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WO2014142199A1 - Plaque en alliage d'aluminium destinée à un matériau de structure - Google Patents

Plaque en alliage d'aluminium destinée à un matériau de structure Download PDF

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Publication number
WO2014142199A1
WO2014142199A1 PCT/JP2014/056567 JP2014056567W WO2014142199A1 WO 2014142199 A1 WO2014142199 A1 WO 2014142199A1 JP 2014056567 W JP2014056567 W JP 2014056567W WO 2014142199 A1 WO2014142199 A1 WO 2014142199A1
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Prior art keywords
aluminum alloy
alloy plate
content
strength
treatment
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Ceased
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PCT/JP2014/056567
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English (en)
Japanese (ja)
Inventor
松本　克史
有賀　康博
久郎 宍戸
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Kobe Steel Ltd
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Kobe Steel Ltd
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Priority to US14/767,096 priority Critical patent/US20150376742A1/en
Priority to CN201480011852.9A priority patent/CN105143484A/zh
Publication of WO2014142199A1 publication Critical patent/WO2014142199A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C21/00—Alloys based on aluminium
    • C22C21/10—Alloys based on aluminium with zinc as the next major constituent
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C21/00—Alloys based on aluminium
    • C22C21/06—Alloys based on aluminium with magnesium as the next major constituent
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C21/00—Alloys based on aluminium
    • C22C21/06—Alloys based on aluminium with magnesium as the next major constituent
    • C22C21/08—Alloys based on aluminium with magnesium as the next major constituent with silicon
    • 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
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/002—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working by rapid cooling or quenching; cooling agents used therefor
    • 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
    • C22F1/047—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 magnesium as the next major constituent
    • 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

Definitions

  • the present invention relates to a high-strength aluminum alloy plate for a structural material that has improved workability and excellent corrosion resistance.
  • the aluminum alloy plate of the present invention is a rolled plate, which is a plate obtained by subjecting a plate produced by rolling to aging at room temperature for 2 weeks or more after solution treatment and quenching treatment, before forming into a structural material and artificial This refers to the plate before age hardening.
  • the composition and tempering (solution treatment and quenching) of the JIS to AA6000 series aluminum alloy plates which are used in the above-mentioned automobile panels, are excellent in formability, strength, corrosion resistance, low alloy composition and recyclability. Control of the treatment, and further, the artificial age hardening treatment, is far from achieving the high strength.
  • the 7000 series aluminum alloy which is an Al—Zn—Mg series aluminum alloy
  • SCC stress corrosion cracking
  • composition control for example, in Patent Document 1, Mg added in excess of Zn and Mg content (stoichiometry ratio of MgZn 2 ) of a 7000 series aluminum alloy extruded material that forms MgZn 2 without excess or deficiency. but by utilizing the fact that contributes to high strength by adding Mg to excess over stoichiometric ratio of MgZn 2, to suppress the MgZn 2 amount, without reducing the SCC resistance, and high strength Yes.
  • Patent Document 2 As a typical example of the structure control of precipitates and the like, for example, in Patent Document 2, a 7000 series aluminum alloy extruded material after artificial age-hardening treatment is used for a precipitate having a particle diameter of 1 to 15 nm in crystal grains. As a result of observation by (TEM), it is made to exist at a density of 1000 to 10000 / ⁇ m 2 to reduce the potential difference between the grains and the grain boundaries, thereby improving the SCC resistance.
  • TEM TEM
  • composition control to improve both the strength and SCC resistance of a 7000 series aluminum alloy extruded material and examples of structure control such as precipitates are many practical applications in extruded materials. There are many in proportion to On the other hand, there are very few examples of conventional structure control such as composition control and precipitates in a 7000 series aluminum alloy plate according to the small practical use of the plate.
  • Patent Document 3 in a structural material made of a clad plate in which 7000 series aluminum alloy plates are welded together, the diameter of an aging precipitate after artificial age hardening treatment is 50 mm (angstrom) or less in order to improve strength. It has been proposed that a certain amount exists as a spherical shape. However, there is no disclosure about the SCC resistance performance, and there is no corrosion resistance data in the examples.
  • Patent Document 4 the molten metal is cold-rolled after rapid solidification, and the crystal precipitates in the crystal grains of the 7000 series aluminum alloy plate after artificial age hardening treatment are measured by a 400 times optical microscope.
