EP3850119A1 - Almgmn alloy product with improved corrosion resistance - Google Patents
Almgmn alloy product with improved corrosion resistanceInfo
- Publication number
- EP3850119A1 EP3850119A1 EP19790635.7A EP19790635A EP3850119A1 EP 3850119 A1 EP3850119 A1 EP 3850119A1 EP 19790635 A EP19790635 A EP 19790635A EP 3850119 A1 EP3850119 A1 EP 3850119A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- weight
- sheet
- content
- carried out
- temperature
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000005260 corrosion Methods 0.000 title claims abstract description 36
- 230000007797 corrosion Effects 0.000 title claims abstract description 36
- 229910045601 alloy Inorganic materials 0.000 title description 24
- 239000000956 alloy Substances 0.000 title description 24
- 229910000838 Al alloy Inorganic materials 0.000 claims abstract description 27
- 238000005096 rolling process Methods 0.000 claims abstract description 26
- 238000000034 method Methods 0.000 claims abstract description 21
- 238000004519 manufacturing process Methods 0.000 claims abstract description 14
- 239000000203 mixture Substances 0.000 claims abstract description 14
- 229910052802 copper Inorganic materials 0.000 claims abstract description 13
- 229910052726 zirconium Inorganic materials 0.000 claims abstract description 13
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 12
- 238000012360 testing method Methods 0.000 claims abstract description 12
- 229910052719 titanium Inorganic materials 0.000 claims abstract description 11
- 239000012535 impurity Substances 0.000 claims abstract description 8
- 238000009749 continuous casting Methods 0.000 claims abstract description 3
- 230000004580 weight loss Effects 0.000 claims abstract 2
- 238000005098 hot rolling Methods 0.000 claims description 27
- 238000010438 heat treatment Methods 0.000 claims description 14
- 238000000265 homogenisation Methods 0.000 claims description 9
- 230000002441 reversible effect Effects 0.000 claims description 7
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical group [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 claims description 5
- 238000010276 construction Methods 0.000 claims description 5
- 238000003303 reheating Methods 0.000 claims description 3
- FGUUSXIOTUKUDN-IBGZPJMESA-N C1(=CC=CC=C1)N1C2=C(NC([C@H](C1)NC=1OC(=NN=1)C1=CC=CC=C1)=O)C=CC=C2 Chemical compound C1(=CC=CC=C1)N1C2=C(NC([C@H](C1)NC=1OC(=NN=1)C1=CC=CC=C1)=O)C=CC=C2 FGUUSXIOTUKUDN-IBGZPJMESA-N 0.000 claims 1
- -1 in% by weight Substances 0.000 claims 1
- 229910052782 aluminium Inorganic materials 0.000 abstract description 7
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 abstract description 7
- 229910052742 iron Inorganic materials 0.000 abstract description 3
- 239000004411 aluminium Substances 0.000 abstract 1
- 239000011777 magnesium Substances 0.000 description 18
- 208000004209 confusion Diseases 0.000 description 16
- 239000010949 copper Substances 0.000 description 16
- 206010013395 disorientation Diseases 0.000 description 16
- 239000011651 chromium Substances 0.000 description 12
- 229910052749 magnesium Inorganic materials 0.000 description 12
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 11
- 239000010936 titanium Substances 0.000 description 11
- 239000011572 manganese Substances 0.000 description 10
- 239000011701 zinc Substances 0.000 description 8
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 6
- 229910052748 manganese Inorganic materials 0.000 description 6
- 238000004458 analytical method Methods 0.000 description 5
- 238000005097 cold rolling Methods 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 5
- 230000007774 longterm Effects 0.000 description 5
- 238000003466 welding Methods 0.000 description 5
- 238000005266 casting Methods 0.000 description 4
- 238000001887 electron backscatter diffraction Methods 0.000 description 4
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 238000002360 preparation method Methods 0.000 description 4
- 229910052710 silicon Inorganic materials 0.000 description 4
- 229910018134 Al-Mg Inorganic materials 0.000 description 3
- 229910018467 Al—Mg Inorganic materials 0.000 description 3
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 3
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 3
- 238000013507 mapping Methods 0.000 description 3
- 239000010703 silicon Substances 0.000 description 3
- 229910052725 zinc Inorganic materials 0.000 description 3
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 2
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 238000000137 annealing Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 238000013213 extrapolation Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910017604 nitric acid Inorganic materials 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000004626 scanning electron microscopy Methods 0.000 description 2
- 238000000638 solvent extraction Methods 0.000 description 2
