Fatigue Crack Propagation in Plain Carbon Dual-phase Steel

摘要

The effect of volume fraction VM and carboncontent（%C）M of martensite was studied on the fa-tigue crack propagation behaviour of plain carbonmartensite plus ferrite M+F dual-phase steel.Theexperimental results show that the △Kthdecreasesand da/dn increases with increasing VM and（%C）M at a load ratio R=0.05.High△Kthvaluesare obtained by obvious crack closing ability causedby high roughness of the fractured surfaces.