Microstructure evolution and mechanical properties of 1 000 MPa cold rolled dual-phase steel
The microstructure evolution of 1 000 MPa cold rolled dual-phase (DP) steel at the initial heating stages of the continuous annealing process was analyzed. The effects of different overaging temperatures on the microstructures and mechanical properties of 1 000 MPa cold rolled DP steel were investigated using a Gleeble-3500 thermal/mechanical simulator. The experimental results show that ferrite recovery and recrystallization, pearlite dissolution and austenite nucleation and growth take place in the annealing process of ultra-high strength cold rolled DP steel. When being annealed at 800 ℃ for 80 s, the tensile strength and total elongation of DP steel can reach 1 150 MPa and 13%, respectively. The microstructure of DP steel mainly consists of a mixture of ferrite and martensite. The steel exhibits low yield strength and continuous yielding which is commonly attributed to mobile dislocations introduced during cooling process from the intercritical annealing temperature.
cold rolled dual-phase steel microstructure evolution recrystallization mechanical property overaging temperature
ZHAO Zheng-zhi JIN Guang-can NIU Feng TANG Di ZHAO Ai-min
Engineering Research Institute, University of Science and Technology Beijing, Beijing 100083, China Engineering Research Institute, University of Science and Technology Beijing, Beijing 100083,China
国际会议
2009 Frontier Symposium of China Postductors on Materrials Science(2009年中国博士后材料科学前言论坛)
长沙
英文
563-568
2009-11-22（万方平台首次上网日期，不代表论文的发表时间）