US20230357889A1 - Method For Manufacturing Aluminum Alloy Extruded Material - Google Patents

Method For Manufacturing Aluminum Alloy Extruded Material Download PDF

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Publication number
US20230357889A1
US20230357889A1 US18/351,826 US202318351826A US2023357889A1 US 20230357889 A1 US20230357889 A1 US 20230357889A1 US 202318351826 A US202318351826 A US 202318351826A US 2023357889 A1 US2023357889 A1 US 2023357889A1
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United States
Prior art keywords
extruded material
aluminum alloy
less
aluminum
extruded
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US18/351,826
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English (en)
Inventor
Karin SHIBATA
Hiroaki Matsui
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Aisin Keikinzoku Co Ltd
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Aisin Keikinzoku Co Ltd
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Assigned to AISIN KEIKINZOKU CO., LTD. reassignment AISIN KEIKINZOKU CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: MATSUI, HIROAKI, Shibata, Karin
Publication of US20230357889A1 publication Critical patent/US20230357889A1/en
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B21/00—Obtaining aluminium
    • C22B21/0084—Obtaining aluminium melting and handling molten aluminium
    • C22B21/0092—Remelting scrap, skimmings or any secondary source aluminium
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C23/00—Extruding metal; Impact extrusion
    • B21C23/002—Extruding materials of special alloys so far as the composition of the alloy requires or permits special extruding methods of sequences
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C21/00—Alloys based on aluminium
    • C22C21/10—Alloys based on aluminium with zinc as the next major constituent
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
    • C22F1/053—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon of alloys with zinc as the next major constituent

