EP0848073B1 - Spannungsfreimachen eines Werkstücks aus aushärtbaren Aluminium-Legierung - Google Patents

Spannungsfreimachen eines Werkstücks aus aushärtbaren Aluminium-Legierung Download PDF

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Publication number
EP0848073B1
EP0848073B1 EP19970203934 EP97203934A EP0848073B1 EP 0848073 B1 EP0848073 B1 EP 0848073B1 EP 19970203934 EP19970203934 EP 19970203934 EP 97203934 A EP97203934 A EP 97203934A EP 0848073 B1 EP0848073 B1 EP 0848073B1
Authority
EP
European Patent Office
Prior art keywords
product
cold
stress
permanent
aluminium alloy
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 - Lifetime
Application number
EP19970203934
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English (en)
French (fr)
Other versions
EP0848073A1 (de
Inventor
Alfred Johann Peter Haszler
Alfred Ludwig Heinz
Otmar Martin Müller
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.)
Novelis Koblenz GmbH
Original Assignee
Corus Aluminium Walzprodukte 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 Corus Aluminium Walzprodukte GmbH filed Critical Corus Aluminium Walzprodukte GmbH
Priority to EP19970203934 priority Critical patent/EP0848073B1/de
Publication of EP0848073A1 publication Critical patent/EP0848073A1/de
Application granted granted Critical
Publication of EP0848073B1 publication Critical patent/EP0848073B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • 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
    • C22F1/043—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 silicon 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
    • C22F1/053—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
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/26—Methods of annealing
    • C21D1/30—Stress-relieving

Definitions

  • the invention relates to a method of stress relieving an age hardenable aluminium alloy product by a permanent cold plastic deformation operation after solution heat treatment and quenching.
  • US-A-4294625 for example describes a process in which aluminium alloy is cast, hot worked into plate, solution treated, quenched, pre-aged, cold rolled to reduce thickness by 11 ⁇ 2% and then stretched for stress relieving prior to ageing.
  • the product is for use in aircraft.
  • WO 95/24514 similarly briefly mentions stretching a quenched thick aluminium alloy product to improve flatness and reduce residual stress.
  • JP-A-54-102214 describes manufacture of aluminium alloy pipe or rod with low residual stress, by hardening followed by stretch levelling by 0.5 - 1.0%, then roll levelling and further stretch levelling by 0.5 - 1.0%, followed by tempering at 210 - 250°C for 1 - 2 hours to relieve stress further.
  • GB-A-2025818 discusses manufacture of aluminium alloy rings by hot ring rolling, solution heat treatment, quenching, cold rolling for stress relieving and ageing. The diameter expansion in the cold rolling is 1 to 3%.
  • JP-A-3-2359 describes cold compression of a complex shaped hollow conical billet of aluminium alloy, after solution heat treatment and prior to ageing.
  • JP-A-4-187747 describes two-axis cold compression carried out on an aluminium alloy block of complex shape having insert parts located in apertures.
  • the strength of the stretcher machine may be insufficient to achieve the desired stretching degree. This of course depends not only on the dimensions of the plate but also on the plate alloy or - more precisely - on the flow stress of the plate material in the solutionized and quenched condition.
  • the object of the invention is therefore to provide a method of stress relieving of an age hardenable aluminium alloy product which is especially applicable to alloy product of large cross-section.
  • a method of manufacture of a product of an age hardenable aluminium alloy said product is a plate product, having a length-, a width- and a thickness-direction, comprising the steps of :-
  • the age hardening may be natural ageing or artificial ageing.
  • the stress relieving permanent deformation by stretching defined as the permanent elongation in the direction of stretching should be not more than 15 %, should more preferably be in the range of 0.3 - 5 %, and most preferably be in the range of 0.5 - 3 %.
  • the stress relieving permanent deformation by compression defined as the permanent reduction in the direction of compression should be in the range of 0.2 - 5 %, and should more preferably be in the range of 0.5 - 3 %.
  • the cold compression may be given by forging, e.g. by a forging tool in overlapping steps.
  • the stress relieving stretching of the product preferably takes place before the compression.
  • the deformation is preferably given before substantially any age hardening after quenching.
  • the product is a thick plate having a final thickness of 2 inches(5cm) or more, preferably 4 inches (10cm) or more and most preferably 6 inches (15cm) or more.
  • the invention is particularly effective in meeting requirements of strength and toughness properties and distortion when the aluminium alloy belongs to the Aluminium Association AA 2XXX, the AA 6XXX or the AA 7XXX series.
  • the distortion after machining is less than 50 ⁇ m.
  • L, S, T, LT, L-T, etc. denote the testing directions in accordance with ASTM E399. ;Tensile testing was performed in accordance with ASTM E8 and ASTM B557. TYS is tensile yield strength. UTS is ultimate tensile strength. A 4d is elongation at fracture for a round tensile specimen with a gauge length of four times diameter. Fracture toughness testing for K Ic values was performed according to ASTM B645 and ASTM E399. Machining distortion testing was carried out in accordance with Boeing Materials Specification BMS 7-323B, para. 8.6 and Figs. 4 and 5.
  • Table 2 gives the deformation degrees and the results of tests on the products.
  • Property Cold deformation cold compressed 1.6 - 1.9 % stretched 0.6 - 0.7 % and cold compressed 0.9 - 1.1 % tension L T/4 TYS [MPa] 421 431 UTS [MPa] 498 505 A 4d [%] 11.0 9.5 tension LT, T/4 TYS [MPa] 420 421 UTS [MPa] 491 493 A 4d [%] 10.0 10.9 tension ST, T/2 TYS [MPa] 375 382 UTS [MPa] 480 485 A 4d [%] 7.0 5.7 K Ic L-T, T/4 [MPa m 0.5 ] 26.2 27.7 K Ic T-L, T/4 [MPa m 0.5 ] 26.1 27.2 K Ic S-L, T/2 [MPa m 0.5 ] 21.6 24.2 Machining distortion [10 -6 m] 50 50