  • Strength equivalent to equivalent circle diameter with equivalent area
  • average area fraction is set to 4.5% or less, and strength and elongation are improved.
  • Patent Documents 5 and 6 in order to increase the strength and SCC resistance of a 7000 series plate for a structural material, the ingot is forged and rolled repeatedly in a warm working region after being forged. Is fine. This is because, by making the structure finer, a large tilt grain boundary having an orientation difference of 20 ° or more, which causes a potential difference between the grain boundary and the grain boundary, which causes a decrease in SCC resistance, is suppressed. This is to obtain a texture having a small angle grain boundary of 25 ° or more.
  • such warm rolling is repeated because the conventional hot rolling and cold rolling methods cannot obtain a texture in which such a low-angle grain boundary is 25% or more. ing. Therefore, since the process is greatly different from the conventional method, it is difficult to say that it is a practical method for producing a plate.
  • the extruded material is completely different from the rolled plate in its manufacturing process such as a hot working process, and the resulting structure of crystal grains and precipitates is, for example, a fibrous form in which the crystal grains are elongated in the extrusion direction.
  • the crystal grains are basically different from a rolled plate having equiaxed grains.
  • the object of the present invention is to provide a 7000 series aluminum for structural members such as automobile members, which has both strength and formability and is excellent in corrosion resistance as a rolled plate produced by the conventional method. It is to provide an alloy plate.
  • the gist of the aluminum alloy sheet for structural material of the present invention is, in mass%, Zn: 3.0 to 6.0%, Mg: 1.5 to 4.5%, Cu: 0.00.
  • the Zn content [Zn] and the Mg content [Mg] satisfy the relationship [Zn] ⁇ ⁇ 0.3 [Mg] +4.5, and the balance Is the maximum endothermic peak temperature in the differential scanning calorimetry curve when Al—Zn—Mg-based aluminum alloy plate having a composition consisting of Al and inevitable impurities is subjected to solution aging and quenching at room temperature.
  • the maximum exothermic peak height in the temperature range of 200 to 300 ° C. is 50 ⁇ W / mg or more, and the work hardening index n value (10 to 20%) is 0.22 or more. To do.
  • the aluminum alloy plate referred to in the present invention is a plate produced by rolling, and the ingot is hot-rolled after soaking, further cold-rolled into a cold-rolled plate, and further subjected to solution treatment and quenching treatment, etc.
  • the aluminum alloy plate referred to in the present invention defines a room temperature aged structure of the 7000 series aluminum alloy plate produced as described above, and is processed into a structural material for use as a material aluminum alloy plate. It is. For this reason, it refers to a plate after the plate manufactured as described above is aged at room temperature (room temperature standing), and before being formed into a structural material as an application and before artificial age hardening treatment.
  • the present invention analyzed the room temperature aged structure of a 7000 series aluminum alloy plate having a composition in which the Mg content was increased in order to ensure strength while suppressing the Zn content in order to improve corrosion resistance, using a differential scanning calorimetry curve. .
  • the composition and action of the cluster formed by aging at room temperature are different in the 7000 series aluminum alloy plate having such a composition as compared with the 7000 series aluminum alloy sheet having a high Zn content.
  • the clusters (atomic aggregates) generated by aging at room temperature are not only the artificial age-hardening properties (BH properties) after forming into the structural material that is used. They have also found that it contributes to the ductility (work hardening characteristics) required during the forming of structural materials. Therefore, by controlling these clusters, it is possible to improve not only the corrosion resistance but also the balance between strength and ductility (formability), and as a rolled plate manufactured by a conventional method, it has both strength and formability.
  • a structural 7000 series aluminum alloy plate excellent in corrosion resistance such as SCC resistance can be provided.
  • composition, size, or density of such clusters cannot be directly identified using ordinary observation means such as SEM or TEM at the present time. Difficult to define quantitatively.
  • the room temperature aged structure of the manufactured 7000 series aluminum alloy plate is controlled by indirectly defining the clusters by analysis using a differential scanning calorimetry curve. More specifically, in the analysis based on the differential scanning calorimetry curve, the work hardening characteristics as ductility are improved as the temperature of the endothermic peak corresponding to the re-solution of clusters formed by room temperature aging is lowered. On the other hand, the higher the maximum height of the exothermic peak in the temperature range of 200 to 300 ° C. corresponding to the precipitate after the artificial age hardening treatment, the greater the amount of artificial age precipitate and the higher the strength.
