CN105543743B - A kind of process of the electric current solid-solution and aging heat treatment of 7050 aluminium alloy - Google Patents
A kind of process of the electric current solid-solution and aging heat treatment of 7050 aluminium alloy Download PDFInfo
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- CN105543743B CN105543743B CN201610041123.9A CN201610041123A CN105543743B CN 105543743 B CN105543743 B CN 105543743B CN 201610041123 A CN201610041123 A CN 201610041123A CN 105543743 B CN105543743 B CN 105543743B
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 71
- 230000032683 aging Effects 0.000 title claims abstract description 44
- 238000000034 method Methods 0.000 title claims abstract description 39
- 229910000838 Al alloy Inorganic materials 0.000 title claims abstract description 38
- 239000006104 solid solution Substances 0.000 title claims abstract description 29
- 238000011282 treatment Methods 0.000 claims abstract description 49
- 238000001816 cooling Methods 0.000 claims abstract description 28
- 239000000243 solution Substances 0.000 claims abstract description 20
- 238000000265 homogenisation Methods 0.000 claims abstract description 15
- 238000001192 hot extrusion Methods 0.000 claims abstract description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 11
- 238000002791 soaking Methods 0.000 claims abstract description 9
- 238000001125 extrusion Methods 0.000 claims description 30
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 26
- 229910052802 copper Inorganic materials 0.000 claims description 26
- 239000010949 copper Substances 0.000 claims description 26
- 238000010304 firing Methods 0.000 claims description 20
- 238000005266 casting Methods 0.000 claims description 10
- 238000009413 insulation Methods 0.000 claims 1
- 238000005265 energy consumption Methods 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 5
- 238000005728 strengthening Methods 0.000 abstract description 4
- 238000009776 industrial production Methods 0.000 abstract description 2
- 239000007769 metal material Substances 0.000 abstract description 2
- 229910045601 alloy Inorganic materials 0.000 description 12
- 239000000956 alloy Substances 0.000 description 12
- 230000005611 electricity Effects 0.000 description 6
- 230000007797 corrosion Effects 0.000 description 5
- 238000005260 corrosion Methods 0.000 description 5
- 230000005496 eutectics Effects 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 230000035882 stress Effects 0.000 description 4
- 230000005684 electric field Effects 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 239000002244 precipitate Substances 0.000 description 3
- 238000001556 precipitation Methods 0.000 description 3
- 229910001148 Al-Li alloy Inorganic materials 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- FCVHBUFELUXTLR-UHFFFAOYSA-N [Li].[AlH3] Chemical compound [Li].[AlH3] FCVHBUFELUXTLR-UHFFFAOYSA-N 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 239000001989 lithium alloy Substances 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 229910017526 Cu-Cr-Zr Inorganic materials 0.000 description 1
- 229910017810 Cu—Cr—Zr Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000007323 disproportionation reaction Methods 0.000 description 1
- 230000005686 electrostatic field Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005669 field effect Effects 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000007786 learning performance Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 230000036186 satiety Effects 0.000 description 1
- 235000019627 satiety Nutrition 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000007669 thermal treatment Methods 0.000 description 1
- 230000001550 time effect Effects 0.000 description 1
Classifications
-
- 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
- C22F1/057—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 of alloys with copper as the next major constituent
Abstract
A kind of electric current solid-solution and aging heat treatment process of 7050 aluminium alloy, belongs to technical field of metal material heat treatment, specifically includes：(1) Homogenization Treatments：While 7050 aluminium alloy cast ingots are passed through into direct current, Homogenization Treatments are carried out, room temperature is air-cooled to；(2) hot extrusion：(3) solution treatment：While square billet is passed through into alternating current, solution treatment is carried out, at room temperature water cooling；(4) Ageing Treatment：While square billet is passed through into alternating current, Ageing Treatment is carried out.Present invention process method, reasonably the heating-up temperature and soaking time of control electric current intensity, homogenization, solution treatment and Ageing Treatment, on the premise of heat treatment energy consumption is significantly reduced, obtain significant solid solution strengthening effect, the workpiece of excellent mechanical property is finally obtained, applied to industrial production.
