EP0845542A1 - Procédé de fabrication de produits semi-finis en aluminium - Google Patents

Procédé de fabrication de produits semi-finis en aluminium Download PDF

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Publication number
EP0845542A1
EP0845542A1 EP97110712A EP97110712A EP0845542A1 EP 0845542 A1 EP0845542 A1 EP 0845542A1 EP 97110712 A EP97110712 A EP 97110712A EP 97110712 A EP97110712 A EP 97110712A EP 0845542 A1 EP0845542 A1 EP 0845542A1
Authority
EP
European Patent Office
Prior art keywords
semi
melt
less
alloy
grain size
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
Application number
EP97110712A
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German (de)
English (en)
Other versions
EP0845542B1 (fr
Inventor
Otto W. Dr.-Ing. Stenzel
Herbert Dr.-Ing. Möding
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
KS Huayu Alutech GmbH
Original Assignee
KS Aluminium Technologie GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by KS Aluminium Technologie GmbH filed Critical KS Aluminium Technologie GmbH
Publication of EP0845542A1 publication Critical patent/EP0845542A1/fr
Application granted granted Critical
Publication of EP0845542B1 publication Critical patent/EP0845542B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D21/00—Casting non-ferrous metals or metallic compounds so far as their metallurgical properties are of importance for the casting procedure; Selection of compositions therefor
    • B22D21/002—Castings of light metals
    • B22D21/007—Castings of light metals with low melting point, e.g. Al 659 degrees C, Mg 650 degrees C

Definitions

  • the present invention relates to a method for Manufacture of workpieces or semi-finished products from one low wear aluminum alloy with intermetallic Phase forming additives.
  • Precipitation crystals have a grain size of significantly less than 80 ⁇ m, in the preferred case less than 20 ⁇ m.
  • the present invention is therefore based on the object to create a method of the type described above with which also makes thick-walled, voluminous workpieces or semi-finished products a low-wear aluminum alloy in the casting process can be produced that are of high quality.
  • the process is also intended to manufacture semi-finished products enable themselves in a subsequent forming process Have workpieces formed without having to Inhomogeneities the positive properties of the cast material get lost.
  • This task is carried out in a method of the type mentioned solved according to the invention in that in a first step a melt of the alloy in such a small dimension is shed that such a high cooling rate is achieved that the precipitating crystals that form of the intermetallic phases homogeneously distributed and with defined grain size are excreted from the melt; that the primary material obtained in the first step Temperatures in the area of the heterogeneous area between Aluminum melt and intermetallic phase heated and that Aluminum is melted so far that the alloy is under Gravity is fluid and then that one Workpiece or a semi-finished product with compared to the dimension of the Primary material of larger dimensions is created.
  • the melt becomes very high according to the invention cooled quickly so that a homogeneous distribution of the excreting intermetallic phases or Precipitation crystals is reached. While due to Diffusion processes with very slow solidification processes inside a thick-walled casting Precipitation crystals measuring 80 ⁇ m and above can have, according to the invention by rapid Cooling down a fine-grained homogeneous distribution of the Precipitation crystals "frozen". This is according to the Invention achieved in that the melt in the first Step is shed with a small dimension, which in Depends on the available cooling capacity is less than 50 mm, preferably less than 20 mm.
  • the melt can be technically realized in a continuous casting "finger thick" or in pigs or tapes, especially also be cast on a casting wheel.
  • the grain size should be less than 80 ⁇ m, preferably less than 40 ⁇ m and particularly are preferably less than 20 microns.
  • the best Results are achieved when the dimension or Cooling rate is so high that grain sizes of less than 5 ⁇ m result.
  • intermetallic phases are preferably aluminides, but in principle it could also be compounds of the alloying elements.
  • the alloying elements for forming aluminides as intermetallic phases are preferably titanium and zircon which crystallize out to form Al 3 Ti and Al 3 Zr. If titanium is added, the remelting temperature in the second step of the method according to the invention is about 800 ° Celsius.
  • the aluminum matrix is already liquid again, but the titanium aluminide, Al 3 Ti, with a melting point of 1460 ° Celsius is still solid. Due to the low solubility of the Al 3 Ti in the aluminum melt of about 0.4%, the precipitation crystals are largely preserved and are not dissolved.
  • the temperature to which the starting material is reheated in the second step of the process according to the invention must be kept well below the melting temperature of the intermetallic phase in question, but on the other hand it must be so high that a sufficient proportion of melt for the subsequent shaping into the desired dimensions is available.
  • the subsequent shaping or reshaping can be done by simple gravity casting but also in pressure or centrifugal casting.
  • the semi-finished products with larger dimensions produced in this way are particularly suitable for forming, for example, in the extrusion process, forging, rolling or tixocasting, since the fine-grained, hard precipitation crystals are not destroyed during the forming processes and the wear-reducing phases are evenly distributed.
  • Additives such as copper, magnesium, manganese can be added be used, which is the matrix hardness of the alloy increase. It can also prove advantageous if other hard crystals, e.g. Silicon into which Aluminum matrix can be stored.
  • the micrograph according to FIG. 1 shows a fine-grained, homogeneous structure of a low-wear aluminum alloy, titanium and other additives increasing the matrix hardness being added.
  • the dark phases represent precipitation crystals.
  • a strand in the order of magnitude of approx. 20 mm diameter was cast and thereby solidified so quickly that precipitation crystals in the form of titanium aluminide, Al 3 Ti, homogeneously distributed with a dimension of less than 80 microns.
  • the desired grain size is set via the strand dimensions and the heat dissipation conditions.
  • the approximately "finger-thick" continuous casting is then brought back to a temperature of approximately 800 ° Celsius in a second process step, at which the aluminum matrix of the primary material is at least partially melted, so that a sufficient amount of melt for molding or casting a workpiece is compared the dimension of the finger-thick strand of the primary material of larger dimensions or for casting a semi-finished product, such as a thick rug, for a subsequent extrusion process.
  • the remelting temperature in the second step of the process is clearly below the melting temperature of the titanium aluminide and, furthermore, the solubility of the titanium aluminide in the aluminum melt at the remelting temperature is only 0.4%, the fine-grained precipitates of the titanium aluminide are largely retained and also characterize the structure of the final workpiece or semi-finished product.
EP97110712A 1996-11-27 1997-07-01 Procédé de fabrication de produits semi-finis en aluminium Expired - Lifetime EP0845542B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19649015 1996-11-27
DE19649015A DE19649015A1 (de) 1996-11-27 1996-11-27 Verfahren zur Herstellung von Aluminium Halbzeugen

