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WO2019011644A1 - Procédé de fabrication d'un composant trempé à la presse - Google Patents

Procédé de fabrication d'un composant trempé à la presse Download PDF

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Publication number
WO2019011644A1
WO2019011644A1 PCT/EP2018/067051 EP2018067051W WO2019011644A1 WO 2019011644 A1 WO2019011644 A1 WO 2019011644A1 EP 2018067051 W EP2018067051 W EP 2018067051W WO 2019011644 A1 WO2019011644 A1 WO 2019011644A1
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WO
WIPO (PCT)
Prior art keywords
coating
flat steel
steel product
weight
steel component
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.)
Ceased
Application number
PCT/EP2018/067051
Other languages
German (de)
English (en)
Inventor
Dirk Rosenstock
Manuela Ruthenberg
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
Priority to EP18745498.8A priority Critical patent/EP3652351A1/fr
Publication of WO2019011644A1 publication Critical patent/WO2019011644A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • 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
    • B32B15/012—Layered products comprising a layer of metal all layers being exclusively metallic one layer being formed of an iron alloy or steel, another layer being formed of aluminium or an aluminium alloy
    • 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
    • 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
    • C21D9/0068—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for particular articles not mentioned below
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C21/00—Alloys based on aluminium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C21/00—Alloys based on aluminium
    • C22C21/02—Alloys based on aluminium with silicon as the next major constituent
    • 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
    • C22C38/06—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
    • C22C38/26—Ferrous alloys, e.g. steel alloys containing chromium 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
    • C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium 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
    • C22C38/32—Ferrous alloys, e.g. steel alloys containing chromium 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
    • C22C38/38—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of 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
    • C22C38/60—Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur
    • 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
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/26—After-treatment
    • 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
    • C23C2/26—After-treatment
    • C23C2/28—Thermal after-treatment, e.g. treatment in oil bath
    • C23C2/29—Cooling or quenching
    • 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
    • C23C2/34—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the shape of the material to be treated
    • C23C2/36—Elongated material
    • C23C2/40—Plates; Strips
    • C23C2/405—Plates of specific length
    • 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
    • C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
    • C23C4/04—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the coating material
    • C23C4/06—Metallic material
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D3/00—Electroplating: Baths therefor
    • C25D3/02—Electroplating: Baths therefor from solutions
    • C25D3/56—Electroplating: Baths therefor from solutions of alloys
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
    • B21D22/02—Stamping using rigid devices or tools
    • B21D22/022—Stamping using rigid devices or tools by heating the blank or stamping associated with heat treatment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
    • B21D22/20—Deep-drawing
    • B21D22/208—Deep-drawing by heating the blank or deep-drawing associated with heat treatment

