CN104607463A - Novel method for healing center porosity of cast-rolled 5052 aluminum alloy - Google Patents
Novel method for healing center porosity of cast-rolled 5052 aluminum alloy Download PDFInfo
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- CN104607463A CN104607463A CN201410747951.5A CN201410747951A CN104607463A CN 104607463 A CN104607463 A CN 104607463A CN 201410747951 A CN201410747951 A CN 201410747951A CN 104607463 A CN104607463 A CN 104607463A
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- healing
- aluminum alloy
- center porosity
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
- B21B1/24—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process
- B21B1/28—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process by cold-rolling, e.g. Steckel cold mill
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
Abstract
The invention discloses a novel method for healing center porosity of a cast-rolled 5052 aluminum alloy. The novel method comprises the steps that the aluminum alloy is subjected to pressure-casting treatment through a cold rolling method, wherein the pressing-down rate of the aluminum alloy ranges from 20% to 70%; the cold-rolled aluminum product is subjected to thermal annealing healing treatment, wherein the annealing temperature of the cold-rolled aluminum product ranges from 150 DEG C to 500 DEG C, and the thermal treatment time of the cold-rolled aluminum product ranges from one hour to ten hours. By means of the novel method, healing of center porosity of aluminum alloy materials with the mark number of 5052 can be realized, and the method is also suitable for treating and eliminating center porosity of gold, silver, copper, iron, tin, lead, aluminum and alloys thereof by conducting thermal healing after cold rolling thereon. According to the novel method, the process is short, energy is saved, cost is low, plate-strip billets which have various widths and are made of various alloys can be produced according to market demands, and the novel method is particularly suitable for production of small-batch products with various specifications.
Description
Technical field
the present invention relates to a kind of 5052 aluminum alloy core loosen healing a kind of method, especially a kind of casting 5052 aluminum alloy core loosen healing a kind of new method.
Background technology
it is higher that 5052 aluminium alloys have intensity, good welding performance, decay resistance is strong, and extruding and the various forms of pressure processing such as forging and stamping can be rolled, be therefore widely used in fuel tanker, oil pipe and vehicular traffic, the sheet metal component of boats and ships, instrument cabinet, plasm TV backboard and shutter etc.Generally, the blank that 5052 products adopt is that Hot rolling is produced, but the Hot rolling production cycle is long, production cost is high.Have that operation is short, energy-conservation, the feature of advantage of lower cost in contrast than, continuous casting and rolling, can also configure by the market demand, the strip blank of various width and alloy can be produced, be particularly suitable for the production of small lot plurality of specifications product.Just because of the distinctive advantage of casting-rolling technology, be still well worth doing at production high-quality Al foil blank and moderate strength alloy sheets this respect.Strengthening the research and development dynamics adopting Aluminum sheets Twin roll continuous casting technology production alloy aluminum strip, is the only way of casting-rolling technology development.At present, the domestic Aluminum sheets Twin roll continuous casting machine of China can only be used for the production of commercial-purity aluminium and 3003 alloy Casting Rolled Sheets substantially, can't carry out the production of 5052 alloy Casting Rolled Sheets.Trace it to its cause, except the limitation of Aluminum sheets Twin roll continuous casting technology self, 5052 aluminium alloy self characters are also key factors.Because its solid-liquid phase line temperature range of 5052 aluminium alloys wider (reaching 42 DEG C), and 5052 metal M g containing some in aluminium alloy, mobility is deteriorated, cause some casting defects as limit split, the generation of the defect such as center segregation, center porosity.Wherein, center porosity be casting 5052 aluminium alloy common and also be difficult in subsequent processing operations eliminate defect, have very strong " heredity ", directly have influence on quality and the service life of final products.At present, the healing of research hole type defect both at home and abroad is mainly started with from thermal deformation, utilizes heat and deformation to make the counterdiffusion of atom phase to realize metallurgical binding, reaches and repair forging, the crackle of rolled piece inside, the object of hole in hot procedure.But how eliminating inside workpiece hole type defect in cold working process seldom has report.Therefore, the problem of center porosity is there is in this research for Jiangsu Chang Lv Chinalco 5052 aluminium alloy cast-rolled block, in conjunction with the cold-rolling process of 5052 aluminum alloy plate materials, under the prerequisite not increasing production cost, inquire into the center porosity adopting the method for cold rolling plume air flow to eliminate 5052 aluminium alloys.
