EP3625048A1 - Matériau de formage à chaud, pièce et utilisation correspondante - Google Patents

Matériau de formage à chaud, pièce et utilisation correspondante

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Publication number
EP3625048A1
EP3625048A1 EP18724548.5A EP18724548A EP3625048A1 EP 3625048 A1 EP3625048 A1 EP 3625048A1 EP 18724548 A EP18724548 A EP 18724548A EP 3625048 A1 EP3625048 A1 EP 3625048A1
Authority
EP
European Patent Office
Prior art keywords
forming material
hot
steel
hot forming
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.)
Withdrawn
Application number
EP18724548.5A
Other languages
German (de)
English (en)
Inventor
Jens-Ulrik Becker
Stefan Myslowicki
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
ThyssenKrupp AG
Original Assignee
ThyssenKrupp Steel Europe AG
ThyssenKrupp 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, ThyssenKrupp AG filed Critical ThyssenKrupp Steel Europe AG
Publication of EP3625048A1 publication Critical patent/EP3625048A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/01—Layered products comprising a layer of metal all layers being exclusively metallic
    • B32B15/011—Layered products comprising a layer of metal all layers being exclusively metallic all layers being formed of iron alloys or steels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/18—Layered products comprising a layer of metal comprising iron or steel
    • 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
    • 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
    • C22C38/06—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
    • 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
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
    • C23C2/12—Aluminium or alloys based thereon
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
    • C23C28/02—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings only including layers of metallic material
    • C23C28/021—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings only including layers of metallic material including at least one metal alloy layer