Definitions

  • the present invention relates to methods for producing a steel component comprising a substrate and a coating, a corresponding steel component and its use in the automotive sector.
  • WO 2015/036151 A1 discloses a method for producing a steel component provided with a metallic, corrosion-protective coating and a corresponding steel component.
  • the method according to this document comprises coating a flat steel product with an alloy of aluminum, zinc, magnesium and optionally silicon and iron, cutting a blank from the flat steel product, heating the blank and reshaping the blank to obtain the desired steel component.
  • DE 699 07 816 T2 discloses a method for producing a coated hot and cold rolled steel sheet having very high strength after thermal treatment.
  • a flat steel product is provided with a coating and thermally treated.
  • the workpiece is heated to a temperature of over 750 ° C.
  • the present invention is based on the object to provide a method for the production of steel components comprising a substrate and a coating available, can be obtained with the corresponding steel components, characterized by a particularly high bending angle ⁇ according to VDA 238-100 and thus also characterized by an improved crash behavior when used in the automotive sector. NEN. Furthermore, according to the invention, in coated flat steel products, the average arithmetic mean roughness R a should lie within a certain optimum interval, in order thereby to achieve an optimized bending angle, in order to improve the properties of the flat steel products.
  • step (C) forming the heated flat steel product of step (B) in a mold with simultaneous cooling to obtain the steel component.
  • Step (A) of the process according to the invention comprises the provision of a flat steel product containing (all data in% by weight)
  • 0.15 to 0.50 preferably 0.20 to 0.30, particularly preferably 0.21 to 0.25 C,
  • 0.10 to 0.50 preferably 0.15 to 0.40, particularly preferably 0.20 to 0.30 Si,
  • Unavoidable impurities in the substrate according to the invention are, for example, Cu, Mo, V, Ni and / or Sn.
  • any flat steel product which appears suitable to the person skilled in the art with the corresponding analysis and a corresponding coating can be used.
  • the flat steel product used is preferably a strip, in particular a hot strip or a cold strip, around a sheet, ie. H. a piece of a hot strip or a cold strip, or a board made of a hot strip or a board made of a cold strip.
  • the present invention preferably relates to the method according to the invention, wherein the flat steel product is a board made of a hot strip or a board made of a cold strip.
  • the flat steel product according to the invention is provided with a coating, the coating preferably having 3 to 15, particularly preferably 7 to 12, very particularly preferably 9 to 10 Si, 1 to 3.5, preferably 2 to 3.5 Fe, up to 0, 5 alkali and / or alkaline earth metals, for example magnesium, calcium and / or lithium, the radical AI and unavoidable impurities (all figures in wt .-%).
  • the coating can be carried out by a fire coating, an electrolytic coating or by means of a piece coating process.
  • the present invention therefore preferably relates to the method according to the invention, wherein the coating takes place by means of a fire coating, an electrolytic coating or by means of a piece coating process.
  • the application of the aluminum-silicon-iron alloy is carried out by means of a continuous fire-coating process.
  • the temperature of the aluminum molten bath is between 650 ° C and 720 ° C.
  • Silicon in the coating acts as a diffusion blocker and serves to calm the melt bath when applying the coating formed from the aluminum alloy by means of fire coating.
  • the thickness of the coating according to the invention is preferably from 5 to 60 ⁇ , preferably 10 to 40 ⁇ .
  • the present invention therefore preferably relates to the process according to the invention, wherein the coating weight of the double-sided coating is from 30 to 360 g / m 2 .
  • the coating may be present on one side of the flat steel product or on both sides of the flat steel product.
  • the present invention therefore preferably relates to the process according to the invention, wherein the coating is present on one side of the flat steel product or on both sides of the flat steel product, in particular on both sides of the flat steel product.
  • the coated flat steel product from step (A) is preferably transferred directly into the process step (B) according to the invention.
  • further steps are carried out, for example separation of areas, in particular sheets or blanks of the flat steel product, for example by shearing or laser cutting, introducing holes by laser machining or punching, preceding heat treatments to change the properties of the coating or substrate, and / or to introduce a pre-deformation.
  • Step (B) of the process according to the invention comprises treating the steel flat product at a furnace temperature Ti (in K) for a duration ti (in h) such that pi in accordance with the equation of the general formula (2) has a value from 8 to 30, preferably from 9 to 30, more preferably 9 to 26, most preferably 10 to 22
  • step (B) the heat treatment is carried out such that the parameter p1 mentioned in equation (2) has a value of 8 to 30.
  • Ti means the furnace temperature in Kelvin, ie. the temperature, which is carried out in the oven, in the step (B) of the method according to the invention is present.