Summary of the invention
the present invention is directed to the problem that 5052 aluminium alloy cast-rolled blocks exist center porosity, the invention provides a kind of casting 5052 aluminum alloy core loosen healing a kind of new method, the method can not only realize " the seamless healing " of 5052 these a kind of grade aluminium alloy materials, be also applicable to pure gold, silver, copper, iron, tin, lead, Aluminum-aluminum alloy cold rolling after carry out plume air flow process eliminate the problem of center porosity.
the technical solution adopted for the present invention to solve the technical problems is: material selection is the double-roller rolling 5052 aluminium alloy made-up belt that certain company produces, and made-up belt thickness is 2mm, and the composition of alloy made-up belt as shown in Figure 1.Figure 2 shows that double-roller rolling 5052 aluminium alloy made-up belt longitudinal section center porosity pattern, center visible is loose relatively more serious, and center porosity Breadth Maximum reaches 0.11mm.
casting 5052 aluminum alloy specimen thick for 4 pieces of 2mm is carried out the cold rolling Healing Experiments of single pass, cold rolling experiment is carried out on the two-roller mill of work roll diameter 180mm, and the reduction ratio of 4 pieces of samples is respectively 35%, 45%, 55%, 65%.Mill speed is 0.22m/s.Then, the reduction ratio after rolling is carried out annealing in process.The method preparing employing machine glazed finish and anodization masking of metallographic observation sample, center porosity is examined under a microscope, and metallographic structure is observed on Olympus BX51M type petrographic microscope.
present theory is thought:
1, different reduction ratio is on loose different from the impact of healing;
the abundant contact on hole surface is the precondition realizing loose healing.Only have abundant contact, the atom on loose contact surface just can be made close to each other, and reach within interatomic sphere of gravitational action.In addition, because the atom on loose hole surface has the most contiguous less atom or ligancy, like this, unsaturated linkage is exposed to surface and causes the unsaturated of metallic bond, once there be other metallic atoms to enter between atom within sphere of action, will be caught by this unsaturated bond and bonding occur.Therefore, in cold-rolled process, when reduction ratio is respectively 35% and 45%, because reduction ratio is lower, the amount of plastic deformation in rolled piece centre is less, and therefore loose hole is difficult to close.Work as reduction ratio
εduring >55%, the amount of plastic deformation in rolled piece centre is comparatively large, and the atom on loose hole surface is fully close to the distance that can have an effect, the metallic bond that to form, thus achieves cold rolling healing.
, different heating temperature is different on the impact of loose healing;
although healing has appearred in reduction ratio center porosity when 45% and 55%, being only the line segment healing of local, has been not overall healing.To realize overall healing, then need larger reduction ratio, but owing to being subject to ability restriction under milling train cold rolling, percentage pass reduction is be difficult to accomplish and also do not adopt in the cold rolling production of reality more than 65%.Therefore, rolled piece after utilizing multi-pass in actual production cold rolling needs intermediate annealing, 5052 aluminium alloys of reduction ratio 55% are carried out respectively the annealing in process of 200 DEG C × 2h and 450 DEG C × 2h, 5052 aluminum alloy core after thermomechanical annealing loosen pattern as shown in Figure 4,5.Contrasted from Fig. 4 and Fig. 3 c, 5052 aluminium alloys of reduction ratio 55% are after 200 DEG C × 2h anneals, and center porosity length obviously reduces, and original black lines shape pattern clearly has thickened unclear.When 5052 aluminium alloys of reduction ratio 55% are after 450 DEG C × 2h anneals, whole center porosity disappears substantially, and before annealing, linear center porosity becomes point-like, presents fragmentary distribution.
it can thus be appreciated that whole cold rolling plume air flow process is made up of two benches.First stage is in cold rolling agglutination, and because 5052 aluminium alloys are moderate strength aluminium alloys, work hardening capacity is strong, and matrix working hardening is obvious, causes contact surface repulsive force large, so can realize in the region that center porosity is slight depressing cold rolling healing greatly.And for the serious region of center porosity, rely on the cold rolling object that can not reach healing of large pressure, just mutual the embeddings formation mechanical bond at surface irregularity place.
