EP2997168B1 - Verfahren zum herstellen eines feuerverzinkten und wärmebehandelten stahlbleches durch abschrecken und partitionieren - Google Patents

Verfahren zum herstellen eines feuerverzinkten und wärmebehandelten stahlbleches durch abschrecken und partitionieren Download PDF

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EP2997168B1
EP2997168B1 EP14734592.0A EP14734592A EP2997168B1 EP 2997168 B1 EP2997168 B1 EP 2997168B1 EP 14734592 A EP14734592 A EP 14734592A EP 2997168 B1 EP2997168 B1 EP 2997168B1
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Prior art keywords
steel sheet
temperature
austenite
martensite
partitioning
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English (en)
French (fr)
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EP2997168A2 (de
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Grant Aaron THOMAS
Jose Mauro B. LOSZ
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Cleveland Cliffs Steel Properties Inc
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AK Steel Properties Inc
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    • 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
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/78—Combined heat-treatments not provided for above
    • C21D1/785—Thermocycling
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/005—Heat treatment of ferrous alloys containing Mn
    • 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
    • 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
    • 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
    • C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
    • 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
    • C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/26—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
    • C22C38/32—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
    • C22C38/34—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of silicon
    • 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
    • C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
    • C23C2/022—Pretreatment of the material to be coated, e.g. for coating on selected surface areas by heating
    • C23C2/0224—Two or more thermal pretreatments
    • 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
    • C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
    • C23C2/024—Pretreatment of the material to be coated, e.g. for coating on selected surface areas by cleaning or etching
    • 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
    • C23C2/06—Zinc or cadmium 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
    • C23C2/28—Thermal after-treatment, e.g. treatment in oil bath
    • 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
    • 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
    • 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
    • C21D2211/008—Martensite
    • 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
    • C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals

Definitions

  • WO 2009/035576 A1 is directed to a method and apparatus of producing a dual-phase galvanized steel strip with improved formability while maintaining a high tensile strength. According to the disclosed process, the retained austenite is stabilized by bainite formation. The document does not disclose cooling of a steel that results in a transform of austenite to martensite.
  • EP2325346 (A1 ) discloses a high-strength steel alloys wherein the austenite content is in the range of 5% to 50%, and the proportion of the area of bainitic ferrite in upper bainite is 5% or more. Bainite formation is encouraged to stabilize retained austenite. The document does not disclose cooling of a steel that results in a transform of austenite to martensite.
  • EP2524970 (A1 ) discloses a method for manufacturing a high-strength flat steel product.
  • any coating process such as hot dip coating processes, takes place after the heat treatment of the flat steel product is finished, i.e. after stabilizing austenite through a partitioning step.
  • the document does not disclose a process comprising stabilizing austenite after hot dip coating of the steel sheet.
  • the present invention relates to processing methods for production of steel using hot-dip galvanizing/galvannealing (HDG) processes such that the resulting steel exhibits high strength and cold formability.
  • HDG hot-dip galvanizing/galvannealing
  • a modified HDG process for steel is provided that produces a resulting microstructure consisting of generally martensite and austenite (among other constituents).
  • the composition includes certain alloying additions and the HDG process includes certain process modification, all of which are at least partially related to driving the transformation of austenite to martensite followed by a partial stabilization of austenite at room-temperature.
  • FIG. 1 shows a schematic representation of the thermal cycle used to achieve high strength and cold formability in a steel sheet having a certain chemical composition (described in greater detail below).
  • FIG. 1 shows a typical hot-dip galvanizing or galvannealing thermal profile (10) with process modifications shown with dashed lines.
  • the process generally involves austenitization followed by a rapid cooling to a specified quench temperature to partially transform austenite to martensite, and the holding at an elevated temperature, a partitioning temperature, to allow carbon to diffuse out of martensite and into the remaining austenite, thus, stabilizing the austenite at room temperature.
  • the thermal profile shown in FIG. 1 may be used with conventional continuous hot-dip galvanizing or galvannealing production lines, although such a production line is not required.
  • the steel sheet is first heated to a peak metal temperature (12).
