CN108707793A - A method of improving 750MPa grades of ultra-high-strength aluminum alloy corrosive natures - Google Patents
A method of improving 750MPa grades of ultra-high-strength aluminum alloy corrosive natures Download PDFInfo
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- CN108707793A CN108707793A CN201810555645.XA CN201810555645A CN108707793A CN 108707793 A CN108707793 A CN 108707793A CN 201810555645 A CN201810555645 A CN 201810555645A CN 108707793 A CN108707793 A CN 108707793A
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- aluminum alloy
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
- C22C21/10—Alloys based on aluminium 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
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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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Abstract
The invention belongs to ultra-high-strength aluminum alloy technologies of preparing, are related to a kind of method improving 750MPa grades of ultra-high-strength aluminum alloy corrosive natures.Modified product is carried out solution hardening by the present invention, then 1 to 3 subzero treatments are carried out, last ageing treatment, the dislocation largely to interact and subgrain can be formed by this way, promote the formation of the interrupted precipitated phase of crystal boundary, it can make in the case that alloy keeps 750MPa grade of strength level constant after timeliness, corrosive nature significantly improves, while institutional framework is more stable.The present invention is suitable for 750MPa grades of ultra-high-strength aluminum alloy planks of high-performance or extrudate used in Aeronautics and Astronautics, weapons field.Plank after hot-working or extrudate are formed into supersaturated solid solution by solution treatment, and it controls and a degree of recrystallization occurs, the dislocation and subgrain of a large amount of vacancy and elementide and interaction are formed during subsequent subzero treatment, the crystal boundary structure structure for improving alloy after artificial aging is handled promotes the formation that phase structure is discontinuously precipitated.
Description
Technical field
The invention belongs to ultra-high-strength aluminum alloy technologies of preparing, are related to a kind of 750MPa grades of ultra-high-strength aluminum alloy corrosivity of improvement
The method of energy.
Background technology
Ultra-high-strength aluminum alloy has density is small, intensity is high, machine adds superior performance, specific strength is high and corrosion resistance is good etc.
Advantage is widely used in aerospace and other national defense industry, is one of the primary structural material of current aerospace industry.
With the continuous improvement that aerospace high life, low cost require, the requirement to structural material is also continuously improved, and comprehensive performance is excellent
Good ultra-high-strength aluminum alloy is further widely applied due to its excellent comprehensive performance and higher specific strength.
Under the driving of past high intensity design philosophy, scientific research personnel improves the strength level of alloy by being continually striving to,
Intensity can be made to reach 800MPa or more or even 1000MPa by the way of powder metallurgy or jet deposition, but due to its cost
Too high and other limited performances do not obtain always larger popularization and application.It is carried as aluminium alloy equipment and metallurgical technology are horizontal
Height can prepare 750MPa grades or more of ultra-high-strength aluminum alloy by common casting technology at present.Bond material numerology
Analysis will reach so high intensity, alloying component total content substantially 14% or more, due to alloy constituent concentration very
Height, the grain boundaries of alloy remain very more and larger-size remaining Second Phase Particle in hot procedure, subsequent solid
Molten and ageing treatment can not be eliminated well.The fracture analysis particle of grain boundaries easily causes crystal boundary combination strength reduction,
It is easy to that intergranular crack occurs during use, expected superhigh intensity level is not achieved, while in corrosive environment, these are big
Particle mutually mutually take the lead in dissolving as anode, cause corrosive nature poor.It is to pass through difference in presently disclosed report
Mode makes alloy reach higher intensity, and the comprehensive performance of the ultra-high-strength aluminum alloy to 750MPa grades or more, especially corrodes
The matching of performance does not have open report.
Invention content
The purpose of the present invention is to propose to a kind of methods improving 750MPa grades of ultra-high-strength aluminum alloy corrosive natures.
