EP3728656A1 - Verfahren zum erzeugen metallischer bauteile mit angepassten bauteileigenschaften - Google Patents
Verfahren zum erzeugen metallischer bauteile mit angepassten bauteileigenschaftenInfo
- Publication number
- EP3728656A1 EP3728656A1 EP18836369.1A EP18836369A EP3728656A1 EP 3728656 A1 EP3728656 A1 EP 3728656A1 EP 18836369 A EP18836369 A EP 18836369A EP 3728656 A1 EP3728656 A1 EP 3728656A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- steel
- mass
- dual
- phase
- 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.)
- Granted
Links
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 7
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 45
- 239000010959 steel Substances 0.000 claims abstract description 45
- 238000001816 cooling Methods 0.000 claims abstract description 41
- 238000000034 method Methods 0.000 claims abstract description 41
- 239000000463 material Substances 0.000 claims abstract description 38
- 229910000885 Dual-phase steel Inorganic materials 0.000 claims abstract description 32
- 238000003780 insertion Methods 0.000 claims abstract description 26
- 230000037431 insertion Effects 0.000 claims abstract description 26
- 238000000137 annealing Methods 0.000 claims abstract description 15
- 229910000712 Boron steel Inorganic materials 0.000 claims abstract description 10
- YHEXKHYQCQBLJR-UHFFFAOYSA-N [B].[Mn].[C] Chemical compound [B].[Mn].[C] YHEXKHYQCQBLJR-UHFFFAOYSA-N 0.000 claims abstract description 10
- 239000011159 matrix material Substances 0.000 claims abstract description 9
- 229910052782 aluminium Inorganic materials 0.000 claims description 17
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 17
- 229910000734 martensite Inorganic materials 0.000 claims description 12
- 229910001563 bainite Inorganic materials 0.000 claims description 9
- 230000009977 dual effect Effects 0.000 claims description 9
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 6
- 239000012535 impurity Substances 0.000 claims description 3
- 229910052742 iron Inorganic materials 0.000 claims description 3
- 230000008018 melting Effects 0.000 claims description 3
- 238000002844 melting Methods 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 2
- RZVAJINKPMORJF-UHFFFAOYSA-N Acetaminophen Chemical compound CC(=O)NC1=CC=C(O)C=C1 RZVAJINKPMORJF-UHFFFAOYSA-N 0.000 claims 1
- 238000000465 moulding Methods 0.000 claims 1
- 238000010791 quenching Methods 0.000 claims 1
- 229910001566 austenite Inorganic materials 0.000 abstract description 3
- 238000007493 shaping process Methods 0.000 abstract 1
- 229910000859 α-Fe Inorganic materials 0.000 description 19
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 13
- 229910052799 carbon Inorganic materials 0.000 description 13
- 239000011572 manganese Substances 0.000 description 12
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 11
- 229910052748 manganese Inorganic materials 0.000 description 11
- 230000015572 biosynthetic process Effects 0.000 description 9
- 229910001562 pearlite Inorganic materials 0.000 description 7
- 230000007423 decrease Effects 0.000 description 6
- 229910045601 alloy Inorganic materials 0.000 description 5
- 239000000956 alloy Substances 0.000 description 5
- 238000010521 absorption reaction Methods 0.000 description 4
- 239000011651 chromium Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 230000035945 sensitivity Effects 0.000 description 4
- 239000010936 titanium Substances 0.000 description 4
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 3
- 229910000914 Mn alloy Inorganic materials 0.000 description 3
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 3
- QFGIVKNKFPCKAW-UHFFFAOYSA-N [Mn].[C] Chemical compound [Mn].[C] QFGIVKNKFPCKAW-UHFFFAOYSA-N 0.000 description 3
- 229910052804 chromium Inorganic materials 0.000 description 3
- 230000001934 delay Effects 0.000 description 3
- 230000001419 dependent effect Effects 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 239000010955 niobium Substances 0.000 description 3
- 229910052719 titanium Inorganic materials 0.000 description 3
- 229910000838 Al alloy Inorganic materials 0.000 description 2
- 229910000760 Hardened steel Inorganic materials 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 2
- 230000003111 delayed effect Effects 0.000 description 2
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 2
- 238000001000 micrograph Methods 0.000 description 2
- 238000004881 precipitation hardening Methods 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 1
- 229910000617 Mangalloy Inorganic materials 0.000 description 1
- 229910000742 Microalloyed steel Inorganic materials 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- 229910001257 Nb alloy Inorganic materials 0.000 description 1
- 229910001069 Ti alloy Inorganic materials 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 229910052796 boron Inorganic materials 0.000 description 1
- PALQHNLJJQMCIQ-UHFFFAOYSA-N boron;manganese Chemical compound [Mn]#B PALQHNLJJQMCIQ-UHFFFAOYSA-N 0.000 description 1
- 239000010960 cold rolled steel Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000000265 homogenisation Methods 0.000 description 1
- 238000005304 joining Methods 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- 229910052758 niobium Inorganic materials 0.000 description 1
