WO2009093559A1 - アルミニウム合金板 - Google Patents
アルミニウム合金板 Download PDFInfo
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- WO2009093559A1 WO2009093559A1 PCT/JP2009/050722 JP2009050722W WO2009093559A1 WO 2009093559 A1 WO2009093559 A1 WO 2009093559A1 JP 2009050722 W JP2009050722 W JP 2009050722W WO 2009093559 A1 WO2009093559 A1 WO 2009093559A1
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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
- C22C21/02—Alloys based on aluminium with silicon as the next major constituent
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
- C22C21/06—Alloys based on aluminium with magnesium as the next major constituent
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/04—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
- C22F1/05—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 of the Al-Si-Mg type, i.e. containing silicon and magnesium in approximately equal proportions
Definitions
- the present invention relates to an aluminum alloy plate, and more particularly to an aluminum alloy plate excellent in ridging resistance (hereinafter, aluminum is also simply referred to as Al).
- the aluminum alloy sheet excellent in ridging mark resistance means an Al—Mg—Si based aluminum alloy sheet that can suppress surface irregularities (also referred to as ridging marks or roping) that occur during press forming of the panel.
- the aluminum alloy plate referred to in the present invention means a plate that has been subjected to tempering such as solution treatment and quenching after rolling, and before being formed into a panel by press molding or the like.
- panels such as outer panels (outer plates) and inner panels (inner plates) are made of thin and high-strength aluminum alloy plates, Al-
- Mg—Si-based AA or JIS 6000-based (hereinafter also simply referred to as 6000-based) aluminum alloy plates is being studied.
- the 6000 series aluminum alloy plate basically contains Si and Mg as essential elements and has excellent age-hardening ability, formability is ensured by reducing the yield strength during press molding and bending.
- 6000 series aluminum alloy plates are aging-hardened by heating during relatively low-temperature artificial aging (hardening) treatment, such as paint baking treatment of molded panels, and the proof strength is improved, and the required strength can be secured. Properties (bake hardness, artificial age hardenability, paint bake hardenability).
- the 6000 series aluminum alloy plate has a relatively small amount of alloy elements as compared with other 5000 series aluminum alloys having a large amount of alloy such as Mg. For this reason, when the scraps of these 6000 series aluminum alloy plates are reused as an aluminum alloy melting material (melting raw material), the original 6000 series aluminum alloy ingot is easily obtained, and the recyclability is excellent.
- an outer panel of an automobile is manufactured by combining an aluminum alloy plate with a forming process such as an overhang forming or a bending forming in press forming.
- a large outer panel such as a hood or a door is formed into a molded product shape of the outer panel by performing press molding such as overhanging on an aluminum alloy plate, and then a hem (hemming such as a flat hem around the outer panel peripheral portion).
- press molding such as overhanging on an aluminum alloy plate
- a hem hem
- the inner panel is joined to form a panel structure.
- the panel after press-molding made of a 6000 series aluminum alloy plate has a problem that surface rough defects such as ridging marks are likely to occur.
- the ridging mark is a phenomenon that occurs due to textures arranged in a streak pattern on the plate, and has irregularities on the plate surface during deformation such as press molding. For this reason, even if the crystal grains of the aluminum alloy plate as a raw material are fine enough not to cause rough skin, the ridging marks may be generated by press molding, which is a problem.
- This ridging mark is particularly likely to occur when the press molding conditions become severe due to the enlargement of the panel structure, the complicated shape, or the thinning of the panel structure.
- the ridging mark is relatively inconspicuous immediately after press molding, but has a problem that the ridging mark becomes conspicuous after proceeding directly to the coating process.
- the ingot is cooled at a temperature of 500 ° C. or higher after the homogenization heat treatment, or cooled to room temperature and reheated at a relatively low temperature of 350 to 450 ° C. It is known to prevent ridging marks on the excess Si type 6000 series aluminum alloy plate by starting the process or controlling the compound (see Patent Documents 1, 2, 3, and 10).
- the prior art has a certain effect on ridging mark suppression including control of the texture and characteristics of the plate as in Patent Documents 4 to 9.
- the molding conditions are more severe, such as when forming into a deeper panel or a more complicated three-dimensional panel, the effect is still insufficient.
- An object of the present invention is to provide an Al—Mg—Si based aluminum alloy sheet that can prevent the occurrence of ridging marks during press forming, which becomes prominent when the molding conditions are more severe, with good reproducibility.
- the gist of the aluminum alloy sheet of the present invention is as follows: Mg: 0.1 to 3.0% by mass, Si: 0.1 to 2.5% by mass, Mn: 0.01 to 1.%.
- Mg 0.1 to 3.0% by mass
- Si 0.1 to 2.5% by mass
- Mn 0.01 to 1.%.
- Cu 0.001 to 1.0% by mass, the balance being Al and inevitable impurities
- the plate width over an arbitrary length of 20 mm In this texture, when the plate widths are divided every 250 ⁇ m, the average value of the area ratios of the Goss orientations in the cross sections of the boarded portions is 3% or less.
- the difference between the maximum value and the minimum value of each area ratio is 2% or less, the average value of each area ratio of the Cube orientation in each plate cross section at the section is 10% or less, and these Cube Of each area ratio Difference between the value and the minimum value is that it is 5% or less.
- the aluminum alloy plate has Fe: 1.0 mass% or less, Cr: 0.3 mass% or less, Zr: 0.3 mass% or less, V: 0.3 mass% or less, Ti: 0.1 One or more of mass% or less, Ag: 0.2 mass% or less, Zn: 1.0 mass% or less (however, these do not include 0%) may be included.
- the present inventors examined whether the ridging mark of the aluminum alloy plate, which had been visually evaluated until now, could be quantified and evaluated.
- the surface of the board (panel) where ridging marks were generated on the surface when it was actually formed into a deeper panel or a more complicated three-dimensional panel, and the surface of the board (panel) that did not occur The shape of the unevenness was measured with a tracer (three-dimensional shape measuring instrument). Then, the obtained three-dimensional shape data on the surface of each plate (panel) was subjected to frequency analysis using analysis software.
- the present inventors have found that the ridging marks (surface irregularities) that are conspicuously generated on the plate (panel) when the molding conditions are stricter have a relatively large period of about 2 to 3 mm in the plate width direction. I have found that I have. In other words, the present invention has succeeded for the first time in quantitatively elucidating that a ridging mark that occurs remarkably has a relatively large period extending over a length of about 2 to 3 mm in the plate width direction.
- the mechanism of ridging mark generation in which ridging marks, which are variations in surface irregularities, are likely to occur because the introduction strain amount (crystalline deformation amount) of adjacent crystal grains differs depending on the crystal orientation.
