780MPa级冷轧双相钢的组织与性能研究  

Microstructure and properties of 780 MPa grade cold rolled dual-phase steel

作　　者：李国彬[1,2] 赵征志[1] 罗青[1] 唐荻[1,2] 赵爱民[1] 

机构地区：[1]北京科技大学冶金工程研究院,北京100083 [2]北京科技大学材料科学与工程学院,北京100083

出　　处：《金属热处理》2009年第9期11-14,共4页Heat Treatment of Metals

基　　金：国家"十一五"科技支撑计划(2006BAE03A06);北京市科技计划(D07010300700701)

摘　　要：在实验室试制了780MPa级冷轧双相钢,介绍了其成分设计、轧制工艺和连续退火工艺。研究了过时效温度对钢板力学性能和显微组织的影响,并利用扫描电镜和透射电镜对钢的显微组织进行了分析。结果表明,试制的冷轧双相钢经820℃保温,320℃过时效处理,可以获得综合力学性能优良的冷轧双相钢,其屈服强度为408MPa,抗拉强度为812MPa,伸长率达到了23.1%。Cold rolled dual-phase steels of 780 MPa grade were trial-produced in laboratory. The chemical composition design,rolling technology and continuous annealing process of the cold rolled dual-phase steels were introduced. The effect of over-ageing temperature on the mechanical properties and microstructure was studied. The microstructure after eontinuous annealing was analyzed using SEM and transmission electron microscopy. The results indicate that the dual-phase steels which have good meehanical properties can be obtained by annealing at 820 ℃, overageing at 320 ℃. After heat treatment,the yield strength is 408 MPa,the tensile strength is 812 MPa and the elongation reaches 23.1%.

关 键 词：冷轧双相钢 过时效 连续退火 显微组织 

分 类 号：TG142.2[一般工业技术—材料科学与工程]