Effect of Strain Rate on Dynamic Deformation Behavior of Dual Phase DP780 Steel
Tensile properties of a dual phase DP780 steel was studied using dynamic tensile testing machine under a variety of strain rates (1~1000 s-1) at ambient temperature.The deformation and fracture behaviors were also investigated using SEM and TEM.The results indicate that DP780 has significant strain rate sensitivity when strain rates are between 1 s-1 and 1000 s-1.The yield strength and ultimate tensile strength of DP780 increase gradually with increasing tensile strain rates.It can be seen big and small dimples are on the fracture surfaces of DP780 under different strain rates,which reveal that the dynamic fracture mechanism of DP780 is also micro-voids aggregation and growth.Furthermore,with increasing strain rates,the dimples size decreases slightly.TEM images near the fracture surface show dislocations piled up at the interface of ferrite and martensite,which will finally result in micro-voids formation.
strain rate deformation behavior dual phase steel DP780
LIU Huasai KUANG Shuang HAN Yun XIE Chunqian TENG Huaxiang
Shougang Research institute of Technology, Shougang Group, Beijing 100043, China;Beijing key Laboratory of Green Recyclable Process for Iron & Steel Production Technology,Beijing 100043, China
国际会议
成都
英文
387-390
2016-11-16（万方平台首次上网日期，不代表论文的发表时间）