CN102796973B - Multistage aging treatment method for improving microstructure and comprehensive performance of 7xxx series aluminum alloy - Google Patents
Multistage aging treatment method for improving microstructure and comprehensive performance of 7xxx series aluminum alloy Download PDFInfo
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Abstract
The invention relates to an aging treatment method for improving multistage cooperation control of microstructure and comprehensive performance of a 7xxx series aluminum alloy, the method is characterized in that a preaging treatment is carried out in a relatively low temperature range, a ladder type aging treatment of a low temperature phase and a high temperature phase in order is carried out in a relatively high temperature range, the steps of quenching and cooling are carried out, and a reaging treatment is carried out in the relatively low temperature range. By using the technical means which are completely different with a current RRA treatment, such as cooperation of the low temperature zone preaging parameter and the high-temperature region aging parameter, the ladder type aging treatment of the low temperature phase and the high temperature phase in order are carried out in the relatively high temperature range and the like, thereby the optimal cooperation of an intra-grain precipitate phase and a grain boundary precipitate phase can be realized. The treatment method provided by the invention is capable of obviously improving the microstructure and the comprehensive performance of the 7xxx series aluminum alloy, the average size d of the alloy intra-grain precipitate phase is less than or equal to 12nm, the distance D of the grain boundary precipitated phase is greater than or equal to 25nm, and the alloy conductivity gamma can reach greater than or equal to more than 21.5Ms/m. The method has another advantage that under the prerequisite that the comprehensive property level of the alloy is not reduced, the method has the technical characteristics of easy operation and short flow and is in favor of enhancement of production efficiency.
Description
Technical field
The heat treating method of the aluminium alloy of technical field involved in the present invention, the heat treating method of the 7xxx particularly being registered by international aluminium association and China YouSe metal technical committee for standardization (TCST) system (Al-Zn-Mg-Cu system) aluminium alloy; More specifically, the present invention relates to have the multistage aging treatment process of remarkable intensity and the 7xxx line aluminium alloy of other over-all properties couplings.
Background technology
7xxx system (Al-Zn-Mg-Cu system) aluminium alloy is typical heat-treatable strengthened aluminum alloy, and aging technique process is to make it obtain high strength to mate one of the most key process procedure with other over-all propertieies.For this reason, since the fifties in last century, first practical 7xxx aluminium alloy was born, material supplier author is devoted to develop the timeliness novel process that can improve structure property always.Before the sixties in last century, the normal institution of prescription adopting of Al-Zn-Mg-Cu line aluminium alloy is peak value timeliness (T6), and object is to obtain maximum intensity.But this state main strengthening phase ShiGP district and a small amount of η ', crystal boundary is the continuous precipitate of chain, the anti-stress corrosion performance of this alloy is very unfavorable, corrosion passage is provided very easily to the development of stress corrosion cracking, makes stress corrosion cracking be easier to expansion.For head it off, material supplier author has developed T7x(T73, T74, T76, T79) twin-stage overaging system, wherein, first step timeliness is low temperature preageing, is nucleation stage; Second stage timeliness is high-temperature aging, is the stabilization stage.Low temperature preageing has strong impact to size, distribution and the density of the precipitated phase that high-temperature aging produces subsequently, contributes to the formation of η ' phase.Twin-stage overaging system is assembled η ' phase and the η phase particle on crystal boundary, has destroyed the continuity of Grain Boundary Precipitates, and tissue is improved, and has reduced stress corrosion and Peeling Corrosion susceptibility, has also improved the fracture toughness property of alloy.Therefore meanwhile, due to the strengthening phase particle generation alligatoring in crystal grain, when improving stress corrosion resistant ability, but take that to sacrifice 10～15% intensity be cost.These two-stage time effect systems have been widely used in the thermal treatment of the members such as airframe framework, Chuan Bi, wing cover, stiffening web, landing gear support component, rivet, but they have inevitably all lost certain static strength performance.