The applicable alloying component of technical solution of the invention and weight percent are：Master alloying element Zn 11~
13%, Cu 1.00~2.5%, Mg 1.0~2.5%, micro alloying element Zr 0.05~0.20%, Sc 0.05~
0.25%, Si≤0.10%, Fe≤0.10%, Ti≤0.10%, individually≤0.05%, total amount≤0.15% is remaining for other impurity
Amount be Al, applicable 750MPa grade ultra-high-strength aluminum alloy modified products be plank or extrudate,
It is characterized in that, after modified product is carried out solution treatment, 1~3 subzero treatment is carried out, then carries out timeliness again
Processing, step are：
1.1, solution treatment：Modified product after cold deformation is heated to 468~473 DEG C, is cut according to modified product maximum
Face thickness t/mm determines that soaking time, soaking time are t × (4.5~6.0)/min, and then product is put into room temperature water and is carried out
Quenching；
1.2, subzero treatment：Using slow cooling+long-time deep cooling+be slowly returned to technique of room temperature, specially 8~
10h cools to -150~-180 DEG C from room temperature, under the low temperature keep the temperature 18~for 24 hours, room temperature is returned in 10~15h；
1.3, ageing treatment：Two-stage time effect process：2~20h is kept the temperature at a temperature of 90 DEG C~110 DEG C, is then warming up to stove
130 DEG C~145 DEG C, 2~20h is kept the temperature, is then taken out air-cooled.
The present invention has the advantage that and advantageous effect：Present invention is generally directed to 750MPa grades and the above ultra-high-strength aluminum alloy at
Divide oversaturated feature, common fixation rates remnants second phase very more in crystal boundary and transgranular residual, grain boundary sites
Fracture analysis due to its size it is larger and it is in irregular shape cause crystal boundary bond strength low and corrosion failure easily occur, pass through
The mode of solid solution+deep cooling+timeliness of the present invention, can form the dislocation of a large amount of vacancy and elementide and interaction
And subgrain, improve the crystal boundary pattern and institutional framework of alloy after artificial aging processing, promotes the formation that phase structure is discontinuously precipitated, surely
Determine institutional framework, improve the potential strength of alloy, makes the feelings that alloy is not reduced in other performances eventually by ageing treatment adjustment
Under condition, corrosive nature is increased substantially.Using alloy its properties prepared by the present invention be tensile strength 765~
800MPa, yield strength is in 710~750MPa, and fracture toughness is in 27~35MPa*m1/2, anti-strip corrosive nature reach EB grades with
On, C Zernike annular polynomial corrosive natures are to test 30 days not crack under 200MPa stress, and the high comprehensive performance of alloy can be preferable
Meet aerospace and the application demand of other national defence weaponrys.
This technique be suitable for Aeronautics and Astronautics, 750MPa grades of ultra-high-strength aluminum alloy planks of high-performance used in weapons field or
Extrudate.Plank after hot-working or extrudate are formed into supersaturated solid solution by solution treatment, and it is certain to control generation
The recrystallization of degree forms the position of a large amount of vacancy and elementide and interaction during subsequent subzero treatment
Wrong and subgrain improves the crystal boundary structure structure of alloy after artificial aging processing, promotes the formation that phase structure is discontinuously precipitated, passes through
Make alloy in the case where other performances do not reduce after ageing treatment, corrosive nature obtains larger improvement.
Description of the drawings
Fig. 1 metallographics scan method of the tissue topography (a) through the present invention and handle；(b) without the method for the present invention processing.
Method of the pattern (a) through the present invention is handled after Fig. 2 Peeling Corrosions, EA grades；(b) without the method for the present invention processing, EC
Grade
Specific implementation mode
With reference to specific embodiment, the present invention is further illustrated, but the invention is not limited in following implementations
Example.
The present invention proposes a kind of method improving 750MPa grades of ultra-high-strength aluminum alloy modified product corrosive natures, the technique
Applicable alloying component and weight percent be：Master alloying element Zn 11~13%, Cu 1.00~2.5%, Mg 1.0~
2.5%, micro alloying element Zr 0.05~0.20%, Sc 0.05~0.25%, Si≤0.10%, Fe≤0.10%, Ti≤
0.10%, other impurity are single≤and 0.05%, total amount≤0.15%, surplus Al.The technique is suitable for 750MPa grades of high-performance
Ultra-high-strength aluminum alloy product is plank or extrudate.
