EP0297004A2 - Verwendung eines Verfahrens zur Verbesserung eines Produktes aus einer martensitischen Umwandlungslegierung - Google Patents

Verwendung eines Verfahrens zur Verbesserung eines Produktes aus einer martensitischen Umwandlungslegierung Download PDF

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Publication number
EP0297004A2
EP0297004A2 EP88420216A EP88420216A EP0297004A2 EP 0297004 A2 EP0297004 A2 EP 0297004A2 EP 88420216 A EP88420216 A EP 88420216A EP 88420216 A EP88420216 A EP 88420216A EP 0297004 A2 EP0297004 A2 EP 0297004A2
Authority
EP
European Patent Office
Prior art keywords
treatment
product
temperature
hot
cold
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
EP88420216A
Other languages
English (en)
French (fr)
Other versions
EP0297004B1 (de
EP0297004A3 (en
Inventor
Bernard Prandi
Alain Dubertret
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.)
Compagnie Europeenne du Zirconium Cezus SA
Original Assignee
Compagnie Europeenne du Zirconium Cezus 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.)
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Publication date
Application filed by Compagnie Europeenne du Zirconium Cezus SA filed Critical Compagnie Europeenne du Zirconium Cezus SA
Publication of EP0297004A2 publication Critical patent/EP0297004A2/de
Publication of EP0297004A3 publication Critical patent/EP0297004A3/fr
Application granted granted Critical
Publication of EP0297004B1 publication Critical patent/EP0297004B1/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
    • C22F1/006—Resulting in heat recoverable alloys with a memory effect

Definitions

  • the present invention relates to a method for improving the ductility of a metal alloy product with martensitic transformation by means of a succession of heat treatments, as well as the use of this method to facilitate the transformation of semi-finished products into alloy with shape memory.
  • alloys with martensitic transformation exhibit poor cold deformability, which is particularly troublesome when they have to be delivered in semi-finished products of small thickness or diameter, for example between 0.5 and 3 mm .
  • This insufficient ductility with respect to deformations such as rolling, drawing, drawing or hammering particularly affects the transformation into semi-finished products of certain shape memory alloys.
  • alloys of the Ti-Ni 50/50 at% and Cu-A1 14 at% - Ni 4 at% types typically have deformation rates between anneals of 10% or less, which makes their cold transformation excessively long and expensive.
  • each hot or cold heat treatment After each hot or cold heat treatment, the product treated is usually returned for practical reasons to room temperature.
  • Each hot treatment has an effect of homogenization and relaxation of internal stresses, incomplete relaxation since there is no recrystallization, the residual stresses then having a favorable effect for the cold treatment which follows it.
  • Each cold treatment leads to a crystallization of fine martensite, and the succession of treatments results in homogenization with softening of the matrix and, in the martensitic phase, an increasingly fine crystallization and tending towards isotropy.
  • the process of the invention makes it possible to obtain, in one or more cycles depending on the alloy considered, an exceptional ductility resulting, for example, by a multiplication by 3 of the elongation at break of the tensile test.
  • the improvement in ductility of the product with martensitic transformation treated is progressive, the improvement effect of each of the successive cycles decreasing, so that in practice it can be limit to at most 5 cycles and typically 3 cycles, 80 to 95% of the possible improvement in ductility being then obtained.
  • the minimum temperature of the hot treatment (s) can be compared to "M s " like the temperature of the cold treatment (s) during any subsequent cycles, this hot treatment temperature then remaining at least equal to 600 ° C.
  • the product in order to maintain the homogenized or partially homogenized state produced by the hot treatment or by each of the hot treatments, it is preferable to cool the product by quenching, typically a quenching with water, after this or these hot treatments .
  • the product to be treated When the product to be treated is in the hot-worked state, it is it is it is preferable to start the first cycle of treatments according to the invention, which may be the only cycle of treatments, with its cold treatment.
  • the heat treatments of the invention can be brief, which is a great advantage for industrial manufacturing: typically from a few seconds to 5 min for cold treatments, from 30 s to 20 min for hot treatments, processed products most often having a diameter or thickness of between 0.2 and 20 mm.
  • Common cooling agents for cold treatments are liquid nitrogen (-196 ° C) and dry ice (-70 ° C), the former making it possible to treat all temperature alloys under good conditions " M s "at least equal to -145 ° C.
  • Cold treatments can be carried out by soaking in the cooling agent or by passing through this agent, or by spraying this agent.
  • the process of the invention thus provides the following advantages: - stabilization of the austenitic and / or martensitic states, resulting from the modification with tightening of the local austenite / martensite transformation points and intervals of the product; - improvement of the educational ability of semi-finished products in shape memory alloy. - No mechanical treatment is associated with successive heat treatments of the process of the invention, which facilitates the execution of this process.
  • the sequence (T3) in this case shows the surprising effect on A% of a single cycle of heat treatments according to the invention.
  • the temperature at the start of recrystallization for a hot treatment of 10 min is, for the present alloy, from 910 to 920 ° C. and that risks of burns appear only above 950 ° C.
  • the considerable increase in tensile elongation here corresponds to a possibility of deformation with elongation of approximately 35%, before the following annealing or softening heat treatment, instead of less than 10% previously.

