EP2643488A1 - Verfahren zur wärmebehandlung von hochfesten eisenlegierungen - Google Patents
Verfahren zur wärmebehandlung von hochfesten eisenlegierungenInfo
- Publication number
- EP2643488A1 EP2643488A1 EP11791234.5A EP11791234A EP2643488A1 EP 2643488 A1 EP2643488 A1 EP 2643488A1 EP 11791234 A EP11791234 A EP 11791234A EP 2643488 A1 EP2643488 A1 EP 2643488A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- strength
- cooling rates
- advantageously
- strength iron
- iron alloys
- 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.)
- Withdrawn
Links
Classifications
-
- 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
- C21D6/002—Heat treatment of ferrous alloys containing Cr
-
- 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
- C21D1/78—Combined heat-treatments not provided for above
- C21D1/785—Thermocycling
-
- 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
- C21D5/00—Heat treatments of cast-iron
-
- 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
- C21D6/02—Hardening by precipitation
-
- 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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/22—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for drills; for milling cutters; for machine cutting tools
-
- 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
- C22C38/005—Ferrous alloys, e.g. steel alloys containing rare earths, i.e. Sc, Y, Lanthanides
-
- 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
-
- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/008—Martensite
Definitions
- the present invention relates to the field of materials science and relates to a method for the heat treatment of high-strength iron alloys.
- Shaped bodies of such iron alloys can be used as cutting, stamping and forming tools, in the automotive industry, in mechanical and tool engineering, in the aircraft industry, as well as in conveyor technology for.
- excavator teeth when a particularly high strength in combination with a good ductility is required.
- a disadvantage of the solutions of the prior art is that after the production of iron alloys their hardness, strength and deformability are not sufficiently high.
- the object of the invention is to provide a method for heat treatment of high-strength iron alloys, with which both the hardness and the strength under tensile and compressive stresses and the deformability of the iron alloys can be significantly increased, and to provide a high-strength iron alloy, which improved them Features.
- the object is achieved by the invention specified in the claims.
- Advantageous embodiments are the subject of the dependent claims.
- the alloying elements are mixed, melted and then poured into a casting mold, the cooling of the alloy in the casting mold being realized at a speed of at least 10 K / s and the cooling rate depending on the phase composition to be set wherein higher cooling rates promote the formation of the martensitic phase, subsequently the casting is annealed at least twice immediately after one another, the tempering temperatures being between 500 and 600 ° C, the holding times for tempering between 30 seconds and 15 minutes and the heating and Cooling rates are at least 15 K / min.
- At least the melting and casting is carried out under oxygen termination.
- the annealing is carried out under oxygen exclusion, even more advantageously under an argon atmosphere.
- cooling rates during casting are from 20 K / s to 1000 K / s, more preferably from 100 to 200 K / s, and / or the heating and cooling rates during annealing from 15 K / min to 100 K / min , still advantageously from 20 to 80 K / min realized.
- tempering temperatures between 520 ° C and 580 ° C are used. It is also advantageous if holding times of one or more starting phases between 1 and 4 minutes are realized.
- the high-strength iron alloy according to the invention contains according to the formula
- E1 one or more elements of group B, C, N and 0,
- E2 is one or more elements of the group Cr, V, Mo, W, Ti, Ta, Zr, Hf and Nb,
- E4 one or more elements of the group Sc, Y, La, Ce, Pr, Nd, Pm,
- the structure of the high-strength iron alloy has a homogeneous microstructure consisting of
- ferritic and / or bainitic phases are present.
- Such an iron alloy having this homogeneous microstructure is then tempered at least twice, with tempering temperatures of between 500 and 600 ° C, holding times of between 30 seconds and 15 minutes, and heating and cooling rates of at least 20 K / min.
- melting and casting are carried out under exclusion of oxygen, advantageously under an argon atmosphere.
- the casting molds In order to be able to realize the cooling rates during casting, the casting molds have to be of significantly greater thickness than the casting molds to be produced.
- the mold body advantageously have a thickness of 1 to 30 mm, more preferably 10 to 20 mm or 12 to 20 mm.
- Such molds are, for example, copper molds with corresponding dimensions of the molding to be cast.
- the high-strength iron alloy according to the invention which has been produced according to the invention, exhibits particularly good mechanical properties, such as hardnesses of up to 65 HRC, strengths of more than 4000 MPa and compressions of more than 25%.
- the heat treatment according to the invention takes place at the tempering temperatures at which the secondary hardness maximum of the alloy produced in each case is.