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 description 1
- 230000006911 nucleation Effects 0.000 description 1
- 238000010899 nucleation Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 108090000623 proteins and genes Proteins 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Classifications
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- 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
- C21D1/26—Methods of annealing
-
- 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
- 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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
-
- 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
- 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
- C21D9/50—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for welded joints
-
- 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
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
-
- 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
- C22C38/06—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
- C22C38/34—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of 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
- C22C38/18—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
- 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
- C21D2201/00—Treatment for obtaining particular effects
-
- 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
- C21D2211/001—Austenite
-
- 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
- C21D2211/005—Ferrite
-
- 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 invention relates to a method for producing metallic components with adapted properties according to the preamble of claim 1.
- the inven tion relates to a method for producing steel sheets and steel components thereof, wherein the sheets of sheet metal pieces are assembled with different properties and in particular special welded together ,
- TWB Tailored Welded Blanks
- Tailored Welded blanks play a major role.
- These high-hardening steels are supplied in sheet form, then formed, and then the formed components are heated to a high degree until fully austenitized, then transferred to a cold press and cooled in this press by squeezing cold tool jaws or molds at one speed cooled above the critical hardening speed, so that the fully austenitized component is present at least predominantly in the martensitic phase, which hardens up to more than 1500 MPa allows.
- This process which is first reformed and then cured and cooled by the application of the mold, is also referred to as indirect or mold curing.
- press-hardening the board made of the highly hardenable steel is heated to a temperature above the austenitizing temperature and austenitized as completely as possible. Subsequently, this present in the Austenitschreib board is transferred to a mold to form and so well formed with one or more press stroke or press strokes as well as cured by the large heat flow from the board in the mold convincing. This method is also called a direct method.
- a modern vehicle body thus consists of a number of load-conducting, high-strength components as well as soft, deformable elements for energy absorption.
- Tailored welded blanks make it possible to integrate both the load line and the deformability into a single component, which allows for improved possibilities of energy absorption in the event of a crash and even more improved occupant protection in motor vehicles.
- These tailored welded blanks therefore consist of hardenable areas made of the already mentioned CMnB steels and welded areas of a softer partner material.
- Tailored Welded blanks of this kind can also be processed using the two mentioned hardening methods. Accordingly, during the press-hardening process or during the mold-hardening process, ie during the direct or indirect process in the curable region, a high-strength, martensitic hardened structure is produced.
- the softer partner material participates equally in the press hardening process, but owing to the different alloy layer, significantly lower strength values result at higher strain values, which enables a high degree of energy absorption.
- the object of the invention is to provide a method in which, for example, Tailor Welded blanks are created in a simple and cost-effective manner, in which the softer partner reaches stable mechanical characteristics independently of the cooling situation.
- the softer partner material in a tailored welded blank is formed from a steel with a dual-phase structure (DP steel).
- the dual-phase structure according to the invention consists of a ferritic matrix with embedded Martensitinklusio NEN. This allows due to the enormous solidification ability at the same strength significantly better formability in terms of elongation at break and thus higher energy absorption as a ferritic-pearlitic structure, as are known in the art. Since ago, the steels are very well suited with a dual-phase structure according to the invention as a soft partner material.
- Known dual-phase steels are known, for example, from EP 2 896 715 B1, in which a dual-phase steel with titanium precipitation hardening is described.
