US20130136945A1 - Tailored Properties By Post Hot Forming Processing - Google Patents

Tailored Properties By Post Hot Forming Processing Download PDF

Info

Publication number
US20130136945A1
US20130136945A1 US13/811,980 US201113811980A US2013136945A1 US 20130136945 A1 US20130136945 A1 US 20130136945A1 US 201113811980 A US201113811980 A US 201113811980A US 2013136945 A1 US2013136945 A1 US 2013136945A1
Authority
US
United States
Prior art keywords
region
shaped product
canceled
product
tensile strength
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.)
Abandoned
Application number
US13/811,980
Other languages
English (en)
Inventor
Pascal P. Charest
Nicholas D. Adam
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Magna International Inc
Original Assignee
Magna International Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Magna International Inc filed Critical Magna International Inc
Priority to US13/811,980 priority Critical patent/US20130136945A1/en
Assigned to MAGNA INTERNATIONAL INC. reassignment MAGNA INTERNATIONAL INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ADAM, NICHOLAS D., CHAREST, PASCAL P.
Publication of US20130136945A1 publication Critical patent/US20130136945A1/en
Abandoned legal-status Critical Current

Links

Images

Classifications

    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
    • B21D22/02—Stamping using rigid devices or tools
    • B21D22/022—Stamping using rigid devices or tools by heating the blank or stamping associated with heat treatment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D31/00—Other methods for working sheet metal, metal tubes, metal profiles
    • 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
    • B21D53/00—Making other particular articles
    • B21D53/88—Making other particular articles other parts for vehicles, e.g. cowlings, mudguards
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/003—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor characterised by the choice of material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/32—Component parts, details or accessories; Auxiliary operations
    • B29C43/52—Heating or cooling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C71/00—After-treatment of articles without altering their shape; Apparatus therefor
    • B29C71/02—Thermal after-treatment
    • 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
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/34—Methods of heating
    • C21D1/53—Heating in fluidised beds
    • 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
    • C21D8/005—Modifying the physical properties by deformation combined with, or followed by, heat treatment 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/32—Component parts, details or accessories; Auxiliary operations
    • B29C43/52—Heating or cooling
    • B29C2043/522—Heating or cooling selectively heating a part of the mould to achieve partial heating, differential heating
    • 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
    • C21D2221/00—Treating localised areas of an article
    • 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
    • Y10T428/12458—All metal or with adjacent metals having composition, density, or hardness gradient

