CN102796973A - 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 duraluminum of technical field involved in the present invention, the 7xxx that is particularly registered by international aluminium association and China YouSe metal technical committee for standardization (TCST) is the heat treating method of (Al-Zn-Mg-Cu system) duraluminum; More specifically, the present invention relates to have the multistage aging treatment process of the remarkable intensity and the 7xxx line aluminium alloy of other over-all properties couplings.
Background technology
7xxx system (Al-Zn-Mg-Cu system) duraluminum is typical heat-treatable strengthened aluminum alloy, and the aging technique process is to make its acquisition HS and other over-all propertieies mate one of the most key process procedure.For this reason, since the fifties in last century, first practicability 7xxx duraluminum was born, material supplier author was devoted to develop the timeliness novel process that can improve structure property always.Before the sixties in last century, the normal institution of prescription that adopts of Al-Zn-Mg-Cu line aluminium alloy is peak value timeliness (T6), and purpose is to obtain maximum intensity.But the main strengthening phase of this state is GP district and a spot of η ', and crystal boundary is a chain successive precipitate, and this anti-stress corrosion performance to alloy is very unfavorable, the corrosion passage is provided very easily for the development of stress corrosion cracking, makes stress corrosion cracking be easier to expansion.Be head it off, material supplier author has developed T7x (T73, T74, T76, T79) twin-stage overaging system, and wherein, first step timeliness is the low temperature preageing, is nucleation stage; Second stage timeliness is a high-temperature aging, is the stabilization stage.The low temperature preageing has intense influence to size, distribution and the density of the precipitated phase of high-temperature aging generation subsequently, helps the formation of η ' phase.Twin-stage overaging system makes the η ' phase and η particle gathering mutually on the crystal boundary, has destroyed the continuity of crystal boundary precipitated phase, and tissue is improved, and has reduced stress corrosion and has peeled off corrosion susceptibility, has also improved the fracture toughness property of alloy.Meanwhile, because intragranular strengthening phase particle generation alligatoring, when improving the stress corrosion resistant ability, be cost but therefore to sacrifice 10～15% intensity.These two-stage time effect systems have been widely used in the thermal treatment of members such as airframe framework, Chuan Bi, wing cover, stiffening web, gear support component, rivet, but they have all lost certain static strength performance inevitably.
For solving intensity that this is an alloy and this problem of contradiction between the 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), and making and returning phenomenon is that breakthrough application has been arranged in the alloy at Al-Zn-Mg-Cu.RRA handles and comprises three grades: the first step is carried out T6 peak value preageing at a lower temperature, and microstructure is identical with peak value timeliness state with performance; The second stage (200 ℃～260 ℃) under comparatively high temps is carried out isothermal treatment for short time (tens seconds to several minutes) back and is quenched; After regression treatment; The coherence of intracrystalline or half coherence precipitated phase dissolve again in the sosoloid, on the crystal boundary continuously the chain precipitated phase merge, gather, 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 ' mutually, and disperse distributes, and crystal boundary still is discontinuous non-coherence precipitated phase.After RRA handled, intracrystalline was similar with organizing of T6 attitude, and crystal boundary is similar with the T7 state, made the unification of alloy acquisition HS and good anti-stress corrosion performance.But unfortunately; Because being processed part, the RRA arts demand at high temperature exposes in short-term; Thereby can only be applied to less structural part; But cause the even more serious slab of stress corrosion and heavy section casting powerless for Working environment, this also becomes the RRA system and in industriallization, obtains the major obstacle used.
