EP2976441A1 - Alliage à mémoire de forme à base de fer - Google Patents

Alliage à mémoire de forme à base de fer

Info

Publication number
EP2976441A1
EP2976441A1 EP13741745.7A EP13741745A EP2976441A1 EP 2976441 A1 EP2976441 A1 EP 2976441A1 EP 13741745 A EP13741745 A EP 13741745A EP 2976441 A1 EP2976441 A1 EP 2976441A1
Authority
EP
European Patent Office
Prior art keywords
group
shape memory
alloy
elements
weight
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
EP13741745.7A
Other languages
German (de)
English (en)
Other versions
EP2976441B1 (fr
Inventor
Rainer FECHTE-HEINEN
Christian Höckling
Lothar Patberg
Jens-Ulrik Becker
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.)
ThyssenKrupp Steel Europe AG
Original Assignee
ThyssenKrupp Steel Europe AG
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 ThyssenKrupp Steel Europe AG filed Critical ThyssenKrupp Steel Europe AG
Priority to EP13741745.7A priority Critical patent/EP2976441B1/fr
Publication of EP2976441A1 publication Critical patent/EP2976441A1/fr
Application granted granted Critical
Publication of EP2976441B1 publication Critical patent/EP2976441B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/004—Very low carbon steels, i.e. having a carbon content of less than 0,01%
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/001—Ferrous alloys, e.g. steel alloys containing N
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/34—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/52—Ferrous alloys, e.g. steel alloys containing chromium with nickel with cobalt
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/54—Ferrous alloys, e.g. steel alloys containing chromium with nickel with boron
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
    • 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
    • C21D2201/00—Treatment for obtaining particular effects
    • C21D2201/01—Shape memory effect
    • 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
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/005—Heat treatment of ferrous alloys containing Mn