Description
Technical field
The invention belongs to technical field of metal material heat treatment, and in particular to a kind of electric current solid solution aging of 7050 aluminium alloy
Process of thermal treatment method.
Background technology
Aluminium alloy is mainly strengthened by Precipitation, and the solution treatment before timeliness has weight to follow-up ag(e)ing process
The influence wanted, therefore the quantity that increases Age-prrcipitation Phase carries to reach often through the degree of super saturation for improving Alloy solid solution
The purpose of high strengthening effect.The solid solubility temperature of traditional Deformation structure is far below non-equilibrium low melting eutecticses point, causes thick compound
It mutually can not thoroughly dissolve, the combination property to alloy is had a negative impact.The solute degree of super saturation that alloy quenching is obtained
Both it is relevant with the composition of alloy, it is also relevant with solid solution degree.Therefore, on the premise of alloying element total content is not improved, how
The degree of supersaturation of solid solution is improved, thick non-cementing crystalline phase is reduced, to improving Precipitation degree and improving break resistance tool
There is positive effect.
Traditional solution treatment is that one kind is incubated a period of time under low-melting-point eutectic fusion temperature, then quick cooling
Method to obtain certain degree of supersaturation.With the raising and the extension of solution time of solid solubility temperature, the satiety of Alloy solid solution
It can be correspondingly improved with degree, but energy consumption is very big.Chen Kanghua etc. takes the Intensive intervention method progressively heated up, breaches low
The eutectic point of melting eutectic, it is to avoid burning, so as to improve the Precipitation degree of alloy and improve break resistance.
This Intensive intervention method is to improve an effective way of aluminium alloy combination property, especially significantly improves stress corrosion resistant
Performance, but do not substantially reduce the higher temperature solid solution time, i.e., do not reduce the energy consumption of solution treatment.
Ageing Treatment is that the workpiece after solution hardening is kept into appropriate time under room temperature or higher temperature, to improve its power
The method for learning performance.At present frequently with aging treatment process have：Single-stage aging (T6) has highest intensity, but crystal boundary is chain
The continuous precipitate of shape, with higher Sensitivity of Stress Corrosion and relatively low fracture toughness；Two-stage time effect (T76, T74 and
T73 the continuity of Grain Boundary Precipitates) is destroyed, is roughened the particle in crystal grain, reduces stress corrosion and Peeling Corrosion
Sensitiveness, also improves fracture toughness, but sacrifice partial intensities；Three-step aging (T77) can by special three-step aging, return
Return again timeliness (RRA processing) and deformation three kinds of methods of heat treatment to realize, be after peak value timeliness plus the high-temperature process of a short time
(recurrence), makes transgranular hardening constituent weight molten, peak value timeliness (timeliness again) is then carried out again, alloy is being kept the intensity of T6 states
The stress corrosion resistant ability close to T73 states is obtained simultaneously.Although above aging treatment method is improved to a certain extent
The tissue and performance of alloy, but still there is very big energy consumption problem.
Liu Wei etc. applies electric field in 2091 aluminium lithium alloy Homogenization Process, it is found that the volume fraction of second phase particles subtracts
Less, size diminishes, and the plasticity of alloy is obviously improved.Liu Beixing etc. has found to apply in the predeformation ag(e)ing process of 1420 aluminium lithium alloys
Intensity can be improved by strengthening electrostatic field, refine the δ ' phases of Dispersed precipitate.
Existing electric field processing device haves the shortcomings that temperature distributing disproportionation, sample size be small, equipment is complicated huge, can only
Doing pat is used for scientific research, without construction value.During the application of electric field, the generation of electric current is not (general
Can detect only≤50 μm), and electric current directly or indirectly promotes the mobility of particle in joule heating effect mode, because
This understands that electric current is greater than field effect to the effect of Particles Moving.But, estimated current processing is used for Cu-Cr-Zr and steel
It is few about the application in terms of aluminium alloy electric current timeliness in iron material.