- the recognition itself for this mechanism is the same as that in the above-mentioned patent document defining the crystal orientation.
- the Al—Mg—Si-based aluminum alloy having a plate width over a length of 20 mm, which is a relatively wide area equal to or greater than the ridging mark period. It differs greatly from the above-mentioned patent document in that the formability is improved by defining the state of the texture in the plate.
- the Goss direction and the Cube direction are selected as control targets. That is, in the present invention, in the comparatively wide region in the plate width direction, these crystal orientations are regulated by the average area ratios to reduce as much as possible, and each of the Goss orientation and the Cube orientation existing in this region. Is defined as the difference between the maximum value and the minimum value of the respective area ratios.
- the Al—Mg—Si based aluminum alloy plate according to the present invention is prominent when the molding conditions are more severe, such as being formed into a deeper panel or a more complicated three-dimensional panel. Generation of ridging marks having a large period can be prevented.
- the Goss azimuth and Cube azimuth have very large in-plane anisotropy of r value (Rankford value) compared to other azimuths.
- r value Rankford value
- the Goss orientation when the plate is pulled in the width direction, the plate thickness hardly decreases.
- the Goss orientation having such a behavior exists in the structure in a substantial amount, when the plate is press-molded, the elongation deformation ability differs particularly depending on the portion in the width direction of the plate, and the elongation deformation ability over the width direction of the plate is reduced. To do.
- the Cube orientation is the main orientation of the recrystallized texture of aluminum, as is generally known, and is one of the main crystal orientations in Al-Mg-Si alloys.
- the Cube orientation unlike the behavior in the Goss orientation, when the plate is pulled in the direction of 45 ° with respect to the rolling direction, the plate thickness is significantly reduced.
- a ridging mark (a large surface of the plate surface) is obtained when the distribution state of the Goss orientation and the Cube orientation in the relatively wide area in the plate width direction is more severe. Concerning unevenness) For this reason, in the present invention, in order to suppress this ridging mark, not only the orientation of these Goss orientation and Cube orientation in the relatively wide area of the above-mentioned plate but also the relatively wide area. The deviation of each existing azimuth is also reduced as much as possible.
- the texture of the plate width over an arbitrary length of 20 mm of the plate is determined by dividing the plate width every 250 ⁇ m.
- the average value of the area ratios of the Goss orientation in each plate cross section at the sectioned portion is 3% or less, and the difference between the maximum value and the minimum value of the area ratios of these Goss orientations is 2% or less.
- the average value of the respective area ratios of the Cube orientation in each plate section of the divided portion is 10% or less, and the difference between the maximum value and the minimum value of the respective area ratios of the Cube orientation is 5%. It is as follows.
- the ridging marks (surface irregularities) generated on the Al—Mg—Si-based aluminum alloy plate have a relatively large period of about 2 to 3 mm in length in the plate width direction. Therefore, in consideration of the variation, the average value of the area ratio of the Goss orientation in each plate section in the plate width direction is 3% or less in a comparatively large (wide) measurement range over the length of 20 mm or more at the minimum. In addition, it is necessary to suppress the average value of the area ratio of the Cube orientation to 10% or less.
- the difference between the maximum value and the minimum value of the area ratios of the Goss orientations in the cross sections of the divided portions (80 locations). Is 2% or less, and it is necessary that the difference between the maximum value and the minimum value of the area ratios of the Cube orientation is 5% or less.
- the Goss orientation and Cube orientation in the texture that causes ridging marks are reduced in the width direction of the Al—Mg—Si-based aluminum alloy sheet, and the texture that causes ridging marks is also sufficiently varied. Becomes smaller. As a result, when the main factor of ridging marks has been eliminated, the conditions for forming deeper or more complex three-dimensional panels such as overhanging large automobile panels such as hoods and doors have become stricter. However, the surface quality of the plate is greatly improved.
- FIG. Fig. 1 shows the results of measuring the shape of a ridging mark on the surface of the plate (the surface of the plate on which the ridging mark was generated) in the plate width direction with a tracer (three-dimensional shape measuring instrument), and the structure in the plate width direction measured by EBSP. (Plate cross section), changes in each area ratio (plate cross section) of Goss orientation and Cube orientation are also shown.
- the vertical direction of the figure is the plate thickness direction
- the upper side of the figure is the surface side of the plate (measurement surface side)
- the horizontal direction of the figure is the plate width direction.
- the measurement length of these plate width directions is 6 mm.
- the measurement plate of FIG. 1 is a comparative example 9 in an example (Table 3) described later.
- the present invention is the first time that the ridging mark itself has been grasped and the ridging mark resistance evaluation has been quantitatively performed by measuring and analyzing the plate surface unevenness profile by the above-described tracer.
- the quantitative grasp of the ridging mark itself is also significant because the quantitative grasp of the ridging mark itself is the basis of the present invention.
- this quantitative grasp leads to a quantitative scale for evaluating ridging mark resistance based on the amplitude ( ⁇ m) of the peaks and valleys of the concavo-convex curve in the plate surface concavo-convex profile as in Examples described later.
- the tracer measurement conditions and analysis method for quantitatively grasping the ridging mark itself will be described in detail in Examples described later.
- Fig. 1 the uppermost figure shows the structure measured by EBSP.
- the second diagram from the top shows changes in the plate width direction (plate cross section) of the respective area ratios of Goss orientation and Cube orientation.
- the second broken line (thick line) from the top is the Cube orientation
- the third broken line (bottom line) from the top (thick line) is the Goss orientation.
- the change in the plate width direction of the total area ratio of the Brass orientation, the S orientation, and the Cu orientation is also indicated by the top broken line (thin line) for reference.
- lower (1) to (3) indicate changes in the plate width direction of ridging marks (unevenness on the surface of the plate) generated on the plate, the shape of which was measured by the above-described tracer.
- FIG. 2 is a perspective view showing the measurement positions of the above items on the plate as the measurement target in FIG.
- the horizontal direction of the plate in FIG. 2 is the rolling direction (RD direction, plate longitudinal direction), and the diagonally up and down direction is the plate width direction. Is stretched 20% in the direction perpendicular to The plate surface portions (1) to (3) whose shape was measured by the tracer of FIG. 1 were directed to the plate width direction of FIG. 2 and three locations (1) to (3) spaced from each other by 1 mm in the rolling direction. ) Respectively.
- the EBSP measurement surface of the board cross section on the right side of the board is indicated by an arrow.
- the concave portion where the area ratio on the vertical axis (the level of the broken line) is the lowest is the minimum value of each area ratio.