Definitions

  • the invention relates to an iron-based shape memory alloy.
  • Shape memory alloys are known from different material systems. Also iron based, i. Shape memory alloys consisting essentially of the element iron are known from the prior art. For example, European Patent Application EP 2 194 154 A1 discloses a
  • a patent application proposes to consider a certain combination of the elements of the group Mn, Si, Cr and Ni in addition to Fe in the alloy.
  • Japanese Unexamined Patent Publication JP-A 2003/268502 moreover discloses an iron-based shape memory alloy with Ni contents which is intended to form precipitates during the production process by adding titanium in the alloy.
  • this has the disadvantage that the Ni-Ti precipitates, the properties of the nickel with respect to the shape memory effect due to its binding to titanium can not be used.
  • Shape memory alloy based on an Fe-Mn-Si alloy system to which the elements Nb and C have been additionally added is known from the published patent application EP 1 348 772 A1. The ones added to these legi sys te n s
  • Precipitation types are described in the following documents, for example Va n d i u m co o st e ff e ff e d i n ds ngen in CN 1280444 C.
  • Ti-Nb-V-N carbides / nitrides and Ni 3 Ti as precipitation types are described in the Japanese documents
  • European patent application EP 2 141 251 A1 discloses vanadium nitrogen and vanadium carbon precipitates used for the shape memory alloying effect.
  • the Chinese patent application CN 101215678 B relates to a so-called Ti-Nb-C-N system.
  • An Nb-Ti-V-C system for forming precipitates is known from CN 100523263 C.
  • Russian Patent RU 2270267 Cl discloses a V-Nb-W-C precipitation system for imaging the
  • iron-based shape memory alloy systems are of interest in terms of a reduction in manufacturing costs, an increase in the activation or
  • the present invention has for its object, a
  • Iron-based shape memory alloy that provides a one-way shape memory effect that requires reduced manufacturing costs, has an increased activation temperature compared to copper and nickel base alloys, and that has a corrosion and mildew properties compared to nickel-free and chromium-containing concepts are improved.
  • the above object is achieved according to a first teaching of the present invention by a shape memory alloy consisting of an alloy with the following alloy components in weight percent:
  • group 2 of the elements Ti, Nb, W, V, Zr with the following contents
  • Alloy constituents Mn, Si, Cr, Ni and one of the elements of group 1 (N, C, B) and one of the elements of group 2 (Ti, Nb, W, V, Zr) may be the
  • Group 2 alloy components to group 1 excretion formation is particularly favorable and supports the shape memory effect.
  • the ratio given is less than 0.5, the precipitating elements in the form of N, C and / or B can not be set and the shape memory effect is reduced since the group 1 elements are present in dissolved form in the microstructure. in the The result is also a negative effect on the reversibility of the
  • Phase transformation i. the reverse transformation of martensite into austenite. If the ratio of the sums of the alloying components formed in this way is greater than 2.0, unwanted solidifications due to the elements of the group 2 occur, which become lodged as free atoms in the microstructure and thus hinder the shape memory effect.
  • the Mangangeh old from 25 wt .-% to 32 wt .-% serves to stabilize the austenite in the structure and has particular influence on the switching temperature of
  • Shape memory material Below an Mn content of 25.0 wt .-% ferrite is increasingly formed, which adversely affects the shape memory effect. Increasing the Mn content above 32 wt .-% reduces the desired
  • Shape memory alloy at least 3.0 wt .-% Cr.
  • An increase in the Cr content to above 10.0 wt .-% in turn promotes ferrite formation, which, as already stated, has a negative effect on the shape memory effect.
  • Ni serves to stabilize the austenitic structure and also improves the formability of the material.
  • a Ni content below 0.1% by weight has no significant influence on the properties of the material.
  • Ni contents of more than 4.0% by weight lead to slight improvements only in connection with an increased Cr content
  • Cost savings of Ni content is limited to a maximum of 4.0 wt .-%.
  • the upper limit for all elements of group 1, ie N, C and B is at most 0.1% by weight.
  • the elements of group 2 (Ti, Nb, W, V, Zr) are present at a minimum level of 0.1% by weight, which applies to at least one element of this group.
  • the shape memory effect is positively influenced.
  • Phase transformation can be ensured by an appropriate content of one of the group 2 elements.
  • each individual element of group 2 does not exceed the maximum content of 1.5% by weight, more preferably the maximum content of each individual element is 1.2% by weight or 1.0% by weight, respectively This results in a reduction of unwanted solidifications.
  • the Cr content in weight percent is 3.0% ⁇ Cr ⁇ 8.0%, so that a good
  • Shape memory alloy is achieved.
  • the ferrite formation acts against the
  • the difference in Cr content and Ni content is 0% ⁇ Cr-Ni ⁇ 6.0%.
  • the maximum difference in the contents of Cr and Ni is limited to 6%. It has been found that an increase in the difference of the chromium and nickel content to more than 6 wt .-% leads to no appreciable improvements in the mechanical properties, but rather to the embrittlement of the material. A decrease in the difference to below 0%, i. that the nickel content is greater than the chromium content, however, may have a negative effect on the switching temperature, in which it is lowered and the
  • a further embodiment of the shape memory alloy comprises N, C and B in the following amount in percent by weight:
  • the shape memory alloy contains the elements N and / or C in amounts of at least 0.005% by weight and / or B in a content of at least 0.0001% by weight, the minimum contents can improve the formation of the precipitates.
  • the content of N and / or C is limited to a maximum of 0.1% by weight, preferably a maximum of 0.07% by weight, so that the precipitates do not become too large and can adversely affect the mechanical properties of the alloy .
  • the alloy contents of the alloying elements of the group 2 elements are limited. According to this
  • the upper limit is lowered to 1.0% by weight for each individual Group 2 element.
  • the formation of solidifications is thereby further reduced, so that the shape memory alloy has a good forming behavior.
  • Shape memory alloy sulfur, phosphorus and oxygen to contents of not more than 0.1 wt .-%, preferably to a maximum of 0.05 wt .-% and particularly preferably to a maximum of 0.03 wt .-% are limited to their negative influences, for example the corrosion resistance, reduce.
  • Molybdenum, copper and cobalt can be alloyed individually or in different combinations to improve the strength properties. A corresponding influence is limited in each case to contents of not more than 0.5% by weight.
  • Aluminum and magnesium can contribute individually or in combination to improve the corrosion resistance and also cause a reduction in the density of the molten steel. Their content is limited to a maximum of 5 wt .-%, preferably to a maximum of 2.0 wt .-%, more preferably to a maximum of 1.0 wt .-%.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Steel (AREA)