Definitions

  • the invention relates to a hot forming material of a five-layer composite material.
  • Lightweight construction is an essential element in reducing vehicle weight. This can be achieved, inter alia, by the use of materials with increased strength. As the strength increases, its bending capacity tends to decrease. In order to ensure the occupant protection required for crash-relevant components despite increased strength to realize lightweight construction, it must be ensured that the materials used can convert the energy introduced by a crash by deformation. This requires a high degree of formability, especially in the crash-relevant components of a vehicle structure.
  • One way to save weight for example, the body and / or the chassis of a land-based vehicle even easier to design or build by innovative materials compared to the conventionally used materials.
  • component-specific conventional materials can be replaced by materials with thinner wall thicknesses with optimized properties.
  • more and more hybrid materials or composites find their way into the automotive industry, which are composed of two or more different materials, each individual material has certain, partly opposing properties, which are combined in the composite material to composite material in comparison to the individual, monolithic materials to achieve improved properties.
  • Composite materials, in particular composed of different steels are known in the art, for example from the German patent application DE 10 2008 022 709 AI or from the European patent application EP 2 886 332 AI.
  • a steel composite designed for hot forming is marketed by the Applicant under the trade names "Tribond®” 1200 and 1400.
  • a high strength hardenable steel core layer and a ductile steel top layer in different material thicknesses are used to achieve the high strength target
  • a high material thickness of the ductile composite partner is provided. This reduces the strength of the composite material in two ways: firstly, it is the ductile portion itself that leads to it, secondly, the strength of the core is lowered because during production (hot roll plating) and processing (hot working) diffusion flows of the alloying elements between the composite partners occur.
  • the use of thin cover layers achieves a high overall strength, the diffusion processes lead to a comparatively strong hardening of the ductile composite partner, so that the ductility objectives can not be achieved at the end.
  • the abovementioned steel-material composites are cut into blanks and heated to austenitizing temperature, in order to subsequently heat-form and cool them in a cooled mold at the same time.
  • intensive cooling cooling rates of at least 27 K / s are required when using a 22MnB5 as a core layer, the structure of austenite completely converts into martensite and the material processed into the component receives its desired high strength in the core layer in the press-hardened state.
  • This process is also known in the art as press hardening.
  • the steel material composites used for this purpose are, for example, provided with an aluminum-based coating, in particular an AlSi coating, in order to avoid unwanted scale formation when the board is heated to austenitizing temperature.
  • the design of the steel material composite for hot forming was previously based on the mechanical properties.
  • a disadvantage is the carburization of the outer layers during manufacture for composite material and during hot forming, which leads to an unsatisfactory strength or ductility of the composite materials due to the chemical composition of the composite partners.
  • the object of the present invention is to provide a hot-forming material which undergoes essentially no to low carburization of the outer layers during production and (further) processing.
  • Claim l In order to avoid the described problem with respect to the carburization of the outer layers and to achieve a high overall strength of a composite material with simultaneously high residual ductility, it is necessary to substantially suppress the access of carbon from the core layer into the cover layer in a suitable form. This can be achieved by a hot-forming material according to the invention from a five-ply composite material having a construction of a ply-liner-ply-liner ply-liner ply.
  • the intermediate layer serves as a separating layer substantially for suppressing the diffusion flow between the core and cover layers, while on the other hand it contributes to ensuring sufficient ductility of the hot-forming material.
  • the release effect is based on the fact that diffusing carbon from the core layer essentially bonds near the surface with correspondingly affine alloy elements of the intermediate layer, such as, for example, chromium in the form of chromium carbides.
  • the separation effect of the intermediate layer can be enhanced by a conversion-free, ferritic (cubic-body-centered) or austenitic (cubic-face-centered) lattice structure with corresponding carbon solubility.
  • the top layer used Another contribution to the ductility is provided by the top layer used. This has as an additional function a shielding of the separating layer from the environment, so that in later use, the combination of a component of a hot forming material according to the invention with a component, such as a conventional steel, not to form a galvanic element and thus to an increased corrosion attack on the component made of conventional steel.
  • the five-layer hot forming material comprises a core layer of a hardenable steel having a carbon content C of at least 0.2 wt .-%, two cohesively bonded to the core layer intermediate layers of a steel with a chromium content Cr of at least 2 wt .-%, which is a cubic Have space-centered or cubic face-centered lattice structure, and in each case on the outer sides of the intermediate layers a cohesively connected to the intermediate layer cover layer of a steel with a coal st off share C of 0.25 wt .-% maximum.
  • the hot-forming material can be designed as a strip, plate or sheet metal or can be made available to the further process steps.
  • the hot forming material can thus be integrated into existing standard processes of hot forming without having to make any changes in the process chain.