- 230000006641 stabilisation Effects 0.000 description 2
- 238000011105 stabilization Methods 0.000 description 2
- 229910019752 Mg2Si Inorganic materials 0.000 description 1
- 206010070834 Sensitisation Diseases 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 229910052790 beryllium Inorganic materials 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 229910052796 boron Inorganic materials 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002149 energy-dispersive X-ray emission spectroscopy Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 235000012438 extruded product Nutrition 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 229910052732 germanium Inorganic materials 0.000 description 1
- 229910052738 indium Inorganic materials 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 229910052758 niobium Inorganic materials 0.000 description 1
- 238000002161 passivation Methods 0.000 description 1
- 238000001953 recrystallisation Methods 0.000 description 1
- 238000012552 review Methods 0.000 description 1
- 229910052702 rhenium Inorganic materials 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 230000008313 sensitization Effects 0.000 description 1
- 230000001235 sensitizing effect Effects 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 238000007655 standard test method Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 229910052712 strontium Inorganic materials 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000009864 tensile test Methods 0.000 description 1
- 229910052718 tin Inorganic materials 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- 229910052727 yttrium Inorganic materials 0.000 description 1
Classifications
-
- 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
-
- 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
- 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
Definitions
- the invention relates to the field of rolled products such as sheets or strips of aluminum alloy of the AlMgMn type, the Mg content of which is at least 4% by weight having a high mechanical resistance, advantageous welding properties and good corrosion resistance for structural applications, such as, for example, boats, offshore constructions or industrial vehicles.
- the ASTM B928 standard requires the NAMLT test (ASTM G67 - Loss of Mass after Exposure to Nitric Acid) to characterize the resistance to intergranular corrosion. This standard specifies in paragraph 10 the resistance to intergranular corrosion after treatment 7-day post-production thermal at 100 ° C for state H128. Resistance and resistance after welding must not be reduced.
- French patent application FR2731019 relates to a particular alloy composition, subsequently registered with the G Aluminum Association under the designation 5383, containing inter alia 3 to 5% of magnesium and 0.5 to 1% of manganese, in which the sum contents (in% by weight) Mn + 2Zn is> 0.75.
- This composition makes it possible to obtain laminated or extruded products having a significantly better resistance to fatigue and a significantly lower crack propagation speed than the known products intended for the same application.
- the cited patent application gives no indication of the corrosion resistance of the product.
- French patent application FR2740144 claims a very narrow composition, within the ranges of composition of alloys 5083 and 5086, containing inter alia 4.3 to 4.8% of magnesium and less than 0.5% of manganese, allowing to obtain good characteristics during large deformations. This request also does not mention corrosion resistance.
- Patent application US2011017055 relates to aluminum alloys 5xxx and products produced from these are described.
- the alloys described consist essentially of: from 2.5% by weight% to 7% by weight Mg; from 0.05% by weight% to 2% by weight Cu; from 0.3% by weight% to 1.5% by weight Mn optionally up to 2.0% by weight Zn; optionally up to 1.0% by weight% total of additives, in which the additives are chosen from the group consisting of Zr, Cr, V, Sc, Hf, Ti, B, C, Ca, Sr, Be, Bi , Cd, Ge, In, Mo, Nb, Ni, Sn, Y; and the remainder being aluminum and unavoidable impurities.
- New 5xxx aluminum alloy products may allow an improved combination of properties, for example, through the presence of copper.
- the new 5 xxx aluminum alloy products are capable of obtaining an improved combination of properties by heat treatment in solution.
- Patent application CN 104404411 relates to a process for the production of aluminum alloy sheets which comprises the following steps: firstly, carrying out a homogenization heat treatment on an aluminum alloy ingot, in which the mass fraction of magnesium to aluminum alloy ingot is 4.0% -4.9%, to perform primary deformation by hot rolling to obtain an intermediate aluminum alloy plate; finally, to carry out a secondary hot rolling on the alloy plate of intermediate aluminum to obtain an aluminum alloy plate.
