CN106521379A - Heat treatment method of high-strength and high-flexibility 7055 aluminum alloy - Google Patents
Heat treatment method of high-strength and high-flexibility 7055 aluminum alloy Download PDFInfo
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- CN106521379A CN106521379A CN201611182214.0A CN201611182214A CN106521379A CN 106521379 A CN106521379 A CN 106521379A CN 201611182214 A CN201611182214 A CN 201611182214A CN 106521379 A CN106521379 A CN 106521379A
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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
Abstract
The invention discloses a heat treatment method of a high-strength and high-flexibility 7055 aluminum alloy. The heat treatment method comprises the steps of double-stage solid solution and T6 manual aging in sequence; after the T6 manual aging step is finished, the high-temperature destressed aging is performed, that is, the insulation is performed by 8-10 hours at 140-150 DEG C; the double-stage solid solution step is to heat a product from the room temperature to 445-455 DEG C along with a furnace for insulation by 0.5-4 hours, to heat the product to 465-480 DEG C by 0.5 hour for insulation 0.5-4 hours and to quench the product at a water temperature of 40-50 DEG C; and the T6 manual aging step is to heat the product from the room temperature to 115-125 DEG C along with the furnace for insulation by 20-26 hours. The heat treatmeetn method maintains higher material strength level, can efficiently reduce residual stress of a sprayed 7055 aluminum alloy product, and meanwhile, improves comprehensive performances of the product. The heat treatment method solves the cracking problem of the product in subsequent machining process, reduces the machining deformation of the product, and improves the size precision.
Description
Technical field
The invention belongs to the technical field of heat treatment of non-ferrous metal, and in particular to 7055 aluminium alloy of high intensity high-flexibility
Heat treatment method.
Background technology
7055 aluminium alloys have the characteristic of high intensity and high-flexibility, are with Zn, Mg, Cu as main reinforced alloys element
7XXX systems (Al-Zn-Mg-Cu) aluminium alloy, its Zn content highest has the advantages that density is little, intensity is high, plasticity good, is to work as
Front widely used high-intensity high-tenacity aluminium alloy；Using spray deposition processing produce 7055 aluminium alloys, with crystal grain it is tiny,
Even tissue is fine and close, without the advantages of gross segregation.
7055 belong to heat-treatable strengthened aluminum alloy, can be greatly improved by the intensity of various heat treating regimes 7055, such as
Reaction-injection moulding 7055-T6 states tensile strength improves 227% compared with 220MPa under O states up to 720MPa, but at the same time, at heat
After reason, the residual stress of material is greatly improved, and is not suitable for using under the complex working conditions such as stress corrosion, alternate load；For drop
Low residual stress, improves the combination properties such as toughness, stress corrosion resistant, many heat treating regimes such as T76, T74, T73, T77, T79
Developed in succession, in these heat treating regimes, T76, T74, T73 are the timeliness of two grades of overaging and second level timeliness
Time progressively extends, and with the prolongation of aging time, the residual stress of alloy product is gradually lowered, stress corrosion resistant ability,
The indexs such as fracture toughness, the contraction percentage of area, electrical conductivity are stepped up, but at the same time intensity is also being gradually lowered.
General for same alloy, high intensity-low stress is conflicting, and while improving intensity, alloy is interior
Stress is also greatly improved, and this brings many inconvenience to follow-up machining, in high strength alumin ium alloy in quenching heat treatment and machining
During, its internal inevitably introducing residual stress, high-caliber residual stress reduce the practicality of 7055 aluminium alloys,
It is mainly reflected in：
High residual stress aluminium alloy element deforms serious even cracking in follow-up machining process and scraps.
2. to avoid residual stress in the course of processing from causing component cracking, the process for machining of high residual stress component is tight
Lattice are limited：If the requirement that processing mode can not use wire cutting, machine tool is selected and the depth of cut is controlled is compared with common aluminum alloy
Component is more harsh, and the techniques such as low temperature aging destressing or the school shape of multi-pass are usually associated with machining process,
These factors all reduce the production efficiency of component, improve its production cost.
3. high residual stress reduces the combination property of component, and research shows, high residual stress causes the crackle of component quick
Perception is improved, and stress corrosion resistant ability and fatigue behaviour are reduced.
The abatement technology of traditional residual stress is concentrated mainly on the following aspects：Mechanical stretching/compression method, low temperature aging
Method, the vibrations statutes of limitations；In these methods, mechanical stretching/compression method is high to equipment requirements and deflection hardly possible is controlled, low temperature aging
The poorly efficient fruit of method efficiency is poor, and the maturation mechanism research not enough of vibrations statutes of limitations related process is not enough fully, remaining in aluminium alloy at present
Also do not have in the abatement technique of stress a kind of technique be provided simultaneously with it is efficient, practical, the characteristics of easily promote.
