The automotive industry is required to optimize safety and lightweight construction for the production of cars and trucks. As a result steel delivers are responsible to make it possible while making available various steel grades. Different projects have shown optimistic outlooks for optimization safety and reduce weight of automobile bodies with using different high strength and ultra high strength steels. In the last group the dual phase steels play the lead. In recent years different steel grades have been developed and optimized for these applications. On the one hand developing the values for mechanical behaviour, joining and forming of dual phase steels is one of the first steps. On the other hand different coated surfaces for different applications of dual phase steels are a simultaneous step. Starting with characteristic production conditions for cold rolled hot dip galvanised dual phase steels the mechanical properties for joining and forming are deduced and selected applications illustrated. During manufacturing the DP steels show higher initial work hardening, higher ultimate tensile strength and lower ratio of yield strength to tensile strength in comparison to HSLA steels. Even the amount of angular change as one mode of springback is lower. Innovative surface treatments as my-Phos simplify the forming processes. During joining of DP steels combined techniques like adhesive bonding with clinching or spot welding result in higher strength and much better behaviour under fatigue load than using the single techniques alone.
Hot dip galvanised dual phase steels for automotive applications
Feuerverzinkte Dualphasenstähle für Anwendungen im Fahrzeugbau
2005
8 Seiten, 11 Bilder
Conference paper
English
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