  • the measurement of the differential scanning calorimetry curve is not the state of the plate that has not been aged at room temperature immediately after the tempering treatment, but as a guide for two weeks or more. This is performed on the plate after aging at room temperature (room temperature standing), before forming into a structural material and before artificial age hardening.
  • Aluminum alloy composition First, the chemical component composition of the aluminum alloy sheet of the present invention will be described below, including reasons for limiting each element. In addition,% display of content of each element means the mass% altogether.
  • the chemical composition of the aluminum alloy sheet of the present invention combines strength and formability, which are required characteristics for structural materials such as automobile members intended in the present invention, as a rolled sheet produced by a conventional method. It is a prerequisite for satisfying corrosion resistance.
  • the Al-Zn-Mg-Cu-based 7000 series aluminum alloy composition in the present invention is a composition in which the Mg content is increased in order to secure strength while suppressing the Zn content in order to improve the corrosion resistance. .
  • the chemical composition of the aluminum alloy sheet of the present invention is, in mass%, Zn: 3.0 to 6.0%, Mg: 1.5 to 4.5%, Cu: 0.05 to 0.5. %, And the Zn content [Zn] and the Mg content [Mg] satisfy a relationship of [Zn] ⁇ ⁇ 0.3 [Mg] +4.5, the balance being Al and inevitable It shall consist of impurities.
  • Zr 0.05 to 0.3%
  • Mn 0.1 to 1.5%
  • Cr 0.05 to 0.3%
  • Sc 0.05
  • One type or two or more types of up to 0.3% may be selectively included.
  • Ag 0.01 to 0.2% may be selectively contained.
  • Zn 3.0-6.0% Zn, which is an essential alloying element, together with Mg, forms clusters during aging of the manufactured tempered plate to improve work hardening characteristics and improve the workability of the structural material.
  • an aging precipitate is formed to improve the strength during the artificial aging treatment after the forming process to the structural material. If the Zn content is less than 3.0%, the strength after the artificial aging treatment is insufficient. However, if the Zn content increases and exceeds 6.0%, the grain boundary precipitate MgZn 2 increases and intergranular corrosion tends to occur, and the corrosion resistance deteriorates. Therefore, in the present invention, the Zn content is suppressed to be relatively small. For this reason, the minimum of Zn content is 3.0%, Preferably it is 3.5%. Moreover, the upper limit of Zn content is 6.0%, Preferably it is 4.5%.
  • Mg 1.5-4.5% Mg, which is an indispensable alloy element, together with Zn forms clusters during room temperature aging of the manufactured tempered plate to improve work hardening characteristics.
  • an aging precipitate is formed during the artificial aging treatment after the forming process to the structural material, thereby improving the strength.
  • the Mg content is made relatively large. If the Mg content is less than 1.5% by mass, the strength is insufficient and the work hardening characteristics are deteriorated. However, if it exceeds 4.5 mass%, the rollability of the plate is lowered, and the SCC sensitivity is enhanced. Therefore, the lower limit of the Mg content is 1.5%, preferably 2.5%. Moreover, the upper limit of Mg content is 4.5%.
  • Balance formula of Zn and Mg In the present invention, in order to ensure high strength due to the inclusion of Zn and Mg, not only the content of Zn and Mg but also the Zn content [Zn] (mass%) and the Mg content [ It is important to control the balance with [Mg] (mass%). For this reason, as a control of this balance, [Zn] and [Mg] have a balance formula of [Zn] ⁇ ⁇ 0.3 [Mg] +4.5, preferably [Zn] ⁇ ⁇ 0.5 [Mg]. The balance equation of +5.75 is satisfied.
  • the 0.2% proof stress of the structural material after the artificial age hardening treatment can be set to 350 MPa or more by a preferable manufacturing method described later. It becomes. Further, by satisfying [Zn] ⁇ ⁇ 0.5 [Mg] +5.75, the 0.2% proof stress of the structural material after artificial age hardening treatment is set to 400 MPa or more by a preferable manufacturing method described later. It becomes possible.
  • Cu 0.05 to 0.5%
  • Cu has the effect of suppressing the SCC sensitivity of the Al—Zn—Mg alloy and improving the SCC resistance. It also improves general corrosion resistance.
  • the Cu content is less than 0.05%, the effect of improving SCC resistance and general corrosion resistance is small.
