Microstructure evolution and mechanical properties of 1000 MPa cold rolled dual-phase steel  

作　　者：赵征志 金光灿 牛枫 唐荻 赵爱民 

机构地区：[1]Engineering Research Institute,University of Science and Technology Beijing

出　　处：《中国有色金属学会会刊：英文版》2009年第S3期563-568,共6页Transactions of Nonferrous Metals Society of China

基　　金：Project(2006BAE03A06) supported by the National Key Technology R&D Program during the 11th Five-Year Plan Period

摘　　要：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.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.

关 键 词：COLD ROLLED DUAL-PHASE steel microstructure evolution RECRYSTALLIZATION MECHANICAL property overaging temperature 

分 类 号：TG142.1[一般工业技术—材料科学与工程]