CN109897999A - A kind of high-strength and high ductility 2XXX aluminum alloy forge piece production technology - Google Patents
A kind of high-strength and high ductility 2XXX aluminum alloy forge piece production technology Download PDFInfo
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- CN109897999A CN109897999A CN201910342195.0A CN201910342195A CN109897999A CN 109897999 A CN109897999 A CN 109897999A CN 201910342195 A CN201910342195 A CN 201910342195A CN 109897999 A CN109897999 A CN 109897999A
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Abstract
The present invention relates to a kind of high-strength and high ductility 2XXX aluminum alloy forge piece production technologies, it is characterized in that, the ingredient of aluminium alloy cast ingot will be processed, successively by melting, two-step homogenization processing, extruded stock forming, extruded stock annealing, forging and molding and quick T6 heat treatment, it is processed into high-strength and high ductility 2XXX aluminum alloy forge piece.When doing solid solution aging in the application, a certain temperature spot more than decalescence point uses high temperature, short guarantor.At this time shortage of heat so that intergranular metal melt, but be enough to make the compound of intergranular to refine and incorporate matrix, to improve the intensity and plasticity of alloy.
Description
Technical field
The present invention relates to a kind of high-strength and high ductility 2XXX aluminum alloy forge piece production technologies, belong to aluminum alloy processing technology field.
Background technique
2XXX aluminium alloy belongs to heat-treatable strengthened alloy, has the excellent performances such as high-strength, high-ductility, corrosion-resistant.2XXX aluminium
Alloy is widely applied and aerospace, military equipment and related civilian industry field.Its performance depends primarily on grain direction, crystalline substance
Interior and intergranular precipitated phase type, size, form.Therefore aluminum alloy organization structure is adjusted by being heat-treated, sufficiently excavated
The potentiality of 2XXX aluminium alloy have extremely strong existing to meet requirement of the high-tech areas such as aerospace to aluminum alloy high-performance
Sincere justice and use value.
At present 2XXX alloy heat treatment when there are intergranular be precipitated offspring it is coarse, on precipitate free zone, Mg, Si
And phenomena such as cyrystal boundary segregation, occurs for a small amount of Cu element.And the domestic routine T6 heat treatment process time is long at present, energy consumption is high, stablizes
Property is poor.Very to these problems, by system research, the present invention proposes that one kind can form compact tissue, improves the new of alloy property
Heat treatment method.
Summary of the invention
The present invention is for 2XXX aluminum alloy forge piece intensity, plasticity, fatigue life low, poor corrosion resistance etc. in the prior art
Problem provides a kind of production technology of high-strength and high ductility 2XXX aluminum alloy forge piece.
The technical scheme to solve the above technical problems is that a kind of high-strength and high ductility 2XXX aluminum alloy forge piece produces work
Skill, which is characterized in that will process aluminium alloy cast ingot ingredient, successively by melting, two-step homogenization processing, extruded stock at
Shape, extruded stock annealing, forging and molding and quick T6 heat treatment, are processed into high-strength and high ductility 2XXX aluminum alloy forge piece；
Step 1, the melting is that prepared aluminium alloy stock is placed in melting in smelting furnace is liquid aluminium alloy, will
Liquid aluminium alloy founding is aluminium alloy cast ingot；
Step 2, two-step homogenization processing disappears for the aluminium alloy cast ingot of step 1 is carried out two-step homogenization processing
Except the component segregation in aluminium ingot；
Step 3, the extruded stock be configured to by by the two-step homogenization of step 2 processing after ingot casting be put into extrusion die
In uniformly squeeze, obtain size and the satisfactory extruded bars of tolerance；Wherein the temperature of extrusion cylinder is 450It 470 DEG C, squeezes