  • the Cr-alloyed steel of the intermediate layers of the hot-forming material consists of Fe and production-related unavoidable impurities in% by weight
  • V up to 1%.
  • C is at most 0.35 wt .-%, in particular at most 0.20 wt .-%, preferably at most 0, 15 wt .-%, more preferably at most 0, 10 wt .-% before.
  • Si and Al are each present at a maximum of 2 wt .-%, in particular at most 1.5 wt .-%, preferably at most 1 wt .-%, more preferably at most 0.5 wt .-%, in particular to promote the weldability.
  • AI and / or Si may also be included only as an impurity and / or normal companion.
  • Mn is limited to not more than 2% by weight, in particular not more than 1.5% by weight, preferably not more than 1% by weight, more preferably not more than 0.8% by weight, and may contain at least 0.01% by weight .-% positively influence the adjustment of the strength.
  • Cr is a ferrite former and serves to bind diffusing C from the core layer and is present in at least 2% by weight, in particular at least 8% by weight, preferably at least 10.5% by weight, and is not more than 30% by weight. %, in particular at most 27 wt .-%, preferably at most 25 wt .-% limited.
  • Ni is an austenite former and may contribute to increasing strength and ductility and may be present at a level of at most 26% by weight, especially at most 18% by weight, preferably at most 12% by weight. To ensure a stable austenitic lattice structure (cubic-face-centered lattice structure), a proportion of at least 8.5% by weight should not be undercut.
  • Mo is at a maximum of 7 wt .-% and can be further limited in particular to a maximum of 3 wt .-%, preferably at most 1 wt .-%, since in the intermediate layers no corrosion protection is required. With a content of at least 0.01% by weight, Mo can positively influence the strength.
  • the alloying elements are each limited to a maximum of 1 wt .-%, and in particular in the range from 0.1 to 2.0% by weight, preferably 0.25 to 1.5% by weight and particularly preferably 0.3 to 1.2% by weight, based on the total amount of Ti, Nb, Zr and V, lies.
  • the Cr-alloyed steel it is not necessary for the Cr-alloyed steel to contain all four of the mentioned alloying elements, but it is also possible that the content results only from one, two or three of said alloying elements.
  • the elements Ti, Nb, Zr and V by virtue of their preferred binding to N over Cr, ensure that the ferrite-forming free Cr content is not reduced by nitride formation.
  • Exemplary representatives of Cr-alloyed steels are commercial steels of the group designated 1.4XXX, with a conversion-free, ferritic (body-centered cubic) microstructure, for example 1.4509, 1.4510, 1.4511 or 1.4613 or with a conversion-free, austenitic (cubic-face centered) microstructure for example, 1.4306, 1.4577 or 1.4541.
  • the hardenable steel of the core layer of the hot-forming material consists of Fe and production-related unavoidable impurities in% by weight
  • C is a strength-increasing alloying element and contributes to an increase in strength to increase the strength, so that a content of at least 0.2 wt .-%, in particular of at least 0.28 wt .-%, preferably of at least 0.33 wt .-%, more preferably at least 0.37 wt .-%, particularly preferably at least 0.42 wt .-% is present in order to achieve or set the desired strength.
  • the brittleness increases, so that the content to a maximum of 0.8 wt .-%, in particular at most 0.75 wt .-%, preferably at most 0.68 wt .-%, more preferably at most 0.65 wt .-%, more preferably not more than 0.62 wt .-% is limited in order not to adversely affect the material properties and to ensure sufficient weldability.
  • Si is an alloying element that contributes to solid solution hardening and, depending on the content, has a positive effect on an increase in strength, so that a content of at least 0.05% by weight is present.
  • the alloying element is limited to a maximum of 0.5% by weight, in particular a maximum of 0.45% by weight, preferably a maximum of 0.4% by weight, in order to ensure sufficient rolling capability.
  • Mn is an alloying element which contributes to hardenability and has a positive effect on the tensile strength, in particular for the setting of S to MnS, so that a content of at least 0.5% by weight is present.
  • the alloying element is limited to a maximum of 2.0% by weight, in particular a maximum of 1.7% by weight, preferably a maximum of 1.5% by weight, in order to ensure sufficient weldability.
  • Al may contribute as an alloying element for deoxidation, wherein a content of at least 0.01 wt .-%, in particular 0.015 wt .-% may be present.
  • the alloying element is limited to a maximum of 0.2 wt .-%, in particular at most 0, 15 wt .-%, preferably at most 0, 1 wt .-% to substantially reduce precipitates in the material, in particular in the form of non-metallic oxide inclusions and / or to avoid which can adversely affect the material properties.
  • the content can be adjusted between 0.02 and 0.06 wt .-%.
  • Cr may also contribute to the setting of the strength, in particular to the hardenability, as an alloying element, for example with a content of at least 0.05% by weight.
  • the alloying element is limited to a maximum of 1.0% by weight, in particular a maximum of 0.8% by weight, preferably a maximum of 0.7% by weight, in order to ensure sufficient weldability.
  • B can contribute to hardenability and increase in strength as an alloying element, in particular when N is set and can be present at a level of at least 0.0008% by weight, in particular of at least 0.001% by weight.
  • the alloying element can be limited to a maximum of 0.01% by weight, in particular to a maximum of 0.008% by weight, since higher contents have an adverse effect on the material properties and would result in a reduction of hardness and / or strength in the material.
  • Ti and Nb may be alloyed as alloying elements singly or in combination for grain refining and / or N-setting, especially when Ti is present at a level of at least 0.005 wt%.
  • the content of Ti should be at least 3.42 * N.
  • the alloying elements are limited in combination to a maximum of 0.2 wt .-%, in particular at most 0, 15 wt .-%, preferably at most 0, 1 wt .-%, since higher contents adversely affect the material properties, in particular adversely on the Toughness of the material.