For solving this, be associated this problem of contradiction between golden intensity and anti-stress corrosion resistance, the Cina of Israel aircraft company in 1974 etc. has proposed a kind of three grades of aging techniques---regression and re-ageing treatment process (RRA), makes to return phenomenon in the Al-Zn-Mg-Cu breakthrough application that has been associated Jin Zhongyou.RRA processes and comprises three grades: the first step is carried out T6 peak value preageing at a lower temperature, and microstructure is identical with peak aged with performance; Carry out quenching after isothermal treatment for short time (tens seconds to several minutes) in the second stage (200 ℃～260 ℃) under comparatively high temps, after regression treatment, the coherence of intracrystalline or half coherence precipitated phase dissolve again in sosoloid, on crystal boundary, chain precipitated phase merges, gathers continuously, continuous distribution no longer, this crystal boundary structure has improved stress corrosion resistant and exfoliation Corrosion, and the dissolving of intracrystalline GP district and η ' greatly reduces the intensity of alloy; The third stage is timeliness more at a lower temperature, reaches peak strength, and intracrystalline is separated out tiny GP district and η ' phase, and disperse distributes, and crystal boundary is still discontinuous non-coherence precipitated phase.After RRA processes, intracrystalline is similar to organizing of T6 state, and crystal boundary is similar to T7 state, makes the unification of alloy acquisition high strength and good anti-stress corrosion performance.But unfortunately, because RRA technique needs processed at high temperature to expose in short-term, thereby can only be applied to compared with brief summary member, but for Working environment cause the even more serious slab of stress corrosion and heavy section casting helpless, this also become RRA system in industrialization, obtain application major obstacle.
On the basis of processing at RRA, material supplier author constantly carries out deep research and improvement to RRA technique, is mainly how significantly not reducing under prerequisite of assurance alloy over-all properties, to widen second stage aging time, to meet the needs of thick cross section production of articles as far as possible.The Aloca company of the U.S. in 1989 runs after fame and has registered the RRA processing specification that first can industrial application with T77 as-heat-treated condition, and the processing for 7150 sheet materials and extrusion by this technique, make it the anti-stress corrosion performance that has not only kept the intensity of T6 state but also reached T76 state.From existing bibliographical information, T77 resolving system patent all emphasizes that first step timeliness will be by alloy treatment to nearly peak strength state, although the temperature that they return by reducing the second stage, the time window of second stage regression treatment is obviously widened (the longest can reach several hours), can realize the regression treatment of thick cross section goods, but now timeliness parameter matching at different levels are unreasonable, the over-all properties of alloy product is difficult to reach the initial RRA treatment effect proposing of Cina.By the microtexture in above-mentioned three grades of institution of prescription processes and the systematic study of over-all properties, find, because the first step has adopted T6 peak ageing treatment, although alloy Grain Boundary Precipitates has been grown up to certain size and has been to a certain extent to disconnect and distributed, but meanwhile, matrix precipitate is also obviously grown up, when comparing the lower second stage temperature regression treatment of traditional RRA system, can back dissolving to the precipitated phase quantity in matrix obviously reduce, cannot realize the flesh and blood of " recurrence ", cause the third stage again Precipitation potentiality greatly reduce, finally, the over-all properties of alloy and real RRA treatment effect are far apart.For overcoming this shortcoming, the people such as the old Kang Hua of the Central South University application patent of invention CN101792891B of the Liao Yixiang People's Republic of China (PRC) in 2010, stated the aging treatment process of a kind of Al-Zn-Mg-Cu of improvement line aluminium alloy intensity and corrosion resistance, its invention technical scheme is: aging temp is 120 ℃ of insulation 24h, returning temperature is 170～200 ℃ of insulation 5-30min, return completely, carry out quench treatment or cool to aging temp again with the furnace, then aging temp is 120 ℃ of insulation 24h; After a regression and re-ageing, then carry out the processing of one or many regression and re-ageing.This technical scheme can make the enterprising one-step optimization in basis that is organized in a regression and re-ageing processing of Al-Zn-Mg-Cu line aluminium alloy, is keeping under the prerequisite of hardness (intensity), and the anti-stress corrosion performance of alloy obtains and increases substantially.But, because this invention technical scheme is on the basis of a regression and re-ageing processing, carrying out the regression and re-ageing of one or many repetition processes again, although can obtain comparatively desirable over-all properties, but its aging time is really along with the multiplicity of regression and re-ageing forms multiple increase, greatly increased the difficulty that industrialized condition realizes, production efficiency also significantly reduces.
Summary of the invention
Existing single-stage peak timeliness (T6) for 7000 line aluminium alloys, twin-stage overaging (T7x), defect and the deficiency of three grades of regression and re-ageings (RRA) heat treatment technics, the object of the present invention is to provide the multistage aging treatment process of a kind of 7xxx of improvement line aluminium alloy microtexture and over-all properties, the present invention regulates and controls by the coupling of multistage aging treatment process, particularly cold zone preageing and high-temperature zone timeliness parameter match, high-temperature zone adopts staged ageing treatment of high temperature after first low temperature etc. to process diverse technique means with existing RRA, can realize the Optimum Matching of matrix precipitate and Grain Boundary Precipitates.