- the process for the production of aluminum alloy sheets is particularly suitable for the production of plates of marine aluminum alloy, and is aimed in particular at the H116 state of an aluminum alloy 5083
- the alloy plate of aluminum produced by the process of producing aluminum alloy sheets with high corrosion resistance and mechanical properties.
- Patent application CN104152759 relates to high-strength and corrosion-resistant Al-Mg alloys of alloy and a technology for their preparation.
- the components of the alloy are the following in percentage by mass: 5.0 to 6.5% of Mg, 1.2 to 2.5% of Zn, 0 to 0.4% of Cu, 0.4 to 1 , 2% Mn, 0 to 0.1% Cr, 0 to 0.15% Ti, 0.05 to 0.25% Zr, 0 to 0.4% Fe, 0 to 0.4 % of Si and the rest of Al and the inevitable impurities.
- the manufacturing process includes the steps of casting, homogenization, hot rolling, recrystallization annealing, cold rolling, stabilization treatment, as well as pre-stretching.
- Patent application CN 106244872 relates to a preparation process for a panel of medium thickness of aluminum alloy Al-Mg having a high resistance to corrosion for marine applications.
- the preparation process includes the stages of homogenization annealing heat treatment, hot rolling, cold rolling and heat treatment stabilization heat treatment.
- Patent application WO2018104004 relates to a method of manufacturing a wear-resistant laminated aluminum alloy product comprising the steps of: providing an aluminum alloy plate having Mg from 4.20% to 5.5 %, Mn from 0.50% to 1.1% up to 0.40%, Si up to 0.30%, Cu up to 0.20%, Cr up to 0.25%, Zr up to '' at 0.25%, Zn up to 0.30%, Ti up to 0.25%, hot roll to an intermediate thickness of 15 mm to 40 mm then hot roll to a final thickness from 3 mm to 15 mm and in which the outlet temperature of the hot rolling mill is between 130 and 285 ° C and then cool to room temperature. This request also does not mention corrosion resistance.
- the problem to which the present invention attempts to respond is therefore to propose laminated products of AlMgMn alloy having after long-term exposure an improved corrosion resistance while keeping good mechanical characteristics before and after welding, having a good resistance to fatigue and can be developed at the lowest cost.
- a first object of the invention is a method of manufacturing an aluminum alloy sheet in which
- an aluminum alloy of composition is prepared, in% by weight
- At least one element chosen from Ti, Cr, Cu and Zr with a content if it is chosen from 0.01 - 0.15 for Ti, 0.05 - 0.25 for Cr, 0.02 - 0.25 for Cu, 0.05 - 0.25 for Zr,
- said rolling plate is homogenized
- a hot rolling step on a tandem rolling mill up to a thickness between 3 and 12 mm, in which the final temperature is at least 240 ° C and is less than 300 ° C,
- said sheet is cold rolled, to a thickness of between 1 and 4 mm,
- a second object of the invention is a sheet of aluminum alloy with a thickness of between 1 and 12 mm in composition, in% by weight,
- At least one element chosen from Ti, Cr, Cu and Zr with a content if it is chosen from 0.01 - 0.15 for Ti, 0.05 - 0.25 for Cr, 0.02 - 0.25 for Cu, 0.05 - 0.25 for Zr,
- Yet another object of the invention is the use of a sheet metal the invention in shipbuilding or for the construction of industrial vehicles.
- Figures 1A and 1B describe the analysis of disorientation in granular areas for the KAM measurement.
- Ligure 2 illustrates the relationship between KAM measurement and corrosion result in the test
- the static mechanical characteristics in tension in other words the tensile strength Rm, the conventional elastic limit at 0.2% elongation Rpo, 2, and the elongation at break A%, are determined by a tensile test according to standard EN ISO 6892-1 / ASTM E8 - E8M-13, the sampling and the direction of the test being defined by standard EN 485-1. Unless otherwise stated, the definitions of standard EN 12258 (2012) apply.
- Corrosion tests are carried out according to standards ASTM B928 / B928M and ASTM G66 / G67.