  • Ti is preferably from 1070 to 1350 K, particularly preferably from 1100 to 1250 K, wherein it must be satisfied at the same time that pl has a value of from 9 to 30 according to equation (2).
  • the present invention therefore preferably relates to the process according to the invention, Ti being from 1070 to 1350 K, particularly preferably from 1100 to 1250 K.
  • ti is the duration for which the flat steel product is exposed to the corresponding temperature Ti. This is preferably the period from retraction / insertion of the sample in the oven to the extension / removal of the sample from the oven.
  • ti is given in hours (h)
  • ti according to the invention is preferably 0.02 to 0.50 h, more preferably 0.04 to 0.50 h, wherein it must be satisfied at the same time that pi has a value according to equation (2) from 8 to 30, preferably from 9 to 30, more preferably from 9 to 26, most preferably from 10 to 22 having.
  • the present invention therefore preferably relates to the process according to the invention, where ti is 0.02 to 0.50 h, more preferably 0.04 to 0.50 h.
  • a constant temperature Ti it is possible for a constant temperature Ti to prevail during step (B) over the entire time ti. It is also possible according to the invention for temperatures Ti to be present within the time ti which are not constant, for example in one part (a) of the period ti (t la ) there is a temperature Ti a in a further part (b) of the period ti (t lb ) is a temperature T lb , and in a further part (c) of the period ti (t lc ) is a temperature T lc, etc., before.
  • the arithmetic mean roughness R a is in a range which can negatively influence the further processing properties, for example tribological properties during forming, heat transfer, paintability.
  • step (B) of the process according to the invention in particular the period from the introduction / insertion of the sample into the oven until the sample is extracted / removed from the oven, a desired arithmetic mean roughness value R a is achieved .
  • This can be determined by methods known to those skilled in the art, preferably the arithmetic mean roughness R a is determined according to DIN EN 10049: 2014-03 in ⁇ , particularly preferably as an average value of 40 measurements for samples coated on both sides, 20 on each side of the samples, each transverse to the rolling direction of the sample. For samples coated on one side, the measurement is made only on the coated side.
  • step (A) and step (B) in a further method step between step (A) and step (B) to the flat steel product at least one particular Range added or further elaborated, so that the particular area of at least one of the attributes of support weight, sheet thickness, chemical composition, which is different from the flat steel product before this further process step, wherein the equation of the general formula (1) applies only to the areas which were already present in the original flat steel product, whereby preferably different mechanical properties are achieved.
  • step (C) in a further process step in step (C) at least one particular area of the flat steel product is further developed so that the particular area experiences other cooling conditions in the tool (eg by local heating of the tool) than in a conventional one Press hardening process (with tools cooled to ⁇ 100 ° C), wherein the equation of the general formula (1) applies only to the areas produced by the usual press hardening process, whereby preferably different mechanical properties are obtained.
  • tailored blanks for example tailor-welded blanks, tailor-rolled blanks, tailored tempering.
  • the flat steel product is reinforced in at least one area by an additionally applied, different or similar flat steel product (for example by joining), than in the unreinforced areas.
  • Step (C) of the process of the invention comprises forming the heated flat steel product of step (B) in a mold while cooling to obtain the steel component.
  • step (C) of the process according to the invention all processes known to the person skilled in the art can be used for hot forming, for example described in hot forming in automotive engineering - processes, materials, surfaces, Landsberg / Lech: Verl. Moderne Industrie, 2012, Die part dertechnik.
  • step (C) of the process according to the invention the desired steel component is obtained from the flat steel product from step (B) by forming.
  • the desired hardness structure ie. At least 80% martensite, the remainder bainite, ferrite and retained austenite
  • the cooling in step (C) of the process according to the invention is preferably carried out at a rate of 27 to 1000 K / s, preferably 50 to 500 K / s.
  • the present invention therefore preferably relates to the process according to the invention, wherein the cooling in step (C) takes place at a cooling rate of 27 to 1000 K / s.
  • ⁇ means the bending angle according to VDA 238-100, which the steel component produced according to the invention has.
  • the bending angle ⁇ indicated in equation (1) is determined according to the invention with the longitudinal direction of the sample. Bending axis Transverse to rolling direction. If the bending angle ⁇ stated in equation (1) is determined according to the invention with the sample position transverse, that is to say, Bending axis Longitudinally determined to the rolling direction, due to the material anisotropy the determined values are approx. 6.5% lower. Also, for other sample plies (e.g., diagonal), slightly different bending angles may be seen, with the deviations preferably between those of the longitudinal and transverse plies, i. between 0 and 6.5%. The values reflect in their overall tendency the relationship according to equation (1) again. Therefore, the equation (1) according to the invention is preferably for bending angle a, with the longitudinal direction of the sample, ie. Bending axis transverse to the rolling direction.