The method of the 750MPa grades of ultra-high-strength aluminum alloy modified product corrosive natures of improvement proposed in technical solution of the present invention
It is：After modified product is carried out solution treatment, 1~3 subzero treatment is carried out, then carries out ageing treatment again, by this way
The dislocation and subgrain for forming a large amount of vacancy and elementide and interaction improve alloy after artificial aging is handled
Crystal boundary structure structure promotes the formation that phase structure is discontinuously precipitated, by making alloy not reduced in other performances after ageing treatment
In the case of, corrosive nature obtains larger improvement.It is mainly comprised the following steps：
1.1, solution treatment：Product after cold deformation is heated to 468~473 DEG C, according to product maximum cross-section thickness t
(mm) it determines that soaking time, total soaking time are t × (4.5~6.0) (min), then product is put into room temperature water and is quenched
Fire.
1.2, subzero treatment：Using slow cooling+long-time deep cooling+be slowly returned to technique of room temperature, specially 8~
10h slowly cools to -150~-180 DEG C from room temperature, under the low temperature keep the temperature 18~for 24 hours, 10~15h is slowly returned to room temperature；
1.3, ageing treatment：Two-stage time effect process：2~20h is kept the temperature at a temperature of 90 DEG C~110 DEG C, is then warming up to stove
130 DEG C~145 DEG C, 2~20h is kept the temperature, is then taken out air-cooled.
Embodiment one
Using the method according to the present invention for improving 750MPa grades of ultra-high-strength aluminum alloy modified product corrosive natures, pairing
Golden ingredient and weight percent are：Zn 10.5%, Cu 1.72%, Mg 1.95%, Zr 0.11%, Sc 0.10%, Ti
0.06%, Si 0.06%, Fe 0.08%, surplus Al, the extruded band plate that thickness is 45mm carry out solution treatment, solid solubility temperature
470 DEG C, soaking time 150min, room temperature water quenching.Band plate carries out 2.0% pre-stretching after quenching, then carries out subzero treatment：
- 160 DEG C are down to by room temperature, rate of temperature fall is 20 DEG C/h, keeps the temperature 20h, then heats to room temperature, and heating rate is 15 DEG C/h, then
Carry out artificial aging processing：100℃/10h+135℃/15h.Stretching, fracture toughness and the exfoliation Corrosion of band plate are measured,
And be compared with the performance by identical solid solution, pre-stretching and timeliness treated band plate, as shown in table 1, closed after processing
Pattern after the metallographic scanning tissue and Peeling Corrosion of gold is as shown in Figure 1 and Figure 2.
It can be found that after method through the invention is handled, intensity, the fracture toughness of alloy are substantially suitable, and corrosive nature obtains
It must significantly improve.
Performance compares the method for 1 present invention of table before and after the processing
Embodiment two
Using the method according to the present invention for improving 750MPa grades of ultra-high-strength aluminum alloy modified product corrosive natures, pairing
Golden ingredient and weight percent are：Zn 11.3%, Cu 1.94%, Mg 2.16%, Zr 0.10%, Sc 0.12%, Ti
0.05%, Si 0.07%, Fe 0.06%, surplus Al, the extruded band plate that thickness is 45mm carry out solution treatment, solid solubility temperature
470 DEG C, soaking time 150min, room temperature water quenching.Band plate carries out 2.0% pre-stretching after quenching, then carries out deep cooling twice
Processing：It is down to -170 DEG C by room temperature, rate of temperature fall is 20 DEG C/h, keeps the temperature 22h, then heats to room temperature, heating rate is 15 DEG C/
H, then carry out artificial aging processing：100℃/12h+140℃/18h.Measure stretching, fracture toughness and the Peeling Corrosion of band plate
Performance, and be compared with the performance by identical solid solution, pre-stretching and timeliness treated band plate, as shown in table 2.
