With social demand of automobiles that provide higher fuel efficiency, safety in collisions, the steel makers are tackling the needs of the auto industry by developing higher performance materials such as AHSS (advanced high strength steels). From this point of view, DP and FB (ferrite-bainite) steels have received considerable attention because of their good strength and formability relationship. The results of application with the AHSS on chassis parts were compared with the conventional steels of 370 or 440MPa grade steels. 590DP steel has good press formability due to higher n-value and lower yield strength. Fatigue durability of chassis assembly was increased due to the strength and bake hardening effects in spite of thickness reduction. The damping capacity of chassis components increased more than 2 times comparing with conventional steels. With 540 and 590FB steels which have excellent stretch flangeability, the validity were proved by successful press forming and weight reduction of arms as well as increased fatigue durability. It was tried out to realize the application of 590DP, 540FB and 590FB steels of AHSS series in order to reduce the weight of automotive chassis parts such as subframe, tubular beam and lower arm. By the feasibility study and press forming test, it was proved that the weight reduction from 6 to 19%, and better fatigue durability and buckling forces could be achieved as compared with conventional 370SS steels.
Application of advanced high strength hot-rolled steels to automotive chassis parts
Anwendung von modernen hochfesten Warmbandgüten für das Fahrgestell im Automobilbau
2005
8 Seiten, 13 Bilder, 3 Tabellen, 2 Quellen
Conference paper
English
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