Development of Ultrahigh-Strength Complex Phase Steel With Enhanced Ductility

Résumé fourni par la source

In recent years, ultra high strength steels are used more and more in automotive industry in order to reduce the weight of body in white, such as dual phase steel (DP), complex phase steel (CP), and dual phase steel with improved formability steel (DH)[1–3]. In these kinds of steels, DP steel and DH steel have higher tensile strength and good formability in most cases. But for some components, bending and flanging are needed during cold forming process. However DP and DH steels have a poor stretch flangabiliy, which will not meet the requirements of the OEMs. For CP steel, due to its complex microstructure with bainite, martensite and ferrite, it has a higher stretch flangabiliy but with poor formability compared with DP and DH steels.

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