EP0092492A1 - Procédé de fabrication de pièces matricées ou forgées en alliage d'aluminium - Google Patents

Procédé de fabrication de pièces matricées ou forgées en alliage d'aluminium Download PDF

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Publication number
EP0092492A1
EP0092492A1 EP83420063A EP83420063A EP0092492A1 EP 0092492 A1 EP0092492 A1 EP 0092492A1 EP 83420063 A EP83420063 A EP 83420063A EP 83420063 A EP83420063 A EP 83420063A EP 0092492 A1 EP0092492 A1 EP 0092492A1
Authority
EP
European Patent Office
Prior art keywords
temperature
alloy
quenching
speed
forged
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.)
Withdrawn
Application number
EP83420063A
Other languages
German (de)
English (en)
French (fr)
Inventor
Roger Develay
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.)
Cegedur Societe de Transformation de lAluminium Pechiney SA
Original Assignee
Cegedur Societe de Transformation de lAluminium Pechiney SA
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 Cegedur Societe de Transformation de lAluminium Pechiney SA filed Critical Cegedur Societe de Transformation de lAluminium Pechiney SA
Publication of EP0092492A1 publication Critical patent/EP0092492A1/fr
Withdrawn legal-status Critical Current

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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
    • 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
    • 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
    • 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
    • C22F1/057—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 copper as the next major constituent

Definitions

  • the invention relates to a process for manufacturing die-forged or forged parts of aluminum alloys with structural hardening and high resistance, in particular those corresponding to the 2000, 6000 and 7000 series of the Aluminum Association, the load of which rupture (R) in the treated state is greater than or equal to 280 MPa.
  • the method is substantially identical except that the reheating before deformation takes place at temperatures T 3 and for times usually used for setting conventional solution before quenching (instead of temperature T 1 ).
  • the temperature T 1 is the usual temperature for homogenization of the alloys considered.
  • the duration of the maintenance at this temperature must be sufficient to allow the main alloying elements to be dissolved.
  • the temperature T 2 is the temperature at which the start of shaping takes place. This temperature is chosen so that the alloy considered has sufficient plasticity or formability for obtaining the part to be produced. During the deformation, this temperature can also change as a function of, the extent of this deformation, the speed of deformation, the temperature of the tools and the nature of the alloy and reach the value T ′ 2 .
  • the temperature T 3 is the solution dissolution temperature of the alloy; for example, a list can be found in the work of VAN HORN already cited, p. 332 and following.
  • the accelerated cooling between T 1 (or T 3 ) and T 2 is preferably obtained by cooling the piece by forced air or a mist.
  • the average cooling rate between the homogenization temperature T 1 or the dissolution solution T 3 and the ambient temperature must be sufficient (higher than the critical quenching speed) to ensure good characteristics of the part. final.
  • critical quenching speed which essentially depends on the composition of the alloy and its microstructure, in particular in the critical quenching interval, also variable depending on the nature of the alloy; this critical interval is generally between the solution temperature and a temperature close to 200-250 ° C and is particularly between 400 and 290 ° C.
  • the critical quenching rate can be defined as the average cooling rate which must be exceeded within the critical range to avoid coarse precipitation, detrimental to the final characteristics.
  • the average speed of cooling of the part between the end of the hot deformation (T ' 2 ) and the ambient (in practice 200 ° C) must be higher than the critical quenching speed of the alloy, and this in particular in the critical quenching interval. This condition of cooling makes it possible to avoid the decomposition of the solid solution and, consequently, the precipitation of the hardening compounds, precipitation which can prove to be detrimental for the characteristics of the product and, in particular, the mechanical strength and the resistance to corrosion.
  • the cooling cycle can be defined by using the TTP curves (time, temperature, properties). These curves, characteristic of a given alloy, have a C shape. It is then necessary that the curve which gives the product cooling cycle is always located to the left of the nose (s) of the curve (s) (s) TTP relating to the property (ies) considered.
  • the critical quenching speed of aluminum alloys depends on the nature of the alloy, its microstructure, but also on the final property considered. For example, for alloys of the 2000 and 7000 series with copper, the critical quenching speed is between 20 ° C and 100 ° C / s if we only consider the mechanical tensile characteristics, but it can exceed 100 ° C / s if we consider the resistance to intergranular corrosion (for example 150 ° C / s for the alloy 7075 T6 and 500 ° C / s for the alloy 2024 T4). For 7000 alloys, without copper, the critical quenching speed is much lower (0.5 to 1 ° C / s for alloy 7020, for example). For 6000 alloys, the critical quenching rate varies between 1 and 10 ° C / s (for example 1 ° C / s for alloy 6063 and 10 ° C / s for alloy 6061).
  • FIG. 1 schematically represents the conventional transformation range according to the prior art, of pieces cast from point (1) - cycle A - or of homogenized and precorroyed pieces from point (1 ') - cycle B -, steps are listed in the first part of the description (see page 1).
  • FIG. 2a schematically represents the production range according to the invention, from castings of plastics - cycle C - and FIG. 2b, of homogenized and precorroyed plots - cycle D -.
  • FIG. 3 represents the position of two manufacturing cycles (C 1 and C 2 ) with respect to the TTP curves (10 or 11).
  • the average quenching speed was greater than the critical quenching speed of the alloy which is of the order of 10 ° C / second.
  • the average cooling rate between 450 ° C and 250 ° C was greater than 20 ° C / second.
  • cycle D After cutting off plots of volumes capable of transformation into rods, cycle D was applied, namely:

