EP2619343A1 - Corps façonnés en alliages ferreux hautement résistants, plastiquement déformables à température ambiante et absorbant l'énergie mécanique - Google Patents

Corps façonnés en alliages ferreux hautement résistants, plastiquement déformables à température ambiante et absorbant l'énergie mécanique

Info

Publication number
EP2619343A1
EP2619343A1 EP11779110.3A EP11779110A EP2619343A1 EP 2619343 A1 EP2619343 A1 EP 2619343A1 EP 11779110 A EP11779110 A EP 11779110A EP 2619343 A1 EP2619343 A1 EP 2619343A1
Authority
EP
European Patent Office
Prior art keywords
phase
shaped body
elements
body according
volume fraction
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
EP11779110.3A
Other languages
German (de)
English (en)
Other versions
EP2619343B1 (fr
Inventor
Uta KÜHN
Jürgen Eckert
Uwe Siegel
Julia Hufenbach
Min Ha Lee
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.)
Leibnitz-Institut fur Festkorper- und Werkstoffforschung Dresden Ev
Original Assignee
Leibnitz-Institut fur Festkorper- und Werkstoffforschung Dresden Ev
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 Leibnitz-Institut fur Festkorper- und Werkstoffforschung Dresden Ev filed Critical Leibnitz-Institut fur Festkorper- und Werkstoffforschung Dresden Ev
Publication of EP2619343A1 publication Critical patent/EP2619343A1/fr
Application granted granted Critical
Publication of EP2619343B1 publication Critical patent/EP2619343B1/fr
Active 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
    • C22C30/00—Alloys containing less than 50% by weight of each constituent
    • C22C30/04—Alloys containing less than 50% by weight of each constituent containing tin or lead
    • 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
    • C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium 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
    • C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium

Definitions

  • the invention relates to the field of materials science and relates to high-strength, at room temperature plastically deformable and energy absorbing mechanical body of iron alloys.
  • Such moldings can be used as cutting, punching and splitting tools, in the aircraft industry, aerospace, the automotive industry and generally in mechanical and equipment engineering, as well as for extraction tools, such.
  • B. excavator teeth if particularly high demands on the mechanical strength, the surface stress (wear) and in particular the ability to absorb mechanical energy.
  • composition ranges of multicomponent alloys in which such metallic glasses in solid form for. B. with dimensions> 1 mm, can be produced by casting.
  • Such alloys are for.
  • Pd-Cu-Si, Pd 4 oNi 4 oP 2 O, Zr-Cu-Ni-Al, La-Al-Ni-Cu T.Maumumoto: Mater, Sci. Eng. A179 / 1 80 (1994) 8-16 WL Johnson: Mater, Sci. Forum Vol. 225-227, pp. 35-50, Transtec Publications 1996, Switzerland).
  • metallic Fe-base glasses with compositions of the chemical formulas Fe 6 OCo 8 ZrioMo 5W 2 Bi 5, (Fe 0 , 75B 0 , i 5Sio, i) 96Nb, Fe 7 7 Ga 2 P 9,5C 4 B Si 2 , 5 Fe65.5Cr 4 Mo Ga PI2C 5 B 5, 5, 7 Fe Nb 6 Bi 7 Y 3, ([Fe (0, 0 5Co, 5) oj5Bo, 2SiO, o5] 96Nb which> 1 mm can be produced, known A. Inoue, et al: Appl. Phys. Lett 71, 4, (1997) 464-466; A. Inoue, et al: J. Mater.
  • metallic glass moldings having a particularly high glass-forming ability (in dimensions up to 1 2 mm castable with vitreous structure) in the compositions Fe 4 8Cri5Moi 4 Er 2 Ci5B 6 and Ponsambalam, et al: J. Mater, Res., 19, 5, (2004) 1 320-1323; ZP Lu, et al., Phys. Rev. Let., 92, 24, (2004) 245503-1 - 245503-4).
  • the invention has for its object to provide high-strength, plastically deformable at room temperature and mechanical energy absorbing moldings of iron alloys, which have macroscopic plasticity and strain hardening compared to moldings of metallic glasses, without thereby other properties, such as breaking strength or corrosion behavior are significantly impaired, and compared to moldings of amorphous, semi-crystalline or crystalline metallic alloys have a significant increase in strength while having a comparatively high ductility.
  • inventive high-strength, at room temperature plastically deformable and mechanical energy-absorbing shaped body made of iron alloys according to the formula
  • E1 one or more elements of the group B, C, N and O
  • E2 one or more elements of the group Cr, V, Mo, W, Ti, Ta, Zr, Hf and Nb,
  • E4 is one or more elements of the group Sc, Y, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu,
  • ferritic and / or bainitic phases are present.
  • the volume fraction of the martensitic phase is 50 to 70%.
  • the volume fraction of the austenitic phase is 5 to ⁇ 30%, more preferably 10 to 20%.
  • the volume fraction of the boridic and / or carbidic and / or nitridic and / or oxidic phases is 5 to 15% by volume.
  • the alloying elements are mixed, melted and then poured into a mold, wherein the cooling of the alloy in the mold at a rate of> 20 K / s is realized and the cooling rate is chosen depending on the phase composition to be set, with higher cooling rates promote the formation of the martensitic phase.
  • the melting and casting is carried out with the exclusion of oxygen
  • molds having a small thickness of the molded article to be produced are used for realizing the cooling rates, casting molds having a thickness of the molded article of from 1 to 30 mm, still advantageously from 10 to 20 mm or from 12 to 20 mm, being advantageously used.
  • the shaped bodies according to the invention have improved properties compared to shaped bodies made of metallic glasses or of metallic alloys, which were not to be expected due to the sometimes small changes in the composition and / or in the production process.
  • compositions according to the invention and their preparation according to the invention which have the almost infinite number of possible compositions of metallic glasses or crystalline alloys having these advantageous properties. Alloy compositions also close to the compositions according to the invention show markedly poorer properties.
  • the homogeneous microstructure has a relatively high proportion by volume (40 to 80% by volume) of martensitic (tetragonal, body-centered) phase. This high volume fraction of martensitic phase leads to the known properties of iron alloys in general.
  • the volume fraction according to the invention (5 to 35% by volume) of austenitic (kfz-cubic face-centered) phase, and the boridic and / or carbidic and / or nitridic and / or oxidic phases which are still present, then result in markedly improved properties ,
  • the shaped bodies according to the invention are produced according to the invention by mixing the alloy components and then melting.
  • the alloy components and the melting vessel should contain as few additives and impurities as possible.
  • the melt After melting, the melt is poured into a mold.
  • the cooling of the melt in the mold must be realized according to the invention with a cooling rate of> 20 K / s, advantageously between 20 and 200 K / s, so that the microstructure according to the invention can be achieved.
  • the choice of higher cooling rates promotes the formation of the martensitic phase.
  • a protective gas atmosphere for example consisting of argon, is used during melting and casting of the shaped body.
  • the cooling rate of the molten alloy can be controlled by the choice of the size of the mold.
  • the width and length of the casting mold and also of the shaped body to be produced play only a minor role. Decisive for the control of the cooling rate is above all the thickness of the shaped body to be produced. In this case, the smaller the thickness of the shaped body to be produced, the greater the cooling rate. Therefore, the cooling rate can also be controlled with the dimensions of the corresponding mold.
  • Advantageous thicknesses of the shaped bodies to be produced are in the range of 1 to 30 mm, advantageously in the range of 10 to 20 mm or 12 to 20 mm. Accordingly, molds having such dimensions can be selected.
  • such molds made of copper, so-called copper molds.
  • Typical dimensions of such molds are 70 x 120 x 14 mm 3 .
  • the melting of the alloy constituents can furthermore advantageously be carried out in an induction furnace, advantageously also using Al 2 O 3 as the crucible material.
  • the alloy constituents used should advantageously be as free as possible of impurities and additives, and as a result of the melting and casting of the alloy, as few impurities and additives as possible should also be introduced into the melt and thus into the shaped body.
  • the alloy components are advantageously heated to temperatures of 1400-1900 ° C and poured at temperatures between 1400 and 1500 ° C in the mold. Furthermore, it is advantageous that subsequent heat treatments become superfluous as a result of the method according to the invention, since the shaped body according to the invention has its particular mechanical properties already in the cast state.
  • the detection of the austenitic, the martensitic, the boridic and / or carbidic and / or nitridic and / or oxidic phases and the determination of the size and the volume fraction of these phases can be carried out by X-ray diffraction, scanning electron microscopy or transmission electron microscopy.
  • the obtained rectangular shaped body consists of a high-strength, microcrystalline, martensitic (trz) phase, a microcrystalline austenitic (kfz) phase, as well as nano- and microcrystalline carbidic phases of the type MC and M 2 C.
  • the volume fraction of the martensitic phase is 75%, the volume fraction of the austenitic phase is 15% and the volume fraction of the carbidic phases is 10%.
  • the molded article was tested in compression and a technical crushing of 13.6% (true crushing of 15.3%) at a technical breaking strength of 5060 MPa (true breaking strength of 4260 MPa) been determined.
  • the elastic compression at the 0.2% proof stress is 1.3% at a strength of 2480 MPa (techn.) Or 2010 MPa (true).
  • the modulus of elasticity is 212 GPa.
  • a molded body has been produced, which has a good resistance to deformation and a significant increase in strength coupled with good ductility.
  • the obtained rectangular shaped body consists of a high-strength, microcrystalline, martensitic (trz) phase, a microcrystalline austenitic (kfz) phase, as well as nano- and microcrystalline carbidic phases of the type MC and M 2 C.
  • the volume fraction of the martensitic phase is 70%, the volume fraction of the austenitic phase is 18% and the volume fraction of the carbidic phases is 12%.
  • the molding was examined in compression test and a technical crushing of 16.3% (true crushing fracture of 18, 1%) at a technical breaking strength of 4350 MPa (true breaking strength of 3720 MPa) has been determined.
  • the elastic compression at the 0.2% proof stress is 1.2% at a strength of 2140 MPa (techn.) Or 1860 MPa (true).
  • the modulus of elasticity is 217 GPa.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacture Of Metal Powder And Suspensions Thereof (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Powder Metallurgy (AREA)