Definitions

  • the present disclosure relates to a method for manufacturing an extruded material using an Al—Zn—Mg-based aluminum alloy, and in particular, can effectively utilize a recycled aluminum material.
  • Al—Mg—Si-based 6000 series aluminum alloys In high-strength aluminum alloys that are used for extruded materials, Al—Mg—Si-based 6000 series aluminum alloys, and Al—Zn—Mg-based 7000 series aluminum alloys are mainly known.
  • Si and Fe components are easily mixed in as impurities.
  • JP-B-2928445 discloses a high-strength aluminum alloy extruded material containing 5.0 to 7.0 wt % of Zn, 1.0 to 1.50 wt % of Mg, 0.1 to 0.3 wt % of Cu, 0.05 to 0.20 wt % of Zr, 0.03 to 0.2 wt % of Cr, 0.3 wt % or less of Mn, and 0.001 to 0.05 wt % of Ti, and a balance including Al and unavoidable impurities.
  • Si and Fe are also dealt as impurities, and looking at the example, Si is suppressed to 0.1 wt % or less, and Fe is suppressed to a level of 0.21 wt % or less.
  • FIG. 1 illustrates compositions of aluminum alloys used for evaluation.
  • FIG. 2 illustrates billet casting and extrusion conditions.
  • FIG. 3 illustrates evaluation results of extruded materials.
  • first element is described as being “connected” or “coupled” to a second element, such description includes embodiments in which the first and second elements are directly connected or coupled to each other, and also includes embodiments in which the first and second elements are indirectly connected or coupled to each other with one or more other intervening elements in between.
  • the disclosure has an object to provide a method for manufacturing an aluminum alloy extruded material that can increase an allowable range of impurities Si and Fe and obtain high strength so as to enable use of recycled aluminum materials.
  • a method for manufacturing an aluminum alloy extruded material according to the disclosure is a method for manufacturing an aluminum alloy extruded material using an aluminum alloy containing 20 to 95% by mass of a recycled aluminum material made by collecting and remelting extruded materials of aluminum alloys that are used or scrap materials generated in a manufacturing process, containing by mass: 6.0 to 8.0% of Zn, 1.0 to 2.0% of Mg, 0.10 to 0.50% of Cu, 0.10 to 0.25% of Zr, and 0.005 to 0.05% of Ti, with 0.30% or less of Si and 0.40% or less of Fe as impurities, and a balance being Al, including cooling an extruded material at a cooling rate of 50 to 750° C./min from an extruded material temperature of 325 to 550° C. directly after extrusion, and thereafter performing a two-stage artificial aging treatment at 90 to 130° C. for 1 to 8 hours and at 130 to 180° C. for 1 to 20 hours.
  • the recycled aluminum material is remelted, and by adding a virgin material to this, component adjustment for the molten metal is performed.
  • Mn 0.35% or less
  • Sr 0.25% or less
  • the disclosure is capable of quench hardening at the cooling rate of an air-cooling level directly after extruding while increasing the allowable range of the mixing amount of Si and Fe as impurities to by mass: 0.30% or less of Si and 0.40% or less of Fe to enhance the usage ratio of the recycled aluminum material, and the composition of the aluminum alloy that is set to secure SCC resistance with high strength will be described below.
  • a Zn component In a 7000 series aluminum alloy, a Zn component has the highest content, since there is little decrease in extrudability even at a relatively high concentration of Zn.
  • An Mg component is an important additive component along with Zn because high strength is obtained by precipitates of MgZn 2 with the Zn component, but as the addition amount increases, the extrudability deteriorates and bending formability also deteriorates, so that a range of 1.0 to 2.0% by mass of Mg is preferable.
  • a Cu component improves the strength by solid solution, and has an action of lowering the potential difference with a PF zone by existing together with MgZn 2 in the crystal grain boundary of the metal texture, thereby improving the SCC resistance.
  • the PF zone refers to regions (Precipitate-Free-Zone) without precipitates observed on both sides of the grain boundary.
  • Zr, Mn and Cr components are all transition elements that have an action of suppressing the depth of the recrystallized layer formed on the surface of the extruded material at the time of extrusion, and an effect of refining crystal grains, and improve the SCC resistance.
  • the Cr component makes the quench hardening sensitivity the sharpest, and the required high strength cannot be obtained without high-speed cooling at a water-cooling level in die edge quench hardening.
  • the Mn component sharpens the quench hardening sensitivity next, and the Zr component is the least sensitive to quench hardening, so that in the disclosure, adjustment is made by addition of Zr and Mn, and the Cr component is reduced as much as possible.
  • the Sr component has a great effect on the crystal structure when casting billets, and adding a very small amount of the Sr component suppresses coarsening of crystal grains and suppresses recrystallization on the surface of the extruded material during extrusion.
  • a Ti component is effective in refining crystal grains during billet casting, and Ti is preferably in a range of 0.005 to 0.05% by mass.
  • a billet for extrusion is generally continuously cast as a long cylindrical billet.
  • various methods such as a hot top casting method and a float type casting method are performed, and in either case, the aluminum alloy is casted into a long cylindrical billet by being cooled from a periphery at a bottom part of a casting mold or a lower side of the casting mold and being solidified.
  • the billet used in the disclosure preferably has a casting structure of a fine structure composed of fine crystal grains, and a casting rate at which it is cooled and solidified, and cast on the lower side of the casting mold is preferably 50 mm/min or higher, and as a result, the fine structure of the billet preferably becomes a casting structure with an average grain size of 250 ⁇ m or less, more preferably 200 ⁇ m or less.
  • An extruder has a container with an extrusion die attached to a front side, a cylindrical billet is loaded into the container, and is hot-extruded from behind by a stem or the like.
  • the billet is loaded into the container in a state in which the billet is preheated to 400° C. or higher, preferably 430 to 510° C., and extruded.
  • the extruded material extruded by hot working also has a high temperature due to heat of working, but it is preferable to secure 440° C. or higher in order to sufficiently perform subsequent quench hardening, and at least 325° C. or higher is required at a time of start of cooling by air cooling.
  • die edge quench hardening by air cooling is performed.
  • the cooling rate in a range of 50 to 750° C./min is secured by fan air cooling or the like.
  • An extruded material made of a 7000 series aluminum alloy can obtain high strength by precipitating G. P. zones and intermediate phases in the crystal structure of the extruded material, and a two-stage artificial aging treatment is performed at 90 to 130° C. for 1 to 8 hours for a first stage, and at 130 to 180° C. for 1 to 20 hours for a second stage.
  • the usage amount of recycled material can be increased, and extruded materials with high strength and excellent in SCC resistance can be obtained.
  • compositions of various aluminum alloys were adjusted, and cylindrical billets with a diameter of 8 inches were experimentally produced and evaluated while examining extrusion conditions, as will be described below.
  • BLT temperature indicates a preheating temperature when the billet is loaded into a container of an extruder
  • profile temperature after extrusion indicates a surface temperature of an extruded material directly after extrusion
  • profile temperature at the start of cooling indicates a surface temperature of the extruded material at a start of die edge quench hardening and a cooling rate by fan air cooling.
  • heat treatment conditions indicate the conditions and a treatment time period of artificial aging treatment.
  • Evaluation results are shown in a table of FIG. 3 .
  • T5 tensile strength”, “T5 yield strength”, and “T5 elongation” in the table were measured by cutting out JIS-Z2241 and JIS-5 test pieces in an extruding direction from the extruded materials subjected to the two-stage artificial aging treatment by a tensile tester conforming to JIS standards.
  • test pieces were immersed into a 3.5% NaCl aqueous solution at 25° C., for 10 minutes, the test pieces were held in an atmosphere of 25° C. and 40% humidity for 50 minutes, and thereafter taken out from a test furnace to dry naturally.
  • the recycled aluminum material was 100%, so that the Si content was not able to be suppressed to 0.30% or less, the Fe content was not able to be suppressed to 0.40% or less, and the SCC resistance did not reach the target.
  • aluminum alloy extruded materials having a high strength and excellent in SCC resistance can be obtained while recycled aluminum materials are effectively utilized, and the aluminum alloy extruded materials can be used for structure members of vehicles and various machines.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Extrusion Of Metal (AREA)
US18/351,826 2021-02-25 2023-07-13 Method For Manufacturing Aluminum Alloy Extruded Material Pending US20230357889A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2021-028184 2021-02-25
JP2021028184 2021-02-25
PCT/JP2022/004678 WO2022181307A1 (ja) 2021-02-25 2022-02-07 アルミニウム合金押出材の製造方法

