WO2013031984A1 - 熱間プレス成形品およびその製造方法 - Google Patents

熱間プレス成形品およびその製造方法 Download PDF

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Publication number
WO2013031984A1
WO2013031984A1 PCT/JP2012/072246 JP2012072246W WO2013031984A1 WO 2013031984 A1 WO2013031984 A1 WO 2013031984A1 JP 2012072246 W JP2012072246 W JP 2012072246W WO 2013031984 A1 WO2013031984 A1 WO 2013031984A1
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Prior art keywords
steel sheet
temperature
plating layer
hot
hot press
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Ceased
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PCT/JP2012/072246
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English (en)
French (fr)
Japanese (ja)
Inventor
圭介 沖田
池田　周之
純也 内藤
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Kobe Steel Ltd
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Kobe Steel Ltd
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Publication date
Application filed by Kobe Steel Ltd filed Critical Kobe Steel Ltd
Priority to ES12827602.9T priority Critical patent/ES2586555T3/es
Priority to CN201280041922.6A priority patent/CN103764310B/zh
Priority to IN1542CHN2014 priority patent/IN2014CN01542A/en
Priority to EP12827602.9A priority patent/EP2752257B1/en
Priority to US14/240,595 priority patent/US20140186655A1/en
Priority to KR1020147005080A priority patent/KR20140041907A/ko
Publication of WO2013031984A1 publication Critical patent/WO2013031984A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/01—Layered products comprising a layer of metal all layers being exclusively metallic
    • B32B15/011—Layered products comprising a layer of metal all layers being exclusively metallic all layers being formed of iron alloys or steels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • 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
    • 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
    • B21D37/00—Tools as parts of machines covered by this subclass
    • B21D37/16—Heating or cooling
    • 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
    • B32B15/013—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 a metal other than iron or aluminium
    • 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
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C18/00—Alloys based on zinc
    • 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
    • C22C38/001—Ferrous alloys, e.g. steel alloys containing N
    • 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
    • C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
    • 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
    • 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
    • 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
    • C23C2/26—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
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
    • Y10T428/12771—Transition metal-base component
    • Y10T428/12785—Group IIB metal-base component
    • Y10T428/12792—Zn-base component
    • Y10T428/12799—Next to Fe-base component [e.g., galvanized]

Definitions

  • the present invention relates to a hot press-formed product that requires strength and corrosion resistance as used in structural members of automobile parts and a method for manufacturing the same, and in particular, a preheated surface-treated steel sheet is formed into a predetermined shape.
  • the present invention relates to a hot press-formed product that is quenched at the same time as shape imparting to obtain a predetermined strength, and a method for producing such a hot press-formed product.
  • the steel sheet (work material) is heated to a predetermined temperature (for example, a temperature at which it becomes an austenite phase) to reduce the strength (that is, to facilitate forming), and then the thin steel sheet.
  • a predetermined temperature for example, a temperature at which it becomes an austenite phase
  • Hot press molding that secures the strength after molding by forming a mold at a low temperature (for example, room temperature) compared to, and by applying a quenching heat treatment (quenching) using the temperature difference between the two at the same time as giving the shape.
  • the method is adopted in parts manufacturing.
  • Such a hot press molding method since the molding is performed in a low strength state, the spring back is reduced (good shape freezing property), and a strength of 1500 MPa class is obtained as a tensile strength by rapid cooling.
  • a hot press forming method is called by various names such as a hot forming method, a hot stamping method, a hot stamp method, and a die quench method in addition to the hot press method.
  • FIG. 1 is a schematic explanatory view showing a mold configuration for carrying out the above hot press molding (hereinafter may be represented by “hot stamp”).
  • 3 is a blank holder
  • 4 is a steel plate (blank)
  • BHF is a crease pressing force
  • rp is a punch shoulder radius
  • rd is a die shoulder radius
  • CL is a punch / die clearance.
  • the punch 1 and the die 2 have passages 1a and 2a through which a cooling medium (for example, water) can pass, and the cooling medium is allowed to pass through the passages.
  • a cooling medium for example, water
  • the steel plate (blank) 4 is set to the two-phase region temperature (Ac 1 transformation point to Ac 3 transformation point) or higher than the Ac 3 transformation point. Molding is started in a state of being softened by heating to a single phase temperature. That is, in a state where the steel plate 4 in a high temperature state is sandwiched between the die 2 and the blank holder 3, the steel plate 4 is pushed into the hole of the die 2 (between 2 and 2 in FIG. 1) by the punch 1, and the outer diameter of the steel plate 4 is reduced. While shrinking, it is formed into a shape corresponding to the outer shape of the punch 1.