- phase composition of the homogeneous microstructure significantly improved properties are achieved.
- strength under tensile and compressive stresses and deformability of the iron alloys according to the invention advantageously also a high wear resistance and heat resistance are achieved.
- Fig. 1 a schematic representation of a three-stage Kurzzeitanlassregimes
- a microstructure is achieved, consisting of 95 vol .-% martensitic phase and 5% by volume of nano- and microcrystalline carbide phase of the MC and M 2 C type.
- the high-strength iron alloy according to the invention exhibits an increased compressive strength of 4000 MPa, a technical crushing rate of 30%, a 0.2 compression limit of 2800 MPa and a tensile strength of 2000 MPa and a hardness of 65 HRC which is significantly higher than the initial state.
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE201010062011 DE102010062011B3 (de) | 2010-11-26 | 2010-11-26 | Verfahren zur Wärmebehandlung von hochfesten Eisenlegierungen |
PCT/EP2011/070021 WO2012069329A1 (de) | 2010-11-26 | 2011-11-14 | Verfahren zur wärmebehandlung von hochfesten eisenlegierungen |
Publications (1)
Publication Number | Publication Date |
---|---|
EP2643488A1 true EP2643488A1 (de) | 2013-10-02 |
Family
ID=44924952
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP11791234.5A Withdrawn EP2643488A1 (de) | 2010-11-26 | 2011-11-14 | Verfahren zur wärmebehandlung von hochfesten eisenlegierungen |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP2643488A1 (de) |
KR (1) | KR101893888B1 (de) |
DE (1) | DE102010062011B3 (de) |
WO (1) | WO2012069329A1 (de) |
Families Citing this family (4)
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 |
WO2015054637A1 (en) * | 2013-10-10 | 2015-04-16 | Scoperta, Inc. | Methods of selecting material compositions and designing materials having a target property |
DE102015207922A1 (de) | 2015-04-29 | 2016-11-03 | Takraf Gmbh | Hartkörper als Rasterpanzerung für eine Rollenpresse, Verfahren zur dessen Herstellung, und Rolle für eine Rollenpresse |
CN105200301B (zh) * | 2015-11-04 | 2017-09-19 | 中国矿业大学 | 高强铁基合金的制备方法及高强铁基合金截齿 |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3413166A (en) * | 1965-10-15 | 1968-11-26 | Atomic Energy Commission Usa | Fine grained steel and process for preparation thereof |
EP0714990A1 (de) * | 1990-06-06 | 1996-06-05 | Nkk Corporation | Verfahren zum Herstellen abriebfester Stähle |
DE69125833T2 (de) * | 1991-08-12 | 1997-08-07 | Nippon Kokan Kk | Verfahren zur Herstellung abriebfester Stähle |
US6669790B1 (en) * | 1997-05-16 | 2003-12-30 | Climax Research Services, Inc. | Iron-based casting alloy |
DE10037363A1 (de) * | 2000-07-31 | 2002-02-14 | Manfred Markworth | Eisenbasis-Gußlegierung mit verschleißhemmenden Zusätzen für die vorzugsweise Verwendung als Werkstoff für Walzen |
DE102004037067B3 (de) * | 2004-07-30 | 2006-01-05 | Ab Skf | Verfahren zur Wärmebehandlung von Werkstücken aus Stahl |
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 |
-
2010
- 2010-11-26 DE DE201010062011 patent/DE102010062011B3/de active Active
-
2011
- 2011-11-14 EP EP11791234.5A patent/EP2643488A1/de not_active Withdrawn
- 2011-11-14 WO PCT/EP2011/070021 patent/WO2012069329A1/de active Application Filing
- 2011-11-14 KR KR1020137016712A patent/KR101893888B1/ko active IP Right Grant
Non-Patent Citations (1)
Title |
---|
See references of WO2012069329A1 * |
Also Published As
Publication number | Publication date |
---|---|
DE102010062011B3 (de) | 2011-12-01 |
KR20130121894A (ko) | 2013-11-06 |
WO2012069329A1 (de) | 2012-05-31 |
KR101893888B1 (ko) | 2018-08-31 |
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Legal Events
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Effective date: 20130619 |
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DAX | Request for extension of the european patent (deleted) | ||
17Q | First examination report despatched |
Effective date: 20160302 |
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RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: ECKERT, JUERGEN Inventor name: HUFENBACH, JULIA KRISTIN Inventor name: KOHLAR, STEFANIE Inventor name: KUEHN, UTA |
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STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
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18D | Application deemed to be withdrawn |
Effective date: 20170601 |