Abstract

L'invention concerne un alliage à mémoire de forme à base de fer. L'invention vise à proposer un alliage à mémoire de forme à base de fer unilatérale, qui présente, pour des coûts de fabrication réduits, une température d'activation plus élevée en comparaison avec des alliages à base de cuivre et de nickel et dont les propriétés en matière de corrosion et de façonnage sont améliorées en comparaison avec des alliages élaborés sans nickel et contenant du chrome. A cet effet, l'invention propose un alliage présentant les caractéristiques de la revendication 1.
EP13741745.7A 2013-03-22 2013-07-24 Alliage à mémoire de forme à base de fer Not-in-force EP2976441B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP13741745.7A EP2976441B1 (fr) 2013-03-22 2013-07-24 Alliage à mémoire de forme à base de fer

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
EP13160731 2013-03-22
EP13175891 2013-07-10
EP13741745.7A EP2976441B1 (fr) 2013-03-22 2013-07-24 Alliage à mémoire de forme à base de fer
PCT/EP2013/065657 WO2014146733A1 (fr) 2013-03-22 2013-07-24 Alliage à mémoire de forme à base de fer

Publications (2)

Publication Number Publication Date
EP2976441A1 true EP2976441A1 (fr) 2016-01-27
EP2976441B1 EP2976441B1 (fr) 2019-02-27

Family

ID=48875045

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13741745.7A Not-in-force EP2976441B1 (fr) 2013-03-22 2013-07-24 Alliage à mémoire de forme à base de fer

Country Status (2)

Country Link
EP (1) EP2976441B1 (fr)
WO (1) WO2014146733A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111235491A (zh) * 2019-12-27 2020-06-05 西北工业大学 一种高强度高塑性的形状记忆钢及其制备方法

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102018119296A1 (de) 2018-08-08 2020-02-13 Thyssenkrupp Ag Inline Vorrecken von Formgedächtnislegierungen, insbesondere Flachstahl
DE102018119289A1 (de) 2018-08-08 2020-02-13 Thyssenkrupp Ag Lösbares Befestigungssystem umfassend Formgedächtnismaterial und Verfahren zur Montage eines lösbaren Befestigungssystems
DE102018129640A1 (de) 2018-11-23 2020-05-28 Thyssenkrupp Ag Verfahren zum Vorspannen eines Bauwerks mit einer Spannvorrichtung und Verwendung einer solchen Spannvorrichtung zum Befestigen an einem Bauwerk
CN110358963B (zh) * 2019-07-15 2021-07-09 哈尔滨工程大学 一种FeMnAlNi形状记忆合金及其制备方法

Family Cites Families (10)

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Publication number Priority date Publication date Assignee Title
JP3970645B2 (ja) 2002-03-15 2007-09-05 淡路マテリア株式会社 鉄基形状記憶合金の製造方法
JP2003277827A (ja) 2002-03-20 2003-10-02 National Institute For Materials Science ＮｂＣ添加Ｆｅ−Ｍｎ−Ｓｉ系形状記憶合金の加工熱処理方法
JP2004115864A (ja) 2002-09-26 2004-04-15 Hiroshi Kubo 鉄基形状記憶合金
JP3950963B2 (ja) 2002-12-18 2007-08-01 独立行政法人物質・材料研究機構 ＮｂＣ添加Ｆｅ−Ｍｎ−Ｓｉ系形状記憶合金の加工熱処理法
CN1280444C (zh) 2004-04-13 2006-10-18 刘文西 含碳化钒的铁基形状记忆合金及其形状记忆封隔器的应用
RU2270267C1 (ru) 2004-12-30 2006-02-20 Общество с ограниченной ответственностью Производственно-коммерческая фирма "Транс-Евразия" Дисперсионно-твердеющая аустенитная сталь с памятью формы
CN100523263C (zh) 2007-08-06 2009-08-05 大连海事大学 铁基形状记忆合金扣合键及其制造、使用方法
CN101215678B (zh) 2008-01-17 2010-06-09 四川大学 含高温铁素体的免训练铸造铁基形状记忆合金
EP2141251B1 (fr) 2008-06-25 2016-12-28 EMPA Dübendorf Alliages à mémoire de forme à base de fer, de manganèse et de silicium
JP2010156041A (ja) 2008-12-04 2010-07-15 Daido Steel Co Ltd 双方向形状回復合金

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2014146733A1 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111235491A (zh) * 2019-12-27 2020-06-05 西北工业大学 一种高强度高塑性的形状记忆钢及其制备方法
CN111235491B (zh) * 2019-12-27 2022-05-10 西北工业大学 一种高强度高塑性的形状记忆钢及其制备方法

Also Published As

Publication number Publication date
WO2014146733A1 (fr) 2014-09-25
EP2976441B1 (fr) 2019-02-27

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