Definitions

  • the instant invention relates generally to shaped metallic products having tailored properties, and more particularly to a method of producing regions of reduced hardness and reduced strength in shaped products via post hot forming processing.
  • Patberg discloses a method of forming mild zones along a bend edge of a hot formed and press hardened component.
  • a laser beam is used to heat a narrow region of the component along the bend edge.
  • Patberg suggests that the heat that is produced by welding may result in the formation of mild zones adjacent to a weld joint.
  • the use of highly specialized laser equipment adds to the cost and complexity of the component.
  • this approach is not well suited either to batch processing or to applications requiring the formation of substantial regions having reduced tensile strength within the component.
  • a method of forming a shaped product from an initial blank in which the initial blank is subjected firstly to a hot forming and press hardening operation so as to form the shaped product with substantially a uniform first tensile strength.
  • the initial blank is heated to a temperature above its transition temperature Ac3, which is defined as the temperature at which transformation of ferrite into austenite is completed upon heating.
  • the initial blank is heated to approximately 950° C.
  • the heated initial blank is inserted into a cooled press having a pair of die halves, which is used for both hot forming and hardening the shaped product.
  • the press is subsequently closed, thereby deforming the initial blank such that it conforms to contours that are defined along facing surfaces of the die halves.
  • Deformation and concomitant rapid cooling of the initial blank within the die halves produces the desired shaped product, in which the austenite structure has been transformed into martensite structure.
  • the tensile strength and hardness of the shaped product is substantially uniform throughout.
  • the die halves are not cooled provided that a suitably rapid cooling rate of the shaped product can be achieved.
  • the temperature of the flow of hot air is selected to attain the known range of operating temperatures of the fluidized bed.
  • the first region is then cooled in such a way that the first region attains a second tensile strength that is substantially less than the first tensile strength.
  • the second thermal treatment at a temperature between approximately 370° C. and 800° C. results in a tempered martensite composition within the first region.
  • a particulate other than sand is used and/or a fluid other than hot air is used to form the fluidized bed.
  • the first region of the shaped product is gas-cooled.
  • the first region of the shaped product is cooled using another suitable cooling technique, such as for instance one of gas-blasting, fluidized bed cooling, die cooling, water/mist cooling, and cooling with the use of cooling fans/jets.
  • the shaped product is only partially immersed into the fluidized bed.
  • a portion of the shaped product corresponding to the first region is immersed into the fluidized bed and is heated to the known temperature.
  • Other portions of the shaped product, which are not immersed into the fluidized bed are cooled or insulated from being heated to the known temperature as a result of being placed in close proximity to the fluidized bed.
  • the shaped product is gripped using a cooled collar that surrounds a second region of the shaped product adjacent to the first region.
  • the cooled collar is immersed at least partially into the fluidized bed.
  • the second region of the shaped product is protected from being heated by using a curtain of a cooled gas such as for instance air, or by spraying or misting with a suitable cooling liquid.
  • the shaped product is immersed fully into the fluidized bed.
  • a collar surrounds a second region of the shaped product that is adjacent to the first region.
  • the collar may provide cooling functionality (e.g., a gas-cooled collar (such as air-cooled) or a liquid-cooled collar (such as water-cooled)) or the collar may be insulating, such that the second region of the shaped product is protected from being heated to the known temperature.
  • the collar both cools and insulates the second region of the shaped product.
  • a plurality of collars is used to protect a plurality of non-contiguous second regions from being heated to the known temperature.
  • a single collar surrounds and protects a plurality of second regions from being heated to the known temperature, whilst allowing at least one first region of the shaped product to be heated to the known temperature.
  • intermediate processing such as for instance forming and/or cutting and/or perforating, etc. is performed subsequent to the hot stamping and press hardening steps but prior to the post hot forming processing in the fluidized bed.
  • forming and/or cutting and/or perforating, etc. is performed subsequent to the post hot forming processing in the fluidized bed.
  • the hot forming and press hardening steps are omitted.
  • the product is roll formed from a coil of Ultra High Strength Steel and subjected subsequently to post-forming thermal treatment in a fluidized bed as described supra.
  • products may be formed having a geometry that is not sufficiently complex so as to require the use of hot forming and press hardening techniques.
