• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The invention relates to a method of manufacturing a part comprising a formation of successive solid metal layers (201 ... 20n) superimposed on each other, each layer describing a pattern defined from a numerical model (M) each layer being formed by the deposition of a metal (25), said filler metal, the filler metal being subjected to a supply of energy so as to melt and form, by solidifying, said layer, wherein the filler metal is in the form of a powder (25), whose exposure to an energy beam (32) results in a melting followed by solidification to form a solid layer (201. ..20n), the method being characterized in that the filler metal (25) is an aluminum alloy comprising at least the following alloying elements: Cr, in a mass fraction of between 2% and 10% ; - Zr, according to a mass fraction of between 0.5% and 5%. The invention also relates to a part obtained by this method. The alloy used in the additive manufacturing process according to the invention makes it possible to obtain parts with remarkable mechanical performances while obtaining a process whose productivity is advantageous.
    公开号:FR3077524A1
    申请号:FR1870138
    申请日:2018-02-08
    公开日:2019-08-09
    发明作者:Bechir Chehab
    申请人:C Tec Constellium Technology Center SAS；
    IPC主号:
    专利说明:

    TECHNICAL AREA
    The technical field of the invention is a method of manufacturing an aluminum alloy part, using an additive manufacturing technique.
    PRIOR ART
    Since the 1980s, additive manufacturing techniques have developed, which consist of shaping a part by adding material, in contrast to machining techniques, aimed at removing material. Formerly confined to prototyping, additive manufacturing is now operational for mass production of industrial products, including metal parts.
    The term additive manufacturing is defined according to the French standard XP E67-001: all of the processes making it possible to manufacture, layer by layer, by adding material, a physical object from a digital object. ASTM F2792-10 also defines additive manufacturing. Different additive manufacturing methods are also defined and described in ISO / ASTM 17296-1. The use of additive manufacturing to produce an aluminum part, with low porosity, was described in the document W02015006447. The application of successive layers is generally carried out by applying a so-called filler material, then melting or sintering the filler material using an energy source of the laser beam, electron beam type, plasma torch or electric arc. Whatever the additive manufacturing method applied, the thickness of each added layer is of the order of a few tens or hundreds of microns.
    A means of additive manufacturing is the melting or sintering of a filler material taking the form of a powder. It can be fusion or sintering by an energy beam.
    We know in particular the selective laser sintering techniques (selective laser sintering, SLS or direct metal laser sintering, DMLS), in which a layer of metal powder or metal alloy is applied to the workpiece and is selectively sintered according to the digital model with thermal energy from a laser beam. Another type of metal forming process includes selective laser melting (SLM) or electron beam melting (EBM), in which the thermal energy supplied by a laser or a directed electron beam is used to selectively melt (instead of sinter) the metal powder so that it fuses as it cools and solidifies. Also known is laser melting deposition (LMD) in which the powder is sprayed and melted by a laser beam simultaneously.
    Patent DE 10 2007 018 123 describes a rapid prototyping method for obtaining a structural component in which the starting material is an aluminum-scandium alloy.
    Patent application WO2016 / 209652 describes a method for manufacturing aluminum with high mechanical resistance comprising: the preparation of an atomized aluminum powder having one or more approximate powder size (s) desired and an approximate morphology; sintering the powder to form a product by additive manufacturing; dissolution; quenching; and the income from additively produced aluminum.
    Patent application US20170016096 describes a process for manufacturing a part by localized fusion, in particular obtained by exposing a powder to an energy beam of electron beam or laser beam type, the powder consisting of a aluminum alloy whose copper content is between 5% and 6% by mass, the magnesium content being between 2.5% and 3.5% by mass.