  • the peak metal temperature (12) in the illustrated example is shown as being at least above the austenite transformation temperature (A 1 ) (e.g., the dual phase, austenite + ferrite region).
  • a 1 austenite transformation temperature
  • FIG. 1 shows the peak metal temperature (12) as being solely above A 1 , it should be understood that in some embodiments the peak metal temperature may also include temperatures above the temperature at which ferrite completely transforms to austenite (A 3 ) (e.g., the single phase, austenite region).
  • the steel sheet undergoes rapid cooling.
  • some embodiments may include a brief interruption in cooling for galvanizing or galvannealing.
  • the steel sheet may briefly maintain a constant temperature (14) due to the heat from the molten zinc galvanizing bath.
  • a galvannealing process may be used and the temperature of the steel sheet may be slightly raised to a galvannealing temperature (16) where the galvannealing process may be performed.
  • the galvanizing or galvannealing process may be omitted entirely and the steel sheet may be continuously cooled.
  • the rapid cooling of the steel sheet is shown to continue below the martensite start temperature (M S ) for the steel sheet to a predetermined quench temperature (18).
  • M S martensite start temperature
  • the cooling rate to M s has to be high enough to transform at least some of the austenite formed at the peak metal temperature (12) to martensite.
  • the cooling rate must be rapid enough to transform austenite to martensite instead of other non-martensitic constituents such as ferrite, pearlite, or bainite which transform at relatively lower cooling rates.
  • the quench temperature (18) is below M.
  • the difference between the quench temperature (18) and M s may vary depending an the individual composition of the steel sheet being used. However, in many embodiments the difference between quench temperature (18) and M s should be sufficiently great to form an adequate amount of martensite to act as a carbon source to stabilize the austenite and avoid creating excessive "fresh" martensite upon final cooling. Additionally, quench temperature (18) should be sufficiently high to avoid consuming too much austenite during the initial quench (e.g., to avoid excessive carbon enrichment of austenite greater than that required to stabilize austenite for the given embodiment).
  • quench temperature (18) may vary from about 191 °C to about 281 °C, although no such limitation is required. Additionally, quench temperature (18) may be calculated for a given steel composition. For such a calculation, quench temperature (18) corresponds to the retained austenite having an Ms temperature of room temperature after partitioning. Methods for calculating quench temperature (18) are known in the art and described in J. G. Speer, A. M. Streicher, D. K. Matlock, F. Rizzo, and G. Krauss, "Quenching And Partitioning : A Fundamentally New Process to Create High Strength Trip Sheet Microstructures," Austenite Formation and Decomposition, pp. 505-522, 2003 ; and A. M. Streicher, J.
  • the quench temperature (18) should be sufficiently low (with respect to M s ) to form an adequate amount of martensite to act as a carbon source to stabilize the austenite and avoid creating excessive "fresh" martensite upon the final quench.
  • the quench temperature (18) should be sufficiently high to avoid consuming too much austenite during the initial quench and creating a situation where the potential carbon enrichment of the retained austenite is greater than that required for austenite stabilization at room temperature.
  • a suitable quench temperature (18) may correspond to the retained austenite having an M s temperature of room temperature after partitioning. Speer and Streicher et al. (above) have provided calculations that provide guidelines to explore processing options that may result in desirable microstructures.
  • the result of the calculations described by Speer et al. may indicate a quench temperature (18) which may lead to a maximum amount of retained austenite.
  • quench temperatures (18) above the temperature having a maximum amount of retained austenite significant fractions of austenite are present after the initial quench; however, there is not enough martensite to act as a carbon source to stabilize this austenite. Therefore, for the higher quench temperatures, increasing amounts of fresh martensite form during the final quench.
  • For quench temperatures below the temperature having a maximum amount of retained austenite an unsatisfactory amount of austenite may be consumed during the initial quench and there may be an excess amount of carbon that may partition from the martensite.
  • the temperature of the steel sheet is either increased relative to the quench temperature or maintained at the quench temperature for a given period of time.
  • this stage may be referred to as the partitioning stage.