Abstract

L'invention concerne le domaine des sciences des matériaux et se rapporte à des corps façonnés en alliages ferreux qui peuvent être utilisés comme outils de coupe, de poinçonnage et de fendage, dans l'industrie aéronautique, spatiale et automobile et en général dans la construction mécanique et l'outillage. L'invention a pour but de fournir des corps façonnés en alliages ferreux qui présentent une plasticité et/ou des accroissements de résistance significatifs en même temps qu'une ductilité comparativement élevée. Ce but est atteint par des corps façonnés en alliages ferreux selon la revendication 1. Ce but est également atteint par un procédé selon lequel les éléments d'alliage sont mélangés, fondus et puis coulés dans un moule et sont refroidis à une vitesse >20K/s.
EP11779110.3A 2010-09-24 2011-09-20 Article moulé en alliage de fre à haute résistance méchanique, déformable plastiquement et absorbant de l'énergie méchanique à température ambiante. Active EP2619343B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102010041366A DE102010041366A1 (de) 2010-09-24 2010-09-24 Hochfeste, bei Raumtemperatur plastisch verformbare und mechanische Energie absorbierende Formkörper aus Eisenlegierungen
PCT/EP2011/066283 WO2012048993A1 (fr) 2010-09-24 2011-09-20 Corps façonnés en alliages ferreux hautement résistants, plastiquement déformables à température ambiante et absorbant l'énergie mécanique

Publications (2)

Publication Number Publication Date
EP2619343A1 true EP2619343A1 (fr) 2013-07-31
EP2619343B1 EP2619343B1 (fr) 2014-11-05

Family

ID=44907805

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11779110.3A Active EP2619343B1 (fr) 2010-09-24 2011-09-20 Article moulé en alliage de fre à haute résistance méchanique, déformable plastiquement et absorbant de l'énergie méchanique à température ambiante.

Country Status (4)

Country Link
EP (1) EP2619343B1 (fr)
KR (1) KR101827866B1 (fr)
DE (1) DE102010041366A1 (fr)
WO (1) WO2012048993A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102014217122B4 (de) 2013-08-30 2021-02-25 Leibniz-Institut Für Festkörper- Und Werkstoffforschung Dresden E.V. Zusatzwerkstoff für das Auftragsschweißen
DE102014217369A1 (de) 2014-09-01 2016-03-03 Leibniz-Institut Für Festkörper- Und Werkstoffforschung Dresden E.V. Hochfeste, mechanische energie absorbierende und korrosionsbeständige formkörper aus eisenlegierungen und verfahren zu deren herstellung

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3248866A1 (de) * 1981-06-30 1983-06-16 Foote Mineral Co Bor-legierungszusatz fuer kontinuierliches giessen von borstahl
KR100374980B1 (ko) * 1999-02-12 2003-03-06 히다찌긴조꾸가부시끼가이사 우수한 기계가공성을 갖는 다이스용 고장력강
NO310980B1 (no) * 2000-01-31 2001-09-24 Elkem Materials Fremgangsmate for kornforfining av stal, kornforfiningslegering for stal og fremgangsmate for fremstillingav kornforfiningslegering
DE102006024358B4 (de) * 2006-05-17 2013-01-03 Leibniz-Institut Für Festkörper- Und Werkstoffforschung Dresden E.V. Hochfeste, bei Raumtemperatur plastisch verformbare Formkörper aus Eisenlegierungen

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2012048993A1 *

Also Published As

Publication number Publication date
WO2012048993A1 (fr) 2012-04-19
KR101827866B1 (ko) 2018-02-12
KR20130122627A (ko) 2013-11-07
DE102010041366A1 (de) 2012-03-29
EP2619343B1 (fr) 2014-11-05

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