  • a method (direct method) is shown in which a hot press-formed product having a simple shape as shown in FIG. 1 is simultaneously formed and quenched in a mold from the stage of a steel plate.
  • the hot pressing method applied in (1) is not limited to the case of applying to such a construction method, but can also be applied to the case of manufacturing a molded product having a relatively complicated shape.
  • a method of performing cold press forming in a pre-process of hot press forming can be employed (this method is called “indirect method”).
  • the indirect method is a method in which a portion that is difficult to be molded is preliminarily molded to an approximate shape by cold working, and the other portions are hot press molded. If such a method is adopted, for example, when a part having three uneven portions (mountains) of a molded product is formed, the two parts are formed by cold press molding, and then the third part is formed. Will be hot pressed.
  • a surface-treated steel sheet obtained by applying aluminum plating, galvanizing, alloyed hot dip galvanizing, etc. to a press-molding material (base steel sheet) is also used.
  • base steel sheet a surface-treated steel sheet obtained by applying aluminum plating, galvanizing, alloyed hot dip galvanizing, etc. to a press-molding material (base steel sheet)
  • galvanized or alloyed hot-dip galvanized steel sheet it is considered preferable to apply galvanized or alloyed hot-dip galvanized steel sheet, but zinc has a melting point and boiling point that are hot pressed.
  • the temperature range to be performed it becomes a liquid phase or a gas phase, so that the plating layer transpirations and oxidation occurs during hot pressing, and the obtained surface-treated steel sheet is excessively alloyed with the base steel sheet, and the zinc to the press die It is easy to cause remarkable deterioration of welding, corrosion resistance and weldability.
  • Patent Documents 1 and 2 As a method for avoiding such problems, techniques such as Patent Documents 1 and 2 have been proposed.
  • the basic idea of these techniques is to raise the melting point of the plating layer by forming a Zn—Fe-based plating layer containing a predetermined amount of Fe on the substrate surface.
  • a Zn-Fe plating layer When a Zn-Fe plating layer is employed as the plating layer, an effect of increasing the melting point of the plating layer can be expected, but for example, about 70% by mass of Fe must be contained in order to obtain a melting point of 900 ° C. or higher.
  • deterioration of corrosion resistance, coating film adhesion, and weldability is increased.
  • the alloying progresses, the oxidation reaction is also promoted, resulting in problems such as dropping of the oxide layer and poor adhesion after painting.
  • the melting point becomes as low as about 670 ° C., and the liquid phase comes into contact with the mold to cause welding or galling. become.
  • zinc melted during hot pressing penetrates into the grain boundaries of the steel sheet, causing liquid metal embrittlement (hereinafter sometimes abbreviated as “LME”), and causing the grain boundary cracking.
  • LME liquid metal embrittlement
  • Patent Document 3 discloses a method in which a galvanized steel sheet provided with a galvanized layer is heated to a predetermined temperature, cooled to 730 ° C. or lower and 500 ° C. or higher within 60 seconds, and then hot-formed. Yes.
  • this technique also includes conditions for forming the plating layer in a molten state, and therefore, peeling of the plating layer and intergranular cracking cannot be completely avoided.
  • the amount of Fe contained in the zinc-based plating layer is 15% by mass, since it does not enter the complete solid phase region unless it is 685 ° C. or lower, cooling is insufficient at 700 ° C., for example.
  • the present invention has been made in view of the above circumstances, and an object of the present invention is to perform hot press forming using a surface-treated steel sheet on which a Zn-Fe-based plating layer is formed.
  • An object of the present invention is to provide a useful method for producing a hot press-formed product having good characteristics while avoiding peeling and intergranular cracking of a base material, and a hot press-formed product obtained by such a method.
  • the method of the present invention that has achieved the above object is to produce a hot press-formed product by forming a surface-treated steel sheet having a Zn-Fe-based plating layer formed on the surface of the base steel sheet by a hot press forming method.
  • the surface-treated steel sheet was heated to a temperature not lower than the Ac 1 transformation point of the base steel sheet and not higher than 950 ° C., and the surface-treated steel sheet was cooled to a temperature not higher than the freezing point of the plated layer corresponding to the Fe content in the plated layer. After that, it has a gist in that the molding is started.
  • the average cooling rate when cooling to a temperature below the freezing point of the plating layer is preferably 20 ° C./second or more (more preferably 30 ° C./second or more). Moreover, it is preferable to start molding at a temperature higher than the martensitic transformation start temperature and to finish at a temperature lower than the martensitic transformation start temperature.
  • the present invention during hot press forming using a surface-treated steel sheet on which a Zn—Fe-based plating layer is formed, by appropriately controlling the conditions, peeling of the plating layer or grains during press forming can be performed.