  • the temperature of the steel sheet is at least maintained at the quench temperature to permit carbon diffusion from martensite formed during the rapid cooling and into any remaining austenite. Such diffusion permits the remaining austenite to be stable (or meta-stable) at room temperature, thus improving the mechanical properties of the steel sheet.
  • the steel sheet may be heated above M s to a relatively high partitioning temperature (20) and thereafter held at the high partitioning temperature (20).
  • a variety of methods may be utilized to heat the steel sheet during this stage.
  • the steel sheet may be heated using induction heating, torch heating, and/or the like.
  • the steel sheet may be heated but to a different, lower partitioning temperature (22) which is slightly below M s .
  • the steel sheet may then be likewise held at the lower partitioning temperate (22) for a certain period of time.
  • another alternative partitioning temperature (24) may be used where the steel sheet is merely maintained at the quench temperature.
  • any other suitable partitioning temperature may be used as will be apparent to those of ordinary skill in the art in view of the teachings herein.
  • the steel sheet After the steel sheet has reached the desired partitioning temperature (20, 22, 24), the steel sheet is maintained at the desired partitioning temperature (20, 22, 24) for a sufficient time to permit partitioning of carbon from martensite to austenite. The steel sheet may then be cooled to room temperature.
  • FIG. 2 shows an alternative further disclosed as background art of the thermal cycle described above with respect to FIG. 1 (with a typical galvanizing/galvannealing thermal cycle shown with a solid line (40) and departures from typical shown with a dashed line).
  • the steel sheet is first heated to a peak metal temperature (42).
  • the peak metal temperature (42) in the illustrated background art is shown as being at least above A 1 .
  • the peak metal temperature (42) at least a portion of the steel sheet will be transformed to austenite.
  • this further disclosed background art may also include a peak metal temperature in excess of A3.
  • quench (44) may be then ceased at a quench temperature (46).
  • quench temperature (46) is below A.
  • Ms may vary depending upon the material used.
  • the difference between quench temperature (46) and Ms may be sufficiently great to form an adequate amount of martensite yet be sufficiently low to avoid consuming too much austenite.
  • the steel sheet is then subsequently reheated (48) to a partitioning temperature (50, 52).
  • the partitioning temperature (50, 52) may be characterized by the galvanizing or galvannealing zinc bath temperature (if galvanizing or galvannealing is so used).
  • the steel sheet may be re-heated to the galvanizing bath temperature (50) and subsequently held there for the duration of the galvanizing process.
  • partitioning may occur similar to the partitioning described above.
  • the galvanizing bath temperature (50) may also function as the partitioning temperature (50).
  • the process may be substantially the same with the exception of a higher bath/partitioning temperature (52).
  • the steel sheet is further permitted to cool (54) to room temperature where at least some austenite may be stable (or meta-stable) from the partitioning step described above.
  • the steel sheet includes certain alloying additions to improve the propensity of the steel sheet to form a primarily austenitic and martensitic microstructure and/or to improve the mechanical properties of the steel sheet.
  • Suitable compositions of the steel sheet include the following, by weight percent: 0.15-0.4% carbon, 1.5-4% manganese, 0-2% silicon or aluminum or some combination thereof, 0-0.5% molybdenum, 0-0.05% niobium, other incidental elements, and the balance being iron.
  • compositions of a steel including one or more of the following, by weight percent: 0.15-0.5% carbon, 1-3% manganese, 0-2% silicon or aluminum or some combination thereof, 0-0.5% molybdenum, 0-0.05% niobium, other incidental elements, and the balance being iron.
  • steel compositions of the further disclosed background art may include additions of vanadium and/or titanium in addition to, or in lieu of niobium, although such additions are entirely optional.
  • carbon is used to stabilize austenite. For instance, increasing carbon may lower the Ms temperature, lower transformation temperatures for other non-martensitic constituents (e.g., bainite, ferrite, pearlite), and increase the time required for non-martensitic products to form. Additionally, carbon additions may improve the hardenability of the material thus retaining formation of non-martensitic constituents near the core of the material where cooling rates may be locally depressed. However, it should be understood that carbon additions may be limited as significant carbon additions may lead to detrimental effects on weldability.