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 Steel (AREA)
  • Heat Treatment Of Articles (AREA)
  • Heat Treatment Of Sheet Steel (AREA)
EP88420216A 1987-06-24 1988-06-22 Verwendung eines Verfahrens zur Verbesserung eines Produktes aus einer martensitischen Umwandlungslegierung Expired - Lifetime EP0297004B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8709272A FR2617187B1 (fr) 1987-06-24 1987-06-24 Procede d'amelioration de la ductilite d'un produit en alliage a transformation martensitique et son utilisation
FR8709272 1987-06-24

Publications (3)

Publication Number Publication Date
EP0297004A2 true EP0297004A2 (de) 1988-12-28
EP0297004A3 EP0297004A3 (en) 1989-06-28
EP0297004B1 EP0297004B1 (de) 1991-05-08

Family

ID=9352719

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88420216A Expired - Lifetime EP0297004B1 (de) 1987-06-24 1988-06-22 Verwendung eines Verfahrens zur Verbesserung eines Produktes aus einer martensitischen Umwandlungslegierung

Country Status (5)

Country Link
US (1) US4878954A (de)
EP (1) EP0297004B1 (de)
JP (1) JPS6421042A (de)
DE (1) DE3862691D1 (de)
FR (1) FR2617187B1 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2699263A1 (fr) * 1992-12-15 1994-06-17 Cryotechnologies Refroidisseur muni d'un doigt froid équipé d'un coupleur thermique.
US6106642A (en) * 1998-02-19 2000-08-22 Boston Scientific Limited Process for the improved ductility of nitinol
CN102011038A (zh) * 2010-12-15 2011-04-13 河北师范大学 Mn50Ni50-xAlx高温铁磁形状记忆合金材料及其制备方法

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0328319A (ja) * 1989-06-26 1991-02-06 Nisshin Steel Co Ltd ステンレス鋼製のパイプ継手およびその製造法
JPH0645822B2 (ja) * 1990-04-18 1994-06-15 川崎製鉄株式会社 マルテンサイト系ステンレス鋼管の製造方法
US6149742A (en) * 1998-05-26 2000-11-21 Lockheed Martin Corporation Process for conditioning shape memory alloys
US20040025985A1 (en) * 2002-02-01 2004-02-12 Mide Technology Corporation Energy absorbing shape memory alloys
DE102004052962A1 (de) * 2004-10-29 2006-05-04 Linde Ag Absperrarmatur und Verfahren zur Herstellung einer Absperrarmatur
CN114570948B (zh) * 2022-02-15 2023-04-11 中南大学 一种对增材制造形状记忆合金零件控形的后处理方法
CN115807199B (zh) * 2022-11-24 2023-12-22 新疆大学 一种同时提高块体非晶合金复合材料屈服强度和塑性的方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0035069A1 (de) * 1980-03-03 1981-09-09 BBC Aktiengesellschaft Brown, Boveri & Cie. Formgedächtnislegierung auf der Basis von Cu/Al oder Cu/Al/Ni und Verfahren zur Stabilisierung des Zweiwegeffektes
EP0161066A1 (de) * 1984-04-04 1985-11-13 RAYCHEM CORPORATION (a Delaware corporation) Legierungen auf Nickel-Titanbasis
EP0161952A2 (de) * 1984-04-12 1985-11-21 Souriau Et Cie Verfahren zur Bedienung eines Zustands zu einem Gegenstand auf eine Formgedächtnislegierung mit zwei reversiblen Gedächtniszuständen