Landscapes

  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Forging (AREA)
  • Heat Treatment Of Nonferrous Metals Or Alloys (AREA)
  • Heat Treatment Of Articles (AREA)
EP83420063A 1982-04-13 1983-04-11 Procédé de fabrication de pièces matricées ou forgées en alliage d'aluminium Withdrawn EP0092492A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8206705 1982-04-13
FR8206705A FR2524908A1 (fr) 1982-04-13 1982-04-13 Procede de fabrication de pieces matricees ou forgees en alliage d'aluminium

Publications (1)

Publication Number Publication Date
EP0092492A1 true EP0092492A1 (fr) 1983-10-26

Family

ID=9273142

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83420063A Withdrawn EP0092492A1 (fr) 1982-04-13 1983-04-11 Procédé de fabrication de pièces matricées ou forgées en alliage d'aluminium

Country Status (5)

Country Link
US (1) US4490189A (US20030199744A1-20031023-C00003.png)
EP (1) EP0092492A1 (US20030199744A1-20031023-C00003.png)
JP (1) JPS58204164A (US20030199744A1-20031023-C00003.png)
ES (1) ES8402360A1 (US20030199744A1-20031023-C00003.png)
FR (1) FR2524908A1 (US20030199744A1-20031023-C00003.png)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2661232B2 (ja) * 1989-01-12 1997-10-08 日産自動車株式会社 アルミニウム系熱間鍛造品の製造方法
FR2726007B1 (fr) * 1994-10-25 1996-12-13 Pechiney Rhenalu Procede de fabrication de produits en alliage alsimgcu a resistance amelioree a la corrosion intercristalline
US6630037B1 (en) 1998-08-25 2003-10-07 Kobe Steel, Ltd. High strength aluminum alloy forgings
EP1229141A1 (de) * 2001-02-05 2002-08-07 ALUMINIUM RHEINFELDEN GmbH Aluminiumgusslegierung
US20060000094A1 (en) * 2004-07-01 2006-01-05 Garesche Carl E Forged aluminum vehicle wheel and associated method of manufacture and alloy
US8663405B2 (en) * 2011-01-24 2014-03-04 GM Global Technology Operations LLC Stamping of age-hardenable aluminum alloy sheets
WO2016027209A1 (en) 2014-08-18 2016-02-25 Bharat Forge Limited A forging process for manufacture of aluminium alloy wheel disc
CN112359254A (zh) * 2020-11-24 2021-02-12 辽宁忠旺集团有限公司 一种具有高强度高塑性的铝合金防撞横梁生产工艺
CN113444941A (zh) * 2021-06-18 2021-09-28 天津忠旺铝业有限公司 一种提高2024-t3板材强度的方法

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2262696A (en) * 1939-10-21 1941-11-11 Aluminum Co Of America Method of treating aluminum alloys
GB780570A (en) * 1955-04-06 1957-08-07 Oesterreichische Metallwerke A Method of making sheet or strip of aluminium or aluminium alloys
US3180806A (en) * 1961-07-03 1965-04-27 Aluminum Co Of America Surface treatment of aluminum base alloys and resulting product
FR2027699A1 (US20030199744A1-20031023-C00003.png) * 1969-01-03 1970-10-02 Olin Corp

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3234054A (en) * 1964-08-05 1966-02-08 Olin Mathieson Process for preparing aluminum base alloy
US3418177A (en) * 1965-10-14 1968-12-24 Olin Mathieson Process for preparing aluminum base alloys
US3642542A (en) * 1970-02-25 1972-02-15 Olin Corp A process for preparing aluminum base alloys
US4019931A (en) * 1976-03-04 1977-04-26 Swiss Aluminium Ltd. Thread plate process
JPS52144359A (en) * 1976-05-28 1977-12-01 Nitsukaru Oshidashi Kk Aluminum alloy dies material manufacturing

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2262696A (en) * 1939-10-21 1941-11-11 Aluminum Co Of America Method of treating aluminum alloys
GB780570A (en) * 1955-04-06 1957-08-07 Oesterreichische Metallwerke A Method of making sheet or strip of aluminium or aluminium alloys
US3180806A (en) * 1961-07-03 1965-04-27 Aluminum Co Of America Surface treatment of aluminum base alloys and resulting product
FR2027699A1 (US20030199744A1-20031023-C00003.png) * 1969-01-03 1970-10-02 Olin Corp

Also Published As

Publication number Publication date
JPS58204164A (ja) 1983-11-28
FR2524908A1 (fr) 1983-10-14
ES521384A0 (es) 1984-01-16
FR2524908B1 (US20030199744A1-20031023-C00003.png) 1984-07-20
US4490189A (en) 1984-12-25
ES8402360A1 (es) 1984-01-16

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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17P Request for examination filed

Effective date: 19840224

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Inventor name: DEVELAY, ROGER