It can be found that after method through the invention is handled, intensity, the fracture toughness of alloy are substantially suitable, and corrosive nature obtains
It must significantly improve.
Performance compares the method for 2 present invention of table before and after the processing
Embodiment three
Using the method according to the present invention for improving 750MPa grades of ultra-high-strength aluminum alloy modified product corrosive natures, pairing
Golden ingredient and weight percent are：Zn 11.5%, Cu2.04%, Mg 1.76%, Zr 0.12%, Sc 0.15%, Ti
0.06%, Si 0.04%, Fe 0.08%, surplus Al, the extruded band plate that thickness is 45mm carry out solution treatment, solid solubility temperature
470 DEG C, soaking time 150min, room temperature water quenching.Band plate carries out 2.0% pre-stretching after quenching, then carries out deep cooling three times
Processing：It is down to -175 DEG C by room temperature, rate of temperature fall is 20 DEG C/h, keeps the temperature 18h, then heats to room temperature, heating rate is 15 DEG C/
H, then carry out artificial aging processing：110℃/15h+135℃/15h.Measure stretching, fracture toughness and the Peeling Corrosion of band plate
Performance, and be compared with the performance by identical solid solution, pre-stretching and timeliness treated band plate, as shown in table 3.
It can be found that after method through the invention is handled, intensity, the fracture toughness of alloy are substantially suitable, and corrosive nature obtains
It must significantly improve.
Performance compares the method for 3 present invention of table before and after the processing
Claims (1)
1. a kind of method improving 750MPa grades of ultra-high-strength aluminum alloy modified product corrosive natures, the applicable alloying component of this method
And weight percent is：Master alloying element Zn 11~13%, Cu 1.00~2.5%, Mg 1.0~2.5%, microalloying
Element Zr 0.05~0.20%, Sc 0.05~0.25%, Si≤0.10%, Fe≤0.10%, Ti≤0.10%, other impurity
Individually≤0.05%, total amount≤0.15%, surplus Al, applicable 750MPa grade ultra-high-strength aluminum alloy modified product be plank or
Extrudate,
It is characterized in that, after modified product is carried out solution treatment, 1~3 subzero treatment is carried out, is then carried out at timeliness again
Reason, step are：
1.1, solution treatment：Modified product after cold deformation is heated to 468~473 DEG C, according to modified product maximum cross-section thickness
Degree t/mm determines that soaking time, soaking time are t × (4.5~6.0)/min, and then product is put into room temperature water and is quenched
Fire；
1.2, subzero treatment：Using slow cooling+long-time deep cooling+be slowly returned to technique of room temperature, specially 8~10h from
Room temperature cools to -150~-180 DEG C, under the low temperature keep the temperature 18~for 24 hours, room temperature is returned in 10~15h；
1.3, ageing treatment：Two-stage time effect process：2~20h is kept the temperature at a temperature of 90 DEG C~110 DEG C, is then warming up to 130 DEG C with stove
~145 DEG C, 2~20h is kept the temperature, is then taken out air-cooled.