  • Mo, V, Cu, Ni, Sn, Ca, Co, As, N, P, or S are alloying elements that can be counted as impurities individually or in combination, unless they are specifically added to set specific properties.
  • the contents are limited to a maximum of 0.2% by weight Mo, to a maximum of 0.2% by weight V, to a maximum of 0.2% by weight Cu, to a maximum of 0.4% by weight Ni, to a maximum 0.05 wt .-% Sn, to a maximum of 0.01 wt .-% Ca, to a maximum 0.02 wt.% Co, to a maximum of 0.02 wt.% As, to a maximum of 0.01 wt.% N, to a maximum of 0.06 wt.% P, to a maximum of 0.03 wt. % S.
  • the hardenable steel of the core layer of the hot-forming material thus has a tensile strength> 1500 MPa and / or a hardness> 465 HVIO, in particular a tensile strength> 1700 MPa and / or a hardness> 520 HVIO, preferably a tensile strength> 1900 MPa and / or in the press-hardened state a hardness> 575 HVIO, more preferably a tensile strength> 2100 MPa and / or a hardness> 630 HVIO.
  • the microstructure in the press-hardened state consists of at least 90%, preferably at least 95%, more preferably at least 98%, of martensite and / or martensite bainite and may also contain ferrite in the transition region to the intermediate layer.
  • the steel of the cover layers of the hot-forming material consists of Fe and production-related unavoidable impurities in% by weight
  • C is at its maximum as an alloying element 0.25 wt .-% before.
  • the C content is, for example, in the range between 0.003-0.19% by weight, in particular between 0.01-0.17% by weight.
  • Si is an alloying element capable of contributing to solid solution hardening and positively increasing in strength so that a content of at least 0.01% by weight may be present.
  • the alloying element is limited to not more than 1.0% by weight, in particular not more than 0.9% by weight, preferably not more than 0.8% by weight, in order to ensure adequate rolling and / or surface quality.
  • Mn is an alloying element that contributes to hardenability and can have a positive effect on the tensile strength, in particular for setting S to MnS, so that a content of at least 0.05% by weight may be present.
  • the alloying element is limited to a maximum of 3.0% by weight, in particular a maximum of 2.8% by weight, preferably a maximum of 2.6% by weight, in order to ensure sufficient weldability.
  • Al contributes as an alloying element for deoxidation, wherein a content of at least 0.01 wt .-%, in particular 0.015 wt .-% is present.
  • Al is limited to a maximum of 1.0% by weight, in particular not more than 0.9% by weight, preferably not more than 0.8% by weight, in order essentially to reduce precipitations in the material, in particular in the form of non-metallic oxidic inclusions and / or to avoid which can adversely affect the material properties.
  • Cr may also contribute to the adjustment of the strength as an alloying element and may be present in a content of in particular of at least 0.05% by weight and to a maximum of 1.0% by weight, in particular not more than 0.9% by weight. preferably be limited to a maximum of 0.8 wt .-% in order to ensure a substantially complete coatability of the surface can.
  • B may contribute to hardenability and strength enhancement as an alloying element, especially when N is set and may be present at a level of at least 0.0008% by weight.
  • the alloying element can be limited to a maximum of 0.01% by weight, in particular to a maximum of 0.005% by weight, since higher contents have an adverse effect on the material properties and would result in a reduction of the hardness and / or strength in the material.
  • Ti and Nb can be alloyed as alloying elements individually or in combination for grain refining and / or N-setting, with contents in particular of at least 0.001% by weight of Ti and / or of at least 0.001% by weight of Nb.
  • the content of Ti should be at least 3.42 * N.
  • the alloying elements in combination are limited to a maximum of 0.25% by weight, in particular not more than 0.2% by weight, preferably not more than 0.1% by weight, since higher contents have a disadvantageous effect on the material properties, in particular adversely on the Toughness of the material.
  • Mo, V, Cu, Ni, Sn, Ca, Co, N, P, or S are alloying elements that can be counted, individually or in combination, as impurities and / or normal companions unless specifically added to set specific properties ,
  • the contents are limited to a maximum of 0, 15 wt .-% Mo, to a maximum of 0.05 wt .-% V, to a maximum of 0.3 wt .-% Cu, to a maximum of 0.3 wt .-% Ni, to a maximum 0.05 wt .-% Sn, to a maximum of 0.01 wt .-% Ca, to a maximum of 0.02 wt .-% Co, to a maximum of 0.01 wt .-% N, to a maximum of 0, 1 wt. % P, to a maximum of 0.06% by weight S.
  • the steel of the cover layers may also consist of a hardenable steel.
  • the steel of the cover layers of the hot-forming material thus has a tensile strength ⁇ 1520 MPa and / or a hardness ⁇ 470 HV10 in the press-hardened state, in particular a tensile strength ⁇ 1200 MPa and / or a hardness ⁇ 370 HV10, preferably a tensile strength ⁇ 1000 MPa and / or a Hardness ⁇ 310 HV10, preferably tensile strength ⁇ 800 MPa and / or a hardness ⁇ 250, more preferably a tensile strength ⁇ 600 MPa and / or a hardness ⁇ 190 HV10.
  • HV corresponds to the Vickers hardness and is determined according to DIN EN ISO 6507-1: 2005 to -4: 2005.
  • the cover layers each have a material thickness ⁇ 32%, in particular ⁇ 22%, preferably ⁇ 15% based on the total material thickness of the hot-forming material and the intermediate layers each have a material thickness ⁇ 11%, in particular ⁇ 7%, preferably ⁇ 4%. based on the total material thickness of the hot-forming material.
  • the cover layers have a material thickness of at least 5%, in particular of at least 8%, per side, based on the total material thickness of the hot-forming material.
  • the intermediate layers have a material thickness of at least 0.5%, in particular of at least 1% per side, based on the total material thickness of the hot-forming material.
  • the hot forming material respectively the five-layer composite material has a total material thickness between 0.5 and 8.0 mm, in particular between 1.2 and 5.0 mm and preferably between 1.5 and 4.0 mm.