Speed is 1.02.0m/min；
Step 4, extruded stock annealing is that the extruded bars in step 3 are carried out secondary uniform annealing, further
Eliminate the secondary phase being precipitated in the primary phase of as cast condition and extrusion process；
Step 5, the forging and molding is the size that the extruded stock of step 4 is sawed into needs, is heated to 450 to 480
DEG C, forging stock is processed into using mold and equipment；
Step 6, quick T6 heat treatment is that the forging stock after the forging and molding by step 5 is heat-treated；Processing side
Formula is solid solution added-time effect, solid solubility temperature 510525 DEG C, the heating and thermal insulation time is 1530min, strict control enter the water time,
The water time is not more than 5 seconds from coming out of the stove to entering, and then carries out artificial aging processing, artificial aging temperature 130160 DEG C, the time
It is 1520h。。
Based on the above technical solution, the present invention may be used also to reach the stability of the convenience and equipment that use
To make following improvement to above-mentioned technical solution:
Further, the ingredient for walking the aluminium alloy cast ingot, is according to following mass percent ingredient:
Si:0.61.2, Fe :≤0.7, Cu:3.94.8, Mn:0.41.0, Mg:0.400.8, Ni≤0.1, Zn:
≤ 0.3, Ti≤0.15, single impurity≤0.05%, impurity total≤0.15%, surplus Al.
Further, the liquid aluminium alloy temperature in step 1 after melting is 700750 DEG C, the aluminium alloy cast ingot temperature after casting
Degree is 200250 DEG C, the cooling velocity of liquid aluminium alloy is 4050℃/min。、
Further, two-step homogenization annealing process is 395 DEG C of+490 DEG C of 10h for 24 hours in step 2.
Further, twin-stage annealing process is 485 DEG C of+510 DEG C of 15h for 24 hours in step 4.
Further, in step 5 when forging and molding, press machine pushes speed 1015mm/s, mold in entire forming process
Temperature is constant.
The present invention has the advantages that in the production technology of 1,2XXX aluminum alloy forge piece disclosed in this invention, cast alloy
Mainly by be distributed in dendritic crystalline Al, interdendritic eutectic structure and bone shape black phase and Al matrix high density, tiny precipitated phase
Composition.There are coarse second phases of grey and brilliant white, energy spectrum analysis to show that such phase is for intergranular as the result is shown for scanning electron microscope
Al2Cu phase, AlCuMgSi phase and Fe-riched phase, and ingredient Surface scan result also clearly shows that the second phase of different colours and shape intergranular
Ingredient information.As it can be seen that the alloy casting rod contains a large amount of coarse InterMetallic Compound phases, it need to be by Homogenization Treatments come portion
Divide dissolution or regulate and control such phase and its pattern, to weaken its influence to deformation after unloading processing and final performance.
2, Fe, Mn element primarily form Fe-riched phase, are present in interdendritic, are difficult to dissolve during Homogenization Treatments,
But fracture and nodularization can occur.Contain Cu element in these Fe-riched phases simultaneously, slackens the solid solution capacity of Cu element and influence indirectly
Alloy precipitated phase content and final precipitation strength effect, but this is unavoidable.A large amount of Cu elements form Al2Cu in interdendritic
Phase can gradually dissolve in Homogenization Process, but the above Homogenization Treatments are difficult to be completely dissolved Al2Cu phase as the result is shown, most
Still there is a small amount of Al2Cu phase to be present in interdendritic eventually.
Detailed description of the invention
Fig. 1 is the DSC curve of 2A50；
Fig. 2 is the DSC curve of 2A14；
Fig. 3 is the casting position schematic diagram that GJB2351-95 requires detection.
Specific embodiment
The principle and features of the present invention will be described below with reference to the accompanying drawings, and the given examples are served only to explain the present invention, and
It is non-to be used to limit the scope of the invention.