  • non-martensitic constituents e.g., bainite, ferrite, pearlite
  • Manganese provides additional stabilization of austenite by lowering transformation temperatures of other non-martensitic constituents, as described above. Manganese may further improve the propensity of the steel sheet to form a primarily austenitic and martensitic microstructure by increasing hardenability.
  • molybdenum may be used to increase hardenability.
  • silicon and/or aluminum may be provided to reduce the formation of carbides. It should be understood that a reduction in carbide formation may be desirable in some embodiments because the presence of carbides may decrease the levels of carbon available for diffusion into austenite. Thus, silicon and/or aluminum additions may be used to further stabilize austenite at room temperature.
  • nickel, copper, and chromium may be used to stabilize austenite. For instance, such elements may lead to a reduction in the M s temperature. Additionally, nickel, copper, and chromium may further increase the hardenability of the steel sheet.
  • niobium may be used to increase the mechanical properties of the steel sheet.
  • niobium may increase the strength of the steel sheet through grain boundary pinning resulting from carbide formation.
  • other micro-alloying elements such astitanium, vanadium, and/or the like may be used to increase the mechanical properties
  • the materials were processed with a laboratory equipment according to the following parameters. Each sample was subjected to Gleeble 1500 treatments using copper cooled wedge grips and the pocket jaw fixture. Samples were austenitized at 1100°C and than cooled to room temperature at various cooling rates between 7-70°C/s. Table 1 Chemical compositions in weight %.
  • FIGS. 6-8 Light optical micrographs were taken in the longitudinal through thickness direction near the center of each sample for each of the compositions of Example 1. The results of these tests are shown in FIGS. 6-8 .
  • the compositions V4037, V4038, and V4039 correspond to FIGS. 6 , 7 , and 8 , respectively. Additionally, FIGS. 6-8 each contain six micrographs for each composition with each micrograph representing a sample subjected to a different cooling rate.
  • a critical cooling rate for each of the compositions of Example 1 was estimated using the data of Examples 2 and 3 in accordance with the procedure described herein.
  • the critical cooling rate herein refers to the cooling rate required to form martensite and minimize the formation of non-martensitic transformation products. The results of these tests are as follows: V4037: 70 °C/s V4038: 75 °C/s V4039: 7 °C/s
  • Example 5 The compositions of Example 5 were subjected to Gleeble dilatomety. Gleeble dilatomety was performed in vacuum using a 101.6x25.4x1 mm samples with a c-strain gauge measuring dilation in the 25.4 mm direction. Plots were generated of the resulting dilation vs. temperature. Line segments were fit to the dilatometric data and the point at which the dilatometric data deviated from linear behavior was taken as the transformation temperature of interest (e.g., A 1 , A 3 , M s ). The resulting transformation temperatures are tabulated in Table 5.
  • the transformation temperature of interest e.g., A 1 , A 3 , M s
  • Gleeble methods were also used to measure a critical cooling rate for each of the compositions of Example 5.
  • the first method utilized Gleeble dilatomety, as described above.
  • the second method utilized measurements of Rockwell hardness.
  • Rockwell hardness measurements were taken after samples were subjected to Gleeble testing at range of cooling rates.
  • Rockwell hardness measurements were taken.
  • Rockwell hardness measurements were taken for each material composition with a measurement of hardness for a range of cooling rates.
  • a comparison was then made between the Rockwell hardness measurements of a given composition at each cooling rate.
  • Rockwell hardness deviations of 2 points HRA were considered significant.
  • the critical cooling rate to avoid non-martensitic transformation product was taken as the highest cooling rate for which the hardness was lower than 2 point HRA than the maximum hardness.
