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  • Processing of new dual-phase (DP) and complex-phase (CP) steels for automotive applications by tailored hot forming routes

    11 May 2019

    Radhakanta Rana, Chris Lahaije; Tata Steel R&D, IJmuiden
    Iñaki Pérez, Maribel Arribas, Iñigo Aranguren, Ángela Mangas; Tecnalia, Derio
    Daniele De Caro; CRF-FCA, Torino

    Advanced high strength steels (AHSS) are being used in the automotive sector with the aim of supporting the current demands of reducing vehicle weight and structures, but cold forming of such steel grades shows some challenges like springback, high press forces or low stretch-flangeability. To overcome these drawbacks, different ferritic-martensitic dual phase (DP) alloys and martensitic-bainitic complex phase (CP) alloys with retained austenite were designed and novel hot forming routes were applied for processing them. The thermal cycle for the DP alloys included an intercritical reheating whereas in-situ austempering or slow continuous cooling preceded by supercritical reheating was used for the CP alloys. The objective of obtaining similar, or even better, post-formed mechanical properties than the current cold-formable DP1000-Low Yield and CP1000 grades in terms of yield strength (YS), ultimate tensile strength (UTS) and total elongation (TE), combining the new alloys and the proposed hot forming routes was investigated through an intensive testing campaign.

    Paper presented at the 22nd International Conference on Material Forming (ESAFORM 2019), Vitoria-Gasteiz, Basque Country, Spain, 8th-10th May 2019, organised by Mondragon Unibertsittea

    DOI not available