For achieving the above object, the present invention takes following technical scheme:
The multistage aging treatment process of improving 7xxx line aluminium alloy microtexture and over-all properties of the present invention, described method mainly comprises following processing step:
(1) cold zone preageing: the blank of 7000 line aluminium alloys or goods are carried out to cold zone preageing, the blank of 7000 line aluminium alloys or goods are warming up to T1 by room temperature, at T1 temperature, soaking time is t1, related parameter area: 95 ℃≤T1≤120 ℃, and 5h≤t1≤18h;
(2) high-temperature zone timeliness: this high-temperature zone timeliness comprises split ag(e)ing insulating process, first the blank of 7000 line aluminium alloys or goods are warming up to T2, at T2 temperature, be incubated t2, continuous warming is to T3 subsequently, at 3 times insulation t3 of temperature T, related parameter area: 165 ℃≤T2, T3≤200 ℃, and T2+15 ℃≤T3; 0.1h≤t2, t3≤3h;
(3) cold zone timeliness again: the blank of 7000 line aluminium alloys or goods are cooled to room temperature by T3, again the blank of 7000 line aluminium alloys or goods are warming up to T4 by room temperature, at T4 temperature, soaking time is t4, related parameter area: 120 ℃≤T4≤140 ℃, and 8h≤t4≤24h; Wherein: T1+10 ℃≤T4;
The blank of (4) 7000 line aluminium alloys or goods again after timeliness, are cooled to room temperature through cold zone preageing, high-temperature zone timeliness and cold zone.
The inventor utilizes nanoscale precipitated phase back dissolving, growth dynamics research means, by large quantity research, find, in subordinate phase high-temperature aging district, adopt twin-stage ladder ageing treatment, before carrying out real " recurrence " processing, increasing by one section " returning in advance " processes, adopt first and third grade of timeliness parameter matching with it, having obtained can efficient coordinated regulation alloy intracrystalline and Grain Boundary Precipitates feature, be applicable to three grades of ageing treatment technology of wider size range goods simultaneously.Adopt this technical scheme can obtain more superior over-all properties coupling,, compare with the technical scheme of traditional RRA, T77 and other Patents bibliographical informations meanwhile, the concrete short flow process of the present invention, be easy to the prominent feature such as industrialization operation.
In the multistage aging treatment process of improving 7xxx line aluminium alloy microtexture and over-all properties of the present invention, wherein main alloying element Zn, the Mg of first stage cold zone preageing parameter and 7xxx line aluminium alloy, the relation of Cu content meet: 105 ℃-(Zn/Mg)-Cu≤T1≤105 ℃+(Zn/Mg)+Cu, wherein, Zn, Mg, Cu content are by weight percentage, Zn in formula, Mg and Cu are respectively percentages, and the unit of (Zn/Mg) ± Cu numerical value is ℃.
In the multistage aging treatment process of improving 7xxx line aluminium alloy microtexture and over-all properties of the present invention, bridging mode between wherein said step (1) and step (2) is: the blank of 7000 line aluminium alloys or goods are directly warming up to T2 temperature by T1 temperature, or be cooled to room temperature by T1 temperature, after the placement some time, by room temperature, be heated to T2 temperature.
In the multistage aging treatment process of improving 7xxx line aluminium alloy microtexture and over-all properties of the present invention, the type of cooling after cold zone preageing in step (1) is any in air cooling, water-cooled, air blast cooling, or its array mode, the blank of 7000 line aluminium alloys or goods are cooled to room temperature.
In the multistage aging treatment process of improving 7xxx line aluminium alloy microtexture and over-all properties of the present invention, the mode of described intensification is one or both array modes that adopt in convection current Hybrid Heating mode and ir radiation mode, and wrought aluminium alloy blank or goods are rapidly heated to T2 temperature spot by room temperature or T1 temperature spot.
In the multistage aging treatment process of improving 7xxx line aluminium alloy microtexture and over-all properties of the present invention, the mode of its intensification is the array mode of ir radiation mode and convection current Hybrid Heating mode, its rate of heating V
heating>=20 ℃/min.