Publications (2)

Publication Number Publication Date
EP0845542A1 true EP0845542A1 (fr) 1998-06-03
EP0845542B1 EP0845542B1 (fr) 2002-09-25

Family

ID=7812854

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97110712A Expired - Lifetime EP0845542B1 (fr) 1996-11-27 1997-07-01 Procédé de fabrication de produits semi-finis en aluminium

Country Status (2)

Country Link
EP (1) EP0845542B1 (fr)
DE (2) DE19649015A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4711823A (en) * 1984-11-12 1987-12-08 Honda Giken Kogyo Kabushiki Kaisha High strength structural member made of Al-alloy
JPH05148563A (ja) * 1991-07-30 1993-06-15 Nippon Steel Corp 電解コンデンサ電極用材料の製造方法
JPH07258770A (ja) * 1994-03-18 1995-10-09 Suzuki Motor Corp アルミニウム合金とその製造方法

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5669346A (en) * 1979-11-07 1981-06-10 Showa Alum Ind Kk Aluminum alloy for working and its manufacture
IT1229029B (it) * 1989-04-14 1991-07-12 Polvara Maria Crosti Giovanni Processo per la produzione di leghe di alluminio colate allo stato semiliquido, nonche' impianto per la sua attuazione.
GB2243620B (en) * 1990-03-27 1994-06-29 Atsugi Unisia Corp Improvements in and relating to forming aluminium-silicon alloy
DE4321640C2 (de) * 1993-06-30 1998-08-06 Siemens Ag Verfahren zum gerichteten Erstarren einer Metallschmelze und Gießvorrichtung zu seiner Durchführung
JPH07109536A (ja) * 1993-10-12 1995-04-25 Nippon Light Metal Co Ltd 鍛造用アルミニウム合金及びその熱処理

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4711823A (en) * 1984-11-12 1987-12-08 Honda Giken Kogyo Kabushiki Kaisha High strength structural member made of Al-alloy
JPH05148563A (ja) * 1991-07-30 1993-06-15 Nippon Steel Corp 電解コンデンサ電極用材料の製造方法
JPH07258770A (ja) * 1994-03-18 1995-10-09 Suzuki Motor Corp アルミニウム合金とその製造方法

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
DATABASE WPI Section Ch Week 9328, Derwent World Patents Index; Class L03, AN 93-224527, XP002057693 *
DATABASE WPI Section Ch Week 9549, Derwent World Patents Index; Class M22, AN 95-380414, XP002057694 *

Also Published As

Publication number Publication date
EP0845542B1 (fr) 2002-09-25
DE59708317D1 (de) 2002-10-31
DE19649015A1 (de) 1998-05-28

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