The content of the invention
In view of the shortcomings of the prior art, the present invention provides a kind of technique of the electric current solid-solution and aging heat treatment of 7050 aluminium alloy
Method, is a kind of continuous solid solution of aluminium alloy and aging treatment process method for being applied to quickly heat, save energy consumption.
The process of the electric current solid-solution and aging heat treatment of 7050 aluminium alloys of the present invention, specifically includes following steps：
Step 1, Homogenization Treatments：
7050 aluminium alloy cast ingots are put into electric current heat-treatment furnace, electric current is passed through to ingot casting, 460~480 DEG C, guarantor are heated to
20~28h of temperature, stopping is passed through electric current, is air-cooled to room temperature, obtains ingot blank, wherein, current strength is 1~500A, and current type is
Direct current.
Step 2, hot extrusion：
Ingot blank is put into heating furnace, 480~520 DEG C are preheated to, 2~4h, come out of the stove carry out extrusion molding, acquisition side is incubated
Base, wherein, extrusion speed is 1.5~4.0mm/s, and extrusion ratio is 8~10, and the square billet after extruding is air-cooled to room temperature；
Step 3, solution treatment：
Square billet is put into electric current heat-treatment furnace, electric current is passed through to square billet, 450~475 DEG C are heated to, 0.3~2h is incubated,
Stopping is passed through electric current, water cooling at room temperature of coming out of the stove, wherein, current strength is 1~500A, and current type is alternating current；
Step 4, Ageing Treatment：
Square billet is put into electric current heat-treatment furnace, electric current is passed through to square billet, 120~140 DEG C are heated to, 1~48h is incubated,
Stopping is passed through electric current, air cooling of then coming out of the stove, wherein, current strength is 1~500A, and current type is alternating current.
Wherein,
Described electric current heat-treatment furnace is air circulation heat-treatment furnace；
Firing rate in the step 1, step 2, step 3 and step 4 is 1~5 DEG C/min, by the maximum of the workpiece
Thickness is determined；
In the step 1, step 3 and step 4, the method for being passed through electric current is：At the two ends of 7050 aluminium alloys or square billet, lead to
Cross copper fixture and be passed through electric current；
In described step 1, temperature is 465 DEG C, and soaking time is 24h；
In described step 3, current strength is 500A, and temperature is 470 DEG C, and soaking time is 20min；
In described step 4, current strength is 500A, and temperature is 120 DEG C, and soaking time is 6h.
The final performance of alloy can be produced because solution treatment stage and Stages of Aging separately or concurrently apply electric current
Significantly affect, so optimal soaking time selects the peak strength corresponding time under each state.
The process of the electric current solid-solution and aging heat treatment of 7050 aluminium alloys of the present invention, has the beneficial effect that：
Reasonably the heating-up temperature and soaking time of control electric current intensity, homogenization, solution treatment and Ageing Treatment, are showing
On the premise of writing reduction heat treatment energy consumption, significant solid solution strengthening effect is obtained, the workpiece of excellent mechanical property is finally obtained, should
For industrial production.
Embodiment
In following examples, the chemical composition of 7050 alloys is shown in Table 1.