In the multistage aging treatment process of improving 7xxx line aluminium alloy microtexture and over-all properties of the present invention, convection current Hybrid Heating mode is to adopt one or more in air furnace, salt bath furnace, induction furnace to heat.
In the multistage aging treatment process of improving 7xxx line aluminium alloy microtexture and over-all properties of the present invention, after wherein said step (2) completes, in described step (3), the blank of 7000 line aluminium alloys or goods are cooled to room temperature by T3, this cooling employing heat-eliminating medium immersion, roll any or its array mode in end formula spray, strong wind cooling, the blank of 7xxx line aluminium alloy or goods are cooled to room temperature.
In the multistage aging treatment process of improving 7xxx line aluminium alloy microtexture and over-all properties of the present invention, in described step (3), the blank of 7000 line aluminium alloys or goods are cooled to room temperature by T3, its speed of cooling V
cooling>=50 ℃/min.
In the multistage aging treatment process of improving 7xxx line aluminium alloy microtexture and over-all properties of the present invention, described 7xxx line aluminium alloy contains Al, Zn, Mg, Cu element and is selected from least one element in the trace element of Cr, Zr, Mn, Sc, Er, Co.
In the multistage aging treatment process of improving 7xxx line aluminium alloy microtexture and over-all properties of the present invention, described 7xxx line aluminium alloy is AA7075, AA7050, AA7150, AA7055, AA7449, AA7036, AA7136, AA7010, AA7140, AA7037, AA7081, AA7085, AA7185, AA7285, AA7155, AA7056, AA7095 or the AA7093 of international aluminium association (AA) registration.
In the multistage aging treatment process of improving 7xxx line aluminium alloy microtexture and over-all properties of the present invention, described 7xxx line aluminium alloy is 7A04,7B04,7B09,7B50,7A55,7A85,7B85 or the 7A93 alloy of China YouSe metal and alloy designations registration.
In the multistage aging treatment process of improving 7xxx line aluminium alloy microtexture and over-all properties of the present invention, the cross section minimum thickness of described aluminum alloy blank or goods is 10～360mm, and described alloy product comprises cast article, squeezing prod, calendering product, forging product or machine-tooled component product.
In the multistage aging treatment process of improving 7xxx line aluminium alloy microtexture and over-all properties of the present invention, the mean sizes d≤12nm of the 7xxx line aluminium alloy intracrystalline aging precipitation precipitated phase after the method is processed, the space D >=25nm of grain boundary precipitate precipitated phase.
In the multistage aging treatment process of improving 7xxx line aluminium alloy microtexture and over-all properties of the present invention, the 7xxx line aluminium alloy conductivity gamma >=21.5Ms/m after the method is processed.
Compared with prior art, the invention has the advantages that: this treatment process can obviously be improved heterogeneous microstructure and the over-all properties of 7xxx line aluminium alloy, mean sizes d≤the 12nm of alloy intracrystalline Age-prrcipitation Phase, space D >=the 25nm of Grain Boundary Precipitates, more than the specific conductivity of alloy reaches γ >=21.5Ms/m, obtain more superior over-all properties coupling.Another outstanding advantages of the method is, compare with the technical scheme of traditional RRA, T77 and other Patents bibliographical informations, under the prerequisite not reducing in alloy over-all properties level, there is the technology characteristics of easy handling and short flow process, be conducive to enhance productivity.
Accompanying drawing explanation
Fig. 1 is process flow diagram of the present invention.
The 7xxx line aluminium alloy typical case Microstructure characteristics that Fig. 2 obtains for a certain certain aspects adopting in the scope of the invention.
Embodiment
Process flow diagram of the present invention as shown in Figure 1, carries out cold zone preageing to the blank of 7000 line aluminium alloys or goods; Again the blank of 7000 line aluminium alloys or goods are carried out to high-temperature zone timeliness, this high-temperature zone timeliness comprises split ag(e)ing insulating process () and (two); Then by the blank of 7000 line aluminium alloys or goods by being cooled to room temperature, then the blank of 7000 line aluminium alloys or goods are carried out to cold zone timeliness again.The blank of 7000 line aluminium alloys or goods again after timeliness, are cooled to room temperature through cold zone preageing, high-temperature zone timeliness and cold zone.