  • a hot press-molded product having good characteristics can be realized by avoiding boundary cracking.
  • FIG. 1 is a schematic explanatory view showing a mold configuration for carrying out hot press molding.
  • FIG. 2 is a Zn—Fe binary system state diagram.
  • FIG. 3 is a schematic diagram showing an image of a heat pattern.
  • FIG. 4 is a schematic explanatory view showing a mold configuration in the embodiment.
  • the present inventors heated the surface-treated steel sheet on which the Zn—Fe-based plating layer was formed to a predetermined temperature and then performed hot press molding to produce a molded product. In order to avoid the intergranular cracking and realize a hot press-formed product with good characteristics, we examined it from various angles.
  • the surface-treated steel sheet is converted into an Ac 1 transformation of the base steel sheet. If the surface treatment steel sheet is heated to a temperature not lower than the point and not higher than 950 ° C. and the surface-treated steel sheet is cooled to a temperature not higher than the freezing point of the plating layer according to the Fe content in the plating layer, the forming is started as described above.
  • the present invention has been completed by finding that an excellent hot press-formed product with good characteristics can be realized without causing any inconvenience.
  • the present inventors further examined the molding temperature, the moldability, the state of the plating layer during molding, and the like. As a result, after heating to a predetermined temperature and then cooling the surface-treated steel sheet to a temperature below the freezing point of the plating layer, forming is started without inconvenience such as plating layer peeling and intergranular cracking. Moreover, it has been found that the moldability is also good.
  • the surface-treated steel sheet is converted into an Ac 1 transformation of a base steel sheet. It is necessary to heat to a temperature not lower than the point and not higher than 950 ° C. In order to exhibit the effect of the hot pressing method, the heating temperature needs to be at least the Ac 1 transformation point of the base steel sheet. When the heating temperature is less than the Ac 1 transformation point, an appropriate amount of austenite cannot be obtained during heating, and good moldability cannot be ensured.
  • the heating temperature exceeds 950 ° C., zinc in the galvanized layer is boiled and evaporated, and the corrosion resistance is deteriorated.
  • the preferable lower limit of the heating temperature is more than Ac 3 transformation point of the base steel sheet (the temperature at which all the austenite), preferably the upper limit is less than 930 ° C..
  • FIG. 2 is a Zn—Fe binary system state diagram.
  • the broken line portion in the figure indicates the boundary between the region containing the liquid phase and the region of the solid phase (ie, corresponding to the freezing point: indicated by “Fp” in the drawing), and the region below this boundary is the solid phase region. Since the Zn-Fe-based plating layer has a different Fp temperature depending on the Fe content in the plating layer, it is cooled so that the temperature of the plating layer before forming becomes Fp (corresponding to the freezing point) or less according to the Fe content. I do.
  • FIG. 3 (a) shows an image of a conventional heat pattern, in which molding is started (and finished) at a temperature higher than Fp in a state (without cooling) as it is after heating. Show.
  • FIG.3 (b) shows the image of the heat pattern of this invention, and has shown forming, after cooling to temperature lower than Fp.
  • the “freezing point of the plating layer” which serves as a reference for cooling means the freezing point before forming (that is, before heating).
  • the Fe content in the plating layer increases, and the freezing point of the plating layer also increases.
  • LME can be suppressed without cooling to the freezing point before heating.
  • LME is not suppressed unless it is cooled to a temperature lower than the freezing point before heating. The reason for this is not clarified all, but although the average Fe content in the plating layer is probably increased by heating, the alloying has not progressed locally (that is, before heating). It is presumed that this determines the temperature at which the LME is generated. That is, it is an important point for LME countermeasures to cool to a temperature not higher than the solidification temperature before heating determined by the ratio of Fe and Zn in the plating layer.
  • n value work hardening coefficient
  • the average cooling rate at the time of cooling preferably secures an average cooling rate of 20 ° C./second or more in order to make the plating layer as solid as possible. More preferably, it is 30 ° C./second or more.
  • the forming start time is after cooling to at least the solidification point of the plating layer, but it is preferable that all of the plating layer is solidified. Moreover, it is desirable that the temperature be higher than the martensite transformation start temperature Ms point from the viewpoint of press reaction force and formability. Furthermore, in order to ensure the strength of the part after molding, it is preferable to cool to at least a temperature lower than the martensitic transformation temperature Ms point.
  • a surface-treated steel sheet on which a Zn—Fe-based plating layer is formed is hot-press formed.
  • the steel sheet of the surface-treated steel sheet (base steel sheet) is generally used as a high-strength steel sheet. (See Table 1 in Examples below).