The alloy composition of table 1 7050 (wt.%)
Embodiment 1
The process of the electric current solid-solution and aging heat treatment of 7050 aluminium alloys, specifically includes following steps：
Step 1, Homogenization Treatments：
Size is put into air circulation heat-treatment furnace for 160 × 160mm of Φ 7050 aluminium alloy as cast condition poles, to ingot casting
Two ends, 500A direct currents are passed through by copper fixture, 460 DEG C are heated to, 20h is incubated, stopping is passed through electric current, and stove is air-cooled to room
Temperature, obtains ingot blank；
Step 2, hot extrusion：
Ingot blank is put into heating furnace, 500 DEG C are preheated to, 2h is incubated, carry out extrusion molding of coming out of the stove, obtain size be 10 ×
200 × 12000mm square billet, wherein, extrusion speed is 3.0mm/s, and extrusion ratio is 10, and the square billet after extruding carries out air cooling, cuts
Cut；
Step 3, solution treatment：
Size is put into air circulation heat-treatment furnace for 10 × 20 × 580mm square billet, to the two ends of square billet, passes through copper
Fixture is passed through electric current, is heated to 470 DEG C, firing rate is 5 DEG C/min, is incubated 0.33h, stopping is passed through electric current, come out of the stove in room temperature
Lower water cooling, wherein, electric current is 500A alternating currents；
Step 4, Ageing Treatment：
Square billet is put into air circulation heat-treatment furnace, to the two ends of square billet, electric current is passed through by copper fixture, is heated to
120 DEG C, firing rate is 5 DEG C/min, is incubated 1h, and stopping is passed through electric current, air cooling of then coming out of the stove, wherein, electric current exchanges for 500A
Electricity.
Embodiment 2
The process of the electric current solid-solution and aging heat treatment of 7050 aluminium alloys, specifically includes following steps：
Step 1, Homogenization Treatments：
Size is put into air circulation heat-treatment furnace for 160 × 160mm of Φ 7050 aluminium alloy as cast condition poles, to ingot casting
Two ends, 500A direct currents are passed through by copper fixture, 456 DEG C are heated to, 22h is incubated, stopping is passed through electric current, and stove is air-cooled to room
Temperature, obtains ingot blank；
Step 2, hot extrusion：
Ingot blank is put into heating furnace, 500 DEG C are preheated to, 2h is incubated, carry out extrusion molding of coming out of the stove, obtain size be 10 ×
200 × 12000mm square billet, wherein, extrusion speed is 3.0mm/s, and extrusion ratio is 10, and the square billet after extruding carries out air cooling, cuts
Cut；
Step 3, solution treatment：
Size is put into air circulation heat-treatment furnace for 10 × 20 × 580mm square billet, to the two ends of square billet, passes through copper
Fixture is passed through electric current, is heated to 475 DEG C, firing rate is 5 DEG C/min, is incubated 0.33h, stopping is passed through electric current, come out of the stove in room temperature
Lower water cooling, wherein, electric current is 500A alternating currents；
Step 4, Ageing Treatment：
Square billet is put into air circulation heat-treatment furnace, to the two ends of square billet, electric current is passed through by copper fixture, is heated to
130 DEG C, firing rate is 5 DEG C/min, is incubated 6h, and stopping is passed through electric current, air cooling of then coming out of the stove, wherein, electric current exchanges for 500A
Electricity.
Embodiment 3
The process of the electric current solid-solution and aging heat treatment of 7050 aluminium alloys, specifically includes following steps：
Step 1, Homogenization Treatments：
Size is put into air circulation heat-treatment furnace for 160 × 160mm of Φ 7050 aluminium alloy as cast condition poles, to ingot casting
Two ends, 500A direct currents are passed through by copper fixture, 470 DEG C are heated to, 24h is incubated, stopping is passed through electric current, and stove is air-cooled to room
Temperature, obtains ingot blank；
Step 2, hot extrusion：
Ingot blank is put into heating furnace, 500 DEG C are preheated to, 2h is incubated, carry out extrusion molding of coming out of the stove, obtain size be 10 ×
200 × 12000mm square billet, wherein, extrusion speed is 3.0mm/s, and extrusion ratio is 10, and the square billet after extruding carries out air cooling, cuts
Cut；
Step 3, solution treatment：
Size is put into air circulation heat-treatment furnace for 10 × 20 × 580mm square billet, to the two ends of square billet, passes through copper
Fixture is passed through electric current, is heated to 450 DEG C, firing rate is 5 DEG C/min, is incubated 2h, stopping is passed through electric current, water at room temperature of coming out of the stove
It is cold, wherein, electric current is 500A alternating currents；
Step 4, Ageing Treatment：
Square billet is put into air circulation heat-treatment furnace, to the two ends of square billet, electric current is passed through by copper fixture, is heated to
140 DEG C, firing rate is 5 DEG C/min, is incubated 24h, and stopping is passed through electric current, air cooling of then coming out of the stove, wherein, electric current exchanges for 500A
Electricity.
