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    Method and device for the heat treatment of a metal component
    6.
    发明授权
    Method and device for the heat treatment of a metal component 有权

    公开(公告)号：US11078553B2

    公开(公告)日：2021-08-03

    申请号：US16072418

    申请日：2017-01-25

    Applicant: SCHWARTZ GMBH

    Inventor： Andreas Reinartz ,  Jörg Winkel ,  Frank Wilden

    IPC: C21D9/00 ,  C21D8/02 ,  C21D1/19 ,  C21D1/673 ,  C21D6/00 ,  C21D1/667

    Abstract: Disclosed are implementations for heat treatment of a metal component, and a use of a furnace for heating a metal component. The implementations can be used in the partial hardening of optionally pre-coated components made of a high-strength manganese-boron steel. An example method for heat treatment of a metal component comprises at least the following steps: a) heating the component in a first furnace; b) moving the component into a temperature control station; c) cooling at least one first sub-region of the component in the temperature control station, wherein a temperature difference is set between the at least one first sub-region and at least one second sub-region of the component; d) moving the component from the temperature control station into a second furnace; and e) heating at least the at least one first sub-region of the component in the second furnace by at least 200 K.

    METHOD FOR MANUFACTURING A HOT-FORMED ARTICLE, AND OBTAINED ARTICLE
    8.
    发明申请
    METHOD FOR MANUFACTURING A HOT-FORMED ARTICLE, AND OBTAINED ARTICLE 有权

    公开(公告)号：US20210115527A1

    公开(公告)日：2021-04-22

    申请号：US16463420

    申请日：2017-11-24

    Applicant: TATA STEEL IJMUIDEN B.V.

    Inventor： Shangping CHEN ,  Christiaan Theodorus LAHAYE ,  Radhakanta RANA ,  Guido Cornelis HENSEN

    IPC: C21D1/19 ,  C21D9/00 ,  C23C2/06 ,  C22C38/38 ,  C22C38/34 ,  C22C38/32 ,  C22C38/28 ,  C22C38/26 ,  C22C38/24 ,  C22C38/06 ,  C22C38/22

    Abstract: A method for hot-forming a steel blank into an article including the steps of: a. heating a steel blank to a temperature T1 and holding the heated blank at T1 during a time period t1, wherein T1 is in the range of Ac1 to Ac3+200° C. and wherein t1 is at most 12 minutes, b. transferring the heated blank to a hot-forming tool during a transport time t2 during which the temperature of the heated blank decreases from temperature T1 to a temperature T2, wherein T2 is above Ar1 and wherein the transport time t2 is at most 12 seconds, c. forming the blank in the hot-forming tool into an article and quenching it in the hot-forming tool from a temperature T2 to a temperature T3 at a cooling velocity V2 of 25° C./s or more, d. isothermal holding the article at a temperature T4 for a time period t4, e. wherein temperature T3 and/or temperature T4 is between Ms and Mf and wherein t4 is more than 10 seconds and less than 10 minutes, f. cooling the article from temperature T4 to room temperature at a cooling velocity V4. The invention also relates to a hot-formed article obtained by the method.

    Very high strength martensitic steel or part and method of fabrication
    9.
    发明授权
    Very high strength martensitic steel or part and method of fabrication 有权

    公开(公告)号：US10895003B2

    公开(公告)日：2021-01-19

    申请号：US16276242

    申请日：2019-02-14

    Applicant: ArcelorMittal

    Inventor： Kangying Zhu ,  Olivier Bouaziz

    IPC: C22C38/38 ,  C22C38/04 ,  C22C38/18 ,  C22C38/22 ,  C22C38/02 ,  C22C38/06 ,  C22C38/34 ,  C21D1/19 ,  C21D7/13 ,  C21D8/02 ,  C21D9/46 ,  C21D1/673

    Abstract: The present invention provides a method for the fabrication of a steel sheet with a completely martensitic structure which has an average lath size of less than 1 micrometer and an average elongation factor of the laths is between 2 and 5. The elongation factor of a lath is defined as a maximum dimension lmax divided by and a minimum dimension lmin. The steel sheet has a yield stress greater than 1300 MPa and a mechanical strength greater than (3220(C)+958) megapascals. A composition of a semi-finished steel product includes, expressed in percent by weight, is, 0.15%≤C≤0.40%, 1.5%≤Mn≤3%, 0.005%≤Si≤2%, 0.005%≤Al≤0.1%, 1.8%≤Cr≤4%, 0%≤Mo≤2%, whereby: 2.7% 0.5 (Mn)+(Cr)+3(Mo)≤5.7%, S≤0.05%, P≤0.1%, optionally: 0%≤Nb≤0.050%, 0.01%≤Ti≤0.1%, 0.0005%≤B≤0.005%, 0.0005%≤Ca≤0.005%. The semi-finished product is reheated to a temperature T1 in the range between 1050° C. and 1250° C., then subjected to a roughing rolling at a temperature T2 in the range between 1000 and 880° C., with a cumulative rate of reduction εa greater than 30%, to obtain a sheet with a completely recrystallized austenitic structure with an average grain size less than 40 micrometers and preferably less than 5 micrometers. The sheet is then partially cooled to prevent a transformation of the austenite at a rate VR1 greater than 2° C./s to a temperature T3 between 600° C. and 400° C. in the metastable austenitic range, and subjected to a finishing hot rolling at the temperature T3 of the partially cooled sheet, with a cumulative rate of reduction εb greater than 30% to obtain a sheet that is then cooled at a rate VR2 which is greater than the critical martensitic quenching rate.

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