A kind of high-strength and high ductility 2XXX aluminum alloy forge piece production technology, which is characterized in that will process matching for aluminium alloy cast ingot
Material successively passes through melting, two-step homogenization processing, extruded stock forming, extruded stock annealing, forging and molding and quick T6 heat treatment,
It is processed into high-strength and high ductility 2XXX aluminum alloy forge piece；
Step 1, the melting is that prepared aluminium alloy stock is placed in melting in smelting furnace is liquid aluminium alloy, will
Liquid aluminium alloy founding is aluminium alloy cast ingot；
Step 2, two-step homogenization processing disappears for the aluminium alloy cast ingot of step 1 is carried out two-step homogenization processing
Except the component segregation in aluminium ingot；
Step 3, the extruded stock be configured to by by the two-step homogenization of step 2 processing after ingot casting be put into extrusion die
In uniformly squeeze, obtain size and the satisfactory extruded bars of tolerance；Wherein the temperature of extrusion cylinder is 450It 470 DEG C, squeezes
Speed is 1.02.0m/min；
Step 4, extruded stock annealing is that the extruded bars in step 3 are carried out secondary uniform annealing, further
Eliminate the secondary phase being precipitated in the primary phase of as cast condition and extrusion process；
Step 5, the forging and molding is the size that the extruded stock of step 4 is sawed into needs, is heated to 450 to 480
DEG C, forging stock is processed into using mold and equipment；
Step 6, quick T6 heat treatment is that the forging stock after the forging and molding by step 5 is heat-treated；Processing side
Formula is solid solution added-time effect, solid solubility temperature 510525 DEG C, the heating and thermal insulation time is 1530min, strict control enter the water time,
The water time is not more than 5 seconds from coming out of the stove to entering, and then carries out artificial aging processing, artificial aging temperature 130160 DEG C, the time
It is 1520h。
With 2A50 aluminum alloy forge piece (referring to Fig. 1), the initial temperature of the material endothermic peak is 530 DEG C, the end time 536
DEG C, the solid solubility temperature of prior heat treatment is generally 525 DEG C of+2h, and in the application, heat treatment temperature is generally 545 DEG C of+30min.Figure
Display only has an endothermic peak in 1, this endothermic peak initial temperature is 530 DEG C, and peak temperature is 536 DEG C, it can thus be appreciated that the conjunction
The initial fusion temperature of non-equilibrium low melting point eutectic tissue is 530 DEG C in gold, and prior heat treatment provides that solid solubility temperature is no more than 530
℃.And the present invention is verified by a large number of experiments, alloy is removing a small amount of AlCuMgSi more than intergranular compound after endotherm peak temperature
The instant solution of phase extra income, with the extension of soaking time, the slight overstriking of edge crystal boundary, but be not obvious in metallographic structure.
With 2A14 aluminum alloy forge piece (referring to fig. 2), the initial temperature of the material endothermic peak is 510 DEG C, and the end time is
515.1 DEG C, the solid solubility temperature of prior heat treatment is generally 505 DEG C of+2h, in the application heat treatment temperature be generally 525 DEG C+
20min.Display only has an endothermic peak in Fig. 2, this endothermic peak initial temperature is 510.7 DEG C, and peak temperature is 515.1 DEG C,
It can thus be appreciated that the initial fusion temperature of non-equilibrium low melting point eutectic tissue is 510 DEG C in the alloy, prior heat treatment regulation solid solution
Temperature is no more than 510 DEG C.And the present invention is verified by a large number of experiments, alloy is removed more than intergranular compound after endotherm peak temperature
The instant solution of a small amount of AlCuMgSi phase extra income, with the extension of soaking time, the slight overstriking of edge crystal boundary, but it is in metallographic structure and unknown
It is aobvious.
It is proved by test, the heating process of the application, can not only save solution time, reduce energy consumption, and
The size that hardening constituent can be refined makes the plasticity of alloy and intensity while greatly improving.