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109457198A (en) * | 2018-11-16 | 2019-03-12 | 中南大学 | A kind of aluminum alloy materials and preparation method thereof of the anti-corrosion low stress of superhigh intensity |
| CN110230014A (en) * | 2019-06-04 | 2019-09-13 | 燕山大学 | A method of regulation aluminum alloy forge piece grain structure uniformity |
| CN110396629A (en) * | 2019-08-16 | 2019-11-01 | 中国航发北京航空材料研究院 | A kind of 800MPa grades of aluminum alloy extrusion section bar and preparation method thereof |
| CN111575542A (en) * | 2020-05-03 | 2020-08-25 | 上海工程技术大学 | Amorphous reinforced aluminum alloy composite material and preparation method thereof |
| CN112680587A (en) * | 2020-11-12 | 2021-04-20 | 淮阴工学院 | Method for improving hardness of aluminum-magnesium alloy welding wire |
| CN112877622A (en) * | 2021-04-21 | 2021-06-01 | 中国航发北京航空材料研究院 | Non-isothermal heat treatment method of 7000 series aluminum alloy |
| CN113308652A (en) * | 2021-04-27 | 2021-08-27 | 沈阳工业大学 | Corrosion-resistant strengthening process combining aluminum alloy regression and reaging and cryogenic treatment |
| CN113373333A (en) * | 2021-05-27 | 2021-09-10 | 湖南瀚德微创医疗科技有限公司 | Low-elasticity high-strength aluminum alloy amplitude transformer and preparation method thereof |
| CN114703409A (en) * | 2022-06-06 | 2022-07-05 | 中国航发北京航空材料研究院 | High-strength corrosion-resistant aluminum alloy and casting method thereof |
| CN114737142A (en) * | 2022-06-13 | 2022-07-12 | 中国航发北京航空材料研究院 | Low-stress corrosion-resistant preparation method for aluminum alloy casting through vibratory aging and cryogenic treatment |
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109457198A (en) * | 2018-11-16 | 2019-03-12 | 中南大学 | A kind of aluminum alloy materials and preparation method thereof of the anti-corrosion low stress of superhigh intensity |
| CN110230014A (en) * | 2019-06-04 | 2019-09-13 | 燕山大学 | A method of regulation aluminum alloy forge piece grain structure uniformity |
| CN110396629B (en) * | 2019-08-16 | 2021-04-20 | 中国航发北京航空材料研究院 | 800 MPa-grade aluminum alloy extruded section and preparation method thereof |
| CN110396629A (en) * | 2019-08-16 | 2019-11-01 | 中国航发北京航空材料研究院 | A kind of 800MPa grades of aluminum alloy extrusion section bar and preparation method thereof |
| CN111575542A (en) * | 2020-05-03 | 2020-08-25 | 上海工程技术大学 | Amorphous reinforced aluminum alloy composite material and preparation method thereof |
| CN111575542B (en) * | 2020-05-03 | 2021-04-06 | 上海工程技术大学 | Amorphous reinforced aluminum alloy composite material and preparation method thereof |
| CN112680587A (en) * | 2020-11-12 | 2021-04-20 | 淮阴工学院 | Method for improving hardness of aluminum-magnesium alloy welding wire |
| CN112877622A (en) * | 2021-04-21 | 2021-06-01 | 中国航发北京航空材料研究院 | Non-isothermal heat treatment method of 7000 series aluminum alloy |
| CN112877622B (en) * | 2021-04-21 | 2021-07-23 | 中国航发北京航空材料研究院 | Non-isothermal heat treatment method of 7000 series aluminum alloy |
| CN113308652A (en) * | 2021-04-27 | 2021-08-27 | 沈阳工业大学 | Corrosion-resistant strengthening process combining aluminum alloy regression and reaging and cryogenic treatment |
| CN113373333A (en) * | 2021-05-27 | 2021-09-10 | 湖南瀚德微创医疗科技有限公司 | Low-elasticity high-strength aluminum alloy amplitude transformer and preparation method thereof |
| CN113373333B (en) * | 2021-05-27 | 2022-03-11 | 湖南瀚德微创医疗科技有限公司 | Low-elasticity high-strength aluminum alloy amplitude transformer and preparation method thereof |
| CN114703409A (en) * | 2022-06-06 | 2022-07-05 | 中国航发北京航空材料研究院 | High-strength corrosion-resistant aluminum alloy and casting method thereof |
| CN114737142A (en) * | 2022-06-13 | 2022-07-12 | 中国航发北京航空材料研究院 | Low-stress corrosion-resistant preparation method for aluminum alloy casting through vibratory aging and cryogenic treatment |
| CN114737142B (en) * | 2022-06-13 | 2022-08-30 | 中国航发北京航空材料研究院 | Low-stress corrosion-resistant preparation method for aluminum alloy casting through vibratory aging and cryogenic treatment |
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Application publication date: 20181026 |