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)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)

Claims (12)

  1. Verfahren zur Herstellung eines Erzeugnisses aus einer alterungshärtbaren Aluminiumlegierung, wobei das Erzeugnis ein Plattenerzeugnis mit einer Längen-, einer Breiten- und einer Dickenrichtung ist, das folgende Verfahrensschritte aufweist:
    (i) Gießen der alterungshärtbaren Legierung;
    (ii) Formen der Gußlegierung zur Erzeugung eines geformten Erzeugnisses;
    (iii) Lösungsglühbehandlung des geformten Erzeugnisses;
    (iv) Abschrecken des lösungsglühbehandelten Erzeugnisses;
    (v) Duchführung eines Spannungsabbaus des abgeschreckten Erzeugnisses, indem das Erzeugnis einer permanenten, plastischen Kaltumformung mittels eines spannungsabbauenden, mechanischen Kaltstreckens in der Längenrichtung unterzogen wird,
    dadurch gekennzeichnet, daß dem Schritt (a), in dem das Produkt einer spannungsabbauenden mechanischen Kaltstreckung in der Längsrichtung unterworfen wird, der Schritt (b) folgt, in welchem eine das Produkt einer spannungsabbauenden Kaltverdichtung in der Dickenrichtung unterworfen wird.
  2. Verfahren nach Anspruch 1, wobei die Schritte (a) und (b) im wesentlichen vor dem Alterungshärten durchgeführt werden, das sich an das Abschrecken anschließt.
  3. Verfahren nach einem der Ansprüche 1 oder 2, wobei die permanente Umformung in Schritt (a), die als die permanente Längung in der Streckrichtung definiert ist, nicht mehr als 15% beträgt.
  4. Verfahren nach Anspruch 3, wobei die permanente Umformung in Schritt (a) im Bereich von 0,3 - 5% liegt.
  5. verfahren nach Anspruch 4, wobei die permanente Umformung in Schritt (a) im Bereich von 0,5 - 3% liegt.
  6. Verfahren nach einem der vorhergehenden Ansprüche, wobei die permanente Umformung in Schritt (b), die als die permanente Reduktion in der Verdichtüngsrichtung definiert ist, im Bereich von 0,2 - 5% liegt.
  7. Verfahren nach Anspruch 6, worin die permanente Umformung in Schritt (b) im Bereich von 0,5 - 3% liegt.
  8. Verfahren nach einem der vorhergehenden Ansprüche, wobei die Kaltverdichtung in Schritt (b) mittels eines Schmiedewerkzeugs in sich überlappenden Schritten durchgeführt wird.
  9. Verfahren nach einem der vorhergehenden Ansprüche, wobei das Erzeugnis eine dicke Platte mit einer Enddicke von wenigstens 5 cm (2 inches) ist.
  10. Verfahren nach Anspruch 9, wobei die Enddicke wenigstens 10 cm (4 inches) beträgt.
  11. Verfahren nach Anspruch 10, wobei die Enddicke wenigstens 15 cm (6 inches) beträgt.
  12. Verfahren nach einem der vorhergehenden Ansprüche, wobei die Aluminiumlegierung des Erzeugnisses zu einer der AA 2XXX-, AA 6XXX und AA 7XXX-Reihen gehört.
EP19970203934 1996-12-16 1997-12-15 Spannungsfreimachen eines Werkstücks aus aushärtbaren Aluminium-Legierung Expired - Lifetime EP0848073B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP19970203934 EP0848073B1 (de) 1996-12-16 1997-12-15 Spannungsfreimachen eines Werkstücks aus aushärtbaren Aluminium-Legierung