- the convex part where the area ratio (the level of the broken line) on the vertical axis is the highest is the maximum value of each area ratio.
- the change in the plate width direction of the unevenness of the plate surface at each location shown in the above (1) to (3) is relatively large. It can be seen that the length (change) of the unevenness has a relatively large period of about 2 to 3 mm. It can be seen that the area ratios of the Goss orientation and the Cube orientation also change in the plate width direction in accordance with the length (change) of the unevenness in the plate width direction of the ridging mark.
- the distribution state of the Goss orientation and the Cube orientation in a relatively wide area of the plate is the main cause of unevenness (riding mark) on the plate surface as described above. It is done. Further, in order to suppress the ridging mark, as described above, not only the Goss orientation and the Cube orientation in the relatively wide area of the plate are restricted, but also the Goss existing in the relatively wide area. It is supported that the deviation of each of the azimuth and Cube azimuth (difference between the maximum value and the minimum value of the area ratio in the plate width direction) should be reduced as much as possible.
- the value of the plate width length of 20 mm which is the texture measurement range
- the value of the interval of 250 ⁇ m separating the plate widths are ridgings over a length (change) of about 2 to 3 mm in the plate width direction.
- the range in which the measured values do not differ greatly or the range in which the measured values are reproducible is selected. .
- each direction is expressed as follows. Expressions of these orientations are described in “Cross Texture” written by Shinichi Nagashima (published by Maruzen Co., Ltd.) and “Light Metal” Explanation Vol.43 (1993) P.285-293, etc.
- Cube orientation ⁇ 001 ⁇ ⁇ 100> Goss orientation: ⁇ 011 ⁇ ⁇ 100> CR orientation: ⁇ 001 ⁇ ⁇ 520> RW orientation: ⁇ 001 ⁇ ⁇ 110> [Cube orientation in which (100) plane rotates the plate surface] Brass orientation: ⁇ 011 ⁇ ⁇ 211> S orientation: ⁇ 123 ⁇ ⁇ 634> Cu orientation: ⁇ 112 ⁇ ⁇ 111> (Or D orientation: ⁇ 4411 ⁇ ⁇ 11118>) SB orientation: ⁇ 681 ⁇ ⁇ 112>
- the surface of the sample set in the SEM column is irradiated with an electron beam to project the EBSP on the screen. This is taken with a high-sensitivity camera and captured as an image on a computer. The orientation of the crystal is determined by analyzing this image by a computer and comparing it with a pattern obtained by simulation using a known crystal system.
- the crystal orientation analysis method using the above EBSP is not a measurement for each crystal grain but a measurement by scanning a specified sample region at an arbitrary fixed interval. Since this process is automatically performed for all measurement points, tens of thousands to hundreds of thousands of crystal orientation data can be obtained at the end of measurement. For this reason, there is an advantage that the observation field is wide and the average crystal grain size, the standard deviation of the average crystal grain size, or the information of the orientation analysis can be obtained within a few hours for a large number of crystal grains. Therefore, the crystal orientation analysis method using the EBSP is optimal when defining or measuring a wide texture in the plate width direction as in the present invention.
- a test piece for observing a structure is taken from each cross section of the plate, subjected to mechanical polishing and buff polishing, and then subjected to electrolytic polishing to adjust the surface.
- This is performed using an SEM apparatus such as SEM (JEOLJSM5410) manufactured by JEOL Ltd., for example, an EBSP measurement / analysis system manufactured by TSL: OIM (OrientationOrImaging Macrograph, analysis software name “OIMA Analysis”).
- the measurement area of the test piece is 1000 ⁇ m ⁇ 1000 ⁇ m, and the measurement step interval is, for example, 3 ⁇ m or less.
- the measurement region of the material to be measured is usually divided into hexagonal regions, and a Kikuchi pattern is obtained from the reflected electrons of the electron beam incident on the sample surface for each divided region.
- the orientation distribution on the sample surface can be measured.
- the crystal orientation at the electron beam incident position can be obtained. That is, the obtained Kikuchi pattern is compared with data of a known crystal structure, and the crystal orientation at the measurement point is obtained.
- the crystal orientation of the measurement point adjacent to the measurement point is obtained, and those whose crystal orientation difference is within ⁇ 15 ° (deviation within ⁇ 15 ° from the crystal plane) are located on the same crystal plane. Shall belong. Further, when the orientation difference between both crystals exceeds ⁇ 15 °, the interval (such as the side where both hexagons are in contact) is defined as the grain boundary. In this way, the distribution of grain boundaries on the sample surface is obtained.
- the measurement visual field range is, for example, an area of about 500 ⁇ m ⁇ 500 ⁇ m. Measurements are taken at several appropriate locations on the specimen and averaged.
- the average crystal grain size is made fine, that is, the crystal grain size is not coarsened. That is, it is preferable that each average crystal grain size in the above-described plate section is 50 ⁇ m or less. Moreover, bending workability and press formability are ensured or improved by making the crystal grain size fine and small in this range. When the crystal grain size becomes larger than 50 ⁇ m, even if the crystal orientation is controlled, the press formability such as bending workability and overhang is remarkably deteriorated, and defects such as cracking and rough surface occur during molding. easy.
- the average crystal grain size is the average value of the results of measuring the maximum diameter in the rolling direction of each crystal grain plate observed in a predetermined measurement region using the SEM-EBSP and its measurement conditions. Can be obtained.
- the composition of the aluminum alloy plate is as follows: Mg: 0.1 to 3.0% by mass, Si: 0.1 to 2.5% by mass, Mn: 0.01 to 1.0% Including mass%, Cu: 0.001 to 1.0 mass%, and the balance consisting of Al and inevitable impurities.
- the 6000 series aluminum alloy plate targeted by the present invention tends to generate ridging marks, but has an excellent BH property and an excess Si type 6000 having a Si / Mg mass ratio of 1 or more. It is preferable that a system aluminum alloy plate is applied.
- the 6000 series aluminum alloy sheet secures formability by reducing the yield strength during press molding and bending, and is age-hardened by heating during relatively low temperature artificial aging treatment such as paint baking treatment of the panel after molding. Yield strength is improved, and it has excellent age-hardening ability (BH property) that can secure the required strength.
- the excess Si type 6000 series aluminum alloy plate is more excellent in this BH property than the 6000 series aluminum alloy plate having a mass ratio Si / Mg of less than 1.
- these impurity elements is allowed within the range specified below.
