EP1939308A1 - Procédé de fabrication d'un composant par trempe de compression thermique et composant haute résistance présentant une amélioration de l'allongement de rupture - Google Patents

Procédé de fabrication d'un composant par trempe de compression thermique et composant haute résistance présentant une amélioration de l'allongement de rupture Download PDF

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Publication number
EP1939308A1
EP1939308A1 EP07119115A EP07119115A EP1939308A1 EP 1939308 A1 EP1939308 A1 EP 1939308A1 EP 07119115 A EP07119115 A EP 07119115A EP 07119115 A EP07119115 A EP 07119115A EP 1939308 A1 EP1939308 A1 EP 1939308A1
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EP
European Patent Office
Prior art keywords
component
sheet metal
metal part
hot
hot press
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Withdrawn
Application number
EP07119115A
Other languages
German (de)
English (en)
Inventor
Horst Berndsen
Jian Dr.-Ing. Bian
Franz-Josef Dr.-Ing. Lenze
Sascha Sikora
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 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 AG filed Critical ThyssenKrupp Steel AG
Publication of EP1939308A1 publication Critical patent/EP1939308A1/fr
Withdrawn legal-status Critical Current

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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
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/18—Hardening; Quenching with or without subsequent tempering
    • C21D1/185—Hardening; Quenching with or without subsequent tempering from an intercritical temperature
    • 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
    • C21D1/62—Quenching devices
    • C21D1/673—Quenching devices for die quenching
    • 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
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing 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
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • 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