Related Parent Applications (1)

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PCT/JP2022/004678 Continuation WO2022181307A1 (ja) 2021-02-25 2022-02-07 アルミニウム合金押出材の製造方法

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US (1) US20230357889A1 (de)
JP (1) JPWO2022181307A1 (de)
CN (1) CN116761904A (de)
DE (1) DE112022001208T5 (de)
WO (1) WO2022181307A1 (de)

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WO2023233713A1 (ja) * 2022-05-30 2023-12-07 アイシン軽金属株式会社 耐ｓｃｃ性に優れる高強度アルミニウム合金押出材の製造方法

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JP2928445B2 (ja) 1993-08-31 1999-08-03 株式会社神戸製鋼所 高強度アルミニウム合金押出材及びその製造方法
JP2006316295A (ja) * 2005-05-10 2006-11-24 Furukawa Sky Kk 高温成形用アルミニウム合金押出材およびその高温成形品
JP7018274B2 (ja) * 2017-08-25 2022-02-10 アイシン軽金属株式会社 押出成形用のアルミニウム合金及びそれを用いた押出材の製造方法
JP7479854B2 (ja) * 2019-02-22 2024-05-09 アイシン軽金属株式会社 アルミニウム合金押出材の製造方法
JP6672503B1 (ja) * 2019-03-28 2020-03-25 株式会社神戸製鋼所 アルミニウム合金押出材からなる自動車のドアビーム

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CN116761904A (zh) 2023-09-15
DE112022001208T5 (de) 2024-01-11
WO2022181307A1 (ja) 2022-09-01

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