Embodiment 4
The process of the electric current solid-solution and aging heat treatment of 7050 aluminium alloys, specifically includes following steps：
Step 1, Homogenization Treatments：
Size is put into air circulation heat-treatment furnace for 160 × 160mm of Φ 7050 aluminium alloy as cast condition poles, to ingot casting
Two ends, 500A direct currents are passed through by copper fixture, 475 DEG C are heated to, 26h is incubated, stopping is passed through electric current, and stove is air-cooled to room
Temperature, obtains ingot blank；
Step 2, hot extrusion：
Ingot blank is put into heating furnace, 500 DEG C are preheated to, 2h is incubated, carry out extrusion molding of coming out of the stove, obtain size be 10 ×
200 × 12000mm square billet, wherein, extrusion speed is 3.0mm/s, and extrusion ratio is 10, and the square billet after extruding carries out air cooling, cuts
Cut；
Step 3, solution treatment：
Size is put into air circulation heat-treatment furnace for 10 × 20 × 580mm square billet, to the two ends of square billet, passes through copper
Fixture is passed through electric current, is heated to 460 DEG C, firing rate is 5 DEG C/min, is incubated 1h, stopping is passed through electric current, water at room temperature of coming out of the stove
It is cold, wherein, electric current is 500A alternating currents；
Step 4, Ageing Treatment：
Square billet is put into air circulation heat-treatment furnace, to the two ends of square billet, electric current is passed through by copper fixture, is heated to
130 DEG C, firing rate is 5 DEG C/min, is incubated 2h, and stopping is passed through electric current, air cooling of then coming out of the stove, wherein, electric current is 1A alternating currents.
Embodiment 5
The process of the electric current solid-solution and aging heat treatment of 7050 aluminium alloys, specifically includes following steps：
Step 1, Homogenization Treatments：
Size is put into air circulation heat-treatment furnace for 160 × 160mm of Φ 7050 aluminium alloy as cast condition poles, to ingot casting
Two ends, 500A direct currents are passed through by copper fixture, 480 DEG C are heated to, 28h is incubated, stopping is passed through electric current, and stove is air-cooled to room
Temperature, obtains ingot blank；
Step 2, hot extrusion：
Ingot blank is put into heating furnace, 500 DEG C are preheated to, 2h is incubated, carry out extrusion molding of coming out of the stove, obtain size be 10 ×
200 × 12000mm square billet, wherein, extrusion speed is 3.0mm/s, and extrusion ratio is 10, and the square billet after extruding carries out air cooling, cuts
Cut；
Step 3, solution treatment：
Size is put into air circulation heat-treatment furnace for 10 × 20 × 580mm square billet, to the two ends of square billet, passes through copper
Fixture is passed through electric current, is heated to 465 DEG C, firing rate is 5 DEG C/min, is incubated 1.5h, stopping is passed through electric current, come out of the stove at room temperature
Water cooling, wherein, electric current is 1A alternating currents；
Step 4, Ageing Treatment：
Square billet is put into air circulation heat-treatment furnace, to the two ends of square billet, electric current is passed through by copper fixture, is heated to
140 DEG C, firing rate is 5 DEG C/min, is incubated 12h, and stopping is passed through electric current, air cooling of then coming out of the stove, wherein, electric current exchanges for 500A
Electricity.