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP96203563 1996-12-16
EP96203563 1996-12-16
EP19970203934 EP0848073B1 (de) 1996-12-16 1997-12-15 Spannungsfreimachen eines Werkstücks aus aushärtbaren Aluminium-Legierung

Publications (2)

Publication Number Publication Date
EP0848073A1 EP0848073A1 (de) 1998-06-17
EP0848073B1 true EP0848073B1 (de) 2002-05-08

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EP19970203934 Expired - Lifetime EP0848073B1 (de) 1996-12-16 1997-12-15 Spannungsfreimachen eines Werkstücks aus aushärtbaren Aluminium-Legierung

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Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19926229C1 (de) † 1999-06-10 2001-02-15 Vaw Ver Aluminium Werke Ag Verfahren zum prozeßintegrierten Wärmebehandeln
DE19956895C1 (de) * 1999-11-26 2000-11-16 Daimler Chrysler Ag Verfahren zum Abbauen der Eigenzugspannungen
RU2184174C2 (ru) * 2000-08-01 2002-06-27 Государственное предприятие "Всероссийский научно-исследовательский институт авиационных материалов" Способ получения полуфабрикатов из алюминиевого сплава и изделие, полученное этим способом
FR2879217B1 (fr) * 2004-12-13 2007-01-19 Pechiney Rhenalu Sa Toles fortes en alliage ai-zn-cu-mg a faibles contraintes internes
CN102528397A (zh) * 2012-01-31 2012-07-04 西南铝业（集团）有限责任公司 一种鞋模用铝合金排材的生产方法
JP6412496B2 (ja) * 2013-07-04 2018-10-24 昭和電工株式会社 切削用素材の製造方法
CN111218629B (zh) * 2020-02-28 2024-02-09 株洲中车天力锻业有限公司 一种高筒铝合金环去应力装置
CN111455295A (zh) * 2020-04-24 2020-07-28 西北工业大学 一种钛合金的应力时效热处理工艺

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54102214A (en) * 1978-01-31 1979-08-11 Kobe Steel Ltd Manufacture of al-mg si type corrosion resistant, free cutting aluminum alloy pipe or rod with little residual
GB2025818B (en) * 1978-07-19 1982-06-09 Doncaster & Sons Ltd D Method of producing rings from aluminium-based alloys
US4294625A (en) * 1978-12-29 1981-10-13 The Boeing Company Aluminum alloy products and methods
JPH0733561B2 (ja) * 1989-05-26 1995-04-12 日産自動車株式会社 フランジ付き筒状部材の製造方法
US4968359A (en) * 1989-08-14 1990-11-06 Bonal Technologies, Inc. Stress relief of metals
JPH083139B2 (ja) * 1990-11-22 1996-01-17 日本鋼管株式会社 厚肉・複雑形状の熱処理型アルミニウム合金部材の製造方法
WO1995024514A1 (en) * 1994-03-10 1995-09-14 Reynolds Metals Company Heat treatment for thick aluminum plate

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EP0848073A1 (de) 1998-06-17

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