Performance requirement according to the following position in requirement position of GJB2351-95 is following (referring to Fig. 3):
Actual value (2A50):
Actual value (2A14)
The 2XXX aluminum alloy forge piece for the technique production for thering is above-mentioned actual detection numerical value to can be seen that using the application,
The elongation percentage required with the requirement position for being apparently higher than GJB2351-95.
Using the aluminum alloy forge piece of quick T6 heat treatment production, the intensity that same area stretches sample can be improved 20%, simultaneously
Plasticity improves 50%.
To the procedure of processing of the above embodiments, following specific descriptions are done:
The ingredient of the aluminium alloy cast ingot is according to following mass percent ingredient: Si:0.61.2、Fe:≤
0.7, Cu:3.94.8, Mn:0.41.0, Mg:0.400.8, Ni≤0.1, Zn :≤0.3, Ti≤0.15, single impurity≤
0.05%, impurity total≤0.15%, surplus Al.
Liquid aluminium alloy temperature in step 1 after melting is 700750 DEG C, the aluminium alloy cast ingot temperature after casting is 200250 DEG C, the cooling velocity of liquid aluminium alloy is 4050℃/min。
Two-step homogenization annealing process is 395 DEG C of+490 DEG C of 10h for 24 hours in step 2.
Twin-stage annealing process is 485 DEG C of+510 DEG C of 15h for 24 hours in step 4.
In step 5 when forging and molding, press machine pushes speed 1015mm/s, mold temperature is permanent in entire forming process
It is fixed.
The intensity and plasticity that alloy is improved in the application, we have invented be heat-treated at different heat with traditional T6
Reason method.
Traditional T6 is heat-treated temperature of the general solid solubility temperature less than the cutting edge of a knife or a sword that absorbs heat in material DSC curve, because decalescence point is aluminium
The point that alloy material intergranular compound melts.But it is proved according to a large amount of test, material is not vertical in heat absorption cutting edge of a knife or a sword temperature
Melt, but just starts to melt by the regular hour.A certain temperature when doing solid solution aging in the application, more than decalescence point
Degree point uses high temperature, short guarantor.At this time shortage of heat so that intergranular metal melt, but be enough to make the compound of intergranular to refine and incorporate
Matrix, to improve the intensity and plasticity of alloy.
The foregoing is merely presently preferred embodiments of the present invention, is not intended to limit the invention, it is all in spirit of the invention and
Within principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (6)
1. a kind of high-strength and high ductility 2XXX aluminum alloy forge piece production technology, which is characterized in that the ingredient of aluminium alloy cast ingot will be processed,
Successively by melting, two-step homogenization processing, extruded stock forming, extruded stock annealing, forging and molding and quick T6 heat treatment, processing
At high-strength and high ductility 2XXX aluminum alloy forge piece；
Step 1, the melting is that prepared aluminium alloy stock is placed in melting in smelting furnace is liquid aluminium alloy, by liquid
Aluminum alloy melt casting is aluminium alloy cast ingot；
Step 2, two-step homogenization processing eliminates aluminium for the aluminium alloy cast ingot of step 1 is carried out two-step homogenization processing
Component segregation in ingot；
Step 3, the extruded stock be configured to by by the two-step homogenization of step 2 processing after ingot casting be put into extrusion die
Even extruding obtains size and the satisfactory extruded bars of tolerance；Wherein the temperature of extrusion cylinder isSqueeze speed
Degree is
Step 4, extruded stock annealing is that the extruded bars in step 3 are carried out to secondary uniform annealing, is further eliminated
The secondary phase being precipitated in the primary phase of as cast condition and extrusion process；
Step 5, the forging and molding is the size that the extruded stock of step 4 is sawed into needs, is heated to 450 to 480 DEG C, benefit
Forging stock is processed into mold and equipment；
Step 6, quick T6 heat treatment is that the forging stock after the forging and molding by step 5 is heat-treated, to be dissolved the added-time
The processing mode of effect, solid solubility temperature areThe heating and thermal insulation time isIt controls into the water time, from
It comes out of the stove to the water time is entered no more than 5 seconds, then carries out artificial aging processing, artificial aging temperature isTime
For
2. high-strength and high ductility 2XXX aluminum alloy forge piece production technology according to claim 1, which is characterized in that the aluminium closes
The ingredient of golden ingot casting is according to following mass percent ingredient: Ni≤0.1, Zn:
≤ 0.3, Ti≤0.15, single impurity≤0.05%, impurity total≤0.15%, surplus Al.
