EP0051549B1 - Méthode de trempe interrompue des alliages à base d'aluminium - Google Patents

Méthode de trempe interrompue des alliages à base d'aluminium Download PDF

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Publication number
EP0051549B1
EP0051549B1 EP81420167A EP81420167A EP0051549B1 EP 0051549 B1 EP0051549 B1 EP 0051549B1 EP 81420167 A EP81420167 A EP 81420167A EP 81420167 A EP81420167 A EP 81420167A EP 0051549 B1 EP0051549 B1 EP 0051549B1
Authority
EP
European Patent Office
Prior art keywords
temperature
process according
cooling
temperatures
quenching
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.)
Expired
Application number
EP81420167A
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German (de)
English (en)
French (fr)
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EP0051549A1 (fr
Inventor
Daniel Ferton
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
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Publication date
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Publication of EP0051549A1 publication Critical patent/EP0051549A1/fr
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    • 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 method of interrupted quenching of aluminum alloys with structural hardening.
  • over-tempering techniques double tempering, on alloys of the 7000 series. These techniques produce a significant drop in mechanical strength properties.
  • the treatment is possibly supplemented by the conventional operations of traction or controlled compression (stockholding) and / or tempering (hardening).
  • the quenching is carried out by (or in) an appropriate fluid, preferably with cold water, by any known means (spraying, immersion, spraying, air-water spray, etc.).
  • the products thus treated have, compared to conventional direct quenching treatments, good resistance to corrosion, in particular to corrosion under stress, at the cost, possibly, of a slight decrease in the mechanical tensile characteristics. On the other hand, the level of residual stresses after quenching is greatly reduced.
  • Stopping of the quenching is obtained by closing the watering inlets in the case of quenching by spraying, or by emersion of the product out of the quenching bath, in the case of quenching by immersion.
  • this method is distinguished by an interruption and a resumption of the quenching, while the stepped quenching comprises only one quenching operation at an intermediate temperature between the dissolution and ambient in various known environments (salt bath, oil bath, hot water).
  • the average initial cooling rate [step a)] is, in general, high, greater than 3 ° C / sec. between the dissolution temperature and 260 ° C.
  • the average final quenching speed [step c)] is greater than 60 ° C / min. between the temperature reached at the end of [step b)] and 100 ° C.
  • the effective surface temperature, when the quenching is interrupted (start of step b) and the effective duration of the latter (T) which depend, among other things, on the nature of the alloy, the shape and the size of the parts, etc. are easily accessible to those skilled in the art through experience, calculation or simulation.
  • the durations and temperatures of interruption being located inside the ABDCEF perimeter, make it possible to improve the resistance to corrosion (fig. 2).
  • these times and temperatures will be within the CDEGH perimeter (fig. 2).
  • the durations and temperatures of interruption located within the CDEF perimeter lead to the best results (fig. 3).
  • Polygonal perimeters plotted in semi-logarithmic coordinates, have vertices whose coordinates are:
  • the stress relief can be carried out after quenching by plastic deformation of tension or compression and tempering is preferably practiced in the temperature range from 130 to 170 ° C for durations between 7 and 15 hours for alloys type 7975 and between 10 and 30 h for alloys of type 2214.
  • Corrosion tests were carried out on 2214 alloy wafers of dimensions 40 x 80 x 5 mm. The largest dimension is parallel to the direction of rolling. After dissolving at 505 ° C, the wafers were cooled to the bearing temperature at a speed of 260 C / sec. Different temperatures and interruption times were applied, then the anointed test pieces underwent a 24-hour tempering at 150 ° C. On these samples, as well as on a control sample conventionally quenched and treated T6, the Vickers hardnesses were measured as well. than the degree of leaf corrosion. The results1 corresponding to these tests are given in FIG. 2. Above each experimental point, there is the ratio of the Vickers hardness of the test to the Vickers hardness of the usual T6 state. Below each point, the corrosion index is given, the meaning of which is as follows:
  • the DEGH domain corresponds to hardnesses almost equal to or greater than the T6 state and to immunity against intergranular corrosion.
  • a sheet of 7475 (according to the specifications of the AA) of 60 mm thickness was treated, on the one hand, according to the conventional process of quenching with cold water and tempered (states T6 and T73) and, d 'other hand, according to the invention, by quenching in cold water from 470 ° C and interruption for 6 minutes at 185 ° C and 8 hours return to 160 ° C.
  • the results are reported in Table II.
  • the method according to the invention applies to the quenching of all aluminum curing alloys with structural hardening, in particular to alloys of the 2000, 6000 and 7000 series (according to the nomenclature of the Aluminum Association).