  • the lower limit of the Cu content is 0.05%.
  • the upper limit of the Cu content is 0.5%, preferably 0.4%.
  • Zr 0.05 to 0.3%
  • Mn 0.1 to 1.5%
  • Cr 0.05 to 0.3%
  • Sc 0.05 to 0.3% Since the transition elements of Zr, Mn, Cr, and Sc contribute to improvement in strength by refining the crystal grains of the ingot and the final product, they are selectively contained when necessary. When any one or two or more of these are contained, if the content of Zr, Mn, Cr, or Sc is less than the lower limit, the content is insufficient and the strength is lowered. On the other hand, when the contents of Zr, Mn, Cr, and Sc exceed the respective upper limits, the elongation decreases because coarse crystals are formed.
  • the contents are as follows: Zr: 0.05 to 0.3%, Mn: 0.1 to 1.5%, Cr: 0.05 to 0.3%, Sc: 0.05 -0.3%, preferably Zr: 0.08-0.2%, Mn: 0.2-1.0%, Cr: 0.1-0.2%, Sc: 0.1- Each range is 0.2%.
  • Ag 0.01-0.2% Ag has an effect of closely and finely precipitating aging precipitates that contribute to strength improvement by artificial aging treatment after forming processing into a structural material, and has the effect of promoting high strength. Therefore, Ag is selectively contained as necessary. . If the Ag content is less than 0.01%, the effect of improving the strength is small. On the other hand, even if the Ag content exceeds 0.2%, the effect is saturated and expensive. Therefore, the Ag content is in the range of 0.01 to 0.2%.
  • Other elements are basically inevitable impurities. As a melting raw material, in addition to pure aluminum ingots, the inclusion of these impurity elements due to the use of aluminum alloy scrap is assumed (allowed), and each content within the range specified by the JIS standard of 7000 series alloys is allowed. .
  • Ti and B are impurities as a rolled plate, but also have the effect of refining the crystal grains of the ingot, so the upper limit of Ti is 0.2%, preferably 0.1%, and the upper limit of B is 0.05% or less, preferably 0.03%.
  • Fe and Si are allowed to be contained without affecting the characteristics of the aluminum alloy rolled sheet according to the present invention as long as Fe: 0.5% or less and Si: 0.5% or less.
  • the 7000 series aluminum alloy sheet structure of the present invention has the maximum endothermic peak temperature in the differential scanning calorimetry curve after room temperature aging for 2 weeks or more after solution treatment and quenching of the sheet. Is 130 ° C. or less, and the maximum exothermic peak height in the temperature range of 200 to 300 ° C. is 50 ⁇ W / mg or more.
  • the maximum endothermic peak temperature corresponds to the re-solution of clusters formed during aging of this plate at room temperature.
  • the lower the maximum endothermic peak temperature the lower the thermal stability of the cluster (which tends to decompose), and the easier it is to decompose by cutting dislocations during plastic deformation besides heat. Therefore, the lower the cluster stability is, the less likely it is to cause dislocation movement failure or strain concentration during plastic deformation, such as forming a plate into a structural material.
  • the maximum endothermic peak temperature is 130 ° C. or less.
  • the higher the stability of the cluster the higher the maximum endothermic peak temperature is higher than 130 ° C., the work hardening property is lowered, and the work hardening index n value (10 to 20%) is reduced to 0. Cannot be over 22.
  • the higher the stability of this cluster the more difficult it is to move dislocations during plastic deformation, such as forming a plate into a structural material. Since the movement of dislocations is concentrated, strain concentration is likely to occur and work hardening characteristics are deteriorated.
  • the maximum height of the exothermic peak in the temperature range of 200 to 300 ° C. corresponds to the precipitation of artificial aging precipitates (artificial aging precipitates) that contribute to the improvement of strength. Therefore, the higher the exothermic peak height, the greater the amount of artificial aging precipitates deposited (density) and the higher the strength.
  • This guideline is that the maximum height of the exothermic peak in the temperature range of 200 to 300 ° C. is 50 ⁇ W / mg or more. When the maximum height of the exothermic peak is less than 50 ⁇ W / mg, There is a high possibility that the 0.2% proof stress of the structural material cannot be 350 MPa or more.