  • the initial blank is formed from a coated material or an uncoated material.
  • a method of forming a shaped product from an initial blank comprising: heating the initial blank to an austenitizing temperature; hot-shaping the initial blank in a cooled pair of dies to form the shaped product; cooling the shaped product during a first period of time, using a rate of cooling that is sufficiently rapid to support formation of a martensitic structure within substantially the entire shaped product; at least partially immersing the shaped product into a fluidized bed that is maintained within a known range of operating temperatures, so as to selectively heat a first portion of the shaped product to a known temperature that is less than the austenitizing temperature, while simultaneously maintaining below the known temperature a second portion of the shaped product that is adjacent to the first portion; and, cooling the shaped product such that tempered martensite is formed within the first portion of the shaped product while at the same time the second portion of the shaped product remains substantially free of tempered martensite.
  • a method of forming a shaped product from an initial blank comprising: providing the initial blank; heating the initial blank to the austenite state; hot-shaping the initial blank in a cooled pair of dies to form the shaped product; hardening the entire shaped product while it is still inside the pair of dies by cooling the product using a rate of cooling that is sufficiently fast to form a martensitic structure; transferring the shaped and hardened product from the pair of dies to a fluidized bed that is maintained within a known range of operating temperatures; at least partially immersing the shaped and hardened product into the fluidized bed, so as to heat a first portion of the product to at least a predetermined first temperature, while at the same time maintaining a second portion of the product below a predetermined second temperature that is lower than the first temperature; removing the product from the fluidized bed; and, cooling the shaped product such that tempered martensite is formed within the first portion of the shaped product while at
  • a method of making a B column for an automobile comprising: providing a B column blank; heating the B column blank to the austenite state; hot-shaping the B column blank in a cooled pair of dies to form the B column; hardening the B column while it is still inside the pair of dies, by cooling the B column during a first period of time using a rate of cooling that is sufficiently rapid to support formation of a martensitic structure within substantially the entire B column; at least partially immersing the B column into a fluidized bed that is maintained within a known range of operating temperatures, so as to selectively heat a first portion of the B column above a known temperature that is less than the austenitizing temperature, while simultaneously maintaining below the known temperature a second portion of the B column that is adjacent to the first portion; and, cooling the B column such that tempered martensite is formed within the first portion of the B column while at the same time the second portion of the B column remains substantially free of tempered marten
  • a method of forming a shaped product from an initial blank comprises: providing an initial blank fabricated from an Ultra High Strength Steel; forming the shaped product from the initial blank; and, at least partially immersing the shaped product into a fluidized bed that is maintained within a known range of operating temperatures so as to selectively heat a first region of the shaped product to above a known temperature, while simultaneously maintaining below the known temperature a second region of the shaped product that is adjacent to the first region, and then cooling the first region such that the first region attains a second tensile strength that is substantially less than the first tensile strength.
  • FIG. 3 shows a collar box attached to the B column of FIG. 2 ;
  • FIG. 5 b is a plot showing tensile strength values (MPa) and elongation (%) values for the locations that are indicated in FIG. 5 a;
  • FIG. 5 c is a plot showing Vickers Hardness values as a function of distance within the transition zone between the first region and the second region;
  • FIG. 6 is a simplified flow diagram of a method according to an embodiment of the instant invention.
  • FIG. 7 is a simplified flow diagram of another method according to an embodiment of the instant invention.
  • FIG. 9 is a simplified flow diagram of still yet another method according to an embodiment of the instant invention.
  • FIG. 1 shown is a schematic illustration of a thermoforming line for a steel component, according to an embodiment of the instant invention.
  • the component that is produced in FIG. 1 is a B column for an automobile.
  • other types of components may be produced in a similar fashion.
  • An initial blank 100 is provided.
  • the initial blank 100 is stamped from a sheet of hardenable steel, such as Usibor® 1500P, Usibor® 1500, another suitable boron steel or any suitable hot stamp press hardened material.
