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    HIGH PERFORMANCE PRESS-HARDENED STEEL
    21.
    发明申请
    HIGH PERFORMANCE PRESS-HARDENED STEEL 有权

    公开(公告)号：US20210189531A1

    公开(公告)日：2021-06-24

    申请号：US17128588

    申请日：2020-12-21

    Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

    Inventor： Qi LU ,  Jianfeng WANG

    IPC: C22C38/18 ,  B21D22/02 ,  C21D1/18 ,  C22C38/02 ,  C22C38/04

    Abstract: A press-hardened steel component after hot forming including an alloy composition including carbon at a concentration of greater than or about 0.01 wt. % to less than or about 0.2 wt. %, chromium at a concentration of greater than or about 0.5 wt. % to less than or about 6 wt. %, manganese at a concentration of greater than or about 0.5 wt. % to less than or about 4.5 wt. %, silicon at a concentration of greater than or about 0.5 wt. % to less than or about 2.5 wt. %, and a balance of the alloy composition being iron, wherein the press-hardened steel component includes greater than or 90 volume % martensite and bainite, has an ultimate tensile strength of greater than or about 800 megapascals to less than or about 1,200 megapascals and a VDA 238-100 bending angle of greater than or about 60° to less than or about 80°.

    HIGH PERFORMANCE PRESS-HARDENED STEEL ASSEMBLY
    22.
    发明申请
    HIGH PERFORMANCE PRESS-HARDENED STEEL ASSEMBLY 有权

    公开(公告)号：US20210187906A1

    公开(公告)日：2021-06-24

    申请号：US17128631

    申请日：2020-12-21

    Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

    Inventor： Qi LU ,  Jianfeng WANG

    IPC: B32B15/01 ,  C21D9/46 ,  C21D6/00 ,  B23K20/04 ,  B21D22/02

    Abstract: A press-hardened steel assembly after hot stamping/hot forming including a core layer having a tensile strength of ≥about 1,800 megapascals to ≤about 2,200 megapascals and ≥about 90 volume % martensite, the core layer having a first thickness ≥about 40% to ≤about 96% of the thickness of the press-hardened steel assembly; and a first surface layer along a first surface of the core, the first surface layer having a tensile strength of ≥about 800 megapascals to ≤about 1,200 megapascals and ≥about 90 volume % martensite and bainite. The press-hardened steel assembly has a tensile strength of ≥about 1,600 megapascals to ≤about 2,000 megapascals and a VDA 238-100 bending angle of ≥about 50° to ≤about 80°.

    PRESS HARDENED STEEL WITH SURFACE LAYERED HOMOGENOUS OXIDE AFTER HOT FORMING
    23.
    发明申请
    PRESS HARDENED STEEL WITH SURFACE LAYERED HOMOGENOUS OXIDE AFTER HOT FORMING 有权

    公开(公告)号：US20210002746A1

    公开(公告)日：2021-01-07

    申请号：US16460369

    申请日：2019-07-02

    Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

    Inventor： Qi LU ,  Jianfeng WANG

    IPC: C22C38/02 ,  C22C38/04 ,  C22C38/22 ,  C22C38/24 ,  C22C38/26 ,  C22C38/32 ,  C21D1/18

    Abstract: A press-hardened steel is provided. The press-hardened steel has an alloy matrix including from about 0.01 wt. % to about 0.35 wt. % carbon, from about 1 wt. % to about 9 wt. % chromium, from about 0.5 wt. % to about 2 wt. % silicon, and a balance of iron. The alloy matrix is greater than or equal to about 95 vol. % martensite. A first layer is disposed directly on the alloy matrix. The first layer is continuous, has a thickness of greater than or equal to about 0.01 μm to less than or equal to about 10 μm, and includes an oxide enriched with chromium and silicon. A second layer is disposed directly on the first layer, and includes an oxide enriched with Fe. Methods of preparing the press-hardened steel are also provided.

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