- the formation of pearlite and bainite must be delayed in such a way that these structural phases do not occur at the usual cooling rates.
- manganese, chromium, boron and molybdenum can be added to retard the formation of pearlite and bainite.
- this also delays the formation of ferrite after fully austenitic annealing in the furnace, which is critical for short transfer times between the furnace and the press, high insertion temperatures and high cooling rates in the press.
- a structure can be formed which consists of an assumed martensitic matrix with little ferrite, which has only small elongations at high strengths. Only at lower cooling rates in the press are stable mechanical characteristics, regardless of the insertion temperature, in the press.
- the material in the furnace is annealed so that in addition to austenite and ferrite is present.
- annealed in the furnace intercritical. Intercritical annealing means that the material is annealed between its Ac1 and Ac3 temperature.
- the Ac3 temperature for the soft partner material must be kept high, so that an intercritical annealing is even possible.
- the Ac3 value is increased by aluminum.
- the dual phase steel is formed with an increased aluminum content.
- the annealing temperature is set at> 800 ° C due to the CMnB partner steel, so that this annealing value for the intercritical annealing must be taken as given.
- the Ac3 temperature of CMNB steels is about 840 q C.
- the concept of the invention is based on a C-Si-Mn-Cr-Al-Nb / Ti alloy concept.
- the contained carbon serves to adjust the strength level, with a higher carbon content lowering the Ac3 value, increasing the strength and just increasing the yield strength.
- the strain decreases, the ferrite, pearlite and bainite formation are delayed and the amount of martensite in the structure increases.
- the task of the manganese is the adaptation of the strength level. More manganese lowers the Ac3 value and increases the strength and yield strength. At a higher manganese content, the strain decreases and the ferrite, pearlite and bainite formation is retarded and the amount of martensite in the structure increases.
- Typical values of Ae1 temperatures or Ae3 temperatures for DP steels according to the invention and alloys not according to the invention are listed in Table 1. These calculated values essentially correspond to the Ac1 temperatures or Ac3 temperatures.
- a too low Ae1 temperature or Ae3 temperature is achieved by the respectively selected alloy composition and / or the desired mechanical characteristic values (eg due to silicon portions which are too low) are not reached.
- Chromium primarily delays pearlite and bainite formation and ensures martensite formation, so that chromium has a major influence on ensuring the dual-phase character.
- Niobium and titanium accelerate ferrite formation and have a grain refining effect.
- Figure 1 the elongation and strength of dual-phase microstructures and ferritic-pearlitic microstructures according to the prior art
- Figure 2 the behavior of fully austenitic annealed dual-phase steels at highdera th in the press, showing once the strength, depending on the insertion temperature and the elongation, depending on the insertion temperature, and the achievable structure;
- FIG. 3 shows the behavior of fully austenitically annealed dual-phase steels at high and low cooling rates in the press
- Figure 4 the influence of carbon on the mechanical characteristics, depending on the insertion temperature
- Figure 5 micrographs of dual-phase steels with different carbon content
- FIG. 7 the microstructures with different manganese contents
- FIG. 9 shows the micrographs at different aluminum contents
- FIG. 10 Influence of the intercritically annealed aluminum-alloyed invention
- Dual-phase steel concept compared to fully austenitic annealed carbon-manganese alloys.
- the inventive method provides as a tailored welded blank (TWB) at least one usually flat sheet metal part of a high-hardening steel material, such as a boron-manganese steel and in particular a steel from the family of 22MnB5 or 20MnB8 and the same steels with at least one usually to combine flat sheet metal part of a dual phase steel.
- a tailored welded blank TWB
- a high-hardening steel material such as a boron-manganese steel and in particular a steel from the family of 22MnB5 or 20MnB8 and the same steels with at least one usually to combine flat sheet metal part of a dual phase steel.
- Such a combined tailored welded blank may then be heated sufficiently in the direct or indirect process and then reformed or reshaped, then heated and quenched.
- a dual-phase steel which has a comparatively high aluminum content. According to the invention, it has been found that aluminum reduces the sensitivity of the mechanical characteristics to the insertion temperature and greatly reduces the sensitivity to the cooling rate in the press.
