EP0297004B1 - Utilisation d'un procédé pour améliorer la ductilité d'un produit en alliage à transformation martensitique - Google Patents

Utilisation d'un procédé pour améliorer la ductilité d'un produit en alliage à transformation martensitique Download PDF

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Publication number
EP0297004B1
EP0297004B1 EP88420216A EP88420216A EP0297004B1 EP 0297004 B1 EP0297004 B1 EP 0297004B1 EP 88420216 A EP88420216 A EP 88420216A EP 88420216 A EP88420216 A EP 88420216A EP 0297004 B1 EP0297004 B1 EP 0297004B1
Authority
EP
European Patent Office
Prior art keywords
treatment
product
use according
temperature
hot
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
EP88420216A
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German (de)
English (en)
French (fr)
Other versions
EP0297004A2 (fr
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
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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 the use of a heat treatment for improving the ductility of a semi-finished metal alloy with martensitic transformation by means of a succession of hot and cold treatments, in particular to facilitate the transformation of semi-finished products into shape memory alloy.
  • Document EP-A-0 161 952 discloses a process for educating a metal alloy object with martensitic transformation "with shape memory", this process consisting in imposing on the object, over one or more cycles , a series of thermal and / or mechanical stresses, the object being for example, in each cycle, treated in the austenitic phase then deformed and cooled in the martensitic phase. This education process is used to impart better memory accuracy.
  • alloys with martensitic transformation exhibit poor cold deformability, which is particularly troublesome when they have to be delivered in half: products of thick or small 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-Al 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.
  • the subject of the invention is the use of a heat treatment of a semi-product in martensitic transformation alloy, comprising in succession a cold treatment below the temperature M s of the start of martensitic transformation of the semi-product and a hot treatment at a temperature at least equal to 700 ° C., in order to improve the ductility of said semi-finished product with regard to its successive working, characterized in that after working said semi-working, it is subjected to a cycle of said heat treatment , the cold treatment of said cycle being carried out at a temperature both below -50 ° C and (M s -50 ° C), and the hot treatment does not result in recrystallization of the product unless it is the last heat treatment.
  • Said semi-finished product is optionally subjected to at least one additional cycle following said first cycle, the cold treatment of this additional cycle being at a temperature below both -50 ° C and (M s -30 ° C) and its treatment hot being at temperature at least equal to 600 ° C. and not causing the recrystallization of said semi-finished product when it is not the last heat treatment.
  • the cold and hot treatments of the successive cycles are alternated.
  • each hot or cold heat treatment After each hot or cold heat treatment, the product is usually brought back to room temperature for practical reasons.
  • Each hot treatment has an effect of homogenization and relaxation of internal constraints, 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 method 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 product ductility at martensitic transformation treated is progressive, the improvement effect of each of the successive cycles decreasing, so that in practice we can limit our to at most 5 cycles and typically to 3 cycles, 80 to 95% of the improvement possible ductility then being 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.
  • Washers 3 mm thick cut from the bars of the three compositions were each co-laminated at around 900 ° C. between two stainless steel washers of the AISI 304 type. The assessment of the ductility is then made by simple test of folding. The laminated washers, separated from their stainless steel covers, were then immersed 3 to 4 min in liquid nitrogen, then after returning to the ambient treated 1 min at a temperature between 800 ° and 900 ° C and quenched at water, all of these cold and hot treatments constituting the first cycle of the process according to the invention. An increase in the ductility was not very noticeable for (CI) whose cold treatment temperature is 46 ° C below M s , and very clear for (C2) and (C3).
  • 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.

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  • 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 Utilisation d'un procédé pour améliorer la ductilité d'un produit en alliage à transformation martensitique Expired - Lifetime EP0297004B1 (fr)

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 EP0297004A2 (fr) 1988-12-28
EP0297004A3 EP0297004A3 (en) 1989-06-28
EP0297004B1 true EP0297004B1 (fr) 1991-05-08

Family

ID=9352719

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88420216A Expired - Lifetime EP0297004B1 (fr) 1987-06-24 1988-06-22 Utilisation d'un procédé pour améliorer la ductilité d'un produit en alliage à transformation martensitique

Country Status (5)

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

Families Citing this family (10)

* 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
FR2699263B1 (fr) * 1992-12-15 1995-01-27 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
US6149742A (en) * 1998-05-26 2000-11-21 Lockheed Martin Corporation Process for conditioning shape memory alloys
WO2003064717A1 (en) * 2002-02-01 2003-08-07 Mide Technology Corporation Enhery aborbring shape memory alloys
DE102004052962A1 (de) * 2004-10-29 2006-05-04 Linde Ag Absperrarmatur und Verfahren zur Herstellung einer Absperrarmatur
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
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

Family Cites Families (11)

* 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
EP0035069B1 (de) * 1980-03-03 1983-12-21 BBC Aktiengesellschaft Brown, Boveri & Cie. Formgedächtnislegierung auf der Basis von Cu/Al oder Cu/Al/Ni und Verfahren zur Stabilisierung des Zweiwegeffektes
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 (en) * 1982-05-13 1987-04-08 Leuven Research & Development V.Z.W. Process for thermally treating heat recoverable metallic articles and articles thereby obtained
US4502896A (en) * 1984-04-04 1985-03-05 Raychem Corporation Method of processing beta-phase nickel/titanium-base alloys and articles produced therefrom
FR2563055A1 (fr) * 1984-04-12 1985-10-18 Souriau & Cie Procede de realisation de connecteur
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

Also Published As

Publication number Publication date
DE3862691D1 (de) 1991-06-13
JPS6421042A (en) 1989-01-24
US4878954A (en) 1989-11-07
EP0297004A2 (fr) 1988-12-28
FR2617187A1 (fr) 1988-12-30
EP0297004A3 (en) 1989-06-28
JPH036986B2 (enrdf_load_stackoverflow) 1991-01-31
FR2617187B1 (fr) 1989-10-20

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