3. high-strength and high ductility 2XXX aluminum alloy forge piece production technology according to claim 1, which is characterized in that melted in step 1
Liquid aluminium alloy temperature after refining isAluminium alloy cast ingot temperature after casting isLiquid
The cooling velocity of aluminium alloy is
4. high-strength and high ductility 2XXX aluminum alloy forge piece production technology according to claim 1, which is characterized in that double in step 2
Grade homogenizing annealing process is 395 DEG C of+490 DEG C of 10h for 24 hours.
5. high-strength and high ductility 2XXX aluminum alloy forge piece production technology according to claim 1, which is characterized in that double in step 4
Grade annealing process is 485 DEG C of+510 DEG C of 15h for 24 hours.
6. high-strength and high ductility 2XXX aluminum alloy forge piece production technology according to claim 1, which is characterized in that forged in step 5
When causing shape, press machine pushes speedMold temperature is constant in entire forming process.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111004950A (en) * | 2019-12-30 | 2020-04-14 | 辽宁忠旺集团有限公司 | 2000 aluminium alloy section bar and its manufacturing method |
| CN113293273A (en) * | 2021-04-13 | 2021-08-24 | 中铝材料应用研究院有限公司 | Processing method of 2xxx series aluminum alloy bar and wire for fastener |
| CN113857401A (en) * | 2021-09-05 | 2021-12-31 | 桂林理工大学 | Isothermal extrusion process for Al-Zn-Mg-Sc alloy hard disk box body |
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| CN104831135A (en) * | 2015-05-08 | 2015-08-12 | 福建省闽发铝业股份有限公司 | Method for producing thermal-resistant aluminum alloy |
| CN105441839A (en) * | 2016-01-12 | 2016-03-30 | 苏州有色金属研究院有限公司 | Processing technology for improving fatigue damage resistance of 2xxx series aluminium alloy plate |
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Patent Citations (4)
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| US20070102071A1 (en) * | 2005-11-09 | 2007-05-10 | Bac Of Virginia, Llc | High strength, high toughness, weldable, ballistic quality, castable aluminum alloy, heat treatment for same and articles produced from same |
| CN104831135A (en) * | 2015-05-08 | 2015-08-12 | 福建省闽发铝业股份有限公司 | Method for producing thermal-resistant aluminum alloy |
| CN105441839A (en) * | 2016-01-12 | 2016-03-30 | 苏州有色金属研究院有限公司 | Processing technology for improving fatigue damage resistance of 2xxx series aluminium alloy plate |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111004950A (en) * | 2019-12-30 | 2020-04-14 | 辽宁忠旺集团有限公司 | 2000 aluminium alloy section bar and its manufacturing method |
| CN111004950B (en) * | 2019-12-30 | 2021-07-20 | 辽宁忠旺集团有限公司 | 2000 aluminium alloy section bar and its manufacturing method |
| CN113293273A (en) * | 2021-04-13 | 2021-08-24 | 中铝材料应用研究院有限公司 | Processing method of 2xxx series aluminum alloy bar and wire for fastener |
| CN113857401A (en) * | 2021-09-05 | 2021-12-31 | 桂林理工大学 | Isothermal extrusion process for Al-Zn-Mg-Sc alloy hard disk box body |
| CN113857401B (en) * | 2021-09-05 | 2023-05-05 | 桂林理工大学 | Isothermal extrusion process for Al-Zn-Mg-Sc alloy hard disk cartridge body |
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