Definitions

  • the invention relates to a method for producing a high-strength component with improved elongation at break by hot press hardening and a high-strength component with improved elongation at break and toughness.
  • the blanks are heated to a forming temperature and placed in the heated condition in the tool of a forming press.
  • the sheet metal blank or the component formed from it undergoes a rapid cooling due to the contact with the cool tool, resulting in hardened structure in the component.
  • the rapid cooling can be assisted by actively cooling the tool itself.
  • a steel comparable to steel 22MnB5 is made of JP 2006104526 A known.
  • This known steel contains in addition to Fe and unavoidable impurities (in wt .-%) 0.05 - 0.55% C, max. 2% Si, 0.1-3% Mn, max. 0.1% P and max. 0.03% S.
  • additional amounts of 0.0002 - 0.005% B and 0.001 - 0.1% Ti can be added to the steel.
  • the respective Ti content serves for setting the nitrogen present in the steel. In this way, the boron present in the steel can develop its strength-increasing effect as completely as possible.
  • the JP 2006104526 A be produced from the composite steel thus first sheets, which are then preheated to above the Ac 3 temperature, typically in the range of 850 - 950 ° C, lying temperature.
  • the martensitic microstructure ensuring the desired high strengths is formed in the component molded from the respective sheet metal blank.
  • the sheet metal parts heated to the stated temperature level can be shaped to complex-shaped components at relatively low forming forces. This is especially true for such sheet metal parts, which are made of high-strength steel and provided with a corrosion protection coating.
  • the invention was therefore based on the object to provide a method which allows to produce complex shaped steel components, on the one hand have a sufficiently high strength and good elongation at break and on the other hand, a sufficient toughness, in order to meet the demands placed on them in practice to suffice.
  • a component should be specified whose range of properties on the one hand under normal conditions a high dimensional stability and on the other hand in an accident ensures a high energy absorption capacity.
  • the invention is based on the basic idea of avoiding complete martensite hardening of the component during press hardening. Instead, according to the invention, a mixed structure is produced in the component to be produced according to the invention, which on the one hand ensures surprisingly high strength and, on the other hand, high elongation values and a toughness of the component according to the invention which is adequate for the respective application.
  • sheet metal parts are hot press-hardened, which are produced from a steel which is known per se with regard to its composition.
  • Its alloy contents (C: 0.10-0.45%, Si: 0.05-0.50%, Mn: 0.8-1.7%, Cr: 0.05-0.6%, P: max 0.015%, S: 0.003% maximum, and optionally one or more of the following alloying elements Al: 0.01-0.05%, N: 0.002-0.005%, Ti: 0.01-0.1%, B: 0.0008 - 0.008%, remainder iron and unavoidable impurities, data in wt .-%) are coordinated so that it inherently has a high strength potential.
  • the sheet metal part made of this steel according to the invention is heated only to a temperature at which the austenitization is not yet completed. Rather, a heating temperature is selected according to the invention for the press hardening, which is between the for the Ac 1 and Ac 3 temperatures determined for each steel (Ac 1 temperature: temperature at which the transformation into austenite begins; Ac 3 temperature: temperature at which the transformation to austenite is completed). At these heating temperatures, the sheet processed in each case has a mixture of austenite and ferrite.
  • the heating of the sheet metal parts according to the invention is always controlled so that present after heating in the sheet metal part ferrite and austenite side by side.
  • the respective size of the proportions of ferrite and austenite can be controlled via the heating temperature.
  • the austenitic microstructure converts to martensite.
  • This Martensitanteil ensures in the finished component for the high Strength.
  • the ferrite content present in the metal sheet after heating is still retained in the component even after the press-hardening and ensures the desired high elongation at break and improved toughness.
  • the carbon content in austenite at sectionaustenitmaschine invention is each significantly higher than the total carbon content of the steel (for example, in a microstructure with 50% each austenite and 50% ferrite, the C content of austenite about twice as high as the C content of Total of steel), the austenite remains substantially stable until press hardening. This enables safe process control during press hardening.
  • the formation of the proportions of martensite is influenced directly by the choice of a suitable heating temperature. Heating temperatures lying close to the Ac 3 temperature lead in the finished component to larger martensite proportions and thus higher strength, while particularly good elongation values can be achieved by lower heating temperatures close to the Ac 1 temperature.
  • the elongation characteristics of a component produced according to the invention are always greater than the corresponding components Values that can be determined for a manufactured in a known manner component with vollmartenitInstitutem microstructure.
  • high-strength components can easily and purposefully be produced whose elongation at break is up to twice greater than the breaking elongation of a component produced in a known manner.
  • the invention thus provides a possibility for the practical use of which machines are required that are less expensive than the hitherto known variants of hot forming and thus trigger lower procurement and maintenance costs.
  • the savings are achieved not only by the significantly reduced demands on the heat source required for the heating of the sheet metal part, but also by the lower requirements that are placed on the forming tool.
  • inventively lower temperatures of the cooling effort in the tool is minimized.
  • components produced according to the invention may be trimmed with conventional cutting tools depending on the strength class. The expensive laser cutting of the components obtained can be omitted.
  • a particular advantage of the invention consists in the fact that it is possible to produce components in the procedure according to the invention which have an optimum combination of strength and ductility.
  • the invention offers a further potential savings.
  • hot-press hardened components have a strength level equivalent to that of conventionally press-hardened and subsequently annealed at temperatures of 300-400 ° C with fully martensitic structure.
  • the elongation values of components produced according to the invention are significantly higher than those of the conventionally press-hardened and tempered components. Therefore, with the product produced according to the invention, with a minimized production outlay, a component is available that possesses a combination of high strengths and very good elongation properties that is superior to the state of the art.
  • the inventive method is suitable for processing sheet metal parts, which are obtained from hot or cold rolled steel strips.
  • the steel strips in question may be subjected to a surface refinement before the hot press hardening carried out according to the invention.
  • they can be, for example, hot-dip aluminized (eg coating with an AlSi (AS) or AlZn layer (AZ)), hot-dip galvanized (eg coating with a simple zinc (Z), a zinc iron ( ZF) or a zinc aluminum layer (ZA)) or with an organic-inorganic coating (eg a lacquer coating which on the one hand provides corrosion protection and on the other hand improves the tribological properties of the blank during press hardening).
