CN106435418A - Heat treatment technology for improving intercrystalline corrosion resisting performance and stress corrosion resisting performance of 7-series aluminum alloy - Google Patents
Heat treatment technology for improving intercrystalline corrosion resisting performance and stress corrosion resisting performance of 7-series aluminum alloy Download PDFInfo
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- CN106435418A CN106435418A CN201611046664.7A CN201611046664A CN106435418A CN 106435418 A CN106435418 A CN 106435418A CN 201611046664 A CN201611046664 A CN 201611046664A CN 106435418 A CN106435418 A CN 106435418A
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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
- C22F1/053—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 zinc as the next major constituent
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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
- C22F1/002—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working by rapid cooling or quenching; cooling agents used therefor
Abstract
The invention relates to a heat treatment technology for improving the intercrystalline corrosion resisting performance and stress corrosion resisting performance of a 7-series aluminum alloy. The heat treatment technology includes two-stage solid solution treatment, quenching treatment and two-stage aging heat treatment. According to the two-stage solid solution treatment of the 7-series high-strength aluminum alloy, first-stage solid solution treatment is firstly conducted for 0.5 h to 2 h under the temperature ranging from 440 DEG C to 460 DEG C; and then second-stage solid solution strengthening treatment is conducted for 0.5 h to 2 h under the temperature ranging from 475 DEG C to 500 DEG C, after the two-stage solid solution treatment is over, quenching is conducted immediately, cooling is conducted to the room temperature, and room-temperature water serves as the quenching medium. Then first-stage low-temperature pre-aging is conducted, the first-stage aging temperature ranges from 110 DEG C to 140 DEG C, and the aging time ranges from 2 h to 12 h; and second-stage high-temperature aging is conducted at the temperature of 150 DEG C to 170 DEG C, the aging time ranges from 16 h to 36 h, and then cooling is conducted to the room temperature. According to the heat treatment technology, the intercrystalline corrosion resisting performance and stress corrosion resisting performance of the aluminum alloy are improved, and meanwhile the high hardness and tensile strength of the aluminum alloy are ensured. The method is simple and easy to implement, and the comprehensive performance of the material obtained through the method is better than that of a material obtained through a traditional method.
Description
Technical field
The present invention relates to a kind of raising 7 is the heat of ultra-high-strength aluminum alloy anti intercrystalline corrosion performance and anti-stress corrosion performance
Processing method, the present invention relates to metal heat treatmet field.
Background technology
7 line aluminium alloys have higher specific strength and hardness, and excellent processing characteristics, are widely used in production system
Make in field.With the continuous development of modern industry, its performance is had the further requirement that：Keeping alloy high strength, hardness
In the case of, also require which has more excellent resistance to intergranular corrosion and anti-stress corrosion performance.
7 line aluminium alloys are a kind of typically heat-treatable strengthened aluminium alloys, can be obtained by heat treatment very high strong
The mechanical properties such as degree, hardness.But but occur the situation of stress corrosion cracking and intercrystalline corrosion after storage, be unfavorable for that 7 are
Development further and the application of aluminium alloy.
The Technology for Heating Processing of 7 line aluminium alloys is mainly solid solution and timeliness.Solution treatment returns thick the second phase in alloy
Molten in matrix, while can produce to degree of supersaturation of the form of crystal grain and size, recrystallization degree and solid solution etc. very big
Impact, causes material structure to change, and then affects anti intercrystalline corrosion and anti-stress corrosion performance.Traditional solution treatment is big
It is all single-stage solid solution, this process can not make second to be mutually fully dissolved in matrix, causes the Precipitation stage not ideal enough, so as to
So that the corrosion among crystalline grains raising of alloy is not notable.As limit solid solubility temperature is higher than the polyphase eutectic of alloy during two grades of solid solutions
Temperature, now in alloy thick second phase can farthest back dissolving in matrix, so as to improve anti intercrystalline corrosion performance.When
When effect is processed, supersaturated solid solution is separated out from matrix and forms the second phase of disperse, produces invigoration effect to alloy further.During peak
Effect is processed can make 7 line aluminium alloys obtain higher intensity, but its anti intercrystalline corrosion performance decline is apparent；Although overaging
Can improve its anti-stress corrosion performance and fracture toughness, but now the intensity of alloy but lose very serious.