Technical scheme of the present invention is:
A multistage aging treatment process for 7xxx line aluminium alloy microtexture and over-all properties, described method mainly comprises following processing step as shown in Figure 1, its significant parameter scope: (1) cold zone preageing (T1-temperature; The t1-time): 95 ℃≤T1≤115 ℃, 5h≤t1≤18h; (2) high-temperature zone timeliness comprises split ag(e)ing insulating process, first at T2 temperature, is incubated t2, and continuous warming is incubated t3 to T3 temperature subsequently, related parameter area: 165 ℃≤T2, and T3≤198 ℃, 0.1h≤t2, t3≤3h, T2+15 ℃≤T3; (3) cold zone timeliness (T4-temperature again; The t4-time): 120 ℃≤T4≤140 ℃, 8h≤t4≤24h; Wherein: T1+10 ℃≤T4.
First preferred version of the present invention is: the described multistage aging thermal treatment process that is suitable for 7xxx system's (Al-Zn-Mg-Cu) wrought aluminium alloy blank or goods, wherein the relation of first stage cold zone preageing parameter and main alloying element Zn, Mg, Cu content (by weight percentage) is satisfied: 105 ℃-(Zn/Mg)-Cu≤T1≤105 ℃+(Zn/Mg)+Cu.
Second preferred version of the present invention is: described a kind of multistage aging treatment process of improving 7xxx line aluminium alloy microtexture and over-all properties, bridging mode between wherein said step (1) and step (2) is: by T1 temperature, be directly warming up to T2 temperature, or be cooled to room temperature by T1 temperature, after the placement some time, by room temperature, be heated to T2 temperature.
The 3rd preferred version of the present invention is: described a kind of multistage aging treatment process of improving 7xxx line aluminium alloy microtexture and over-all properties, the type of cooling after step (1) preageing is used air cooling, water-cooled, air blast cooling and array mode thereof that wrought aluminium alloy blank or goods are cooled to room temperature.
The 4th preferred version of the present invention is: described a kind of multistage aging treatment process of improving 7xxx line aluminium alloy microtexture and over-all properties, wherein said heating mode air furnace, salt bath furnace, induction furnace, Infrared Heating and array mode thereof are rapidly heated wrought aluminium alloy blank or goods to T2 temperature spot by room temperature or T1 temperature spot.
One preferred aspect: described heating means, its type of heating is ir radiation and convection current Hybrid Heating mode, its rate of heating V
heating>=20 ℃/min.
The 5th preferred version of the present invention is: described a kind of multistage aging treatment process of improving 7xxx line aluminium alloy microtexture and over-all properties, adopts immediately heat-eliminating medium immersion after wherein said step (2) completes, rolls end formula spray, strong wind cooling and array mode thereof blank or goods are cooled to room temperature.
One preferred aspect, described method of cooling, its speed of cooling V
cooling>=50 ℃/min.
The 6th preferred version of the present invention is: described a kind of multistage aging treatment process of improving 7xxx line aluminium alloy microtexture and over-all properties, is characterized in that: described 7xxx line aluminium alloy contains at least one element in the trace elements such as Al, Zn, Mg, Cu element and Cr, Zr, Mn, Sc, Er, Co.
The 7th preferred version of the present invention is: described a kind of multistage aging treatment process of improving 7xxx line aluminium alloy microtexture and over-all properties, is characterized in that: described 7xxx line aluminium alloy is AA7075, AA7050, AA7150, AA7055, AA7449, AA7036, AA7136, AA7010, AA7140, AA7037, AA7081, AA7085, AA7185, AA7285, AA7155, AA7056, AA7095, the AA7093 etc. of IAI (AA) registration.
The 8th preferred version of the present invention is: described a kind of multistage aging treatment process of improving 7xxx line aluminium alloy microtexture and over-all properties, is characterized in that: described 7xxx line aluminium alloy is 7A04,7B04,7B09,7B50,7A55,7A85,7B85, the 7A93 alloy of China YouSe metal and alloy designations registration etc.
The 9th preferred version of the present invention is: described a kind of multistage aging treatment process of improving 7xxx line aluminium alloy microtexture and over-all properties, it is characterized in that: the cross section minimum thickness of described aluminum alloy blank or goods is 10～360mm, and described alloy product comprises cast article, squeezing prod, calendering product, forging product or machine-tooled component product.
The of the present invention ten preferred version is: described a kind of multistage aging treatment process of improving 7xxx line aluminium alloy microtexture and over-all properties, it is characterized in that: the mean sizes d≤12nm of the 7xxx line aluminium alloy intracrystalline aging precipitation precipitated phase after the method is processed, the space D >=25nm of grain boundary precipitate precipitated phase.