  • the material composite is produced by means of plating, in particular roll-cladding, preferably hot-rolled cladding or by casting.
  • the hot-forming material according to the invention is preferably produced by means of hot-roll cladding, as disclosed, for example, in German Patent DE 10 2005 006 606 B3. Reference is made to this patent, the contents of which are hereby incorporated by reference.
  • the hot-working material of the present invention may be produced by casting, and a possibility for its production is disclosed in Japanese Patent Laid-Open Publication JP-A-03133330.
  • Metallic composite fabrication is generally known in the art.
  • the hot-forming material in order to use the lightweight construction potential of high-strength hot-forming materials, in particular without having to fall back on subsequent additional measures, such as blasting for scale removal and to offer a certain barrier effect with respect to corrosion, the hot-forming material according to a further embodiment on one or both sides with a corrosion protection coating, in particular with a zinc-based or aluminum-based coating, preferably provided with an AlSi coating, so that the components produced from the hot forming material for later installation without further effort in a vehicle structure, for example, can be resistance point welded and have sufficient paint adhesion.
  • a corrosion protection coating in particular with a zinc-based or aluminum-based coating, preferably provided with an AlSi coating
  • the invention relates to a component made from a hot-forming material according to the invention by means of press hardening, in particular for the production of a component for the automotive, railway, shipbuilding or aerospace industry.
  • the press-hardened hot-forming material has only slight changes in the properties of the individual layers (composite partners) in comparison to the known from the prior art material composites with high strength and ductility in the near-surface region and in the cover layers.
  • the invention relates to a use of a component produced from the hot-forming material according to the invention in a body or in the chassis of a land-bound vehicle.
  • a land-bound vehicle preferably persons cars, commercial vehicles or buses, whether with an internal combustion engine, purely electrically powered or hybrid-powered vehicles.
  • the components can be used as longitudinal or transverse beams or columns in the land-bound vehicle, for example, they are formed as profiles, in particular as a crash profile in the bumper, sill, side impact or in areas where no to small deformations / intrusions in the event of a crash are required ,
  • Fig. 1 shows a schematic section through an inventive hot-forming material. Description of the preferred embodiment
  • the single FIGURE shows a schematic sectional view through a hot-forming material (1) according to the invention.
  • the hot-forming material (1) according to the invention comprises a core layer (1.1) made of a hardenable steel having a carbon content C of at least 0.2 wt .-%, which in the press-hardened state, a tensile strength> 1500 MPa and / or a hardness> 465 HV10, in particular a Tensile strength> 1700 MPa and / or a hardness> 520 HV10, preferably a tensile strength> 1900 MPa and / or a hardness> 575 HV10, more preferably a tensile strength> 2100 MPa and / or a hardness> 630 HV10, two cohesively with the core layer (1.1) bonded intermediate layers (1.2) made of a steel with a chromium content Cr of at least 2 wt .-%, which have a cubic-body-centered (austenic) or cubic face-centered
  • the free surfaces of the cover layers (1.3) of the hot-forming material (1) are provided with a corrosion protection coating (1.4), in particular with a zinc-based or aluminum-based coating, preferably with an AlSi coating.
  • the material thickness of the cover layers (1.3) per side is at least 5% and at most 30%, preferably at least 7.5% and at most 15% relative to the Total material thickness of the hot-forming material (1) and the material thickness of the intermediate layers (1.2) per side is at least 0.5% and at most 11%, preferably at least 1% and at most 7% based on the total material thickness of the hot-forming material (1), wherein the hot-forming material (1 ), for example, may have a total material thickness between 0.5 and 8 mm.
  • a hot-forming material was produced by means of hot-rolling plating, which had a five-layer composite material.
  • the cover layers used were a steel of the designation HX340LAD, as intermediate layers a Cr-alloyed steel of the designation 1.4510 was used and as the core layer a hardenable steel of the designation 37MnB5 was used.
  • Sheet metal blanks with two cover layers, two intermediate layers and a core layer arranged between the intermediate layers were stacked on top of each other, which were at least partially joined along their edges cohesively, preferably by welding to a pre-bond.
  • the pre-bond was at temperature
  • the composite material and the hot forming material was coated on both sides with an aluminum-based coating, an AlSi coating, each with a layer thickness of 15 ⁇ .
  • the layer thicknesses can be between 5 and 30 ⁇ .
  • the blanks were heated to austenitizing temperature, in particular above A c3 (based on the core layer) in an oven for about 6 minutes or heated and then hot formed into components in a cooled tool and cooled.
  • the cooling rates were included
  • the core layers were essentially completely made of martensite over the thickness, at the transition to the intermediate layer, the structure may additionally contain proportions of bainite and / or ferrite.
  • a structure with at least a portion of ferrite, bainite, martensite had set.
  • the intermediate layer essentially retained its original structure, which it had at the time of providing it before producing the material composite and further processing into a component.
  • the material thickness of the cover layers per side was 6% and that of the intermediate layers per side 2% based on the total material thickness of the hot-forming material, so that the core layer had a material thickness of 84% based on the total material thickness.
  • the hot-forming material according to the invention can also be part of a tailored product, for example part of a tailored welded blank and / or tailored rolled blank.