    Patent application EP2796229 discloses a process for manufacturing a metal alloy of aluminum reinforced by dispersion comprising the steps consisting in: obtaining, in powder form, an aluminum alloy composition which is capable of acquiring a dispersion-reinforced microstructure; directing a low energy density laser beam onto a part of the powder having the composition of the alloy; removing the laser beam from the portion of the powdered alloy composition; and cooling the portion of the powdered alloy composition at a speed greater than or equal to about 10 6 ° C per second, thereby forming the dispersion-reinforced aluminum metal alloy. The method is particularly suitable for an alloy having a composition according to the following formula: AI C ompFe a SibXc, in which X represents at least one element chosen from the group consisting of Μη, V, Cr, Mo, W, Nb and Ta; "A" ranges from 2.0 to 7.5 atom%; "B" ranges from 0.5 to 3.0 atom%; "C" ranges from 0.05 to 3.5 atom%; and the balance is aluminum and accidental impurities, provided that the ratio [Fe + Si] / Si is in the range of about 2.0: 1 to 5.0: 1.
    Patent application US2016 / 0138400 describes alloys comprising from 3 to 12% by weight of iron, from 0.1 to 3% by weight of vanadium, from 0.1 to 3% by weight of silicon and from 1.0 to 6% by weight of copper, aluminum residue and impurities, suitable for additive manufacturing techniques.
    The publication "Characterization of Al-Fe-V — Si heat-resistant aluminum alloy components fabricated byselective laser melting", Journal of Material Research, Vol. 30, No. 10, May 28, 2015, describes the manufacture by SLM of heat-resistant components of composition, in% by weight, AI-8.5Fe-l.3V-l.7Si.
    The publication “Microstructure and mechanical properties of Al-Fe-V-Si aluminum alloy produced by electron beam melting”, Materials Science & Engineering A659 (2016) 207-214, describes parts of the same alloy as in the previous article obtained by EBM.
    The patent application US 2018/010216 describes alloys based on aluminum and magnesium and containing zirconium produced by rapid solidification processes and parts obtained by additive manufacturing.
    The mechanical properties of the aluminum parts obtained by additive manufacturing depend on the alloy forming the filler metal, and more precisely on its composition, on the parameters of the additive manufacturing process as well as on the heat treatments applied. The inventors have determined an alloy composition which, used in an additive manufacturing process, makes it possible to obtain parts with remarkable mechanical performance, while obtaining a process whose productivity is advantageous.
    STATEMENT OF THE INVENTION
    A first object of the invention is a method of manufacturing a part comprising the formation of successive solid metal layers, superimposed on each other, each layer describing a pattern defined from a digital model, each layer being formed by the deposition of a metal, called filler metal, the filler metal being subjected to a supply of energy so as to melt and to constitute, by solidifying, said layer, in which the filler metal takes the form of a powder, the exposure of which to an energy beam results in a fusion followed by solidification so as to form a solid layer, the process being characterized in that the filler metal is an alloy of aluminum comprising the following alloying elements:
    Cr, according to a mass fraction of between 2% and 10%;
    Zr, according to a mass fraction of between 0.5% and 5%.
    The addition of such a zirconium content to an alloy containing chromium makes it possible to obtain a part with improved hardness, in particular by reducing the risk of cracking, which is in particular advantageous for parts of additive manufacturing. This is why it is preferable that the mass fraction of chromium is at least 3% and preferably at least 4%. A preferred maximum mass fraction of chromium is 8% or even 6%. A preferred minimum zirconium mass fraction is 0.75% and preferably 1%. A preferred maximum zirconium mass fraction is 3%.
    The alloy can also optionally comprise at least one, or even at least two elements or even at least three elements chosen from:
    Mn, according to a mass fraction between 0.06% and 6%, preferably at most 3% and preferably at most 2%;
    Ti, according to a mass fraction of between 0.01% and 5%, preferably at least 0.1%, preferably at most 3%, preferably at most 2% and preferably at least plus 1%;
    V, according to a mass fraction of between 0.06% and 6%, preferably at most 3%, preferably at most 2% and preferably at most 1%;
    These elements can lead to the formation of dispersoids or of fine intermetallic phases making it possible to increase the hardness of the material obtained. These elements can also have a beneficial effect on the thermal stability of the alloy by increasing the temperature and or the time required to reach the hardness peak.