- Fe 1.0 mass% or less
- Cr 0.3 mass% or less
- Zr 0.3 mass% or less
- V 0.3 mass% or less
- Ti 0.1% by mass or less
- Ag 0.2% by mass or less
- Zn 1.0% by mass or less
- Si 0.1 to 2.5% by mass Si, together with Mg, forms an aging precipitate that contributes to strength improvement during the above-described low temperature artificial aging treatment such as solid solution strengthening and paint baking treatment, and exhibits age hardening ability.
- Si is an indispensable element for obtaining a required strength (proof strength) of, for example, 180 MPa or more necessary for an outer panel of an automobile. Therefore, Si is the most important element for combining various properties of bending workability such as press formability and hemming in the excess Si type 6000 series aluminum alloy sheet of the present invention.
- the Si content is less than 0.1% by mass, the age-hardening ability and further various properties such as press formability and bending workability required for each application cannot be obtained. Furthermore, recrystallization is promoted by soaking and hot rolling, and the Goss orientation and the Cube orientation are easily developed, and the Goss orientation and the Cube orientation cannot be suppressed and controlled within the scope of the present invention.
- the Si content exceeds 2.5% by mass, the press workability including bending workability and ridging mark resistance is significantly hindered. Furthermore, weldability is also significantly impaired. Therefore, the Si content is in the range of 0.1 to 2.5% by mass, preferably in the range of 0.6 to 1.2% by mass.
- Mg 0.1 to 3.0% by mass Mg forms an aging precipitate that contributes to strength improvement together with Si during solid solution strengthening and artificial aging treatment such as paint baking treatment, and exhibits age hardening ability.
- Mg is an essential element for obtaining a required proof stress of, for example, 180 MPa or more as a panel.
- the Mg content is less than 0.1% by mass, the absolute amount of Mg is insufficient, so that the compound phase cannot be formed during the artificial aging treatment, and the age hardening ability cannot be exhibited. For this reason, the aluminum alloy plate cannot obtain the required proof stress of 180 MPa or more necessary as a panel. Furthermore, recrystallization is promoted by soaking and hot rolling, and Goss orientation and Cube orientation are easily developed, and Goss orientation and Cube orientation cannot be suppressed and controlled within the scope of the present invention. .
- the Mg content is preferably in the range of 0.1 to 3.0% by mass, and the Si / Mg content is preferably such that the mass ratio is 1.0 or more. Further, when the Si content is in the range of 0.6 to 1.2% by mass, the Mg content is preferably in the range of 0.2 to 0.7% by mass. .
- Cu 0.001 to 1.0 mass%
- Cu has the effect of promoting the formation of aging precipitates that contribute to improving the strength of the aluminum alloy material structure in the crystal grains under the conditions of the artificial aging treatment at a relatively low temperature for a short time of the present invention.
- solid solution Cu also has the effect of improving moldability. This effect is not obtained when the Cu content is less than 0.001% by mass, particularly less than 0.01% by mass.
- the Cu content exceeds 1.0% by mass, the stress corrosion cracking resistance, the thread rust resistance of the corrosion resistance after coating, and the weldability are significantly deteriorated. Therefore, the Cu content is set to 0.001 to 1.0% by mass, preferably 0.01 to 1.0% by mass.
- Mn 0.01 to 1.0% by mass
- Mn produces dispersed particles (dispersed phase) during the homogenization heat treatment, and these dispersed particles have the effect of hindering grain boundary movement after recrystallization, so that there is an effect that fine crystal grains can be obtained.
- the press formability and hemmability of the aluminum alloy plate of the present invention improve as the crystal grains of the aluminum alloy structure become finer. In this respect, when the Mn content is less than 0.01% by mass, these effects are not obtained.
- the Mn content increases, coarse Al—Fe—Si— (Mn, Cr, Zr) -based intermetallic compounds and crystal precipitates are easily generated during melting and casting, and the mechanical properties of the aluminum alloy sheet Causes the properties to deteriorate. Moreover, when Mn content exceeds 1.0 mass%, bending workability will fall. Therefore, the Mn content is in the range of 0.01 to 1.0% by mass, preferably in the range of 0.01 to 0.15%.
- the aluminum alloy sheet of the present invention is a conventional process or a known process, and the aluminum alloy ingot having the above-mentioned 6000 series component composition is subjected to homogenization heat treatment after casting, and then subjected to hot rolling and cold rolling to obtain a predetermined process. It is manufactured by being subjected to a tempering treatment such as solution hardening and quenching.
- a tempering treatment such as solution hardening and quenching.
- an ordinary molten casting method such as a continuous casting method and a semi-continuous casting method (DC casting method) is appropriately selected for the molten aluminum alloy adjusted to be dissolved within the above-mentioned 6000 series component composition range. Cast.
- the cooling rate during casting should be as large (fast) as 150 ° C / min or more from the melting temperature (about 700 ° C) to the liquidus temperature and 100 ° C / min or more from the liquidus temperature to the solidus temperature. Is preferred.
- the temperature (cooling rate) control in the high temperature region from the melting temperature (about 700 ° C.) to the liquidus temperature has been conventionally performed regardless of whether it is continuous casting or DC casting. Is hardly done. In such a case, the cooling rate in this high temperature region is inevitably slow.
- the cooling rate in the high temperature region becomes slow, the amount of crystallized material generated coarsely in the temperature range in this high temperature region increases, and the size of the crystallized material in the plate width direction of the ingot The variation in quantity also increases.
- the cooling rate from the dissolution temperature (about 700 ° C.) to the liquidus temperature is less than 150 ° C./min, and the cooling rate from the liquidus temperature to the solidus temperature is less than 100 ° C./min. In this case, it becomes particularly remarkable.
- the Goss orientation and the Cube orientation are easily developed, and the Goss orientation and the Cube orientation are within the scope of the present invention in order to improve the ridging mark resistance. It becomes impossible to suppress and control.
- the cooling rate in each of these high temperature regions is small, the amount of Mg and Si dissolved in the ingot decreases, so that the subsequent soaking and recrystallization in hot rolling are promoted, the Goss orientation and The Cube orientation is likely to develop, and the Goss orientation and Cube orientation cannot be suppressed or controlled within the scope of the present invention.
- homogenization heat treatment Next, the cast aluminum alloy ingot is subjected to homogenization heat treatment.
- a homogenization temperature 500 ° C. or higher and lower than the melting point is appropriately selected as usual.
- the purpose of this homogenization heat treatment (soaking) is to homogenize the structure, that is, eliminate segregation in crystal grains in the ingot structure. When this homogenization temperature is low, segregation within the crystal grains cannot be sufficiently eliminated, and this acts as a starting point of fracture, so that stretch flangeability and bending workability are deteriorated.