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4067752A (en) * 1973-11-19 1978-01-10 Raychem Corporation Austenitic aging of metallic compositions
US4304613A (en) * 1980-05-12 1981-12-08 The United States Of America As Represented By The Secretary Of The Navy TiNi Base alloy shape memory enhancement through thermal and mechanical processing
JPS58151445A (ja) * 1982-02-27 1983-09-08 Tohoku Metal Ind Ltd 可逆形状記憶効果を有するチタンニツケル合金およびその製造方法
EP0095798B1 (de) * 1982-05-13 1987-04-08 Leuven Research & Development V.Z.W. Verfahren zur Wärmebehandlung von Gegenständen aus Formgedächtnislegierungen und Gegenstände nach diesem Verfahren hergestellt
DE3573932D1 (en) * 1984-09-07 1989-11-30 Nippon Steel Corp Shape memory alloy and method for producing the same
JPS63654A (ja) * 1986-06-19 1988-01-05 Fujitsu Ltd プロセッサ間の通信制御方法
JP2606842B2 (ja) * 1987-05-30 1997-05-07 株式会社東芝 電気掃除機
JP2506853B2 (ja) * 1987-11-25 1996-06-12 松下電器産業株式会社 調理器

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0035069A1 (de) * 1980-03-03 1981-09-09 BBC Aktiengesellschaft Brown, Boveri & Cie. Formgedächtnislegierung auf der Basis von Cu/Al oder Cu/Al/Ni und Verfahren zur Stabilisierung des Zweiwegeffektes
EP0161066A1 (de) * 1984-04-04 1985-11-13 RAYCHEM CORPORATION (a Delaware corporation) Legierungen auf Nickel-Titanbasis
EP0161952A2 (de) * 1984-04-12 1985-11-21 Souriau Et Cie Verfahren zur Bedienung eines Zustands zu einem Gegenstand auf eine Formgedächtnislegierung mit zwei reversiblen Gedächtniszuständen

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
JEE, vol. 20, no. 201, septembre 1983, pages 89-93; S. IZUNO: "The remarkable shape-memory alloys: The petals move to the temperature" *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2699263A1 (fr) * 1992-12-15 1994-06-17 Cryotechnologies Refroidisseur muni d'un doigt froid équipé d'un coupleur thermique.
US6106642A (en) * 1998-02-19 2000-08-22 Boston Scientific Limited Process for the improved ductility of nitinol
US6540849B2 (en) 1998-02-19 2003-04-01 Scimed Life Systems, Inc. Process for the improved ductility of nitinol
CN102011038A (zh) * 2010-12-15 2011-04-13 河北师范大学 Mn50Ni50-xAlx高温铁磁形状记忆合金材料及其制备方法
CN102011038B (zh) * 2010-12-15 2012-02-29 河北师范大学 Mn50Ni50-xAlx高温铁磁形状记忆合金材料及其制备方法

Also Published As

Publication number Publication date
US4878954A (en) 1989-11-07
FR2617187B1 (fr) 1989-10-20
FR2617187A1 (fr) 1988-12-30
EP0297004B1 (de) 1991-05-08
JPS6421042A (en) 1989-01-24
JPH036986B2 (de) 1991-01-31
EP0297004A3 (en) 1989-06-28
DE3862691D1 (de) 1991-06-13

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