The 11 preferred version of the present invention is: described a kind of multistage aging treatment process of improving 7xxx line aluminium alloy microtexture and over-all properties, is characterized in that: the 7xxx line aluminium alloy conductivity gamma >=21.5Ms/m after the method is processed.
Embodiment 1
Configuration Al-8.8Zn-2.3Mg-2.1Cu-0.12Zr alloy, through process procedures such as melting, semicontinuous casting, homogenizing annealing, hot extrusion, solution hardening, obtain as-quenched temper (T3 state) squeeze wood that thickness is 25mm, on squeeze wood, cut block sample, for carrying out the ageing treatment test of different schemes, aging technique scheme and as shown in table 1.According to relevant testing standard, the tensile mechanical properties through different ageing treatment samples, specific conductivity, anti-stress corrosion performance, exfoliation Corrosion to be tested, result is as shown in table 2; In table 2, also list different institutions of prescription and processed the rear matrix precipitate mean sizes of alloy and the spacing statistics of Grain Boundary Precipitates.
Table 1
Table 2
Embodiment 2
Configuration Al-6.5Zn-2.3Mg-2.1Cu-0.12Zr alloy, through process procedures such as melting, semicontinuous casting, homogenizing annealing, rolling, solution hardening, preliminary drafts, obtain as-quenched temper (T351 state) sheet material that thickness is 40mm, on sheet material, cut block sample, for carrying out the ageing treatment test of different schemes, aging technique scheme and as shown in table 3.According to relevant testing standard, the tensile mechanical properties through different ageing treatment samples, specific conductivity, anti-stress corrosion performance, exfoliation Corrosion to be tested, result is as shown in table 4.
Table 3
Table 4
Embodiment 3
Configuration Al-8.0Zn-2.1Mg-2.3Cu-0.12Zr alloy, through process procedures such as melting, semicontinuous casting, homogenizing annealing, rolling, solution hardening, preliminary drafts, obtain as-quenched temper (T351 state) sheet material that thickness is 25mm, on sheet material, cut block sample, for carrying out the ageing treatment test of different schemes, aging technique scheme and as shown in table 5.According to relevant testing standard, the tensile mechanical properties through different ageing treatment samples, specific conductivity, anti-stress corrosion performance, exfoliation Corrosion to be tested, result is as shown in table 6.
Table 5
Table 6
Embodiment 4
Configuration Al-9.1Zn-1.9Mg-1.6Cu-0.12Zr alloy, through process procedures such as melting, semicontinuous casting, homogenizing annealing, rolling, solution hardening, preliminary drafts, obtain as-quenched temper (T351 state) sheet material that thickness is 80mm, on sheet material, cut block sample, for carrying out the ageing treatment test of different schemes, aging technique scheme and as shown in table 7.According to relevant testing standard, the tensile mechanical properties through different ageing treatment samples, specific conductivity, anti-stress corrosion performance, exfoliation Corrosion to be tested, result is as shown in table 8.
Table 7
Table 8
Embodiment 5
Configuration Al-7.5Zn-1.5Mg-1.6Cu-0.12Zr alloy, through process procedures such as melting, semicontinuous casting, homogenizing annealing, forging, solution hardening, precompression, obtain as-quenched temper (T352 state) open die forgings that thickness is 150mm some, for carrying out the ageing treatment test of different schemes, aging technique scheme and as shown in table 9.According to relevant testing standard, the tensile mechanical properties through different ageing treatment samples, specific conductivity, anti-stress corrosion performance, exfoliation Corrosion to be tested, result is as shown in table 10.
Table 9
Table 10
Embodiment 6
Configuration Al-6.2Zn-2.8Mg-1.6Cu-0.16Cr-0.31Mn alloy, through process procedures such as melting, semicontinuous casting, homogenizing annealing, rolling, solution hardening, preliminary drafts, obtaining thickness is 40mm as-quenched temper (T351 state) slab, for carrying out the ageing treatment test of different schemes, aging technique scheme and as shown in table 11.According to relevant testing standard, the tensile mechanical properties through different ageing treatment samples, specific conductivity, anti-stress corrosion performance, exfoliation Corrosion to be tested, result is as shown in table 12.