On the RRA processing basis, material supplier author constantly carries out deep research and improvement to RRA technology, mainly is how to widen second stage aging time under the prerequisite significantly not reducing of assurance alloy over-all properties, to satisfy the needs of thick cross section production of articles as far as possible.But the RRA processing specification that the Aloca company of the U.S. in 1989 runs after fame and registered first industrial application with the T77 as-heat-treated condition; And this technology is used for the processing of 7150 sheet materials and extrusion, make it the anti-stress corrosion performance that has not only kept the intensity of T6 state but also reached the T76 state.From existing bibliographical information; T77 handles the system patent and stresses that first step timeliness will be with alloy treatment to nearly peak strength state; Although they, make that the time window of second stage regression treatment is obviously widened through reducing the regressive temperature in the second stage (length can reach several hours), can realize the regression treatment of thick cross section goods; But this moment, timeliness parameter matching at different levels were unreasonable, and the over-all properties of alloy product is difficult to reach the initial RRA treatment effect that proposes of Cina.Systematic study through to microtexture in above-mentioned three grades of institution of prescription processes and over-all properties is found, because the first step has adopted T6 peak ageing treatment, distributes though alloy crystal boundary precipitated phase has been grown up to certain size and has been to a certain extent to break off; But meanwhile; The intracrystalline precipitated phase is also obviously grown up, and when comparing the lower second stage temperature regression treatment of traditional RRA system, can Hui Rong obviously reduces to basic intravital precipitated phase quantity; Can't realize the flesh and blood of " recurrence "; Cause the third stage again timeliness separate out potentiality and reduce greatly, final, the over-all properties of alloy and real RRA treatment effect are far apart.For overcoming this shortcoming; People such as Central South University Chen Kang China applied for a patent of invention CN101792891B of the People's Republic of China in 2010, had stated the aging treatment process of a kind of Al-Zn-Mg-Cu of improvement line aluminium alloy intensity and corrosion resistance, and its invention technical scheme is: aging temp is 120 ℃ of insulation 24h; Returning temperature is 170～200 ℃ of insulation 5-30min; Recurrence finishes, and carries out quench treatment or cools to aging temp again with the furnace, and aging temp is 120 ℃ of insulation 24h again; Behind a regression and re-ageing, carry out the one or many regression and re-ageing again and handle.What this technical scheme can make the Al-Zn-Mg-Cu line aluminium alloy is organized in the enterprising one-step optimization of regression and re-ageing processing basis one time, and under the prerequisite that keeps hardness (intensity), the anti-stress corrosion performance of alloy obtains to increase substantially.But; Because this invention technical scheme is on regression and re-ageing processing basis; Carry out one or many multiple regression and re-ageing again and handle, although can obtain comparatively ideal over-all properties, its aging time is really along with the multiplicity of regression and re-ageing forms the multiple increase; Increased the difficulty that industrialized condition realizes greatly, production efficiency also significantly reduces.
Summary of the invention
Defective and deficiency to the existing single-stage peak timeliness (T6) of 7000 line aluminium alloys, twin-stage overaging (T7x), 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 is through the coupling regulation and control of multistage aging treatment process; Particularly cold zone preageing and high-temperature zone timeliness parameter are complementary, the high-temperature zone adopts behind the first low temperature pyritous staged ageing treatment etc. to handle complete different techniques means with existing RRA, can realize the Optimum Matching of intracrystalline precipitated phase and crystal boundary precipitated phase.
For realizing above-mentioned purpose, 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, said method mainly comprises following process step:
(1) cold zone preageing: blank or goods to 7000 line aluminium alloys carry out the cold zone preageing; The blank or the goods of 7000 line aluminium alloys are warming up to T1 by room temperature; Soaking time is t1 under the T1 temperature, related parameter area: 95 ℃≤T1≤120 ℃, and 5h≤t1≤18h;
(2) high-temperature zone timeliness: this high-temperature zone timeliness comprises the split ag(e)ing insulating process; Promptly elder generation is warming up to T2 with the blank or the goods of 7000 line aluminium alloys, under the T2 temperature, is incubated t2, is warming up to T3 subsequently continuously; At 3 times insulations of temperature T t3; Related parameter area: 165 ℃≤T2, T3≤200 ℃, and T2+15 ℃≤T3; 0.1h≤t2, t3≤3h;
(3) cold zone timeliness again: the blank or the goods of 7000 line aluminium alloys are cooled to room temperature by T3; Blank or goods with 7000 line aluminium alloys are warming up to T4 by room temperature again; Soaking time is t4 under the T4 temperature, 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 the timeliness, are cooled to room temperature through cold zone preageing, high-temperature zone timeliness and cold zone.