  • a work hardening index n value (10 to 20%) is defined. That is, a 7000 series aluminum alloy plate manufactured by the above-described composition and structure and a preferable manufacturing method described later, and after hardening and quenching the plate, a work hardening index n value after aging at room temperature for 2 weeks or more as a standard (10 to 20%) is 0.22 or more.
  • Work hardening is a phenomenon in which hardness increases due to plastic deformation when stress is applied during molding, and is also called strain hardening. As the deformation progresses due to the molding process, the resistance increases and the hardness increases, which is work hardening.
  • This is a characteristic value that is an index of the molding processability and is called “n value”.
  • This n value is an index n obtained by approximating the relationship between the stress ⁇ and the strain ⁇ in the plastic region above the yield point.
  • the approximate expression is a Voc's expression that matches aluminum well.
  • n value the easier the work is hardened, and the hardened part that has undergone plastic deformation by molding such as bending becomes harder and the surrounding area is more easily deformed, so that molding processability such as bending is improved.
  • the n value the harder the work is hardened, and the part that is initially subjected to plastic deformation, the most stressed part does not become harder, but it becomes more plastically deformed and is more likely to be constricted and fractured. Low formability such as bending.
  • the 7000 series aluminum alloy plate can be manufactured by a manufacturing method according to a normal manufacturing process. That is, an aluminum alloy hot-rolled sheet having a thickness of 1.5 to 5.0 mm is manufactured through normal manufacturing processes such as casting (DC casting or continuous casting), homogenization heat treatment, and hot rolling. The Subsequently, it is cold-rolled to obtain a cold-rolled sheet having a thickness of 3 mm or less. At this time, one or more intermediate annealings may be selectively performed before cold rolling or in the middle of cold rolling.
  • an ordinary molten casting method such as a continuous casting method or a semi-continuous casting method (DC casting method) is appropriately selected for the aluminum alloy melt adjusted within the above-mentioned 7000-based component composition range. Cast.
  • homogenization heat treatment Next, the cast aluminum alloy ingot is subjected to a homogenization heat treatment prior to hot rolling.
  • the purpose of this homogenization heat treatment (soaking) is to homogenize the structure, that is, eliminate segregation in crystal grains in the ingot structure.
  • the soaking process is performed in two or two soaking steps.
  • Two-stage soaking means cooling after the first soaking, but it is not cooled to 200 ° C. or lower, and after stopping the cooling at a higher temperature, after maintaining at that temperature, Hot rolling is started after reheating to a high temperature.
  • the two-time soaking is once cooled to a temperature of 200 ° C. or less including room temperature, reheated and maintained at that temperature for a certain period of time. Start.
  • the transition element compound is finely dispersed, aiming to refine the compound that affects the moldability to the structural material.
  • solid solution of Zn, Mg, and Cu is promoted, aiming at work hardening characteristics at room temperature aging and strength improvement at artificial aging treatment.
  • the soaking temperature in the first stage or the first time is controlled to 400 to 450 ° C., preferably 400 to 440 ° C.
  • a Zr compound or a compound composed of Mn, Cr, or Sc can be finely dispersed. If this soaking temperature is less than 400 ° C., a sufficient effect of miniaturization cannot be obtained, and work hardening characteristics cannot be improved during aging at room temperature. On the other hand, if it exceeds 450 ° C., these compounds are coarsened, and it is impossible to improve the work-hardening characteristics at the time of aging at room temperature.
  • the holding time of the first or first soaking may be about 1 to 8 hours.
  • the second or second soaking temperature is controlled to 450 ° C. to the solidus temperature, preferably 470 ° C. to the solidus temperature.
  • the solid solution of Zn, Mg and Cu can be promoted, and the strength at the time of artificial aging treatment after solution treatment can be improved.
  • the soaking temperature is less than 450 ° C., sufficient dissolution of these elements cannot be obtained, and the work-hardening characteristics at room temperature aging and the strength after artificial aging do not increase.
  • the solidus temperature is exceeded, partial melting occurs and the mechanical properties deteriorate, so the upper limit is made the solidus temperature or lower.
  • the holding time during the second or second soaking may be about 1 to 8 hours.
  • the hot rolling start temperature is selected from the range of 350 ° C. to the solidus temperature and hot rolled to obtain a hot rolled sheet having a thickness of about 2 to 7 mm. Annealing (roughening) of the hot-rolled sheet before cold rolling is not necessarily required, but may be performed.
