, defects i.e.cracks on macro coupon, and ingot casting grain fineness number is less than one-level.
Mirco structure has no grain-boundary crack defect in high power photo, still has part second-phase tissue after homogenizing cast ingot in mirco structure.
Mechanical property:
The yield strength of ingot casting, tensile strength mean value are higher, and each position data are more or less the same, and illustrate that each position crystallization velocity is more even.Average elongation 17%, illustrates that ingot casting plasticity is better; But each some difference of position plasticity, removes the impact of analytical error, and the plasticity of limit portion is better on the whole.
The inspection of flaw detection yield rate:
Through 7475 alloy flat blooms are carried out to the defect detecting test of A level, do not find flaw detection waste product.
Fracture oxide film checks:
The goods that alloy slab ingot is processed into carry out the inspection of fracture oxide film, find that there is oxide film defect on part goods.This defect irregularities on ingot casting is not the head or tail portion that concentrates on ingot casting.Goods examination of fracture oxide film waste product is about 10%.
Claims (2)
1.7475 founding aluminium alloy slab ingots, is characterized in that, comprise following steps:
(1) batching, is used this alloy one-level waste material≤30%, fine aluminium ingot >=30%, Cu, Mg, Zn required in alloy add with form of pure metal, and Cr adds with Al-Cr master alloy form, does not allow to use complexification material and additive, during batching, control Si<0.25wt%, Fe<0.1wt%, Cu:1.3-1.5wt%, Mn≤0.20wt%, Zn:5.2-5.8wt%, Mg:2.3-2.8wt%, Ti≤0.10wt%, Cr content is allocated into by middle limit;
(2) melting, adopts electric furnace to haul oneself willingly into solid material fusing mode, 740 ℃-750 ℃ of smelting temperatures, and smelting time is no more than 40 minutes;
(3) refining, leads stokehold to twice prepurging of standing furnace, while leading stove, at the chute of coming out of the stove, adds aluminum grain refiner, and melt adds refining agent and uses argon gas refining 30 minutes, standing 20 minutes after importing standing furnace;
(4) casting, casting temp is controlled at 700-730 ℃, in castingprocesses, with degasifying device, carry out online degasification, with ceramic plate, filter, and sow online Al-5Ti-B silk crystal grain thinning, the temperature field in castingprocesses in balance ingot casting, make it the side of ingot casting corresponding position and wide temperature distribution even as far as possible, in castingprocesses, guarantee uniformly distributing liquid stream, guarantee that wide both sides water-cooled is even.
2. 7475 founding aluminium alloy slab ingots according to claim 1, it is characterized in that, step (4) is cast, and also comprises the ratio of wide of adjustment and side water coolant, the cooling water pressure that makes the cooling water pressure of side be less than wide, makes the contraction of wide and side approach as far as possible synchronous.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310581913.2A CN103572081A (en) | 2013-11-20 | 2013-11-20 | Casting process of 7475 aluminium alloy slab ingot |
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| CN201310581913.2A CN103572081A (en) | 2013-11-20 | 2013-11-20 | Casting process of 7475 aluminium alloy slab ingot |
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| CN103572081A true CN103572081A (en) | 2014-02-12 |
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| CN201310581913.2A Pending CN103572081A (en) | 2013-11-20 | 2013-11-20 | Casting process of 7475 aluminium alloy slab ingot |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107900304A (en) * | 2017-11-30 | 2018-04-13 | 重庆嘉萌鸿业科技有限公司 | A kind of aluminium ingot blank-making technology |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1264903A2 (en) * | 2001-06-07 | 2002-12-11 | Bayerische Motoren Werke Aktiengesellschaft | Refining of aluminium casting alloys by boron addition |
| CN1900336A (en) * | 2006-07-27 | 2007-01-24 | 中山市金胜铝业有限公司 | Aluminum alloy pipe for high purity and high precision light sensitive drum base material and producing method |
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2013
- 2013-11-20 CN CN201310581913.2A patent/CN103572081A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1264903A2 (en) * | 2001-06-07 | 2002-12-11 | Bayerische Motoren Werke Aktiengesellschaft | Refining of aluminium casting alloys by boron addition |
| CN1900336A (en) * | 2006-07-27 | 2007-01-24 | 中山市金胜铝业有限公司 | Aluminum alloy pipe for high purity and high precision light sensitive drum base material and producing method |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107900304A (en) * | 2017-11-30 | 2018-04-13 | 重庆嘉萌鸿业科技有限公司 | A kind of aluminium ingot blank-making technology |
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Application publication date: 20140212 |