Embodiment 6
The process of the electric current solid-solution and aging heat treatment of 7050 aluminium alloys, specifically includes following steps：
Step 1, Homogenization Treatments：
Size is put into air circulation heat-treatment furnace for 160 × 160mm of Φ 7050 aluminium alloy as cast condition poles, to ingot casting
Two ends, 500A direct currents are passed through by copper fixture, 465 DEG C are heated to, 24h is incubated, stopping is passed through electric current, and stove is air-cooled to room
Temperature, obtains ingot blank；
Step 2, hot extrusion：
Ingot blank is put into heating furnace, 500 DEG C are preheated to, 2h is incubated, carry out extrusion molding of coming out of the stove, obtain size be 10 ×
200 × 12000mm square billet, wherein, extrusion speed is 3.0mm/s, and extrusion ratio is 10, and the square billet after extruding carries out air cooling, cuts
Cut；
Step 3, solution treatment：
Size is put into air circulation heat-treatment furnace for 10 × 20 × 580mm square billet, to the two ends of square billet, passes through copper
Fixture is passed through electric current, is heated to 470 DEG C, firing rate is 5 DEG C/min, is incubated 0.33h, stopping is passed through electric current, come out of the stove in room temperature
Lower water cooling, wherein, electric current is 1A alternating currents；
Step 4, Ageing Treatment：
Square billet is put into air circulation heat-treatment furnace, to the two ends of square billet, electric current is passed through by copper fixture, is heated to
120 DEG C, firing rate is 5 DEG C/min, is incubated 48h, and stopping is passed through electric current, air cooling of then coming out of the stove, wherein, electric current exchanges for 1A
Electricity.
Embodiment 7
The process of the electric current solid-solution and aging heat treatment of 7050 aluminium alloys, specifically includes following steps：
Step 1, Homogenization Treatments：
Size is put into air circulation heat-treatment furnace for 160 × 160mm of Φ 7050 aluminium alloy as cast condition poles, to ingot casting
Two ends, 500A direct currents are passed through by copper fixture, 465 DEG C are heated to, 24h is incubated, stopping is passed through electric current, and stove is air-cooled to room
Temperature, obtains ingot blank；
Step 2, hot extrusion：
Ingot blank is put into heating furnace, 500 DEG C are preheated to, 2h is incubated, carry out extrusion molding of coming out of the stove, obtain size be 10 ×
200 × 12000mm square billet, wherein, extrusion speed is 3.0mm/s, and extrusion ratio is 10, and the square billet after extruding carries out air cooling, cuts
Cut；
Step 3, solution treatment：
Size is put into air circulation heat-treatment furnace for 10 × 20 × 580mm square billet, to the two ends of square billet, passes through copper
Fixture is passed through electric current, is heated to 470 DEG C, firing rate is 5 DEG C/min, is incubated 0.33h, stopping is passed through electric current, come out of the stove in room temperature
Lower water cooling, wherein, electric current is 1A alternating currents；
Step 4, Ageing Treatment：
Square billet is put into air circulation heat-treatment furnace, to the two ends of square billet, electric current is passed through by copper fixture, is heated to
120 DEG C, firing rate is 5 DEG C/min, is incubated 24h, and stopping is passed through electric current, air cooling of then coming out of the stove, wherein, electric current exchanges for 500A
Electricity.