  • the initial blank 100 is pre-shaped specifically for producing a B column, such as for instance by an additional cutting step or an additional cold forming step (not shown in FIG. 1 ).
  • the entire initial blank 100 is then heated in an oven 102 to a temperature above the Ac3 temperature.
  • the oven 102 is a roller-hearth or a batch style oven.
  • the die set 104 having an upper die half 106 and a lower die half 108 .
  • the die set 104 optionally is cooled in order to ensure that a sufficiently rapid cooling rate of the initial blank 100 is achieved, such that martensite is formed.
  • channels are defined through the upper die half 106 and the lower die half 108 for flowing a cooling fluid, such as for instance water, through the die halves to achieve the rapid cooling rate of the product that is being formed from the initial blank 100 .
  • a typical cooling rate is in the range of about 30° C./second to about 100° C./second.
  • the product is held inside the die set during cooling, so as to maintain the desired shape of the product while it is being cooled and hardened.
  • the product shown at 110
  • the product is further cooled to about room temperature, or at least to a temperature between about 20° C. and about 250° C.
  • the product 110 has substantially a uniform martensite structure.
  • a collar box 112 is placed around a portion of the product 110 that is to have high tensile strength in the finished product (i.e., the “hard zone”).
  • the collar box 112 may be one of gas-cooled (e.g., air-cooled) and liquid-cooled (e.g., water-cooled).
  • the collar box 112 merely insulates the portion of the product 110 from the fluid bed heated portion.
  • the product 110 is at least partially immersed in a fluidized bed, shown generally at 114 .
  • the fluidized bed 114 comprises a solid particulate 116 (e.g., sand) that is heated by a fluid 118 (e.g., hot compressed air) flowing through the solid particulate 116 .
  • a fluid 118 e.g., hot compressed air
  • the fluidized bed 114 is set to a desired temperature between about 370° C. and about 800° C., in particular a desired temperature in the range of between about 500° C. and about 750° C. may. Only a first region 120 of the product 110 is immersed in the fluidized bed and heated to approximately the desired temperature.
  • the collar box 112 acts as a barrier and prevents substantial heating of a portion of the product 110 that is adjacent to the first region 120 .
  • the product 110 and the collar box 112 are lowered into the fluidized bed 114 to a point up to the collar box 112 .
  • a small gap is left between the collar box 112 and the fluidized bed 114 , or the collar box 112 is lowered slightly into the fluidized bed 114 .
  • the collar box 112 is omitted and the portion of the product 110 that is to have high tensile strength in the finished product is protected from being heated using a curtain of cooled gas (such as for instance cooled air) or by spraying or misting with a cooling liquid (such as for instance water).
  • a curtain of cooled gas such as for instance cooled air
  • a cooling liquid such as for instance water
  • the product 110 and the collar box 112 are left immersed in the fluidized bed 114 until the first region 120 reaches a desired temperature in the range of between about 370° C. to about 800° C. and may or may not be soaked at that temperature for a period of time.
  • the product 110 and the collar box 112 are then removed from the fluidized bed 114 , and the product 110 is cooled to room temperature.
  • the first region 120 is gas-cooled.
  • a fixture is used to maintain the dimensions of the product 110 during the cooling process.
  • the first region 120 is cooled using another suitable cooling technique, such as for instance one of gas-blasting, fluidized bed cooling, die cooling, water/mist cooling, and cooling with the use of cooling fans/jets, etc.
  • another suitable cooling technique such as for instance one of gas-blasting, fluidized bed cooling, die cooling, water/mist cooling, and cooling with the use of cooling fans/jets, etc.
  • additional not illustrated post processing is performed subsequent to cooling, such as for instance trimming or perforating, etc.
  • the additional not illustrated post processing is performed subsequent to the hot forming and press hardening steps, but prior to the post hot forming treatment in the fluidized bed.
  • Tempered martensite is formed within the first region 120 of the product 110 by the steps of reheating to between about 370° C. and about 800° C. and then cooling.
  • the collar box 112 protects a second region 122 of the product 110 from being reheated to between about 370° C. and about 800° C., such that tempered martensite is not formed within the second region 122 .
  • the original martensite structure that is formed during the hot forming and press hardening operation is retained within the second region 122 in the finished product.
  • a transition zone (not illustrated) of finite width exists along the “boundary” between the first region 120 and the second region 122 .
  • the tensile strength of the product 110 within the transition zone is intermediate the tensile strength within the first region 120 and the tensile strength within the second region 122 .
  • FIG. 2 shown is the product 110 that is obtained at point “A” of the thermoforming line of FIG. 1 .
  • the product 110 at point “A” is substantially uniformly of martensite structure.