For the solid solution aging system of aluminum alloy materials, a lot of scholars have carried out widely studied.But due to aluminium alloy
Mechanical property be often inversely proportional to its anti intercrystalline corrosion performance and anti-stress corrosion performance, therefore not yet develop at present preferably
Heat treating regime conflicting between three to balance, and be really applied to actual production.Therefore, develop a kind of superior
Double_stage guide two-stage time effect heat treating regime, both can guarantee that the mechanical properties such as aluminium alloy high-strength and hardness, make again its tool
There are good anti intercrystalline corrosion performance and anti-stress corrosion performance, it appears particularly important.
Content of the invention
The invention aims to overcoming Mechanical Properties of Aluminum Alloys, the anti intercrystalline corrosion performance that is stated in background technology
Contradiction and anti-stress corrosion performance between and a kind of system of heat treatment process for improving 7 line aluminium alloy combination properties is provided.
Involved in the present invention on the basis of 7 line aluminium alloy intensity and hardness higher level is kept, improve its anti-intergranular
Corrosive nature and the method for anti-stress corrosion performance, step is as follows：
(1) double_stage guide heat treatment is carried out to 7 line aluminium alloys：Sample is heated up with stove, first temperature is increased to 440 DEG C
～460 DEG C carry out one-level solution heat treatment, 0.5～2h of process time, and then temperature being increased to 475 DEG C～500 DEG C carries out
Two grades of solution treatment, 0.5～2h of process time；
(2) Quenching Treatment is carried out after double_stage guide heat treatment terminates immediately, and hardening media is room temperature water, and is cooled to room temperature
State；
(3) two-stage time effect heat treatment is carried out：Sample is warmed up to 110 DEG C～140 DEG C with stove carries out one-level Ageing Treatment, when
Effect process time is 2～12h, continues thereafter with and is warmed up to 150 DEG C～170 DEG C and carries out second level Ageing Treatment, during the timeliness of the second level
Between 16～36h；
(4) further, the hardening phase in above-mentioned heat treatment process, in step (2), quenching shift time is less than
16s.
The present invention adopts double_stage guide Technology for Heating Processing, and the second level high temperature solid solution stage can make more thick in alloy
Second phase particles are dissolved in matrix, improve degree of supersaturation, it is ensured that alloy has excellent intensity and hardness after quenching, and when being
The effect stage is ready.In Stages of Aging, the first stage is low temperature Pre-aging treatment, to make alloy separate out the second of small and dispersed
Phase, and promote GP area forming core；Second level Ageing Treatment is 150 DEG C～170 DEG C, process time 16h～36h, and the stage enters one
Step promotes Second Phase Precipitation.By the time of rationally control timeliness, in the case that intensity and hardness slightly decline, have alloy
There are excellent anti intercrystalline corrosion and anti-stress corrosion performance.Through the heat treatment in these stages, the present invention not only ensure that height
The intensity and hardness of strength aluminum alloy, also enables aluminum alloy to, with excellent anti intercrystalline corrosion performance and anti-stress corrosion performance, break through
The technical barrier that in prior heat treatment process, intensity, hardness and corrosion among crystalline grains, stress corrosion performance can not get both.
The technological process of the present invention is simple, and heat treatment operation difficulty is little, with good replicability, greatly improves
The use field of the alloy and scope.
Description of the drawings
Below in conjunction with the accompanying drawings technical solution of the present invention is further described：
Fig. 1 is the intercrystalline corrosion crystalline phase figure of the comparative example 1 of the present invention；
Fig. 2 is the intercrystalline corrosion crystalline phase figure of the comparative example 2 of the present invention；
Fig. 3 is the scanning electron microscope (SEM) photograph of the comparative example 1 of the present invention；
Fig. 4 is the scanning electron microscope (SEM) photograph of the comparative example 2 of the present invention.
Specific embodiment
Below by the figures above and with reference to instantiation, the present invention will be further described.