    The alloy can also comprise at least one, or even at least two elements or even at least three elements chosen from:
    Ag, according to a mass fraction of between 0.06 and 1%;
    Li, according to a mass fraction of between 0.06 and 1%;
    Cu, according to a mass fraction of between 0.06 and 5%, the Cu content being less than the Cr content and preferably between 0.1 and 2%;
    Zn, according to a mass fraction of between 0.06 and 1%.
    The elements Ag, Cu, Zn and Li can act on the resistance of the material by hardening precipitation or by their effect on the properties of the solid solution.
    Optionally, at least one element chosen from Sc, Hf, W, Nb, Ta, Y, Yb, Nd, Er, Co, Ni can be added with a mass fraction of at least 0.06% and at most 5% preferably at most 3%, preferably at most 2% and preferably at most 1%, so as to form more dispersoids or fine intermetallic phases. However, in one embodiment, the addition of Sc is avoided, the preferred mass fraction then being less than 0.05% and preferably less than 0.01%.
    Optionally, at least one element chosen from La, Ce or mischmetal can be added, with a mass fraction of at least 0.06% and at most 6%, preferably at most 3%, preferably at most 2% and preferably not more than 1%.
    Optionally, at least one element chosen from Bi, Sr, Sn, Ba, Ca, Sb, P and B can be added, with a mass fraction of at least 0.01% and at most 1% and preferably of at least 0.06% and at most 0.8%. However, in one embodiment, the addition of Bi is avoided, the preferred mass fraction then being less than 0.05% and preferably less than 0.01%.
    The alloy can also contain Mg in a mass fraction of at least 0.06% and at most 0.5%. However, the addition of Mg is not recommended and the Mg content is preferably kept below an impurity value of 0.05% by mass.
    Fe and / or Si can be voluntarily added to the alloy in a mass fraction of at least 0.06% and at most 1% each, and preferably at least 0.1% and at most 2% each, and preferably at least 0.5% and at most 1% each, which can provide additional hardening by the formation of dispersoids. The content of Fe and / or Si can also be linked in certain cases to the cost of the alloy, it may indeed be favorable not to use a starting metal that is too pure. In one embodiment, the content of Fe and / or Si is maintained less than or equal to a level of 0.5% and preferably 0.2%, which makes it possible to use a less pure alloy without risk of increasing the mechanical characteristics in the raw state of manufacture which would lead to problems of distortion and / or cracking of the part.
    The material has a mass fraction of other elements or impurities of less than 0.05%, or 500 ppm. The cumulative mass fraction of other elements or impurities is less than 0.15%. An element which is not selected as an addition element has a mass fraction of less than 0.05%, or even less depending on the preferred content of this addition. In a preferred embodiment of the invention, the aluminum alloy consists of, in mass fraction, at least 2% and at most 10% and preferably at least 3% and at most 9% of Cr, at least 0.5% and at most 6% and preferably at least 0.75% and at most 3% of Zr, at least 0.06% and at most 6% and preferably at least 0.5% and at most 4 % of Mn, at most 0.5% of Fe and Si, other elements or impurities less than 0.05%, the cumulative mass fraction of the other elements or impurities being less than 0.15%.
    The powder can be obtained by conventional atomization processes from an alloy according to the invention in liquid or solid form or, alternatively, the powder can be obtained by mixing primary powders before exposure to the energy beam, different compositions of the primary powders having an average composition corresponding to the composition of the alloy according to the invention.
    It is also possible to add preferably nanoscale infusible particles, for example oxides or T1B2 particles or carbon nanoparticles, before the preparation of the powder by atomization and / or during the deposition of the powder and / or during the mixing of the primary powders. . However, in one embodiment of the invention, no infusible particles are added.
    According to one embodiment, the method comprises, following the formation of the layers:
    heat treatment typically at a temperature of at least 100 ° C and at most 550 ° C and preferably greater than 300 ’C or preferably greater than 350 ° C and / or hot isostatic compression or CIC.