  • FIG. 3 shown is the product 110 corresponding to point “B” of the thermoforming line of FIG. 1 .
  • the structure of the product 110 at point “B” is also substantially uniformly of martensite structure, but the product 110 has been mounted in collar box 112 so as to define an unprotected first region 120 and a protected second region 122 .
  • FIG. 4 illustrates that two regions of substantially different tensile strength are obtained at point “C” of the thermoforming line of FIG. 1 , following post hot-forming processing of the product 110 .
  • the protected second region 122 retains the original martensite structure, whereas tempered martensite has been formed within the first region 120 .
  • a transition zone (not illustrated) of finite width exists along the “boundary” between the first region 120 and the second region 122 .
  • the tensile strength of the product 110 within the transition zone is intermediate the tensile strength within the first region 120 and the tensile strength within the second region 122 .
  • FIG. 5 a shown are the locations of a plurality of tensile strength samples taken from a representative B column that was formed using the thermoforming line of FIG. 1 .
  • a sample is taken from the transition zone along the “boundary” between the first region 120 and the second region 122 , one sample is taken on each side of the “boundary” and at a distance of 20 mm from the line, and additional samples are taken proximate each end of the B column, within the first and second regions 120 and 122 , respectively.
  • tensile strength values of the samples that are taken from the first region 120 are approximately uniform and lower than the tensile strength values of the samples that are taken the second region 122 .
  • the sample that is taken from the transition zone between the first and second regions 120 and 122 , respectively, has a tensile strength value that is intermediate the high and low tensile strength values. Accordingly, the product 110 is characterized by a first region 120 of low tensile strength and a second region 122 of high tensile strength, separated by a relatively transition zone of intermediate tensile strength.
  • FIG. 5 c is a plot showing experimentally measured Vickers Hardness values as a function of distance proximate the transition zone between the first region and the second region of the B column of FIG. 5 a .
  • the hardness is substantially uniform within the first region between about 0 mm and about 60 mm, and within the second region between about 80 mm and about 140 mm.
  • the hardness changes rapidly with distance, indicating a narrow and well defined transition zone between the first region and the second region.
  • an initial blank is subjected to a hot forming and press hardening operation to form a shaped product with substantially a uniform first tensile strength.
  • the shaped product subsequently is immersed, at least partially, into a fluidized bed that is maintained within a known range of operating temperatures. While the shaped product is at least partially immersed into the fluidized bed, a first region of the shaped product is heated selectively to above a known temperature, while at the same time a second region of the shaped product that is adjacent to the first region is maintained below the known temperature. The first region is then cooled, such that the first region attains a second tensile strength that is substantially less than the first tensile strength.
  • the initial blank is heated to an austenitizing temperature.
  • the initial blank is hot-shaped in a cooled pair of dies to form the shaped product.
  • the shaped product is cooled during a first period of time, using a rate of cooling that is sufficiently rapid to support formation of a martensitic structure within substantially the entire shaped product.
  • the shaped product is at least partially immersed into a fluidized bed that is maintained within a known range of operating temperatures.
  • a first portion of the shaped product is heated selectively to a known temperature that is less than the austenitizing temperature.
  • a second portion of the shaped product, which is adjacent to the first portion is maintained below the known temperature.
  • the shaped product is cooled such that tempered martensite is formed within the first portion of the shaped product while at the same time the second portion of the shaped product remains substantially free of tempered martensite.
  • the initial blank is provided at 800 .
  • the initial blank is heated to the austenite state.
  • the initial blank is hot-shaped in a cooled pair of dies so as to form the shaped product.
  • the entire shaped product is hardened, while it is still inside the pair of dies, by cooling the product using a rate of cooling that is sufficiently fast to form a martensitic structure.
  • the shaped and hardened product is transferred from the pair of dies to a fluidized bed that is maintained within a known range of operating temperatures.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Articles (AREA)
US13/811,980 2010-06-24 2011-06-23 Tailored Properties By Post Hot Forming Processing Abandoned US20130136945A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US13/811,980 US20130136945A1 (en) 2010-06-24 2011-06-23 Tailored Properties By Post Hot Forming Processing

