With the continuing emphasis on mass reduction in passenger cars, increasing attention has been paid to developing light weight suspension components. One area of concentration has been the development of spring steels capable of sustaining higher operating stresses, thereby permitting the use of smaller wire diameters to reduce coil spring mass. A microallyoed spring steel has been developed which exhibits, at a tensile strength of 2000 MPa, fracture tougness equal to conventional spring steels utilized at a tensile strength of 1725 MPa. Laboratory testing, as well as component fatigue testing on low mass springs, shows that excellent fatigue lives as well as sag resistance can be obtained at operating stresses higher than currently employed using conventional spring steels. These improvements can be attributed to a reduced carbon content, and a fine prior austenite grain size and microalloy carbonitride dispersion developed through proper thermomechanical processing. Details of the steel composition, processing, tensile properties, fatigue strength, and fracture toughness will be presented.
Development of a microalloyed steel for automotive suspension springs
Entwicklung eines mikrolegierten Stahles für Fahrzeugtragfedern
1995
14 Seiten, 20 Bilder, 3 Tabellen, 13 Quellen
Aufsatz (Konferenz)
Englisch
Hot-coiling automotive suspension springs
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