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)
  • Heat Treatment Of Articles (AREA)
  • Heat Treatment Of Nonferrous Metals Or Alloys (AREA)
EP81420167A 1980-11-05 1981-11-04 Méthode de trempe interrompue des alliages à base d'aluminium Expired EP0051549B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8023944A FR2493345A1 (fr) 1980-11-05 1980-11-05 Methode de trempe interrompue des alliages a base d'aluminium
FR8023944 1980-11-05

Publications (2)

Publication Number Publication Date
EP0051549A1 EP0051549A1 (fr) 1982-05-12
EP0051549B1 true EP0051549B1 (fr) 1985-01-23

Family

ID=9247839

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81420167A Expired EP0051549B1 (fr) 1980-11-05 1981-11-04 Méthode de trempe interrompue des alliages à base d'aluminium

Country Status (5)

Country Link
US (1) US4488913A (cs)
EP (1) EP0051549B1 (cs)
JP (1) JPS57108251A (cs)
DE (1) DE3168539D1 (cs)
FR (1) FR2493345A1 (cs)

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2626958B2 (ja) * 1993-03-16 1997-07-02 スカイアルミニウム株式会社 成形性および焼付硬化性に優れたアルミニウム合金板の製造方法
JPH07197219A (ja) * 1993-12-28 1995-08-01 Furukawa Electric Co Ltd:The 成形用アルミニウム合金板材の製造方法
CA2197547C (en) * 1994-09-06 2001-05-01 Michael Jackson Bull Heat treatment process for aluminum alloy sheet
DE19524176C1 (de) * 1995-07-03 1996-09-26 Daimler Benz Ag Verfahren zum Zwischenabschrecken von aus einem Lösungs-Glühofen kommenden Leichtmetall-Gußstücken
US6224693B1 (en) 1999-12-10 2001-05-01 Tenedora Nemak, S.A. De C.V. Method and apparatus for simplified production of heat treatable aluminum alloy castings with artificial self-aging
US6387195B1 (en) 2000-11-03 2002-05-14 Brush Wellman, Inc. Rapid quench of large selection precipitation hardenable alloys
CN1489637A (zh) * 2000-12-21 2004-04-14 �Ƹ��� 铝合金产品及人工时效方法
US8083871B2 (en) 2005-10-28 2011-12-27 Automotive Casting Technology, Inc. High crashworthiness Al-Si-Mg alloy and methods for producing automotive casting
US8840737B2 (en) * 2007-05-14 2014-09-23 Alcoa Inc. Aluminum alloy products having improved property combinations and method for artificially aging same
US8673209B2 (en) * 2007-05-14 2014-03-18 Alcoa Inc. Aluminum alloy products having improved property combinations and method for artificially aging same
US8168015B2 (en) * 2008-10-23 2012-05-01 GM Global Technology Operations LLC Direct quench heat treatment for aluminum alloy castings
US8206517B1 (en) 2009-01-20 2012-06-26 Alcoa Inc. Aluminum alloys having improved ballistics and armor protection performance
DE102010061895A1 (de) * 2010-07-21 2012-01-26 Bdw Technologies Gmbh Verfahren zum Wärmebehandeln eines Gussbauteils
CN114107848B (zh) * 2021-11-24 2022-11-29 中国兵器科学研究院宁波分院 一种降低铝合金薄壁构件残余应力的方法

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3816190A (en) * 1969-03-13 1974-06-11 Vmw Ranshofen Berndorf Ag Method of heat-treatment of aluminum alloys
IL39200A (en) * 1972-04-12 1975-08-31 Israel Aircraft Ind Ltd Method of reducing the susceptibility of alloys,particularly aluminum alloys,to stress-corrosion cracking
SE414193B (sv) * 1973-10-26 1980-07-14 Aluminum Co Of America Sett att termiskt behandla en artikel av en aluminiumlegering for att ge denna hog hallfasthet och god herdighet mot spenningskorrosion
US3935007A (en) * 1974-11-13 1976-01-27 Sumitomo Light Metal Industries, Ltd. Aluminum alloy of age hardening type
DE2810958A1 (de) * 1977-12-30 1979-07-05 Alusuisse Verfahren zur waermebehandlung von aushaertbaren aluminiumlegierungen

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
METALLURGICAL TRANSACTIONS, vol. 4, juin 1973 M. ABE et al. "Influence of the precipitate-free zone width on the tensile properties of an A1-6 Wt Pct Zn-1.2 Wt Pct Mg alloy" pages 1499-1505 *

Also Published As

Publication number Publication date
FR2493345A1 (fr) 1982-05-07
EP0051549A1 (fr) 1982-05-12
FR2493345B1 (cs) 1984-11-02
DE3168539D1 (en) 1985-03-07
US4488913A (en) 1984-12-18
JPS57108251A (en) 1982-07-06

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