- the Applicant has surprisingly found that a specific composition of Al-Mg alloys combined with a specific rolling process makes it possible to obtain the targeted corrosion properties.
- the method according to the invention comprises the steps of preparing an alloy according to the invention casting, optionally homogenization, hot rolling in two stages, optionally cold rolling, and optionally final heat treatment.
- composition limits used are explained as follows:
- the addition of magnesium ensures good mechanical resistance. Below 4.0% by weight, the mechanical strength is insufficient. In addition, below 4.0% by weight, the alloy generally has no corrosion problem and the present invention is of little interest. Above 5.2% by weight, the problem of thermal sensitization to corrosion becomes so strong that even the implementation of the present invention no longer makes it possible to obtain products which can be used in a corrosive medium.
- the magnesium content is between 4.0 and 4.6% by weight and preferably between 4.1 and 4.5%, the products obtained being particularly resistant to corrosion.
- the magnesium content is between 4.7 and 5.2% by weight and preferably between 4.7 and 5.0% by weight, the products obtained in particular having a high mechanical resistance after welding.
- Manganese improves tensile strength and decreases the tendency of the metal to recrystallize. Below 0.40% by weight of manganese, the present invention is of no industrial interest since the tensile strength is too low. Above 1%, the elongation at break, the toughness and the resistance to fatigue become too low for the intended applications.
- the manganese content is advantageously between 0.45 and 0.60% by weight.
- the manganese content is advantageously between 0.70 and 0.90% by weight.
- Zinc in the presence of manganese, improves the breaking strength, but beyond 0.40% by weight the Applicant has observed difficulties concerning the shaping of the products and / or the resistance to corrosion after welding.
- the presence of at least 0.15% by weight simultaneously improves the corrosion properties and the mechanical resistance.
- the Zn content is between 0.15 and 0.35% by weight and preferably between 0.18 and 0.30% by weight.
- Titanium, chromium, copper and zirconium also have a favorable effect on the elastic limit, and at least one element is chosen from Ti, Cr, Cu and Zr, with a content if it is chosen from 0.01 - 0.15 for Ti, 0.05 - 0.25 for Cr, 0.02 - 0.25 for Cu, 0.05 - 0.25 for Zr, in percentage by weight.
- the elements added are titanium, chromium and copper, the zirconium content being less than 0.05% by weight and preferably less than 0.03% by weight.
- the copper content is at least 0.05% by weight and preferably at least 0.06% by weight. In one embodiment of the invention, the copper content is at most 0.15% by weight and preferably 0.10% by weight.
- the chromium content is less than 0.1% by weight and preferably less than 0.09% by weight
- the iron content does not have much influence in the context of the present invention; it should be less than 0.40% by weight and preferably less than 0.35% by weight to avoid the formation of primary phases during casting.
- the silicon content is less than 0.40% by weight.
- a minimum content of 0.05% by weight to ensure the formation of silicon phases such as Mg2Si is preferred.
- the maximum silicon content is 0.15% by weight.
- the chosen temperature is between 535 ° C and 550 ° C for a period of at least 12 hours.
- the present inventors have found that, surprisingly, excellent results are obtained in the absence of homogenization.
- the homogenization step is not carried out, but simple reheating is carried out before hot rolling at a temperature between 490 and 535 ° C, preferably between 495 and 525 ° C and preferably between 500 and 520 ° C.
- a tandem rolling mill is a rolling mill in which several cages supporting rolling mill rolls, typically 3, 4 or 5 act successively (“in tandem”). Typically the sheets obtained are wound at the outlet of the tandem rolling mill.
- the inlet temperature during the first rolling step is advantageously between 470 ° C and 525 ° C, preferably between 480 ° C and 515 ° C and preferably between 490 ° C and 505 ° C.
- the first step on a reversible rolling mill can be carried out on one or even two reversible rolling mills placed successively.
- the inlet temperature for the second hot rolling step is preferably between 350 ° C and 450 ° C.
- the final temperature of the second hot rolling step must be below 300 ° C. The present inventors have in fact found that if this temperature is too high, the corrosion resistance properties are insufficient.