  • Cold rolling In cold rolling, the hot-rolled sheet is rolled into a cold-rolled sheet (including a coil) having a desired final thickness of about 1 to 3 mm. Intermediate annealing may be performed between cold rolling passes.
  • solution treatment After cold rolling, solution treatment is performed as a tempering.
  • the solution treatment is not particularly limited and may be heating and cooling using a normal continuous heat treatment line. However, in order to obtain a sufficient solid solution amount of each element and refinement of crystal grains, the holding time is predetermined at a solution treatment temperature of 450 ° C. to a solidus temperature, preferably 480 to 550 ° C. After reaching the solution treatment temperature, it is carried out in the range of 2 to 3 seconds and 30 minutes or less.
  • the average cooling (temperature decrease) speed after solution treatment is not particularly limited.
  • forced cooling means such as air cooling such as fans, water cooling means such as mist, spraying, and immersion are selected or combined. Or use in hot water from room temperature to 100 ° C.
  • the solution treatment is basically only one time, but when the room temperature age hardening has progressed too much, the solution treatment and the restoration treatment are made the above-mentioned preferable conditions in order to ensure the moldability to the automobile member. It may be applied again, and this excessive room temperature age hardening may be canceled once.
  • the aluminum alloy plate of the present invention is molded into an automobile member as a material and assembled as an automobile member. Further, after being molded into an automobile member, it is subjected to a separate artificial age hardening treatment to obtain an automobile member or an automobile body.
  • the 7000 series aluminum alloy plate of the present invention is made to have a desired strength as a structural material such as an automobile member and a 0.2% proof stress of 350 MPa or more, preferably 400 MPa or more by an artificial age hardening treatment after forming into a structural material.
  • the time point at which this artificial age hardening treatment is performed is preferably after the forming process of the material 7000 series aluminum alloy plate to the automobile member. This is because the 7000 series aluminum alloy plate after the artificial age hardening treatment has high strength but has low formability, and may not be formed depending on the complexity of the shape of the automobile member.
  • the temperature and time conditions of this artificial age hardening treatment are within the range of general artificial aging conditions (T6, T7) from the desired strength, the strength of the 7000 series aluminum alloy plate of the material, or the progress of room temperature aging. It is decided freely.
  • T6, T7 general artificial aging conditions
  • aging treatment at 100 to 150 ° C. is performed for 12 to 36 hours (including an overaging region).
  • the first-stage heat treatment temperature is in the range of 70 to 100 ° C. for 2 hours or longer
  • the second-stage heat treatment temperature is in the range of 100 to 170 ° C. for five hours or longer (overaging region). Select from).
  • the structure of the cold-rolled sheet was mainly controlled by changing various soaking conditions shown in Tables 3 and 4. Specifically, in common with each example, a 7000 series aluminum alloy molten metal having each component composition shown in Tables 1 and 2 below was DC-cast to obtain an ingot of 45 mm thickness ⁇ 220 mm width ⁇ 145 mm length. The ingot was subjected to two-stage soaking or twice soaking under the conditions of Tables 3 and 4. After the first soaking, the second stage soaking is cooled to 250 ° C., once the cooling is stopped at that temperature, reheated and held at the second stage soaking temperature, and cooled to the hot rolling start temperature. The hot rolling was started.
  • the second soaking was once cooled to room temperature, reheated and held at the second soaking temperature, cooled to the hot rolling start temperature, and then started hot rolling.
  • the only soaking process in Tables 3 and 4 does not perform the second reheating after being cooled once, but keeps the soaking temperature and time as usual, and then cools to the hot rolling start temperature. Started.
  • hot rolling was performed at the starting temperatures shown in Tables 3 and 4 to produce hot rolled sheets having a thickness of 5 mm.
  • the hot-rolled sheet was subjected to a roughing treatment in which forced air cooling was performed after holding at 500 ° C. for 30 seconds, and cold rolling was performed to 2 mm.
  • This cold-rolled sheet was subjected to a solution treatment at 500 ° C. for 1 minute in common with each example, and after this solution treatment, forced air cooling was performed to cool to room temperature to obtain a T4 tempered material.
  • a plate-like test piece was collected from the solution-treated aluminum alloy plate that had been aged at room temperature for two weeks in common with each example, and subjected to DSC measurement and tensile test. Each characteristic was investigated as follows.
  • DSC measurement differential thermal analysis: The DSC measurement (differential thermal analysis) conditions were the same under the following conditions in common with each example.