  • an organic-inorganic coating eg a lacquer coating which on the one hand provides corrosion protection and on the other hand improves the tribological properties of the blank during press hardening.
  • the use of surface-treated sheet-metal parts has the advantage, especially when carrying out hot-pressing curing, that
  • the hot molding press hardening can be carried out directly or indirectly.
  • direct hot molding press hardening a board is used as the sheet metal part, which is heated in the manner according to the invention and from which then directly, d. H. Without further deformation steps, the respective component is formed.
  • indirect hot-pressing hardening an arbitrarily shaped sheet-metal part is preformed in at least one step from a sheet metal blank. This preformed sheet metal part is then heated in accordance with the invention and receives its final shape during the subsequent hot-press forming step.
  • thermosetting sheet metal part may be followed by cooling to the entry into the hot press tool so that with the onset of the forming process in the sheet metal part in each case with regard to the respective work result optimal temperature is.
  • This cooling can take place, for example, in the course of workpiece transfer from the heating device to the pressing tool in air or under a protective gas, by which a scaling of the surface of the sheet metal part to be prevented.
  • a component according to the invention is characterized in that it consists of a steel which, in addition to iron and unavoidable impurities (in% by weight) C: 0.10-0.45%, Si: 0.05-0.50%, Mn: 0, 8-1.7%, Cr: 0.05-0.6%, P: max. 0.015%, S: max. 0.003%, and optionally one or more of the following alloying elements A1: 0.01-0.05%, N: 0.002-0.005%, Ti: 0.01-0.1%, B: 0.0008-0.008% , wherein the component has a mixed structure with proportions of ferrite and martensite and at a breaking elongation A80 of 6 - 14% has a tensile strength of 800 - 1500 MPa.
  • the proportions of martensite and ferrite in the structure of the component according to the invention are coordinated so that it has a tensile strength of 800 - 1100 MPa.
  • Such a component fulfills most of the requirements in practice in terms of its strength and at the same time has an optimized toughness.
  • An inventive component optimally adjusted by adjusting the corresponding proportions of martensite and ferrite in accordance with the invention is characterized in that its breaking elongation A80 is in the range of 10-14%.
  • components according to the invention are suitable in particular for use as parts of vehicle bodies.
  • components according to the invention can be easily formed so that they can be used as crash-relevant components in an automobile body, on the one hand ensure sufficient rigidity of the respective body, but at the same time in a position should be to convert the sudden kinetic energy in an accident safely into deformation energy.
  • Way preferably bumper reinforcements, A-, B-, C- and D-pillars as well as for these columns certain reinforcements, sills, roof frames, side members, tunnel reinforcements, side impact absorbers and mounting plates for automobile bodies produce.
  • components according to the invention are particularly preferably produced by the process according to the invention.
  • This not only allows the simple adaptation of the property profile of the respective component to its intended use, but allows the sheet metal parts before their hot press hardening according to the invention only to a low compared to the prior art heating temperature, a particularly cost-effective production of high-strength components with a toughness , which is clearly superior to that of conventionally produced, purely martensitic components.
  • the components produced according to the invention also have a high bake hardening potential due to the composition of the steel used according to the invention and the special processing path, which enables an additional increase in the strength of components according to the invention.
  • the attached diagram is schematically the underlying principle of the inventive method shown.
  • a section of the iron-carbon diagram prepared for a manganese-boron steel is shown, while on the right side of the diagram, the temperature profile over the respective steps of the method according to the invention can be seen.
  • the respective sheet metal part is first heated within a time t1 to a heating temperature TE lying between the Ac 1 and the Ac 3 temperature of the carbon content X-containing steel from which it is produced. Subsequently, it is kept at the heating temperature TE over a time t2 sufficient for the desired partial austenitization.
  • the hot-rolled strip can be produced by fire aluminizing (AS, AZ), hot-dip galvanizing (Z, ZF, ZA) and / or organic-inorganic coating with a be provided against corrosion protective coating or oxidation.
  • AS, AZ fire aluminizing
  • Z, ZF, ZA hot-dip galvanizing
  • organic-inorganic coating with a be provided against corrosion protective coating or oxidation.
  • cold rolling is first carried out, which is preferably carried out without intermediate annealing, wherein the degree of cold rolling should be more than 40%.
  • the resulting cold strip can then also be provided in the manner already described for the hot strip with a protective against corrosion or oxidation coating.
  • sheet metal blanks are divided.
  • the sheet metal blanks are then heated to a heating temperature between the Ac 1 and Ac 3 temperatures.
  • the sheet metal blanks After air cooling by a small amount of temperature in the course of the transfer of the sheet metal blank from the respective heating furnace into the die, the sheet metal blanks are placed in the hot pressing tool in which they are formed into the component and at the same time cooled so rapidly, that the austenite present after heating in its structure completely converts into martensite except for small residual austenite contents.
  • the inventive method has been tested on a sheet metal part, which has been divided as a flat-shaped board of a cold strip produced in the manner described above from the known 22MnB5 steel.
  • the 22MnB5 steel typically contains (in wt%) 0.240% C, 1.3% Mn, 0.25% Si, max. 0.02% P, max. 0.005% S, 0.035% Al, 0.035% Ti, 0.155% Cr, 0.003% B and max. 0.1% of Mo, Cu and Ni, balance iron and unavoidable impurities.
  • the correspondingly assembled sheet metal part has been heated in an oven to a heating temperature of 780 ° C, in which there was a mixed structure of austenite / ferrite in the sheet metal part. Subsequently, the sheet metal part has been inserted by means of a conveyor in an actively cooled mold. During the transfer from the oven to the die, only a small amount of heat loss occurred, resulting in a temperature decrease of less than 5 ° C.
  • the sheet metal part has been deformed into a component intended for an automobile body. Due to the intense contact of the sheet metal part with the compression mold that occurred during the compression deformation, cooling was accompanied by the compression deformation, whose cooling rate was comparable to a quenching of the sheet metal part in an oil bath.
  • the automobile body component obtained according to the invention after hot press-hardening had a mixed structure consisting of 63% ferrite, 30% martensite and 7% retained austenite.
  • the final strength determined for the component was 900 MPa, while its elongation at break A80 was 13%.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
EP07119115A 2006-11-14 2007-10-23 Procédé de fabrication d'un composant par trempe de compression thermique et composant haute résistance présentant une amélioration de l'allongement de rupture Withdrawn EP1939308A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102006053819A DE102006053819A1 (de) 2006-11-14 2006-11-14 Verfahren zum Herstellen eines Bauteil durch Warmpresshärten und hochfestes Bauteil mit verbesserter Bruchdehnung