- the final temperature during the second hot rolling step is between 240 ° C and 280 ° C.
- the reduction in thickness Re effected at a temperature between 240 ° C and 380 ° C is sufficient.
- the final temperature is at least 250 ° C or more preferably 260 ° C.
- the thicknesses el and e2 are not available, they can be estimated from the inlet and outlet temperatures and inlet and outlet thicknesses, respectively T inlet, T_output, Ep inlet and Ep outlet during the second stage of hot rolling by extrapolation linear
- the present inventors have found that the properties are advantageous when a thickness reduction Re of at least 30% is carried out at a temperature between 240 ° C and 380 ° C.
- the present inventors have found that a reduction in thickness Re of at least 65% carried out at a temperature between 240 ° C. and 380 ° C. during the second hot rolling step is particularly advantageous, this advantageous reduction in thickness making it possible in particular to improve the granular structure and the resistance to corrosion after long-term exposure.
- the sheet obtained can optionally be cold rolled to a thickness of between 1 and 7 mm and preferably between 2 and 4 mm (MPa).
- a final heat treatment of the hot-rolled and optionally cold-rolled sheet at a temperature below 300 ° C. can finally optionally be carried out.
- the final heat treatment is carried out at a temperature between 180 and 280 ° C, preferably between 190 and 220 ° C, for a duration typically between 1 h and 10 h.
- This type of treatment can in certain cases improve the corrosion resistance properties.
- the final heat treatment is not essential and in an advantageous embodiment, the final heat treatment step is not carried out and the sheet is used in the raw state of manufacture, it that is to say according to the gross case of hot rolling or cold rolling.
- the aluminum alloy sheets which can be obtained by the process according to the invention are advantageous because after exposure for 7 days at 100 ° C. they exhibit a loss in weight of less than 15 mg / cm 2 during a corrosion test. according to ASTM G67 standard.
- the granular structure of the samples was characterized by scanning electron microscopy (EBSD) using the disorientation analysis in the granular areas by the KAM method (Kernel Average Misorientation) described for example in the article "A review of strain analysis using electron backscatter diffraction ". Stuart I. Wright and al. Microsc. Microanal. 17, 316-329, 2011.
- the local disorientation mapping of each sample is obtained by the kernel method. For a determined pixel, the mean of disorientation between this pixel and all of its first neighbors (hexagonal pixels) belonging to the same grain is calculated, as illustrated in the Figure 1. In the context of this measurement, a grain is defined by a disorientation of 5 ° and a minimum size of 20mhi, for a measurement step 0.15mhi. The local mean disorientation value is assigned to the central point.
- Figure 1 A illustrates the case in which all the first neighbors, pixels 1 to 6, of the central pixel A are part of the same grain. The average of the AgK disorientations for pixel A is then obtained by the average of the Ag Ai disorientations with respect to pixels 1 to 6.
- Figure 1 B illustrates the case in which some of the first neighbors, pixels 5 and 6, of the central pixel A belong to a grain different from that of the central pixel.
- the average of the disorientation for pixel A is then obtained by the average of the disorientation with respect to pixels 1 to 4.
- the average value of the disorientations for each pixel of the mapping is defined as the average degree of disorientation KAM or the measure KAM.
- the software EDAX OIM v7.3.0.
- the present inventors have found that advantageously the degree of mean disorientation KAM is at least 0.75.
- Table 1 composition of the plates in% by weight
- the plates were heated to 520 ° C. and then were hot rolled in two successive stages to obtain a sheet.
- a first step hot rolling was carried out on a reversible rolling mill up to a thickness of between 26 and 29 mm for alloys A to C and 15 to 17 mm for alloys D and E with an inlet temperature on the reversible between 490 ° C and 510 ° C.
- a second step hot rolling was carried out on a tandem rolling mill to a thickness of between 4 and 7 mm, thickness at which the sheets were wound, the rolling conditions in the tandem rolling mill are given in the table 2.
- a heat treatment at 340 ° C was carried out after hot rolling to simulate the effect of a tandem outlet temperature of 340 ° C.
- a treatment of 2 hours at 210 ° C. was carried out after cold rolling.
- Table 4 Results of corrosion tests and characterization of grain disorientation by the KAM method.