Table 11
Table 12
Claims (24)
1. a multistage aging treatment process of improving 7xxx line aluminium alloy microtexture and over-all properties, described method mainly comprises following processing step:
(1) cold zone preageing: the blank of 7000 line aluminium alloys or goods are carried out to cold zone preageing, the blank of 7000 line aluminium alloys or goods are warming up to T1 by room temperature, at T1 temperature, soaking time is t1, related parameter area: 95 ℃≤T1≤120 ℃, and 5h≤t1≤18h;
(2) high-temperature zone timeliness: this high-temperature zone timeliness comprises split ag(e)ing insulating process, first the blank of 7000 line aluminium alloys or goods are warming up to T2, at T2 temperature, be incubated t2, continuous warming is to T3 subsequently, at 3 times insulation t3 of temperature T, related parameter area: 165 ℃≤T2, T3≤200 ℃, and T2+15 ℃≤T3; 0.1h≤t2, t3≤3h;
(3) cold zone timeliness again: the blank of 7000 line aluminium alloys or goods are cooled to room temperature by T3, again the blank of 7000 line aluminium alloys or goods are warming up to T4 by room temperature, at T4 temperature, soaking time is t4, related parameter area: 120 ℃≤T4≤140 ℃, and 8h≤t4≤24h; Wherein: T1+10 ℃≤T4;
The blank of (4) 7000 line aluminium alloys or goods again after timeliness, are cooled to room temperature through cold zone preageing, high-temperature zone timeliness and cold zone.
2. improve according to claim 1 the multistage aging treatment process of 7xxx line aluminium alloy microtexture and over-all properties, wherein main alloying element Zn, the Mg of first stage cold zone preageing parameter and 7xxx line aluminium alloy, the relation of Cu content meet: 105 ℃-(Zn/Mg)-Cu≤T1≤105 ℃+(Zn/Mg)+Cu, wherein, Zn, Mg, Cu content are by weight percentage, Zn in formula, Mg and Cu are respectively percentages, and the unit of (Zn/Mg) ± Cu numerical value is ℃.
3. according to the multistage aging treatment process of improving 7xxx line aluminium alloy microtexture and over-all properties described in claim 1, bridging mode between wherein said step (1) and step (2) is: the blank of 7000 line aluminium alloys or goods are directly warming up to T2 temperature by T1 temperature, or be cooled to room temperature by T1 temperature, after the placement some time, by room temperature, be heated to T2 temperature.
4. improve according to claim 3 the multistage aging treatment process of 7xxx line aluminium alloy microtexture and over-all properties, the type of cooling after cold zone preageing in step (1) is any in air cooling, water-cooled, air blast cooling, or its array mode, the blank of 7000 line aluminium alloys or goods are cooled to room temperature.
5. improve according to claim 3 the multistage aging treatment process of 7xxx line aluminium alloy microtexture and over-all properties, the mode of described intensification is one or both array modes that adopt in convection current Hybrid Heating mode and ir radiation mode, and wrought aluminium alloy blank or goods are rapidly heated to T2 temperature spot by room temperature or T1 temperature spot.
6. the described multistage aging treatment process of improving 7xxx line aluminium alloy microtexture and over-all properties according to claim 5, the mode of its intensification is the array mode of ir radiation mode and convection current Hybrid Heating mode, its rate of heating V
heating>=20 ℃/min.
7. the multistage aging treatment process of improving 7xxx line aluminium alloy microtexture and over-all properties according to claim 6, convection current Hybrid Heating mode is to adopt one or more in air furnace, salt bath furnace, induction furnace to heat.
8. according to the multistage aging treatment process of improving 7xxx line aluminium alloy microtexture and over-all properties described in claim 1, after wherein said step (2) completes, in described step (3), the blank of 7000 line aluminium alloys or goods are cooled to room temperature by T3, this cooling employing heat-eliminating medium immersion, roll any or its array mode in end formula spray, strong wind cooling, the blank of 7xxx line aluminium alloy or goods are cooled to room temperature.
9. improve according to claim 8 the multistage aging treatment process of 7xxx line aluminium alloy microtexture and over-all properties, in described step (3), the blank of 7000 line aluminium alloys or goods are cooled to room temperature by T3, its speed of cooling V
cooling>=50 ℃/min.
10. according to the multistage aging treatment process of improving 7xxx line aluminium alloy microtexture and over-all properties described in any one in claim 1～9, it is characterized in that: described 7xxx line aluminium alloy contains Al, Zn, Mg, Cu element and is selected from least one element in the trace element of Cr, Zr, Mn, Sc, Er, Co.