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Publication Number Publication Date
EP1939308A1 true EP1939308A1 (fr) 2008-07-02

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EP07119115A Withdrawn EP1939308A1 (fr) 2006-11-14 2007-10-23 Procédé de fabrication d'un composant par trempe de compression thermique et composant haute résistance présentant une amélioration de l'allongement de rupture

Country Status (2)

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EP (1) EP1939308A1 (fr)
DE (1) DE102006053819A1 (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009056443A1 (de) * 2009-12-02 2011-06-09 Benteler Automobiltechnik Gmbh Crashbox und Verfahren zu deren Herstellung
EP2719787B1 (fr) 2011-06-10 2016-04-13 Kabushiki Kaisha Kobe Seiko Sho Article moulé par pressage à chaud, procédé pour produire celui-ci, et tôle d'acier mince pour moulage à la presse à chaud
JPWO2014196645A1 (ja) * 2013-06-07 2017-02-23 新日鐵住金株式会社 熱処理鋼材及びその製造方法
WO2018099819A1 (fr) 2016-11-29 2018-06-07 Tata Steel Ijmuiden B.V. Procédé de fabrication d'un article formé à chaud, et article obtenu
CN110144439A (zh) * 2014-11-18 2019-08-20 安赛乐米塔尔公司 用于制造高强度钢产品的方法和由此获得的钢产品
CN113512679A (zh) * 2021-04-20 2021-10-19 攀钢集团攀枝花钢铁研究院有限公司 高延伸率高强度热镀锌钢板及其生产方法
CN115354211A (zh) * 2022-08-16 2022-11-18 酒泉钢铁(集团)有限责任公司 一种用薄带铸轧工艺生产耐蚀抗氧化1500MPa热成型钢的方法

