Provided is a vehicle collision energy absorbing member excellent in collision energy absorbing performance in the axial direction upon collision. The vehicle collision energy absorbing member is formed of a high strength thin steel sheet having TS of at least 980 MPa and having an n-value and a limit bending radius Rc satisfying the following Formula: Rc / t ¤ 1.31 x ln(n) + 5.21. The use of the aforementioned high strength thin steel sheet allows the member to be stably buckled in the axial direction and crush-deformed into a bellows shape upon vehicle collision even if TS is 980 MPa or above. The high strength steel sheet used herein preferably includes a chemical composition containing, by mass%: C: 0.14 % to 0.30 %; Si: 0.01 % to 1.6 %; Mn: 3.5 % to 10 %; N: 0.0060 % or less; and Nb: 0.01 % to 0.10 %, and has a microstructure including a ferrite phase by 30 % to 70 % in volume fraction with respect to the entire microstructure and a secondary phase other than the ferrite phase, the ferrite phase having an average grain size of 1.0 µm or smaller, the secondary phase at least containing a retained austenite phase by at least 10 % in volume fraction to the entire microstructure, the retained austenite phase having an average spacing of 1.5 µm or less.
VEHICLE COLLISION ENERGY ABSORBING MEMBER HAVING HIGH COLLISION ENERGY ABSORBING POWER, AND METHOD FOR MANUFACTURING SAME
ELEMENT ZUR ABSORPTION DER ENERGIE EINES FAHRZEUGZUSAMMENSTOSSES MIT HOHER KOLLISIONSENERGIE-ABSORPTIONSKRAFT SOWIE HERSTELLUNGSVERFAHREN DAFÜR
ÉLÉMENT D'ABSORPTION D'ÉNERGIE DE COLLISION D'UN VÉHICULE PRÉSENTANT UN FORT POUVOIR D'ABSORPTION D'ÉNERGIE DE COLLISION, ET SON PROCÉDÉ DE FABRICATION
2017-09-27
Patent
Elektronische Ressource
Englisch
IPC: | C22C Legierungen , ALLOYS / B21D WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL , Bearbeiten oder Verarbeiten von Blechen, Metallrohren, -stangen oder -profilen ohne wesentliches Abtragen des Werkstoffs / B62D MOTOR VEHICLES , Motorfahrzeuge / C21D Veränderung der physikalischen Struktur von Eisenmetallen , MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS |
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