  • Test apparatus Seiko Instruments DSC220C, Standard material: pure aluminum, Sample container: pure aluminum, Temperature rising condition: 15 ° C./min, Atmosphere (in sample container): Argon gas (gas flow rate 50 ml / min), Test sample weight: 24.5 to 26.5 mg.
  • the sampling by differential thermal analysis is performed from 10 points including the front end, the center, and the rear end in the longitudinal direction of the aluminum alloy plate after aging at room temperature, and the measured values are averaged. Turned into.
  • the differential thermal analysis profile was horizontal in the 0-100 ° C. section of the differential thermal analysis profile.
  • N value The n value was measured by performing a room temperature tensile test in the direction perpendicular to the rolling direction, using the plate-like test piece after the artificial age hardening treatment as a JIS No. 5 tensile test piece (distance between gauge points 50 mm). Then, the true stress and true strain are calculated from the end point of yield elongation, plotted on a logarithmic scale with the horizontal axis being strain and the vertical axis being stress, and the gradient of the straight line represented by the measurement point is the nominal strain of 10% and 20%. The n value (10 to 20%) was calculated from the two points.
  • a current having a current density of 1 mA / cm 2 was allowed to flow for 24 hours in a state immersed in an aqueous sodium chloride solution (5% by mass), and then the sample was pulled up, and then the cross section of the test piece was cut and polished.
  • the magnification was x100, and a corrosion depth of 200 ⁇ m or less was evaluated as “ ⁇ ” as minor corrosion. Moreover, the case where it exceeded 200 micrometers was evaluated as "x" as big corrosion.
  • each invention example is within the composition range of the aluminum alloy of the present invention, and is manufactured within the range of the preferable manufacturing conditions described above.
  • the maximum endothermic peak temperature was 130 ° C. or lower, and the maximum exothermic peak in the temperature range of 200 to 300 ° C.
  • the height is 50 ⁇ W / mg or more and satisfies the tissue regulations analyzed by the DSC curve.
  • the work hardening index n value (10 to 20%) is as high as 0.22 or more, excellent in ductility, and excellent in workability to a structural material.
  • the BH property is excellent and the strength is high. It also has excellent corrosion resistance.
  • the composition example satisfying [Zn] ⁇ ⁇ 0.3 [Mg] +4.5 has a 0.2% proof stress of 350 MPa or more after artificial age hardening, and [Zn] ⁇ ⁇ .
  • Invention Examples 2, 4, 6, 8-12, 16-19, and 21 that satisfy both 0.5 [Mg] +5.75, the 0.2% proof stress after artificial age hardening is 400 MPa or more. is there.
  • each comparative example does not have both workability and strength because the alloy composition is out of the scope of the present invention or the manufacturing condition is out of the preferred range.
  • Comparative Example 26 in Table 4 As shown in Alloy No. 26 in Table 2, Zn is outside the lower limit.
  • Zn exceeds the upper limit as shown by Alloy No. 27 in Table 2.
  • Comparative Example 28 Cu is outside the lower limit as shown by Alloy No. 28 in Table 2.
  • Comparative Example 29 Cu exceeds the upper limit as shown by Alloy No. 29 in Table 2.
  • Comparative Examples 30 to 32 in Table 4 are manufactured out of the preferable manufacturing condition range although the invention example aluminum alloy of Alloy No. 2 in Table 1 is used.
  • Comparative Example 30 is a soaking treatment only once (corresponding to the second soaking). In Comparative Example 31, the first soaking temperature is too low. In Comparative Example 32, the second soaking temperature is too low. For this reason, the comparative example in which these soaking conditions deviate from the preferable range does not satisfy the structure rule analyzed by the DSC curve, and the work hardening index n value (10 to 20%) after aging at room temperature is less than 0.22. In other words, the 0.2% proof stress after the artificial age hardening treatment is less than 350 MPa, so that both workability and strength are not achieved.
  • Comparative Examples 40 to 43 in Table 4 the Mg content is outside the upper limit as shown in Alloy Nos. 37 to 40 in Table 2. Therefore, even if both of the relations [Zn] ⁇ ⁇ 0.3 [Mg] +4.5 and [Zn] ⁇ ⁇ 0.5 [Mg] +5.75 are satisfied, including soaking, Even if it is manufactured within the preferable manufacturing conditions, it does not satisfy the tissue regulations analyzed by the DSC curve. As a result, Comparative Examples 40 and 41 having relatively high Zn have a work hardening index n value (10 to 20%) after room temperature aging as low as 0.21 level, and do not have both workability and strength.