Present invention raising 7 is the heat treatment method of ultra-high-strength aluminum alloy anti intercrystalline corrosion performance and anti-stress corrosion performance,
Sample is carried out double_stage guide process, rapid quenching successively process and two-stage time effect heat treatment.Specifically include following steps：
(1) being that ultrahigh-strength aluminum alloy carries out double_stage guide process first to 7, i.e., first one-level is carried out at 440 DEG C～460 DEG C
Solution heat treatment, 0.5～2h of process time, then carry out second level solution treatment at 475 DEG C～500 DEG C, process time 0.5～
2h.Control the degree of growing up of crystal grain, it is to avoid the appearance of burning crystal grain, the degree of supersaturation of solute atoms is improved, is two-stage time effect
During process, the precipitation of disperse phase is ready；
(2) Quenching Treatment being carried out after double_stage guide process and being cooled to room temperature, quenching shift time is less than 16s, quenching
Medium is room temperature water；
(3) after quenching, one-level low temperature aging is first carried out, it is 2～12h that aging temp is 110 DEG C～140 DEG C, aging time；
Then being warmed up to 150 DEG C～170 DEG C carries out second level Ageing Treatment, 16～36h of aging time.
In the present invention, each embodiment and control sample are using identical component and 7 line aluminium alloy samples of specification, 7 for being adopted
Line aluminium alloy composition is as shown in table 1.
7 line aluminium alloy compositions/wt% employed in each embodiment of table 1 and control sample
Embodiment 1：
A kind of Technology for Heating Processing for improving 7 line aluminium alloy anti intercrystalline corrosion performances and anti-stress corrosion performance, including twin-stage
Solid solution, quenching, two-stage time effect heat treatment.One-level solution treatment is carried out first, by sample by certain heating rate with stove heat
To 440 DEG C, 0.5h is incubated.Continue after the completion of insulation to be warming up to 500 DEG C with stove, insulation 0.5h proceeds two grades of solution treatment.
Immediately transfer after solid solution terminates is quenched and is cooled to room temperature.Then two-stage time effect process is carried out.The two-stage time effect is processed
Specially：First at 110 DEG C, insulation 2h carries out one-level Ageing Treatment, is continuously heating to 170 DEG C after the completion of insulation, is incubated 36h
Carry out secondary time effect process.
Described heat treatment temperature rise period 10 °/s of heating rate, quenching shift time is less than 16s, and hardening media is room temperature
Water.
Embodiment 2：
A kind of Technology for Heating Processing for improving 7 line aluminium alloy anti intercrystalline corrosion performances and anti-stress corrosion performance, including twin-stage
Solid solution, quenching, two-stage time effect heat treatment.One-level solution treatment is carried out first, by sample by certain heating rate with stove heat
To 450 DEG C, 0.5h being incubated, continuing after the completion of insulation 485 DEG C to be warming up to stove, insulation 1.5h carries out two grades of solution treatment.Solid solution
Transfer of pulling up a horse after end is quenched and is cooled to room temperature.
Then two-stage time effect process is carried out.Described two-stage time effect is processed and is specially：At 110 DEG C, insulation 10h carries out one
Level Ageing Treatment, is continuously heating to 160 DEG C after the completion of insulation, insulation 36h carries out secondary time effect process.
Described heat treatment temperature rise period 10 °/s of heating rate, quenching shift time is less than 16s, and hardening media is room temperature
Water.
Embodiment 3：
A kind of Technology for Heating Processing for improving 7 line aluminium alloy anti intercrystalline corrosion performances and anti-stress corrosion performance, including twin-stage
Solid solution, quenching, two-stage time effect heat treatment.One-level solution treatment is carried out first, by sample by certain heating rate with stove heat
To 460 DEG C, 0.5h being incubated, continuing after the completion of insulation 485 DEG C to be warming up to stove, insulation 2h carries out two grades of solution treatment.Solid solution is tied
Transfer of pulling up a horse after bundle is quenched and is cooled to room temperature.Then two-stage time effect process is carried out.
Described two-stage time effect is processed and is specially：At 140 DEG C, insulation 10h carries out one-level Ageing Treatment, after the completion of insulation
170 DEG C are continuously heating to, insulation 36h carries out secondary time effect process.
Described heat treatment temperature rise period 10 °/s of heating rate, quenching shift time is less than 16s, and hardening media is room temperature
Water.
Embodiment 4：
A kind of Technology for Heating Processing for improving 7 line aluminium alloy anti intercrystalline corrosion performances and anti-stress corrosion performance, including twin-stage
Solid solution, quenching, two-stage time effect heat treatment.One-level solution treatment is carried out first, by sample by certain heating rate with stove heat
To 460 DEG C, 2h being incubated, continuing after the completion of insulation 500 DEG C to be warming up to stove, insulation 2h carries out two grades of solution treatment.Solid solution terminates
Transfer of pulling up a horse afterwards is quenched and is cooled to room temperature.Then two-stage time effect process is carried out.