Applications Claiming Priority (8)

Application Number Priority Date Filing Date Title
US35817410P 2010-06-24 2010-06-24
US61358174 2010-06-24
US37980110P 2010-09-03 2010-09-03
US61379801 2010-09-03
US38609510P 2010-09-24 2010-09-24
US61386095 2010-09-24
US13/811,980 US20130136945A1 (en) 2010-06-24 2011-06-23 Tailored Properties By Post Hot Forming Processing
PCT/CA2011/000732 WO2011160209A1 (fr) 2010-06-24 2011-06-23 Propriétés personnalisées par post-traitement de formage à chaud

Publications (1)

Publication Number Publication Date
US20130136945A1 true US20130136945A1 (en) 2013-05-30

Family

ID=45370783

Family Applications (1)

Application Number Title Priority Date Filing Date
US13/811,980 Abandoned US20130136945A1 (en) 2010-06-24 2011-06-23 Tailored Properties By Post Hot Forming Processing

Country Status (9)

Country Link
US (1) US20130136945A1 (fr)
EP (1) EP2585621B1 (fr)
KR (1) KR20130028136A (fr)
CN (1) CN103339268B (fr)
AU (1) AU2011269680B2 (fr)
CA (1) CA2804707C (fr)
MX (1) MX2013000222A (fr)
RU (1) RU2013102917A (fr)
WO (1) WO2011160209A1 (fr)

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130180635A1 (en) * 2010-09-30 2013-07-18 Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.) Press-formed product and method for producing same
US20140338802A1 (en) * 2011-09-30 2014-11-20 Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.) Press-forming product manufacturing method and press-forming facility
US20140352388A1 (en) * 2011-09-27 2014-12-04 Imperial Innovations Limited Method of forming parts from sheet steel
WO2016046637A1 (fr) * 2014-09-22 2016-03-31 Magna International Inc. Procédé de production d'élément structural comprenant un procédé de trempe thermomagnétique produisant des zones molles localisées
US20180135147A1 (en) * 2016-11-14 2018-05-17 Toyota Jidosha Kabushiki Kaisha Hot-press molding method and hot-press molded product
US10260118B2 (en) 2013-12-10 2019-04-16 Muhr Und Bender Kg Post-treating a hardened metal formed part
US20190217902A1 (en) * 2015-12-09 2019-07-18 Arcelormittal Vehicle underbody structure comprising a reinforcement element between a longitudinal beam and a lowerside sill part
US10399519B2 (en) 2017-06-16 2019-09-03 Ford Global Technologies, Llc Vehicle bumper beam with varied strength zones
US10486215B2 (en) 2017-06-16 2019-11-26 Ford Motor Company Apparatus and method for piercing and trimming hot stamped parts
US10556624B2 (en) 2017-06-16 2020-02-11 Ford Global Technologies, Llc Vehicle underbody component protection assembly
US10633037B2 (en) 2017-06-16 2020-04-28 Ford Global Technologies, Llc Vehicle underbody assembly with thermally treated rear rail
US10961603B2 (en) 2013-11-25 2021-03-30 Magna International Inc. Structural component including a tempered transition zone
US11027325B2 (en) * 2016-12-22 2021-06-08 Benteler Automobiltechnik Gmbh Hot-formed metal sheet and method of producing an opening in such a metal sheet
US11141769B2 (en) 2017-06-16 2021-10-12 Ford Global Technologies, Llc Method and apparatus for forming varied strength zones of a vehicle component
WO2024062035A1 (fr) * 2022-09-22 2024-03-28 Autotech Engineering S.L. Composants structuraux pour un véhicule et procédés

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2015126258A (ru) * 2013-02-06 2017-03-09 Магна Интернэшнл Инк. Горячештамповочный узел в сборе и способ изготовления термообработанной детали
DK177974B1 (da) * 2013-09-09 2015-02-09 Broen As Anlæg og fremgangsmåde til afspændingsudglødning af et emne omfattende varmefølsomme dele, samt afspændingsudglødet emne
US20190106764A1 (en) * 2017-10-11 2019-04-11 Toyota Jidosha Kabushiki Kaisha Steel plate member and method of producing the steel plate member
CN110773630B (zh) * 2019-11-05 2022-02-11 山东钢铁集团日照有限公司 一种解决不规则坯料导电加热温度不均匀的方法
CN114326187B (zh) * 2020-09-29 2024-04-23 北京小米移动软件有限公司 金属背板及其制造方法、背光模组和电子设备