The inventor utilizes nanoscale precipitated phase Hui Rong, growth dynamics research means; Through discovering in a large number; Adopt twin-stage ladder ageing treatment in subordinate phase high-temperature aging district; Promptly increase by one section " returning in advance " before handling and handle carrying out real " recurrences ", adopt the first and third grade of timeliness parameter that is complementary with it simultaneously, obtained efficiently coordinated regulation alloy intracrystalline and crystal boundary precipitated phase characteristic, be applicable to three grades of ageing treatment technology of broad size range goods.Adopt this technical scheme can obtain more superior over-all properties coupling, simultaneously, compare, the specifically short flow process of the present invention, be easy to prominent feature such as industriallization operation with the technical scheme of traditional RRA, T77 and other related patent U.S. Patent No. bibliographical informations.
In the multistage aging treatment process of improving 7xxx line aluminium alloy microtexture and over-all properties of the present invention; Wherein the relation of the main alloying element Zn of fs cold zone preageing parameter and 7xxx line aluminium alloy, Mg, Cu content satisfies: 105 ℃-(Zn/Mg)-Cu≤T1≤105 ℃+(Zn/Mg)+Cu; Wherein, Zn, Mg, Cu content are by weight percentage, and the Zn in the formula, Mg and Cu are respectively percentages, (Zn/Mg) ± and the unit of 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 the step (2) is: the blank or the goods of 7000 line aluminium alloys directly are warming up to the T2 temperature by the T1 temperature; Or be cooled to room temperature by the T1 temperature, place after the some time by the room temperature heat temperature raising to the 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 behind the cold zone preageing in the step (1) is any in air cooling, water-cooled, the air blast cooling; Or its array mode, the blank or the goods of 7000 line aluminium alloys 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 said intensification is one or both array modes that adopt in convection current Hybrid Heating mode and the ir radiation mode, and wrought aluminium alloy blank or goods are rapidly heated to the 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 in air furnace, salt bath furnace, the induction furnace one or more 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) is accomplished; In described step (3); The blank or the goods of 7000 line aluminium alloys are cooled to room temperature by T3, and this cooling adopts heat-eliminating medium immersion, roll any or its array mode in end formula spray, the high wind cooling, and the blank or the goods of 7xxx line aluminium alloy 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 or the goods of 7000 line aluminium alloys 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, said 7xxx line aluminium alloy contains Al, Zn, Mg, Cu element and is selected from least a 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, said 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, said 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 xsect minimum thickness of said aluminum alloy blank or goods is 10～360mm, and said alloy product comprises cast article, squeezing prod, calendering product, forging product or machining member 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 this method is handled, 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 this method is handled.
Compared with prior art; The invention has the advantages that: this treatment process can obviously be improved the heterogeneous microstructure and the over-all properties of 7xxx line aluminium alloy; Mean sizes d≤the 12nm of alloy intracrystalline timeliness precipitated phase; Space D>=the 25nm of crystal boundary precipitated phase, the specific conductivity of alloy reaches more than γ>=21.5Ms/m, obtains more superior over-all properties coupling.The outstanding advantage of another of this method is; Compare with the technical scheme of traditional RRA, T77 and other related patent U.S. Patent No. bibliographical informations; Under the prerequisite that alloy over-all properties level does not reduce, have the technology characteristics of easy handling and short flow process, help enhancing productivity.
Description of drawings
Fig. 1 is a process flow diagram of the present invention.
Fig. 2 is for adopting the 7xxx line aluminium alloy that a certain certain aspects the obtained typical case Microstructure characteristics in the scope of the invention.
