Study on the Effect of Pre-strain on Fatigue Properties of Dual-phase Steel

Abstract The uniaxial tensile test investigated the fatigue performance of DP780 steel without pre-strain and with 5% 10% pre-strain. Topography fractured surfaces was observed to study relationship between performance. results showed that specimens would affect steel. It cause an increase in life when stress comparatively high less than 100,000 cycles. However, reduced level low, more Pre-strain strength samples. Fatigue were 318 MPa, 310 303 respectively. sample fracture a brittle 5%, while it ductile 10%.