- the heating temperature rise conditions during the soaking process are 200 ° C. or lower and held at a low temperature of 100 ° C. or higher for 2 to 10 hours (h) and then at a rate of 300 ° C./hour (h) or higher 500 ° C. or higher.
- Heat to homogenization temperature By maintaining at a low temperature of 200 ° C. or lower and 100 ° C. or higher in the initial stage of soaking, fine precipitates can be uniformly dispersed. This fine precipitate significantly suppresses the growth of Goss orientation and Cube orientation.
- this so-called soaking process at a low temperature in the first stage if the holding temperature exceeds 200 ° C. or the holding time exceeds 10 hours, the precipitates become coarse and such an effect disappears, and the Goss orientation and Cube orientation becomes easier to develop. Further, if this holding temperature is less than 2 hours, the holding time is insufficient.
- the heating and heating rate from the above holding temperature to the soaking temperature is higher (faster) than 300 ° C./hour.
- the cooling rate after soaking is large (fast).
- the cooling rate after the homogenization heat treatment is less than about 20 ° C./hr.
- the cooling rate is about 30 to 40 ° C./hr even if it is left outside the batch soaking furnace.
- the cooling rate is insufficient, precipitates such as Mg—Si compounds are coarsened, and Goss orientation and Cube orientation are easily developed. Therefore, it is preferable to cool the ingot after the homogenization heat treatment using a forced cooling means such as a fan so that the cooling rate is 40 ° C./hr or more.
- Hot rolling is a rough rolling process for ingots (slabs) according to the sheet thickness to be rolled, and a finish rolling process for rolling a sheet having a sheet thickness of about 40 mm or less after rough rolling to a sheet thickness of about 4 mm or less. Is composed of.
- a reverse type or a tandem type rolling mill is used as appropriate, and rolling consisting of a plurality of passes is performed.
- the start temperature in the rough rolling is in a temperature range of 400 to 550 ° C.
- the total processing rate in the finish rolling is 90% or more
- the finish rolling finish temperature is 400 ° C. or less.
- the hot rolling (rough rolling) start temperature is less than 400 ° C.
- recrystallization does not proceed after the hot rolling is completed, and the processed structure remains, and ridging marks are likely to be generated.
- the hot rough rolling start temperature exceeds 550 ° C.
- recrystallization occurs, coarse recrystallized grains are generated during hot rolling, and Goss orientation and Cube orientation are easily developed. Become.
- the hot rolling end temperature is preferably 300 ° C. or higher and 400 ° C. or lower.
- the annealing (roughening) of the hot-rolled sheet before cold rolling is basically not performed. By omitting the annealing (roughening), it is possible to improve the efficiency of manufacturing the plate and reduce the manufacturing cost.
- Cold rolling In cold rolling, the hot-rolled sheet is rolled to produce a cold-rolled sheet (including a coil) having a desired final sheet thickness.
- the Goss orientation and the Cube orientation are suppressed by utilizing dispersed particles controlled within the scope of the present invention by soaking of the ingot.
- the temperature increase rate of the final solution treatment is 100 ° C./min or more.
- the solution treatment is preferably performed at a temperature not lower than 500 ° C. and not higher than the melting point in order to sufficiently precipitate aging precipitates that contribute to strength improvement by artificial aging treatment such as paint baking hardening after press molding of the plate. In the temperature range.
- the quenching treatment is performed by selecting and using water cooling means and conditions such as air cooling such as a fan, mist, spray, immersion, etc., respectively, thereby rapidly cooling the cooling rate to 10 ° C./second or more. It is preferable.
- a pre-aging treatment is performed after the quenching treatment in order to promote the precipitation of the age-related precipitates that contribute to strength improvement. You may do it.
- This preliminary aging treatment is preferably carried out in the temperature range of 60 to 150 ° C., preferably 70 to 120 ° C., while maintaining the necessary time for 1 to 24 hours.
- This preliminary aging treatment is performed by increasing the cooling end temperature of the quenching treatment to 60 to 150 ° C. and immediately reheating or holding it as it is.
- the preliminary aging treatment is performed by immediately reheating to 60 to 150 ° C. within 5 minutes after the solution treatment and quenching to room temperature.
- a heat treatment (artificial aging treatment) at a relatively low temperature may be performed after the preliminary aging treatment without time delay.
- room temperature aging naturally aging
- the effect of the heat treatment at the relatively low temperature is hardly exhibited.
- the quenching treatment is completed within the temperature range of the preliminary aging, and the coil is wound around a coil at the same high temperature.
- This treatment may be reheated before being wound on the coil, or may be kept warm after being wound.
- after the quenching process to room temperature it may be reheated to the above temperature range and wound at a high temperature.
- a 6000 series aluminum alloy sheet having the composition of A to K shown in Table 1 was subjected to homogenization heat treatment (abbreviated as soaking) and hot rolling (abbreviated as hot rolling) under the conditions shown in Table 2, and further cold rolled.
- soaking homogenization heat treatment
- hot rolling abbreviated as hot rolling
- More specific manufacturing conditions for the aluminum alloy plate are as follows. Ingots each having a composition shown in Table 1 and having a thickness of 500 mm, a width of 2000 mm, and a length of 7 m were melted in common by a DC casting method. At this time, as shown in Table 2, the cooling rate during casting (° C./min) is changed from the melting temperature (about 700 ° C.) common to each example to the liquidus temperature (about 650 ° C. which is almost the same in each example). ) And from this liquidus temperature to the solidus temperature (about 590 ° C., which is almost the same in each example).
- the conditions for performing the holding at a low temperature during heating and heating (the soaking process at the first stage low temperature: ° C. ⁇ h) and soaking are as follows.
- the heating temperature rising rate (° C./h) up to the heat treatment temperature was changed.
- the cooling after the soaking is commonly performed in each example, and the ingot is formed by a fan in a soaking furnace so that the specific cooling rate range of 60 ° C./hr, which is the preferable cooling condition described above, is obtained. Forced air cooling to a temperature of °C or less.
- hot rolling (rough rolling) is started at this temperature, and hot rolling to 2.5 mm in thickness (finish rolling). did.
- Table 2 shows the end temperature of hot rolling (finish rolling) in each example.
- the cold-rolled sheet is heated in a continuous heat treatment facility at a rate of temperature increase of about 300 ° C./min in common with each example, and held for 5 seconds when the solution treatment temperature reaches 550 ° C.
