There are an increasingly use of microalloyed forging steels for the production of automotive components for the purpose of higher productivity and thus cost saving compared with quenched and tempered (QT) steels. The microstructure of this kind of microalloyed forging steels is usually composed of coarse ferrite-pearlite in as-forged condition, whose tensile properties and toughness are often inferior to those of QT steels. Therefore, extensive efforts have been done to increase these properties especially toughness (1-4). However, most automotive components made of microalloyed forging steels experience cyclic loading in service. Therefore, attention should also be given to the fatigue properties of microalloyed forging steels (5-10). In this paper, the fatigue properties of three microalloyed forging steels (22MnVS, 38MnVS and 48MnV) with different carbon and vanadium content and one QT medium carbon steel 40Cr for comparison were measured by rotating bending fatigue test. Fatigue crack initiation mechanism was also investigated.
Evalution of fatigue properties of microalloyed forging steels
Entwicklung der Ermüdungseigenschaften bei den mikrolegierten Schmiedestählen
2006
9 Seiten, 9 Bilder, 5 Tabellen, 14 Quellen
Conference paper
English
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