- the products obtained with the process according to the invention show a result after such NAMLT H128 of less than 15 mg / cm2.
- the products according to the invention, the magnesium content of which is less than or equal to 4.6% by weight have a mean degree of disorientation KAM of at least 0.75, as illustrated in FIG. 2.
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Metal Rolling (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1858257A FR3085968B1 (en) | 2018-09-13 | 2018-09-13 | PRODUCT IN AlMgMn ALLOY WITH IMPROVED CORROSION RESISTANCE |
PCT/FR2019/052061 WO2020053507A1 (en) | 2018-09-13 | 2019-09-09 | Almgmn alloy product with improved corrosion resistance |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3850119A1 true EP3850119A1 (en) | 2021-07-21 |
EP3850119B1 EP3850119B1 (en) | 2024-03-06 |
Family
ID=65201428
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19790635.7A Active EP3850119B1 (en) | 2018-09-13 | 2019-09-09 | Almgmn alloy product with improved corrosion resistance |
Country Status (6)
Country | Link |
---|---|
US (1) | US20220049335A1 (en) |
EP (1) | EP3850119B1 (en) |
AU (1) | AU2019338972A1 (en) |
FR (1) | FR3085968B1 (en) |
SG (1) | SG11202102459PA (en) |
WO (1) | WO2020053507A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
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CN115747585B (en) * | 2022-11-25 | 2024-03-01 | 航天科工(长沙)新材料研究院有限公司 | Heat-resistant aluminum alloy piece and preparation method thereof |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5758903A (en) * | 1980-09-25 | 1982-04-09 | Nippon Steel Corp | Hot rolling method for hot strip |
JPS6475104A (en) * | 1987-09-14 | 1989-03-20 | Sumitomo Metal Ind | Hot rolling equipment |
FR2731019B1 (en) | 1995-02-24 | 1997-08-22 | Pechiney Rhenalu | WELDED CONSTRUCTION PRODUCT IN ALMGMN ALLOY WITH IMPROVED MECHANICAL RESISTANCE |
FR2740144B1 (en) | 1995-10-18 | 1997-11-21 | Pechiney Rhenalu | ALMG ALLOY FOR WELDED CONSTRUCTS WITH IMPROVED MECHANICAL CHARACTERISTICS |
EP2456899A4 (en) | 2009-07-24 | 2015-01-14 | Alcoa Inc | Improved 5xxx aluminum alloys and wrought aluminum alloy products made therefrom |
CN104404411A (en) | 2014-12-15 | 2015-03-11 | 西南铝业(集团)有限责任公司 | 5 series aluminium alloy plate production method |
EP3314031B1 (en) * | 2015-06-25 | 2018-11-07 | Hydro Aluminium Rolled Products GmbH | High strength and easily reformable almg tape and method for producing the same |
CN106244872A (en) | 2016-08-30 | 2016-12-21 | 吉林化工学院 | A kind of preparation method of the Al Mg Aluminum Alloy Plate material peculiar to vessel of high corrosion-resistant |
CN110036127A (en) * | 2016-12-08 | 2019-07-19 | 爱励轧制产品德国有限责任公司 | The method for manufacturing wear-resistant aluminum alloy plate product |
-
2018
- 2018-09-13 FR FR1858257A patent/FR3085968B1/en active Active
-
2019
- 2019-09-09 US US17/275,669 patent/US20220049335A1/en active Pending
- 2019-09-09 EP EP19790635.7A patent/EP3850119B1/en active Active
- 2019-09-09 WO PCT/FR2019/052061 patent/WO2020053507A1/en unknown
- 2019-09-09 SG SG11202102459PA patent/SG11202102459PA/en unknown
- 2019-09-09 AU AU2019338972A patent/AU2019338972A1/en active Pending
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US20220049335A1 (en) | 2022-02-17 |
WO2020053507A1 (en) | 2020-03-19 |
EP3850119B1 (en) | 2024-03-06 |
SG11202102459PA (en) | 2021-04-29 |
AU2019338972A1 (en) | 2021-03-18 |
FR3085968A1 (en) | 2020-03-20 |
FR3085968B1 (en) | 2022-08-12 |
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