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

Abstract

L'invention concerne un matériau de formage à chaud (1) constitué d'un matériau composite à cinq couches, comprenant une couche centrale (1.1) en acier trempant possédant une teneur en carbone C d'au moins 0,2 % en poids, deux couches intermédiaires (1.2) reliées par liaison de matière à la couche centrale (1.1), constituées d'un acier ayant une teneur en chrome Cr d'au moins 2 %. en poids, qui présentent une structure de réseau cubique centré ou de réseau cubique à faces centrées, et, sur les faces extérieures des couches intermédiaires (1.2), respectivement une couche de recouvrement (1.3) reliée par liaison de matière à la couche intermédiaire (1.2), constituée d'un acier possédant une teneur en carbone C d'au maximum 0,25 % en poids. L'invention concerne également une pièce et une utilisation correspondante.
EP18724548.5A 2017-05-16 2018-05-15 Matériau de formage à chaud, pièce et utilisation correspondante Withdrawn EP3625048A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102017208254.2A DE102017208254A1 (de) 2017-05-16 2017-05-16 Warmumformmaterial, Bauteil und Verwendung
PCT/EP2018/062432 WO2018210779A1 (fr) 2017-05-16 2018-05-15 Matériau de formage à chaud, pièce et utilisation correspondante

Publications (1)

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EP3625048A1 true EP3625048A1 (fr) 2020-03-25

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EP (1) EP3625048A1 (fr)
DE (1) DE102017208254A1 (fr)
WO (1) WO2018210779A1 (fr)

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Publication number Priority date Publication date Assignee Title
DE102019203402A1 (de) 2019-03-13 2020-09-17 Thyssenkrupp Steel Europe Ag Flachproduktpaket, Verfahren zum Herstellen eines Werkstoffverbundes und seine Verwendung

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT290241B (de) * 1969-11-11 1971-05-25 Voest Ag Plattierter Formkörper
JPH03133630A (ja) 1989-10-20 1991-06-06 Nippon Steel Corp 耐デント性、耐面歪性に優れた良成形性クラッド鋼板
DE102005006606B3 (de) 2005-02-11 2006-03-16 Thyssenkrupp Steel Ag Verfahren zum Herstellen von walzplattiertem Warmband zur Weiterverarbeitung zu Kaltband und gewickeltes Coil aus solchem Warmband
JP5221348B2 (ja) * 2006-07-27 2013-06-26 国立大学法人 東京大学 複層鋼及び複層鋼の製造方法
DE102008022709A1 (de) 2008-05-07 2009-11-19 Thyssenkrupp Steel Ag Verwendung eines metallischen Verbundwerkstoffs in einer Fahrzeugstruktur
DE112012001858T5 (de) * 2011-12-29 2014-02-20 Arcanum Alloy Design Inc. Metallurgisch verbundener rostfreier Stahl
EP2886332B1 (fr) 2013-12-20 2018-11-21 ThyssenKrupp Steel Europe AG Produit en acier plat, et procédé de fabrication d'un composant d'une carrosserie de véhicule automobile et d'une carrosserie de véhicule automobile.

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DE102017208254A1 (de) 2018-11-22
WO2018210779A1 (fr) 2018-11-22

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