Dynamic Tensile Fracture Characteristics of Ultra-High Strength Cold-Rolled Dual Phase Steels under High Strain Rate Deformation

摘要：

　　In this paper,ultra-high strength cold-rolled ferrite/martensite dual-phase steels (DP1180) were obtained through performing the experiment with Gleeble-3500.Moreover,fracture mechanisms of dual phase steel DP1180 under high strain rate deformation were investigated by SEM and TEM.The results of the study show that the center of fractograph of both quasi-static and dynamic fraction exhibited typical ductile dimple fracture pattern; that there was a slight adiabatic shear phenomenon at edge fracture of DP1180 steel under the condition of high strain rate; and that martensite lath at quasi-static tensile fracture of DP1180 steel becomes slender and its dislocation density massively increases,while martensite lath at dynamic tensile fracture of DP1180 steel happen brittle rupture,and a large number of dislocations gather in the cracks.

关键词： Cold-rolled dual phase steel High strain rate deformation Fracture behavior Split Hopkinson tensile bar (SHTB)

作者: Dai Qifeng Song Renbo Cai Hengjun Yu Sanchuan Gao Zhe

作者单位: School of Materials Science and Engineering,University of Science and Technology Beijing,Beijing,100 School of Materials Science and Engineering,University of Science and Technology Beijing,Beijing,100

会议类型: 国际会议

会议名称: The 2nd International Symposium on Automobile Steel (第二届汽车用钢生产及应用技术国际研讨会)

会议地点: 鞍山

会议语种:英文

页码: 82-85

在线出版日期: 2013-05-21（万方平台首次上网日期，不代表论文的发表时间）