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110315281A1 (en) * 2010-06-24 2011-12-29 Magna International Inc. Tailored Properties By Post Hot Forming Processing

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6016294A (ja) * 1983-07-07 1985-01-28 東レエンジニアリング株式会社 流動層炉による金属ワ−クの部分加熱方法
FR2649415B1 (fr) * 1989-07-07 1991-10-31 Gautier Jacques Procede de fabrication de pieces a hautes caracteristiques mecaniques a partir d'acier non traite
SE9602257L (sv) 1996-06-07 1997-12-08 Plannja Hardtech Ab Sätt att framställa ståldetalj
DE19743802C2 (de) * 1996-10-07 2000-09-14 Benteler Werke Ag Verfahren zur Herstellung eines metallischen Formbauteils
JP4699605B2 (ja) * 2000-12-27 2011-06-15 旭テック株式会社 複層熱処理炉、熱処理装置、及び熱処理方法
WO2008042982A2 (fr) * 2006-10-03 2008-04-10 Cola Jr Gary M Microtraitement d'alliage à base de fer, appareil et procédé associés, et articles résultant d'un tel traitement
DE102008044523B4 (de) 2008-09-15 2011-06-16 Thyssenkrupp Steel Europe Ag Warmumformprofile
DE102010027179B3 (de) * 2010-07-14 2011-11-10 Benteler Automobiltechnik Gmbh Verfahren und Fertigungsanlage zur Herstellung von Kraftfahrzeugbauteilen

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110315281A1 (en) * 2010-06-24 2011-12-29 Magna International Inc. Tailored Properties By Post Hot Forming Processing

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
NPL-1: "Tempering of Steel" by Wisti et al. from Vol. 4 of the ASM Handbook, thereafter NPL-1, 1991 *

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130180635A1 (en) * 2010-09-30 2013-07-18 Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.) Press-formed product and method for producing same
US9315876B2 (en) * 2010-09-30 2016-04-19 Kobe Steel, Ltd. Press-formed product and method for producing same
US20140352388A1 (en) * 2011-09-27 2014-12-04 Imperial Innovations Limited Method of forming parts from sheet steel
US9469891B2 (en) * 2011-09-30 2016-10-18 Kobe Steel, Ltd. Press-forming product manufacturing method and press-forming facility
US20140338802A1 (en) * 2011-09-30 2014-11-20 Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.) Press-forming product manufacturing method and press-forming facility
US10961603B2 (en) 2013-11-25 2021-03-30 Magna International Inc. Structural component including a tempered transition zone
US10260118B2 (en) 2013-12-10 2019-04-16 Muhr Und Bender Kg Post-treating a hardened metal formed part
WO2016046637A1 (fr) * 2014-09-22 2016-03-31 Magna International Inc. Procédé de production d'élément structural comprenant un procédé de trempe thermomagnétique produisant des zones molles localisées
CN114262769A (zh) * 2014-09-22 2022-04-01 麦格纳国际公司 包括产生局部软区的热磁回火工艺的用于制造结构部件的方法
US20170298462A1 (en) * 2014-09-22 2017-10-19 Magna International Inc. Method For Producing A Structural Component Including A Thermomagnetic Tempering Process Yielding Localized Soft Zones
US20190217902A1 (en) * 2015-12-09 2019-07-18 Arcelormittal Vehicle underbody structure comprising a reinforcement element between a longitudinal beam and a lowerside sill part
US10676138B2 (en) * 2015-12-09 2020-06-09 Arcelormittal Vehicle underbody structure comprising a reinforcement element between a longitudinal beam and a lowerside sill part
US11118242B2 (en) * 2016-11-14 2021-09-14 Toyota Jidosha Kabushiki Kaisha Hot-press molding method and hot-press molded product
US20180135147A1 (en) * 2016-11-14 2018-05-17 Toyota Jidosha Kabushiki Kaisha Hot-press molding method and hot-press molded product
US11027325B2 (en) * 2016-12-22 2021-06-08 Benteler Automobiltechnik Gmbh Hot-formed metal sheet and method of producing an opening in such a metal sheet
US10486215B2 (en) 2017-06-16 2019-11-26 Ford Motor Company Apparatus and method for piercing and trimming hot stamped parts
US10556624B2 (en) 2017-06-16 2020-02-11 Ford Global Technologies, Llc Vehicle underbody component protection assembly
US10633037B2 (en) 2017-06-16 2020-04-28 Ford Global Technologies, Llc Vehicle underbody assembly with thermally treated rear rail
US10399519B2 (en) 2017-06-16 2019-09-03 Ford Global Technologies, Llc Vehicle bumper beam with varied strength zones
US11141769B2 (en) 2017-06-16 2021-10-12 Ford Global Technologies, Llc Method and apparatus for forming varied strength zones of a vehicle component
WO2024062035A1 (fr) * 2022-09-22 2024-03-28 Autotech Engineering S.L. Composants structuraux pour un véhicule et procédés