The 11. multistage aging treatment processs of improving 7xxx line aluminium alloy microtexture and over-all properties according to claim 10, is characterized in that: described 7xxx line aluminium alloy is AA7075, AA7050, AA7150, AA7055, AA7449, AA7036, AA7136, AA7010, AA7140, AA7037, AA7081, AA7085, AA7185, AA7285, AA7155, AA7056, AA7095 or the AA7093 of international aluminium association registration.
The 12. multistage aging treatment processs of improving 7xxx line aluminium alloy microtexture and over-all properties according to claim 10, is characterized in that: described 7xxx line aluminium alloy is 7A04,7B04,7B09,7B50,7A55,7A85,7B85 or the 7A93 alloy of China YouSe metal and alloy designations registration.
13. according to the multistage aging treatment process of improving 7xxx line aluminium alloy microtexture and over-all properties described in any one in claim 1～9, it is characterized in that: the cross section minimum thickness of described aluminum alloy blank or goods is 10～360mm, and described alloy product comprises cast article, squeezing prod, calendering product, forging product or machine-tooled component product.
The 14. multistage aging treatment processs of improving 7xxx line aluminium alloy microtexture and over-all properties according to claim 10, it is characterized in that: the cross section minimum thickness of described aluminum alloy blank or goods is 10～360mm, and described alloy product comprises cast article, squeezing prod, calendering product, forging product or machine-tooled component product.
The 15. multistage aging treatment processs of improving 7xxx line aluminium alloy microtexture and over-all properties according to claim 11, it is characterized in that: the cross section minimum thickness of described aluminum alloy blank or goods is 10～360mm, and described alloy product comprises cast article, squeezing prod, calendering product, forging product or machine-tooled component product.
The 16. multistage aging treatment processs of improving 7xxx line aluminium alloy microtexture and over-all properties according to claim 12, it is characterized in that: the cross section minimum thickness of described aluminum alloy blank or goods is 10～360mm, and described alloy product comprises cast article, squeezing prod, calendering product, forging product or machine-tooled component product.
17. according to the multistage aging treatment process of improving 7xxx line aluminium alloy microtexture and over-all properties described in any one in claim 1～9, it is characterized in that: the mean sizes d≤12nm of the 7xxx line aluminium alloy intracrystalline aging precipitation precipitated phase after the method is processed, the space D >=25nm of grain boundary precipitate precipitated phase.
The 18. multistage aging treatment processs of improving 7xxx line aluminium alloy microtexture and over-all properties according to claim 10, it is characterized in that: the mean sizes d≤12nm of the 7xxx line aluminium alloy intracrystalline aging precipitation precipitated phase after the method is processed, the space D >=25nm of grain boundary precipitate precipitated phase.
The 19. multistage aging treatment processs of improving 7xxx line aluminium alloy microtexture and over-all properties according to claim 11, it is characterized in that: the mean sizes d≤12nm of the 7xxx line aluminium alloy intracrystalline aging precipitation precipitated phase after the method is processed, the space D >=25nm of grain boundary precipitate precipitated phase.
The 20. multistage aging treatment processs of improving 7xxx line aluminium alloy microtexture and over-all properties according to claim 12, it is characterized in that: the mean sizes d≤12nm of the 7xxx line aluminium alloy intracrystalline aging precipitation precipitated phase after the method is processed, the space D >=25nm of grain boundary precipitate precipitated phase.
21. according to the multistage aging treatment process of improving 7xxx line aluminium alloy microtexture and over-all properties described in any one in claim 1～9, it is characterized in that: the 7xxx line aluminium alloy conductivity gamma >=21.5Ms/m after the method is processed.
The 22. multistage aging treatment processs of improving 7xxx line aluminium alloy microtexture and over-all properties according to claim 10, is characterized in that: the 7xxx line aluminium alloy conductivity gamma >=21.5Ms/m after the method is processed.
The 23. multistage aging treatment processs of improving 7xxx line aluminium alloy microtexture and over-all properties according to claim 11, is characterized in that: the 7xxx line aluminium alloy conductivity gamma >=21.5Ms/m after the method is processed.
The 24. multistage aging treatment processs of improving 7xxx line aluminium alloy microtexture and over-all properties according to claim 12, is characterized in that: it is characterized in that: the 7xxx line aluminium alloy conductivity gamma >=21.5Ms/m after the method is processed.
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