Families Citing this family (7)

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Publication number Priority date Publication date Assignee Title
DE102008022399A1 (de) * 2008-05-06 2009-11-19 Thyssenkrupp Steel Ag Verfahren zum Herstellen eines Stahlformteils mit einem überwiegend ferritisch-bainitischen Gefüge
DE102008051992B4 (de) * 2008-10-16 2011-03-24 Benteler Automobiltechnik Gmbh Verfahren zur Herstellung eines Werkstücks, Werkstück und Verwendung eines Werkstückes
DE102008055514A1 (de) * 2008-12-12 2010-06-17 Thyssenkrupp Steel Europe Ag Verfahren zur Herstellung eines Bauteils mit verbesserten Bruchdehnungseigenschaften
DE102011001140A1 (de) 2011-03-08 2012-09-13 Thyssenkrupp Steel Europe Ag Stahlflachprodukt, Verfahren zum Herstellen eines Stahlflachprodukts und Verfahren zum Herstellen eines Bauteils
EP2664682A1 (fr) * 2012-05-16 2013-11-20 ThyssenKrupp Steel Europe AG Acier destiné à la fabrication d'un composant en acier, produit plat en acier en étant constitué, composant en étant issu et leur procédé de fabrication
DE102015111177A1 (de) * 2015-07-10 2017-01-12 Salzgitter Flachstahl Gmbh Höchstfester Mehrphasenstahl und Verfahren zur Herstellung eines kaltgewalzten Stahlbandes hieraus
US20250346981A1 (en) 2024-05-13 2025-11-13 GM Global Technology Operations LLC Tailor-rolled blank for use in hot stamping automotive parts, and method of making hot stamped automotive parts

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EP1767659A1 (fr) * 2005-09-21 2007-03-28 ARCELOR France Procédé de fabrication d'une pièce en acier de microstructure multi-phasée
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Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009056443A1 (de) * 2009-12-02 2011-06-09 Benteler Automobiltechnik Gmbh Crashbox und Verfahren zu deren Herstellung
EP2719787B1 (fr) 2011-06-10 2016-04-13 Kabushiki Kaisha Kobe Seiko Sho Article moulé par pressage à chaud, procédé pour produire celui-ci, et tôle d'acier mince pour moulage à la presse à chaud
JPWO2014196645A1 (ja) * 2013-06-07 2017-02-23 新日鐵住金株式会社 熱処理鋼材及びその製造方法
CN110144439A (zh) * 2014-11-18 2019-08-20 安赛乐米塔尔公司 用于制造高强度钢产品的方法和由此获得的钢产品
CN110144439B (zh) * 2014-11-18 2021-11-12 安赛乐米塔尔公司 用于制造高强度钢产品的方法和由此获得的钢产品
US12503739B2 (en) 2014-11-18 2025-12-23 Arcelormittal Method for manufacturing a high strength steel product and steel product thereby obtained
WO2018099819A1 (fr) 2016-11-29 2018-06-07 Tata Steel Ijmuiden B.V. Procédé de fabrication d'un article formé à chaud, et article obtenu
EP3548641B1 (fr) 2016-11-29 2020-08-26 Tata Steel IJmuiden B.V. Procédé de fabrication d'un article formé à chaud et article ainsi obtenu
CN113512679A (zh) * 2021-04-20 2021-10-19 攀钢集团攀枝花钢铁研究院有限公司 高延伸率高强度热镀锌钢板及其生产方法
CN115354211A (zh) * 2022-08-16 2022-11-18 酒泉钢铁(集团)有限责任公司 一种用薄带铸轧工艺生产耐蚀抗氧化1500MPa热成型钢的方法
CN115354211B (zh) * 2022-08-16 2023-07-18 酒泉钢铁(集团)有限责任公司 一种用薄带铸轧工艺生产耐蚀抗氧化1500MPa热成型钢的方法

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