Embodiment 8
The process of the electric current solid-solution and aging heat treatment of 7050 aluminium alloys, specifically includes following steps：
Step 1, Homogenization Treatments：
Size is put into air circulation heat-treatment furnace for 160 × 160mm of Φ 7050 aluminium alloy as cast condition poles, to ingot casting
Two ends, 500A direct currents are passed through by copper fixture, 465 DEG C are heated to, 24h is incubated, stopping is passed through electric current, and stove is air-cooled to room
Temperature, obtains ingot blank；
Step 2, hot extrusion：
Ingot blank is put into heating furnace, 500 DEG C are preheated to, 2h is incubated, carry out extrusion molding of coming out of the stove, obtain size be 10 ×
200 × 12000mm square billet, wherein, extrusion speed is 3.0mm/s, and extrusion ratio is 10, and the square billet after extruding carries out air cooling, cuts
Cut；
Step 3, solution treatment：
Size is put into air circulation heat-treatment furnace for 10 × 20 × 580mm square billet, to the two ends of square billet, passes through copper
Fixture is passed through electric current, is heated to 470 DEG C, firing rate is 5 DEG C/min, is incubated 0.5h, stopping is passed through electric current, come out of the stove at room temperature
Water cooling, wherein, electric current is 500A alternating currents；
Step 4, Ageing Treatment：
Square billet is put into air circulation heat-treatment furnace, to the two ends of square billet, electric current is passed through by copper fixture, is heated to
120 DEG C, firing rate is 5 DEG C/min, is incubated 1h, and stopping is passed through electric current, air cooling of then coming out of the stove, wherein, electric current is 1A alternating currents.
Mechanics Performance Testing is carried out to the embodiment workpiece after Ageing Treatment, as a result as shown in table 2.
The embodiment 1-8 of table 2 mechanical property result
Claims (6)
1. a kind of process of the electric current solid-solution and aging heat treatment of 7050 aluminium alloy, it is characterised in that comprise the following steps：
Step 1, Homogenization Treatments：
7050 aluminium alloy cast ingots are put into electric current heat-treatment furnace, electric current is passed through to ingot casting, 460~480 DEG C, insulation 20 are heated to
~28h, stopping is passed through electric current, is air-cooled to room temperature, obtains ingot blank, wherein, firing rate is 1~5 DEG C/min, and current strength is 1
~500A, current type is direct current；
Step 2, hot extrusion：
Ingot blank is put into heating furnace, 480~520 DEG C are preheated to, 2~4h is incubated, carry out extrusion molding of coming out of the stove obtains square billet,
Wherein, extrusion speed is 1.5~4.0mm/s, and extrusion ratio is 8~10, and the square billet after extruding is air-cooled to room temperature, wherein, heating speed
Spend for 1~5 DEG C/min；
Step 3, solution treatment：
Square billet is put into electric current heat-treatment furnace, electric current is passed through to square billet, 450~475 DEG C are heated to, 0.3~2h is incubated, stopped
Electric current is passed through, water cooling at room temperature of coming out of the stove, wherein, firing rate is 1~5 DEG C/min, and current strength is 1~500A, current capacity
Type is alternating current；
Step 4, Ageing Treatment：
Square billet is put into electric current heat-treatment furnace, electric current is passed through to square billet, 120~140 DEG C are heated to, 1~48h is incubated, stopped
Electric current is passed through, air cooling of then coming out of the stove, wherein, firing rate is 1~5 DEG C/min, and current strength is 1~500A, and current type is
Alternating current.
2. the process of the electric current solid-solution and aging heat treatment of 7050 aluminium alloy according to claim 1, it is characterised in that
Described electric current heat-treatment furnace is air circulation heat-treatment furnace.
3. the process of the electric current solid-solution and aging heat treatment of 7050 aluminium alloy according to claim 1, it is characterised in that
In the step 1, step 3 and step 4, the method for being passed through electric current is：At the two ends of 7050 aluminium alloys or square billet, pass through copper fixture
It is passed through electric current.
4. the process of the electric current solid-solution and aging heat treatment of 7050 aluminium alloy according to claim 1, it is characterised in that
In described step 1, temperature is 465 DEG C, and soaking time is 24h.
5. the process of the electric current solid-solution and aging heat treatment of 7050 aluminium alloy according to claim 1, it is characterised in that
In described step 3, current strength is 500A, and temperature is 470 DEG C, and soaking time is 20min.
6. the process of the electric current solid-solution and aging heat treatment of 7050 aluminium alloy according to claim 1, it is characterised in that
In described step 4, current strength is 500A, and temperature is 120 DEG C, and soaking time is 6h.
Priority Applications (1)
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