Described two-stage time effect is processed and is specially:At 140 DEG C, insulation 2h carries out one-level Ageing Treatment, and insulation completes follow-up
Continue and 150 DEG C are warming up to, insulation 16h carries out secondary time effect process.
Described heat treatment temperature rise period 10 °/s of heating rate, quenching shift time is less than 16s, and hardening media is room temperature
Water.
Embodiment 5：
A kind of Technology for Heating Processing for improving 7 line aluminium alloy anti intercrystalline corrosion performances and anti-stress corrosion performance, including twin-stage
Solid solution, quenching, two-stage time effect heat treatment.One-level solution treatment is carried out first, by sample by certain heating rate with stove heat
To 460 DEG C, 2h being incubated, continuing after the completion of insulation 500 DEG C to be warming up to stove, insulation 2h carries out two grades of solution treatment.Solid solution terminates
Transfer of pulling up a horse afterwards is quenched and is cooled to room temperature.Then two-stage time effect process is carried out.
Described two-stage time effect is processed and is specially:At 120 DEG C, insulation 8h carries out one-level Ageing Treatment, and insulation completes follow-up
Continue and 170 DEG C are warming up to, insulation 24h carries out secondary time effect process.
Embodiment 6：
A kind of Technology for Heating Processing for improving 7 line aluminium alloy anti intercrystalline corrosion performances and anti-stress corrosion performance, including twin-stage
Solid solution, quenching, two-stage time effect heat treatment.First sample being carried out double_stage guide process, 2h is incubated at 460 DEG C, then heats up
To 495 DEG C and 2h is incubated, then quenches and be cooled to room temperature.
Two-stage time effect process is subsequently carried out：Sample being carried out one-level Ageing Treatment, 110 DEG C is warming up to stove, is incubated 12h.
Insulation carries out second level Ageing Treatment after terminating, and is continuously heating to 170 DEG C, is incubated 24h.
Described heat treatment temperature rise period 10 °/s of heating rate, quenching shift time is less than 16s, and hardening media is room temperature
Water.
Embodiment 7：
A kind of Technology for Heating Processing for improving 7 line aluminium alloy anti intercrystalline corrosion performances and anti-stress corrosion performance, including twin-stage
Solid solution, quenching, two-stage time effect heat treatment.First sample being carried out double_stage guide process, 1h is incubated at 450 DEG C, then heats up
To 495 DEG C and 1h is incubated, then quenches and be cooled to room temperature.
Then by solution treatment and the sample after quenching carries out two-stage time effect process：Sample is carried out one-level Ageing Treatment,
120 DEG C are warming up to stove, are incubated 8h.Insulation carries out second level Ageing Treatment after terminating, and is continuously heating to 160 DEG C, is incubated 22h.
Described heat treatment temperature rise period 10 °/s of heating rate, quenching shift time is less than 16s, and hardening media is room temperature
Water.
Embodiment 8：
A kind of Technology for Heating Processing for improving 7 line aluminium alloy anti intercrystalline corrosion performances and anti-stress corrosion performance, including twin-stage
Solid solution, quenching, two-stage time effect heat treatment.First sample being carried out double_stage guide process, 1h is incubated at 460 DEG C, then heats up
To 500 DEG C and 1h is incubated, then quenches and be cooled to room temperature.
Then by solution treatment and the sample after quenching carries out two-stage time effect process：Sample is carried out one-level Ageing Treatment,
110 DEG C are warming up to stove, are incubated 2h.Insulation carries out second level Ageing Treatment after terminating, and is continuously heating to 170 DEG C, is incubated 12h.
Described heat treatment temperature rise period 10 °/s of heating rate, quenching shift time is less than 16s, and hardening media is room temperature
Water.
Comparative example 1：
A kind of Technology for Heating Processing for improving 7 line aluminium alloy anti intercrystalline corrosion performances and anti-stress corrosion performance, including solid solution
Process, quench and aging strengthening model.Sample is carried out single-stage solution treatment, 450 DEG C is warming up to stove and is incubated 2h.After end
Quench and be cooled to room temperature, then carrying out upgrading Ageing Treatment is：8h is incubated at 120 DEG C, is continuously heating to be incubated at 160 DEG C
22h.
