The automobile is required to reduce weight for lower fuel consumption on one hand and to add reinforcements strategically around the structure for higher safety on the other. However, the door reinforcment parts, for example, which have to absorb impact energy, call for conflicting characteristics: higher strength especially in the area of plastic deformation and better formability to achieve effective sectional characteristics. With conventional high-strength steel sheets, the weight reduction in components has been limited to a significant extent because of the difficulties in press forming. Recently 780MPa grade high-strength steel sheets containing retained austenite have been developed with higher strength and better formability. The steel sheets thus developed consist of retained austenite, bainite, and ferrite matrix. These steel sheets have been practically applied to side door beams for the doors of a production model, with results which are satisfactory from the view points of performance in side impact crashes and weight reduction as well. In this paper, the technical highlights of the newly developed steel sheets are described with verified experimental data which cover such items as strength-ductility balance, fatigue strength, weldability and so forth.
Application of high strength steel sheets containing retained austenite to body parts
Verwendung von hochfestem Stahlblech mit Restaustenit für Fahrzeugkarosserieteile
1994
9 Seiten, 13 Bilder, 3 Tabellen, 11 Quellen
Aufsatz (Konferenz)
Englisch
Restaustenit , hochfester Stahl , Automobilbau , Gewichtsminimierung , Karosserie , Fahrzeugtür , Stahlblech , Bearbeitbarkeit , Schweißbarkeit , plastische Verformung , Bainit , Seitenkraft , Ferrit (Alpha-Mischkristall) , Aufprallversuch , Aufprall , Zusammenstoß , Fahrzeugsicherheit , Werkstoffbeschreibung , Dehnbarkeit , Fahrzeugbauteil , Blech , Ferrit , Dehngrenze
Application of high strength steel sheets containing retained austenite to body parts
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