    The heat treatment can in particular allow a stress relieving of the residual stresses and / or an additional precipitation of hardening phases.
    The CIC treatment notably improves the elongation properties and the fatigue properties. Hot isostatic compression can be performed before, after or in place of the heat treatment.
    Advantageously, the hot isostatic compression is carried out at a temperature between 250 ° C and 550 ° C and preferably between 300 ° C and 500 ° C, or preferably greater than 350 ° C, at a pressure between 500 and 3000 bars and for a period of between 0.5 and 10 hours.
    Heat treatment and / or hot isostatic compression makes it possible in particular to increase the hardness of the product obtained.
    According to another embodiment suitable for alloys with structural hardening, it is possible to carry out dissolution followed by quenching and tempering of the formed part and / or hot isostatic compression. The hot isostatic compression can in this case advantageously replace the dissolution. However, the method according to the invention is advantageous because it preferably does not require a solution treatment followed by quenching. Dissolution can have a detrimental effect on the mechanical resistance in certain cases by participating in a magnification of the dispersoids or of the fine intermetallic phases.
    Optionally, mechanical deformation of the part can be carried out at a stage in the manufacturing process, for example after additive manufacturing and / or before the heat treatment.
    Optional machining treatments and / or chemical, electrochemical or mechanical surface treatments and / or tribofinishing can be carried out in particular to reduce the roughness and / or improve the corrosion resistance and / or improve the resistance to crack propagation in tired.
    A second object of the invention is a metal part, obtained after application of a method according to the first object of the invention.
    Other advantages and characteristics will emerge more clearly from the description which follows and from nonlimiting examples, and represented in the figures listed below.
    Yet another object of the invention is a method of manufacturing a part comprising the formation of successive solid metal layers, superimposed on each other, to form a blank part, each layer describing a pattern defined from a model. digital, each layer being formed by the deposition of a metal, called filler metal, the filler metal being subjected to an energy supply so as to enter into fusion and to constitute, by solidifying, said layer, in which the filler metal takes the form of a powder, the exposure of which to an energy beam results in a fusion followed by a solidification so as to form a solid layer, the filler metal being an alloy of aluminum having an Mg content of less than 0.5% by weight, the method being characterized in that the blank has preferably a Knoop hardness of between 100 HK and 200 HK and in that the blank is then heat treated uement and / or undergoes hot isostatic compression at a temperature above 350 ° C so as to increase its Knoop hardness by at least 20 HK. In this embodiment, the alloy preferably has a composition according to the first subject of the invention.
    FIGURES
    FIG. 1 is a diagram illustrating an additive manufacturing method of the SLM or EBM type
    DETAILED DESCRIPTION OF THE INVENTION
    In the description, unless otherwise indicated:
    the designation of aluminum alloys conforms to the nomenclature established by The Aluminum Association;
    The contents of chemical elements are designated in% and represent mass fractions.
    The hardnesses are evaluated by the Knoop method for a load of 0.01 kg (10 g), either Knoop hardness 0.01 or Knoop hardness is indicated.
    FIG. 1 generally describes an embodiment, in which the additive manufacturing method according to the invention is implemented. According to this process, the filler material 25 is in the form of an alloy powder according to the invention. An energy source, for example a laser source or an electron source 31, emits an energy beam for example a laser beam or an electron beam 32. The energy source is coupled to the filler material by an optical or electromagnetic lens system 33, the movement of the beam can thus be determined as a function of a digital model M. The energy beam 32 follows a movement along the longitudinal plane XY, describing a pattern depending on the digital model. The powder 25 is deposited on a support 10. The interaction of the energy beam 32 with the powder 25 generates a selective melting of the latter, followed by solidification, resulting in the formation of a layer 20i ... 20 n . When a layer has been formed, it is covered with powder 25 of the filler metal and another layer is formed, superimposed on the layer previously produced. The thickness of the powder forming a layer may for example be between 10 and 100 μm. This additive manufacturing method is typically known under the name of selective laser melting (SLM) when the energy beam is a laser beam, the process being advantageously carried out at atmospheric pressure, and under the name of fusion by electron beam melting EBM when the energy beam is an electron beam, the process being advantageously carried out under reduced pressure, typically less than 0.01 bar and preferably less than 0.1 mbar.