- Solution treatment was performed, and quenching was performed immediately to room temperature by rapid cooling at a cooling rate of 100 ° C./second or more. Further, within 5 minutes after this quenching (immediately), a preliminary aging (reheating) treatment was carried out at a temperature of 100 ° C. for 2 hours. After this preliminary aging treatment, T4 tempered material is obtained by slow cooling at 0.6 ° C./hr.
- test plate (blank) was cut out from each final product plate after the tempering treatment, and the structure and characteristics of each test plate after room temperature aging (standing at room temperature) on the 15th after the tempering treatment were measured and evaluated. .
- Test plate structure The texture of the test plate after aging at room temperature for 15 days after the tempering treatment was measured and analyzed using the SEM-EBSP. Simulating severe press forming, this test plate was stretched 20% in the plate width direction (perpendicular to the rolling direction) to give pre-strain, and between the plate widths of 20 mm in the center of the plate width, When the plate was divided every 250 ⁇ m in the direction (however, the interval between (1) to (3) in FIG. 2 was 1 mm), the plate cross section of each of the divided portions was used as the EBSP measurement surface.
- Test plate characteristics Furthermore, as characteristics of the test plate, ridging mark resistance, 0.2% proof stress (As proof stress: MPa), and elongation (%) were measured. These results are shown in Table 3.
- FIG. 5 shows data of comparative example 9 (FIG. 1) to be described later.
- the vertical axis represents the surface unevenness height of the plate
- the horizontal axis represents the length in the plate width direction.
- the location of the plate surface whose shape was measured by this tracer was the plate surface in the vicinity of the EBSP measurement surface of the test plate ((1) among the locations from (1) to (3) in FIG. 2). .
- the shape measurement conditions of the tracer are: measurement probe tip R 25 ⁇ m, measurement pitch 25 ⁇ m, measurement distance (plate width direction) 6000 ⁇ m (6 mm). Then, the surface roughness measurement data of this tracer is analyzed using the analysis software VIVIAN at the spatial frequency (in terms of spatial period in ⁇ m), the vertical axis is the frequency, and the horizontal axis is the relationship with the spatial frequency. An uneven profile was created. As a result of analyzing this profile, each comparative example in which ridging marks are generated has a characteristic peak at a spatial frequency of about 3 to 5 ⁇ 10 ⁇ 4 ⁇ m and 2 to 3 ⁇ m when converted to a spatial period. It was recognized that there was. This surface unevenness profiling data is illustrated in FIG.
- a portion surrounded by a dotted circle in FIG. 6 is a characteristic peak at 2 to 3 ⁇ m in terms of a spatial period. This is the basis that the ridging marks (surface irregularities) generated on the plate have a relatively large period ranging from about 2 to 3 mm in length in the plate width direction.
- this surface unevenness profile was filtered to remove a spatial frequency other than the spatial frequency considered to correspond to the ridging mark as noise, and a correction profile was created.
- This correction profile is illustrated in FIG. 7 (scan examples 1 to 4).
- the peaks and valleys of the uneven curve in the profile do not correspond to the rolling direction, but in the comparative example with the ridging mark, as shown in FIG.
- the valley corresponds to the rolling direction.
- the amplitude of the peaks and valleys of the concave and convex curves is significantly larger than that of the invention example without the ridging mark.
- the amplitude ( ⁇ m) of the peaks and valleys of the concave and convex curve that can be grasped numerically (quantitatively) from among the feature points indicating the presence or absence of ridging marks in the surface concave and convex profile A measure of ridging mark generation. That is, when the amplitude of the peaks and valleys of the concavo-convex curve was 0.3 ⁇ m or less, ridging marks were not actually generated, and ⁇ ⁇ ⁇ was evaluated as being excellent in press formability. In addition, when the amplitude exceeded 0.3 ⁇ m but was 0.5 ⁇ m or less, a ridging mark was generated, but it was relatively mild. Furthermore, when the amplitude exceeded 0.5 ⁇ m, a large ridging mark was generated as shown in FIG. 1, and even if the molding conditions were changed, the press formability (ridging mark resistance) was poor, and was evaluated as x. .
- each of the inventive examples is cast (cooling rate at the time of casting), homogenization heat treatment (low temperature holding, temperature rising / cooling rate) within the composition range of the present invention and within a preferable condition range. Hot rolling is performed. For this reason, as shown in Table 3, it has a texture defined by the present invention. That is, in order to suppress the ridging marks, not only the Goss orientation and the Cube orientation in the relatively wide area of the above-described plate are restricted, but also the Goss orientation and the Cube orientation existing in the relatively wide area. Each deviation is reduced as much as possible. In each of the inventive examples, the average crystal grain size is also 50 ⁇ m or less.
- each example of the invention is an example of a 6000 series aluminum alloy plate having an excess Si type composition that has been aged at room temperature after the tempering treatment and has reduced formability. Excellent ridging mark property. It also has excellent mechanical properties such as strength and elongation.
- Comparative Examples 8 to 12 use the same alloy example as that of Invention Example 2 above.
- the production conditions for casting cooling rate at the time of casting
- homogenization heat treatment at the time of temperature increase
- the average amplitude in the unevenness on the plate surface is larger than that of the above-described invention example, and the ridging mark resistance is inferior.
- Comparative Example 8 the cooling rate from the melting temperature (about 700 ° C.) to the liquidus temperature and the cooling rate from the liquidus temperature to the solidus temperature are both too small (too slow) during the casting.
- Comparative Example 9 does not hold a low temperature of 200 ° C. or lower and 100 ° C. or higher among the heating temperature rising conditions during soaking. In Comparative Example 10, this low temperature holding temperature is too low. In Comparative Example 11, the heating temperature increase rate after this low temperature holding is too small (too slow). In Comparative Example 12, this low temperature holding temperature is too high.
- FIG. 3 shows Invention Example 1 and FIG. 4 shows Comparative Example 11 similar to FIG. 1 in the structure in the plate width direction (plate cross section) measured by EBSP, and the area ratios of Goss orientation and Cube orientation.
- the change in the width direction (plate cross section) is also shown.
- the invention example 1 in FIG. 3 has a Goss orientation (bottom thick line at the bottom) in the comparatively wide width direction region of the plate as compared with the comparative example 11 in FIG. )
- the Cube orientation the thick line at the top of the black circle
- the deviations of the Goss orientation and the Cube orientation existing in this relatively wide width region are also small. I understand.
- the thin circled thin line is the Brass orientation
- the triangular marked thin line is the S orientation
- the US marked thin line is the Cu orientation.
- the vertical direction of the drawing is the plate thickness direction
- the upper side of the drawing is the surface side of the plate (measurement surface side)
- the horizontal direction of the drawing is the plate width direction. It is.