  • Example 5 The compositions of Example 5 were used to calculate quench temperature and a theoretical maximum of retained austenite. The calculations were performed using the methods of Speer et al. , described above. The results of the calculations are tabulated below in Table 6 for some of the compositions listed in Example 5. Table 6 - Quench Temperature and Theoretical Maximum of Retained Austenite Heat QT (°C) f( ⁇ ) Theoretical Maximum V4037 281 0.15 V4063 278 0.15 V4038 270 0.18 V4039 203 0.2 V4060 191 0.35 V4061 196 0.36 V4062 237 0.31 V4078-1 276 0.16 V4078-2 276 0.16 V4079-1 273 0.16 V4079-2 272 0.16
  • compositions of Example 5 were subjected to the thermal profiles shown in FIGS. 1 and 2 with peak metal temperature and quench temperature varied between samples of a given composition. As described above, only composition V4039 was subjected to the thermal profile shown in FIG. 1 , while all other compositions were subjected to the thermal cycle shown in FIG. 2 . For each sample, tensile strength measurements were taken. The resulting tensile measurements are plotted in FIGS. 9-12 . In particular, FIGS. 9-10 show tensile strength data plotted against austenitization temperature and FIGS. 11-12 show tensile strength data plotted against quench temperature. Additionally, where the thermal cycles were performed using Gleeble methods, such data points are denoted with "Gleeble.” Similarly, where thermal cycles were performed using a salt bath, such data points are denoted with "salt.”

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Claims (4)

  1. Verfahren zur Herstellung eines feuerverzinkten/galvannealten Stahlblechs, wobei das Stahlblech aus den folgenden Elementen nach Gewichtsprozenten besteht: 0,15 - 0,4 % Kohlenstoff;
    1,5 - 4 % Mangan;
    2 % oder weniger Silizium, Aluminium oder eine Kombination davon;
    0,5 % oder weniger Molybdän;
    0,05 % oder weniger Niob;
    Rest Eisen oder andere übliche Verunreinigungen;
    wobei das Stahlblech eine Mikrostruktur aufweist, welche im Wesentlichen aus Martensit und Austenit besteht;
    wobei das Verfahren die Schritte umfasst:
    (a) Erhitzen des Stahlblechs auf eine erste Temperatur T1, wobei T1 mindestens über der Temperatur liegt, bei welcher das Stahlblech zu Austenit und Ferrit transformiert;
    (b) Abkühlen des Stahlblechs auf eine zweite Temperatur T2, welche in Bezug auf die Martensit-Starttemperatur Ms ausreichend niedrig ist, um eine ausreichende Menge Martensit zu bilden, um als Kohlenstoffquelle zu dienen, um das Austenit zu stabilisieren und die Bildung von überschüssigem "frischem" Martensit beim abschließenden Quenchen zu vermeiden, und welche ausreichend hoch ist, um den Verbrauch von zu viel Austenit während des initialen Quenchens durch Kühlen bei einer Kühlrate zu vermeiden, wobei T2 unter der Martensit-Starttemperatur Ms liegt, wobei die Kühlrate ausreichend schnell ist, um Austenit in Martensit zu transformieren und die Bildung von nicht-martensitischen Transformationsprodukten zu vermeiden;
    (c) Unterziehen des Stahlblechs einer Feuerverzinkung oder Galvannealung während des Abkühlens des Stahlblechs auf T2;
    (d) Wiedererhitzen des Stahlblechs auf eine Partitionierungstemperatur, wobei die Partitionierungstemperatur ausreichend ist, um eine Diffusion von Kohlenstoff innerhalb der Struktur des Stahlblechs zuzulassen;
    (e) Stabilisieren von Austenits durch Halten des Stahlblechs bei einer Partitionierungstemperatur für eine Haltezeit, wobei die Haltezeit eine Zeitspanne ist, welche ausreichend ist, um Diffusion von Kohlenstoff von Martensit zu Austenit zuzulassen; und
    (f) Kühlen des Stahlblechs auf Raumtemperatur.
  2. Verfahren nach Anspruch 1, wobei Feuerverzinken oder Galvannealen oberhalb Ms erfolgt.
  3. Verfahren nach Anspruch 1, wobei die Partitionierungstemperatur oberhalb von Ms ist.
  4. Verfahren nach Anspruch 1, wobei die Partitionierungstemperatur unterhalb von Ms ist.
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