Embodiment
Process flow diagram of the present invention is as shown in Figure 1, and the blank or the goods of 7000 line aluminium alloys are carried out the cold zone preageing; Blank or goods to 7000 line aluminium alloys carry out the high-temperature zone timeliness again, and this high-temperature zone timeliness comprises split ag(e)ing insulating process () and (two); Then with the blank of 7000 line aluminium alloys or goods by being cooled to room temperature, blank or the goods to 7000 line aluminium alloys carry out cold zone timeliness more again.The blank of 7000 line aluminium alloys or goods again after the 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 kind of multistage aging treatment process of improving 7xxx line aluminium alloy microtexture and over-all properties, it is as shown in Figure 1 that said method mainly comprises following process step, its significant parameter scope: (1) cold zone preageing (T1-temperature; The t1-time): 95 ℃≤T1≤115 ℃, 5h≤t1≤18h; (2) the high-temperature zone timeliness comprises the split ag(e)ing insulating process, promptly earlier under the T2 temperature, is incubated t2, is warming up to T3 temperature insulation t3 subsequently continuously, 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 (Al-Zn-Mg-Cu) wrought aluminium alloy blank or goods, and wherein the relation of fs 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: said 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 the step (2) is: directly be warming up to the T2 temperature by the T1 temperature; Or be cooled to room temperature by the T1 temperature, place after the some time by the room temperature heat temperature raising to the T2 temperature.
The 3rd preferred version of the present invention is: said a kind of multistage aging treatment process of improving 7xxx line aluminium alloy microtexture and over-all properties, the type of cooling behind step (1) preageing use 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: said 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 the T2 temperature spot by room temperature or T1 temperature spot.
One preferred aspect: said heating means, its type of heating are 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: adopt the heat-eliminating medium immersion immediately after said a kind of multistage aging treatment process of improving 7xxx line aluminium alloy microtexture and over-all properties, wherein said step (2) are accomplished, roll end formula spray, high wind cooling and array mode thereof blank or goods are cooled to room temperature.
One preferred aspect, said 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, it is characterized in that: said 7xxx line aluminium alloy contains at least a 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: said 7xxx line aluminium alloy is the AA7075, AA7050, AA7150, AA7055, AA7449, AA7036, AA7136, AA7010, AA7140, AA7037, AA7081, AA7085, AA7185, AA7285, AA7155, AA7056, AA7095, AA7093 of IAI (AA) registration etc.
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: said 7xxx line aluminium alloy is the 7A04,7B04,7B09,7B50,7A55,7A85,7B85,7A93 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 xsect minimum thickness of said aluminum alloy blank or goods is 10～360mm, and said alloy product comprises cast article, squeezing prod, calendering product, forging product or machining member 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 this method is handled, 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 this method is handled.
Embodiment 1
Configuration Al-8.8Zn-2.3Mg-2.1Cu-0.12Zr alloy; Obtaining thickness through process procedures such as melting, semicontinuous casting, homogenizing annealing, hot extrusion, solution hardening is solution hardening attitude (T3 attitude) squeeze wood of 25mm; On squeeze wood, cut block sample; Be used to carry out the ageing treatment test of different schemes, aging technique scheme and as shown in table 1.According to relevant testing standard, tensile mechanical properties, specific conductivity, anti-stress corrosion performance, exfoliation Corrosion through different ageing treatment samples are tested, the result is as shown in table 2; Also list different institutions of prescription in the table 2 and handled the intracrystalline precipitated phase mean sizes of back alloy and the spacing statistics of crystal boundary precipitated phase.
Table 1
Table 2
Embodiment 2
Configuration Al-6.5Zn-2.3Mg-2.1Cu-0.12Zr alloy; Obtaining thickness through process procedures such as melting, semicontinuous casting, homogenizing annealing, rolling, solution hardening, preliminary drafts is solution hardening attitude (T351 attitude) sheet material of 40mm; On sheet material, cut block sample; Be used to carry out the ageing treatment test of different schemes, aging technique scheme and as shown in table 3.According to relevant testing standard, tensile mechanical properties, specific conductivity, anti-stress corrosion performance, exfoliation Corrosion through different ageing treatment samples are tested, the result is as shown in table 4.