- Comparative Examples 13 to 16 are within the preferred range and are cast (cooling rate at the time of casting) and homogenized heat treatment (at the time of temperature increase), but the component composition is out of the scope of the present invention. Accordingly, the ridging mark resistance is remarkably inferior to that of the inventive examples from the viewpoint of the component composition, or the strength and elongation are remarkably inferior to those of the inventive examples even if the ridging mark resistance is good.
- the results of the above examples support the critical significance or effect of combining the ridging mark resistance and mechanical properties of the requirements of the components and structures in the present invention, or preferable production conditions.
- an Al—Mg—Si-based aluminum alloy that can prevent ridging marks during press molding, which become prominent when the molding conditions become more severe, can be prevented with good reproducibility, and has excellent mechanical properties.
- the application of the 6000 series aluminum alloy plate can be expanded for transporting devices such as automobiles, ships or vehicles, home appliances, buildings, structural members and parts, and particularly for transporting devices such as automobiles. .
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Abstract
Description
Goss方位およびCube方位は、他の方位に比べてr値(ランクフォード値)の面内異方性が非常に大きい。Goss方位では、板をその幅方向に引っ張った場合に、板厚減少がほとんど生じない。このような挙動を有するGoss方位が組織内に実質量存在すると、板をプレス成形した場合に、特に板の幅方向の部位による伸び変形能力が異なり、かつ板の幅方向にわたる伸び変形能力が低下する。一方、Cube方位は、一般的にも知られている様に、アルミの再結晶集合組織の主方位であり、Al-Mg-Si系合金においても主要な結晶方位の1つである。このCube方位では、Goss方位の前記挙動とは異なり、圧延方向に対して45°方向に板を引っ張った場合に、著しい板厚減少が生じる。
集合組織のでき方は、結晶系が同じでも加工法によって異なり、圧延材の場合は圧延面と圧延方向で表わされる。すなわち、下記に示す様に、圧延面は{○○○}で表現され、圧延方向は<△△△>で表現される。なお、○や△は整数を示している。
Cube方位:{001}<100>
Goss方位:{011}<100>
CR方位:{001}<520>
RW方位:{001}<110>[Cube方位が(100)面で板面回転した方位]
Brass方位:{011}<211>
S方位:{123}<634>
Cu方位:{112}<111>
(若しくは、D方位:{4411}<11118>)
SB方位:{681}<112>
これら結晶粒の各結晶方位成分の面積率(存在率)は、前記した板断面を、走査型電子顕微鏡SEM(Scanning Electron Microscope)による、後方散乱電子回折像EBSP(Electron Backscatter Diffraction Pattern)を用いた結晶方位解析方法(SEM/EBSP法)により測定される。
リジングマークを抑制するためには、平均結晶粒径が微細化されること、すなわち、結晶粒径が粗大化されないことが好ましい。すなわち、前記した板断面での各平均結晶粒径は各々50μm以下であることが好ましい。また、結晶粒径をこの範囲に細かく、小さくすることによって、曲げ加工性やプレス成形性が確保または向上される。結晶粒径が50μmを越えて粗大化した場合、前記した結晶方位を制御しても、曲げ加工性や張出などのプレス成形性が著しく低下し、成形時の割れや肌荒れなどの不良が生じ易い。
以下、本発明が対象とする6000系アルミニウム合金板の化学成分組成について説明する。本発明が対象とする6000系アルミニウム合金板は、前記したように自動車の外板用の板などに用いられるため、優れた成形性やBH性、強度、溶接性、耐食性などの諸特性が要求される。
Siは、Mgとともに、固溶強化と、塗装焼き付け処理などの前記低温での人工時効処理時に、強度向上に寄与する時効析出物を形成して、時効硬化能を発揮する。このように、Siは、自動車のアウタパネルとして必要な、例えば180MPa以上の必要強度(耐力)を得るための必須の元素である。したがって、Siは、本発明過剰Si型6000系アルミニウム合金板において、プレス成形性、ヘム加工などの曲げ加工性の諸特性を兼備させるための最重要元素である。
Mgは、固溶強化と、塗装焼き付け処理などの前記人工時効処理時に、Siとともに強度向上に寄与する時効析出物を形成して、時効硬化能を発揮する。このように、Mgは、パネルとして、例えば180MPa以上の必要耐力を得るための必須の元素である。
Cuは、本発明の比較的低温短時間の人工時効処理の条件では、アルミニウム合金材組織の結晶粒内への強度向上に寄与する時効析出物の形成を促進させる効果がある。また、固溶したCuは成形性を向上させる効果もある。Cu含有量が0.001質量%未満、特に0.01質量%未満ではこの効果がない。一方、Cu含有量が1.0質量%を越えると、耐応力腐食割れ性や、塗装後の耐蝕性の内の耐糸さび性、また溶接性を著しく劣化させる。このため、Cu含有量は0.001~1.0質量%、好ましくは0.01~1.0質量%とする。
Mnは、均質化熱処理時に分散粒子 (分散相) を生成し、これらの分散粒子には再結晶後の粒界移動を妨げる効果を有するため、微細な結晶粒を得ることができるという効果がある。前記した通り、本発明のアルミニウム合金板のプレス成形性やヘム加工性は、アルミニウム合金組織の結晶粒が微細なほど向上する。この点、Mn含有量が0.01質量%未満ではこれらの効果がない。
次に、本発明アルミニウム合金板の製造方法について説明する。本発明アルミニウム合金板は、製造工程自体は常法あるいは公知の方法であり、上記6000系成分組成のアルミニウム合金鋳塊を鋳造後に均質化熱処理し、熱間圧延、冷間圧延が施されて所定の板厚とされ、更に溶体化焼入れなどの調質処理が施されて製造される。但し、耐リジングマーク性向上のために、Goss方位およびCube方位の集合組織を本発明の範囲に制御するためには、下記鋳造時の冷却速度条件や均熱処理条件を制御する必要がある。
まず、溶解、鋳造工程では、上記6000系成分組成範囲内に溶解調整されたアルミニウム合金溶湯を、連続鋳造法、半連続鋳造法(DC鋳造法)等の通常の溶解鋳造法を適宜選択して鋳造する。
鋳造時の冷却速度は、溶解温度(約700℃)から液相線温度までを150℃/分以上、液相線温度から固相線温度までを100℃/分以上と大きく(速く)することが好ましい。ただ、これまで、連続鋳造にしても、DC鋳造法にしても、このような、溶解温度(約700℃)から液相線温度までの、高温領域での温度(冷却速度)制御は、従来はほとんど行われていない。このような場合、この高温領域での冷却速度は必然的に遅くなる。
