J Mater Sci Technol ›› 1992, Vol. 8 ›› Issue (4): 249-254.

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Fatigue Crack Propagation in Plain Carbon Dual-phase Steel

LEI Tingquan LIN Guangyong ** Dept.of Metals and Technology,Harbin Institute of Technology,Harbin,150006,China+ To whom correspondence should be addressed   

  • Received:1992-07-28 Revised:1992-07-28 Online:1992-07-28 Published:2009-10-10

Abstract: The effect of volume fraction V_M and carbon content(%C)_M of martensite was studied on the fa- tigue crack propagation behaviour of plain carbon martensite plus ferrite M+F dual-phase steel.The experimental results show that the △K_(th)decreases and da/dn increases with increasing V_M and (%C)_M at a load ratio R=0.05.High△K_(th)values are obtained by obvious crack closing ability caused by high roughness of the fractured surfaces.

Key words: fatigue crack propagation, dualphase steels, volume fraction of V_m