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    • 76. 发明授权
    • High strength press-formed member and method for manufacturing the same
    • 高强度压制构件及其制造方法
    • US08992697B2
    • 2015-03-31
    • US13583407
    • 2011-02-28
    • Hiroshi MatsudaYoshimasa FunakawaYasushi Tanaka
    • Hiroshi MatsudaYoshimasa FunakawaYasushi Tanaka
    • C22C38/02C22C38/04C22C38/06C22C38/08C22C38/12C22C38/16C22C38/38C21D8/06C21D8/02C21D1/22C21D9/46C22C38/00
    • C21D8/0247C21D1/22C21D8/0205C21D9/46C21D2211/001C21D2211/002C21D2211/008C22C38/001C22C38/02C22C38/04C22C38/06
    • A high strength press-formed member includes a steel sheet constituting the member including a composition including by mass %, C: 0.12% to 0.69%, Si: 3.0% or less, Mn: 0.5% to 3.0%, P: 0.1% or less, S: 0.07% or less, Al: 3.0% or less, N: 0.010% or less, Si+Al: at least 0.7%, and remainder as Fe and incidental impurities, wherein a microstructure of the steel sheet includes martensite, retained martensite, and bainite containing bainitic ferrite, an area ratio of said martensite with respect to the entire microstructure of the steel sheet is 10% to 85%, at least 25% of said martensite is tempered martensite, content of retained austenite is 5% to 40%, area ratio of said bainitic ferrite in said bainite with respect to the entire microstructure of the steel sheet is at least 5%, total of area ratios of said martensite, said retained austenite, and said bainitic ferrite in said bainite with respect to the entire microstructure of the steel sheet is at least 65%, and average carbon concentration in the retained austenite is at least 0.65 mass %.
    • 高强度压力成形构件包括构成该构件的钢板,该钢板包括质量%C:0.12%〜0.69%,Si:3.0%以下,Mn:0.5〜3.0%,P:0.1% S:0.07%以下,Al:3.0%以下,N:0.010%以下,Si + Al:0.7%以上,剩余部分作为Fe和附带杂质,其中,钢板的显微组织包括马氏体, 所含马氏体的贝氏体含有贝氏体铁素体,所述马氏体相对于钢板整体的面积比为10%〜85%,所述马氏体的回弹马氏体的至少25%为回火马氏体,残留奥氏体含量为5% 至所述贝氏体中所述贝氏体铁素体相对于钢板整体的面积比至少为40%,所述贝氏体中的所述马氏体,所述残留奥氏体和所述贝氏体铁素体的面积率为所述贝氏体的面积率的至少5% 钢板的整个微观结构至少为65%,平均碳浓度为 残留奥氏体中的残留率为0.65质量%以上。