Also Published As

Publication number Publication date
EP2585621A4 (fr) 2018-05-09
KR20130028136A (ko) 2013-03-18
CN103339268A (zh) 2013-10-02
MX2013000222A (es) 2013-02-27
CA2804707A1 (fr) 2011-12-29
AU2011269680B2 (en) 2015-04-02
CA2804707C (fr) 2016-05-10
AU2011269680A1 (en) 2013-01-31
EP2585621B1 (fr) 2021-01-27
RU2013102917A (ru) 2014-07-27
CN103339268B (zh) 2015-09-16
EP2585621A1 (fr) 2013-05-01
WO2011160209A1 (fr) 2011-12-29

Similar Documents

Publication Publication Date Title
CA2804707C (fr) Proprietes personnalisees par post-traitement de formage a chaud
CN113249556B (zh) 具有至少两个强度不同的区域的汽车组件的制备方法
US20110315281A1 (en) Tailored Properties By Post Hot Forming Processing
US8733144B2 (en) Method and apparatus for hot forming and hardening a blank
KR101567132B1 (ko) 철-망간 강 시트로부터의 구조재용 부품의 제조 방법
US8691032B2 (en) Microstructural optimization of automotive structures
US8272681B2 (en) Process for producing a locally hardened profile component, locally hardened profile component and use of a locally hardened profile component
EP2737093B1 (fr) Produit et procédé impliquant un traitement thermique localisé d'une tôle d'acier
US20040060623A1 (en) Method of fabricating metal parts of different ductilities
US20190119768A1 (en) Hot forming tool with infrared light source
KR102006963B1 (ko) 강 반제품의 열간성형에 의해 부품을 생산하기 위한 방법
Ganapathy et al. A feasibility study on warm forming of an as-quenched 22MnB5 boron steel
US9238847B2 (en) Tailored hardening of boron steel
Kim et al. Partial strengthening method for cold stamped B-pillar with minimal shape change
US10266905B2 (en) Method and apparatus for hardening a component or semi-finished product
CN116065004A (zh) 用于改进压制硬化钢的韧性的方法
Billur et al. Advancements in tailored hot stamping simulations: cooling channel and distortion analyses
EP3245307A1 (fr) Procédé et système de traitement thermique sélectif d'une feuille métallique
US11873537B2 (en) Method for producing a profiled component, and profiled component
CA3032551C (fr) Procede et dispositif de moulage et de durcissement de materiaux d'acier
CN114643309A (zh) 一种变强度热成形钢零件的加工方法

Legal Events

Date Code Title Description
AS Assignment

Owner name: MAGNA INTERNATIONAL INC., CANADA

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:CHAREST, PASCAL P.;ADAM, NICHOLAS D.;SIGNING DATES FROM 20130118 TO 20130205;REEL/FRAME:029817/0578

STCB Information on status: application discontinuation

Free format text: ABANDONED -- AFTER EXAMINER'S ANSWER OR BOARD OF APPEALS DECISION