两相区退火温度对高强冷轧DP980显微组织力学性能和断裂行为的影响  

Effect of Intercritical Annealing Temperature on Microstructure,Mechanical Properties and Fracture Behavior of High Strength Cold Rolled DP980

作　　者：毛博[1] 储双杰[2] 张理扬[2] 孙宝德[1] 

机构地区：[1]上海交通大学材料科学与工程学院,上海200240 [2]宝山钢铁股份有限公司,上海200941

出　　处：《热加工工艺》2014年第20期157-160,163,共5页Hot Working Technology

基　　金：国家自然科学基金资助项目(51204110);上海市科学技术委员会科研计划资助项目(11521100703)

摘　　要：研究了两相区退火温度对高强冷轧DP 980显微组织和力学性能的影响,并通过断口形貌分析以及拉伸前后的照片对比,分析了高强冷轧DP 980变形和断裂特性。结果表明,两相区退火温度通过影响双相钢中马氏体的碳含量、马氏体和铁素体的晶粒尺寸来影响其力学性能。实验所获得双相钢均为微孔聚集型的韧性断裂。The effects of intercritical annealing temperature on microstructure and mechanical properties of high strength dual phase 980 were systematically investigated. The microstructure before and after tensile tests as well as the fractography were also analyzed to reveal the deformation and fracture behavior of the cold rolled DP980. The results show that the mechanical properties of the steel are affected by the martensite volume fraction, grain size ofmartensite and ferrite which are determined by the intercritical annealing temperature. The fracture mechanism of the steels obtained are ductile fracture with void coalescence.

关 键 词：DP 980 两相区退火温度 力学性能 断裂机制 

分 类 号：TG142.1[一般工业技术—材料科学与工程]