The effect of microstructure on absorbed energy at high strain rate has been investigated to develop 590 MPa TS grade hot-rolled dual-phase sheet steels with excellent crashworthiness and formability. Increase of ferrite-martensite perimeter led to higher absorbed energy of up to 30% strain and higher n-value at 10% strain during 2000/s strain rate deformation. This is attributed to the dispersion of fine martensite, which enhances internal stress during high strain rate deformation. On the basis of the above described result, a hot rolled dual phase steel of from 1.4 to 2.0 mm in thickness with low yield ratio, high elongation, excellent crashworthiness and formability can be developed with a new precisely cooling process after finishing rolling.


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    Title :

    TS590 MPa grade hot rolled thin gauge sheet steels with excellent crashworthiness and formability


    Additional title:

    Dünnes Warmband der Festigkeitsklase 590 MPa mit ausgezeichneter Umformbarkeit und Crashverhalten
    Titel japanisch


    Contributors:
    Shimizu, T. (author) / Kanamoto, N. (author) / Fukui, Y. (author)

    Published in:

    Kawasaki Steel Giho ; 31 , 3 ; 176-180


    Publication date :

    1999


    Size :

    5 Seiten, 10 Bilder, 3 Tabellen, 8 Quellen



    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    Japanese




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