- Simple carbon-manganese alloys which are fully austenitic annealed in the oven, at high cooling rates in the press on a strong dependence on the Einlegetempera on.
- a composition according to the invention of the dual-phase steel is as follows, where all percentages are given in mass percent:
- Al 0.4-1.5% preferably 0.50-1.30%, particularly preferred 0.60-1.20%
- the degree of austenitisation, which occurs in the dual-phase steel, is between 50 and 90% by volume, the target structure being a fine dual-phase steel with a ferritic matrix and 5 to 20% by volume martensite and optionally a little bainite.
- the target structure is established when the subsequent cooling process is adhered to and accordingly during the manipulation of the component or the board into the cooling press, ie during handling, a cooling rate of 5 to 500 Kelvin / sec is maintained and the insertion temperature into the cooling press 400 to 850'G is preferably 450 to 750 ° C, wherein the insertion temperature in the cooling press in the form hardening process (indirect method) is set to 700 to 800 ° C.
- the insertion temperature is set to 400 to 650 ° C, preferably 440 to 600 G, and more preferably 450 to 520 G. ,
- the special effect especially in the direct process, ie press hardening at a laying temperature of 450 to 520 ° C, is that the microstructure can be optimally adjusted so that a particularly cool cooling rate results in a robust system.
- the insertion temperature must not be too high due to the target structure for the dual-phase part and, on the other hand, the insertion temperature must not be too low, otherwise the carbon-manganese-boron steel falls below the Ms temperature.
- the cooling rate in the press should be> 10 Kelvin / sec.
- an air cooling about 5 Kelvin / sec to 70 Kelvin / sec cooling rate
- a plate cooling cooling rates of more than 80 Kelvin / sec easily achievable
- the recoverable tensile strength is about 660 MPa to about 920 MPa.
- this also means that reproducible strength values within the desired tolerances are difficult to produce with the known dual-phase steels in the case of the variable insertion temperatures and with the process-usual fluctuations in the insertion temperature with the known dual-phase steels.
- FIG. 3 also shows that the characteristic values shown, in particular when cooling with water, depend strongly on the insertion temperature and the cooling rate in the press, where the microstructure also differs significantly from the microstructure of FIG. 2, since FIG. 2 shows a significantly higher cooling rate is present.
- the invention in order to ensure a sufficient amount of ferrite and thus a ferritic matrix in the dual-phase structure, it is possible to anneal intercritically in the furnace, so that apart from austenite, ferrite is also present.
- the Ac3 temperature must be kept high for the soft partner material, ie the dual-phase beam, so that intercritical annealing is possible at all. This Ac3 value is increased by aluminum according to the invention.
- the good properties of the dual-phase steel can be transferred to a process for press-hardening or shape-hardening, in particular for producing a tailored welded blanks.
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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)
- Heat Treatment Of Articles (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102017131253.6A DE102017131253A1 (de) | 2017-12-22 | 2017-12-22 | Verfahren zum Erzeugen metallischer Bauteile mit angepassten Bauteileigenschaften |
PCT/EP2018/086685 WO2019122372A1 (de) | 2017-12-22 | 2018-12-21 | Verfahren zum erzeugen metallischer bauteile mit angepassten bauteileigenschaften |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3728656A1 true EP3728656A1 (de) | 2020-10-28 |