    In another embodiment, the layer is obtained by selective laser sintering (selective laser sintering, SLS or direct metal laser sintering, DMLS), the layer of alloy powder according to the invention being selectively sintered according to the digital model with thermal energy from a laser beam.
    In yet another embodiment not described in FIG. 1, the powder is sprayed and melted by a generally laser beam simultaneously. Methods known in particular under the names direct energy deposition (Direct Energy Deposition, DED), Direct metal deposition (Direct Métal Déposition, DMD), Direct laser deposition (Direct Laser Deposition, DLD), Laser deposition technology ( Laser Deposition Technology, LDT), Laser Metal Deposition, Laser Engineering Net Shaping (LENS), Laser Plating Technology (Laser Cladding Technology, LCT), manufacturing of free forms by laser (Laser Freeform Manufacturing Technology, LFMT).
    In one embodiment, the method according to the invention is used for the production of a hybrid part comprising a part obtained by conventional methods of rolling and / or spinning and / or molding and / or forging optionally followed by machining and an integral part obtained additive manufacturing. This embodiment can also be suitable for repairing parts obtained by conventional methods.
    It is also possible in one embodiment of the invention to use the method according to the invention for the repair of parts obtained by additive manufacturing.
    At the end of the formation of the successive layers, a raw part or part in the raw manufacturing state is obtained.
    The metal parts obtained by the process according to the invention are particularly advantageous because they have smooth surfaces, do not exhibit hot cracking, have a hardness which is not too high in the raw state of manufacture but which can increase significantly by heat treatment. Advantageously, the hardness in the raw state of manufacture is less than the hardness after heat treatment and / or hot isostatic compression, the difference in hardness Knoop being at least 10 HK, preferably at least 20 HK, preferably in minus 30 HK and preferably at least 40 HK. Thus, unlike alloys according to the prior art such as alloy 8009, the Knoop hardness in the raw manufacturing state is preferably less than 300 HK and advantageously less than 200 HK, and preferably less than 150 HK. Advantageously, the Knoop hardness in the raw state of manufacture is at least 50 HK, advantageously at least 80 HK, and preferably less than 90 HK. In one embodiment of the invention, the Knoop hardness in the raw manufacturing state is between 100 HK and 200 HK. Preferably, the metal parts according to the invention are characterized, after a heat treatment of at least 100 ° C and at most 550 ° C and / or hot isostatic compression, by a Knoop hardness of at least 100 HK and preferably at least 120 HK or even at least 140 HK and preferably at least 150 HK and by the absence of hot cracking.
    The present inventor has found that a method of manufacturing a part comprising the formation of successive solid metal layers, superimposed on each other, to form a raw part, each layer describing a pattern defined from a digital model, each layer being formed by the deposition of a metal, called filler metal, the filler metal being subjected to a supply of energy so as to melt and to constitute, by solidifying, said layer, in which the filler metal takes the form of a powder, the exposure of which to an energy beam results in a fusion followed by solidification so as to form a solid layer, the filler metal being an aluminum alloy having an Mg content of less than 0.5% by weight, the method being characterized in that the blank is then heat treated and / or is subjected to hot isostatic compression at a temperature above 350 ° C. is to increase its Knoop hardness of at least 20 HK is particularly advantageous.
    EXAMPLE
    In this example we evaluated the properties of different alloys in an SLM machine.
    Disks of alloy 8009 or AS7G06 or of alloy according to the invention, of thickness 5 mm and diameter 27 mm, were prepared from small ingots. The discs were placed in an SLM machine and scans of the surface with a laser were performed with the same scanning strategy and process conditions representative of those used for the SLM process. The present inventor has in fact found that it was possible in this way to assess the suitability of the alloys for the SLM process and in particular the surface quality and the sensitivity to hot cracking.