次に、前記鋳造されたアルミニウム合金鋳塊に均質化熱処理を施す。均質化熱処理の温度自体は、常法通り、500℃以上で融点未満の均質化温度が適宜選択される。この均質化熱処理(均熱処理)は、組織の均質化、すなわち、鋳塊組織中の結晶粒内の偏析をなくすことを目的とする。この均質化温度が低いと結晶粒内の偏析を十分に無くすことができず、これが破壊の起点として作用するために、伸びフランジ性や曲げ加工性が低下する。
熱間圧延は、圧延する板厚に応じて、鋳塊(スラブ)の粗圧延工程と、粗圧延後の板厚が約40mm以下の板を約4mm以下の板厚まで圧延する仕上げ圧延工程と、から構成される。これら粗圧延工程や仕上げ圧延工程では、リバース式あるいはタンデム式などの圧延機が適宜用いられ、各々複数のパスからなる圧延が施される。
この熱延板の冷間圧延前の焼鈍(荒鈍)は、基本的に行なわないことが好ましい。焼鈍(荒鈍)を省略することによって、板製造の効率化や製造コストの低減が図れる。
冷間圧延では、上記熱延板を圧延して、所望の最終板厚の冷延板(コイルも含む)を製作する。
上記鋳塊の均熱によって本発明範囲内のサイズ分布と量とに制御した分散粒子を活用し、最終の溶体化および焼入れ処理において、リジングマークを抑制するために、Goss方位やCube方位を抑制するためには、最終の溶体化処理の昇温速度を100℃/分以上とすることが好ましい。
前記調質処理後15日間の室温時効後の供試板の集合組織を、前記SEM-EBSPを用いて、測定・解析した。厳しいプレス成形を模擬して、この供試板に対し板幅方向に(圧延と直角方向に)20%ストレッチして予ひずみを付与し、板幅中央部の20mmにわたる板幅間を、板幅方向に250μm毎に各々区切った際の(但し、前記図2の(1)~(3)の間隔は1mm)、これら区切られた箇所の各板断面をEBSP測定面とした。すなわち、これら区切られた箇所の各板断面における、Goss方位、Cube方位の各面積率の平均値、これらGoss方位、Cube方位の各面積率の内の最大値と最小値との差を測定、解析した。また、このEBSP測定の際、同時に供試板の平均結晶粒径も測定した。これらの結果を表3に示す。
更に、前記供試板の特性として、耐リジングマーク性、0.2%耐力(As耐力: MPa)、伸び(%)を各々測定した。これらの結果を表3に示す。
前記20%ストレッチした後の供試板の集合組織測定・解析部分(板の板幅中央部)の幅方向表面を、コントレーサー(3次元形状測定器)で形状測定するとともに、得られた3次元形状データを、解析ソフトにより、周波数解析した。この3次元形状データを周波数解析した結果を図5に例示する。図5(スキャン例1~4)は、後述する比較例9(図1)のデータであり、図5の縦軸は板の表面凹凸高さ、横軸は板幅方向の長さである。なお、このコントレーサーで形状測定した板表面の箇所は、前記供試板のEBSP測定面近傍の板表面(図2の(1)~(3)までの箇所の内の(1))である。
Claims (2)
- Mg:0.1~3.0質量%、Si:0.1~2.5質量%、Mn:0.01~1.0質量%、Cu:0.001~1.0質量%を含み、残部がAlおよび不可避的不純物からなるAl-Mg-Si系アルミニウム合金板において、
この板の任意の20mmの長さにわたる板幅の集合組織は、この板幅間を250μm毎に各々区切った際に、
これら区切られた箇所の各板断面におけるGoss方位の各面積率の平均値が3%以下であるとともに、これらGoss方位の各面積率の内の最大値と最小値との差が2%以下であり、
前記区切られた箇所の各板断面におけるCube方位の各面積率の平均値が10%以下であるとともに、これらCube方位の各面積率の内の最大値と最小値との差が5%以下であることを特徴とするアルミニウム合金板。 - Fe:1.0質量%以下、Cr:0.3質量%以下、Zr:0.3質量%以下、V:0.3質量%以下、Ti:0.1質量%以下、Ag:0.2質量%以下、Zn:1.0質量%以下(但し、これらは全て0%を含まない)の1種以上を含む請求項1に記載のアルミニウム合金板。
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JP2010242215A (ja) * | 2009-03-19 | 2010-10-28 | Kobe Steel Ltd | 成形時のリジングマーク性に優れたアルミニウム合金板 |
GB2552399A (en) * | 2016-02-26 | 2018-01-24 | Uacj Corp | Hot forming aluminium alloy plate and production method therefor |
US10513766B2 (en) | 2015-12-18 | 2019-12-24 | Novelis Inc. | High strength 6XXX aluminum alloys and methods of making the same |
US10538834B2 (en) | 2015-12-18 | 2020-01-21 | Novelis Inc. | High-strength 6XXX aluminum alloys and methods of making the same |
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JP2007247000A (ja) * | 2006-03-16 | 2007-09-27 | Kobe Steel Ltd | 成形時のリジングマーク性に優れたアルミニウム合金板の製造方法 |
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JP2010242215A (ja) * | 2009-03-19 | 2010-10-28 | Kobe Steel Ltd | 成形時のリジングマーク性に優れたアルミニウム合金板 |
US10513766B2 (en) | 2015-12-18 | 2019-12-24 | Novelis Inc. | High strength 6XXX aluminum alloys and methods of making the same |
US10538834B2 (en) | 2015-12-18 | 2020-01-21 | Novelis Inc. | High-strength 6XXX aluminum alloys and methods of making the same |
US11920229B2 (en) | 2015-12-18 | 2024-03-05 | Novelis Inc. | High strength 6XXX aluminum alloys and methods of making the same |
GB2552399A (en) * | 2016-02-26 | 2018-01-24 | Uacj Corp | Hot forming aluminium alloy plate and production method therefor |
US11932928B2 (en) | 2018-05-15 | 2024-03-19 | Novelis Inc. | High strength 6xxx and 7xxx aluminum alloys and methods of making the same |
CN110760723A (zh) * | 2019-07-19 | 2020-02-07 | 北京工业大学 | 一种铝镁硅铒锆合金及提高高温力学性能的制备工艺 |
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CN101918602A (zh) | 2010-12-15 |
KR20100093616A (ko) | 2010-08-25 |
JP4312819B2 (ja) | 2009-08-12 |
JP2009173971A (ja) | 2009-08-06 |
CN101918602B (zh) | 2012-07-04 |
KR101180226B1 (ko) | 2012-09-05 |
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