The invention relates to hot-dip galvanized DH steel and a preparation method thereof and an automobile structural member, and belongs to the technical field of steel preparation, and the hot-dip galvanized DH steel comprises a steel base body and a zinc coating attached to at least part of the surface of the steel base body; the microscopic structure of the steel matrix comprises ferrite, martensite, bainite and retained austenite; the martensite comprises fresh martensite and tempered martensite; in the microstructure of the steel matrix, the volume fraction of the fresh martensite is less than 10%. According to the hot-dip galvanized DH steel, by controlling the content of fresh martensite and tempered martensite in the microstructure of a steel matrix of the hot-dip galvanized DH steel, most of the fresh martensite in the microstructure of the steel matrix is converted into the tempered martensite, and the volume fraction of the fresh martensite is smaller than 10%, so that the hardness difference between ferrite and the martensite is reduced, and the hot-dip galvanized DH steel is obtained. And the purpose of improving the local forming performance of the hot-dip galvanized DH steel is achieved.

    本公开涉及一种热镀锌DH钢及其制备方法和汽车结构件,属于钢材制备技术领域,所述热镀锌DH钢包括钢基体以及附着于所述钢基体至少部分表面的镀锌层;所述钢基体的显微组织包括:铁素体、马氏体、贝氏体及残余奥氏体;所述马氏体包括:新鲜马氏体和回火马氏体;在所述钢基体的显微组织中,所述新鲜马氏体的体积分数<10%。该热镀锌DH钢通过控制热镀锌DH钢的钢基体显微组织中新鲜马氏体和回火马氏体含量,将钢基体的显微组织中的大部分新鲜马氏体转变为回火马氏体,使新鲜马氏体的体积分数<10%,从而降低铁素体和马氏体间的硬度差,达到改善热镀锌DH钢局部成形性能的目的。


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    Title :

    Hot-dip galvanized DH steel, preparation method thereof and automobile structural member


    Additional title:

    一种热镀锌DH钢及其制备方法和汽车结构件


    Contributors:
    ZHU GUOSEN (author) / YANG FENG (author) / LIU HUASAI (author) / HAN YUN (author) / TENG HUAXIANG (author) / CHEN BIN (author) / LI FEI (author) / QIU MUSHENG (author) / ZOU YING (author) / HAN LONGSHUAI (author)

    Publication date :

    2023-07-07


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Chinese


    Classification :

    IPC:    C22C Legierungen , ALLOYS / B60R Fahrzeuge, Fahrzeugausstattung oder Fahrzeugteile, soweit nicht anderweitig vorgesehen , VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR / B62D MOTOR VEHICLES , Motorfahrzeuge / C21D Veränderung der physikalischen Struktur von Eisenmetallen , MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS / C23C Beschichten metallischer Werkstoffe , COATING METALLIC MATERIAL



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