    The composition of the alloys used is given in Table 1.
    Table 1. Composition of alloys in% by mass
    Alloy Yes Fe mn V Cr Zr mg Ti Invention 0.05 0.16 1.04.9 1.5 8009 1.8 8.7 0.23 1.3 AS7G06 * 7.00.6 0.2
    * nominal values
    In the following tests, the laser source had a power of 200 W, the width of a laser passage was 100 μm, with an overlap between two successive passages, the manufacturing temperature was 200 C. The scanning speed was 900 mm / s. We used an SLM machine
    Phoenix Systems PM100.
    The surface quality was assessed qualitatively according to the following scale, with rating 1 being the most favorable.
    1: very smooth surface without surface defects: smooth surface without surface defects: rough surface without surface defects: very rough surface with surface defects
    The sensitivity to hot cracks was evaluated on cross sections of the treated areas according to the following scale, the rating 1 being the most favorable.
    1. Absence of microcracks
    2. Presence of microcracks less than 50 µm
    3. Presence of microcracks over 50 µm
    The hardness was measured according to the Knoop scale with a load of 10 g after laser treatment and after an additional heat treatment at 400 ° C., making it possible in particular to assess the suitability of the alloy for hardening during a heat treatment and the effect of any CIC treatment on the mechanical properties.
    The results obtained are presented in Table 2.
    Table 2. Results obtained
    Alloy Surface dimension Hot cracking rating Knoop hardness (0.01) after laser treatment Knoop hardness (0.01) after additional 4h treatment at 400 ° C Invention 1 1 118 HK 162 HK 8009 4 3 360 HK 155 HK AS7G06 1 1 132HK 72HK
    The alloy according to the invention is particularly advantageous because it makes it possible to obtain a smooth surface, without hot cracking and with high hardness after treatment at 400 ° C.
    权利要求:
    Claims (11)
    [1" id="c-fr-0001]
    1. Method for manufacturing a part comprising the formation of successive solid metal layers (20i ... 20 n ), superimposed on each other, each layer describing a pattern defined from a digital model (M), each layer being formed by the deposition of a metal (25), said filler metal, the filler metal being subjected to a supply of energy] so as to enter into fusion and to constitute, by solidifying, said layer , in which the filler metal takes the form of a powder (25), the exposure of which to an energy beam (32) results in a fusion followed by solidification so as to form a solid layer (20i .. .20 n ),] the method being characterized in that the filler metal (25) is an] aluminum alloy comprising at least the following alloying elements:
    Cr, according to a mass fraction of between 2% and 10%;
    Zr, according to a mass fraction of between 0.5% and 5%.
    [2" id="c-fr-0002]
    2. Method according to claim 1, in which the aluminum alloy comprises at least one of the following elements:
    Mn, according to a mass fraction between 0.06% and 6%, preferably at most 3% and preferably at most 2%;
    Ti, according to a mass fraction of between 0.01% and 5%, preferably at least 0.1%, preferably at most 3%, preferably at least 2% and preferably at least plus 1%;
    V, according to a mass fraction of between 0.06% and 6%, preferably at most 3%, preferably at most 2% and preferably at most 1%;
    [3" id="c-fr-0003]
    3. Method according to any one of the preceding claims, in which the aluminum alloy comprises at least one of the following elements:
    Ag, according to a mass fraction of between 0.06 and 1%;
    Li, according to a mass fraction of between 0.06 and 1%;
    Cu, according to a mass fraction of between 0.06 and 5%, the Cu content being less than the Cr content and preferably between 0.1 and 1%;
    Zn, according to a mass fraction of between 0.06 and 1%.