  • the present invention can provide a 7000 series aluminum alloy plate for automobile members having both strength, formability, and corrosion resistance. Therefore, the present invention is also suitable for automobile structural materials such as frames and pillars that contribute to weight reduction of the vehicle body, and structural materials for other uses.

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  • Chemical & Material Sciences (AREA)
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  • Physics & Mathematics (AREA)
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  • Crystallography & Structural Chemistry (AREA)
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Abstract

L'invention concerne une plaque en alliage d'aluminium série 7000 ayant une composition spécifique, la plaque en alliage d'aluminium étant fabriquée par un procédé classique et pourvue d'une résistance mécanique élevée par équilibre avec la teneur en Mg tandis que la teneur en Zn est supprimée, la plaque en alliage d'aluminium étant également pourvue d'une résistance mécanique, d'une aptitude au moulage et d'une résistance à la corrosion élevées nécessaire pour un matériau de structure, tel qu'une composition ayant une température de pointe spécifique d'absorption de chaleur spécifique et la hauteur maximum d'une pointe de génération de chaleur sur une courbe de calorimétrie à balayage différentiel pendant un vieillissement à température ambiante de la plaque fabriquée.
PCT/JP2014/056567 2013-03-14 2014-03-12 Plaque en alliage d'aluminium destinée à un matériau de structure Ceased WO2014142199A1 (fr)

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US14/767,096 US20150376742A1 (en) 2013-03-14 2014-03-12 Aluminum alloy sheet for structural material
CN201480011852.9A CN105143484A (zh) 2013-03-14 2014-03-12 结构材用铝合金板

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JP2016160515A (ja) * 2015-03-04 2016-09-05 株式会社神戸製鋼所 アルミニウム合金板
JP2018074938A (ja) * 2016-11-08 2018-05-17 東レ株式会社 悪性骨軟部腫瘍の検出用キット又はデバイス及び検出方法
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US10208371B2 (en) 2016-07-13 2019-02-19 Apple Inc. Aluminum alloys with high strength and cosmetic appeal
EP3504086B1 (fr) 2016-08-26 2022-08-03 Shape Corp. Procédé de formage à chaud pour le pliage transversal d'une poutre d'aluminium profilée pour former à chaud un composant structurel de véhicule
US11072844B2 (en) 2016-10-24 2021-07-27 Shape Corp. Multi-stage aluminum alloy forming and thermal processing method for the production of vehicle components
KR102457529B1 (ko) * 2017-03-07 2022-10-21 엘지전자 주식회사 알루미늄 합금
US11345980B2 (en) 2018-08-09 2022-05-31 Apple Inc. Recycled aluminum alloys from manufacturing scrap with cosmetic appeal
WO2020086671A1 (fr) * 2018-10-23 2020-04-30 Novelis Inc. Produits en alliage d'aluminium à haute résistance, formables, et leurs procédés de fabrication
JP7244195B2 (ja) * 2019-07-11 2023-03-22 株式会社神戸製鋼所 ７０００系アルミニウム合金製部材の製造方法
EP3848476A1 (fr) * 2020-01-07 2021-07-14 AMAG rolling GmbH Tôle ou bande en alliage d'aluminium durcissable, pièce de véhicule fabriquée à partir de celle-ci, utilisation et procédé de fabrication de tôle ou de bande
CN115572923B (zh) * 2022-09-09 2023-07-21 北京航空航天大学 一种基于原位电阻测量获得铝合金非等温时效制度的方法
CN118064773A (zh) * 2023-12-27 2024-05-24 天津大学 一种高强耐蚀可成形7xxx系铝合金及其制备方法

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JP2015175045A (ja) * 2014-03-17 2015-10-05 株式会社神戸製鋼所 構造材用アルミニウム合金板
JP2016160515A (ja) * 2015-03-04 2016-09-05 株式会社神戸製鋼所 アルミニウム合金板
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JP2018074938A (ja) * 2016-11-08 2018-05-17 東レ株式会社 悪性骨軟部腫瘍の検出用キット又はデバイス及び検出方法
JP2018204116A (ja) * 2018-08-27 2018-12-27 株式会社神戸製鋼所 アルミニウム合金板

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