  • the Fe content in the Zn—Fe-based plating layer formed on the surface of the base steel plate is not particularly limited, and if it is 5% by mass or more (more preferably 10% by mass or more), the plating layer Although exhibiting the function, if the Fe content is excessive, corrosion resistance, coating film adhesion, weldability and the like are liable to deteriorate. Therefore, the content is preferably 80% by mass or less (more preferably 60% by mass or less, further Preferably it is 30 mass% or less).
  • the Zn—Fe-based plating layer may contain alloy elements other than Fe (eg, Al, Mn, Ni, Cr, Co, Mg, Sn, Pb, etc.) up to about 3.3 mass%. These elements have little influence on the freezing point at the content level.
  • the Zn—Fe plating layer has some inevitable impurities such as Be, B, Si, P, Ti, V, W, Mo, Sb, Cd, Nb, Cu, and Sr. May also be included.
  • the desirable plating adhesion amount is 90 g / m 2 or less (more preferably 80 g / m 2 or less) per side and 10 g / m 2 or more (more preferably 20 g / m 2 or more).
  • a steel material having the chemical composition shown in Table 1 below was vacuum-melted to obtain a slab for experiment, then hot rolled, and then cooled and wound up. Furthermore, it cold-rolled to make a thin steel plate (base steel plate).
  • the Ac 1 transformation point and Ms point in Table 1 were determined using the following formulas (1) and (2) (see, for example, “Leslie Steel Material Science” Maruzen, (1985)). .
  • a Zn—Fe-based plating layer (Fe content: 12 mass%, solidification point: 665 ° C.) was formed on the surface of the obtained base steel sheet (adhesion amount on one side: 50 g / m 2 ). After heating under conditions, cooling treatment was performed by air cooling or air cooling in which cooled air was blown, and then molding was performed. At this time, an electric furnace was used as a heating method, and heating was performed in the atmosphere at a predetermined temperature and time. The size of the steel plate during cooling was 50 mm ⁇ 250 mm (plate thickness: 1.4 mm).
  • Test No. 1 2, 8, 10, 11, 14, 17, and 18 were molded under conditions that deviated from the requirements defined in the present invention, that is, at a temperature higher than the freezing point before heating of the plating layer.
  • test No. No. 1 has a very high molding start temperature, and thus tends to have a temperature distribution in the material generated during molding, and particularly, the deformation concentrated on the vertical wall which is difficult to contact with the mold and difficult to be cooled, and broke (formability). : "X").
  • test no. In the case of No. 9, although peeling of the plating layer and cracking of the base metal grain boundary did not occur (both were evaluated “ ⁇ ”), the cooling rate was insufficient, the bainite transformation occurred in the cooling process, and sufficient strength (hardness) Is not obtained.
  • test no. 7 peeling of the plating layer and cracking of the base metal grain boundary did not occur (both were evaluated as “ ⁇ ”), but since the molding was started at a temperature below the Ms point, martensitic transformation occurred and the moldability was remarkable. It fell and broke during processing.
  • test No. within the scope of the present invention. 3, 4, 5, 6, 12, 13, 15, 16, 19, without peeling of the plating layer or grain boundary cracking of the base material (surface property of molded product, base material grain boundary cracking: ⁇ ”) and strength (hardness) is sufficiently obtained (Hv: 450 or more), and a good hot press-formed product can be obtained.
  • a surface-treated steel sheet having a Zn—Fe-based plating layer formed on the surface of the base steel sheet is heated to a temperature not lower than the Ac 1 transformation point of the base steel sheet and not higher than 950 ° C., according to the Fe content in the plating layer.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Metallurgy (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Heat Treatment Of Articles (AREA)
  • Other Surface Treatments For Metallic Materials (AREA)
  • Heat Treatment Of Sheet Steel (AREA)
  • Coating With Molten Metal (AREA)
PCT/JP2012/072246 2011-09-01 2012-08-31 熱間プレス成形品およびその製造方法 Ceased WO2013031984A1 (ja)

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ES12827602.9T ES2586555T3 (es) 2011-09-01 2012-08-31 Pieza moldeada estampada en caliente y método de fabricación de la misma
CN201280041922.6A CN103764310B (zh) 2011-09-01 2012-08-31 热压成形品及其制造方法
IN1542CHN2014 IN2014CN01542A (https=) 2011-09-01 2012-08-31
EP12827602.9A EP2752257B1 (en) 2011-09-01 2012-08-31 Hot-stamp molded part and method for manufacturing same
US14/240,595 US20140186655A1 (en) 2011-09-01 2012-08-31 Press hardened parts and method of producing the same
KR1020147005080A KR20140041907A (ko) 2011-09-01 2012-08-31 열간 프레스 성형품 및 그 제조 방법

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US20140186655A1 (en) 2014-07-03
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CN103764310B (zh) 2015-09-30
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