but, when reduction ratio be 55% and the cold rolling sample of mechanical bond in the annealing process of 200 DEG C × 2h, long heating makes metallic atom be in hot activation state, atom action ability strengthens, metallic atom diffuses in the other side's matrix by combination interface mutually, form diffusion bond, loose hole heals more abundant.Along with annealing temperature be elevated to 450 DEG C time, the thermal diffusion aggravation of atom, loose hole interface is made to produce the dot matrix that more overlaps, particularly 450 DEG C of annealing causes the generation of deformation 5052 aluminium alloy recrystallization, also there is the formation of recrystal grain in interface and grow up, thus the originally inconsistent crystalline orientation in both sides, interface is rearranged, define " combination of same crystal face ", achieve " seamless healing ".
as can be seen here:
(1) adopt cold rolling plume air flow method not increasing production cost, existing production technology can be utilized again to eliminate the center porosity of casting 5052 aluminium plywood.
(2) in the cold rolling Healing Experiments of casting 5052 aluminium plywood base again, single pass can make its center porosity that local healing occurs more than 55% reduction ratio, this healing is because heavy reduction rate makes the distance of both sides, interface close contact reach in atomic lattice constant range, producing Van der Waals force between atom and combine, is physical bond.
(3) after process annealing is adopted to deformation 5052 aluminium alloy plate after the healing of local, warm-up movement due to atom becomes violent and makes the atom of the both sides, loose hole interface of not yet healing mutually enter in the other side's matrix, form diffusion bond, and further mitigate center porosity.After employing recrystallization annealing, the diffusion bond effect of atom is more remarkable, and almost eliminating whole center porosity, is the combination mutually interted between physics and chemistry; This annealing method be also applicable to pure gold, silver, copper, iron, tin, lead, Aluminum-aluminum alloy cold rolling after carry out plume air flow process eliminate the problem of center porosity.
(4) adopt cold-rolling practice to carry out die casting process to aluminium alloy, its reduction ratio is 20% ~ 70%.
(5) carry out plume air flow process to the aluminium after cold rolling, its heat treatment temperature is 150 DEG C ~ 500 DEG C, and its heat treatment time is 1.5 hours ~ 3.5 hours
the invention has the beneficial effects as follows:
1, the seamless healing of 5052 aluminum alloy materials can be realized, be also applicable to pure gold, silver, copper, iron, tin, lead, Aluminum-aluminum alloy cold rolling after carry out plume air flow process eliminate the problem of center porosity.
2, operation is short, energy-conservation, cost is low, can configure according to the market demand, produces the strip blank of various width and alloy, is particularly suitable for the production of small lot plurality of specifications product.
Accompanying drawing explanation
below in conjunction with drawings and Examples, the present invention is further described.
fig. 1 is the experiment composition (wt%) of 5052 aluminium alloys.
fig. 2 a, Fig. 2 b are casting 5052 aluminium alloy made-up belt center porosity patterns.
fig. 3 a, Fig. 3 b, Fig. 3 c, Fig. 3 d are the center porosity patterns of casting 5052 aluminium alloy under different reduction ratio.
fig. 4 be casting 5052 aluminium alloy cold rolled annealed after (
ε=55%+200 DEG C × 2h) center porosity pattern.
after Fig. 5 a, Fig. 5 b casting 5052 aluminium alloy are cold rolled annealed (
ε=55%+450 DEG C × 2h) center porosity pattern.
Detailed description of the invention
in Fig. 1, Fig. 2 a, 2b, Fig. 3 a, 3b, 3c, 3d, Fig. 4, Fig. 5 a, 5b, material selection is the double-roller rolling 5052 aluminium alloy made-up belt that certain company produces, and made-up belt thickness is 2mm, and the composition of alloy made-up belt as shown in Figure 1.Figure 2 shows that double-roller rolling 5052 aluminium alloy made-up belt longitudinal section center porosity pattern, center visible is loose relatively more serious, and center porosity Breadth Maximum reaches 0.11mm.
casting 5052 aluminum alloy specimen thick for 4 pieces of 2mm is carried out the cold rolling Healing Experiments of single pass, cold rolling experiment is carried out on the two-roller mill of work roll diameter 180mm, and the reduction ratio of 4 pieces of samples is respectively 35%, 45%, 55%, 65%.Mill speed is 0.22m/s.Then, the reduction ratio after rolling is carried out annealing in process.The method preparing employing machine glazed finish and anodization masking of metallographic observation sample, center porosity is examined under a microscope, and metallographic structure is observed on Olympus BX51M type petrographic microscope.