EP3728656B1 EP3728656B1 (de) | 2022-02-02 |
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EP18836369.1A Active EP3728656B1 (de) | 2017-12-22 | 2018-12-21 | Verfahren zum erzeugen metallischer bauteile mit angepassten bauteileigenschaften |
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US (1) | US11459628B2 (de) |
EP (1) | EP3728656B1 (de) |
DE (1) | DE102017131253A1 (de) |
ES (1) | ES2907011T3 (de) |
WO (1) | WO2019122372A1 (de) |
Family Cites Families (18)
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EP1767659A1 (de) | 2005-09-21 | 2007-03-28 | ARCELOR France | Herstellungsverfahren eines Stahlwerkstücks mit mehrphasigem Mikrogefüge |
WO2008110670A1 (fr) | 2007-03-14 | 2008-09-18 | Arcelormittal France | Acier pour formage a chaud ou trempe sous outil a ductilite amelioree |
JP5217395B2 (ja) | 2007-11-30 | 2013-06-19 | Jfeスチール株式会社 | 伸びの面内異方性が小さい高強度冷延鋼板およびその製造方法 |
DE102007062597A1 (de) * | 2007-12-22 | 2009-06-25 | Daimler Ag | Karosserieteil für eine Karosserie eines Kraftwagens |
DE102009030489A1 (de) | 2009-06-24 | 2010-12-30 | Thyssenkrupp Nirosta Gmbh | Verfahren zum Herstellen eines warmpressgehärteten Bauteils, Verwendung eines Stahlprodukts für die Herstellung eines warmpressgehärteten Bauteils und warmpressgehärtetes Bauteil |
KR100958019B1 (ko) | 2009-08-31 | 2010-05-17 | 현대하이스코 주식회사 | 복합조직강판 및 이를 제조하는 방법 |
DE102009052210B4 (de) * | 2009-11-06 | 2012-08-16 | Voestalpine Automotive Gmbh | Verfahren zum Herstellen von Bauteilen mit Bereichen unterschiedlicher Duktilität |
DE102010055148B4 (de) | 2010-12-18 | 2016-10-27 | Tu Bergakademie Freiberg | Verfahren zur Herstellung formgehärteter Bauteile |
EP2655675B1 (de) | 2010-12-24 | 2021-03-10 | Voestalpine Stahl GmbH | Verfahren zum erzeugen gehärteter bauteile |
DE102012002079B4 (de) | 2012-01-30 | 2015-05-13 | Salzgitter Flachstahl Gmbh | Verfahren zur Herstellung eines kalt- oder warmgewalzten Stahlbandes aus einem höchstfesten Mehrphasenstahl |
ES2586507T3 (es) | 2012-07-30 | 2016-10-14 | Tata Steel Nederland Technology B.V. | Método para producir cinta de acero de acero al carbono |
RU2605014C2 (ru) | 2012-09-26 | 2016-12-20 | Ниппон Стил Энд Сумитомо Метал Корпорейшн | Лист двухфазной стали и способ его изготовления |
DE102014011212A1 (de) | 2014-07-29 | 2016-02-04 | Hans Wilcke | Verfahren und Einrichtungen für die Sicherheit auf gasbetriebenen Schiffen |
DE102014112126A1 (de) * | 2014-08-25 | 2016-02-25 | Voestalpine Stahl Gmbh | Mikrolegierter Stahl und zusammengesetzte Platinen aus mikrolegiertem Stahl und pressgehärtetem Stahl |
DE102014017274A1 (de) * | 2014-11-18 | 2016-05-19 | Salzgitter Flachstahl Gmbh | Höchstfester lufthärtender Mehrphasenstahl mit hervorragenden Verarbeitungseigenschaften und Verfahren zur Herstellung eines Bandes aus diesem Stahl |
JP6224574B2 (ja) | 2014-12-10 | 2017-11-01 | 株式会社神戸製鋼所 | ホットスタンプ用鋼板、および該鋼板を用いたホットスタンプ成形部品 |
WO2017144419A1 (en) | 2016-02-23 | 2017-08-31 | Tata Steel Ijmuiden B.V. | Hot formed part and method for producing it |
DE102017131247A1 (de) | 2017-12-22 | 2019-06-27 | Voestalpine Stahl Gmbh | Verfahren zum Erzeugen metallischer Bauteile mit angepassten Bauteileigenschaften |
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- 2018-12-21 WO PCT/EP2018/086685 patent/WO2019122372A1/de unknown
- 2018-12-21 ES ES18836369T patent/ES2907011T3/es active Active
- 2018-12-21 EP EP18836369.1A patent/EP3728656B1/de active Active
Also Published As
Publication number | Publication date |
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US11459628B2 (en) | 2022-10-04 |
WO2019122372A1 (de) | 2019-06-27 |
EP3728656B1 (de) | 2022-02-02 |
US20210164066A1 (en) | 2021-06-03 |
ES2907011T3 (es) | 2022-04-21 |
DE102017131253A1 (de) | 2019-06-27 |
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