For 7055 aluminium alloys, if adopting secondary time effect, i.e. T76/T74/T73, the temperature of its first order timeliness is 120
DEG C, the temperature of second level timeliness is 160 DEG C；If continuing artificial aging after T6 peak timeliness, as the artificially aged time prolongs
Long or temperature rises, and the stress level of alloy is gradually lowered, but Conventional cryogenic timeliness (being less than 120 DEG C) the poorly efficient fruit of efficiency is poor, reaches
To or can then cause mechanical property to decline rapidly more than one-level aging temp (120 DEG C)；For 7055 aluminium alloy of reaction-injection moulding,
There is certain temperature range between first order timeliness (120 DEG C) and second level timeliness (160 DEG C), can be in the interval long-time
Material mechanical performance is incubated and maintains, and adopts 7055 aluminium alloys of semi-continuous casting production intensity to be incubated then in the temperature range
Can be greatly lowered；For the feature, a set of high-temperature aging destressing process program is developed, replace traditional handicraft, can be significantly
Improve work efficiency and destressing effect.
The content of the invention
It is an object of the invention to overcome above-mentioned the deficiencies in the prior art, there is provided 7055 aluminium alloy of high intensity high-flexibility
Heat treatment method.
The heat treatment method of 7055 aluminium alloy of high intensity high-flexibility, includes successively：Double_stage guide and T6 artificially ageds
Step, it is characterised in that：After the completion of the step of T6 artificial agings, high temperature destressing timeliness is carried out, i.e., protected at 140-150 DEG C
Warm 8-10 hours.
Preferably, the step of the double_stage guide it is：Product is risen to into 445-455 DEG C by room temperature with stove, 0.5-4 is little for insulation
When, rise to 465-480 DEG C within 0.5 hour, be incubated 0.5-4 hours, 40-50 DEG C of water temperature quenching.
Preferably, the step of the T6 artificial agings it is：Product is risen to into 115-125 DEG C by room temperature with stove, 20-26 is incubated
Hour.
Preferably, the double_stage guide step and the step of T6 artificial agings between interlude be not more than 4 hours.
Compared with prior art, beneficial effects of the present invention：
1) solid solution
The double_stage guide mode combined using high/low temperature, double_stage guide are also known as Intensive intervention, i.e., first in a certain thermostatic
Insulation a period of time, a higher temperature is heated to certain heating rate then and a period of time is incubated, it is subsequently quick
Cooling.Correlational study shows, in the case where subsequent institution of prescription is the same, Intensive intervention is more advantageous, can not be by carrying
High-alloying element total content improving the degree of supersaturation of solid solution, so as to reduce thick not molten crystalline phase, for raising
Precipitation degree and improve tensile property there is positive effect, be the effective way for improving aluminium alloy combination property.
2) peak timeliness
Using the process of single-stage peak timeliness, the alloying element of solid solution in aluminum substrate can effectively be separated out, be reached by peak timeliness process
Optimal reinforcing effect.
3) high temperature destressing timeliness
Temperature 140-150 DEG C, the single-stage peak timeliness temperature higher than 120 DEG C and be less than 160 DEG C, when 7055 aluminum of reaction-injection moulding close
When gold needs to carry out T76/T74/T73 aging strengthening models, 160 DEG C can be typically selected as secondary time effect temperature, at such a temperature
Insulation, with the prolongation of aging time, the intensity of alloy is gradually lowered；And select to be incubated at 140-150 DEG C, can vital
Product keeps the intensity level of T6 states, while interiors of products residual stress is greatly lowered, and improves stress corrosion resistant ability, breaks
Split the indexs such as toughness, the contraction percentage of area, electrical conductivity.
Jing actual products are tested, and the product after to T6 heat treatments carries out the combination of high temperature destressing Ageing Treatment, are sprayed
The combination property for penetrating 7055 alloy products of shaping is effectively improved, and is efficiently solved product and become in machining process
The problem of shape and cracking.
Description of the drawings
Fig. 1 is the schematic flow sheet of the heat treatment method of 7055 aluminium alloy of high intensity high-flexibility of the present invention.
Specific embodiment
Referring to Fig. 1, the heat treatment method of 7055 aluminium alloy of high intensity high-flexibility, include successively：Double_stage guide and T6 people
The step of man-hour imitates, it is characterised in that：After the completion of the step of T6 artificial agings, high temperature destressing timeliness is carried out, i.e., in 140-
8-10 hours are incubated at 150 DEG C.
The step of double_stage guide is：Product is risen to into 445-455 DEG C by room temperature with stove, insulation 0.5-4 hours, 0.5
Hour rises to 465-480 DEG C, is incubated 0.5-4 hours, 40-50 DEG C of water temperature quenching.
The step of T6 artificial agings is：Product is risen to into 115-125 DEG C by room temperature with stove, 20-26 hours are incubated.
Between the step of double_stage guide step and T6 artificial agings, interlude is not more than 4 hours.
Embodiment 1
7055 aluminium alloy spray forming ingots are extruded into (extrusion ratio 14.8) Jing after railway carriage into Φ 130mm bars, by the rod
Material roughing carries out heat treatment to blank into certain product blank, and heat treatment step is followed successively by：
A) double_stage guide is processed, and room temperature rises to 450 DEG C for 2 hours, and 450 DEG C are incubated 3 hours, rise within 0.5 hour 477 DEG C, and 477
DEG C insulation 3 hours, the quenching of 50 DEG C of water temperatures.