Claims (2)
1.
casting 5052 aluminum alloy core loosen healing a kind of new method, it is characterized in that: to aluminium alloy adopt cold-rolling practice carry out die casting process, its reduction ratio is 20% ~ 70%; Carry out thermal annealing healing processing to the aluminium after cold rolling, its annealing temperature is 150 DEG C ~ 500 DEG C, and its heat treatment time is 1 hour ~ 10 hours.
2.
casting 5052 aluminum alloy core according to claim 1 loosens a kind of new method of healing, it is characterized in that: this annealing method be also applicable to simultaneously pure gold, silver, copper, iron, tin, lead, Aluminum-aluminum alloy cold rolling after carry out plume air flow process eliminate center porosity problem.
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Citations (9)
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| JPH02254142A (en) * | 1989-03-27 | 1990-10-12 | Furukawa Alum Co Ltd | Aluminum alloy sheet excellent in deep drawability and its production |
| JPH04210459A (en) * | 1990-11-30 | 1992-07-31 | Toho Kinzoku Kk | Manufacture of molybdenum sheet |
| CN1449454A (en) * | 2000-08-29 | 2003-10-15 | 皮西尼何纳吕公司 | Method for manufacturing very thin aluminum-iron alloy strips |
| CN101798646A (en) * | 2010-04-22 | 2010-08-11 | 镇江鼎胜铝业股份有限公司 | Aluminum alloy material and manufacturing method for dual-zero aluminium foils |
| CN101880802A (en) * | 2010-07-30 | 2010-11-10 | 浙江巨科铝业有限公司 | Al-Mg series high magnesium aluminum alloy for automobile body plate and manufacturing method thereof |
| CN102492900A (en) * | 2011-12-09 | 2012-06-13 | 镇江鼎胜铝业股份有限公司 | Method for producing wide-amplitude double-zero aluminum foil blank by adopting cast-rolled compact |
| CN102756062A (en) * | 2012-07-02 | 2012-10-31 | 中国科学院金属研究所 | Forging method for efficiently healing hole flaws inside blank with large height-diameter ratio |
| CN103882271A (en) * | 2014-03-28 | 2014-06-25 | 合肥工业大学 | Al-Mg-Si-Cu alloy material with high strength and high elongation and preparation method thereof |
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2014
- 2014-12-10 CN CN201410747951.5A patent/CN104607463A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN87102994A (en) * | 1987-04-25 | 1988-11-09 | 中国原子能科学研究院 | Process for producing ribbons of hard aluminium alloy for deep stamping processing |
| JPH02254142A (en) * | 1989-03-27 | 1990-10-12 | Furukawa Alum Co Ltd | Aluminum alloy sheet excellent in deep drawability and its production |
| JPH04210459A (en) * | 1990-11-30 | 1992-07-31 | Toho Kinzoku Kk | Manufacture of molybdenum sheet |
| CN1449454A (en) * | 2000-08-29 | 2003-10-15 | 皮西尼何纳吕公司 | Method for manufacturing very thin aluminum-iron alloy strips |
| CN101798646A (en) * | 2010-04-22 | 2010-08-11 | 镇江鼎胜铝业股份有限公司 | Aluminum alloy material and manufacturing method for dual-zero aluminium foils |
| CN101880802A (en) * | 2010-07-30 | 2010-11-10 | 浙江巨科铝业有限公司 | Al-Mg series high magnesium aluminum alloy for automobile body plate and manufacturing method thereof |
| CN102492900A (en) * | 2011-12-09 | 2012-06-13 | 镇江鼎胜铝业股份有限公司 | Method for producing wide-amplitude double-zero aluminum foil blank by adopting cast-rolled compact |
| CN102756062A (en) * | 2012-07-02 | 2012-10-31 | 中国科学院金属研究所 | Forging method for efficiently healing hole flaws inside blank with large height-diameter ratio |
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Application publication date: 20150513 |
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