Table 3
Table 4
Embodiment 3
Configuration Al-8.0Zn-2.1Mg-2.3Cu-0.12Zr alloy; Obtaining thickness through process procedures such as melting, semicontinuous casting, homogenizing annealing, rolling, solution hardening, preliminary drafts is solution hardening attitude (T351 attitude) sheet material of 25mm; On sheet material, cut block sample; Be used to carry out the ageing treatment test of different schemes, aging technique scheme and as shown in table 5.According to relevant testing standard, tensile mechanical properties, specific conductivity, anti-stress corrosion performance, exfoliation Corrosion through different ageing treatment samples are tested, the result is as shown in table 6.
Table 5
Table 6
Embodiment 4
Configuration Al-9.1Zn-1.9Mg-1.6Cu-0.12Zr alloy; Obtaining thickness through process procedures such as melting, semicontinuous casting, homogenizing annealing, rolling, solution hardening, preliminary drafts is solution hardening attitude (T351 attitude) sheet material of 80mm; On sheet material, cut block sample; Be used to carry out the ageing treatment test of different schemes, aging technique scheme and as shown in table 7.According to relevant testing standard, tensile mechanical properties, specific conductivity, anti-stress corrosion performance, exfoliation Corrosion through different ageing treatment samples are tested, the result is as shown in table 8.
Table 7
Table 8
Embodiment 5
Configuration Al-7.5Zn-1.5Mg-1.6Cu-0.12Zr alloy; Obtaining thickness through process procedures such as melting, semicontinuous casting, homogenizing annealing, forging, solution hardening, precompression is that solution hardening attitude (T352 attitude) open die forgings of 150mm is some; Be used to carry out the ageing treatment test of different schemes, aging technique scheme and as shown in table 9.According to relevant testing standard, tensile mechanical properties, specific conductivity, anti-stress corrosion performance, exfoliation Corrosion through different ageing treatment samples are tested, the 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; Obtaining thickness through process procedures such as melting, semicontinuous casting, homogenizing annealing, rolling, solution hardening, preliminary drafts is 40mm solution hardening attitude (T351 attitude) slab; Be used to carry out the ageing treatment test of different schemes, aging technique scheme and as shown in table 11.According to relevant testing standard, tensile mechanical properties, specific conductivity, anti-stress corrosion performance, exfoliation Corrosion through different ageing treatment samples are tested, the result is as shown in table 12.
Table 11
Table 12
Claims (15)
1. multistage aging treatment process of improving 7xxx line aluminium alloy microtexture and over-all properties, said method mainly comprises following process step:
(1) cold zone preageing: blank or goods to 7000 line aluminium alloys carry out the cold zone preageing; The blank or the goods of 7000 line aluminium alloys are warming up to T1 by room temperature; Soaking time is t1 under the T1 temperature, related parameter area: 95 ℃≤T1≤120 ℃, and 5h≤t1≤18h;
(2) high-temperature zone timeliness: this high-temperature zone timeliness comprises the split ag(e)ing insulating process; Promptly elder generation is warming up to T2 with the blank or the goods of 7000 line aluminium alloys, under the T2 temperature, is incubated t2, is warming up to T3 subsequently continuously; At 3 times insulations of temperature T t3; Related parameter area: 165 ℃≤T2, T3≤200 ℃, and T2+15 ℃≤T3; 0.1h≤t2, t3≤3h;
(3) cold zone timeliness again: the blank or the goods of 7000 line aluminium alloys are cooled to room temperature by T3; Blank or goods with 7000 line aluminium alloys are warming up to T4 by room temperature again; Soaking time is t4 under the T4 temperature, 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 the timeliness, are cooled to room temperature through cold zone preageing, high-temperature zone timeliness and cold zone.
