A high stretch-flange formability is required of the suspension parts and road wheels. So, the factors effecting stretch-flange formability of hot rolled high strength steel sheet were investigated. The stretch-flange formability was evaluated with a punched hole expansion ratio (λ = d/d0).The inclusion (MnS etc.) deteriorates λ. The hole expansion property is affected by a microstructure. Bainite is most desirable. Incidentally, the form of the cementite in bainite has effect on it. Increase of Si accelerates a fine dispersion of cementite and improves the hole expansion property.The microstructure has the effect on the shape of burr on the punched face, a micro-crack condition or a crack propagation property and as the result, it affects the hole expansion property.


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    Titel :

    Stretch-Flange Formability of High-Strength Steel


    Weitere Titelangaben:

    Sae Technical Papers


    Beteiligte:
    Itami, Atsushi (Autor:in) / Koyama, Kazuo (Autor:in) / Matsuzu, Nobuhiko (Autor:in)

    Kongress:

    International Congress & Exposition ; 1991



    Erscheinungsdatum :

    01.02.1991




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




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