    [4" id="c-fr-0004]
    4. Method according to any one of the preceding claims, in which the aluminum alloy also comprises at least one of the following elements
    Sc, Hf, W, Nb, Ta, Y, Yb, Nd, Er, Co, Ni with a mass fraction of at least 0.06% and at most 5% preferably at most 3%, preferably at most 2% and preferably at most 1%, so as to form more dispersoids or fine intermetallic phases.
    [5" id="c-fr-0005]
    5. Method according to any one of the preceding claims, in which the aluminum alloy also comprises at least one of the following elements
    La, Ce or mischmetal, with a mass fraction of at least 0.06% and at most 6%, preferably at most 3%, preferably at most 2% and preferably at most 1%.
    [6" id="c-fr-0006]
    6. Method according to any one of the preceding claims, in which the aluminum alloy also comprises at least one of the following elements
    Bi, Sr, Sn, Ba, Ca, Sb, P and B, with a mass fraction of at least 0.01% and at most 1% and preferably at least 0.06% and at least plus 0.8%.
    [7" id="c-fr-0007]
    7. Method according to any one of the preceding claims, in which the aluminum alloy also comprises the element Mg according to a mass fraction of at least 0.06% and at most Q, 5%.
    [8" id="c-fr-0008]
    8. Method according to any one of the preceding claims, in which the aluminum alloy also comprises Fe and / or Si according to a mass fraction of at least 0.06% and at most 1% each, and preferably at least 0.1% and at most 2% each, and preferably at least 0.5% and at most 1% each.
    [9" id="c-fr-0009]
    9. Method according to any one of the preceding claims, comprising, following the formation of layers (20i ... 20 n ), a heat treatment typically at a temperature of at least 100 ° C and at most 550 ° C, and / or hot isostatic compression.
    [10" id="c-fr-0010]
    10. Metal part (20) obtained by a process which is the subject of any one of the preceding claims.
    [11" id="c-fr-0011]
    11. Method according to claim 1, characterized in that the filler metal is an aluminum alloy further having an Mg content of less than 0.5% by weight) and characterized in that the blank preferably has a Knoop hardness between entrellOO HK and 200 HK and in that it is then heat treated and / or undergoes isostatic compression at
    10 hot at a temperature above 350 ° C so as to increase its Knoop hardness by at least
    20 HK.
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    CN112251650A|2020-09-30|2021-01-22|福建祥鑫股份有限公司|Aluminum alloy and preparation method thereof|
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    法律状态:
    2019-02-25| PLFP| Fee payment|Year of fee payment: 2 |
    2019-08-09| PLSC| Publication of the preliminary search report|Effective date: 20190809 |
    2020-02-25| PLFP| Fee payment|Year of fee payment: 3 |
    2021-02-23| PLFP| Fee payment|Year of fee payment: 4 |
    2022-02-23| PLFP| Fee payment|Year of fee payment: 5 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1870138|2018-02-08|
    FR1870138A|FR3077524B1|2018-02-08|2018-02-08|METHOD OF MANUFACTURING A PART FROM ALUMINUM AND CHROME ALLOY|FR1870138A| FR3077524B1|2018-02-08|2018-02-08|METHOD OF MANUFACTURING A PART FROM ALUMINUM AND CHROME ALLOY|
    CN201980012654.7A| CN111699063A|2018-02-08|2019-02-07|Method for manufacturing aluminium-chromium alloy parts|
    JP2020542998A| JP2021514423A|2018-02-08|2019-02-07|Manufacturing method of aluminum / chrome alloy parts|
    EP19710039.9A| EP3749471A1|2018-02-08|2019-02-07|Process for manufacturing an aluminum-chromium alloy part|
    DE19710039.9T| DE19710039T1|2018-02-08|2019-02-07|Process for producing a part from aluminum-chrome alloy|
    PCT/FR2019/050269| WO2019155165A1|2018-02-08|2019-02-07|Process for manufacturing an aluminum-chromium alloy part|
    US16/968,048| US20210032727A1|2018-02-08|2019-02-07|Process for manufacturing an aluminum-chromium alloy part|
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