2. according to the said multistage aging treatment process of improving 7xxx line aluminium alloy microtexture and over-all properties of claim 1; Wherein the relation of the main alloying element Zn of fs cold zone preageing parameter and 7xxx line aluminium alloy, Mg, Cu content satisfies: 105 ℃-(Zn/Mg)-Cu≤T1≤105 ℃+(Zn/Mg)+Cu; Wherein, Zn, Mg, Cu content are by weight percentage, and the Zn in the formula, Mg and Cu are respectively percentages, (Zn/Mg) ± and the unit of 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 the claim 1; Bridging mode between wherein said step (1) and the step (2) is: the blank or the goods of 7000 line aluminium alloys directly are warming up to the T2 temperature by the T1 temperature; Or be cooled to room temperature by the T1 temperature, place after the some time by the room temperature heat temperature raising to the T2 temperature.
4. according to the said multistage aging treatment process of improving 7xxx line aluminium alloy microtexture and over-all properties of claim 3; The type of cooling behind the cold zone preageing in the step (1) is any in air cooling, water-cooled, the air blast cooling; Or its array mode, the blank or the goods of 7000 line aluminium alloys are cooled to room temperature.
5. according to the said multistage aging treatment process of improving 7xxx line aluminium alloy microtexture and over-all properties of claim 3; The mode of said intensification is one or both array modes that adopt in convection current Hybrid Heating mode and the ir radiation mode, and wrought aluminium alloy blank or goods are rapidly heated to the T2 temperature spot by room temperature or T1 temperature spot.
6. according to the said multistage aging treatment process of improving 7xxx line aluminium alloy microtexture and over-all properties of 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 are to adopt in air furnace, salt bath furnace, the induction furnace one or more to heat.
8. according to the multistage aging treatment process of improving 7xxx line aluminium alloy microtexture and over-all properties described in the claim 1; After wherein said step (2) is accomplished; In described step (3); The blank or the goods of 7000 line aluminium alloys are cooled to room temperature by T3, and this cooling adopts heat-eliminating medium immersion, roll any or its array mode in end formula spray, the high wind cooling, and the blank or the goods of 7xxx line aluminium alloy are cooled to room temperature.
9. the said according to Claim 8 multistage aging treatment process of improving 7xxx line aluminium alloy microtexture and over-all properties in described step (3), is cooled to room temperature by T3, its speed of cooling V with the blank or the goods of 7000 line aluminium alloys
Cooling>=50 ℃/min.
10. according to the described multistage aging treatment process of improving 7xxx line aluminium alloy microtexture and over-all properties of claim 1～9, it is characterized in that: said 7xxx line aluminium alloy contains Al, Zn, Mg, Cu element and is selected from least a element in the trace element of Cr, Zr, Mn, Sc, Er, Co.
11. the multistage aging treatment process of improving 7xxx line aluminium alloy microtexture and over-all properties according to claim 10 is characterized in that: said 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.
12. the multistage aging treatment process of improving 7xxx line aluminium alloy microtexture and over-all properties according to claim 10 is characterized in that: said 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 described a kind of multistage aging treatment process of improving 7xxx line aluminium alloy microtexture and over-all properties of claim 1～12; It is characterized in that: the xsect minimum thickness of said aluminum alloy blank or goods is 10～360mm, and said alloy product comprises cast article, squeezing prod, calendering product, forging product or machining member product.
14. according to the described a kind of multistage aging treatment process of improving 7xxx line aluminium alloy microtexture and over-all properties of claim 1～12; It is characterized in that: the mean sizes d≤12nm of the 7xxx line aluminium alloy intracrystalline aging precipitation precipitated phase after this method is handled, the space D>=25nm of grain boundary precipitate precipitated phase.
15., it is characterized in that: the 7xxx line aluminium alloy conductivity gamma >=21.5Ms/m after this method is handled according to the described a kind of multistage aging treatment process of improving 7xxx line aluminium alloy microtexture and over-all properties of claim 1～12.
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