Described heat treatment temperature rise period 10 °/s of heating rate, quenching shift time is less than 16s, and hardening media is room temperature
Water.
Comparative example 2：
A kind of Technology for Heating Processing for improving 7 line aluminium alloy anti intercrystalline corrosion performances and anti-stress corrosion performance, including solid solution
Process, quench and aging strengthening model.Sample is carried out double_stage guide process, 1h is incubated at 450 DEG C, is then heated to 495
DEG C and be incubated 1h, double_stage guide heat treatment terminate after immediately transfer quenching, then at 140 DEG C insulation 30h carry out one-level timeliness
Process.
Described heat treatment temperature rise period 10 °/s of heating rate, quenching shift time is less than 16s, and hardening media is room temperature
Water.
In above-described embodiment and comparative example, the performance of solid solution aging system and alloy is shown in Table 2.
The parameters value of alloy under the different solid solution aging systems of table 2
Shown by Fig. 1, Fig. 2, processed using the double_stage guide two-stage time effect of the present invention, thick second phase in alloy substrate
Quantity is significantly reduced, and the spread is higher.
From the various performance parameters in comparative example 1, comparative example 2, at one pole solid solution or the place of single-stage aging system
Under reason, it is impossible to obtain optimal performance.
Can be seen that intercrystalline corrosion depth now is minimum by embodiment 8, while its intensity, hardness and anti-stress corrosion performance
Tool is good.
Claims (2)
1. a kind of Technology for Heating Processing for improving 7 line aluminium alloy anti intercrystalline corrosion performances and anti-stress corrosion performance, its feature includes
Following steps：
(1) double_stage guide heat treatment is carried out to 7 line aluminium alloys, sample is heated up with stove, temperature be first raised to 440 DEG C～
460 DEG C carry out one-level solution heat treatment, 0.5～2h of process time；Again temperature being increased to 475 DEG C～500 DEG C carries out the second level
Solution treatment, 0.5～2h of process time；
(2) Quenching Treatment being carried out after double_stage guide heat treatment terminates, and being cooled to room temperature state, hardening media is room temperature water；
(3) and then with stove, sample being warmed up to 110 DEG C～140 DEG C carries out one-level low temperature aging process, and aging time is 2～12h；
(4) being subsequently warmed up to 150 DEG C～170 DEG C carries out second level high-temperature aging process, and second level aging time 16～
36h.
2. the heat treatment for improving 7 line aluminium alloy anti intercrystalline corrosion performances and anti-stress corrosion performance according to claim 1
Technique, it is characterised in that：In step (2), quenching shift time is less than 16 seconds.
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| CN107022725A (en) * | 2017-04-20 | 2017-08-08 | 北京科技大学 | A kind of Technology for Heating Processing for improving ageing strengthening type Al Mg Zn alloy corrosion among crystalline grains |
| CN108118273A (en) * | 2017-12-11 | 2018-06-05 | 中南大学 | A kind of method for improving aluminium alloy corrosion resistance |
| CN108588599A (en) * | 2018-03-30 | 2018-09-28 | 燕山大学 | A kind of ultralight high-strength aluminum alloy heat treatment method |
| CN108950440A (en) * | 2018-07-17 | 2018-12-07 | 苏州温锑姆精密机械有限公司 | Aluminium alloy plate processing technology |
| CN108977739A (en) * | 2018-08-07 | 2018-12-11 | 中南大学 | Aging treatment process that is a kind of while improving intensity of aluminum alloy and anti-stress corrosion performance |
| CN111020423A (en) * | 2019-12-27 | 2020-04-17 | 北京首航科学技术开发有限公司 | Light ultrahigh-strength aluminum alloy nut and aluminum alloy material |
| CN111487129A (en) * | 2020-04-16 | 2020-08-04 | 江苏豪然喷射成形合金有限公司 | Method for testing room-temperature tensile mechanical properties of 7055 ultra-high-strength aluminum alloy extruded material formed by spraying |
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| CN115927982A (en) * | 2022-11-15 | 2023-04-07 | 福建祥鑫新材料科技有限公司 | Heat treatment method for improving corrosion performance of 7-series aluminum alloy |
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| CN108588599A (en) * | 2018-03-30 | 2018-09-28 | 燕山大学 | A kind of ultralight high-strength aluminum alloy heat treatment method |
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