  • the crash suitability of a steel component depends essentially on the bending angle ⁇ at maximum force measured in the "flake bending test for metallic materials" (see Till Laumann, Qualitative and quantitative assessment of the crashworthiness of high-strength steels, Meisenbach Verlag Bamberg, 2010 ( ISBN 978-3-87525-299-6)). High bending angles stand for a good crash suitability.
  • R a represents the arithmetic mean roughness and is expressed in ⁇ .
  • the arithmetic mean roughness R a according to DIN EN 10049: 2014-03 is 1, 30 to 2.30 ⁇ m, preferably 1.50 to 2.22 ⁇ m, particularly preferably 1.60 to 2.10 ⁇ m and the bending angle ⁇ according to VDA 238-100 is 54 to 70 °, preferably 54 to 66 °, particularly preferably 54 to 62 °, wherein the values according to the invention must be linked together so that the equation of the general formula (1) applies.
  • the present invention also relates to a steel component comprising a substrate (all data in% by weight) 0.15 to 0.50, preferably 0.20 to 0.30, particularly preferably 0.21 to 0.25 C,
  • 0.10 to 0.50 preferably 0.15 to 0.40, particularly preferably 0.20 to 0.30 Si,
  • this steel component according to the invention is obtained by the method according to the invention.
  • the present invention relates to the steel component according to the invention, wherein it is obtained by forming a corresponding flat steel product, wherein the flat steel product has been treated prior to forming at a furnace temperature T 1 (in K) for a duration ti (in h) such that p 1 according to the equation of general formula (2) has a value of 8 to 30, preferably from 9 to 30, particularly preferably from 9 to 26, very particularly preferably from 10 to 22, having
  • the present invention relates to the steel component according to the invention, wherein the coating weight of the double-sided coating 30 to 360 g / m2, preferably 100 to 200 g / m 2 , particularly preferably 120 to 180 g / m 2 , for example 150 g / m 2 ,
  • the present invention also relates to a steel component containing (all data in% by weight)
  • Residual Fe and unavoidable impurities as substrate containing a coating (all data in% by weight)
  • the present invention also relates to the use of a coated steel component according to the invention in the automotive sector, in particular as a bumper support / reinforcement, door reinforcement, B-pillar reinforcement, A-pillar reinforcement, roof frame or sill.
  • a coated steel component according to the invention in the automotive sector, in particular as a bumper support / reinforcement, door reinforcement, B-pillar reinforcement, A-pillar reinforcement, roof frame or sill.
  • FIG. 1 shows an exemplary topography measurement in an exaggerated representation to illustrate the surface roughness.
  • FIG. 2 shows an exemplary illustration (micrograph) of two different topologies on the surface of steel components according to the invention, in which:
  • Steel flat products (cold strip) of the analysis mentioned in Table 1 are used in the form of blanks.
  • the cold strip was coated and the boards were cut out.
  • the coating of the flat steel products used by way of example is a so-called AlSi coating which can be adjusted, inter alia, by fire coating, consisting of 9 to 10 wt.% Si, 2 to 3.5 wt.% Iron, balance aluminum consists.
  • the thus obtained and coated flat steel products are heated to a temperature Ti (see table) for a duration ti (see table), then placed in a press mold, where they are hot formed to the steel component and as quickly as possible by contact with a conventional hot forming tool within approx.
  • oven temperature T oven residence time ti plate thickness and coating weight are varied and accordingly samples are prepared for the bending test.
  • the measurement is carried out on 5 samples each
  • Table 1 Composition of the melt used, all data in wt .-%, balance Fe
  • Table 2 shows the process parameters and the resulting bending angles.
  • Table 2 Process parameters and obtained bending angles
  • the steel component produced according to the invention has an improved crash behavior and can therefore be used advantageously in the automotive sector.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Plasma & Fusion (AREA)
  • Electrochemistry (AREA)
  • Heat Treatment Of Sheet Steel (AREA)
  • Heat Treatment Of Articles (AREA)

Abstract

La présente invention concerne un procédé de fabrication d'un composant en acier comprenant un substrat et un revêtement, un composant en acier correspondant et son utilisation dans le secteur automobile.
PCT/EP2018/067051 2017-07-10 2018-06-26 Procédé de fabrication d'un composant trempé à la presse Ceased WO2019011644A1 (fr)

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DE102017211753.2A DE102017211753A1 (de) 2017-07-10 2017-07-10 Verfahren zur Herstellung eines pressgehärteten Bauteils

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DE102017211753A1 (de) 2019-01-10
CN109234641A (zh) 2019-01-18
EP3652351A1 (fr) 2020-05-20

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