B) T6 artificial agings are processed, and room temperature rises to 120 DEG C for 1 hour, and 120 DEG C are incubated 24 hours.
C) high temperature destressing timeliness, is incubated 10 hours at 140 DEG C.
In the above-described embodiments, product blank of the contrast without high temperature destressing timeliness, Jing after high temperature destressing timeliness,
In follow-up machining process, deflection is reduced, and intensity measurement performance keeps same level substantially, and electrical conductivity and the contraction percentage of area
Certain lifting has been obtained, the purpose for maintaining intensity level, reducing residual stress, lift combination property, its measured performance has been reached
Contrast is shown in Table 1.
Performance comparison before and after 1 high temperature destressing timeliness of table
Technical solution of the present invention is exemplarily described to invention above in conjunction with accompanying drawing, it is clear that the present invention is implemented
It is not subject to the restrictions described above, as long as employ the various unsubstantialities that the method for the present invention is conceived and technical scheme is carried out changing
Enter, or it is not improved the design of invention and technical scheme are directly applied to into other occasions, in protection scope of the present invention
Within.
Claims (4)
1. the heat treatment method of 7055 aluminium alloy of high intensity high-flexibility, includes successively：Double_stage guide and T6 artificially ageds step
Suddenly, it is characterised in that：After the completion of the step of T6 artificial agings, high temperature destressing timeliness is carried out, i.e., be incubated at 140-150 DEG C
8-10 hours.
2. the heat treatment method of 7055 aluminium alloy of high intensity high-flexibility as claimed in claim 1, it is characterised in that：It is described double
Level solid solution the step of be：Product is risen to into 445-455 DEG C by room temperature with stove, 0.5-4 hours is incubated, is risen to 465-480 within 0.5 hour
DEG C, it is incubated 0.5-4 hours, 40-50 DEG C of water temperature quenching.
3. the heat treatment method of 7055 aluminium alloy of high intensity high-flexibility as claimed in claim 1, it is characterised in that：The T6
The step of artificial aging is：Product is risen to into 115-125 DEG C by room temperature with stove, 20-26 hours are incubated.
4. the heat treatment method of 7055 aluminium alloy of high intensity high-flexibility as claimed in claim 1, it is characterised in that：It is described double
Between the step of level solutionizing step and T6 artificial agings, interlude is not more than 4 hours.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109487187A (en) * | 2018-12-29 | 2019-03-19 | 江苏豪然喷射成形合金有限公司 | A kind of low temperature aging of super high Zn content aluminium alloy and multistage heat treatment process |
| CN113278900A (en) * | 2020-02-20 | 2021-08-20 | 核工业理化工程研究院 | Solid solution treatment method of Al-Zn-Mg-Cu series high-strength aluminum alloy |
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| CN103572181A (en) * | 2013-10-12 | 2014-02-12 | 江苏豪然喷射成形合金有限公司 | Thermal treatment method of lowering stress for spraying and forming 7055 aluminum alloy forged piece |
| WO2015131992A1 (en) * | 2014-03-06 | 2015-09-11 | Constellium Rolled Products Ravenswood, Llc | A 7xxx alloy for defence applications with a balanced armor piercing-fragmentation performance |
| CN105200359A (en) * | 2015-10-16 | 2015-12-30 | 江苏豪然喷射成形合金有限公司 | Heat treatment method capable of reducing stress of spray-formed 7000 series aluminum alloy products |
| CN105239028A (en) * | 2014-06-27 | 2016-01-13 | 孟源 | Two-stage aging treatment technology for 7075 aluminum alloy |
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Patent Citations (5)
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| CN1834281A (en) * | 2005-12-06 | 2006-09-20 | 北京有色金属研究总院 | Two-stage forced solution treatment method for high strength deformed aluminum alloy |
| CN103572181A (en) * | 2013-10-12 | 2014-02-12 | 江苏豪然喷射成形合金有限公司 | Thermal treatment method of lowering stress for spraying and forming 7055 aluminum alloy forged piece |
| WO2015131992A1 (en) * | 2014-03-06 | 2015-09-11 | Constellium Rolled Products Ravenswood, Llc | A 7xxx alloy for defence applications with a balanced armor piercing-fragmentation performance |
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| CN109487187A (en) * | 2018-12-29 | 2019-03-19 | 江苏豪然喷射成形合金有限公司 | A kind of low temperature aging of super high Zn content aluminium alloy and multistage heat treatment process |
| CN113278900A (en) * | 2020-02-20 | 2021-08-20 | 核工业理化工程研究院 | Solid solution treatment method of Al-Zn-Mg-Cu series high-strength aluminum alloy |
| CN113278900B (en) * | 2020-02-20 | 2022-05-06 | 核工业理化工程研究院 | Solid solution treatment method of Al-Zn-Mg-Cu series high-strength aluminum alloy |
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Application publication date: 20170322 |